New Hampshire Department of Transportation Standard Specifications – 2016 Description
1.1This work shall consist of furnishing and erecting bridge rail for bridges and retaining walls in conformity with details shown
on the plans or ordered. This work shall include anchor rods or insert sleeves to support the railing and all construction a bove the top of the curb or sidewalk.
1.2Designations. Bridge rails are classified as follows:
Type Bridge Railing
Steel Tube Railing, 2 Rail ST Steel Tube Railing, 2 Rail (PL2) T2 Steel Tube Railing, 3 Rail (PL2) T3 Steel Tube Railing, 4 Rail (PL2) T4 W-Beam with Steel Tubing T101 Aluminum Railing (2 Bar) F2 Aluminum Railing (3 Bar) F3
1.3This work shall consist of furnishing and erecting protective screening or snow fence in conformity with details shown on
the plans or ordered. Aluminum and steel components for screening may not be interchanged, and shall conform to the material requirements as detailed on the plans or as stated herein. Materials
2.1Structural steel shall conform to the requirements of ASTM A572 Grade 50, unless otherwise specified on the plans, except
anchor plates may be ASTM A36. 2.1.1 Galvanized W-Beam sections shall comply with 606.2.4.
2.2Steel pipe shall conform to ASTM A 53, Grade B, seamless unless specified otherwise on the plans.
2.3Steel rail tubing shall conform to ASTM A 500, Grade B, unless otherwise specified on the plans. The tubing shall meet the
Charpy V-notch toughness requirement of 15 ft-lbs at 0 °F. CVN test samples shall be taken after forming the tubes. 2.3.1 For steel tubing rail-to-post fasteners shall be ASTM A 325 round-head bolts or ASTM A 276 Type 304 stainless steel threaded studs. All other fasteners may be ASTM A 307 bolts with ASTM A 563 nuts or cap screws. Anchor rods shall be ASTM A 449 with ASTM A 563 nuts.
2.4Galvanizing shall conform to AASHTO M 111 (ASTM A 123) for structural steel posts and tubing, AASHTO M 232 (ASTM
A 153) for bolts, nuts, and washers, and conform to ASTM A 385 to provide adequate precautions (e.g. vent holes) for a quality product. The galvanizing kettle shall have 0.05 to 0.09 percent nickel. If the galvanizing is to be painted or powder coated, follow the requirements of Section 708, Appendix A or B.
2.5The material requirements of Section 606 shall apply for W -beam guardrail, thrie-beam guardrail, and tubular thrie -beam
guardrail.
2.6Aluminum railing and aluminum and steel appurtenances shall conform to the pertinent materials specified in the latest
edition of “ A Guide To Standardized Highway Barrier Rail Hardware”, by the AASHTO- AGC-ARTBA Joint Cooperative Committee, ARTBA (formerly Technical Bulletin No. 268-B AGC Standard Form No. 131, June 1979) as amended. 2.6.1 Stainless steel studs shall meet the requirements of ASTM A 276, Type 304 modified or Type 430 modi fied, each to 100,000 psi tensile strength with 15 percent elongation.
2.7Preformed bearing pads shall be manufactured as a single sheet approximately 1/8” thick, in the required dimensions shown
on the plans. Bearing pads shall be accepted based upon receipt of a Certificate of Compliance stating that the products comply with the requirements of 2.7 (a) or (b), as applicable, including test results performed by an independent testing laboratory.
of 50 Shore A-durometer (minimum) material, adequate for 1,000 psi design compression stress, and meeting Level I test requirements with no cracks after the compressive load test, or
or synthetic fibers and vulcanized with a proportion of fiber content sufficient to maintain strength and stability. Rubber shall be polyisopren e (natural rubber) or polychloroprene (neoprene). The surface hardness shall be minimum 80 ± 5
New Hampshire Department of Transportation Standard Specifications – 2016 Shore A-durometer. The ultimate breakdown limit of the pad under compressive loading shall be no less than 7,000 psi without splits and without deformations exceeding 10 percent of thickness after removing the load.
2.8Protective screening and snow fence materials shall conform to the following:
2.8.1 Aluminum components shall meet the material requirements of Standard No. BR -R12 (BR-R12 M) except as noted below. 2.8.1.1 Aluminum chain link fabric shall be 6 -gage 1 1/2 ” mesh conforming to AASHTO M181 Type III, ASTM B211 Alloy 6061-T94. Chain link fabric shall have a knuckled finish on the top and bottom. 2.8.1.2 Aluminum tie material shall be 6 -gauge conforming to ASTM B211 F626- 96A. Wrap tie ends 1 ½ times to attach all fabric to horizontal and vertical pipe rail. Tie bands shall not be allowed for attaching the fabric to the framework. 2.8.2 Steel components shall meet the material requirements shown on the plans, except as noted below. 2.8.2.1 Steel chain link fabric shall be 9-gauge 1 1/2” mesh conforming to AASHTO M181 Type II (aluminum coated steel). Chain link fabric shall have a knuckled finish on the top and bottom. 2.8.2.2 Aluminum ties shall be used with aluminum coated steel fabric and conform to 2.8.1.2. Construction Requirements
3.1General. Bridge rail shall be fabricated at a plant with an AISC Category SBR certification. See 550.3.2.
3.2Fabrication.
3.2.1 Shop fabrication drawings shall be submitted for approval in accordance with 105.02. 3.2.1.1 The shop fabrication drawings shall show the lengths of all individual rail sections and locations of all field splices. Rail sections shall be supplied in continuous lengths as shown or specified on the plans. Butt welding of short pieces of ra il to form the specified continuous length of rail section will not be permitted. Butt splices, if approved, shall be made in the shop with complete joint penetration (CJP) groove welds and inspected by ultrasonic testing. 3.2.1.2 Horizontally-curved rail sections shall be shop bent to form a smooth curve, unless approved otherwise. It is required to secure the services of a specialty bend facility to do the work, as necessary, f or small radii (eg. less than 50 feet). Curvatures with radii less than seven feet may be achieved by miter cut and welding the tube in chords lengths appropriate for the bend. A “ miter-cut-and-weld” joint, where three sides of a tube are cut, the fourth side bent, and the cut edges welded with a backing bar, is considered to be a CJP. Curvature for T101 bridge rail tubes may be achieved with miter-cut-and-weld joints for radii less than 20 feet, if approved, since the tubes are hidden from view. 3.2.2 Steel railings shall be constructed in accordance with the plans, the pertinent provisions of 550.3, or as directed. 3.2.2.1 Welding of steel shall be done in accordance with 550.3.6. Welding shall be performed only by prequalified welders and welding operators. 3.2.2.2 Threaded studs shall be welded on after the tubes are galvanized by spot grinding off the galvanizing, welding on the studs, and repairing the damaged galvanized coating as per 3.2.2.3. 3.2.2.3 Damaged galvanized coating shall be repaired by cleaning, pretreating, and coating as specified in 550.2.9.1. 3.2.2.4 Galvanized rail tubes, posts, and components shall be stored in a manner to prevent wet storage stain. Material shall be stored off the ground and individual elements separated with spacers to prevent contact between adjacent surfaces and to provide free and adequate circulation of air. Rail shall be inclined to provide continuous drainage and prevent ponding of water. 3.2.2.4.1 Remove all ‘white rust’ (i.e. a build-up of zinc corrosion products- see 708-Appendix A) from galvanized surfaces formed due to wet storage. Loose powders shall be removed with a stiff nylon bristle brush. Heavier accumulations of white rust shall be removed with a more vigorous treatment using brushing and approved solvents. Removing the white rust is essential to the proper formation over time of normal galvanizing (zinc carbonate) layers on the surface. 3.2.3 Aluminum railing shall be constructed in accordance with the details shown on the plans. 3.2.3.1 Welding of aluminum shall conform to Section 716. 3.2.3.2 All aluminum surfaces, including shims, to be placed in contact with concrete shall be given a heavy coat of asphalt- base aluminum roof coating. 3.2.3.3 Aluminum shims in thicknesses of 1/16” , 1/8 ”, and 1/4” shall be furnished in sufficient quantities to permit adjustment of the rail alignment. The shims shall be the size of the bearing area and may be slotted for ease of installatio n. The shapes shall be shown on the shop drawings.
New Hampshire Department of Transportation Standard Specifications – 2016 Method of Measurement
4.1Bridge rail, of the type specified, will be measured, but shall be the linear foot.
Basis of Payment
5.1Bridge rail, of the type specified will be paid for at the Contract unit price per linear foot complete in place.
5.2All miscellaneous hardware needed to connect the protective screening or snow fence to the rail will not be paid for separately
but will be considered subsidiary to the appropriate bridge rail item. Pay items and units:
563.12Bridge Rail ST Linear Foot
563.22Bridge Rail T2 Linear Foot
1 Bridge Rail T2 with Protective Screening Linear Foot
3 Bridge Rail T2 with Snow Screening Linear Foot
563.23Bridge Rail T3 Linear Foot
1 Bridge Rail T3 with Protective Screening Linear Foot
563.24Bridge Rail T4 Linear Foot
1 Bridge Rail T4 with Protective Screening Linear Foot
3 Bridge Rail T4 with Snow Screening Linear Foot
563.3Bridge Rail T101 Linear Foot
563.72Bridge Rail F (2-bar) Linear Foot
1 Bridge Rail F (2-Bar) with Protective Screening Linear Foot
3 Bridge Rail F (2-Bar) with Snow Screening Linear Foot
563.73Bridge Rail F (3-bar) Linear Foot
1 Bridge Rail F (3-Bar) with Protective Screening Linear Foot
3 Bridge Rail F (3-Bar) with Snow Screening Linear Foot
563.8Resetting Bridge Rail Linear Foot
563.81Rehabilitation of Bridge Rail Linear Foot
563.84Temporary Bridge Rail Linear Foot
563.94Protective Screening for Overpass Structures Linear Foot
New Hampshire Department of Transportation Standard Specifications – 2016
Description
This work shall consist of the furnishing and erecting of bridge approach rail at the required location in conformity with the
design shown on the plans or as ordered.
Designations will follow the classifications listed in 563.1.2.
Materials
Materials shall conform to 563.2.
The material requirements of Section 606 shall apply for W -beam guardrail, thrie -beam guardrail, or tubular thrie -beam
guardrail. Construction Requirements
Fabrication and construction shall comply with the pertinent provisions of 563.3 and 606.3 .
Method of Measurement
Bridge approach rail, of the type specified, will be measured by the unit.
Basis of Payment
Bridge approach rail, of the type specified will be paid for at the Contract unit price complete in place.
Pay items and units
565.12Bridge Approach Rail, ST Unit
565.22Bridge Approach Rail, T2 Unit
565.23Bridge Approach Rail T3 Unit
565.24Bridge Approach Rail, T4 Unit
565.72Bridge Approach Rail F, (2-bar) Unit
565.73Bridge Approach Rail F, (3-bar) Unit
565.81Rehabilitation of Bridge Approach Rail Unit
565.XX2 Bridge Approach Rail “ Type” (Steel Posts) Unit
BRIDGE RAIL in other states
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