The Strauss Bascule Bridge Company, Inc., engineers and designers of trunnion, bascule and direct lift bridges. . ither i this v Thi raffia driven, controlled from interlocked with the leaf nechanism is quite similar I; the operation of botha single operators house, the operators house anmotors. The operatingto that described in tinweight type under Groleaves is controlled frorshowing at the right hand side of the i A characteristic feature of the underneathcounterweight type is the absence of openings, ortraps, in the roadway floor as the bridge break in floor, i. e., the dividing l
The Strauss Bascule Bridge Company, Inc., engineers and designers of trunnion, bascule and direct lift bridges. . ither i this v Thi raffia driven, controlled from interlocked with the leaf nechanism is quite similar I; the operation of botha single operators house, the operators house anmotors. The operatingto that described in tinweight type under Groleaves is controlled frorshowing at the right hand side of the i A characteristic feature of the underneathcounterweight type is the absence of openings, ortraps, in the roadway floor as the bridge break in floor, i. e., the dividing line betweenthe floor on the fixed approach span and on thebascule leaf, is located in front of the main trun-nions so that in opening the bridge no part ofthe floor revolves downward. The leaf itself,therefore, forms a positive barrier against traffic,thus preventing accidents similar to those occur-ring at the open ends of the ordinary drawbridge. Figure 9 (a) and (1>) illustrates a double leafdeck truss bascule bridge built across the ChicagoRiver at Jackson Blvd., Chicago, III., completed1916. This str. underneath counterweight type of Strauss Trun-nion Bascule Bridge. The method of operationis quite similar to that of the bridge illustratedin Fig. 4, described above, the dead load of the leafbeing balanced about the main trunnion, but themethod of providing for the support of live load onthe- leaf differs, as follows: The bascule leaf whenclosed, comes to a bearing at a point on the sub-structure 10 feet ahead (toward center of span) ofthe main trunnion, a hinge-like casting beingsecured to the bottom flange of each bascule trussmm\ a socket-like casting secured to a casl shoianchored to the masonry, forming a means of support at this point. Under live load the leafwill, therefore, tend to lift up slightly from themain trunnion bearings, the live load supportcastings acting as a fulcrum for both the leaf and The Strauss Bascule Bridge Company
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Keywords: ., bookcentury1900, bookdecade1920, bookidthestraussba, bookyear1920
