704Guardrail

704.01 DESCRIPTION. Furnish and construct highway guardrail in accordance with these specifications, plan details, the manufacturer’s recommended procedures, and other requirements as directed by the engineer. 704.02 MATERIALS. Materials shall comply with the following sections and subsections. Portland Cement Concrete (Class A1) Section 901 Reinforcing Steel Section 1009 Metal Beam Guardrail 1010.09 Guardrail Posts and Blockout 1010.10 Guardrail Hardware 1010.11 Wire Rope and Fittings for Highway Guardrail 1010.12 Welding 815 704.03 GENERAL CONSTRUCTION REQUIREMENTS. 704.03.1 Posts: Align posts and set plumb. When driving of posts is permitted, do not damage posts. Backfill post holes with acceptable material placed and compacted as directed. When posts are to be placed within existing surfaced areas, replace surface material as shown on the plans. 704.03.2 Rail Elements: Erect rail elements in a manner resulting in a smooth, continuous installation. Tighten all bolts, except adjustment bolts. Furnish bolts of sufficient length to extend beyond nuts. Field drill or punch holes for special details when approved. Repair damaged galvanized surfaces and drilled holes in accordance with 811.08. 704.03.3 Anchor Blocks: Reinforced concrete blocks for anchoring guardrail to existing bridge ends shall meet the requirements of Section 805 and Section 806. Use Class A1 concrete complying with Section 901. Remove portions of existing bridge railings and drill holes into existing railings when required without damaging the remaining railings. Satisfactorily repair damage to the existing bridge due to operations at no additional cost to the Department. Dispose of removed materials of in accordance with 202.02. 704.03.4 Guardrail End Treatments: All guardrail end treatments shall have been successfully crash tested in compliance with the crash test requirements of the National Cooperative Highway Research Program (NCHRP) Report 350 or the AASHTO Manual for Assessing Safety Hardware (MASH) at a Test Level 3 (TL-3) unless noted otherwise on the plans. Do not use end treatment systems not in compliance with this requirement on any Department project. The contractor shall select the end treatment system from the Approved Materials List unless noted otherwise on the plans , but shall not use a combination of such end treatment systems on the same project. The contractor shall submit the selected system to the Project Engineer, which includes the system name, system drawings, the manufacturer of the end treatment system, and all necessary documentation to substantiate that the end treatment is in compliance with the NCHRP 350 or MASH requirement for review. The selected system shall not be installed until the system submittal has been reviewed by the Project Engineer. The contractor shall install all components of the guard rail end treatment system such as posts, blocks, and hardware in accordance with the drawings and the manufacturer’s recommendations. Under no circumstances shall any component of the guard rail end treatment system be modified without written approval. All end treatments shall bear a label indicating the manufacturer and exact product name of the end treatment along with its assigned NCHRP or MASH test level. This label shall resist weathering and shall be permanently affixed to the railing in such a way as to be readily visible. Furnish all end treatments with retroreflective sheeting at the terminal end as shown on the plans. 704.04 MEASUREMENT. Quantities of guardrail, anchor sections, end treatments, and transitions for payment will be the design quantities in linear feet shown on the plans and adjustments thereto. Design quantities will be adjusted if the engineer makes changes to adjust to field conditions, if plan errors are proven, or if design changes are made. Design quantities of single faced guardrail are based on plan length along the face of rail between end posts, exclusive of openings, and plan length of end sections. Design quantities of double faced guardrail are based on plan length between end posts along centerline of posts, exclusive of openings, and plan length of end sections. Design quantities of trailing end and anchor sections are based on plan length along the face of rail. Guardrail anchor blocks and end treatments will be measured per each unit furnished and installed. 704.05 PAYMENT. Payment for guardrail, anchor sections, anchor blocks, end treatments, and transitions will be made at the contract unit prices per linear foot, which include drilling of holes in existing concrete for reinforcing steel dowels, concrete, and reinforcing steel and all labor, materials, equipment, tools, and incidentals necessary to complete the work. Payment adjustments for portland cement concrete in accordance with Section 901 will not apply. Payment will be made under: Item No. Pay Item Pay Unit