Identifier: erectionofleashi00burk (find matches)
Title: Erection of the Leas Highway Bridge near St. Joseph, Ill.
Year: 1903 (1900s)
Authors: Burkhalter, Wayne Edison
Subjects: Bridges Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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be able to recognize it at once, and he roust alsoknow the size of each pin. The foreman has very little time to studythe plans in the field, and this work he must do in the evening thathe may not delay the work. The lower chord wa3 now connected, the men working in two squadsof three each, on each truss. Beginning at one end, the lower chordwas laid on the falsework as close as possible to its final position.The pin for the joint L,, for example, was first brought out and bothnuts removed. The members were now placed upon this pin with theproper pin fillers, part of the members being placed upon the pinfrom each end. The nuts were then screwed on and tightened. Thejoint next in order was then connected. Not only the lower chord,but also all other members, posts, diagonals, and counters, wereplaced on the pins, care being taken that the packing, that 13, theorder and spacing of the pieces on the pins, was correct. If anyfloor beam was not in the proper place to receive the members, it
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Fig. 8- ERECTION OF INTE.RM ED I RTE POST. was moved with a pinch bar or a sledge, or if a chord member was toolong by a small amount, the latter was bent out at the center. Alltension members were connected without the use of pilot nuts on thepins. Each pin was carried from the box on the bank when it wasneeded, and great care was taken that no pieces fell into the river,as no duplicate parts were furnished. The wrenches for the pins hada steel handle about 18 inches long. This handle was about 3/8 inchin diameter at the end and 3/4 inch in diameter near the wrench.This handle wa3 used as a pilot bar and was of great assistance inplacing the members on the pin. The bar was run through all membersin order before the pin was started and they were thus held closelyto place. The top chord w»s next run out on the falsework. To do thisthe men laid a runway of plank from the falsework to about the mid-dle of a section of the top chord. The dolly was then placed on therunway, roller down. A

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