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STRUCTURAL STEEL Section 05100 15-1207 1. Inspect mating surfaces to insure that bolt head and nut will have full bearing and that metal plies will mate flush between bolts. Install and tighten to a snug condition (ST) such that laminated surfaces bear fully on one another, using an impact wrench or "full effort" of an installer using a standard spud wrench. 2. Install bolts in matching holes; Do not distort metal or enlarge holes by drifting during assembly. Remake mismatched components to achieve tolerances indicated. 3. Holes mismatched in excess of 1/8 inch will be rejected. 4. Ream holes mismatched in excess of 3/32 inch to the next larger size bolt. 5. Do not enlarge holes by flame cutting or air/arc ("plasma") cutting. 6. Provide flat washer(s) at over -size holes. 7. Provide ASTM F-436 beveled washers when the slope of the surfaces of parts in contact with the bolt head or nut is greater than 1:20. 8. Do not install bolts with damaged threads. F. High strength bolts: General: Install per referenced standard for bearing type (A325N) high strength bolting unless otherwise indicated on drawings and snug tighten per RCSC Section 8.1. Provide slip critical (A325 SC) connections where indicated on drawings and pretension per RCSC Section 8.2. G. Field Welding: 1. General: Weld per AWS procedure; use qualified welders. Preheat per AWS where required. All welding shall be under supervision of testing laboratory. 2. Welding: Weld in a manner to prevent warping or distortion of finished product. Use jigs which will not restrain piece from moving during welding and cooling after welding. Sequence weld passes at a joint to prevent excessive heat build-up or cause shrinkage cracks to form. Adequately peen and brush joint after successive passes to prevent slag inclusions, open pockets, and inadequate fusion. 3. Auxiliary Member Connections and Temporary Welds: Per AWS except that preheating may be omitted on ASTM A36 steel for single pass fillets welds with low hydrogen electrodes under following conditions; Air temperature is 60 degrees F or over, steel is dry, and welds to structure base material are more than 1" away from corners or ends of plates. H. Touch-up: After erection is complete, touch-up all shop priming coats damaged during transportation and erection, and prime all field welds, using the prime paint specified for shop priming. I. Ceiling Grid System: Grid system shall be fabricated and installed as shown, including attachments to walls and overhead structure. Any connections not shown on drawings shall be made with standard MFMA fittings and 1/2" diameter bolts. Supports, Shoring and Bracing: Allow for erection loads and provide sufficient temporary bracing to maintain structure in safe condition, plumb, and in true alignment until completion of erection and installation of permanent bracing. Conform to requirements of all applicable laws and governing safety regulations. Resist imposed loads, including those of stored materials and equipment. 12