SECTION 913 – GUIDE RAIL, FENCE, RAILING, AND BOX BEAM
913.01 Beam Guide Rail
913.01.01 Rail Element
Fabricate rail element according to AASHTO M 180, Class A, Type I in Table 2. Ensure that the weight of the zinc coating conforms to AASHTO M 180, Type I in Table 1. Submit a certification of compliance as specified in 106.07.
913.01.02 End Treatments
For 27 1/4 inch high guide rail, use non -gating guide rail end treatment that is NCHRP 350 test level 3 (TL -3) tested, approved, and are listed on the QPL. For 31 inch high Midwest Guardrail System (MGS), use non -gating guide rail end treatment that is MASH test level 3 (TL-3) tested, approved, and are listed on the QPL. Submit a certification of compliance as specified in 106.07.
913.01.03 Posts and Blockouts
For steel posts and blockouts, use structural steel conforming to ASTM A 709, Grade 36, that is galvanized according to ASTM A 123. Use wood timber blockouts and posts as specified in 915.01. For 27 1/4 inch high guide rail, use synthetic routed blockouts that are NCHRP 350 test level 3 (TL -3) tested, approved, and are listed on the QPL. Ensure that the name of the manufacturer and model number are stamped on each blockout and that the blockouts are of the same material and dimensions as the spacers that were NCHRP tested. For 31 inch high Midwest Guardrail System (MGS), use sy nthetic routed blockouts that are MASH test level 3 (TL -3) tested, approved, and are listed on the QPL. Ensure that the name of the manufacturer and model number are stamped on each blockout and that the blockouts are of the same material and dimensions as the spacers that were MASH tested. Provide certifications of compliance, as specified in 106.07.
913.01.04 Rub Rail
For rub rail, use steel channels or bent plate of structural steel conforming to ASTM A 36 and galvanized according to ASTM A 123. Submit a certification of compliance as specified in 106.07.
913.01.05 Miscellaneous Hardware
Ensure that connections or splices, nuts, bolts, washers, and plates conform to AASHTO M 180, except as follows:
1.If high-strength bolts are shown on the Plans for bridge guide rail, use high -strength bolts, nuts, and washers conforming to ASTM A 325, Type I, and galvanized according to ASTM A 153.
3.Use plates for guide rail on bridges and buried guide rail terminals conforming to ASTM A 36 and galvanized according to ASTM A 123. Submit a certification of compliance as specified in 106.07. The ME may randomly inspect hardware for quality assurance.
913.02 Fence
913.02.01 Chain-Link Fence
Ensure that the materials for chain -link fence conform to AASHTO M 181. Submit certifications of compliance, as specified in 106.07, for fence materials. Attach mill certification to the certification of compliance.
913.02.02 Caution Fence
Ensure that the materials for caution fence conform to the following:
1.Fabric. Fabricate the fabric for plastic caution fence from HDPE with a min imum tensile strength of 5,000 pounds per square inch when tested according to ASTM D 648. Use fabric that is blaze orange in color that matches FED-STD-595B color chip No. 38915 and is ultraviolet stabilized.
2.Posts. Use posts made of high carbon steel with a flanged leg channel section or flanged leg U -bar section having a uniform thickness of metal of not less than 1/8 inch. Ensure that the posts weigh at least 2 pounds per linear foot, exclusive of ground plate, and are designed to be easily driven into the ground. Equip each post with at least 11 riveted lugs. Do not equip posts with punched or welded lugs. Galvanize posts.
913.02.03 Snow Fence
Ensure that the materials for snow fence conform to the following:
1.Wires. Use wires of a galvanized stay-cable type, with a diameter of not less than 12 1/2 gauge.
2.Wooden Pickets. Use unpainted, wooden pickets made from cedar, spruce, maple, or other satisfactory species of wood. Ensure that the pickets are free from knot s with a diameter greater than one-half of the width of the picket.
3.Posts. Use posts as specified in 913.02.02.2. Submit certifications of compliance, as specified in 106.07, for fence materials.
913.03 Bridge Railing
913.03.01 Steel Railing
Fabricate steel bar bridge railing and steel railing components of combination railing system from structural steel as specified in 906.01 and 906.04. For non-traffic steel railing, construct welds according to the requirements of AWS D1.1 Structural Welding Code. Use bolts and bolting materials as specified in 908.01. When specified, paint as specified in
906.06 or galvanize as specified in 912.02.01. Submit certifications of compliance, as specified in 106.07, and copies of
mill certifications.
913.03.02 Aluminum Railing
Fabricate aluminum railing from aluminum components as specified in Table 913.03.02-1. Construct welds according to the requirements of ANSI/AWS D1.2 Structural Welding Code - Aluminum. Use bolts and bolting materials as specified in 908.01. When specified, paint as specified in 906.06. Submit certifications of compliance, as specified in 106.07, and copies of mill certifications.
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 524–525 of 651. View official source ↗