| 摘要 |
PROBLEM TO BE SOLVED: To shorten a construction period, improve working efficiency, and reduce construction cost by installing a wire saw driving device on a floor slab surface.SOLUTION: A starting point groove 42 which is larger than the width of a flange 21 in the width direction and reaches a bridge girder upper face from the surface of a concrete slab 1 is formed at a starting point S of horizontal cutting. Through-holes 40 penetrating the concrete slab 1 are formed at larger interval than the width of the flange 21 of a bridge girder 2 are formed at a terminal point E of the horizontal cutting. A wire saw 5 is dropped into the starting point groove 42, routed under the concrete slab 1 up to the through-holes 40 at the terminal point E, and drawn to the upper side of the concrete slab 1 through the through-holes 40, and both ends thereof are connected together to make an endless state. The wire saw 5 is driven to run by a wire saw drive unit 6 to horizontally cut a boundary surface between the bridge girder 2 and the concrete slab 1 and release their connection, and the concrete slab is cut into a suitable size and removed. |
