706BRIDGE RAILINGS

706.01Description

This work shall consist of the furnishing and placing of concrete or steel railings on bridges, atop or aside of wingwalls and retaining walls, furnishing and placing bridge railing pedestrian fences on new ex isting bridge railings, and furnishing and placing reinforced concrete moment slabs in accordance with 105.03.

MATERIALS

706.02Materials

Materials shall be in accordance with the following:

Barrier Delineators ...................................................... 926.02(c) Bridge Railing Pedestrian Fence ................................. 910.18(b)5 Coarse Aggregate, Class B or Higher, Size No. 8 or No. 9 ............................................... 904.03 Dowel Bars .................................................................. 910.01(b)10 Joint Materials ............................................................. 906 20 Organic Zinc Primer .................................................... 909.02(a)2 Polyurethane Finish Coat ............................................ 909.02(c) Reinforcing Bars, Epoxy Coated ................................. 910.01 Steel Bridge Railing Components ............................... 910.20

Concrete for reinforced concrete moment slabs shall be QC/QA PCCP in accordance with 501 or PCCP in accordance with 502.

Thrie-beam railing and guardrail elements for retrofit bridge railing shall be steel and shall be in accordance with the applicable requirements of 910.09 and 910.11 for 30 steel beam guardrail.

CONSTRUCTION REQUIREMENTS

706.03Concrete Railing

Concrete railings shall not be placed until the falsework for all of the spans have been removed and the spans are self supporting. Concrete railings shall be constructed in accordance with 702 and 703.

Forms shall be smooth, tight fitting, held true to line and grade, and be removed 40 without damaging the concrete. These forms shall be made from selected dressed lumber or steel. Moldings, panel work, and bevel strips shall be constructed according to the detail plans with mitered joints, true corners and be sharp, clean-cut, and free from cracks, spalls, or other defects. The forms shall be constructed with a plate at the base of the copings. Lumber used for coping forms shall be 2 in. thick.

706.03

Concrete bridge railing shall be built monolithically and continuous from support to support. A joint shall be provided at the end of the bridge between the bridge railing and the railing transition as shown on the plans.

Unless otherwise specified, the slip form method may be used to place concrete railing on bridge structures. If the slip form method is chosen, the QCP shall be prepared, signed, dated, and submitted to the Engineer for review and approval at least 15 days prior to the start of slip form barrier rail placement. The QCP shall include, as a minimum:

and admixtures,

proper consolidation around reinforcing bars, finishing and curing, and

The slip form paver shall consolidate, screed, and finish the freshly placed concrete in one complete pass so a minimum of hand finishing will be necessary to provide a dense and homogeneous railing in conformance with the plans and specifications. The slump shall be 1 3/4 in. ±3/4 in. The joints may be formed or sawed as long as a satisfactory joint is attained.

If joints are to be sawed, the full depth saw cut shall be made before uncontrolled shrinkage cracking occurs and within 48 h of concrete placement. Before full depth sawing, partial depth saw cuts of 2 1/2 in. ±1/2 in. at the joint locations may be made as soon as the concrete has hardened sufficiently to enable sawing without raveling. All saw cuts shall be made at the locations shown on the plans or as directed.

All concrete bridge railings shall be reflectorized in accordance with 602.03(f).

Posts and joints shall be constructed perpendicular to grade. The line and grade shall not follow any unevenness of the superstructure. 80

The surface of the concrete shall vary no more than 1/4 in. in 10 ft from the specified cross-section, as measured longitudinally. If concrete railing is not in compliance with the specified design, does not present a uniform appearance of smoothness or color, or is not otherwise a workmanlike job, the Engineer may require such railing to be removed and replaced.

706.04Concrete Railing with Re inforced Concrete Moment Slab

The railing portion shall be constructed in accordance with 602.03 except it shall be cast-in-place. Type D-1 c ontraction joints in the mo ment slab shall match the 90 locations of the joints in the abutting PCC pavement. If the abutting pavement is HMA, 706.04

the D-1 contraction joints shall be spaced at 18 ft. The locations of the transverse joints in the moment slab and the railing shall be the same.

Moment slabs shall be formed with either steel or wood forms in accordance with

508.04(c)1 or 508.04(c)2. Vibration of the concrete shall be in accordance with

702.20(c). The thickness of the moment slab shall match that of the adjoining PCCP,

but it shall not be less than 12 in.

The underdrains for MSE walls layer sh all be compacted in accordance with 100

302.06(b). The MSE-wall coping may be precast or cast-in-place

Type D-1 contraction joints and dowel bar assemblies shall be in accordance with 503.

Finishing and curing the moment slab shall be in accordance with 504. Finishing and curing the railing shall be in accordance with 702.

Job control testing for acceptance shall be in accordance with 502.05.

706.05Steel Railings

Fabrication and placement of steel railings shall be completed in accordance with the applicable requirements of 711. Ends of tube sections shall be milled or sawed. Cut ends shall be true, smooth, and free from burrs and ragged edges. The rail system shall be continuous except as shown on the plans. Joints shall be spliced as detailed on the plans. Welding of steel shall be in accordance with 711.32. Radiographic, magnetic particle, and dye penetrant inspection will not be required. Anchor bolts shall be pre- set in concrete.

706.06Bridge Railing Pedestrian Fence 120

Posts shall be installed plumb. They may be shimmed with an approved metallic shim. Base plate anchor bolts shall be galvanized, positioned as shown on the plans, and shall be anchored by means of epoxy adhesive.

The fabric shall be connected to the tension bar with brace bands and tension bands as shown on the plans.

The top and bottom fabric selvedges shall be knuckled. If the coating is damaged during handling or placement, such portion of the fabric shall be replaced.

706.07Method of Measurement

Concrete railing, including all concrete work above the top of curb, will be measured by the linear foot or by the cubic yard in accordance with the dimensions shown on the plans. No deductions will be made for reinforcing bars or joints. Concrete bridge railing transition will be measured per each for the type specified.

706.07

Bridge railing pedestrian fence will be measured by the linear foot along the bottom of the fence, from center to center of end posts.

Reinforced concrete moment slabs will be measured by the square yard for the 140 thickness specified. Underdrains for MSE walls placed under moment slabs will be measured in accordance with 718.09. Type D-1 contraction joints will be measured in accordance with 503.07.

Reinforcing bars in the railing will be measured in accordance with 703.07.

Barrier delineators will be measured in accordance with 602.05.

Steel railing will be measured by the linear foot in accordance with the dimensions shown on the plans or as directed. 150

Linear measurements will be made from end to end of the railing along the centerline.

706.08Basis of Payment

The accepted quantities of concrete railing will be paid for at the contract price per linear foot or cubic yard, for railing, concrete, of the type specified. Steel railing will be paid for at the contract unit price per linear foot of the type specified. Concrete bridge railing transitions will be paid for at the contract unit price per each for the type specified. Bridge railing pedestrian fence will be paid for at the contract unit price per 160 linear foot. Reinforced concrete moment slabs will be paid for at the contract unit price per square yard for the thickness specified, complete in place. Underdrains for MSE walls placed under moment slabs will be paid for in accordance with 718.10. Type D- 1 contraction joints will be paid for in accordance with 503.08. Reinforcing bars for concrete railings and concrete bridge railing transitions will be paid for in accordance with 703.08. Barrier delineator will be paid for in accordance with 602.06.

Payment will be made under:

Pay Item Pay Unit Symbol 170

Bridge Railing Pedestrian Fence ............................................... LFT Concrete Bridge Raili ng Transition, ____ ................................. EACH type Railing, Concrete ____ .............................................................. LFT type CYS Railing, Steel ____ .................................................................... LFT type Reinforced Concrete Moment Slab, ____ ................................. SYS thickness 180

706.08

The cost of painting, washers, rivets, welding, anchor bolts, and necessary incidentals shall be included in the cost of the pay items in this section.

The cost of all miscellaneous hardware including anchor bolts, base plates, fence post caps, horizontal rail end cups, fence post loop caps, tension bars, tension bands, brace bands, and fabric ties, and replacemen t fence due to damaging coating during handling or placement shall be included in the cost of bridge railing pedestrian fence.

The cost of the epoxy coated reinforcing bars and tie bars in the moment slab shall 190 be included in the cost of the reinforced concrete moment slab.

The cost of all labor and materials required to provide for the monolithic concrete coping with moment slabs shall be included in the cost of the moment slab.

The cost of furnishing and placing all materials not specified as pay items shall be included in the cost of the pay items in this section.