Impact Attenuators, Temporary Art. 706.05 SECTION 706. IMPACT ATTENUATORS, TEMPORARY
706.01 Description . This work shall consist of furnishing, installing,
maintaining, and removing temporary impact attenuators of the category and test level specified.
706.02 Materials . Materials shall be according to the impact attenuator
manufacturer’s specifications and the following: Item Article/Section
a.Fine Aggregate (Note 1) ..................................................................... 1003.01
b.Steel Posts, Structural Shapes, and Plates ........................................ 1006.04
c.Rail Elements, End Section Plates, and Splice Plates ........................ 1006.25
d.Bolts, Nuts, Washers and Hardware ................................................... 1006.25
e.Hollow Structural Tubing ................................................................. 1006.27(b)
f.Wood Posts and Wood Blockouts......................... 1007.01, 1007.02, 1007.06
g.Preservative Treatment ...................................................................... 1007.12
h.Packaged, Dry, Rapid Hardening Mortar or Concrete ............................. 1018 Note 1. Fine aggregate shall be FA 1 or FA 2, Class A quality. The sand shall be unbagged and shall have a maximum moisture content of five percent. CONSTRUCTION REQUIREMENTS
706.03 General . Impact attenuators shall meet the testing criteria contained
in either the National Cooperative Highway Research Program (NCHRP) Report 350 or MASH and shall be on the Department’s qualified product list.
706.04 Installation . Impact attenuators shall be installed according to the
manufacturer’s specifications and include all necessary transitions between the impact attenuator and the item to which it is attached. Regrading of slopes or approaches for the installation shall be as shown on the plans. Attenuator bases, when required by the manufacturer, shall be constructed on a prepared subgrade according to the manufacturer’s specifications. The surface of the base shall be slightly sloped or crowned to facilitate drainage. When water filled attenuators are used between November 1 and April 15, they shall contain anti-freeze according to the manufacturer’s recommendations.
706.05 Markings . Sand module impact attenuators shall be striped with
alternating reflectorized Type AA or Type AP fluorescent orange and reflectorized white horizontal, circumferential stripes. There shall be at least two of each stripe on each module. Other types of impact attenuators shall have a terminal marker applied to their nose and reflectors along their sides. Art. 706.06 Movable Traffic Barrier
706.06 Maintenance . All maintenance of the impact attenuators shall be the
responsibility of the Contractor until removal is directed by the Engineer.
706.07 Relocate . When relocation of temporary impact attenuators is
specified, they shall be removed, relocated and reinstalled at the new location. The reinstallation requirements shall be the same as those for a new installation.
706.08 Removal . Surplus material shall be disposed of according to
Article 202 — 03. Anti-freeze, when present, shall be disposed of/recycled according to
local ordinances. When impact attenuators have been anchored to the pavement, the anchor holes shall be repaired with rapid set mortar; only enough water to permit placement and consolidation by rodding shall be used and the material shall be struck-off flush.
706.09 Method of Measurement . This work will be measured for payment as
each, where each is defined as one complete installation.
706.10 Basis of Payment . This work will be paid for at the contract unit price
per each for IMPACT ATTENUATORS, TEMPORARY (FULLY REDIRECTIVE, NARROW); IMPACT ATTENUATORS, TEMPORARY (FULLY REDIRECTIVE, WIDE); IMPACT ATTENUATORS, TEMPORARY (FULLY REDIRECTIVE, RESETTABLE); IMPACT ATTENUATORS, TEMPORARY (SEVERE USE, NARROW); IMPACT ATTENUATORS, TEMPORARY (SEVERE USE, WIDE); IMPACT ATTENUATORS, TEMPORARY (NON-REDIRECTIVE); or IMPACT ATTENUATORS, TEMPORARY (NON-REDIRECTIVE, NARROW); of the test level specified. Relocation of the devices will be paid for at the contract unit price per each for IMPACT ATTENUATORS, RELOCATE (FULLY REDIRECTIVE); IMPACT ATTENUATORS, RELOCATE (SEVERE USE); or IMPACT ATTENUATORS, RELOCATE (NON-REDIRECTIVE); of the test level specified. Regrading of slopes or approaches will be paid for according to Section 202 and/or Section 204 of the Standard Specifications. SECTION 707. MOVABLE TRAFFIC BARRIER
707.01 Description . This work shall consist of furnishing, installing,
maintaining, relocating, and removing a movable traffic barrier at locations shown on the plans.
707.02 Equipment . Equipment shall be according to the following.
Item Article/Section
a.Movable Traffic Barrier .................................................................... 1106.02(l) CONSTRUCTION REQUIREMENTS Temporary Water Filled Barrier Art. 708.03
707.03 General . The movable traffic barrier shall be assembled and installed
according to the manufacturer’s specifications. The approach end of the movable traffic barrier shall be protected with an impact attenuator which is capable of being moved with the movable barrier system. When not in use, the device shall be stored longitudinally along the far edge of the shoulder or adjacent to concrete median barrier. The approach end shall be protected with the impact attenuator. The barrier shall include nighttime delineation consisting of either barrier wall markers or corrugated retroreflective panels. The panels shall consist of one 6 x 36 in. (150 x 900 mm) panel per barrier unit and shall be yellow when on center line or left lane line and white when on edge line.
707.04 Method of Measurement . Movable traffic barrier will be measured for
payment in feet (meters) in place, along the centerline of the movable barrier.
707.05 Basis of Payment. Movable Traffic Barrier will be paid for at the
contract unit price per foot (meter) for MOVABLE TRAFFIC BARRIER. Movement of the barrier will not be paid for separately, but shall be included in the contract unit price for movable traffic barrier. Temporary impact attenuators will be paid for separately. SECTION 708. TEMPORARY WATER FILLED BARRIER
708.01 Description . This work shall consist of furnishing, installing,
maintaining, relocating, and removing a temporary water filled barrier at locations shown on the plans.
708.02 Equipment . Equipment shall be according to the following.
Item Article/Section
a.Temporary Water Filled Barrier....................................................... 1106.02(k) CONSTRUCTION REQUIREMENTS
708.03 General . The temporary water filled barrier shall be assembled,
installed, and maintained according to the manufacturer’s specifications and be capable of withstanding below freezing temperatures. The barrier shall be installed with orange and white alternating units. When not in use, the device shall be stored longitudinally along the far edge of the shoulder or adjacent to concrete median barrier. The approach end of the barrier shall be protected with an impact attenuator unless the barrier can serve as its own crashworthy end treatment, as indicated on the Department’s qualified product list.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 646–648 of 1,217. View official source ↗