505—GUARDRAIL AND W-BEAM MEDIAN BARRIERS

505.01 Description

This work shall consist of furnishing and constructing new guardrail and steel median barriers, installing reuseable guardrail in accordance with the plans and these specifications to the lines, grades, and toler - ances shown on the plans or as designated by the Engineer.

505.02 Materials

505.03 Procedures

The Engineer will not permit the use of more than one type of post on the installation of a continuous line of guardrail. The Contractor shall erect and align rail and elements in a manner that will result in a smooth, continu - ous, taut installation. Installation shall not result in the cross section of the rail or other elements being kinked or crimped. The Engineer will reject damaged rail or other elements. The Contractor shall replace rail and elements damaged prior to project acceptance at no additional cost to the Department. Guardrail delineators shall be installed in accordance with Section 702.03. The Contractor shall install spring cable end assemblies (compensating device) with a permanent match mark (hacksaw cut or file mark) on the bolt shaft or spring stop that shall be referenced to the outer as - sembly to denote the neutral position. Cable slack shall be eliminated by tightening the steel turnbuckle cable assembly at the end opposite the compensating device until the device is compressed 3-1/2 inches. Cables with a compensating device at each end shall be tightened such that neither end indicates less than the required tension. The assembly shall remain compressed for at least 2 weeks and then loosened, and each cable shall then be readjusted to the same required tension. The required tension shall be determined by tightening the turnbuckle at the end opposite the compensating device and displacing the match mark in accordance with the following: 665505.03 Ambient Air Temperature Match Mark Displacement Required Tension (degrees F) (in) (lb) 0-19 3 1/2 1,575 20-39 3 1,350 40-59 2 1/2 1,125 60-79 2 900 80-99 1 675 100-120 1 450 Anchor assemblies shall be installed on firm earthen foundations, backfilled with suitable material in 4- to 6-inch layers, and thoroughly compacted by tamping or rodding. Stress loads shall not be placed on anchor assemblies until concrete has cured at least 28 days or has attained a compressive strength of at least 3,000 pounds per square inch as determined from testing corresponding field control cylinders in accordance with Section 404.03. Nuts on anchor bolts shall be tightened to a snug tight fit as defined in Section 407.06 on beam guardrail anchors to ensure flush contact between the beam and concrete base throughout the length of the anchor assembly. Postholes, cracks, and voids in the shoulder resulting from driving posts or removing guardrail and unused or abandoned guardrail postholes shall be backfilled to the ground line with Department approved backfill material conforming to Section 305 placed in layers not more than 4 inches in height before tamping. Postholes, cracks and voids in paved or surfaced treated shoulders shall also be sealed with a fine asphalt plant mix no larger than SM-9.5A conforming to Section 211. Each layer shall be compacted by tamping. Wood posts shall be sawed to the dimensions shown on the plans within a tolerance of 2 percent for length and 1/4 inch scant. The Contractor may install posts by driving provided the equipment used is capable of installing posts without damaging them. The Engineer will reject damaged posts. Posts that are damaged shall be replaced by the Contractor at no additional cost to the Department. Posts shall be set plumb. Posts shall not be set with a variation of more than 1/8 inch per foot from vertical. If it is necessary to saw off the tops of wood posts to achieve a uniform and neat appearance, the amount sawed off shall be not more than 3 inches. Tops of sawed posts shall be brush coated with three heavy applications of the same type of preservative used in treating the posts. Each application of preservative shall be given sufficient time to penetrate the wood before the next application. Painting wood posts will not be required. Dirt and other foreign matter shall be removed after installation. Galvanized items shall be handled and stored in accordance with Section 233. After erection, the threaded portion of fittings with fasteners and cut ends of bolts and galvanized surfaces that have been abraded or damaged shall be repaired according to Section 233.03. The Contractor shall ensure that guardrail and barriers are kept clean during application of fertilizer, lime, tack coats, primer, or other material that cannot be readily cleaned from the guardrail or barrier after exposure. Guardrail shall only be constructed by a guardrail erector included on the Department’ s Approved List 12, who shall have a trained guardrail installer on the project during guardrail installation. For the 666505.03 purpose of this specification, a trained guardrail installer is a person who has a current certificate of training from a Department-approved guardrail installation training course. Posts shall be spaced in accordance with the Standard Drawings. The Engineer will permit longitudinal deviation of 3/4 inch providing the bolt holes in the guardrail, offset blocks, and posts can be properly aligned without alteration or force. The height of the guardrail shall be as shown in the standard drawings. On guardrail, nuts on bolts shall be tightened to a snug tight fit as defined in Section 407.06 to ensure full contact between the beam, offset block, and post. The Contractor shall submit two copies of the manufacturers’ recommended installation instructions and the FHWA NCHRP 350 or MASH approval letter for the type of new or salvaged guardrail end treatments being installed on the project to the Engineer at least 2 weeks before starting guardrail end terminal installation. All end terminals shall be from manufacturers on the Department’ s Approved List 12 and the Department’ s Approved List for NCHRP 350 or MASH products linked therein. New Type I Re-Directive Impact Attenuators and Guardrail Terminals shall be permanently identified by stamping or engraving in a location readily visible for inspection that is not susceptible to damage. The identifica - tion shall include Manufacturer, Date and Site of Manufacture, and Model Number. The Contractor shall field verify all materials and measurements required for installing Special Design Bridge Guardrail (BRGR) attachments prior to installation. The Contractor shall perform Special Design Bridge Guardrail work in accordance with the Standard Drawings for “Recommended Method for Attaching Guardrail to Bridge Rails” (BR-GR). If the Con - tractor needs to modify the method of attachment due to field conditions, the Contractor shall submit a request, with detailed sketches, to modify the method of attachment to the Engineer for review and approval by the Responsible Charge Engineer. The Engineer must preapprove all locations requiring drilling holes in concrete bridge railings and concrete fixed objects. Concrete spalls created by attachment of fixed object attachments (FOAs) or holes left by the removal of FOAs shall be repaired or filled with materials conforming to Section 218 to conform to the shape and dimensions of the existing design, to the satisfaction of the Engineer. Concrete repair will not be measured for separate payment but the cost thereof shall be considered incidental to the work.

505.04 Measurement and Payment

Guardrail will be measured in linear feet and will be paid for at the contract unit price per linear foot including hardware. Cable guardrail will be measured in linear feet from the point where the cable guardrail attaches to the run-on terminal treatment to the point where the cable guardrail attaches to the run-off terminal treatment, complete-in-place. Guardrail installed on a radius of 150 feet or less shall be shop-curved; will be measured in linear feet and will be paid for at the contract unit price per linear foot of radial steel beam guardrail or radial steel median barrier. W-beam median barriers will be measured in linear feet from center to center of end posts and will be paid for at the contract unit price per linear foot. Intermediate anchorage assemblies will be measured in units of each and will be paid for at the contract unit price per each. Terminal treatment for beam guardrail that terminates in back of the ditch line will be measured in linear feet along the regular guardrail section from center of end post (center of bolt group when guardrail is mounted flush to a structure) to the ditch line. The terminal section in back of the ditch line will be measured from the ditch line to center of end post. Terminal treatment for beam guardrail, cable guardrail, and steel median barriers terminating on the roadway side of the ditch line will be measured in units of each and will be paid for at the contract unit price per each. Fixed object attachments for guardrail will be measured in units of each and will be paid for at the contract unit price per each. This price shall include furnishing and installing guardrail connectors, rubrail, and additional posts with offset blocks and providing holes to facilitate attachment. 669505.04 Special design guardrail bridge attachments, BR-GR (Type) will be measured in units of each, for the type specified per attachment location and will be paid for at the contract unit price per each for the type specified. This price shall include, but not be limited to, furnishing and installing guardrail attachment type, posts, offset blocks, rub rail if required, delineators, and all hardware. Guardrail beam bridge rail will be measured in linear feet for “x” dimension when guardrail is extended the length of structure as directed by the Engineer or in accordance with the Special Design Guardrail Bridge Attachment, BR-GR, detail and will be paid for at the contract unit price per linear foot. Cable barricades will be measured in units of each and will be paid for at the contract unit price per each. This price shall include furnishing and installing posts, cable, signs, and padlocks. Guardrail beam will be measured in linear feet and will be paid for at the contract unit price per linear foot. This price shall include furnishing and installing new guardrail beam, delineators and all hardware. This price includes disassembling and reassembling guardrail designated for stiffening. Guardrail beam installed on a radius of 150 feet or less shall be shop-curved, will be measured in linear feet, and will be paid for at the contract unit price per linear foot of radial guardrail beam. Guardrail (Standard) (length) post will be measured in linear feet for the length of post for the guardrail standard specified and will be paid for at the contract unit price per linear foot. This price shall include furnishing and installing guardrail beam, posts, offset blocks and all hardware. Guardrail offset block, wood or composite will be measured in units of each and will be paid for at the contract unit price per each. This price shall include disconnecting existing offset block, furnishing and installing new offset block and all hardware to connect guardrail beam to posts. Guardrail post (length) will be measured in units of each for the length specified and will be paid for at the contract unit price per each. This price shall include furnishing and installing post and all hardware to guardrail beam and offset block. Remove existing guardrail will be measured in linear feet and will be paid for at the contract unit price per linear foot. This price shall include removing and disposing of existing beam or cable, posts, offset blocks, hardware, connectors, end terminals, and fixed object attachments; furnishing backfill material; backfilling postholes; and repairing damage to shoulders, curbing, curb backup material or concrete. Remove existing guardrail terminal will be measured in units of each and will be paid for at the contract price per each. This price shall include removing and disposing of existing guardrail terminals, including, but not limited to posts, offset blocks, hardware and the concrete anchor portion of terminals. This work shall also include furnishing backfill material, backfilling holes and repairing damage to shoulders, curbing, curb backup material or concrete and site restoration. Salvage existing guardrail will be measured in linear feet and will be paid for at the contract unit price of linear foot. This price shall include carefully removing, salvaging, transporting and storing existing guardrail beam, post, offset blocks, fixed object attachments and end terminals; disposing of existing hardware; furnishing backfill material; backfilling existing postholes; and repairing damage to shoulders, curbing, curb backup material or concrete. Salvage existing guardrail terminal will be measured in units of linear feet or each for the standard and type specified and will be paid for at the contract unit price per linear foot or each. This price shall include removing guardrail beam, posts, offset blocks, connectors, and end terminals; temporary 670505.04 storage; furnishing backfill material and backfilling holes; and repairing damage to shoulders, curbing, curb backup material or concrete and site restoration. This price shall also include removing and disposing of hardware and the concrete anchor portion of the terminals. Thrie beam guardrail will be measured in linear feet and will be paid for at the contract unit price per linear foot. This price shall include furnishing and installing thrie beam, posts, offset blocks, transition section delineators and all hardware. Install salvaged guardrail will be measured in linear feet for the standard specified and will be paid for at the contract unit price per linear foot. This price shall include transporting and installing salvaged guardrail posts, offset blocks, guardrail beam, and fixed object attachments; and furnishing and installing new delineators and new hardware. Salvaged guardrail installed on a radius of 150 feet or less shall be shop-curved; will be measured in linear feet and will be paid for at the contract unit price per linear foot of install salvaged guardrail. Install salvaged guardrail terminal (Standard) will be measured in units of linear foot or each for the standard and type specified and will be paid for at the contract unit price per linear foot or each. This price shall include transporting salvaged guardrail beam, post, offset blocks, installing salvaged guardrail beam, guardrail post, end terminals and offset blocks; and furnishing and installing reflective sheeting, delineators, concrete, and all hardware. Install salvaged guardrail beam will be measured in linear feet and will be paid for at the contract unit price per linear foot. This price shall include disassembling and reassembling guardrail designated for stiffening, storing and transporting salvaged guardrail beam, furnishing and installing delineators and all hardware. Salvaged guardrail beam installed on a radius of 150 feet or less shall be shop-curved; will be measured in linear feet and will be paid for at the contract unit price per linear foot of installed salvaged guardrail beam. Adjust existing guardrail beam will be measured in linear feet and will be paid for at the contract unit price per linear foot. This price shall include disassembling and removing guardrail beam and offset block(s) from the existing posts; drilling the existing posts and offset blocks; and reinstalling the offset blocks, guardrail beam, end terminals and associated hardware to the required height. When specified as a separate bid item, rub rail will be measured in linear feet for the type specified and will be paid for at the contract unit price per linear foot. This price shall include furnishing and installing the type of the rub rail specified, rub rail offset blocks, and all hardware. When specified as a separate bid item, guardrail terminal site preparation will be measured in units of each per site and will be paid for at the contract unit price per each site. The price for guardrail terminal site preparation shall also include clearing and grubbing; supplying, hauling, and placing fill material; benching existing slopes; and restoration of site including fertilizing and seeding. These prices shall also include excavating; backfilling holes; installing delineators; repairing damaged surfaces; furnishing, galvanizing, and erecting units; furnishing concrete anchor assemblies; and drilling or preboring. Bull nose barrier will be measured in units of each and will be paid for at the contract unit price per each. This price shall include furnishing and placing foundation soil tubes, concrete, polystyrene sheeting, welded wire fabric, posts, radial guardrail, offset blocks, hardware, and delineators. 671506.02 Guardrail height transition (Standard) will be measured in units of each and will be paid for at the Contract each price. This price shall include furnishing and placing posts, offset blocks, and all hardware necessary to fully install the height transition. Payment will be made under: ——————————————————————————————————————Pay Item Pay Unit—————— ————————————————————————————————Guardrail (Standard) Linear foot Radial guardrail (Standard) Linear foot Guardrail terminal (Standard and type) Linear foot or Each Intermediate anchorage assembly Each Median barrier (Standard) Linear foot Radial median barrier (Standard) Linear foot Median barrier terminal (Standard and type) Each Cable barricade (Standard) Each Fixed object attachment (Standard) Each Special design guardrail bridge attachment, BR-GR (Type.) Each Guardrail beam Linear foot Guardrail (Standard) (length) post Linear foot Guardrail offset block, (Wood or composite) Each Guardrail post (length) Each Remove existing guardrail Linear foot Remove existing guardrail terminal Each Salvage existing guardrail Linear foot Salvage existing guardrail terminal (Standard) Linear foot or each Thrie beam guardrail Linear foot Install salvaged guardrail (Standard) Linear foot Install salvaged guardrail terminal (Standard) Linear foot or each Install Salvaged guardrail beam Linear foot Adjust existing guardrail beam Linear foot Rub rail Linear foot Guardrail terminal site preparation (Standard) Each Bull nose barrier Each Guardrail end anchorage (Standard) Each Guardrail height transition (Standard) Each ——————————————————————————————————— ——— SECTION 506—RETAINING W ALLS

506.01 Description

This work shall consist of constructing rubble and hydraulic cement concrete retaining walls in accordance with the plans and these specifications and in conformity to the lines and grades shown on the plans or as established by the Engineer.

506.02 Materials