720VEHICULAR IMPACT ATTENUATOR ASSEMBLY

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718.05Submittal of Designs and Details

Working drawings, including foundation details for sign structures when required, shall be submitted in accordance with Subarticle 105.02(c) “Working Drawings”. The details shall include fabrication requirements such as the welding requirements for sign frames and tensioning and detensioning procedures for prestressed concrete poles. The design computations shall address all members, connections (welds, bolts, etc.), anchor bolts, and foundations. The designer shall note on the design computations where the design of each member meets the design requirements and deflection tolerances. Design computations shall include all formulas used and a copy of all calculations for each structure that cover all members, connections (welds, etc.), footings and details necessary for a complete structure design. Where computer generated designs are used, the information shall include the applied loadings, structure geometry, effective wind area and location of attachments (sign panels, signals and light fixtures), component sizes, moments, shears, reactions, component forces, component stresses, allowable component stresses, combined stress ratios, and deflections for each group loading specified in the AASHTO Sign Specifications. VEHICULAR IMPACT ATTENUATOR ASSEMBLY

720.01Description

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.

720.02Materials

Materials furnished for use in the manufacture of the assemblies 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.

720.03Construction 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 begins, it shall be prosecuted diligently and continuously until the assembly is completely installed.

720.04Method 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.

720.05Basis of Payment

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.

720-A Vehicular Impact Attenuator Assembly ( * ) - per each * Description and Model of Attenuator Assembly PORTABLE CONCRETE SAFETY BARRIERS AND IMPACT ATTENUATORS 622

PORTABLE CONCRETE SAFETY BARRIERS AND IMPACT ATTENUATORS

726.01Description

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.

726.02Materials

All materials furnished for use shall conform to the appropriate requirements of Division 800, Materials, the details shown on the plans and the following:

the requirements given in Section 831.

A concrete given in Section 501.

726.03Construction Requirements

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 directed. 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 Portable Impact Attenuators shall 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 writing immediately after every inspection. Damaged attenuators shall immediately be repaired or replaced in accordance with the manufacturer's recommendations.

The Contractor shall be responsible for the 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.

726.04Method of Measurement

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.