High Tension Cable Median Barrier Art. 644.06 SECTION 644. HIGH TENSION CABLE MEDIAN BARRIER
644.01 Description. This work shall consist of furnishing and installing a high
tension cable (HTC) median barrier with terminals/end anchorages.
644.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Reinforcement Bars ....................................................................... 1006.10(a)
b.Portland Cement Concrete (Note 1) ....................................................... 1020
c.Wire Rope (Cable) and Fittings (Note 2) Note 1. The portland cement concrete shall be Class SI. Note 2. The wire rope (cable) shall be according to AASHTO M 30, Type 1 with Class A coating, of the diameter shown in the manufacturer’s specifications. Additionally, the wire rope shall be prestretched and shall have a breaking strength of 39,285 lbs (175 kN) for 3/4 in. (19 mm) wire rope (individual wire strength equivalent to 174,000 psi (1200 N/sq mm)) and the prestretched wire rope shall have a minimum modulus of elasticity of 11,805,000 psi (8300 kg/sq mm).
644.03 Equipment. Equipment shall be according to the median barrier
manufacturer’s specifications and the following. Item Article/Section
a.High Tension Cable Median Barrier ............................................... 1106.02(n) CONSTRUCTION REQUIREMENTS
644.04 General. The HTC median barrier shall be constructed to the lines
and grades shown on the plans and according to the manufacturer’s specifications, except as modified by the contract documents.
644.05 Line Post Foundations. Line posts for the HTC median barrier shall
be placed in concrete socket foundations. The minimum depth of the foundations shall be as shown on the plans. The minimum diameter for the foundations shall be 12 in. (300 mm) and the tops of the foundations shall be crowned 1/2 in. (13 mm). When the barrier is to be placed within paved shoulders or mow strips, the paved area(s) shall be constructed first and the concrete foundations placed in cored or formed holes.
644.06 End Anchorages. The Contractor shall submit to the Engineer shop
drawings detailing the required end anchorage foundation system at each location. The system shall utilize drilled shaft foundations and the number, diameter, depth, reinforcement, and cable connection of each shall be determined by the supplier. As a minimum, single shaft anchorage systems, with all cables terminating at one shaft, shall be at least 24 in. (600 mm) in diameter and 12 1/2 ft (3.8 m) deep while multiple shaft systems, with one cable per shaft, shall be at least 18 in. (450 mm) in diameter Art. 644.07 High Tension Cable Median Barrier and 6 1/2 ft (2 m) deep. The foundation soils shall be inspected during installation to verify that either medium dense granular material or medium stiff clay soils are present. The minimum longitudinal reinforcement shall be eight – No. 8 (No. 25) bars for the single shaft system, and six – No. 6 (No. 19) bars for the multiple shaft system. The minimum confinement reinforcement shall be No. 4 (No. 13) hoops at 6 in. (150 mm) centers or a No. 4 (No. 13) spiral with a 6 in. (150 mm) pitch. The minimum concrete cover over the reinforcement shall be 3 in. (75 mm).
644.07 Tensioning. Prior to acceptance of the work, the tension of the HTC
median barrier shall be checked, and adjusted as necessary, according to the manufacturer’s temperature/tension chart or relationship.
644.08 Hands-On Demonstration. When included in the contract, a hands-
on demonstration(s) of maintenance/repair procedures, recommendations and discussion of vehicle recovery, and provisions for emergency openings in the barrier shall be conducted. These demonstrations shall be for emergency responders, maintenance personnel, and others invited by the Engineer and shall be conducted either at the job-site or at another agreed to meeting facility. Up to 30 attendees shall be accommodated at each demonstration.
644.09 Method of Measurement. HTC median barrier will be measured for
payment in feet (meters) along the top cable between terminals. Terminals shall be defined as the end anchorages and other components from the extreme ends of a run to a point 50 ft (15.2 m) into the run. This definition of the terminal applies regardless of the length of need point, transitions from anchorage to full height cable, or other features that may vary between systems.
644.10 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for HIGH TENSION CABLE MEDIAN BARRIER. The terminals/end anchorages and demonstrations will be paid for at the contract per each for HIGH TENSION CABLE MEDIAN BARRIER TERMINALS and HIGH TENSION CABLE MEDIAN BARRIER DEMONSTRATION respectively. OTHER ITEMS SECTION 660. RESERVED SECTION 661. HOT-MIX ASPHALT SHOULDER CURB
661.01 Description. This work shall consist of the construction of hot-mix
asphalt (HMA) curb along the outer edge of HMA shoulders.
661.02 Materials. Materials shall be according to Article 406.02. The mixture
composition shall be IL-9.5, IL-9.5FG, or IL-9.5L. CONSTRUCTION REQUIREMENTS Concrete Shoulder Curb Art. 662.04
661.03 General. The temperature of the base on which the curb is placed
shall not be less than 40 °F (4 °C) at the time the curb is placed. Prior to placing the curb, the base shall be cleaned and then primed with bituminous material at a rate of 0.05 to 0.1 gal/sq yd (0.2 to 0.5 L/sq m). The HMA shoulder curb shall be constructed with a mechanical curb laying machine of a type approved by the Engineer. Prior to constructing the curb, additional shoulder shall be constructed according to the details shown on the plans. All exposed curb surfaces shall be sealed with a liberal application of any emulsified asphalt, asphalt binder, rapid curing liquid asphalt, or medium curing liquid asphalt listed in Section 1032. The material shall be applied uniformly by spraying or brushing at a rate satisfactory to the Engineer.
661.04 Method of Measurement. This work will be measured for payment in
feet (meters) along the face of the curb in place. No deduction in length will be made for any drainage structures installed in the curbing. The additional shoulder under the curb will not be measured for payment.
661.05 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for HOT-MIX ASPHALT SHOULDER CURB. SECTION 662. CONCRETE SHOULDER CURB
662.01 Description. This work shall consist of the construction of concrete
curb along the outer edge of portland cement concrete shoulders.
662.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
b.Protective Coat ....................................................................................... 1023
c.Poured Joint Sealers .............................................................................. 1050 CONSTRUCTION REQUIREMENTS
662.03 General. Concrete shoulder curb shall be constructed according to
the details shown on the plans and the applicable portions of Section 483. The concrete shoulder curb shall be constructed integrally with the portland cement concrete shoulder. Joints in the shoulder shall be continued through the curb and shall be sealed according to Article 420.12. Protective coat shall be applied according to Article 420.18.
662.04 Method of Measurement. This work will be measured for payment in
feet (meters) in place along the face of the curb. No deduction in length will be made, for any drainage structures installed in the curb. Protective coat, if required, will not be measured for payment.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 590–592 of 1,217. View official source ↗