A. In cases where no drawings or specifications are included in these bid documents, the full provisions of KYTC and AASHTO Standard Drawings and Specifications shall apply. B. General. The intent of this project is to replace the existing wood railing systems (including the pedestrian fall protection railing) with a brown, powder-coated W-Beam guardrail system. Provide guardrail systems and terminals that are MASH TL-2 rated (vehicle test speed at 44 mph). If proprietary systems, terminals, or crash cushions are required, install according to the manufacturer’s recommendations. Submit the installation manual, completed inspection checklists, and drawings from the manufacturer. C. Post Installation. Complete adjacent earthwork, aggregate placement and other roadway surfaces to line and grade as applicable before installation of guardrail posts. 1. Do not damage adjacent pavement, subsurface utilities, or drainage features during post installation. 2. Posts may be installed by either drilling or driving. Ensure posts installed by drilling have sufficiently sized holes to allow thorough compaction of backfill around each post. Backfill post holes in 6-inch lifts with approved material. Tamp and compact each lift. Replace posts damaged during driving operations. 3. Install the posts plumb and at the location, spacing, as required per standard details. If a post cannot be placed at its normal location due to a non-removable obstruction, an additional blockout may be added as approved. If the post cannot be offset with the addition of a blockout, the following options are allowed as approved: the post-in-rock detail, the long span detail, or the omission of a post upon approval. 4. Use typical post lengths for earthen installations. Do not change the post lengths or spacings in terminals or structure transitions based on standard drawings for terminal sections. 5. Posts mounted to bridges shall be anchored using bolted connections as follows. a. Each post shall be side-mounted to the concrete bridge structure with 4, corrosionresistant bolts. b. Bolts shall be epoxy-anchored using a Hilti HY-200 chemical anchor system or approved equal. Bolt embed length and hole preparation shall meet manufacturer's instructions to achieve a tensile strength of 5,000 lbs per bolt. c. Bolts shall be a minimum of 3/4" diameter unless it can be determined a small diameter bolt configuration is capable of achieving the desired tensile strength. d. Contractors may elect an alternative bridge attachment. Such alternatives must assure the minimum ultimate shear capacity of each connection is not less than 16,000 pounds.
