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- 20-2.07A(2) Definitions Reserved 20-2.07A(3) Submittals
- 20-2.07B(1) General Reserved 20-2.07B(2) ABS Composite Pipe Conduit
- 20-2.07B(4) Corrugated Steel Pipe Conduit
- 20-2.07B(5) PVC Pipe Conduit
- 20-2.07C(2) Welded Steel Pipe Conduit
- 20-2.07C(2)(b) Directional Boring
- 20-2.07C(2)(c) Jack and Drill
- 20-2.07C(3) Schedule 40 PVC Pipe Conduit
20-2.07 IRRIGATION CONDUIT20-2.07A General20-2.07A(1) SummarySection 20-2.07 includes specifications for installing irrigation conduit. Before performing work on irrigation systems, locate existing irrigation conduits shown to be incorporated into the new work. Before removing or disturbing existing pavement markers that show the location of the existing irrigation conduit, mark the location of the existing conduit on the pavement.
20-2.07A(2) DefinitionsReserved 20-2.07A(3) SubmittalsReserved 20-2.07A(4) Quality AssuranceDemonstrate that the irrigation conduits are free from obstructions after placement of base and surfacing. Before and after extending the irrigation supply line in an irrigation conduit, pressure test the supply line under section 20-2.01A(4)(b). After conductors are installed in an irrigation conduit, test the conductors under section 20-2.04A(4). Assign a technical representative to direct and control the directional bore activities. The representative must be present during directional bore activities. Unless otherwise authorized, perform directional bore activities in the presence of the Engineer. 20-2.07B Materials20-2.07B(1) GeneralReserved 20-2.07B(2) ABS Composite Pipe ConduitABS composite pipe and couplings must comply with ASTM D2680. Couplings must be solvent cement type. 20-2.07B(3) Corrugated HDPE Pipe ConduitCorrugated HDPE pipe must comply with ASTM F405 and ASTM F667 or be Type S complying with AASHTO M252 and AASHTO M294. Couplings and fittings must be as recommended by the pipe manufacturer. 20-2.07B(4) Corrugated Steel Pipe ConduitCorrugated pipe conduit must comply with section 66. The nominal thickness of metal sheets for pipe must be 0.064 inch for corrugated steel pipe and 0.060 inch for corrugated aluminum pipe. Coupling bands and hardware must comply with section 66. 20-2.07B(5) PVC Pipe ConduitPVC pipe conduit must be schedule 40 complying with ASTM D1785. Fittings must be schedule 80. 20-2.07B(6) Welded Steel Pipe ConduitWelded steel pipe must comply with ASTM A53. Pipe must be black and have either welded or threaded joints. The wall thickness for the various sizes of welded steel pipe must have the thickness shown in the following table:
20-2.07C Construction20-2.07C(1) GeneralIf existing irrigation conduits are to be incorporated into new work, excavate exploratory holes for locating existing conduits at the locations indicated by existing markers or as directed. Excavate and backfill exploratory holes to a maximum size of 2-1/2 feet in width, 5 feet in depth, and 5 feet on each side of the marker or directed location parallel to the roadway. If the conduit is not found and if ordered, increase the size of the exploratory holes beyond the dimensions specified. The additional excavation and backfill is change order work. If extending an existing conduit, remove the existing conductors from the conduit. Use a coupling band if the new conduit matches the existing conduit diameter; otherwise overlap the conduit at least 12 inches. After extending the existing conduits, install conductors that match the color and size of the existing conductors without splices. Splice conductors in adjacent pull boxes. If installing a control and neutral conductor and electrical conduit through the irrigation conduit, install a no. 5 pull box at each end. Remove any debris found in the conduit before performing other work. Removing debris located more than 3 feet from the ends of the conduits is change order work. Extend conduit 2 feet beyond all paving. Cap the ends of unused conduit. Type A pavement markers and adhesive must comply with section 81-3.
20-2.07C(2)(a) GeneralInstall welded steel pipe by directional boring or jack and drill. Install top of conduits from: 1. 18 to 30 inches below the finished surface in sidewalk areas 2. 40 to 52 inches below the finished grade in other paved areas 20-2.07C(2)(b) Directional BoringNotify the Engineer at least 2 business days before starting directional bore activities. The diameter of the boring tool for directional boring must be only as large as necessary to install the conduit. Mineral slurry or wetting solution may be used to lubricate the boring tool and to stabilize the soil surrounding the boring path. The mineral slurry or wetting solution must be water based. The directional bore equipment must have directional control of the boring tool and have an electronic boring tool location detection system. During operation, the directional bore equipment must be able to determine the location of the tool both horizontally and vertically. 20-2.07C(2)(c) Jack and DrillNotify the Engineer at least 2 business days before starting jack and drill activities. Jacking or drilling pits must be no closer than 2 feet from the pavement edge whenever possible. If authorized, small holes may be cut in the pavement to locate or remove obstructions. Do not use excessive water that will soften the subgrade or undermine the pavement. 20-2.07C(3) Schedule 40 PVC Pipe ConduitWhere schedule 40 PVC pipe conduit 2 inches or less in outside diameter is installed under surfacing, you may install by directional boring under section 20-2.07C(2)(b). For conduit 2 inches or less in diameter, the top of the conduit must be a minimum of 18 inches below surfacing. Extend schedule 40 PVC pipe conduit 6 inches beyond surfacing. Cap ends of conduit until used.
20-2.07D PaymentNot Used Directory: esc esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko esc -> Escort affinity Program for Audi Club Members esc -> Preliminary entry form pistol esc -> Application form esc -> Request from Asian and Pacific Training Centre for Information and esc -> Constitution of the engineering student council university of maryland esc -> Subdisciplines of Earth Science Geology; study of the earth Download 6.74 Mb. Share with your friends:
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