611.01 Description
This work is furnishing and installing cattle guards or removing and resetting cattle guards.
611.02 Materials
611.02.1 Concrete
Furnish air-entrained hydraulic cement concrete in accordance with Section 551 for precast bases.
611.02.2 Steel
Furnish reinforcing steel in accordance with Subsection 711.01. Furnish low-alloy weldable steel in accordance with AASHTO M 270 Grade 36 (250 MPa) or ASTM A572, Grade 42 (290 MPa) requirements for crossbars. Furnish other steel in accordance with Section 711.
611.02.3 Paint
Furnish paint in accordance with the following Subsection requirements: Aluminum Epoxy (Two Coats) ...................... 710.02(B)(2) Aluminum Paint (Finish Coat) ....................... 710.02(B)(1) Shop (Prime Coat) ....................................... 710.02(B)(6)
611.02.4 Cattle Guards
Furnish standard prefabricated cattle guards in accordance with the following requirements: • HS-20 (AASHTO M 518) live loading. • The Detailed Drawings; and • Subsections 556.03.2 and 556.03.3. Submit all fabrication drawings for review before fabrication and footing elevations are set.
611.03 Construction Requirments
611.03.1 Excavation
Excavate cattle guard foundations to the specified depth allowing space for formwork. Complete and compact earth fills in accordance with Section 203 before excavating for the cattle guard foundation.
611.03.2 Placing Concrete Bases
Furnish precast concrete bases in accordance with Section 554 and the Detailed Drawings. Construct stringer bearing surfaces to provide full bearing under each stringer. Bushhammer uneven surfaces to provide even bearing.
611.03.3 Placing Cattle Guards
Fasten the metal structure to the base as specified. Attach the metal wings to the cattle guard and to the fence as shown in the Detailed Drawings. All welding must meet the requirements of Subsection 556.03.10 and Section 624. Backfill and clean up around the completed structure.
611.03.4 Painting
Apply one shop coat of primer to all metal parts. Apply remaining coats in the shop or field. 611 – CATTLE GUARDS 2020 EDITION V5.1 611-2 Perform all painting in accordance with Section 612. Re-paint damaged painted surfaces at Contractor expense.
611.03.5 Resetting Cattle Guards
Dismantle and reset existing cattle guards at the locations specified in the contract.
611.04 Method of Measurement
New and reset cattle guards are measured by the unit, including the concrete bases, excavation and backfill.
611.05 Basis of Payment
Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit New Cattle Guard Each Reset Cattle Guard Each
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