WOODEN BRIDGE EMPLOYING OUTER CABLE-BASED PRESTRESSED LAMINATED LUMBER BRIDGE GIRDER, WOODEN BRIDGE OVERHANGING ERECTION METHOD BASED ON OUTER CABLE SYSTEM, AND WOODEN BRIDGE GIRDER CONSTRUCTED ACCORDING TO THE OVERHANGING ERECTION METHOD

摘要

PROBLEM TO BE SOLVED: To form a laminated lumber bridge girder which is enhanced in resistance to deflection, and to construct a long-span wooden bridge by employing the laminated lumber bridge girder.;SOLUTION: In the wooden bridge which employs long beams made of laminated lumber as the main girder, prestress is applied to the laminated lumber main girder according to an outer cable system, by attaching angle-type anchorage fixtures and wooden anchorage blocks to the main laminated lumber girder. To implement an overhanging erection method, the laminated lumber long beams to which prestress has been applied according to an inner cable system are piled up on bridge piers while the number of the beams to be connected is progressively increased. Further, whenever a new upper stage is piled up, outer cables are attached to the connected beams which are set in the new upper stage, to thereby apply prestress to the connected beams, and at the same time the long beams in the upper- and lower-stages are fixed to each other by a plurality of deviation inhibiting fixtures. In this manner the bridge girder is overhangingly erected.;COPYRIGHT: (C)2004,JPO