591GEOCOMPOSITE WALL DRAIN

590.04 Method of Measurement. This work will be measured for payment in

place in feet (meters).

590.05 Basis of Payment. This work will be paid for at the contract unit price

per foot (meter) for EPOXY CRACK INJECTION. SECTION 591. GEOCOMPOSITE WALL DRAIN

591.01 Description. This work shall consist of furnishing and installing

geocomposite wall drain on the soil side of abutment walls, wing walls, retaining walls, and culvert sidewalls.

591.02 Materials. Materials shall be according to the following.

Item Article/Section

591.03 General. Geocomposite wall drain shall be constructed in horizontal

courses with the first course resting on the top of the footing. The geocomposite shall be in direct contact with the wall and secured with concrete nails not less than 2 in. (50 mm) long with approved washers not less than 9 sq in. (5800 sq mm) in area. The spacing of the concrete nails shall be as directed by the Engineer but shall not be more than 3 ft (1 m) apart, both horizontally and vertically. There shall be at least one horizontal row of nails in each course. Horizontal seams shall be formed by a 4 in. (100 mm) flap of geotextile extending from the upper course and lapping over the top of the lower course or by a 12 in. (300 mm) wide continuous strip of geotextile centered over the seam and securely fastened to the upper course with continuous 3 in. (75 mm) wide plastic tape. The overlapping flap or strip shall be fastened to the lower course intermittently as directed by the Engineer, but the spacing shall not exceed 2 ft (600 mm). Vertical splices shall be formed by a 4 in. (100 mm) flap of geotextile extending from one or the other abutting pieces or by a 12 in. (300 mm) wide continuous strip of geotextile centered over the splice. Vertical splice flaps or strips shall be continuously fastened to the geocomposite with continuous applications of contact adhesive or 3 in. (75 mm) wide plastic tape. The bottom, side, and top edges of the geocomposite shall be covered with a suitable cap formed by folding a 6 in. (150 mm) flap or a 12 in. (300 mm) wide strip of geotextile over the edge and securing it in place with a continuous application of contact adhesive or 3 in. (75 mm) wide plastic tape. All seams, splices, bottom caps, top caps, and end caps shall be constructed so that backfill material cannot enter the geocomposite during or after construction. Connection to pipe outlet systems shall be as shown on the plans. Outlet fittings shall be fastened to the wall drains as directed by the manufacturer and so that backfill materials cannot enter the system during or after construction. If necessary, to facilitate the rapid and complete flow of water from the wall drain into the pipe Art. 592.01 Bridge Washing outlet, a portion of the wall drain core equal to the cross section at the outlet shall be removed. Weep holes shall be accommodated by cutting a matching hole through the wall drain. An approved weep hole cover extending at least 4 in. (100 mm) from the edge(s) of the hole shall be securely fastened to the soil side of the wall drain by 3 in. (75 mm) wide plastic tape or contact adhesive applied continuously around its periphery.

591.04 Method of Measurement. This work will be measured for payment in

place and the area computed in square yards (square meters).

591.05 Basis of Payment. This work will be paid for at the contract unit price

per square yard (square meter) for GEOCOMPOSITE WALL DRAIN. SECTION 592. BRIDGE WASHING

592.01 Description. This work shall consist of washing the entire bridge,

including bridge deck, sidewalk, curbs, pier and abutment caps, all superstructure members, trusses, interior of truss members, flanges and webs of beams or girders, expansion joints, and drains to prevent deterioration of the structure.

592.02 Materials. Water shall be according to Section 1002.

592.03 Equipment. Washing equipment shall consist of power brooms, air

compressors, water tanks, water pumps with associated delivery hardware, and hand tools, to properly flush, clean, and remove all foreign material from the bridge structure. Other types of washing equipment may be used, subject to approval of the Engineer. Water pressure shall be sufficient to remove the accumulated material without damaging paint coverage of the structural steel. Other equipment may be necessary to gain access to areas designated for washing. It will be the Contractor's responsibility to determine and utilize whatever method and equipment best suits his/her operation to successfully wash the structure. This equipment shall be available to the inspector until final acceptance of the work. CONSTRUCTION REQUIREMENTS

592.04 General. All accumulated foreign material shall be removed from the

bridge. Special care shall be taken on connected parts, members below open joints and difficult to reach areas to remove all foreign material. All deck drains shall be flushed with water under pressure. Blockages in the deck drains shall be removed so that they will drain properly. The drain system may have to be taken apart to remove large blockages. Should they be taken apart, they shall be returned to their original configuration immediately after washing. Foreign material in the scuppers at the drains shall be either removed externally or flushed down the drain system. The area beneath all expansion devices shall be thoroughly flushed and washed with water under pressure. These areas include drain troughs beneath the expansion device and pier tops immediately adjacent to the expansion device. All abutment and bridge seats shall have foreign material removed by