ITEM 601 SLOPE AND CHANNEL PROTECTION
601.01
Description
601.02
Materials
601.03 General
Construction
601.04 Riprap
601.05 Grouted
Riprap or Rock
601.06 Crushed
Aggregate Slope Protection
601.07 Concrete
Slope Protection
601.08 Dumped
Rock Fill
601.09 Rock
Channel Protection
601.10
Detention Basin, Infiltration Basin, or Water Quantity Swale Aggregate
601.11 Paved
Gutter
601.12 Tied
Concrete Block Mat
601.13
Articulating Concrete Block Revetment System
601.14 Method
of Measurement
601.15 Basis of
Payment
601.01 Description. This work consists of the
excavation for and the construction of gutters, riprap, concrete, grouted
items, tied concrete block mats, articulating concrete block revetment systems,
crushed aggregate, or rock items for protecting slopes and channels.
Use
removed or excavated materials in the Work when the material conforms to the
specifications; if not, then recycle or dispose of the material according to 105.16 and 105.17.
601.02 Materials. Furnish materials conforming to:
Curing..............................................
451 or 705.07
Type 1
Concrete, Class
QC-Misc...................................... 499,
511
Water for
grout........................................................ 499.02
Reinforcing
steel...................................................... 509.02
Cement for
grout........................................................... 701
Structural Backfill Type
3........................................ 703.11
Sand for
grout.......................................................... 703.03
Rock and Aggregate
Materials................................. 703.19
Brick and
blocks........................................................... 704
Preformed expansion
joint....................................... 705.03
Joint
sealer............................................................... 705.04
Filter fabric, Type
B................................................. 712.09
Provide
steel filter fabric securing pins with washers for securing filter
fabric. Use a steel washer having an outside diameter not less than 1 1/2
inches (38 mm). Use securing pins at least 18 inches (0.5 m) long and at
least 3/16 inch (5 mm) in diameter that are pointed at one end and fabricated
with a head to retain the steel washer.
Ensure
tied concrete block mats and articulating concrete block revetment systems are
held together by galvanized steel wire, HDPE mesh,
stainless steel wire, or any material that has a service life of 75 years or
more as approved by the Office of Hydraulic Engineering.
601.03 General Construction. Cure
gutters, concrete slope protection, and grouted riprap according to Item 451, except apply all the membrane cures at the rate
of not less than 1 gallon per 200 square feet (1 L/5 m²) of surface.
Mix
and place all concrete according to Item 511.
Finish to produce a sandy texture.
601.04 Riprap. Construct riprap according to one
of the following four alternatives unless specifically itemized in the
Contract. The Contractor may elect to use a different alternative at each
location on the project.
A. Provide Flat Stones or Broken
Concrete. Ensure that
individual pieces are roughly rectangular in cross-section with a minimum
volume of 1/3 cubic foot (0.01 m³) and a minimum thickness of 3 inches (75
mm). Place individual pieces by hand in courses and so that the pieces
overlap the joints in the course below. Place riprap with the flat
surfaces roughly perpendicular to the slope and in contact with the courses
immediately below and above. Fill spaces between larger pieces with
spalls that are rammed into place to present an even and tight surface,
pleasing in appearance and varying not more than 3 inches (75 mm) from that
shown on the plans. When required by the plans, fill riprap with
grout. Compact the backing as riprap construction progresses.
Ensure that the thickness of the riprap, measured perpendicular to the slope,
is not flatter than 9 inches (230 mm) and averages not flatter than 12 inches
(0.3 m).
Approved
manufacturers are on file with the Office
of Materials Management. For approval, manufacturers will submit
product information to the Office
of Hydraulic Engineering.
B. Provide Articulating Concrete Block
Revetment System. Ensure articulating
concrete block revetment conform to 712.1-3.
Install according to the manufacturer’s recommendations.
C. Construct Concrete Riprap Using Cloth
or Burlap Bags. After soaking
the bags with water, fill them with approximately 2/3 cubic foot (0.02 m³) of
concrete and place the bags by hand to the limits on the plans. Provide
bags with approximate dimensions of 6 x 12 x 16 inches (150 x 300 x 400 mm).
Stack the bags on the
slope to ensure a minimum of 1/3 cubic yard (0.3 m³) of concrete for each
square yard (square meter) of riprap in place as measured along the slope.
Tie the open end of
each bag and fold the tie under the bag. Place each tie or fold so that
it overlaps the joint in the lower layer. After placing, pierce each bag
in the lower layer to allow some concrete to flow out and bond with the top
overlying layer.
Stretchers are bags
placed with the long length parallel to the streambed flow. Headers are
bags placed with the long length perpendicular to the streambed flow. A
layer runs horizontally at approximately the same elevation perpendicular to the
protected slope grade.
If the slope is 1.5:1
or steeper, make the bottom layer with two bags laid as stretchers. Place
the next overlying layer as a header. Place the rest of the overlying
upslope layers as stretchers.
If the slope is
flatter than 1.5:1, make the bottom layer with two bags as stretchers.
Place all remaining layers as headers.
Push or drive No. 4
(No. 13M) reinforcing bars approximately 18 inches (0.5 m) long and spaced
approximately 12 inches (0.3 m) apart through the top three layers. When
required by the plans, fill voids with grout.
D. Construct a 6-inch (150 mm) Reinforced
Concrete Slab. Reinforce the
slab approximately midway between the top and bottom of the slab with steel
bars or fabricated reinforcement equivalent to No. 3 (No. 10M) round bars,
spaced at 24-inch (0.6 m) centers in two directions, or wire fabric according
to the standard construction drawing for pavement reinforcing. The
Contractor may use formed construction joints. Extend reinforcement
through all formed construction joints. Include cutoff walls as shown on
the plans in the unit price bid for reinforced concrete slab.
601.05 Grouted Riprap or Rock. When
specified, grout in place riprap cloth bags, riprap burlap bags, flat stones,
precast blocks, broken concrete, rock, or tied concrete block mats. Make
the grout by mixing one part portland
cement, three parts sand, and enough water to allow the grout to flow into the
joints and cracks.
Prepare
the grout in a mixing machine of an approved design and equipped with an
accurate graduated regulating device for controlling the amount of water in
each batch. Accurately measure and proportion the quantities for each
batch, and ensure that the quantities are exactly sufficient for one or more
sacks of cement.
Immediately
before applying grout, thoroughly wet all surfaces. Place the grout,
filling all the joints or voids. Do not add water to the grout after it
has been placed.
601.06 Crushed Aggregate Slope Protection. Furnish
material conforming to 703.19.
Place the material on the filter fabric so that the surface is flush with the
embankment slopes. Use a thickness of 12 inches (300 mm) unless a
different thickness is specified. Extend the aggregate from the face of
the abutments down to the toe of the slope or to normal water elevation, and a
minimum of 3 feet (1 m) beyond the outer edges of the superstructures or as
shown on the plans.
601.07 Concrete Slope Protection. Construct
a concrete slab, 6 inches (150 mm) thick, extending over the embankment area
under a bridge from the face of the abutment down to the toe of the slope and
extending a minimum of 3 feet (1 m) beyond the outer edges of the
superstructure or as shown on the plans. Thicken the bottom 3 feet
(1 m) of the concrete slab from 6 to 18 inches (150 to 460 mm) to provide
resistance to sliding.
Where pier columns extend through the
slab, place 1-inch (25 mm) preformed expansion joint material around the
columns and for the full thickness of the slab.
Divide the
surface into an equally spaced block grid pattern at approximately 4 to 5-foot
(1.2 to 1.5 m) intervals. Make the block grid pattern with one direction
horizontally at a constant elevation or as directed by the Engineer, and the
other direction parallel to the superstructure centerline, skewed, or as
directed by the Engineer. Saw or form the block grid pattern to make
joints at a depth of not less than one-fourth the thickness of the slab and
approximately 1/8 inch (3 mm) wide.
601.08 Dumped Rock Fill. Furnish
material conforming to 703.19. Dump
larger pieces at the outer face and smaller pieces in the inner surface of the
protected area. Ensure a reasonably smooth and continuous surface
conforming to the slope lines shown on the plans. Avoid concentration of
fines and small pieces at any location in the completed dumped rock fill
material. When required by the plans fill all voids with grout.
601.09 Rock Channel Protection.
Furnish material conforming to 703.19.
When specified with a filter, provide a filter consisting of filter fabric or a
6-inch (150 mm) bed of aggregate conforming to 703.19.
When placing rock, exercise reasonable care to ensure that the finished surface
of the protected channel conforms to the channel cross-sections shown on the
plans.
If filter fabric
is used, prepare the surface to receive the fabric to a relatively smooth
surface, free of obstruction and debris. With the long dimension parallel
to the flow direction, loosely place the fabric without wrinkles and
creases. Where joints are necessary, provide a 12-inch (0.3 m) minimum
overlap, with the upstream strip overlapping the downstream strip. Place
securing pins with washers at a minimum distance apart of 2 feet (0.6 m) along
the joints and at a minimum distance apart of 5 feet (1.5 m) everywhere
else. When required by the plans fill all voids with grout.
601.10 Detention Basin or Infiltration Basin. For
detention basin or infiltration basin aggregate, furnish material conforming to
Structural Backfill Type 3 at 6 inches (150 mm) thick. Use a filter consisting
of filter fabric. When placing aggregate, exercise reasonable care to
ensure that the finished surface of the basin conforms to the details shown in
the plans.
601.11 Paved Gutter. Mix and
place concrete paved gutters according to Items 499 and
511 and to the dimensions and shape shown on the
plans or the standard construction drawing.
When
gutter constructed under this item is to be tied to an existing concrete base,
pavement, or other rigid structure, match the type and location of the joints
in the gutter with those in the adjoining pavement.
When
gutter constructed under this item is not tied to an existing concrete base,
form impressed joints using a device or bar shaped to the gutter
cross-section. Make the impression before initial setting of the newly
placed concrete. Remove the device or bar as soon as the concrete is in
such condition to retain its shape when the bar or device is removed.
Form an impressed joint that is 3/8 inch (10 mm) wide at the surface; 1/4 inch
(6 mm) wide at the bottom; and a depth equal to one-third the thickness of the
concrete. Edge the joints to a radius not greater than 1/4 inch (6
mm). Until the filler is placed, protect the joint from dirt or foreign
matter. Fill the impressed joints in such a manner to confine the
material to the joint and in no way mar the surface.
Compact
the subgrade for all paved gutters according to 204.03. When required by the plans fill all
voids with grout.
Approved
manufacturers are on file with the Laboratory. For approval,
manufacturers will submit product information to the Office
of Hydraulic Engineering.
601.12 Tied Concrete Block Mat. When
specified, use Tied Concrete Block Mat Type ___ conforming to 712.12 as shown on the plans. Place
directly on the filter fabric. Install per the manufacturer’s recommendation.
Tied Concrete Block Mats are approved by the Office
of Hydraulic Engineering. Furnish products according to the Departments
Qualified Products List (QPL).
601.13 Articulating Concrete Block Revetment System. When
specified, use Articulating Concrete Block Revetment System Type _ conforming
to 712.13 as shown on the plans.
Install per the manufacturer’s recommendation. Articulating
Concrete Block Revetment Systems are approved by the Office
of Hydraulic Engineering. Furnish products according to the Departments
Qualified Products List (QPL).
601.14 Method of Measurement. The
Department will measure Riprap, Articulating Concrete Block Revetment System,
Crushed Aggregate Slope Protection, Concrete Slope Protection, and Tied
Concrete Block Mats by the square yard (square meter) of the finished surface
completed and accepted in place, with or without grout.
The
Department will measure Dumped Rock Fill and Rock Channel Protection (with or
without filter), by the cubic yard (cubic meter), completed and accepted in
place according to the dimensions shown on the plans, excluding rock filter,
with or without grout. The Department may determine quantities by volume
in the vehicle or by a job conversion weight of acceptable material delivered.
The
Department will measure Paved Gutter by the foot (meter) completed and accepted
in place.
601.15 Basis of Payment. The
Department will specify with grout in the pay item description when
required. When the pay item calls out Tied Concrete Block Mat or
Articulating Concrete Block Revetment System, include filter fabric material
and installation in the price.
The
Department will pay for accepted quantities at the contract prices as follows:
Item
Unit
Description
601
Square
Yard
Riprap
(Square Meter)
601
Square
Yard
Crushed Aggregate Slope Protection
(Square
Meter)
601
Square
Yard
Concrete Slope Protection
(Square Meter)
601
Square
Yard
Tied Concrete Block Mat, Type _ __
(Square Meter)
601
Cubic Yard
Articulating Concrete Block Revetment System, Type___
(Cubic
Meter)
601
Cubic
Yard
Dumped Rock Fill, Type ___
(Cubic Meter)
601
Cubic Yard
Rock Channel Protection, Type ___ with Filter
(Cubic
Meter)
601
Cubic
Yard
Rock Channel Protection, Type ___ without Filter
(Cubic Meter)
601
Cubic
Yard
Rock Channel Protection, Type ___ with Aggregate Filter
(Cubic
Meter)
601
Cubic
Yard
Detention Basin Aggregate
(Cubic Meter)
601
Cubic
Yard
Infiltration Basin Aggregate
(Cubic Meter)
601
Foot
(Meter)
Paved Gutter