605 METAL TRAFFIC BARRIERS

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605.01 DESCRIPTION
Furnish and Install metal traffic barriers.
605.02 MATERIALS
Refer to Sections 606.02, 609.02, 701.02, 705.02, 708.02, 709.02, and the following:
Common Borrow       916.01
W-Beam/Thrie-Beam       918.01
Steel Posts       918.02
Traffic Barrier Hardware       918.03
Timber Posts       918.04
Wood Offset Blocks       918.04, grooved or routed
Wire Rope       918.05
Rub Rail       A36, Galvanized, A123
Galvanizing Repair       465.03.05
Composite Offset Blocks       As approved, grooved or routed
Reflective Delineators       As approved
605.03 CONSTRUCTION
605.03.01 Post Installation
(a) Install posts plumb to the specified depth. Drive posts, unless otherwise directed, using a method that will not batter or distort the posts.
(b) If posts are not driven, dig holes of sufficient diameter to allow tamping of the backfill and install the posts as follows.
When rock is encountered, drill a 12 in. diameter hole to the specified footing depth, or drill into the rock at least a depth of 24 in., whichever is less.
When the 24 in. depth is reached prior to the specified footing depth, discontinue drilling, and cut the post to the appropriate length and paint the cut edge with galvanizing repair paint.
Backfill with approved common borrow, CR-6, or other material as directed. Place backfill in horizontal layers not exceeding a depth of 6 in. and thoroughly compact. Do not use concrete or grout material.
(c) Do not install posts into pavement.
(d) Remove unsuitable materials and restore areas to match adjacent turfgrass, asphalt millings or grindings, or crusher run aggregate CR 6.
(e) Align posts to within 1/4 in. of line and grade before installing rail.
605.03.02 Rail Assembly. Install rail elements according to the Book of Standards. Ensure a smooth and continuous installation, with laps in the direction of traffic flow. Ensure that all bolts are tight.
605.03.03 Offset Blocks. Install either wood or composite offset blocks with grooves or router lines which prevent the blocks from rotating.
Do not mix different types of composite blocks. Do not mix composite and wood blocks.
605.03.04 Grading Adjustment. When grading adjustment is required for installation of traffic barrier, adjust the grading using topsoil, crusher run aggregate CR-6, asphalt millings or grindings, subsoil, common borrow, or other approved materials as follows:
(a) Non-Landscaped Areas. For grading adjustment, install common borrow or subsoil as specified in 204.03.04 or 701.03.04, to the grade that is 4 in. below the final grade. Complete the grading adjustment with crusher run aggregate CR-6 or asphalt millings or grindings.
(b) Landscaped Areas. For grading adjustment up to 8 in. depth, complete the adjustment with topsoil as specified in Section 701, and perform sodding or seeding as described in (c) below. For surface adjustment more than 8 in. depth, the use of aggregate fill is prohibited. Install subsoil or approved common borrow as specified in Section 204 or Section 701, to the grade that is 4 in. below the final grade. Complete the adjustment with topsoil as specified in Section 701, and perform sodding or seeding as described in (c) below.
(c) Sodding or Seeding. Immediately after placing topsoil, perform Turfgrass Sod Establishment as specified in Section 708. Alternatively, perform Turfgrass Establishment as specified in Section 705 and install Type A or Type E Soil Stabilization Matting as specified in Section 709.
605.03.05 Traffic Barrier Reflective Delineators. Install reflective delineators as specified.
605.03.06 Remove and Reset Existing Traffic Barrier. Replace severely corroded or damaged individual traffic barrier panels as directed.
When removing and resetting an entire run or a portion of a run of traffic barrier, replace any steel offset brackets with either wood or composite offset blocks as specified in Section 605.03.03.
When removing and resetting an entire run, use 8 in. offset blocks. When removing and resetting only a portion of a run, match the offset blocks of the existing run as directed.
Ensure that the holes in the blocks match the holes in the existing posts.
When resetting the rail, measure the height of the rail to ensure that it conforms to the current height shown in the Book of Standards. Raise existing rail and posts that do not conform to the current height without damaging the traffic barrier, posts, offset blocks, or surrounding area. Unless otherwise directed, maintain the existing offset distance from the edge of the roadway.
After replacing traffic barrier panels, restore the disturbed areas as specified in 605.03.04.
605.03.07 Remove and Reset Existing Median Traffic Barrier. Refer to 605.03.06.
605.03.08 End Treatments. As specified in Section 606.
605.03.09 Removal and Disposal of Traffic Barrier. Assume all responsibility and make every effort to recycle or stockpile for noncontract use all existing metal components of traffic barrier. Submit written certification of material recycled or stockpiled to the Administration upon completion, including date, time, materials, measurement, and other pertinent information. After removal and disposal of traffic barrier, restore the disturbed areas as specified in 605.03.04.
605.04 MEASUREMENT AND PAYMENT
Payment will be full compensation for all driving, excavating, drilling, traffic barrier rail elements, offset blocks, traffic barrier posts, backfill, compaction, and for all material, labor, equipment, tools, disposal fees, and incidentals necessary to complete the work.
605.04.01 Traffic Barrier W-Beam Using 6 Foot Post or 8 Foot Post will be measured and paid for at the Contract unit price per linear foot.
605.04.02 Traffic Barrier W-Beam Panel. When a bottom W-beam panel is specified for the Traffic Barrier W-Beam item, it will be measured and paid for at the Contract unit price per linear foot.
605.04.03 Traffic Barrier W-Beam Median Barrier will be measured and paid for at the Contract unit price per linear foot.
605.04.04 Traffic Barrier W-Beam Median Barrier with Bottom Panel will be measured and paid for at the Contract unit price per linear foot.
605.04.05 Traffic Barrier Thrie-Beam will be measured and paid for at the Contract unit price per linear foot.
605.04.06 Traffic Barrier Thrie-Beam Median Barrier will be measured and paid for at the Contract unit price per linear foot..
605.04.07 Replacing 6 foot or 8 foot posts, installing additional 6 foot or 8 foot posts, splice joints, and replacing W beam and thrie-beam panels will be measured and paid for at the pertinent Contract unit price.
605.04.08 Traffic Barrier Reflective Delineators will be measured and paid for at the Contract unit price per each.
605.04.09 Remove and Reset Existing Traffic Barrier W Beam or Thrie Beam will be measured and paid for at the Contract unit price per linear foot.
605.04.10 Remove and Reset Existing Median Traffic Barrier W Beam or Thrie Beam will be measured and paid for at the Contract unit price per linear foot.
605.04.11 Remove and Reset Existing Median Traffic Barrier W Beam with Bottom Panel will be measured and paid for at the Contract unit price per linear foot.
605.04.12 Removal and Disposal of Existing Traffic Barrier W Beam or Thrie Beam will be measured and paid for at the Contract unit price per linear foot, including all costs required for disposal and certification. Certification of material recycled or stockpiled will be required prior to payment.
605.04.13 Grading adjustment using topsoil and subsoil will be measured and paid for at the Contract unit price as specified in 701.04.
605.04.14 Grading adjustment using CR-6 crusher run aggregate, or asphalt millings or grindings, will be measured and paid for as specified in 606.04.06.
605.04.15 Grading adjustment using common borrow will be measured and paid for at the contract unit price per cubic yard as specified in 203.04.
605.04.16 Grading adjustment using other approved materials will be measured and paid for as pertinent items.
605.04.17 Type A Soil Stabilization Matting or Type E Soil Stabilization Matting will be measured and paid for at the Contract unit price per square yard.
605.04.18 Turfgrass Sod Establishment or Turfgrass Establishment will be measured and paid for at the Contract unit price per square yard.