Laserfiche WebLink
A. 150 mm, <br /> B. The spacing of the cross wires plus 50 mm,or <br /> C. The numerical value of the longitudinal wire size (MW-Size Number) times 370 divided by the spacing of the <br /> longitudinal wires in millimeters. <br /> 52-1.08B Service Splicing and Ultimate Butt Splicing Requirements <br /> • Service splices and ultimate butt splices shall be either butt welded or mechanical splices, shall be used at the <br /> locations shown on the plans,and shall conform to the requirements of these specifications and the special provisions. <br /> 52-1.08B(1) Mechanical Splices <br /> • Mechanical splices to be used in the work shall be on the Department's current prequalified list before use. The <br /> prequalified list can be obtained from the Department's internet site listed in the special provisions or by contacting the <br /> Transportation Laboratory directly. <br /> • When tested in conformance with the requirements in California Test 670,the total slip shall not exceed the values <br /> listed in the following table: <br /> Reinforcing Bar Number Total Slip m <br /> 13 250 <br /> 16 250 <br /> 19 250 <br /> 22 350 <br /> 25 350 <br /> 29 350 <br /> 32 450 <br /> 36 450 <br /> 43 600 <br /> 57 750 <br /> • Slip requirements shall not apply to mechanical lap splices, splices that are welded, or splices that are used on <br /> hoops. <br /> • Splicing procedures shall be in conformance with the manufacturer's recommendations, except as modified in this <br /> section. Splices shall be made using the manufacturer's standard equipment,jigs,clamps,and other required accessories. <br /> • Splice devices shall have a clear coverage of not less than 40 mm measured from the surface of the concrete to the <br /> outside of the splice device. Stirrups, ries, and other reinforcement shall be adjusted or relocated, and additional <br /> reinforcement shall be placed,if necessary,to provide the specified clear coverage to reinforcement. <br /> • The Contractor shall furnish the following information for each shipment of splice material in conformance with the <br /> provisions in Section 6-1.07,"Certificates of Compliance:" <br /> A. The type or series identification of the splice material including tracking information for traceability. <br /> B. The bar grade and size number to be spliced. <br /> C. A copy of the manufacturer's product literature giving complete data on the splice material and installation <br /> procedures. <br /> D. A statement that the splicing systems and materials used in conformance with the manufacturer's installation <br /> procedures will develop the required tensile strengths,based on the nominal bar area, and will conform to the total <br /> slip requirements and the other requirements in these specifications. <br /> E. A statement that the splice material conforms to the type of mechanical splice in the Department's current <br /> prequalified list. <br /> 52-1.08B(2) Butt Welded Splices <br /> • Except for resistance butt welds, butt welded splices of reinforcing bars shall be complete joint penetration butt <br /> welds conforming to the requirements in AWS D 1.4,and these specifications. <br /> • Welders and welding procedures shall be qualified in conformance with the requirements in AWS D 1.4. <br /> • Only the joint details and dimensions as shown in Figure 3.2, "Direct Butt Joints," of AWS D 1.4, shall be used for <br /> making complete joint penetration butt welds of bar reinforcement. Split pipe backing shall not be used. <br /> • Butt welds shall be made with multiple weld passes using a stringer bead without an appreciable weaving motion. <br /> The maximum stringer bead width shall be 2.5 times the diameter of the electrode and slagging shall be performed between <br /> each weld pass. Weld reinforcement shall not exceed 4 mm in convexity. <br /> Contract No. 10-OM7104 <br /> 36 <br />