Erection of the Leas Highway Bridge near StJoseph, Ill. . the re-moval of the old bridge, the latter will be somewhat briefly consid-ered. The bridge referred to is a pin-connected Pratt truss of thedimensions given in Pig. 1, page 2 . It is set upon masonry abut-ments, and may fairly be taken as a typical country highway old bridge consisted of a 90-foot pony Howe truss span in thecenter and a 15-foot span at each end. The spans rested upon cast-iron piles. The old bridge is shown by the photograph on the nextpage, as is also the configuration of the ground at the east end ofthe br
Erection of the Leas Highway Bridge near StJoseph, Ill. . the re-moval of the old bridge, the latter will be somewhat briefly consid-ered. The bridge referred to is a pin-connected Pratt truss of thedimensions given in Pig. 1, page 2 . It is set upon masonry abut-ments, and may fairly be taken as a typical country highway old bridge consisted of a 90-foot pony Howe truss span in thecenter and a 15-foot span at each end. The spans rested upon cast-iron piles. The old bridge is shown by the photograph on the nextpage, as is also the configuration of the ground at the east end ofthe bridge. The floor at the ends of the old bridge was torn up to buildthe abutments, but it was replaced and traffic resumed awaiting thearrival of the material for the new span. The material for the new bridge, when delivered at the site,was distributed as shown in Pig. 3, page 4. Removal of the Old BridgeThe first step in removing the old bridge was to take off the Digitized by the Internet Archive in 2013 Fig. I DIMENSIONS OF NEW BRIDGE. LIBRARY OF THE UNIVERSITY of ILLINOIS. Fig. L. OLD BRAD& LIBRARY OF THE UNIVERSITY of ILLINOIS. 5 I z uJ X 10 ? U? E m LJ z cr o jE id h £ o 8 si c «0 . jo V Nl * s> * ^ K H in ^ 8 Qit 2o h ? ui z i0 h D u5 a: 0 hJ 1 > _JD LIBRARY UN,v^si%THJt YoflL^ois 5 boxing from the Howe trusses and to remove the floor, placing thelumber at the east end near the bridge. Piling was procured from aneighboring farmer and placed (in bents of two) at points corres-ponding approximately to the panel points of the new bridge. Thecast-iron pipes of the old bridge were used as part of the false-work. The piles were braced with pieces of old flooring bolted diag-onally, one on each side of the bent. The cap of the bent consist-ed of two old flooring board3 bolted one on each side of the top of the cap was three inches below the bottom of the floorbeam of the old bridge. Two lines of old wooden stringers
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1903
