ITEM 602 MASONRY
602.01
Description
602.02
Materials
602.03
Construction Requirements
602.04 Method
of Measurement
602.05 Basis of
Payment
602.01 Description. This work consists of
constructing headwalls, pipe cradles, collars, and other brick and masonry
units of the types and sizes specified.
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.
602.02 Materials. Furnish materials conforming to:
Backfill.........................................................................
203
Concrete, Class
QC-Misc................................. 499 and 511
Water for grout and
mortar...................................... 499.02
Reinforcing
steel...................................................... 509.02
Cement for
mortar.......................... 701.01 through 701.07
Sand for
mortar........................................................ 703.03
Granular base ........... Granular material, Type B, 703.16.C
Brick and masonry units................
704.01, 704.02,
704.03
Nonshrink
mortar.................................................... 705.22
Lime for
mortar........................................................ 712.04
602.03 Construction Requirements. Construct
the designated items as shown on the plans.
A. Excavate to dimensions that provide
ample room for construction. Remove obstructions as necessary to perform
this work.
Protect the sides of
all excavations from caving by providing suitable sheeting, shoring, and bracing.
Use excavation methods that do not disturb the original material below the
bottom of footers or below the additional 6 inches (150 mm) required for
precast structures.
If the material found
at the bottom of the headwall or below the additional 6 inches (150 mm)
required for precast structures is not suitable for a foundation, excavate to
further depth to provide a suitable foundation. Backfill the void left by the
additional excavation with granular base. The Department will pay for
this additional work according to 109.05.
Backfilling shall
follow completion of the work as closely as the construction will allow. Backfill with granular base or soil. Place backfill in
6-inch (150 mm) loose lifts.
B. Compaction requirements are according
to Item 203 except for the following:
Four passes per lift
with additional passes as required until 95 percent compaction is
reached. Use compaction equipment with a minimum total weight of, or
minimum centrifugal force of, 1 ton (0.9 metric ton). Supply the
manufacturer’s specifications for this equipment to verify these requirements.
C. Cast-in-place structures are
headwalls, pipe cradles, collars, and other units. Construct cast-in-place
structures according to the corresponding Standard Construction Drawing using
methods specified in Items 499, 511, and 509.
D. Precast structures are half height
headwalls for conduits up to a maximum of 78 inches (1980 mm). These
pre-approved precast structure drawings are on file in the Office
Material Management. With the submission of the TE-24 from an approved
manufacturer furnish stamped, approved from the Office
of Hydraulic Engineering design drawing sheets. Precast half-height
headwalls for elliptical and pipe arch conduits may be constructed from
templates of the actual conduit being supplied, up to a maximum 78 inch (1980
mm) (round equivalent) to the project to ensure the opening is OD plus one
inch. Submit drawings to the Office
of Hydraulic Engineering for approval, on a
project by project basis, of precast half-height headwalls for elliptical and
pipe arch conduit. Non-pre-approved drawings are required to be submitted
to the Office
of Hydraulic Engineering for approval. Allow 4 weeks for approval.
Failure to furnish the stamped, approved design drawing sheets will result in
rejection of the precast structure. The drawings will include the
following:
1.
All manufacturers are pre-approved according to Supplement 1073.
2.
All reinforcing steel will be epoxy coated.
3.
All HW-2.1
SCD require wire insert details.
4.
Attachment detail for metal or plastic conduit conforming to SCD HW2.1.
5.
Non-corrosive lifting devices.
6.
Maximum opening is conduit outside diameter plus 1 inch (25 mm) for each
conduit material type.
7.
All openings to be filled with nonshrink mortar
including all lifting device voids.
8.
Changes in pre-approved drawings are the same as non pre-approved drawings.
9.
Detail how the 6 inch (150 mm) extension is treated if required.
10.
Fill the void between the precast half height headwall and the conduit by using
nonshrink mortar.
11.
Apply marking, either stamped or painted, to the headwall to ensure each
headwall size is matched to the proper conduit size and material type.
E. Pre-cast structures for wing walls and headwalls for use with
Items 706.05, 706.051, 706.052, and 706.053. The Contractor may provide precast
wingwalls or headwalls in lieu of cast-in-place walls
using the following criteria:
1. Select
fabricators that are prequalified and evaluated by the Office
of Materials Management (OMM) according to
Supplement 1073
and listed by the Department before the Contract Letting Date.
2. All reinforcing
steel shall be epoxy coated.
3. Wall anchorage
dowels shall be epoxy coated as per 709.00
or galvanized as per 709.16.
4. Galvanize all
connection hardware per 711.02.
5. Install dowels
per 510 using non-shrink, non-metallic 705.20 epoxy grout.
6. Provide the
entrained air requirements as per the applicable concrete specification.
7. Provide
Non-corrosive lifting devices.
8. Fill all
openings including all lifting hook voids with non-shrink mortar per 705.22.
9. Provide shop
drawings detailing precast concrete structural elements and calculations according
to the AASHTO LRFD Bridge Design
Specifications.
10. Have an Ohio Registered Engineer
prepare, sign, seal and date the shop drawings. Have a second Ohio Registered Engineer
check, sign, seal and date the shop drawings. The
preparer and checker shall be two different Engineers. Have all questions and
comments addressed before submitting the shop drawings.
11. Submit the shop drawings and
calculations to the Engineer at least 7 days before construction begins.
Department acceptance is not required.
12. The Contractor’s written
acceptance letter shall document acceptance of the shop drawings including
confirmation of field verification, as required, and descriptions of issues
resolved between the Contractor, the fabricator, or the Department.
13. By accepting these shop drawings,
the Contractor represents to the Department that all dimensions and
elevations of existing conditions shown on the plans have been field measured
and verified, and that these shop drawings comply with all the materials
requirements, construction requirements, contract requirements, and performance
criteria. The Contractor further represents that these drawings have been
coordinated and verified with the details of the work to be performed by other
fabricators and entities on the project. The Department will not make any
allowance for additional cost or delays to the Contractor for incorrect
fabrication as a result of failure to coordinate or perform this acceptance.
14. If the Department requests
changes on these shop drawings, or the Contractor makes changes in
addition to those expressly requested, ensure that the shop drawings are
accepted as above with suitable revision marks to identify the changes.
15. Shop Drawing General
Requirements:
a.Provide a separate shop drawing for each culvert location.
b.Provide on 11” x 17” sheets in pdf
(portable document format).
c. Show:
i. All dimensions.
ii. Inlet and outlet.
iii. North arrow.
iv. Roadway centerline stationing.
v. All construction phases.
vi. Precast piece labels
vii. Holes for conduits, framed with diagonal
reinforcing on both faces.
viii. Reinforcing Lap lengths
ix. Material strengths
x. Weep holes locations
xi. Lifting device locations.
d. Label:
i. Project Number
ii. PID
iii. County Route Section of the structure
iv. Stream Name as show on plans
v. Structure File Number or Culvert File Number
as given on the plans
vi. Fabrication facility where units are to be
cast
F. Masonry units
structures are headwalls, pipe cradles, collars, and other units. Thoroughly wet masonry units before laying the mortar. Lay
masonry units with full mortar joints. Take adequate precautions to prevent the
mortar from freezing. Do not set masonry units having a temperature of 40
°F (4 °C) or less with mortar until heated. When required, heat to ensure
that a temperature of 50 to 80 °F (10 to 27 °C) is obtained throughout the
entire masonry units. Cure the exposed surfaces of the masonry units by
covering with wet burlap for 48 hours or by applying curing membrane according
to Item 511. Construct the masonry units structures according to the corresponding Standard
Construction Drawing. Use one of the following mortars:
1.
One part Portland cement to two parts sand by volume. The Contractor may
add lime in an amount not to exceed 10 percent of the cement by weight
2.
One part masonry cement to two parts sand by volume.
602.04 Method of Measurement. The
Department will measure Brick Masonry, Block Masonry, and Concrete Masonry by
the number of cubic yards (cubic meters) calculated from dimensions shown on
the plans.
602.05 Basis of Payment. When a
precast structure is used, payment is based on the number of cubic yards (cubic
meters) required for the cast in place item and is considered full compensation
for construction of the precast structure.
The Department
will pay for accepted quantities at the contract prices as follows:
Item
Unit
Description
602
Cubic
Yard
Brick Masonry
(Cubic Meter)
602
Cubic
Yard
Block Masonry
(Cubic Meter)
602
Cubic
Yard
Concrete Masonry
(Cubic Meter)