HIGH -TENSION CABLE BARRIER 628.02 597 627.06 BASIS OF PAYMENT The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.CONCRETE LONGITUDINAL BARRIER, DESIGN 1 Linear Foot [Meter]
B.CONCRETE LONGITUDINAL BARRIER END SECTIONS Each The Department will consider the cost of concrete and reinforcing steel used in the construction of longitudinal concrete barriers and end sections to be included in the contract unit price for the relevant pay items. HIGH -TENSION CABLE BARRIER
628.01 Description
This work consists of providi ng and installing complete sections of high -tension cable barrier or wire rope systems, including crashworthy end treatments, concrete socketed foundations, concrete anchors, and other appurtenances or hardware fittings.
628.02 Materials
Provide materials in accordance with the following sections, subsections, and external reference: Materials: Section, Subsection, or External Reference: Portland Cement Concrete, Class AA (≥4,000 psi) 701 Reinforcing Steel 723 Anchor Bolts and Nuts 724.02 Galvanizing (Bolts, Nuts and Washers) AASHTO M 232 Fittings (Steel Hardware) 732.01 Reflective Sheeting 733.05
A.Rigging Screws (Turnbuckle) Provide rigging screws (for tensioning the cable) that are galvanized after threading in accordance with ASTM A 153. For installations longer than 1,000 ft [300 m], include at least one rigging screw per 1,000 ft [300 m] strand. For installations 1,000 ft [300 m] or les s in length, include one rigging screw per strand near the center of the strand installation. Provide rigging screws that will develop minimum tensile loads without yielding to 36,800 lb [16.7 metric ton].
628.02 High -Tension Cable Barrier
598 B. Wire Ropes Provide galvanized, ¾ in [19 mm] dia meter, 3 × 7 wire rope in accordance with AASHTO M 30 Type I Class A coating, except with a breaking strength of at least 39,000 lb [17.7 metric ton]. The Department requires samples for proof testing to ensure the wire ropes and connections meet or excee d the minimum breaking load for the rope. Verify the wire rope is pre -stretched during manufacturing to ensure a minimum modulus of elasticity of 11,805,090 lb/in² [8,300 kg/mm²] after pre-stretching.
C.Threaded Terminals (swaged type) Provide shop or fi eld swaged threaded terminals. Ensure the threaded terminals are right -hand or left-hand threaded M24 X 3 pitch in accordance with ANSI B 1.13M. The Department will allow threaded terminals of stainless steel construction or galvanized after processing i n accordance with ASTM A 153. Ensure the body of the threaded terminal provides at least 6 in [150 mm] wire rope engagement depth. Ensure the fully fitted ropes develop a Minimum Breaking Load (MBL) of 36,800 lb [16.7 metric ton].
D.End Terminals Provide end terminals placed within the "Clear Zone ," as defined by AASHTO Roadside Design Guide , with the following characteristics: Comply with National Cooperative Highway Research Program (NCHRP) Report 350, Meet Test Level 3 (TL -3) requirements, and Have an FHWA letter of acceptance. The Resident Engineer may approve the use of other terminals in locations where impacts are unlikely, or if properly shielded by impact attenuators. Provide end terminals fabricated from materials in accordance with ASTM A 36 and galvanized after fabrication in accordance with ASTM A 123. Ensure welding required by the Contract is performed by a certified welder in accordance with AWS D1.1.
E.Posts Provide socketed posts with caps, placed in metal or plastic sleeves installed in a concrete foundation. Provide posts fabricated from materials meeting or exceeding ASTM A 36 and galvanized after fabrication in accordance with ASTM A 123. Ensure welding required by the Contract is performed by a certified welder in accordance with A WS D1.1. Provide domestically produced posts cold -formed from hot -rolled milled steel of the dimensions shown on the Plans. Prevent debris from entering the socket by providing a fitting gasket to tightly seal each post. Provide and place reinforcing ste el in concrete foundations as shown on the Plans. HIGH -TENSION CABLE BARRIER 628.04 599 F. Delineating High Tension Cable Barrier Provide high tension cable barrier installations delineated with retroreflective sheeting. Provide Type VIII retroreflective sheeting in accordance with ASTM D 4956. Provide yellow or white sheeting the same color as the adjacent edge line. Apply the sheeting to the last five posts at each end of the installation and, for the remainder of the installation, at least every 50 ft [15 m]. Attach the sheeting near the top of the post in accordance with the manufacturer's recommendations. Ensure at least 7 in² [4,500 mm²] of sheeting is visible when viewed on a line parallel to the roadway centerline. For median installations, apply the sheeting to both sides of the po st. For roadside installations, apply the sheeting only to the side facing traffic.
628.03 Equipment — Vacant
628.04 Construction Methods
A.General Provide crashworthy impact attenuators or end treatments for high -tension cable barrier systems at the loc ations shown on the Plans or as directed by the Resident Engineer. Ensure the high -tension cable barrier systems and end treatments satisfy the NCHRP Report 350 for test level 3 (TL -3) or test level 4 (TL -4) and are approved for use on the National Highwa y System and that the product appears on the Traffic Engineering Division’s Qualified Product List (QPL). Ensure the manufacturer provides an FHWA letter of acceptance before approval by the Resident Engineer and installation. Use a high -tension cable ba rrier system of four wire ropes with a maximum post spacing of 10.5 ft [3.2 m], center to center. Locate and align the cable barrier system as shown on the Plans or as directed by the Resident Engineer. Ensure proper wire rope height as required by the Co ntract. Ensure the surface between the cable barrier system and the edge of the traveled way is smooth, without edge drop -offs, holes, depressions, or slope changes. Space posts as shown on the Plans. Set posts plumb and in line. Place and tension the ca ble barrier system in accordance with the manufacturer’s recommendations immediately after initial installation. Recheck the tension two to three weeks after the initial tensioning and adjust if necessary. Complete a tension log form, signed by the perso n performing the tension reading, which includes the following: Time, Date, Location, Ambient temperature, Final tension reading, and The manufacturer’s recommended tension chart. Submit the log to the Resident Engineer upon completion of the high -tension cable barrier work.
628.06 High -Tension Cable Barrier
600 B. Foundations Construct concrete foundations in accordance with Section 509, “Structural Concrete,” and the manufacturer recommendation. Ensure the top of the footing conforms to the slope of the surround surface. Construct concrete foundations in -place as shown on the Plans and to the grade directed by the Resident Engineer. If an obstruction prevents construction of the foundation at the location shown on the Plans, the Resident Engineer will direct a new location. Place end terminal foundations in excavations of natural, undisturbed ground to the size and shape required by the wire rope safety cable manufacturer, based on soil type and ground conditions. If over -excavation is unavoidable, ensure the side s of the excavation are vertical, and use additional concrete to fill completely the excavated area. Anchor each of the fours cables independently to a concrete end anchor. Alternatively, form and cast the foundations, then backfill using mechanical vibra tion to achieve at least 95 percent (95%) compacted density. Excavate the foundations to the depth determined by the manufacturer’s design engineer, but to no less than 12 in [300 mm] in diameter and 36 in [900 mm] in depth. Ensure excavated materials do not fall back into the hole.
C.Placement Install the cable barrier system on a slope no steeper than 6H:1V. Install the cable barrier system at least 8 ft [2.4 m] from the traveled way or hazardous objects. For slopes located within a median ditch, do no t place the cable barrier from 1 ft [0.3] of the toe of slope to 8 ft [2.4 m] up the slope.
628.05 Method of Measuremen T
For concrete -socketed foundations and anchors, the Resident Engineer will measure the volume of concrete in accordance with Subsection 509.05, “Method of Measurement.”
628.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.HIGH -TENSION CABLE BARRIER (TL-3) Linear Foot [Meter]
B.HIGH -TENSION CABLE BARRIER (TL -4) Linear Foot [Meter]
C.END ANCHORS Each
D.GUARDRAIL TRANSITION Each Include the cost of the excavation, backfilling, reinforcing steel and other incidentals to be included in the contract unit price for End Anchors . MAILBOXES 629.02 601 Include the cost of the following to be included in the contract unit price for High -Tension Cable Barrier (TL-3) or High -Tension Cable Barrier (TL -4): Anchor bolts, Nuts, Washers, Ground rod, Socket or sleeve, Excavation, Backfilling, Caps, and Other incidental work necessary to construct the cable barrier system. The Department will pay for Class AA concrete used in the construction of concrete anchor units and foundations in accordance with Section 509, “Structural Concrete.” SECTION 629 MAILBOXES
629.01 Description
This work consists of placing mailboxes on public rights -of-way within the roadway "Clear Zone ," as defined by the AASHTO Roadside Design Guide , to ensure public safety and safe access for mail delivery and retrieval. Refer to the Plans for a summary of the various sizes, types, quantities, and locations of mailboxes.
629.02 Materials
A.Mailboxes Provide mailboxes made of light metal or formed thermoplastic in accordance with United States Postal Service (USPS) requirements. Provide mailboxes with dimensions, nomenclature, and marking in accordance with AASHTO, “A Guide for Erecting Mailboxes on Highways,” Appendix C. Property owners are responsible for providing newspaper tubes of the appropriate material and dimensions, and placing names on mailboxes.
B.Post Systems
1.Wood Post Provide a support post system consisting of a 4 in × 4 in [100 mm × 100 mm] nominal wood post capable of withstanding the elements and soil -borne attacks (treated or untreated.) The Resident Engineer will allow th e post to be smooth and square, or rough sawn. Ensure that surface splintering is not hazardous. The Department will allow a natural, oiled, or painted surface finish.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 611–614 of 935.