| 摘要 |
PROBLEM TO BE SOLVED: To provide a replacement method for a concrete floor slab of an overpass that flexibly copes with diverse road regulations and may be executed in a short work period at a low cost.SOLUTION: When replacing a concrete floor slab for an overpass, replacement sections are set that are made by dividing an existing concrete floor slab for a plurality of lanes into a primary working part 20a and a secondary working part 20b in a road width direction. While offering the secondary working part 20b for use as a road, an existing concrete slab removing step and a precast slab installation step are implemented while moving an erection device 50 in a road length direction for constructing a PC floor slab on one side, the existing concrete slab removing step being for demolishing and removing an existing concrete floor slab 40 of the primary working part 20a located between gate-form pier parts 51, 51 using the erection device 50, and the precast slab installation step being for shifting a pre-tension precast PC slab 23 to a desired location between the gate-form pier parts 51, 51 and installing the pre-tension precast PC slab 23 in the primary working part 20a. Then, the PC floor slab on one side is offered for use as a road.SELECTED DRAWING: Figure 7 |
