Erection of the Leas Highway Bridge near StJoseph, Ill. . ld bridge. Then a doublerow of old wooden stringers was placed, flat side down, upon thefloor beams just inside of each truss, and al3o a single row wasplaced midway between the trusses. The tension members of the Howetrusses were now loosened, care being taken to keep all of the rodsloose so that too much tension could not be taken by one rod andthus prohibit its easy removal. Loosening these rods allowed theweight of the floor beams and lower chord to come upon the false-work. An A-derrick was then constructed from old flooring boards
Erection of the Leas Highway Bridge near StJoseph, Ill. . ld bridge. Then a doublerow of old wooden stringers was placed, flat side down, upon thefloor beams just inside of each truss, and al3o a single row wasplaced midway between the trusses. The tension members of the Howetrusses were now loosened, care being taken to keep all of the rodsloose so that too much tension could not be taken by one rod andthus prohibit its easy removal. Loosening these rods allowed theweight of the floor beams and lower chord to come upon the false-work. An A-derrick was then constructed from old flooring boardssubstantially as shown in Fig. 4, page 6. Thi3 derrick was movedby hand, three men carrying it without difficulty. It was first setup at the center of the panel L L , Pig. 5, and the block fastenedto a chain about the upper chord of the old bridge. The end postwas then stayed by an inch piece as shown in ^ig. 5. All hands,seven in number, hauled away on the fall line while the foreman witha small pinch bar loosened the joint u,. After some difficulty at.
Size: 1373px × 1820px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1903
