484 ERECTION OF STRUCTURAL STEEL. 



9. Maintenance of Traffic. When traffic is to be maintained it will be carried on in such a 

 manner as to interfere as little as practicable with the work of the Contractor. 



Changes in the supporting structure or tracks required during erection shall be at all times 

 under the direct control and supervision of the Railway Company. 



10. Removal of Old Structure. Unless otherwise specified, metal work in the old structure 

 shall be dismantled without unnecessary damage and loaded on cars or neatly piled at a site 

 immediately adjacent to the tracks, and at a convenient grade for future handling, as may be 

 directed. When the structure is to be used elsewhere all parts will be matchmarked by the 

 Railway Company; when the old bridge is composed of several spans the parts of each shall be kept 

 separate. 



n. Metal Work. Material shall be handled without damage. Threads of all pins shall be 

 protected by pilot and driving nuts while being driven in place. 



Light drifting will be permitted in order to draw the parts together, but drifting for the 

 purpose of matching unfair holes will not be permitted. Unfair holes shall be reamed or drilled. 



Nuts on pins and on bolts remaining in the structure shall be effectively locked by checking 

 the threads. 



All splices and field connections shall be securely bolted prior to riveting. When the parts 

 are required to carry traffic, important connections, such as attachments of stringers and floor- 

 beams, shall have at least fifty (50) per cent of the holes filled with bolts and twenty-five (25) per 

 cent with drift pins. All tension splices shall be riveted up complete before blocking is removed. 

 When not carrying traffic, at least thirty-three and one-third (333) per cent of the holes shall have 

 bolts. 



Rivets in splices of compression members shall not be driven until the members shall have 

 been subjected to full dead load stresses. Rivets shall be driven tight. No recupping or caulking 

 will be permitted. The heads shall be full and uniform in size and free from fins, concentric 

 and in full contact with the metal. Heads shall be painted immediately after acceptance. 



Rivets shall be uniformly and thoroughly heated and no burnt rivets shall be driven. All 

 defective rivets shall be promptly cut out and redriven. In removing rivets the surrounding 

 metal shall not be injured; if necessary, the rivets shall be drilled out. 



12. Misfits. Correction of minor misfits and a reasonable amount of reaming shall be con- 

 sidered as a legitimate part of the erection. 



Any error in shop work which prevents the proper assembling and fitting up of parts by the 

 moderate use of drift pins, and a moderate amount of reaming and slight chipping or cutting, 

 shall be immediately reported to the Engineer and the work of correction done in the presence of 

 the Engineer, who shall check the time expended. The Contractor shall render an itemized bill 

 for such work of correction for the approval of the Engineer. 



13. Anchor Bolts. Holes for all anchor bolts, except where bolts are built up with the 

 masonry, shall be drilled by the Contractor after the metal is in place and the bolts shall be set 

 in Portland cement grout. 



14. Bed Plates. Bed plates resting on masonry shall be set level and have a full even bearing 

 over their entire surface; this shall be attained by either the use of Portland cement grout or 

 mortar, or by tightly ramming in rust cement under the bed plates after blocking them accurately 

 in position. 



15. Decks. The * will frame and place the permanent timber deck. 



16. Painting. The paint will be furnished by * and shall be of 



such color, quality and manufacture as may be specified. 



Surfaces inaccessible after erection, such as bottoms of base plates, tops of stringers, etc., 

 shall receive two coats of paint, allowing enough time between coats for the first coat to dry before 

 applying the second. No paint shall be applied in wet or freezing weather, nor when the surface 

 of the metal is damp. Painting shall be done in good and workmanlike manner, subject to strict 

 inspection during progress and after completion, and in accordance with special instructions 

 which shall be given by the Engineer. All metal shall be thoroughly cleaned of dirt, rust, loose 

 scale, etc., before the paint is applied. 



17. Clearing the Site. : The Contractor, after completion of the work of erection, shall 

 remove all old material and debris resulting from his operations and place the premises in a neat 

 condition. 



1 8. Superintendence and Workmen. During the entire progress of the work the Contractor 

 shall have a competent superintendent in personal charge and shall employ only skilled and 

 competent workmen. Instructions given by the Engineer to the Superintendent shall be carried 

 out the same as if given to the Contractor. If any of the Contractor's employes by unseemly 

 or boisterous conduct, or by incompetency or dishonesty, show unfitness for employment on the 

 work, they shall, upon instructions from the Engineer, be discharged from the work, nor there- 

 after be employed upon it without the Engineer's consent. 



* Insert "Railway Company" or "Contractor," as the case may be. 



