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Rimbearing highway swing span
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arrangement assumed attached balance Bascule bridge base bearings becomes bottom built carried cent center-bearing channel Chicago chord clear closed concrete connected continuous counterweight cross deck deflection diameter direction discs draw draw bridges driven drum elevation engine equal extending Feet Figure fixed floor foot four frame gear girders given heavy highway horizontal inch joint leaf leaves length lift live load locks lower machinery masonry maximum mechanism method middle moment moments motors movable moving operating panel pass pier pivot placed plates position Pounds pressure rack rail railway reactions rim-bearing River roadway rollers ropes shaft shear sheaves shown shows side Specifications square steel stress structure struts supports swing bridge swing spans TABLE tower track traffic transverse trunnions trusses turning unit upper values vertical wedge weight wheels