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SPECIFICATIONS FOR STEEL IN BRIDGES, ETC.257

 

against other webs must be faced true and square or to exact bevel; and the end-stiffeners must be placed perfectly flush with these planed ends, so as to afford a proper bearing. Filling-plates beneath end stiffening angles must be practically flush with said angles, and must in no case project outside of same at the bearings. If a good and satisfactory job of work cannot be obtained by this method, the end-stiffening angles shall be made one eighth (1/8) of an inch thicker, and the entire ends shall be planed after the stiffening angles are riveted on.

No web-plate will be allowed to project beyond the flange angles, or to recede more than one eighth (1/8) of an inch from faces of same.

All filling and splice plates in riveted work must fit at their ends to the flanges sufficiently close to be sealed, when painted, against the admission of water; but they need not be tool-finished, unless so specially indicated either on the drawings or in the specifications. Edges of spliced web-plates must be faced so as to provide close contact throughout the entire depth.

EYE-BARS.

Except in the case of loop-eyes, no weld will be allowed in the body of the eye-bars. The heads of the eye-bars shall be made by upsetting, rolling, or forging into shape. A variation from the specified dimensions of the heads will be allowed, in thickness of one thirty-second (1/32) of an inch below and one sixteenth (1/16) of an inch above that specified, and in diameter of one fourth (1/4) of an inch in either direction. Eye-bars must be perfectly straight before boring.

Loop-eyes shall invariably be made of wrought iron, as steel cannot be relied upon to afford a proper weld.

PINHOLES.

All pinholes must be bored truly parallel and at right angles to the axes of the members, unless otherwise shown on the drawings; and, in pieces not adjustable for length, no variation of more than one thirty-second (1/32) of an inch will be allowed in the length between centres of pinholes.

 

 

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