ERECTION METHOD OF PC BRIDGE AND ERECTION GIRDER EMPLOYED THEREFOR

摘要

PROBLEM TO BE SOLVED: To make it possible to provide a specified rigidity and strength in an erection girder even when the elevation of the erection girder is subjected to limitations imposed by laying out a pair of reinforcing trusses below the main body of an erection girder and mounting turnably the reinforcing trusses around a horizontal longitudinal axis. ;SOLUTION: The main body 12 of an erection girder 11 is spanned over to a specified span and a pair of reinforcing trusses 13, which are located below the main body 12 and laid out as opposed alone the longitudinal direction of a bridge, are connected with each other with a PC steel rod 14. Then, one span of bride girder blocks 21 are placed side by side on the main body 12, thereby supporting the weight of the bridge girder blocks 21 with the reinforcing trusses 13 and the PC steel rod 14. Then, a prestress is introduced to a PC cable which is inserted through the bridge girder blocks 21, thereby integrating the bridge girder blocks 21. Then, the reinforcing trusses 13 are turned around the horizontal axis so that they may be jumped. After the erection girder 1 is moved to the next span, the reinforcing trusses 13 are turned in the opposite direction so that they may be returned to the position below the main body 12.;COPYRIGHT: (C)1997,JPO