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40-27 BUILDING <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />PRECAST CONCRETE I <br />B. Proceed with installation only after unsatisfactory conditions have been corrected. <br />C. Do not install precast concrete units until supporting cast -in -place building structural <br />framing has attained minimum allowable design compressive strength or supporting <br />steel or other structure is complete. <br />3.2 INSTALLATION <br />A. Install clips, hangers, bearing pads, and other accessories required for connecting <br />architectural precast concrete units to supporting members and backup materials. <br />B. Erect precast concrete level, plumb, and square within specified allowable tolerances. <br />Provide temporary supports and bracing as required to maintain position, stability, and <br />alignment as units are being permanently connected. <br />1. Install temporary plastic spacing shims or bearing pads as precast concrete units <br />are being erected. <br />2. Maintain horizontal and vertical joint alignment and uniform joint width as erection <br />progresses. <br />3. Remove projecting lifting devices and grout fill voids within recessed lifting <br />devices flush with surface of adjacent precast surfaces when recess is exposed. <br />4. Unless otherwise indicated, maintain uniform joint widths of 3/4 inch. <br />C. Connect precast concrete units in position by bolting, welding, grouting, or as otherwise <br />indicated on Shop Drawings. Remove temporary shims, wedges, and spacers as soon <br />as practical after connecting and grouting are completed. <br />D. Welding: Comply with applicable AWS D1.1/D1.1 M and AWS D1.4 for welding, <br />welding electrodes, appearance, quality of welds, and methods used in correcting <br />welding work. <br />1. Protect precast concrete units and bearing pads from damage by field welding or <br />cutting operations, and provide noncombustible shields as required. <br />2. Welds not specified shall be continuous fillet welds, using no less than the <br />minimum fillet as specified by AWS. <br />3. Clean weld -affected metal surfaces with chipping hammer followed by brushing, <br />and reprime damaged painted surfaces. <br />4. Remove, reweld, or repair incomplete and defective welds. <br />E. At bolted connections, use lock washers, tack welding, or other approved means to <br />prevent loosening of nuts after final adjustment. <br />C06922.001.00 <br />Where slotted connections are used, verify bolt position and tightness. For <br />sliding connections, properly secure bolt but allow bolt to move within connection <br />slot. For friction connections, apply specified bolt torque and check 25 percent of <br />bolts at random by calibrated torque wrench. <br />03 45 00 - 10 ' <br />05-22-14 <br />