DESCRIPTION
617.01.01 General. This work consists of furnishing and constructing cattle guards and cattle guard wings.
Alternate designs of precast cattle guards may be submitted for approval. Designs approved by the Department’s Headquarters Structural Design Division may be substituted for the designs indicated. MATERIALS
617.02.01 General. Materials shall conform to the following Sections and Subsection:
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Reinforcing Steel ................................ .................................................................................................................................... Section 505 Steel Structures ..................................................................................................................................................................... Section 506 Painting ................................ .................................................................................................................................................. Section 614 Paint ................................ ................................ ...................................................................................................................... Section 714 Hardware ................................................................................................................................................................ Subsection 718.03.04 Portland cement concrete shall be Class A or Class AA, unless otherwise provided. All hardware shall be galvanized steel. All lumber and timber shall be Douglas Fir, No. 2 joist and plank or No. 1 structural posts and timbers. Any commercial grading rules that will provide material of an equal or greater stress values may be used. CONSTRUCTION
617.03.01 Earthwork. Structure excavation and backfill shall conform to Sections 206 and 207.
617.03.02 General. Construct cattle guards and cattle guard wings according to the details shown on the plans.
Precast cattle guards may be substituted for steel cattle guards. Steel cattle guards may not be substituted for precast cattle guards. Concrete and metal reinforcement construction shall conform to Sections 502 and 505. Weld steel member connections in conformance with Section 506. Do not paint structural steel for cattle guards. Paint steel cattle guard wings according to Section 614.
617.03.03 Timber Wings and Timber Foundations. Give the wing posts, wheelguards, and foundation
timbers a preservative treatment conforming to Section 718. Do not paint treated timber and lumber. Paint all untreated lumber and timber according to Section 614. Workmanship shall be first class throughout. Frame true and exact. Drive nails and spikes with just sufficient force to set the heads flush with the surface of the wood. Avoid deep hammer marks in wood surfaces. Carefully handle treated timber without sudden dropping, breaking of the outer fibers, bruising, or penetrating the surface with tools. Perform all cutting, framing, and boring of treated timbers before treatment insofar as is practicable. Cover all cuts in treated timbers, and all abrasions, after being carefully trimmed, with an approved preservative. Treat all bolt holes bored after treatment, with an approved preservative. Bore holes for machine bolts with a bit of the sam e diameter as the bolt. Bore holes for lag screws with a bit not larger than the body of the screw at the base of the thread. 617 CATTLE GUARDS Use a washer of the size and type specified under all bolt heads and nuts which would otherwise come in contact with wood. Count ersink bolts whenever smooth faces are required. METHOD OF MEASUREMENT
617.04.01 Measurement. Cattle guards will be measured by the each.
Cattle guard wings will be measured by the each where wings are installed on existing cattle guards . BASIS OF PAYM ENT
617.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. The cost of cattle guard wings shall be included in t he contract unit price for cattle guards, however, where wings alone are required, they will be paid for at the contract unit price for cattle guard wings. Payment will be full compensation for the work prescribed in this Section. Payment will be made und er: Pay Item Pay Unit (size) Steel Cattle Guard ................................................................................................................................................................... Each (size) Precast Cattle Guard ............................................................................................................................................................... Each Cattle Guard Wings ........................................................................................................................................................................... Each SECTION 618 GUARDRAIL DESCRIPTION
618.01.01 General. This work consists of constructing guardrail systems , furnishing and installing guardrail
terminals, and reconstructing guardrail systems. MATERIALS
618.02.01 General. Material shall conform to the following Sections:
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Reinforcing Steel ................................ .................................................................................................................................... Section 505 Guardrail Materials ................................................................................................................................................................. Section 720 Use wood or metal posts. Use the same type of post, where there are optional post types, for the e ntire project. Give wood posts and blocks a preservative treatment by pressure processes after fabrication according to Section 718. Other approved products for guardrail offset blocks may be used in lieu of wood blocks. The optional products approved for use as guardrail offset blocks are available from the manufacturers listed in the QPL. Rail members having a radius of curvature of 46 m (150 ft) or less shall be fabricated with the required radius. Field bending will not be allowed. Stencil the radius of curvature on the back of each section in numerals 60 mm (2.5 in.) in height.
a.Guardrail Terminals. Flared guardrail terminals shall be the type for installations which flare to 1.2 m (4 ft) away from the shy line parallel to the travel lanes. Tangential guardrail terminals shall be the type for installations parallel to the travel lanes. Manufacturers of the appropriate guardrail terminals are listed in the QPL. Select a product for flared guardrail terminals and install that same product at all flared guardrail terminal locations. Select a product for tangential guardrail terminals and install that same product for all tangential guardrail terminal locations. Submit the manufacturer’s shop drawings, foundation details, installation recommendations, and any other pertinent information for the guardrail terminals. Receive approval for the exact model of guardrail terminal proposed, prior to installation. Furnish and install the units with all parts and materials necessary for them to perform as designed.
b.Trailing End Anchors. The 19 mm (3/4 in.) cable and fittings shall conform to Subsection 720.03.03. Use cable clips or a swaged fitting and clevis to attach the cable to the anchor rod. Cable clips shall be commercial quality drop forged galvanized steel. Machine the swaged fitting from hot -rolled bars conforming to AISI C1035, and anneal suitably for cold swaging. Galvanize the swage fitting before swaging. Drill a lock pin hole to accommodate a 6 mm (1/4 in.), plated, spring steel pin t hrough the head of the swage fitting to retain the stud in proper position. Stamp the manufacturer’s identifying mark on the body of the swage fitting. The 25 mm (1 in.) diameter threaded stud shall conform to ASTM A449 after galvanizing. Before galvanizi ng, mill a 10 mm (3/8 in.) slot for the locking pin in the stud end. The swaged fittings, stud and nut assembly shall develop a minimum breaking strength of 190 kN (21.4 tons). The clevises shall be drop forged galvanized steel and shall develop a minimu m breaking strength of 190 kN (21.4 tons).
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 363–364 of 610.