SECTION 602 – DRAINAGE STRUCTURES
602.01 Description
This Section describes the requirements for constructing, reconstructing, and cleaning inlets and manholes. This Section also describes the requirements for constructing and cleaning concrete culverts and concrete headwalls with a span of less than 5 feet.
602.02 Materials
602.02.01 Materials
Provide materials as specified: Coarse Aggregate (No. 57) ................................ ................................ ................................ ............................ 901.03 Soil Aggregate (I-3) ................................ ................................ ................................ ................................ ...... 901.11 Concrete ................................ ................................ ................................ ................................ ....................... 903.03 Mortar ................................ ................................ ................................ ................................ ..................... 903.08.01 Curing Materials ................................ ................................ ................................ ................................ ........... 903.10 Precast Inlet and Manhole ................................ ................................ ................................ ............................. 904.01 Reinforcement Steel ................................ ................................ ................................ ................................ ...... 905.01 Castings ................................ ................................ ................................ ................................ ........................ 909.03 Epoxy Bedding Compound ................................ ................................ ................................ ........................ 909.03.5 Ladder Rung ................................ ................................ ................................ ................................ .............. 909.03.6 Concrete Block ................................ ................................ ................................ ................................ ............. 910.02 Concrete Brick ................................ ................................ ................................ ................................ .............. 910.03 Preformed Joint Filler ................................ ................................ ................................ ................................ ... 914.01
602.02.02 Equipment
Provide equipment as specified: Vibrator ................................ ................................ ................................ ................................ ...................... 1005.04 Concrete Batching Plant ................................ ................................ ................................ .............................. 1010.01 Concrete Trucks ................................ ................................ ................................ ................................ .......... 1010.02
602.03 Construction
602.03.01 Culvert and Headwall
Excavate as specified in 202.03.03. Shape and compact the underlying material to produce a firm, even surface.
1.Precast. Set precast culverts and headwalls on a 6 inch bed of compacted coarse aggregate. Remove handling devices and fill lifting holes with mortar.
2.Cast-in-Place. Construct cast-in-place culverts and headwalls as specified in 504.03.02.
602.03.02 Inlet and Manhole
Excavate as specified in 202.03.03. Obtain RE approval before finishing excavating. If the RE determines that the bottom of the excavation is unstable, undercut, backfill, and compact as directed by the RE. When surrounding grade is below proposed grade, provide temporary drainage into the drainage structure as directed by the RE. Repair temporary openings as necessary. Construct inlet and manhole structures as follows:
1.Precast. The Contractor may use precast concrete inlets and manholes. If modifications to precast concrete inlets and manholes are required, obtain RE approval before installation. After installation, fill the lifting holes with mortar. 2 Block and Brick Construction. Lay concrete block and brick with staggered joints. Fill with mortar horizontal joints, brick vertical joints, and concrete block key ways. Ensure that horizontal joints and vertical joints in brick are not more than 3/8 inch wide. Coat the o utside wall with at least a 1/2 inch thick layer of mortar and trowel smooth. When the ambient temperature is below 40 °F, ensure that the mortar temperature is between 50 and 100 °F. Cover the masonry and maintain its temperature above 32 °F for 24 hours. Ensure that the connection between drainage structures and pipe is leak-free. Set castings in mortar beds or anchor castings to the masonry as shown before finishing adjoining Items of work with the same final elevation. Ensure that mortar attains a strength of 2,500 pounds per square inch before opening to traffic. Backfill and compact using the directed method as specified in 203.03.02.B.3. Construct inverts with a smooth and uniform finish that minimizes resistance to flow. Ensure that the shape of the inverts conforms uniformly with the inlet and outlet pipe. Set the manhole cover or inlet grate on the casting. If the manhole cover or inlet grate is loose or wobbles, grind to obtain a tight fit.
602.03.03 Set Casting, Reset Casting, and Reconstructed Inlet and Manhole
When modifying less than 1 foot of an inlet or manhole, set or reset the casting. When modifying 1 foot or more of an inlet or manhole, reconstruct the inlet or manhole. Remove castings, damaged wall portions, and ladder rungs as directed by the RE. Reuse concrete as specified in
202.03.03 C.1. Dispose of other material as specified in 202.03.03.C.2.
Reconstruct the walls to the elevation shown, and, if necessary, install new ladder rungs. Set castings in mortar beds or anchor castings to the masonry as shown before finishing adjoining Items of work with the same final elevation. If excavation is required to reconstruct, backfill and compact using the directed method as specified in 203.03.02.B.3. Set the manhole cover or bicycle safe grate on the casting. If the manhole cover or bicycle safe grate is loose or wobbles, grind to obtain a tight fit. Do not open to traffic until 3 days after the grout was set.
602.03.04 Inlet Converted to Manhole
Remove castings, unsound wall portions, and ladder rungs as directed by the RE. Reuse concrete as specified in
202.03.03 C.1. Dispose of other material as specified in 202.03.03.C.2.
Reconstruct the walls to the shown elevation and install new ladder rungs. Set castings in mortar beds or anchor castings to the masonry as shown before finishing adjoining Items of work with the same final elevation. If excavation is required to reconstruct, backfill and compact using the directed method as specified in 203.03.02.B.3. Set the manhole cover on the casting. If the manhole cover is loose or wobbles, grind to obtain a tight fit. Ensure that mortar attains a strength of 2,500 pounds per square inch before opening to traffic.
602.03.05 Extension Frame and Extension Ring
If structures contain existing frames or rings, remove extension frames or rings. Use the minimum number of frames or rings necessary to achieve the proposed grades. Place the extension frame or ring in the casting and check for fit. Before applying epoxy bedding compound, clean the surfaces that will receive the epoxy bedding compound, the lower bearing surfaces, and sides of the extensio n frames or rings. Clean by sand blasting or brushing with a mechanically - driven wire wheel to ensure that the epoxy bedding compound adheres to the surfaces. Wipe the prepared surfaces with a rapid-evaporating degreasing agent. Apply extra epoxy bedding compound where there are gaps in the fit. Apply the epoxy bedding compound according to the manufacturer’s recommendations, and immediately set the extension frame or ring into the epoxy bedding compound. Ensure that the frame or ring is in full contact with the casting and that the epoxy bedding compound fills the gaps. Set the bicycle safe grate or manhole cover on the extension frame or ring. If the bicycle safe grate or manhole cover is loose or wobbles after being set in the extension frames or rings, grind to obtain a tight fit or replace as directed. Repair damage to galvanized coatings according to ASTM A 780. Dispose of materials removed from the existing structure as specified in 201.03.01.H.
602.03.06 Manhole Cover and Bicycle Safe Grate
Set the manhole cover or bicycle safe grate on the casting. If the manhole cover or bicycle safe grate is loose or wobbles, grind to obtain a tight fit. Dispose of materials removed from the existing structure as specified in 201.03.01.H.
602.03.07 Curb Piece
Remove curb pieces of existing inlets and install new curb pieces. Dispose of materials removed from existing structure as specified in 201.03.01.H. Bolt the curb piece to the frame before setting the frame in concrete or mortar. Ensure that all castings are set firm and snug.
Referenced in this section
Sections that cite this one
Drainage Structures in other states
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 321–323 of 651. View official source ↗