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- 66-1.04 PAYMENT
- 66-2.01 GENERAL
- 66-2.03 CONSTRUCTION
- 66-2.04 PAYMENT
- 66-3.02 MATERIALS
66-1.03 CONSTRUCTIONExcavate a pipe trench to the lines and grades established by the Engineer. Grade and prepare the trench bottom to provide a firm and uniform bearing throughout the entire pipe length. Lay annular corrugated pipe in a trench with: 1. Outside laps of circumferential joints upgrade 2. Longitudinal laps positioned other than in the invert 3. Separate sections spaced not more than 1-1/2 inches apart and then firmly joined together
Corrugations or projections on the coupler must properly engage the corrugations of the pipe section before bolts are tightened. Connect new corrugated metal pipe to new or existing drainage facilities as shown. Wherever pipes are connected to inlet and outlet structures, place the ends of the pipes flush or cut them off flush with the structure face. 66-1.04 PAYMENTThe payment quantity for corrugated metal pipe is the length measured along the centerline of the pipe and parallel with the slope line. The payment quantity includes the length of pipe reducers, bends, wyes, tees, and other branches to the point of intersection. Pipe reducers are paid for as pipe of the larger diameter connected to the reducer. If pipes are cut to fit a structure or slope, the payment quantity is the length of pipe necessary to be placed before cutting, measured in 2-foot increments. 66-2 SLOTTED CORRUGATED STEEL PIPE 66-2.01 GENERALSection 66-2 includes specifications for constructing slotted corrugated steel pipe. 66-2.02 MATERIALSSlotted corrugated steel pipe must be grate-slot type as shown. Grate assemblies for slotted corrugated steel pipe must comply with section 75-1, but may be fabricated from any of the materials under section 75-1.02 for steel bars, plates and shapes. Any damage to the galvanized surface of the pipe at the toe of the grate assembly fillet weld connection to the pipe must be repaired under section 75-1.02B. Where a heel guard is shown, the heel guard must be expanded metal and must comply with ASTM F1267, Type II, Class 2, and Grade B. Galvanizing must comply with section 75-1.02B. Coupling bands for slotted corrugated steel pipe must be galvanized or coated as shown. Joints must be watertight. If you use a channel coupling band, place a 3/8-inch-thick closed-cell sponge neoprene gasket or butyl rubber joint sealant in the channel interior for its full width. If you use a modified hugger band, place a butyl rubber joint sealant between the coupling band and the periphery of the pipe. The butyl rubber joint sealant material must: 1. Be an extruded strip or bead compounded from a nondrying, nontoxic, synthetic resin base with butyl rubber and inorganic extenders and be 100 percent solid material with no shrinkage 2. Be furnished in 5/8-by-1-inch strips or 1-inch-diameter beads on 1-inch-wide release paper and wound into rolls 3. Have enough adhesion so that the strip or bead will adhere to the galvanized steel and be soft enough to allow cold flow if compressed during connection of the pipe sections 4. Not flow or sag at temperatures up to 180 degrees F or become brittle, crack, or lose adhesion at -30 degrees F 5. Contain no migrating components that could leach out or produce a chemical reaction with the galvanized steel You may use an alternative joint sealant or sealing method for slotted corrugated steel pipe to provide a watertight joint if authorized. 66-2.03 CONSTRUCTIONDo not start installation of slotted corrugated steel pipe until after paving of the traffic lanes adjacent to the pipe have been completed at the locations where the pipe is to be placed. Join slotted corrugated steel pipe with coupling bands as shown. Cover pipe slots with a heavy duty tape or other authorized covering during backfilling and paving activities to prevent material from entering the slots. Place cement treated structure backfill for slotted corrugated steel pipe under the details shown and section 19-3.02E for soil cement beddings. Cover the completed cement treated structure backfill with a curing seal of asphaltic emulsion, Grade SS1 or CSS1. Do not place loads on the cement treated structure backfill within 16 hours after placement.
66-3.01 GENERALSection 66-3 includes specifications for constructing spiral rib pipe. The specifications for profile and fabrication in section 66-1 do not apply to spiral rib pipe. 66-3.02 MATERIALSSteel spiral rib pipe must be fabricated by continuous helical lock seam under section 66-1.02E(2)(c)(ii). Aluminum spiral rib pipe must be fabricated by continuous helical lock seam under section 66-1.02F(2)(c). The fabricated rib configuration for spiral rib pipe must be one of the following: 1. Three rectangular ribs spaced midway between seams with ribs 3/4 inch wide by 3/4 inch high at a maximum rib pitch of 7-1/2 inches 2. Two rectangular ribs and 1 half-circle rib equally spaced between seams with ribs 3/4 inch wide by 1 inch high at a maximum rib pitch of 11-1/2 inches with the half-circle rib diameter spaced midway between the rectangular ribs 3. For steel spiral rib pipes, 2 rectangular ribs equally spaced between seams with ribs 3/4 inch wide by 1 inch high at a maximum rib pitch of 8-1/2 inches The rib pitch measured at right angles to the direction of the ribs may vary by ±1/2 inch. Coupling bands for spiral rib pipes must comply with section 66-1.02D. You may use the coupling band shown, or an authorized coupling band under section 61-2.01D(2)(b) for use on a pipe corrugation of 2-2/3 by 1/2 inch for corrugated metal pipe on spiral rib pipe having 2-2/3-by-1/2-inch rerolled annular ends.
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