PROBLEM TO BE SOLVED: To shorten the erection/demolition construction period with a cable by inserting the cable into a bridge girder block, releasing the fixation to the cable as the blocks are connected, and shifting the block fixing position for each block. ;SOLUTION: The third bridge girder block 4c to be connected next is hoisted by a small crane installed on an existing bridge girder 40, conveyed onto the bridge girder 40, lowered to the same plane, and coupled and connected. A jack 11 at the center is loosened, and the anchor plate of a block 4b is loosened and extracted together with a shim plate. An anchor plate is fastened and fixed by a bolt at the tip of the cable 5, and the shim plate is inserted between the anchor plate and a box draw section side wall. The fixing position of the cable 5 at the center is shifted from the block 4b to the block 4c by the replacing action of the shim plate. The existing bridge girder 40 is extended in the erecting direction for each block, both ends of the continued bridge girder 40 are suspended between abutments 3 on both shores, and the work can be easily shortened.;COPYRIGHT: (C)1998,JPO
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