720.05 Basis of Payment.
Threaded adjusting nuts shall be used to establish the "rake" in accordance with the requirements for the installation of leveling nuts on anchor bolts. The use of shims or other leveling devices will not be permitted. Hardware and fittings shall be installed as shown on the contract plans and approved shop drawings. Messenger cable supporting traffic signal heads shall not be sagged to a vertical distance greater than fi ve percent of the length of the span between strain poles. Messenger cable supporting signal control cable only shall be sagged to a vertical distance not greater than two percent of the length of the span between strain poles. Tether cables shall not be s agged to a vertical distance greater than five percent of the length of the span between strain poles.
g.Luminaire and Traffic Surveillance Poles Extreme care shall be taken during installation of the luminaire assembly and surveillance devices to ensure that no damage occurs to these devices. Double nuts and washers shall be used to plumb the pole about its center axis if a twin bracket is used. When a single arm type is used, the back side of the pole shall be plumbed after the luminaire and sur veillance devices and hardware have been installed, thus providing a slight rake from the traveled way. VEHICULAR IMPACT ATTENUATOR ASSEMBLY
720.01 Description.
This Section shall cover the work of furnishing and installing vehicular impact attenuator assemblies of the design shown in the detailed plans at the locations designated by the plans, the proposals or directed.
720.02 Materials.
Materials furnished for use in the manufacture of the assembli es shall comply with the requirements noted in the detailed plans. Materials used in the actual installation of the attenuation in the work shall comply with appropriate provisions of these specifications.
720.03 Construction Requirements.
Any installation which is to be performed under traffic shall be provided with adequate warning and protective devices until such time as the assembly becomes usable. Once work is begun, it shall be prosecuted diligently and continuously until the assembly is completely i nstalled.
720.04 Method of Measurement.
Vehicular impact attenuators of the design designated by the plans or proposal will be measured in assembly installations, complete in place at the designated locations.
720.05 Basis of Payment.
a.Unit Price Covera ge. The accepted impact attenuator assemblies, measured as noted above, will be paid for at the contract price bid for each assembly. Said unit price bid shall be full compensation for the furnishing of all materials and the installation of the designated assembly on its foundation, in its designated location, and includes furnishing of all equipment, tools, labor and other incidentals necessary to complete the work and provide an operational assembly complete in place.
b.Payment will be made under Item N o.: 720-A Vehicular Impact Attenuator Assembly ( * ) - per each * Description and Model of Attenuator Assembly
726.01 Description.
SECTION 726 PORTABLE CONCRETE SAFETY BARRIERS AND IMPACT ATTENUATORS
726.01 Description.
This Section shall cover the work of furnishing and installing a portable concrete safety barrier and impact attenuators at the locations shown on the plans, designated in the proposal or directed, along with the satisfactory removal thereof, if so directed. This Section shall also cover the work of picking up State furnished portable concrete barrier units at a designated State storage yard, their installation at the designated location shown on the plans, and the returning of the units to the State storage yard. Portable Safety Barriers shall be classified as to "Type" which will designate the size, shape, height, etc., all in accordance with details shown in the plans. Unless specified otherwise, the type shall be optional, but once a type is selected it shall be used throughout the contract, unless otherwise approved by the Engineer. Portable Impact Attenuators shall be in accordance with details shown in the plans.
726.02 Materials.
All materials furnished for use shall conform to the appropriate requirements of Division 800, Materials, the details shown on the plans and the following: Concrete Safety Barriers shall be manufactured by an approved producer in accordance with the requirements given in Section 831. Concrete, unles s otherwise provided by plan details, shall meet the requirements for Class A concrete given in Section 501. Steel Reinforcement shall meet the requirements of Section 502.
726.03 Construction Requirements.
a.General . The Construction of barrier units shall be in accordance with the appropriate provisions of Section 501, unless otherwise noted on the plans or directed. The finished concrete shall be within reasonably close conformity to the lines, grades and dimensions shown on the plans or direct ed. The barrier unit shall present a smooth uniform appearance free of objectionable cavities or projections. Where a 10 foot {3 m} straightedge is placed horizontally on the exposed faces of the unit, the surface shall not vary more than 0.02 feet {6 mm} from the edge of the straightedge. The exposed concrete surfaces shall be finished in accordance with the requirements given in Section 501 for a Class 2 finish on exposed surfaces, unless otherwise specified by plan details. Portable Impact Attenuators sh all be constructed in accordance with plan details. The Contractor shall inspect the attenuators for damage periodically (at least weekly), and immediately after a known impact. The Contractor shall notify the Engineer of the results of the inspection in w riting immediately after every inspection. Damaged attenuators shall immediately be repaired or replaced in accordance with the manufacturer's recommendations.
b.Handling, Storage, Transporting and Installation. The Contractor shall be responsible for th e proper handling, transporting and installation of the barrier units and impact attenuators, complete in place, at the designated locations. Unless otherwise approved by the Engineer, the units shall be lifted and supported at the points shown on the plans or directed. Damage to any unit caused by improper handling, transporting or installation on the part of the Contractor shall be cause for the Engineer to order it to be repaired or replaced at no additional cost to the State.
726.04 Method of Measuremen t.
The Portable Concrete Safety Barriers of the type designated will be measured in linear feet {meters} to the nearest 0.1 feet {0.1 m} along the top surface of the barrier. The Portable Impact Attenuators will be measured per each in accordance with the plan details for one complete attenuator and its accessories. State Furnished Portable Impact Attenuators will be measured per each.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 622–622 of 934.