2554Traffic Barriers

2554.1DESCRIPTION

This Work consists of installing guardrail, barrier, end treatments, transitions , and other devices that protect or prohibit traffic at the locations shown on the Plans or as directed by the Engineer. This Work also consists of installing posts and guide posts, and resetting existing barriers.

2554.2MATERIALS

Flanged Channel Sign Post D Steel Beams Provide W-beam, thrie-beam rail elements, posts, blockouts, soil plates, reducer sections, and end treatments meeting the requirements of the Task Force 13 Guide to Standardized Highway Barrier Hardware. E Hardware and Fittings .............................................................................................. 3381 & 3382 F Paints Provide paints as required by the Contract.

Provide concrete for anchor blocks and bearing blocks with a compressive strength of at least 2,750 psi within 14 Calendar Days. The Department does not require air entrainment. Anchorage assemblies consist of the anchor and the fittings required to connect the anchor to the end post. I Blockouts Composite or recycled material guardrail blockouts meeting the criteria of NCHRP 350 or MASH may be substituted for wood blockouts in the construction of Type 8307 and Type 8338 Plate Beam Guardrail systems. J Steel I Beam Post Delineators ................................... APL,Signing,Deliniation Devices-Permanent Anchorage assemblies consist of the anchor and the fittings required to connect the anchor to the end post. K Retroreflective sheeting ............................................................................................ 3352.2A.3.g

2554.3CONSTRUCTION REQUIREMENTS

A Excavation and Foundations The Contractor may dig post holes by hand or by using mechanical methods . Excavate to the depth necessary to place the rail elements at the specified height above the ground surface and meeting the requirements for post top and side alignment as shown on the P lans. In excavating for anchorages, ensure that anchorages bear on firm, undisturbed earth at the depth shown on the P lans. Use the natural soil at the bottom of the excavation as the foundation of line, guide, and permanent barricade posts. Tamp the natural soil at the bottom of the excavation to provide firm bearing . Found end posts and posts at intermediate guardrail anchorages on concrete bearing blocks . Provide concrete bearing blocks in the dimensions shown on the Plans. Firmly install concrete bearing blocks on a foundation prepared as required by the Contract. B Installing Posts Install posts of the size and type shown on the Plans, at the intervals shown on the Plans, and to the staked lines. Install posts with post tops within 3/8 inch of the elevation and grade shown on the Plans. Provide flanged channel steel Type B guide posts as Culvert markers weighing 2 pounds per foot in the lengths specified in 3401, “Flanged Channel Sign Posts.” Install Type B guide posts as shown on the Plans. Mechanically drive posts, unless precluded by the Plans or Engineer, without damaging the posts. Install and consolidate backfill Materials specified on the Plans, to maintain the post plumb and in the correct position. C Installing Barriers Install traffic barriers as shown in the Plans. Install proprietary barrier items as specified by the manufacturer. Drill holes in wood posts with the same diameter as the bolts or fittings used . In metal posts, drill holes for bolts or other fittings with a diameter no greater than 1/16 inch of the diameter of the bolt or fitting. Apply 2 coats of copper naphthenate or another preservative Material meeting the requirements

of AWPA M4 to field cuts in treated wood. Allow the first coat to dry for at least 2 hours before applying the second coat. The Contractor may leave field bored holes untreated. Provide bolts no longer than necessary to allow full nut contact after tightening at the overall Nominal depth of the assembled parts, plus reasonable allowance as required by the manufacturer for oversize components. Do not allow bolt ends to project beyond the rail contact face . The Contractor may cut off the excess length of bolt to within 9/16 inch of the nut head. C.1 Wire Rope (Cable Guardrail) Installations Except where cable clips are allowed by the manufacturer, wire wrap free ends of wire rope to prevent unraveling. At intermediate anchorages, space the cables to prevent contact between the separate cables. Install proprietary high-tension cable barriers as specified by the manufacturer. C.2 Steel Plate Beam Barriers Provide steel plate beam barriers including W-beam guardrail and Thrie-beam guardrail. If offset blocks are required by the Plans or the manufacturer, provide blocks made from treated timber or other Material as listed on the APL. Treat field cuts on treated wood in accordance with 2554.3C, “Installing Barriers.” Install rail and end sections to overlap the adjacent section in the direction of traffic. Install guardrail panels at the height shown in the Plans with a tolerance of 2 inches above and 1 inch below the Nominal height specified. Install end treatments as shown on the Plans and as staked in the field. Install proprietary end treatments as specified by the manufacturer. Install the guardrail end treatments and the guardrail concurrently. D Painting and Field Repairs Apply 2 coats of paint as shown on the Plans and in accordance with 2479, “Inorganic Zinc-Rich Paint System,” to steel above ground and not coated in accordance with 3406, “Structural Metal Fence Posts.” Perform other field repairs as recommended by the manufacturer. E Disposal of Surplus Excavated Material Dispose of surplus excavated Material at no additional cost to the Department and as approved by the Engineer. F Guardrail Blockouts Install composite or recycled guardrail blockouts as recommended by the manufacturer. G Delineation Install the I-beam delineators at the top of the I-beam post along the installation at a maximum spacing of 50 feet. Attach the I-beam delineators using adhesive only installation per manufacturers recommendation. Retroreflective sheeting on the delineator shall be at least 3 inches by 3 inches.

Retroreflective sheeting shall be the same color as the adjacent edge line and face traffic. When the barrier separates opposing traffic, retroreflective sheeting is required on both sides of the device.

2554.4METHOD OF MEASUREMENT

A Traffic Barriers The Engineer will measure traffic barriers of each design by length, to the nearest 1 foot. The Engineer will measure between the centers of end posts in each continuous section, including transitions . The Engineer will not deduct expansion assemblies from the measurement. B Guide Posts The Engineer will measure guide posts by the number of posts placed. The Engineer will separately measure each type as shown on the Plans. C Anchorage Assemblies The Engineer will measure anchorage assemblies by the number of assemblies installed. D End Treatments The Engineer will measure end treatments by the number of units of each type installed complete in-place.

2554.5BASIS OF PAYMENT

The Contract linear foot price for Traffic barrier, Design ___ includes the cost of providing barrier appurtenances and installing the barrier as shown on the P lans, except the Department will separately pay for anchorage assemblies and end treatments as shown in the Plans. The Contract each price for End treatment of each type includes the costs of providing and installing steel plate beam rail, posts, anchorage, offset blocks, hardware, and other related Materials . The Department will pay for Traffic barriers on the basis of the following schedule: Item No. Item Unit

2554.502 Guide Post Type ___ each

2 Install Guide Post Type ___ each

2 Anchorage Assembly -___ each

2 End Treatment-___ each

3 Traffic Barrier Design ___ linear foot

3 Permanent Barricades linear foot

3 Install Traffic Barrier Design ___ linear foot