| 摘要 |
PROBLEM TO BE SOLVED: To accurately correct unevenness of a wall surface 2 and the like on the upper stream side of a body 1 of dam with high efficiency.SOLUTION: Guide rails 11 and 12 are installed in a vertical direction along a wall surface 2. An excavator 20 is hung by a crane 30, and lifted/lowered along the guide rails 11 and 12. The excavator 20 comprises a part (endless roller 25) abutting on the guide rails 11 and 12, and an excavation part (twin header 26) for excavating the wall surface 2. Additionally, a reaction reception mechanism (wire 32) for receiving reaction from the wall surface 2, for example, by supporting the excavator 20 from its rear side is provided.SELECTED DRAWING: Figure 1 |
