Section 4155.� Guardrail
4155.01���� general requirements.
Provide guardrail materials meeting the requirements for the type of guardrail specified. Provide guardrail posts of wood or steel as specified in the contract documents.
4155.02���� STEEL BEAM GUARDRAIL.
Comply with the following:
A.��� Rail elements, and terminal sections: meet the requirements of AASHTO M 180, Class A, 12 gauge (2.67 mm thickness), Type I, unless a greater thickness is required.
B.��� Bolts used to attach steel beam guardrail to concrete barrier or bridge rail: full-length galvanized and meet the requirements of ASTM A 325 or A 449, Type 1.
C.��� All other bolts: meet the requirements of ASTM� A 307, Grade A.
D.��� Washers used to attach steel beam guardrail to concrete barrier or bridge rail: meet the requirements of ASTM F 436.
E.��� All other washers: meet the requirements of ASTM F 844.
F.���� Nuts used to attach steel beam guardrail to concrete barrier or bridge barrier rail: heavy hex, Class 2B meeting the requirements of ASTM A 563, DH.
G.��� All other nuts: meet the requirements for ASTM A 563, Grade A, hex.
H.��� Galvanizing: meet the requirements of ASTM A 153, Class C F 2329 or B 695 Class 50, Type I Coating.
1.���� Meet the requirements of AASHTO M 30, Type I, Class A.
2.���� For high tension cable guardrail, meet the manufacturer's requirements.
Meet the requirements of AASHTO M 30, Type II, Class A.
Use posts sawed to the dimensions shown in the contract documents and meeting the requirements of Section 4164.
1.���� Use steel posts of the dimensions shown in the contract documents and that meet the requirements of ASTM A 36/A 36M structural steel.
2.���� Ensure bolt holes comply with Article 2408.03, S, 2.
3.���� Ensure steel posts and blocks are galvanized according to the requirements of ASTM A 123. Ensure galvanizing is done after fabrication and after all bolt holes have been drilled.
A.��� For wood blockouts, meet the requirements for wood posts.
B.�� Blockouts manufactured from alternate materials that have received FHWA acceptance for use on the National Highway System may be substituted for wood blockouts.
C.��� Ensure galvanizing is done after fabrication and after all bolt holes have been drilled.
4155.06���� miscellaneous itemS.
1.���� All miscellaneous items and materials are of the type, size, and dimension shown in the contract documents.
2.���� All metal parts are galvanized. However, any items or parts of items to be covered with 2 inches (50 mm) or more of concrete need not be galvanized.
3.���� All cable fittings required for cable guardrail installation are designed and fabricated so as to develop the full strength of a single cable or the multiple cable assembly, as applicable.
B.�� Internal threads of fasteners may be oversize, tapped after galvanizing.
C.�� When specific requirements are not stated in the contract documents, obtain the Engineer�s approval for anchor angles, anchor cable, turnbuckles, hook bolts, compensating devices, and any other fittings or special hardware which may be required.