508Bridge Drainage

508.01 Description

This Section describes the requirements for constructing scuppers, inlets, and downspouts for surface drainage of bridge decks.

508.02 Materials

Provide materials as specified: Bolts and Bolting Material ................................ ................................ ................................ ............................ 908.01 Steel Alloy Pipe ................................ ................................ ................................ ................................ ....... 909.02.07 Fiberglass Pipe ................................ ................................ ................................ ................................ ......... 909.02.09 Gray Iron Casting Frame ................................ ................................ ................................ ............................ 909.03.1 Ductile Iron Casting Grates ................................ ................................ ................................ ........................ 909.03.4 If inlet frames, grates, and scuppers are fabricated from steel, galvanize as specified in 912.02.01.

508.03 Construction

508.03.01 Inlet Frame and Grate

Ensure that the bearing surfaces of frames and grates are machined so that the grates have uniform bearing on the frames. Ensure that the bearing surfaces are match marked before being delivered. Ensure that the frames are set flush with the deck surface.

508.03.02 Scupper

Install Scuppers as shown on the Plans.

508.03.03 Steel Alloy Pipe

Repair areas where galvanizing has been damaged as specified in 912.02.01. Obtain RE approval of the type of threaded concrete inserts for support brackets and clamp.

508.03.04 Fiberglass Pipe

Ensure that pipe supports are located at spacings that do not exceed the pipe manufacturer’s recommendations. Avoid supports that have point contact or narrow supporting areas. If suitable, steel pipe may be used with the standard slings, clamps, and clevis hangers and shoe supports. Ensure that the minimum strap width of all pipe hangers meets the pipe manufacturer’s recommendations. Ensure that straps have a minimum of 120 degrees of contact with the pipe. On pipe supported on surface with less than 120 degrees of contac t use a split fiberglass pipe protective sleeve bonded in place with adhesive. Ensure that all connections of pipes and fittings shown on the Plans to facilitate future removal for maintenance cleanout or flushing are made with a threaded, gasketed coupler or a bolted gasketed flange system. Use only female–male threaded plugs for cleanouts.

508.04 Measurement and Payment

The Department will measure and make payment for Items as follows: Item Pay Unit INLET FRAME AND GRATE UNIT SCUPPER UNIT ___" STEEL ALLOY PIPE LINEAR FOOT ___" FIBERGLASS PIPE LINEAR FOOT