540BOX CULVERTS

Box Culverts Art. 540.02 447

523.01Description. This work shall consist of constructing a bridge drainage

system.

523.02Materials. Materials shall be according to the following

Item Article/Section

CONSTRUCTION REQUIREMENTS

523.03General. The Contractor shall make allowances for the differential

expansion and contraction expected between the superstructure and substructure, both horizontal and vertical, to which the drainage system is attached.

All connections of pipes and fittings shown on the plans to facilitate maintenance cleanout shall be made with a threaded, gasketed coupler or a bolted gasketed flange system. Adhesive bonded joints will be permitted for runs of pipes between such connections. The end run connection shall feature a minimum nominal 6 in. (150 mm) female threaded fiberglass outlet. Straight runs may utilize a 45 degree reducing saddle bonded to the pipe. The female outlet shall be filled with a male threaded PVC plug.

When drainage systems connect with concrete drainage structures, the connection between the end run and the drainage structure shall be sealed with grout.

523.04Basis of Payment. This work will be paid for at the contract lump sum

price for DRAINAGE SYSTEM FOR STRUCTURES.

CULVERTS

SECTION 540. BOX CULVERTS

540.01Description. This work shall consist of constructing cast-in-place

concrete and precast concrete box culverts.

540.02Materials. Materials shall be according to the following

Item Article/Section

Art. 540.02 Box Culverts 448

Note 1. The porous granular material placed below a precast box shall be gradation CA 7, CA 11, or CA 18.

540.03Equipment. Equipment shall be according to Articles 503.03 and

504.03

CONSTRUCTION REQUIREMENTS

540.04General. Cast-in-place concrete box culverts shall be constructed

according to the applicable portions of Section 503.

The Contractor shall have the option, when a cast-in-place concrete box culvert is specified, of constructing the box culvert using precast box culvert sections when the design cover is 6 in. (150 mm) minimum. The precast box culvert sections shall be designed for the same design cover shown on the plans for cast-in-place box culvert, shall be of equal or larger size opening, and shall satisfy the design requirements of ASTM C 1577.

The Contractor shall be responsible for diverting the water flow from the construction area using a method meeting the approval of the Engineer.

The excavation and backfilling for concrete box culverts shall be according to Section 502.

540.05Cast-In-Place Concrete Box Culverts. Concrete culvert footings

shall be considered as consisting of all monolithic wingwall footings, all curtain walls below the flow line of the barrel, the base slab, and the sidewalls and wingwalls to a height of approximately 6 in. (150 mm) above the base slab.

The footings shall be placed as a monolith and allowed to set for a period of time sufficient to preclude the possibility of damage by subsequent work. In the construction of box culverts 6 ft (2 m) or less in vertical clearance, the side walls and top slab may be constructed as a monolith in the same placing operations. When this method of construction is used, any necessary construction joints shall be vertical and at right angles to the axis of the culvert. In box culverts of sufficient size to prohibit that part above the footing being completed in one continuous operation, horizontal construction joints will be permitted below the top slab at locations shown on the plans. A horizontal construction joint will be required below the top slab of any culvert having a vertical clearance of more than 6 ft (2 m).

Cast-in-place concrete culvert slabs built to roadway grade shall be finished according to Article 503.16(a).

540.06Precast Concrete Box Culverts. End sections may be precast or

cast-in-place. Cast-in-place end sections shall include all cast-in-place collars, headwalls, cutoff walls, wingwalls, footings, and reinforcement necessary to complete the end sections.

Box Culverts Art. 540.07 449 Where cast-in-place headwalls and vertical cantilever wingwalls are used as shown in the contract plans, they shall be collared around the end of the precast section. Where cast-in-place horizontal cantilever wingwalls are used as shown in the contract plans, they shall be poured monolithically with at least 6 ft (2 m) of cast- in-place box section. The cast-in-place box section shall be collared around the end of the precast section. The cast-in-place collars shall be reinforced.

Shop drawings shall be submitted according to Article 1042.03(b) for all precast concrete box culvert sections, precast or cast-in-place end sections and headwalls, and cast-in-place collars. Shop drawings for precast concrete box culvert sections which satisfy the standard shapes, reinforcement, and detailing of ASTM C 1577 are not required to be reviewed and approved by the Engineer.

The excavation and backfilling for precast concrete box culverts shall be according to the requirements of Section 502, except a layer of porous granular material, at least 6 in. (150 mm) in thickness, shall be placed below the elevation of the bottom of the box. The porous granular material shall extend at least 2 ft (600 mm) beyond each side of the box. The precast concrete box culvert shall be laid according to the applicable requirements of Article 542.04(d). After installation, the interior and exterior joint gap between precast concrete box culvert sections shall be a maximum of 1 1/2 in. (38 mm).

The joints between precast box sections shall be sealed and all voids filled with a mastic joint sealer. In addition, the joints shall be externally sealed on the sides and top using 13 in. (325 mm) wide external sealing bands. Prior to applying the sealing band, the concrete surface shall be cleaned to remove dirt or laitance and allowed to dry. The sealing band shall be centered over the joint, secured in place, and protected from damage during the backfilling operation.

When multi-cells are used, a 3 in. (75 mm) nominal space shall be left between adjacent sections. After the precast cells are in place and backfill has been placed to midheight of the precast concrete box sections on each side, the space between the cells shall be filled with Class SI concrete. The Class SI concrete shall be according to Section 1020, except the maximum size coarse aggregate shall be 3/8 in. (10 mm).

Handling holes shall be filled with a precast concrete plug and sealed with mastic or mortar, or filled with a polyethylene plug. The plug shall not project beyond the inside surface after installation. When metal lifting inserts are used, their sockets shall be filled with mastic or mortar.

540.07Method of Measurement. This work will be measured for payment as

follows.

shall conform to Article 202.07(a).

measured for payment in cubic yards (cubic meters) as specified in Article 503.21.

Reinforcement bars for cast-in-place concrete box culverts will be measured for payment in pounds (kilograms) as specified in Article 508.10.

Art. 540.08 Box Culverts 450

When precast concrete box culverts are specified on the plans, they will be measured for payment in feet (meters), except the length measured shall not exceed the length shown on the plans or authorized by the Engineer. The overall length shall be measured as shown on the plans along the centerline of each cell of the culvert. The end sections will be measured for payment in place as each.

Excavation in rock will be measured for payment according to Article 502.12.

The volume of any unstable and/or unsuitable material removed below plan bedding grade will be measured for payment in cubic yards (cubic meters).

540.08Basis of Payment. Cast-in-place concrete box culverts will be paid

for at the contract unit price per cubic yard (cubic meter) for CONCRETE BOX CULVERTS. Reinforcement will be paid for according to Article 508.11. Concrete protected according to Article 1020.13(d) may be paid for at the adjusted unit prices according to Article 503.22.

Expansion bolts will be paid for at the contract unit price per each for EXPANSION BOLTS of the size indicated.

When specified on the plans, precast concrete box culverts will be paid for at the contract unit price per foot (meter) for PRECAST CONCRETE BOX CULVERTS of the size specified.

End sections will be paid for at the contract unit price per each for BOX CULVERT END SECTIONS of the culvert number specified. If the Contractor, with the approval of the Engineer, elects to use a different end section from that shown on the plans, no adjustment in the cost of the precast box culverts or end sections will be allowed.

When the plans specify cast-in-place concrete box culvert and the Contractor, at his/her option, constructs the alternate precast concrete box culvert, no adjustment in the cost for the specified cast-in-place culvert will be allowed. Compensation under the contract bid items for concrete box culverts and reinforcement bars shall cover the cost of the precast concrete box culvert alternate complete.

Excavation in rock will be paid for according to Article 502.13.

Removal and disposal of unstable and/or unsuitable material below plan bedding grade will be paid for according to Article 502.13.

SECTION 541. RESERVED

Pipe Culverts Art. 542.02 451

SECTION 542. PIPE CULVERTS

542.01Description. This work shall consist of furnishing and installing pipe

culverts.

542.02Materials. Materials shall be according to the following

Item Article/Section

Note 1. The fine aggregate shall be moist.

Note 2. The coarse aggregate shall be wet.

Note 3. Pipe culverts (jacked) shall be tongue and groove type joint and not less than a Class IV pipe.