ITEM
611 pipe culverts, sewers, drains,
and drainage structures
611.01
Description
611.02
Materials
611.03
Definitions
611.04
Submittals
611.05
Excavation
611.06 Bedding
and Backfill
611.07 Laying
Conduit
611.08 Joining
Conduit
611.09 Exterior
Coatings and Membrane Waterproofing
611.10 Drainage
Structure Construction
611.11 Field
Paving of New or Existing Conduit
611.12
Performance Inspection
611.13 Conduit
Evaluation
611.14 Drainage
Structure Evaluation
611.15 Surface
Settlements
611.16 Method
of Measurement
611.17 Basis of
Payment
611.01 Description. This work consists of constructing
conduits, and constructing and reconstructing drainage structures. This
work also includes preparing installation plans, performing inspections, and
providing reports and other required documentation.
611.02 Materials. Furnish pipe of the specified conduit
type and size or one size larger with the approval of the Engineer.
Conduit shown in the plans is designed for hydraulic capacity and durability
only. Furnish conduit that meets the performance requirements of this
specification and meets the durability and hydraulic capacity specified in the
plans. If the material is not specified in the plans, furnish conduit
conforming to any of the material requirements listed for that conduit
type. All listed materials for each conduit type can meet the performance
requirements. However, different materials may require varying
installation procedures.
The
Contractor may furnish concrete or plastic pipe of the same type with greater
strength than specified. The Contractor may furnish metal pipe with a
greater thickness than specified, so long as the pipe has the same corrugation
profile and is the same type.
Non-reinforced concrete
pipe, Class 3.................... 706.01
Reinforced concrete
circular pipe............................. 706.02
Reinforced concrete pipe,
epoxy coated.................. 706.03
Reinforced concrete
elliptical pipe............................ 706.04
Precast reinforced
concrete box sections.................. 706.05
Precast reinforced
concrete 3-sided flat topped culverts 706.051
Precast reinforced
concrete arch sections.............. 706.052
Precast reinforced
concrete round sections............ 706.053
Vitrified clay pipe (extra
strength only)................... 706.08
Corrugated steel conduits........................
707.01 or 707.02
Structural plate
corrugated steel structures............... 707.03
Precoated, galvanized steel culverts......................... 707.04
Bituminous coated corrugated steel pipe and pipe
arches
with paved invert................................ 707.05 or 707.07
Corrugated aluminum alloy
pipe.............. 707.21 or 707.22
Aluminum alloy structural
plate conduits................. 707.23
Corrugated steel box
culverts................................... 707.15
Corrugated aluminum box
culverts.......................... 707.25
Corrugated polyethylene smooth lined pipe
....................................... 707.33
with a welded bell inlet
Steel reinforced thermoplastic ribbed pipe
...................................... SS
938 with a welded bell inlet
B. Type B Conduit – Storm or sanitary
sewers under pavement
Non-reinforced concrete
pipe, Class 3..................... 706.01
Reinforced concrete
circular pipe............................. 706.02
Reinforced concrete
elliptical pipe............................ 706.04
Precast reinforced
concrete box sections.................. 706.05
Vitrified clay pipe (extra
strength only)................... 706.08
Mortar lined corrugated
steel pipe............................ 707.11
Corrugated steel spiral
rib pipe................................ 707.12
Bituminous lined
corrugated steel pipe.... 707.13 or 707.14
Corrugated aluminum spiral
rib pipe........................ 707.24
Corrugated polyethylene
smooth lined pipe............. 707.33
Polyvinyl chloride
corrugated smooth interior pipe. 707.42
Polyvinyl chloride profile
wall pipe......................... 707.43
Polyvinyl chloride solid
wall pipe............................ 707.45
Polyvinyl chloride drain
waste and vent pipe........... 707.46
Polyvinyl chloride ABS
composite pipe.................. 707.47
Polyvinyl chloride large-diameter
solid wall pipe…707.48
ABS drain waste and vent
pipe................................ 707.51
ABS sewer
pipe....................................................... 707.52
Polypropylene corrugated
double wall pipe............. 707.65
Polypropylene triple wall
pipe................................. 707.69
Steel reinforced
thermoplastic ribbed pipe............... SS
938
Ductile iron pipe
(sanitary)...................................... 748.01
Polyvinyl chloride pipe
(sanitary)............................ 748.02
C. Type C Conduit –
Storm or sanitary sewers not under pavement
Non-reinforced concrete circular
pipe...................... 706.01
Reinforced concrete
pipe.......................................... 706.02
Reinforced concrete
elliptical pipe............................ 706.04
Precast reinforced
concrete box sections.................. 706.05
Vitrified clay
pipe.................................................... 706.08
Mortar lined corrugated
steel pipe............................ 707.11
Corrugated steel spiral
rib pipe................................ 707.12
Bituminous lined
corrugated steel pipe.... 707.13 or 707.14
Corrugated aluminum spiral
rib pipe........................ 707.24
Corrugated polyethylene
smooth lined pipe............. 707.33
Polyvinyl chloride
corrugated smooth interior pipe. 707.42
Polyvinyl chloride profile
wall pipe......................... 707.43
Polyvinyl chloride solid
wall pipe............................ 707.45
Polyvinyl chloride drain
waste and vent pipe........... 707.46
Polyvinyl chloride ABS
composite pipe.................. 707.47
Polyvinyl chloride
large-diameter solid wall pipe…707.48
ABS drain waste and vent
pipe................................ 707.51
ABS sewer
pipe....................................................... 707.52
Polypropylene corrugated
double wall pipe............. 707.65
Polypropylene triple wall pipe.................................
707.69
Steel reinforced
thermoplastic ribbed pipe............... SS
938
Ductile iron pipe
(sanitary)...................................... 748.01
Polyvinyl chloride pipe
(sanitary)............................ 748.02
D. Type D Conduit – Drive pipes and
bikeways
Non-reinforced concrete
pipe, Class 3..................... 706.01
Reinforced concrete
circular pipe............................. 706.02
Reinforced concrete
elliptical pipe............................ 706.04
Vitrified clay pipe (extra
strength only)................... 706.08
Corrugated steel
conduits........................ 707.01
or 707.02
Structural plate
corrugated steel structures............... 707.03
Corrugated aluminum alloy
pipe.............. 707.21 or 707.22
Aluminum alloy structural
plate conduits................. 707.23
Corrugated polyethylene
smooth lined pipe............. 707.33
Polyvinyl chloride
corrugated smooth interior pipe. 707.42
Polyvinyl chloride profile
wall pipe......................... 707.43
Polyvinyl chloride solid
wall pipe............................ 707.45
Polyvinyl chloride
large-diameter solid wall pipe…707.48
Polypropylene corrugated
single wall pipe.............. 707.62
E. Type E Conduit – Miscellaneous small
drain connections and headers
Non-reinforced concrete
pipe................................... 706.01
Reinforced concrete circular
pipe............................. 706.02
Reinforced concrete
elliptical pipe............................ 706.04
Concrete drain tile, extra
quality............................... 706.07
Vitrified clay
pipe.................................................... 706.08
Clay drain title, extra
quality.................................... 706.09
Corrugated steel
conduit.......................... 707.01 or 707.02
Corrugated aluminum alloy
pipe.............. 707.21 or 707.22
Corrugated polyethylene drainage
pipe.................... 707.32
Corrugated polyethylene
smooth lined pipe............. 707.33
Smooth-wall polyvinyl chloride underdrain
pipe
(non-perforated).................................................. 707.41
Polyvinyl chloride
corrugated smooth interior pipe. 707.42
Polyvinyl chloride profile
wall pipe......................... 707.43
Polyvinyl chloride solid
wall pipe............................ 707.45
Polyvinyl chloride drain
waste and vent pipe........... 707.46
Polyvinyl chloride ABS composite
pipe.................. 707.47
Polyvinyl chloride
large-diameter solid wall pipe…707.48
ABS drain waste and vent
pipe................................ 707.51
ABS sewer
pipe....................................................... 707.52
F. Type F Conduit – Conduit on steep
slopes; underdrain outlets
Corrugated steel conduits
(steep slope conduit).............. 707.05
Type C or 707.07
Corrugated aluminum alloy pipe
(steep slope conduit)........................... 707.21 or 707.22
Corrugated polyethylene
smooth lined pipe (underdrain
outlets)................ 707.33
Smooth-wall polyvinyl chloride underdrain
pipe (non-perforated underdrain outlets) 707.41
Polyvinyl chloride corrugated
smooth interior pipe (underdrain outlets)............
707.42
Polyvinyl chloride solid
wall pipe (underdrain outlets) 707.45
G. For constructing or reconstructing
drainage structures, furnish materials conforming to:
Concrete, Class
QC1............................................. 511,
499
Brick and masonry
units.............................................. 704
Precast reinforced concrete manhole, catch basin,
and inlet sections................................................. 706.13
Precast reinforced
concrete outlet............................. 706.15
Preformed expansion joint
filler............................... 705.03
Epoxy coated reinforcing
steel................................. 709.00
Cast frames, grates, and
covers. 711.12, 711.13, or 711.14
Welded frames and
grates..................... 711.01 and 513.17
Steps..........................................
711.13, 711.30,
or 711.31
Resilient and flexible
gasket joints........................... 706.11
Curing
materials.......................................... 705.05, 705.07
Curing membrane for
inlets............. 705.07, Type 1 or 1-D
Mortar...........................................................................
602
Nonshrink mortar….................................... ………705.22
H. For bedding and backfill, furnish materials
conforming to:
Structural
backfill..................................................... 703.11
Coarse
aggregate..................................... 703.02
or 703.13
Fine
aggregate.............. 703.02, 703.03, 703.04,
or 703.05
Embankment.....................
703.16A, 703.16B, or 703.16C
Aggregate................................................................
703.17
Low Strength Mortar
Backfill (LSM)........................... 613
I. For concrete collars and
encasement, furnish materials conforming to:
Concrete, Class
QC1............................................ 511,
499
Reinforcing steel ..................................................... 509.02
J. For field paving of conduit
inverts, furnish materials conforming to:
Concrete, Class
QC1............................................ 511,
499
Coarse aggregate, size No.
7, 8, or 78..................... 703.02
Galvanized welded wire
fabric................................. 709.08
For
material in items not specified above, furnish materials conforming to:
Mortar...........................................................................
602
Nonshrink mortar....................................................
705.22
Bituminous pipe joint
filler...................................... 706.10
Resilient and flexible
gasket joints for:
.... Concrete
pipe...................................................... 706.11
.... Vitrified clay
pipe................................................ 706.12
Preformed flexible joint
sealant................................ 706.14
Type 2 membrane
waterproofing............................. 711.25
Type 3 membrane
waterproofing............................. 711.29
Geotextile
Fabric........................................ 712.09,
Type A
Joint
wrap...................................... ASTM C 877, Type III
Buried liner waterproofing
membrane..................... 711.22
For
Class QC1 concrete, provide batch plant tickets according to 499.07.
If
a precast reinforced concrete box culvert (706.05)
is specified, the Engineer may allow the Contractor to substitute either a
precast reinforced concrete 3-sided flat topped culvert, a precast reinforced
concrete arch culvert, or a precast reinforced concrete round section (706.051, 706.052,
or 706.053). If a 706.051, 706.052,
or 706.053 is
specified, the Engineer may allow the Contractor to substitute one for the
other. Refer to 611.04 for submittal
requirements.
If
bituminous coated corrugated steel pipe or pipe arch with paved invert (707.05 or 707.07)
is specified, the Contractor may furnish conduit with a coating conforming to 707.04.
611.03 Definitions. The following terms, when used in this
specification, are defined as follows:
Backfill. Material used
to fill the trench or excavation, not including the bedding material.
Bed. The bottom of the trench or excavation.
Bedding Material. Material placed
above the bed and below the conduit or drainage structure. It is placed
or shaped to fit the bell and spigot and typically placed or shaped to fit the
conduit. The bedding material may also extend up and around the sides of
the conduit or drainage structure.
Conduit. Includes pipe, culverts, sewers, and drains. Conduits
are classified as Type A, B C, D, E, and F.
Corrugated Metal Conduit. Includes all
conduit made from corrugated steel or corrugated aluminum. Either
material may also have coatings. This includes all of the following types
of materials: 707.01, 707.02, 707.03,
707.04, 707.05,
707.07, 707.11,
707.12, 707.13,
707.14, 707.15,
707.17, 707.21,
707.22, 707.23,
707.24, and 707.25.
Cut. A situation where the top of the conduit is below the existing
ground surface or where a proposed embankment is constructed at least 2 feet
(0.6 m) above the top of the conduit before installation.
Deflection.Racking,
flattening or ovalization of the pipe’s
cross-section.
Drainage Structures. Manholes, catch basins, inlets, inspection wells, junction
chambers, and precast reinforced concrete outlets.
Fill. A situation where the top of the conduit is above the existing
ground surface in an area where an embankment will be constructed.
Flexible Conduit. Plastic,
corrugated metal, ductile iron (748.01), or steel casing pipe (748.06).
Infiltration. Water or other
material that enters the conduit or drainage structure through the joints or
conduit connections in excess of the limits for soil tightness or for the type
of joint specified.
Lay
Length.
The length of a standard section of pipe as normally supplied
by the manufacturer.
Plastic Conduit. Corrugated polyethylene, polyvinyl chloride, or ABS conduit.
This includes all of the following types of materials: 707.31, 707.32,
707.33, 707.41,
707.42, 707.43,
707.44, 707.45,
707.46, 707.47,
707.51, 707.52,
707.62, 707.65,
707.69, SS
938, and 748.02.
Rigid Conduit. Concrete pipe,
vitrified clay pipe, or clay drain tile. This includes all of the
following types of materials: 706.01, 706.02, 706.03,
706.04, 706.05,
706.051, 706.052, 706.053,
706.08, and 706.09.
Run
of Conduit.
The conduit placed between drainage structures, between a drainage structure
and an open outlet, between an open inlet and a drainage structure, or between
the open inlet and open outlet.
Span. Span is
the conduit opening measured along the centerline of the roadway.
Multiple cell openings are considered one span if the clear distance between
the openings is less than half of the smaller contiguous opening.
Spring Line. A line along the length of the pipe at its maximum span.
For circular pipes the spring line is located at mid-height of the pipe (rise
divided by two).
A. Shop Drawings. Prepare shop drawings and calculations when required
below. Have a Registered Engineer prepare, sign, seal and date all
calculations. Have another Registered Engineer check all drawings and
calculations, sign, and seal and date all calculations. Submit load
rating calculations to the Office
of Structural Engineering for all structures with a 10 foot span and
greater in accordance to the most current version of ODOT’s
Bridge Design
Manual. Submit two copies of the shop drawings and calculations to
the Engineer. The Engineer will submit one copy to Central Office
according to the following:
1.
If Reinforced Concrete Circular Pipe, 706.02,
requires a “Special Design” with a specified D-load requirement above the
minimum D-load, submit shop drawings and design calculations. Design the pipe
to meet the D-load requirements required to meet the performance of this
specification. Include the following information in the submittal: all
structural design and loading information, all material specifications, all
dimensions, and the installation plan. Submit to the Office
of Structural Engineering.
2.
Precast reinforced concrete 3-sided flat topped culverts, precast reinforced
concrete arch culverts, or precast reinforced concrete round sections, (706.051, 706.052,
or 706.053) must submit structural
analysis methods, structural design criteria and calculations, structure
details, and shop drawings. Include details for a precast slab bottom if
required. Submit to the Office
of Structural Engineering.
3.
Submit hydraulic calculations if requesting approval to substitute a precast
reinforced concrete 3-sided flat topped culvert (706.051), a reinforced concrete arch
culvert (706.052), or a precast
reinforced concrete round section (706.053)
for one another. The proposed culvert must meet or exceed the same
hydraulic requirements as the specified culvert and minimum cover
requirements. If the specified culvert is on pedestal walls, include the
shop drawings for the pedestal wall design in the submittal because 3-sided
flat topped culverts, arch culverts, and round sections require different
pedestal wall designs. Submit to the structural design calculations to the Office
of Structural Engineering and hydraulic calculations to the Office
of Hydraulic Engineering.
4.
Submit hydraulic calculations if requesting approval to substitute either a
precast reinforced concrete 3-sided flat topped culvert, a precast reinforced
concrete arch culvert, or a precast reinforced concrete round section (706.051, 706.052,
or 706.053) placed on a precast or
cast-in-place slab bottom for a precast reinforced concrete box culvert (706.05). The proposed culvert must
meet the same hydraulic requirements as the specified box culvert and minimum
cover requirements. The Department may allow the bottom slab to be
cast-in-place but will not issue a time extension for any delays resulting from
the use of a cast-in-place bottom slab. Submit to the Office
of Hydraulic Engineering.
B. Installation Plan. Submit a written installation plan to the Engineer
for installing all conduit and drainage structures for review and acceptance.
Submit the
installation plan at least 15 days before any conduit or drainage structure
work begins. Do not perform work without an accepted installation
plan. Include the following required information for each conduit type
and size, and type of drainage structure:
1. Trench and excavation cross-sections
with dimensions.
2.
Locations where the conduit is installed in a cut situation and where it is installed
in a fill situation.
3.
Type of bedding and backfill material used and maximum lift thickness.
4.
Compaction density requirements for bedding and backfill and compaction
equipment.
5.
Identify the starting location (outlet or inlet) for each run of conduit. All conduit must be laid from the outlet to the inlet unless
approved by the Engineer. Bell or groove-end Type A conduit must have a
bell or groove-end at the inlet.
6.
Maximum allowable joint gap between conduit sections.
7.
Other installation details as necessary.
8.
Provide written confirmation from the conduit manufacturer that the pipe
material and strength supplied are appropriate for the material and density
requirements described in the installation plan for the backfill and bedding as
well as the height of cover. Ensure the pipe material meets the durability
design specified in the plans. This confirmation by the conduit
manufacturer will not relieve the Contractor of the responsibility for
obtaining the required results.
Deviations from the
installation plan during construction require a revision of the installation
plan. Resubmit all revisions to the installation plan to the Engineer
within 5 days of the change with the conduit manufacturer’s written confirmation
that the pipe material and strength supplied are appropriate for the material
and density requirements described in the newly revised installation plan for
the backfill and bedding. If the conduit manufacturer does not provide
this written confirmation to the newly revised installation plan, all the
conduit installed according to the unconfirmed plan must be replaced. No
new installation plans will be considered until all previous installation plans
have been confirmed and accepted.
Provide the conduit
manufacturer's structural calculations when specified or within 10 days when
requested by the Engineer.
For structural plate
and metal pipe arch conduit with a span of 57 inches (1440 mm) or larger,
ensure the manufacturer provides match-marked ends on the conduit.
Include a layout drawing in the installation plan.
For metal conduit
with two structural plate thicknesses specified, identify the location of the
thicker plates. For precast concrete 3-sided flat and arch topped
structures (706.051 and 706.052) provide a 3 inch (75 mm) deep
keyway centered on the leg and at least 6 inches (150 mm) wider than the
thickness of the leg at the bottom. For precast concrete round sections (706.053) provide an 8-inch (200 mm) deep
keyway for spans up to 24 feet (7.3 m) and a 10-inch (254 mm) deep keyway for
spans greater than 24 feet, (7.3 m). Center the keyway on the precast
arch base. The width of the keyway must be 8 inches (200 mm) greater than
the thickness of the precast arch base. For non-vertical leg arches set
on pedestal walls, a one sided keyway is acceptable if the required pedestal
wall design thickness is not sufficient for a full keyway.
The Contractor may
choose to jack or tunnel any conduit with written approval from the Office
of Hydraulic Engineering. Submit a written request to the Office
of Hydraulic Engineering and allow at least 28 days for review.
C. Construction Inspection Forms. Perform work only in the presence of the
Contractor’s representative doing the inspection. Submit construction
inspection forms to the Engineer for each run of
conduit and each drainage structure. Use construction inspection form CA-P-1
for conduit and use construction inspection form CA-P-3
for drainage structures. Ensure that all deviations from the
installation plan are noted on the construction inspection form. Ensure
that the information on the construction inspection form is complete and
accurate and that the form is signed by a representative of the Contractor
certifying that the information on the form is accurate. The Contractor’s
representative must make the following statement on the form:
“I certify that the
information on this form is accurate and all deviations from the current
installation plan have been noted.”
Submit each day’s
construction inspection forms before the start of the next work day. If
the Engineer gives notice that the information on the form is incomplete or not
accurate, do not continue related work until complete and accurate forms are
submitted and accepted by the Engineer.
Construction
inspection forms CA-P-1
and CA-P-3
require trench and bedding measurement checks to be taken every 50 feet with a
minimum of two per run. Record measurements to the
nearest 0.1 foot (30 mm). If these measurements are not taken, do
not continue related work until the Contractor submits a plan in writing to the
Engineer for approval that explains how these measurements will be determined.
D. Performance Report. Provide a performance report for each
performance inspection, and provide separate reports for each change in conduit
size or change in material type. Include the following in each
performance report:
A.
Project number and County-Route-Section
B.
Date of performance inspection
C.
Type and size of conduit
D.
Conduit diameter report from the Manufacturer
E.
Time of video recording
F.
Location (e.g. station and offset) and viewing direction. For Type A and
B conduit, include the latitude and longitude of the conduit at the location
where the culvert centerline and the roadway centerline intersect. Ensure the
units are in decimal degrees to the sixth decimal place. Use a Global
Navigation Satellite System (GNSS) unit that is
accurate to within 15 feet (4.5 meters).
G.
Summary of all defects including type, measurement, and location
H.
For remote inspections using a mandrel, indicate in the performance report, the
size of the mandrel and how it was calculated. Document all locations
where the mandrel was unable to advance through the conduit.
I.
For remote inspections using a crawler mounted camera with laser profiler,
include:
1.
Three dimensional model of the conduit based on the laser profile measurements.
2.
Digital profile of conduit extracted from the inspection video
3.
Calculations of the ovality, capacity and delta of
the conduit
4.
Explanation as to why data was unattainable for any section of the conduit
Submit a performance
report to the Engineer within 5 days of completing the performance inspection
of the conduit run or drainage structure. Submit the performance report in a
digital format that allows the Department to make additional copies.
Submit the results of the performance survey at the same time as the
performance report or earlier.
611.05 Excavation. Excavate as described in the
installation plan. Record any deviations from the installation plan on
the construction inspection forms and revise the installation plan.
Excavate
trenches along the centerline of the conduit. When
installing conduit in a fill situation, construct the embankment to the
elevation of the spring line for the conduit or higher before excavating the
trench.
Provide
a firm bed for the full width and length of the trench. If bedding material is
not provided, loosen the middle third of the bed to seat the conduit.
Provide a firm bed beneath the drainage structure.
Remove
any unsuitable material exposed in the bed for the width of the trench and a
depth of at least 6 inches (150 mm). Replace the unsuitable material
with structural backfill, Type 1 or 2. Remove any rock or shale exposed
in the bed to a depth of at least 6 inches (150 mm). Replace the rock or
shale with structural backfill, Type 1 or 2. The Department will pay for
this work according to 109.05, unless
otherwise noted in the Contract Documents. If the Engineer changes the flow
line by more than one foot (0.3 m), the Department will pay according to 109.05, unless otherwise noted in the
Contract Documents.
611.06 Bedding and Backfill. Place and
compact bedding and backfill as described in the installation plan.
Record any deviations from the installation plan on the construction inspection
forms and revise the installation plan.
If
using coarse aggregate material for bedding and backfill below the ground water
elevation, wrap the coarse aggregate with Type A
geotextile fabric. Shape the bedding with recesses to receive the bell of
bell-and-spigot conduit. Loosen the bedding in the middle third to seat
the conduit. If using LSM for bedding, also use
LSM for backfill to at least 6 inches (150 mm) over
the top of the conduit. Install bedding and backfill for Type F conduits
for underdrain outlets according to 605.03.C.
Ensure
compaction density complies with the installation plan by performing compaction
testing according to Supplement 1015
and the manufacturer’s recommendation. If Structural Backfill Type 3
or open graded material is used, vibrate, tamp or compact to the compaction
level required by the manufacturer in the installation plan.
611.07 Laying Conduit. Maintain flows and drainage at
all times until the new facilities are completed and in service. Any
temporary diversion of flows and drainage is the responsibility of the
Contractor. Maintain flows and drainage or provide temporary diversion at
no additional cost to the Department.
Visually
inspect all conduit in the presence of the Engineer
before it is placed in the trench. Replace all conduit
that is damaged as determined by the Engineer. Before installation,
measure and record on the CA-P-1
the widest inside dimension of each lay length of conduit. This
measurement is to be taken three times along each run of conduit. For corrugated metal conduit measure to the inside peak of the
corrugations.
Lay
the conduit in the center of the trench at the invert elevation shown on the
plans. Any deviation must be approved by the Engineer. If the Engineer
does not approve the deviation, stop all related work until the conduit is relaid. Ensure that the conduit is in contact with the
bedding for its full length and maintain the line and grade of the
conduit. The Contractor’s representative doing the inspection will
visually inspect all conduit before placing any
backfill. Rejoin, re-lay, or replace conduits that have settled, or that are
damaged.
Lay
all conduits as described in the installation plan and according to the
following requirements. The installation plan cannot change the following
requirements. Meeting these requirements does not relieve the Contractor
of the responsibility for obtaining the required results. Record any
deviations from the installation plan on the construction inspection forms and
revise the installation plan.
A.
If the welded seam in a metal conduit is longitudinal, place the seam at the
spring line.
B.
For all metal conduit, use only lifting devices that
do not require a hole through the material.
C.
Lay metal conduit so that match marks align.
D.
For all metal conduit that is cut at a drainage
structure or headwall, treat the cut end with the same coating as the
conduit. Do not treat any cuts within the run.
E.
Where two structural plate thicknesses are specified, place the thicker plates
according to the installation plan.
F.
Set precast reinforced concrete 3-sided flat topped culvert sections (706.051) in the keyway. Place the units in
a 1/2-inch (13 mm) bed of mortar. If proper line and grade of the
structure cannot be maintained on the bed of mortar, set the sections on 5 x
5-inch (125 x 125 mm) masonite
or steel shims. Fill the entire keyway joint with mortar.
G.
Set precast reinforced concrete arch sections (706.052) in the keyway. Place the
units on 5 x5-inch (125 x 125 mm) masonite
or steel shims to provide a minimum 1/2-inch (13 mm) gap between the footing
and the bottom of the leg. Fill the entire keyway joint with mortar.
H.
Set the precast reinforced concrete round sections (706.053) in the keyway. Place the
units on masonite or steel
shims to provide a minimum 1.5-inch (38 mm) gap between the footing and the
bottom of the precast arch base. Fill the entire keyway joint with
mortar. Provide 5000 psi. (34.5 MPa)
mortar. For arches that gain structural continuity by a
cast-in-place closure at the project site, provide concrete with the same
compressive strength as the precast arch.
I.
For precast reinforced concrete culverts (706.05,
706.051, 706.052, and 706.053) fill the lifting devices with
mortar. Cover the exterior of the lifting devices with joint-wrap
material if they are outside the limits of the membrane waterproofing.
Use joint-wrap with a minimum width of 9 inches (225 mm). Use only
lifting devices that do not require a hole through the structure.
J.
The inlet of all rigid conduit and plastic conduit used in a Type A application (open inlet) must have a bell. If field
cutting is necessary to furnish a bell at the inlet, locate the cut end at an
interior joint by removing part of a section within the run. Join the conduit
as described below and encase the joint with a concrete collar to ensure a
stable connection.
K.
The top and bottom of reinforced concrete pipe that has elliptical or quadrant
mat reinforcing will be clearly marked on the pipe. Handle and place this pipe
so that the markings remain in a vertical plane through the center of the
pipe.
L.
Handle and place reinforced concrete pipe with auxiliary reinforcements
(stirrups) with the centerline of the auxiliary reinforcement system (stirrups)
in a vertical plane through the center of the pipe.
M.
Fill all lifting holes in rigid conduit with concrete according to the
manufacturer’s recommendations or using a method approved by the Engineer.
N.
Immediately after placing conduit, construct the end treatments at both the
outlet and inlet ends. Show this activity as part of the conduit construction
on the progress schedule. These end treatments include headwalls, concrete
riprap, rock channel protection, sod or other erosion control items.
O.
When conduit is installed under pavement, perform the following immediately
after the completion of backfill placement and compaction: remove and dispose
of all surplus material according to 105.17,
clear the site, and replace all pavement necessary to
restore traffic. Show this activity as part of the conduit construction on the
progress schedule.
611.08 Joining Conduit. Ensure the joints are clean and
free from dirt or debris. Join the conduit sections as described below.
Visually inspect all conduit, joints, and gaskets in the presence of the
Engineer before placing any backfill. Rejoin, re-lay, or replace any
conduit that does not meet the requirements.
The
Engineer may allow joint materials other than those listed below, provided the
Contractor demonstrates the proposed material will result in durable, sealed
joints.
Join
conduit as described in the installation plan and according to the requirements
below. For conduit material not listed below, join conduit as recommended
by the manufacturer. Record any deviations from the installation plan on
the construction inspection forms and revise the installation plan.
A. Corrugated Metal
Conduit. Join corrugated metal
conduit, Types A, B, C, D, and F, using either coupling bands or bell and
spigot joints. Join the conduit according to the following requirements.
1.
Coupling bands. Furnish
coupling bands conforming to 707.01 or 707.02, and having the same coating as the
conduit being joined. Use either coupling bands with gaskets or wrap the
joints with Type A geotextile fabric.
2.
Bell and spigot joints. If
using bell and spigot joints, place a gasket in the
first corrugation of the spigot end and thoroughly lubricate the gasket and the
bell end of the receiving conduit before assembly. Drive the spigot securely
into the bell.
3.
For coorugated metal conduits with smooth steel interior liner, furnish a joint conforming to 707.18, 707.19
and 707.20.
B. Rigid Conduit.
Join rigid conduit, Types A, B, C, D, and F, according to the following
requirements.
1.
For all concrete pipe (706.01, 706.02, 706.04)
that is not epoxy coated and vitrified clay pipe (706.08), seal the joints using one of the
following methods:
a.
Fill the joint with bituminous pipe joint filler, providing a smooth transition
on the inside and a complete seal on the outside.
b.
Use preformed flexible joint sealant to seal the joint. Before installing
the joint sealant, prime both surfaces of the joint with asphalt based primer
according to the joint sealant manufacturer’s recommendations.
c.
Use resilient and flexible gasket joints. If the conduit is a sanitary
sewer pipe, test the joint for infiltration and exfiltration according to ASTM C 969 or ASTM C 1103. If any
joint does not meet the test requirements, make corrections until the joint
meets the test requirements.
2.
For epoxy coated concrete pipe (706.03),
seal the joint using fibrated coal tar joint compound
applied according to the conduit manufacturer’s recommendations.
3.
For precast reinforced concrete box culverts, precast reinforced concrete
3-sided flat topped culverts, precast reinforced concrete arch culverts, and
precast reinforced concrete round sections (706.05,
706.051, 706.052, and 706.053), place the sections according to
the installation plan. Clean the joint gap of all debris and apply one of
the following:
a.
For joints in precast reinforced concrete box culverts (706.05), fill the top exterior joint gap and
the bottom and side interior joint gap with mortar. Next, for any
exterior joint not covered by membrane waterproofing, cover the exterior joint
with a 9-inch (225 mm) wide strip of joint wrap in accordance with the
manufacturer’s recommendation. Center the joint wrap on the joint.
b.
For precast reinforced concrete 3-sided flat topped culverts (706.051), fill the top keyway joint with nonshrink mortar. If the side or leg joints are
tongue and groove types, fill the joints as described above for concrete box
culverts. If the side or leg joints are keyway types, fill with nonshrink mortar. Prepare, place, and cure the nonshrink mortar according to the nonshrink
mortar manufacturer’s recommendations. Wet all surfaces of the keyway
joint, but do not allow free standing water in the joint. Next, cover the
exterior joint with a 12-inch (300 mm) wide strip of joint wrap. Center
the joint wrap on the joint. Use a continuous length of joint wrap
sufficient to extend from the bottom of the vertical face on one side to the
bottom vertical face on the other side. Apply membrane waterproofing to
the precast sections after they are installed.
c.
For precast reinforced concrete arch culverts and precast reinforced concrete
round sections (706.052 and 706.053), install a 7/8 x 1 3/8-inch (24 x
34 mm) preformed flexible joint sealant (706.14)
along the outside joint chamfer. Use a continuous length of joint sealant
sufficient to extend from the bottom of the vertical face on one side to the
bottom vertical face on the other side. Before installing the joint
sealant, prime the joint chamfer with a primer according to the joint sealant
manufacturer’s recommendations. For 706.052
and 706.053, cover all exterior joints
with a 12-inch (300 mm) wide strip of joint wrap centered on the
joint. Use a continuous length of joint wrap sufficient to extend
from the bottom of the vertical face on one side of the structure to the bottom
vertical face on the other side. Next, apply all waterproofing as shown
on the plans. Apply membrane waterproofing to the precast sections after
they are installed.
d.
For precast reinforced concrete box culverts, precast reinforced concrete
3-sided flat topped culverts, precast reinforced concrete arch culverts, and
precast reinforced concrete round sections (706.05,
706.051, 706.052, and 706.053), apply an approved epoxy-urethane
sealer per the plans to all top surfaces not covered by membrane
waterproofing. Extend sealer 1 foot (0.3 m) below the backfill on all
sides of the culvert sections including the joint.
C. Plastic
Conduit. Join plastic
conduit, Types A, B, C, D, and F, using either coupling
bands, bell and spigot joints, or bell-bell couplers. Join the conduit
according to the following requirements.
1.
Coupling bands. Furnish coupling
bands of the same size as the conduit and that engage at least two full
corrugations on each conduit section. Furnish gasketed
coupling bands of the same material as the plastic conduit.
2.
Bell and spigot joints. If
using bell and spigot joints, drive the spigot securely into the bell.
For gasketed joints, ensure that the gasket is
properly seated after joining.
3.
Bell-bell couplers. If using bell-bell
couplers, drive the conduit securely into the coupler.
D. Type E Conduit.
Join Type E conduits with open joints by butting the ends and wrapping with a
minimum 4-inch (100 mm) wide tarred paper or tarred burlap. Place soil
around this material to hold it in place during backfilling.
611.09 Exterior Coatings and Membrane Waterproofing. Apply exterior
coatings and membrane waterproofing as specified below. Protect the
exterior coatings and membrane waterproofing from damage during placing of the
bedding, backfill, and embankment.
A. For concrete conduit, clean the
surfaces before placing the membrane waterproofing. Apply membrane
waterproofing as specified. Apply the membrane waterproofing to all surfaces
that will be in contact with the backfill (top and sides) according to the
membrane waterproofing manufacturer’s recommendation.
B. For structural plate metal structures
and corrugated metal box culverts (707.03,
707.15, 707.23,
and 707.25) with less than 8 feet of
cover, apply waterproofing by one of the following methods.
1.
Coat the exterior of the conduit above the limits of the bedding and within the
limits of backfill. Ensure that all plate seams and bolts are thoroughly
sealed. Furnish coating material and apply it according to AASHTO M 243. Allow asphalt mastic material to
dry 48 hours and tar base material to dry 28 hours before placing the conduit
backfill. Rib stiffeners do not need to be coated.
2.
Construct buried liner waterproofing membrane protection in the fill according
to the manufacturer’s recommendations. The
buried liner waterproofing membrane protection must be a continuous sheet
placed over the conduit and extend at least 10 feet (3.3m) outside of the paved
shoulder and for the width of the trench. Seams constructed in the field
are not acceptable.
611.10 Drainage Structure Construction. Install
drainage structures as shown on the plans and standard construction
drawings. Maintain flows at all times until the new facilities are
completed and in service.
Visually
inspect all precast drainage structures in the presence of the Engineer before
they are placed. Replace all drainage structures that are damaged as determined
by the Engineer.
Install
each drainage structure casting to the elevation, station, and offset shown on
the plans. Any deviations must be approved by the Engineer. If the
Engineer does not approve the deviation, stop all related work until the
drainage structure is reinstalled. The offset is to the center of the
casting. Place each manhole base so that it is in alignment with the pipe
and its invert elevation according to the standard construction drawings.
Use flat slab top manholes as shown on the standard construction drawing.
Do not remove the flat slab top manhole lifting devices.
Locate
or cut conduits so any protrusion inside the structure wall is minimized.
Set
iron frames, tops, and covers in mortar with a flush joint.
Prevent
earth or debris resulting from construction operations from entering the
drainage structure. Remove any debris resulting from construction.
Thoroughly
grout the underdrain outlet pipe to the precast
reinforced concrete outlet with a flush mortar joint.
Take
adequate precautions to prevent concrete or mortar from freezing. Preheat
the brick, concrete block, or precast concrete structure throughout the entire
mass to a temperature between 50 to 80 °F (10 to 27 °C)
before placing mortar if the ambient temperature is 40 °F (4 °C) or
less.
A. Brick and Block
Masonry. For brick and block masonry drainage structure
construction thoroughly wet the units before placing in mortar. Lay the units
with a flush mortar joint. Cure the exposed surfaces of all brick and block
masonry by covering with wet burlap or by applying a curing membrane according
to 705.07. Keep burlap wet for at
least 48 hours.
B. Modular Precast Concrete. For precast
concrete modular drainage structures furnish precast bases on a compacted bed
with or without a bedding material as described in the installation plan.
Ensure that the bed is level and uniformly supports the entire area of the
base. Seal all joints between modules as described above for concrete
conduit.
All penetrations
through precast drainage structures must be either manufactured or cored.
After placing the
conduit, grout all openings less than 4 inches (100 mm) between the pipe and
structure with mortar. Grout all openings greater than 4 inches (100 mm)
between the pipe and structure with non-shrink mortar. Furnish the same curing
membrane for barrier inlets as that used on the barrier. Apply the curing
membrane according to 622.07.
C. Reconstruction to
grade. When reconstructing an
existing manhole, catch basin or inlet to grade, follow the procedure below.
1.
Carefully remove and clean the existing castings.
2.
Remove the existing walls of manholes down to the spring line of the conduit or
below as necessary. Remove existing walls of catch basins and inlets
below the window openings, grates, or any points of wall failure.
3.
Using the salvaged casting, reconstruct the structure to the new grade,
conforming as nearly as practicable to the existing dimension and type of
construction.
D. Adjustment to grade.
When adjusting an existing manhole, catch basin, or inlet to match
grade, follow the procedure below.
1.
Carefully remove and clean the existing frame, adjust the height of supporting
walls, and reset the existing frame in mortar or concrete to the new grade.
2.
Carefully remove the existing cover or grate and install a casting or an
acceptable adjusting device on file at the Laboratory or an adjusting device
approved by the Engineer to the new grade and install according to the
adjusting device manufacturer’s recommendations.
611.11 Field Paving of New or Existing Conduit. Field pave the bottom of the conduit with concrete as shown on the
plans.
For
new pipe installations, do not pave until at least 4 feet (1.2 m) of fill is
placed on top of the conduit or the top of subgrade is reached. If the
paving is placed before completion of the entire fill, clean any gaps between
the conduit and concrete paving, and then fill with heated bituminous material
conforming to 705.04.
Reinforce
the paving with 4 x 4-W1.4 x W1.4 galvanized welded wire fabric or
comparable. Provide a mesh with a width 4 inches (100 mm) less than the
finished paving. Securely fasten the mesh to the conduit near each edge
and at the center of the mesh at points not more than 4 feet (1.2 m) apart
along the flow line of the culvert. Repair any damage to the galvanizing
or other coating material caused by placement or by tack welding. Use
wire brushing and zinc rich paint to make the repairs.
For
aluminum structural plate, securely fasten the mesh to the circumferential seam
bolts with galvanized tie wire.
Construct
paving so that it is 3 inches (75 mm) thick measured from the top of the
corrugations of the conduit to a height equal to 1/3 of the rise. Provide
galvanized reinforcing steel support chairs beneath the mesh where necessary.
Maintain the position of the mesh while placing concrete. After placing
the concrete, strike it off with a template to produce the proper radius, and
finish with a float to produce a smooth finish. Cure the concrete according to 451.11.
611.12 Performance Inspection. Notify
the Engineer at least five workdays before conducting a performance
inspection. Ensure the Engineer is present during all performance
inspection activities.
For
all Type A, B, and C conduits, inspect all lengths
greater than 20 feet with slopes of 25 percent or less and all new drainage
structures. A performance inspection is not required for projects that
meet all of the following:
All
conduit is Type C
Conduit
plan quantities are less than 100 feet (30.5m)
All
conduit has less than 16 feet (4.8m) of maximum fill
height
Perform
the inspection no sooner than 30 days and no later than 90 days after the
completion of the finished grade when not below pavement and after the
completion of the aggregate base when any
portion of the conduit is below pavement. The Engineer may permit
inspection beyond the 90 day limit . If any
corrections are made to the installed pipe after the completion of the finished
grade or aggregate base and prior to the performance inspection, wait 30 days
after the correction was made to do the performance inspection. If the
contract duration will not permit a 30 day waiting period then the Engineer may
adjust the waiting period.
Conduct
a performance survey to verify that the elevation and location of each Type B
and C conduit and drainage structure is within the tolerances listed in 611.13 and 611.14.
Conduct a performance survey to verify that the elevation and location of each
Type A conduit matches the plan. The 30 day
waiting period does not apply to the performance survey. Notify the
Engineer at least two workdays before conducting the performance survey.
Furnish
a video recording of each inspection. On the recording, identify the date
and time of the inspection, a description of the conduit or drainage structure
being inspected, the location, and the viewing direction. Record the entire run
of conduit being inspected. Provide a source of light that allows all
areas of concern to be readily observed on the video recording. Furnish
the video recording in a digital, reproducible format on one of the following
media types: DVD, CD or other media type approved by the Office
of Hydraulic Engineering.
Ensure
that the condition of the conduit will allow an accurate inspection. Perform a
manual inspection on drainage structures. Perform either a manual
inspection or remote inspection as follows:
Non-circular conduits –
Manual inspection
Conduits
with a rise of 48 inches (120000 mm) and greater – Manual inspection.
Conduits with a rise of 36
inches (900mm) up to 48 inches (1200mm) – Manual or Remote inspection.
Conduits with
a rise of 12 inches or greater up to 36 inches (300 to 900 mm) – Remote
inspection.
Conduits with a rise less
than 12 inches (300 mm) and Type D, E, and F conduits – Remote inspection as
directed by the Engineer. The Department will pay for this inspection
according to 105.10.
A. Manual Inspection. Perform a manual
inspection by entering the conduit or drainage structure to record video and to
make measurements. If the conduit or drainage structure is considered a
confined space, provide entry for all project inspection personnel according to
OSHA requirements.
Measure the
deflection of the conduit using either a metal or fabric tape and read to the
nearest ˝ inch (10 mm). Measure crack width using
either a crack comparator or a feeler gage capable of measuring 0.01 inch (0.25
mm). Measure joint gaps using a tape or ruler
and read to the nearest ˝ inch (10 mm). Other measuring devices
may be used if approved by the Engineer. Record the measurements and
include them in the performance report. Measure the following:
1.
For all conduits, measure the location, length, and greatest width of each
crack.
2.
For flexible conduit, measure the smallest inside diameter three times for each
conduit section in the run. Take the first measurement vertically from
the crown to invert (12 o’clock to 6 o’clock positions). Take the second
measurement by rotating 60 degrees from vertical (2 o’clock to 8 o’clock positions).
Take the third measurement by rotating 120 degrees from vertical (4 o’clock to
10 o’clock positions). For all measurements, stretch tape to full extent
across inside of pipe. For corrugated metal conduit, the inside diameter
is defined as the distance between the inside peaks of the corrugations.
3.
For all conduits, measure the widest gap at each joint in the run.
4.
For conduit with manufactured seams, measure the location, length, and greatest
width of any separation at the seam.
5.
For drainage structures, measure the location, length and greatest width of
each crack and the widest gap at each conduit entering the drainage structure.
Record
the location of any other defect not listed above and describe the defect. For each measurement location in a
conduit, record the length from the nearest drainage structure.
B. Remote Inspection. Perform a remote inspection by using a crawler
mounted camera to record video and using equipment described below to make
measurements. Use equipment that meets the requirements of Supplemental
Specification 902. Remove all debris from the conduits being
inspected according to 107.19.
Dewater the conduit if the water level hinders the performance of the
equipment.
Based on the type of
conduit, make measurements using the equipment listed in the following table.
Also record the location of any other defect not listed below
and describe the defect.
Conduit Type |
Measurement Equipment |
Type of Measurement |
Rigid conduit and 707.11,
mortar lined corrugated steel pipe |
Crawler mounted camera according to
902.01with
crack measuring capabilities according to 902.02
C |
Joint gaps Crack widths |
Plastic conduit, 707.12,
corrugated steel spiral rib conduit, 707.24,
corrugated aluminum spiral rib conduit, 748.01,
ductile iron pipe and 748.06, steel
casing pipe, and Circular corrugated metal conduit not listed below |
Crawler mounted camera with laser
profiler according to 902.02
A, B, and C or Mandrel according to 902.03
and Crawler mounted camera according to 902.01
with crack measuring capabilities according to 902.02
C |
Joint gaps Crack widths Deflection |
The following types of corrugated metal conduit: 707.04, precoated, galvanized steel culverts 707.05 and 707.07, bituminous coated corrugated steel
pipe with paved invert, |
Crawler mounted camera with laser
profiler according to 902.02
A, B, and C |
Joint gaps Crack widths Deflection |
611.13 Conduit Evaluation. Have an
independent Registered Engineer evaluate the conduit and any defects as
required by AASHTO LRFD Bridge Construction Specifications, Section 26
for metal conduit, Section 27 for concrete conduit,
and Section 30 for plastic conduit with modifications according to this
specification. The independent Registered Engineer cannot be an employee
of the Contractor or the conduit manufacturer.
When
using a laser profiler, the conduit deflection must be calculated from the
actual inside diameter at the measured location or calculated by inputting the
nominal diameter. When using a mandrel, the mandrel must be sized
according to 902.
.If the evaluation determines repairs are not necessary and repairs are not
required based on the type or size of the defect in Table
611.13, have the independent Registered Engineer
make the following statement in the evaluation:
“I
certify that repairs are not required to address the defects identified during
the conduit evaluation. The conduit will function as designed in
accordance with the contract documents.”
If
the evaluation determines repairs are necessary, or if repairs are required
based on the type or size of the defect in Table
611.13, have the independent Registered Engineer prepare, sign, seal, and
date plans for the repair. The independent Registered Engineer must make
the following statement on the repair plans:
“I
certify that this repair plan was designed to ensure the repaired conduit will
function as designed and will meet the requirements described in the contract
documents.”
Metal Conduit |
Evaluate if infiltration is
observed. Evaluate all racking, buckling or
denting. Evaluate vertical alignment of
conduit – Ensure there are no vertical sags in the conduit that trap water. Evaluate if the joint gap exceeds
the tolerance* for a length less than 1/3 of the circumference. Repair or replace conduit if the
joint gap exceeds the tolerance* for a length greater than or equal to 1/3 of
the circumference. Repair all damage to coatings. Repair or replace conduit if the
mandrel per 902.03
does not pass through the conduit or the laser profiler per 902.02
indicates a deflection > 7.5%. |
Rigid Conduit |
Evaluate if infiltration is
observed. Evaluate if joint gap exceeds the
tolerance* for a length less than 1/3 of the circumference. Evaluate vertical alignment of conduit
– Ensure there are no vertical sags in the conduit that trap water.
Repair or replace conduit if the joint gap exceeds the tolerance* for a
length greater than or equal to 1/3 of the circumference. Repair or replace conduit if cracks
> 0.10 inch. Repair or replace conduit if spalls
or slabbing are observed. |
Plastic Conduit |
Evaluate if infiltration is
observed. Evaluate all racking, bulging or
buckling. Evaluate if joint gap exceeds the
tolerance* for a length less than 1/3 of the circumference. Evaluate vertical alignment of
conduit – Ensure there are no vertical sags in the conduit that trap water.
Evaluate all cracks. Repair or replace conduit if the
joint gap exceeds the tolerance* for a length greater than or equal to 1/3 of
the circumference. Repair or replace conduit if the
mandrel per 902.03
does not pass through the conduit or the laser profiler per 902.02
indicates a deflection > 7.5%. |
*
Note: The tolerance is defined as the maximum joint gap listed in the
Installation Plan.
Submit
the evaluation, repair plans, and revised installation plan to the Engineer at
least 7 days before performing the repairs. Provide written confirmation from
the conduit manufacturer that the repair methods are appropriate. The
Department may review the submittal, but Department acceptance is not
required. If the Department does not review the plan, proceed with the
repairs 7 days after delivering the submittal to the Engineer. If the
Department reviews the submittal and determines it does not conform to the
Contract, revise, resubmit, and proceed with the repairs only after the
Department accepts the resubmittal.
Perform
the repair at no additional cost to the Department. Perform an inspection
to evaluate the repaired portion of the conduit and any conduit potentially
affected by the repair work 30 days after the repair has been made.
Perform the inspections according to 611.12 and
at no additional cost to the Department.
611.14 Drainage Structure Evaluation. Have an
independent Registered Engineer evaluate the drainage structures and any
defects listed in the table below. The independent Registered Engineer
cannot be an employee of the Contractor or drainage structure manufacturer.
Defects requiring evaluation |
Connection between conduit and drainage structure has free
flowing water or infiltration. |
Grate is more than 0.1 ft (30 mm)
from horizontal or vertical location documented on construction inspection
forms CA-P-1
or CA-P-3. |
Invert elevation is more than 5 percent of the conduit
diameter or 0.1 ft (30 mm) from plan elevation,
whichever is greater. |
Grates do not properly seat in the frame. |
Grates are not placed on the required slope. |
Grates or frames are broken or cracked. |
Drainage structure does not match the details on the
standard construction drawing. |
Steps do not line up. |
Manhole top does not match plans. |
If
the evaluation determines repairs are not necessary, have the independent
Registered Engineer make the following statement in the evaluation:
“I
certify that repairs are not required to address the defects identified during
the drainage structure evaluation. The drainage structure will function
as designed in accordance with the contract documents.”
If
the evaluation determines repairs are necessary have the independent Registered
Engineer prepare, sign, seal, and date plans for the repair. The
independent Registered Engineer must make the following statement on the repair
plans:
“I
certify that this repair plan was designed to ensure the structure will
function as originally designed and will meet the requirements described in the
contract documents.”
Perform
the repair at no additional cost to the Department. Perform an inspection
to evaluate the repaired portion of the drainage structure and any conduit
potentially affected by the repair work 30 days after the repair has been
made. Perform the inspections according to 611.12
and at no additional cost to the Department.
611.15 Surface Settlements. Repair any
surface settlement within the trench limits or within 4 feet (1.2 m) of a
drainage structure. Have an independent Registered Engineer evaluate the
conduit according to 611.13 or the drainage
structure according to 611.14. Perform all
repair work at no additional cost to the Department.
611.16 Method of Measurement. The Department
will measure conduit by the number of feet (meters), measured from
center-to-center of small drainage structures or between open ends including
the length of pipe bends and branches. The Department will not deduct
conduit length for catch basins, inlets, or manholes where the distance
measured in the direction of flow, including bends, is 6 feet (2 m) or
less. Where the location of a drainage structure or an open end is
changed with the approval of the Engineer to accommodate full conduit sections,
the Department will measure the length placed. Conduits placed on slopes
steeper than 3H:1V or with beveled or skewed ends will
be measured along the invert.
The
Department will measure field paving of existing pipe by the number of feet
(meters).
The
Department will measure Manholes, Inlets, Catch Basins, Inspection Wells,
Junction Chambers, and Precast Reinforced Concrete Outlets, whether new,
reconstructed, or adjusted to grade, by the number of each type of structure
complete and accepted.
611.17 Basis of Payment. Payment
for all inspections is included with the contract unit price of the
corresponding pay item. When a pay item calls for concrete encasement,
the Department will pay for furnishing and placing the concrete encasement and
for any additional excavation required under the contract unit price for the
encased conduit. When a pay item calls for a new conduit to be field
paved, the Department will pay for field paving, including all work and
materials necessary for the item, under the contract unit price for the
conduit.
All
required repairs, including any settlement problems, must be made prior to
acceptance. Payment for the repair is included with the contract unit price of
the corresponding pay item. The Department will not make additional payment for
repair work on conduit installed under this specification.
The
Department will pay for accepted quantities at the contract prices shown below
according to the following schedule:
After installation of
conduit or drainage
structure
60%
After performance
inspection is
completed
10%
After acceptance of the
conduit or drainage
structure
30%
Item
Unit
Description
611
Foot
(Meter)
___" (___ mm) Conduit, Type ___
611
Foot
(Meter)
___ ´ ___ Conduit, Type ___
611
Foot
(Meter)
___" (___ mm) Conduit Reconstructed,
Type ___
611
Foot
(Meter)
Type ___ Precast Reinforced Concrete
Three-Sided Flat Topped
Culvert, ___' (___ mm) Span ´ ___'
(___ mm) Rise
611
Foot
(Meter)
Type ___Precast Reinforced Concrete
Arch Sections,
___' (___ mm) Span ´ ___' (___ mm) Rise
611
Foot (Meter)
Type ___ Precast Reinforced Concrete
Round Sections,
___' (___ mm) Span ´ ___' (___ mm) Rise
611
Foot (Meter)
___' (___ mm) Rise ´ ___' (___ mm)
Span Conduit,
Type A Corrugated Steel Box Culvert,
___' (___ mm) Minimum Cover,
___' (___ mm) Maximum Cover
611
Foot
(Meter)
___' (___ mm) Rise ´ ___' (___ mm)
Span Conduit,
Type ___Corrugated Aluminum Box Culvert,
___' (___ mm) Minimum Cover, ___'
(___ mm) Maximum Cover
611
Foot
(Meter)
___" (___ mm) Conduit, Type ___, with
Field Paving of Pipe
611
Foot
(Meter)
___" (___ mm) Conduit, Type ___,
Field Paving of Existing Pipe
611
Foot
(Meter)
Conduit, Type F for underdrain outlets
611
Each
Manholes
611
Each
Inlets
611
Each
Catch Basins
611
Each
Inspection Wells
611
Each
Junction Chambers
611
Each
Manhole, Catch Basin or Inlet Reconstructed
to Grade
611
Each
Manhole, Catch Basin, or Inlet Adjusted
to Grade
611
Each
Precast Reinforced Concrete Outlet