SPECIFICATIONS. 145 



1123. Rivet Holes. When general reaming is not required the diameter of the punch shall 

 In- IMMIV t li.m fa in. greater than the diameter of the rivet; nor the diameter of the die more than 

 $ in. griMtrr t han the diameter of the punch. Material more than J in. thick shall be sub-punched 

 and reamed or drilled from the solid. 



124. Punching. All punching shall be accurately done. Drifting to enlarge unfair holes 

 will not be allowed. If the holes must be enlarged to admit the rivet, they shall be reamed. 



r matching of holes will be cause for rejection. 



125. Sub-punching and Reaming. Where reaming is required, the punch used shall have a 

 ianu'ter not less than A m - smaller than the nominal diameter of the rivet. Holes shall then be 



reamed to a diameter not more than ^ in. larger than the nominal diameter of the rivet. All 

 reaming shall be done with twist drills. (140.) 



126. Reaming After Assembling. When general reaming is required it shall be done after 

 the pieces forming one built member are assembled and firmly bolted together. If necessary to 

 take the pieces apart for shipping and handling, the respective pieces reamed together shall be 



marked that they may be reassembled in the same position in the final setting up. No inter- 

 nge of reamed parts will be allowed. 



127. Edge Planing. Sheared edges or ends shall, when required, be planed at least i in. 



128. Burrs. The outside burrs on reamed holes shall be removed. 



129. Assembling. Riveted members shall have all parts well pinned up and firmly drawn 

 ither with bolts, before riveting is commenced. Contact surfaces to be painted. 



130. Lattice Bars. Lattice bars shall have neatly rounded ends, unless otherwise cabled for. 



131. Web Stiff eners. Stiffeners shall fit neatly between flanges of girders. Where tight 

 fits are called for, the ends of the stiffeners shall be faced and shall be brought to a true contact 

 bearing with the flange angles. 



132. Splice Plates and Fillers. Web splice plates and fillers under stiffeners shall be cut to 

 fit within J in. of flange angles. 



133. Web Plates. Web plates of girders, which have no cover plates, shall be flush with 

 the backs of angles or project above the same not more than J in., unless otherwise called for. 

 When web plates are spliced, not more than J in. clearance between ends of plates will be allowed. 



134. Connection Angles. Connection angles for floorbeams and stringers shall be flush 

 with each other and correct as to position and length of girder. In case milling (of all such angles) 

 is needed or is required after riveting, the removal of more than ^ in. from their thickness will be 

 cause for rejection. 



135. Rivets. Rivets shall be driven by pressure tools wherever possible. Pneumatic 

 hammers shall be used in preference to hand driving. 



136. Riveting. Rivets shall look neat and finished, with heads of approved shape, full and 

 of equal size. They shall be central on shank and grip the assembled pieces firmly. Recupping 

 and calking will not be allowed. Loose, burned or otherwise defective rivets shall be cut out and 

 replaced. In cutting out rivets, great care shall be taken not to injure the adjacent metal. If 

 necessary, they shall be drilled out. 



137. Turned Bolts. Wherever bolts are used in place of rivets which transmit shear, the 

 holes shall be reamed parallel and the bolts turned to a driving fit. A washer not less than i in. 

 thick shall be used under nut. 



138. Members to be Straight. The several pieces forming one built member shall be straight 

 and fit closely together, and finished members shall be free from twists, bends or open joints. 



139. Finish of Joints. Abutting joints shall be cut or dressed true and straight and fitted 

 close together, especially where open to view. In compression joints, depending on contact 

 bearing, the surfaces shall be truly faced, so as to have even bearings after they are riveted up 



plete and when perfectly aligned. 



140. Field Connections. Holes for floorbeam and stringer connections shall be sub-punched 

 id reamed according to paragraph 125, to a steel templet one inch thick. (If required, all 



other field connections, except those for laterals and sway bracing, shall be assembled in the shop 

 and the unfair holes reamed; and when so reamed, the pieces shall be match-marked before being 

 taken apart.) 



141. Eye-bars. Eye-bars shall be straight and true to size, and shall be free from twists, folds 

 in the neck or head, or any other defect. Heads shall be made bv upsetting, rolling or forging. 

 Welding will not be allowed. The form of heads will be determined by the dies in use at the 

 works where the eye-bars are made, if satisfactory to the engineer, but the manufacturer shall 

 guarantee the bars to break in the body when tested to rupture. The thickness of head and 

 neck shall not vary more than ^ in. from that specified. 



142. Boring Eye-bars. Before boring, each eye-bar shall be properly annealed and care- 

 fully straightened. Pin-holes shall be in the center line of bars and in the center of heads. Bars 

 of the same length shall be bored so accurately that, when placed together, pins ^ in. smaller in 

 diameter than the pin-holes can be passed through the holes at both ends of the bars at the same 

 time without forcing. 



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