Section 602 — Culverts and Drains

Description

602.01This work consists of providing and installing culverts, drains, and precast concrete box culverts.

Material

602.02Conform to the following Sections and Subsections: Asphalt mastic 702.04 Concrete pipe 706 General mortar 701.05(a) Metal pipe 707 Plastic pipe 708 Precast concrete units and accessories 725.09 Sealants, fillers, and seals 712.01

Construction Requir ements

602.03General. Provide culvert pipe with a wall thickness at least that shown in the plans or determined from the fill -height tables shown in the plans. Use the same material and coating on contiguous pipe sections and special sections (such as el bows and branch connections). For culvert extensions, provide the same material as the existing culvert. Plans show the size, length, and approximate location of culverts. Determine final location, skew, length, elevations, and grade according to Section 152. Do not order culvert material until the CO has accepted the final structure size, length, and alignment. Construct cast -in-place concrete box culverts according to Section 552. For preca st concrete box culverts, submit design drawings and details with supporting calculations according to Subsection 104.06. Design and construct precast concrete box culverts according to Sect ion 578. Excavate and backfill according to Section 209. Place elongated pipes with the minor axis within 5 degrees of vertical. Construct a piping plug unless the culvert inlet is protected with a full -height headwall, slo pe paving, or an embankment consisting of AASHTO M 145 classification A -6 or A -7 material. Construct the piping plug with AASHTO M 145 classification A -6, A-7, or other approved material with a permeability no more than 0.004 inch per second. 602.04 Laying Concrete Pipe and Precast Concrete Box Culverts. Start at the lower end and lay the bell or groove end upgrade. Fully join sections with leak- resistant seals using one of the following methods:

(a)Mortared joints. Clean the lower portion of the receiving end of the pipe. Plaster the inside with sufficient joint mortar to bring the inner surfaces of the abutting pipe sections flush and even. Fit the sections as close as the construction of the culvert allows. Fill and seal joints with mortar insid e and out. Use the mortar within 30 minutes after mixing. Clean excess mortar from the inside of the joint. Cure mortar outside of joints by covering with polyethylene sheeting or spraying with a curing compound. Backfill while mortar is plastic or, if mortar sets before backfilling, wait at least 24 hours before backfilling.

(b)Gasket joints. Conform to ASTM C990 or ASTM C443 and the following:

(1)Protect the joint ends from mud, silt, gravel, or other foreign material. Lay the pipe sections with gaskets attached. Remove, clean, relubricate, and reseat gaskets disturbed or contaminated.

(2)Align the pipe sections. Force the joints home using the pipe manufacturer’s recommended procedure. Do not drive or ram by hand or machinery. Block the last section of each day’s run to prevent creep. Install supplemental concrete pipe ties on the last downstream pipe -to-pipe joint and at the downstream pipe- to-end section joint, if present.

602.05Laying Metal Pipe. Position the pipe with a longitudinal joint so the joint is opposite the invert. Fully join pipe sections with leak -resistant seals according to AASHTO M 36 or AASHTO M 196. Use one of the following:

(a)Gasket, bell, and spigot joints. Use on slopes of 10 percent or less and lay the pipe with the bell end up slope. (b) Coupling bands with gaskets. Limit the use of coupling bands with projections (dimples) to attaching prefabricated flared end sections. If aluminum alloys come in contact with other metals, coat the contacting surfaces with asphalt mastic or a preapproved impregnated caulking compound.

602.06Laying Plastic Pipe. Lay plastic pipe according to the pipe manufacturer’s recommendations. Fully join pipe sections with leak -resistant seals using gasket, bell, and spigot joints according to ASTM D3212.

602.07Laying Slotted Drain Pipe. Fully join pipe sections with leak -resistant seals using coupling bands and gaskets. Cover the slots with roofing paper or other approved covering during backfilling and paving to keep material out of the pipe. Backfill with a flow able backfill.

602.08Acceptance. Material for culverts and drains will be evaluated under Subsections 106.02 and 106.03. Installation of culverts and drains will be evaluated under Subsections 106.02 and 106.04. Cast-in-place concrete box culverts will be evaluated under Section 552. Excavation and backfill will be evaluated under Section 209. Precast concrete box culverts will be evaluated under Section 578. Survey work will be evaluated under Section 152.

Measurement

602.09Measure the Section 602 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: When measuring pipe and box culverts by the linear foot, measure along the invert. Measure end sections, elbows, and branch connections by the each. If there is no pay item for elbows or branch connections, measure them as additional pipe length along the invert.

Payment

602.10The accepted quantities will be paid at the contract price per unit of measurement for the Section 602 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 .