END CUTOFF TYPE PRESTRESSED COMPOSITION BRIDGE WHICH STAIRS TYPE STRAIN EQUIPMENT POSSESSES, AND ITS CONSTRUCTION METHOD

摘要

A stair shaped end prestressed composition beam with fixing devices and a bridge construction method using the same are provided to disperse tensile force of the beam and to prevent local fracture of casing concrete by connecting steel wires with ends of the fixing devices. A stair shaped end prestressed composition beam comprises prestressed synthetic beams, and fixing devices(20). The prestressed synthetic beams are introduced by pouring concrete, installing lower casing concrete, and removing load to surround steel beams and lower flanges with predetermined thickness. The fixing devices includes fixing tools(22) fixed at upper and lower parts of the stair shaped ends, and steel wires(24) crossing the fixed areas. A cut part(18) is shaped like a stair. A width(‘±) of the cut part is a value of adding a width from an end of the steel beam to a rear end of the bridge device with a width from the rear end of the bridge device to the rear end of the abutment and of adding the length with 10 to 20cm more.