HIGH -TENSION CABLE BARRIER SECTION 722 397 SECTION 722 — HIGH -TENSION CABLE BARRIER
722.1Description.
This work consists of constructing high -tension cable barrier (HTCB).
722.2Materials.
Level 4 (TL -4) installation.
for a Test Level 3 (TL -3) installation.
requirements for a Test Level 3 (TL -3) installation.
or equal. Two coats of inhibitor from the below -ground end to 6 -inch above the final ground elevation.
requirements for a Test level 3 (TL -3) installation.
or equal. Two coats of inhibitor from the below -ground end to 6 -inch above the final ground elevation.
722.3Construction.
722.3.1 Submittals.
concrete end -terminal anchors. Base the design of line post concrete footings and concrete end - terminal anchors on the specific project location, requiremen ts as shown on the contract, what is specified here, and on Department supplied soil boring information.
722.3.2 Training.
engineer . Provide a minimum of 2 training sessions consisting of installation training before beginning cable barrier construction and maintenance training before primary inspection. The HIGH -TENSION CABLE BARRIER SECTION 722 398 manufacturer shall establish the training duration and shall provide field training on all aspects of the system. Coordinate the training schedule and location with the engineer. The engineer will advise the appropriate department staff, including construction inspectors and maintenance personnel regarding the training location and schedule. Provide all training materials in both hard copy and electronic PDF format.
date to the engineer a minimum of 14 calendar days before the session date for review and approval. At a minimum, the training shall include the following participants:
set of training handouts, the manufacturer’s installation manual, and the manufacturer’s plans for the approved system. Cover all aspects of the system inst allation, including the following subjects:
concrete design strength, curing time, concrete testing, and locations; ii. line post installation; iii. end terminal assembly installation; and iv. wire rope installation and tensioning.
system. Submit the proposed training date to the engineer a minimum of 14 calendar days prior to the training session date for review and approval. Include the f ollowing participants:
set of training handouts, the manufacturer’s maintenance manual, and the manufacturer’s plans for the approved system. The training course and accompanying course material shall cover, at a minimum, the following subjects: HIGH -TENSION CABLE BARRIER SECTION 722 399 a. A description of the system components.
3 Construction
potential conflicts with underground utilities or drainage before construction. The engineer may require the contractor to excavate test pits to determine the exact location and depth of any existing utility that may c onflict with the proposed alignment of the high -tension cable barrier system.
post foundations, terminals, transitions, or anchor systems. Excavate and grade as necessary for the HTCB maintenance strip in accordance with the contrac t. Pave the maintenance strip before excavating and drilling post foundations.
foundations in accordance with the manufacturer’s requirements and approved foundation shop drawings. Place foundation reinforcing steel as required in t he approved shop drawings. Place the concrete and install sockets, keeping the top of the foundation flush with the final grade. Place line posts and fitting gaskets. Space the posts, in accordance with the manufacturer’s requirements. Set posts plumb and in a straight line.
engineer.
Position rigging screws to avoid interference with posts or other rigging screws unless recommended by the manufacturer.
testing equipment specified by the manufacturer at the beginning of the installation and throughout the project. The Department will only accept results from 1 model of tension testing device. Provide a certificate to the engineer showing that the tensioning instrument was calibrated no more than 30 calendar days before its first use on the project.
certifying that the tester is trained in the use of the testing equipment.
21 calendar days after the first test. Re -tension the cable when the test reading is less than the HIGH -TENSION CABLE BARRIER SECTION 722 400 manufacturer’s recommendations for the given temperature. Re -tension the cables to the manufacturer’s specifications by successively reading tension measurements at every rigging screw or turnbuckle. Repeat the testing and re -tension the cable in accordanc e with the manufacturer’s specifications until the manufacturer certifies the full cable system.
certifying that the contractor tensioned the cable in accordance with the manufacturer’s specifications and that the cable tension complies with the manufacturer’s re quirements.
in each direction of a cable barrier segment, delineate posts at intervals no greater than 50 -feet on tangents and curves with a radius of 3,500 -feet or greater and 30 -feet on curves having a radius less than 3,500 -feet. Delineate all end terminal posts in accordance with the manufacturer’s recommendations. Ensure that delineation is visible from both directions of traffic unless otherwise shown on the pl ans. Use delineation consisting of yellow retroreflective sheeting meeting the requirements of ASTM D4956 Type IX material. The minimum area of sheeting required is 8 square inches. Attach the sheeting near the top of the post as recommended by the manufac turer. On posts with flat surfaces facing approaching traffic, the contractor may apply retroreflective sheeting directly to the post. On posts without flat surfaces facing approaching traffic, the contractor may apply the sheeting to the post cap.
construction or prior to final acceptance of the Project. Mark the affected area as directed by the engineer within 8 -hours of the damage. If only line posts incurred damage, replace the posts and re-install the cable to the posts within 48 -hours of contractor notification. If an end terminal is struck and the cables disengaged, repair, re -tension, and test the system within 24 -hours of contractor notification. After each hit, re -tension the system in accordance with the manufacturer’s specifications, if required.
the parts to the DelDOT maintenance facility as directed by the engineer. Provide an extra supply of the following: HIGH -TENSION CABLE BARRIER SECTION 722 401 1. Socketed -type line posts, including post hardware, caps, reflective sheeting, straps, spacers, and socket covers. Include 200 posts and accessories.
assemblies.
socket covers. Provide enough materials to complete 3 end anchor installations.
that bears a serial number and has a current Certificate of Calibration from a National Institute of Standards and Testing accredited laboratory.
722.4Method of Measurement.
The Department will measure the quantity of high -tension cable barrier as the number of linear feet constructed, tested, and accepted. The Department will measure the length from the first line post adjacent to each end terminal for the run of cable barrie r. The Department will not include posts associated with the end terminal, as identified in the manufacturer’s shop drawings, in the linear foot quantity. The Department will measure the quantity of end terminals as the actual number of each end terminal c onstructed, tested and accepted.
722.5Basis of Payment.
linear foot. Price and payment will constitute full compensation for:
and payment will constitute full compensation for:
HIGH -TENSION CABLE BARRIER SECTION 722 402 4. backfill and backfilling;
ITEM DESCRIPTION UNIT 722001 HIGH TENSION CABLE BARRIER LF 722002 HIGH TENSION CABLE BARRIER END TERMINAL EACH CONCRETE BARRIER SECTION 723 403 SECTION 723 — CONCRETE BARRIER
723.1Description.
This work consists of constructing concrete barriers.
723.2Materials.
the engineer’s approval.
723.3Construction.
construction methods in accordance with the contract. Conduct a pre -pour meeting at least 10 - days before the start of work with representatives from the Department, the contractor, and other involved parties.
contract. Remove unsuitable material below the proposed foundation and replace with Borrow Type C as directed by the engineer in accordance with Section 202.
reinforcement bars in accordance with Section 611 and contract. Construct and c ure cast -in-place barrier in accordance with Section 610.3.6.
and casting bed after 12 -hours if the units reach a compressive strength of at least 1,400 PSI. Saw cut joints to control cracking of concrete.