A06_BLM-NM_RPFO_CATTLEGUARD_SPECS.pdf
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- BLM-NM RPFO WELDED STEEL CATTLEGUARDS
- Solicitation number
- 140L1726Q0046
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RPFO Cattleguard Supply Specifications – Section 02879: Welded Steel Cattle Guards
This specification document outlines the requirements for furnishing AASHTO HS20-44 rated welded steel cattle guard grids with bases and wings, excluding cleanouts. The cattle guards must be designed and fabricated using new materials only, specifically hot-rolled structural steel sections conforming to ASTM A 36/36M or AASHTO M 183, cold-formed rails per ASTM A 242/242M (welded with E 7015 or E 7016 electrodes), structural tube sections per ASTM A 500 Grade B or ASTM A 618 Grade 2, and steel pipe per ASTM A 53 Schedule 80. All welding shall be accomplished with AWS E 7018 electrodes (except cold-formed rails) and must conform to AWS D1.1 standards with secure, complete welds along both edges of cross pieces and frame joints. Welders must meet minimum qualifications for electrodes up to E 7018 and steel thickness of 1/8 to 3/8 inch per AWS D1.1, Section 5.
The cattle guard foundations and bases must be engineered to match the load-bearing capacity of the grids as shown on approved drawings or engineer-stamped submittals. Fabrication requires all-welded construction with structural steel cleaned per SSPC SP-6, followed by a prime coat of lead-free, zinc-rich rust-inhibitive alkyd metal primer (minimum 1-1/2 mils dry-film thickness) and a finish coat of oil alkyd-enamel gloss paint in Federal Safety Yellow or color 13655 (minimum 3 mils DFT applied in two applications). Weld quality must be visually acceptable per AWS D1.1, AWS B1.10, and AWS WI CH16, with any unacceptable welds subject to repair, replacement, or rejection of the entire piece. Manufacturers must submit descriptive data with design calculations; alternate designs require three copies of detailed engineering drawings certified by a registered engineer. The specification notes that AASHTO HS-20 rated constructions with wings, bases, and no cleanouts do not need to be constructed exactly as BLM drawings show, provided Safety Yellow paint conforms to ANSI Z535.1-2011.
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RPFO Cattleguard Supply Specs
WELDED STEEL CATTLE GUARDS
02879 - 1
SECTION 02879
PART 1: GENERAL
1.1 SUMMARY
A. Section Includes: Furnishing AASHTO rated HS20 cattle guard grids without cleanouts, but includes bases and wings.
1.2 DESIGN REQUIREMENTS
A. Size: Design cattle guards to meet AASHTO HS20-44 load standards.
B. Foundations: Cattle guard foundations shall be engineered to match the load bearing capacity and attached drawing and grids and capable of attaching to grid.
1.3 SUBMITTALS
A. Manufacturer's Literature: Submit one copy of the manufacturer's descriptive data including design data for commercial cattle guard grids.
B. Alternate Design: Submit three copies of detailed engineering drawings, material specifications and fabrication instructions. Alternate Designs:
Shall be furnished with design calculations and be certified by a Registered Engineer that they meet design requirements.
1.4 QUALITY ASSURANCE
A. Welder Qualifications: As a minimum, the welder shall meet the qualifications for: Electrodes up to and including E 7018 according to AWS D1.1, Section 5; Steel thickness 1/8 to 3/8 inch (3 to 10 mm); fillet, groove, low-hydrogen welding; or meet code qualifications for structural plate and rolled structural shapes.
PART 2: PRODUCTS
2.1 MATERIALS
A. General: Shall be constructed of materials as shown on the drawings and described in these specifications. Design loading of grids and dimensions shall be as shown on the drawings. New material shall be used in the fabrication of cattle guards. (NOT used oilfield pipe)
B. Hot-rolled structural steel sections: ASTM A 36/36M or AASHTO M 183.
02879 - 2
C. Cold-formed rails: ASTM A 242/242M. This type rail shall be welded with
E 7015 or E 7016 electrodes.
D. Structural tube sections: ASTM A 500, Grade B, Copper Steel or ASTM A 618, Grade 2.
E. Steel pipe: ASTM A 53, Schedule 80
F. Crane rails: ASCE 60 crane rail.
G. Zinc-plated connectors, bolts and nuts: ASTM A 307, or SAE Grade 8: SAE
J 429.
H. Anchor clips: Shall be furnished loose and field bolted.
I. End Wings: Shall be as shown on the drawings.
J. Paint: Color shall be Federal Safety Yellow or match color no. 13655, Fed.
Spec. TT-C-595. Cattle guards shall be painted after fabrication.
2.2 FABRICATION
A. Welding: Shall be accomplished with AWS E 7018 electrodes, except for cold-formed rails.
B. Steel Cattle Guard Grids: Steel grids shall be all-welded construction.
Welds shall be secure and complete along both edges of cross pieces and at joints in the frame, and shall conform to AWS D1.1.
C. Paint: Safety Yellow (ANSI Z535.1-2011). Structural steel shall be cleaned according to SSPC SP-6. Cattle guard grids and end wings shall each receive a prime and finish coat. The prime coat shall be a lead free, zinc-rich, rust-inhibitive alkyd metal primer. Minimum thickness shall be 1-1/2 mils (0.05 mm ) dry-film thickness (DFT). The finish coat shall be an oil alkyd-enamel, gloss paint. Minimum thickness shall be 3 mils (0.10
mm) DFT, applied in two applications.
D. Cattle Guard Foundations: Foundations or bases shall be constructed to match the load bearing capacity of the grids as specified and shown on the drawings or engineer stamped submittals that have been approved.
2.3 SOURCE QUALITY CONTROL
A. Material Marking: Material to be used in the fabrication process shall be labeled, marked, or otherwise segregated from differing material.
B. Weld Inspection: The quality of the weld shall be "acceptable" under the visual requirements of AWS D1.1, AWS B1.10, and AWS WI, CH16. Unacceptable
02879 - 3 welds or defects in the welds as detected by visual inspection or by radiographic, penetrant dye, or magnetic particle techniques shall be repaired or removed and replaced by methods acceptable under the applicable AWS welding codes, or the entire piece may be rejected by the Contracting Officer. Repaired or replaced welds shall be re-inspected by the applicable nondestructive testing method.
*ASSHTO rated HS-20 constructions grid with wings and bases and no cleanouts, does not have to be constructed exactly as BLM drawing shows.* Safety Yellow paint to conform to ANSI Z535.1-2011.
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