503Bridge Railing

Bridge Railing

503.1DESCRIPTION

1 This section describes the requirements for constructing steel bridge railing, pedestrian railing, and bridge railing modifications.

503.2MATERIALS

1 Provide materials in accordance with the following:

Material Subsection High Strength Bolts and Fasteners 815.2 Bridge Railing 815.9 Galvanized Coating 815.14 High Strength Anchor Bolts 815.18

2 Use an adhesive anchorage system approved by the Bridge Program.

503.3EQUIPMENT—V acant

503.4CONSTRUCTION

503.4.1 General

1 Fabricate and construct bridge railing in accordance with Section 501, Structural Steel.

503.4.2 Fabrication

1 Ensure that venting and pick-up holes in rails and sleeves are shown on the fabricator’s shop drawings. Place vent holes on the underside of the rail members as installed.

2 Ensure that post base plates are flat after fabrication.

3 Shop-curve rail members for curved bridges with a radius of less than 1000 ft [300 m].

4 Grind rough edges on posts and rails smooth before galvanizing. Galvanize railing and hardware in accordance with Subsection 501.4.1.25, Galvanizing. Straight or unwelded tubes may be galvanized before fabrication, provided that cut surfaces are repaired in accordance with Subsection 501.4.1.25, Galvanizing. In addition to the requirements of AASHTO M 111 or ASTM A123, ensure that the galvanizing is free of general roughness, dross pimples, blisters, and wet storage stain.

Bridge Railing SECTION 503

5 Use nonmetallic spacers at least 1½ in [38 mm] thick to separate rails bundled together for storage or shipment. Ensure that metal bundling straps do not touch the rails.

503.4.3 Erection

503.4.3.1 General

1 After installing rail elements, paint the exposed rail bolt threads with two coats of zinc - rich paint in accordance with ASTM A 780.

503.4.3.2 New Construction

1 Place and properly align railing posts before placing new concrete.

2 Paint surfaces of any field drilled holes with two coats of zinc -rich paint in accordance with ASTM A 780.

503.4.3.3 Railing Modification

1 For railing modification, remove existing rail, posts, associated hardware, and portions of anchor bolts protruding beyond the concrete surface when required. Removed bridge railing becomes the contractor’s property.

2 If removing and resetting bridge railing, reuse rails, posts, and splice sleeves. Toggle bolts become property of the contractor; do not reuse them. Use new U-bolts to reattach rails to the posts. Match- mark items to be reused before removal. Replace items damaged during removal and resetting at no additional cost to the department.

3 Set anchor bolts or threaded rods for railing modification with an adhesive anchorage system. E nsure that the anchor holes in the concrete are the diameter and length recommended by the adhesive manufacturer to achieve a minimum pullout capacity equaling the ultimate tensile strength of the anchor bolt or threaded rod. Provide at least 2 in [50 mm] between the bottom of drilled holes and the underside of the concrete slab.

503.5MEASUREMENT and PAYMENT

1 The engineer will measure:

by the foot [meter] or by the complete unit.

2 The engineer will not include sleeves for attaching guardrail in the measurement for Bridge Railing or Bridge Railing Modification.

Bridge Railing SECTION 503

3 The department will pay as follows:

Pay Item Pay Unit Measure to the Nearest Pay to the Nearest Bridge Railing FT [m] 0.1 ft [0.05 m] FT [0.5 m] Bridge Railing Modification LS, FT [LS, m] LS, 0.1 ft [LS, 0.05 m] LS, FT [LS, 0.5 m] Pedestrian Railing FT [m] 0.1 ft [0.05 m] FT [0.5 m] Pedestrian Railing Modification LS, FT [LS, m] LS, 0.1 ft [LS, 0.05 m] LS, FT [LS, 0.5 m] Reset Bridge Railing LS, FT [LS, m] LS, 0.1 ft [LS, 0.05 m] LS, FT [LS, 0.5 m]