| 摘要 |
PURPOSE:To bury a large-diameter caisson by means of a small-size excavator by a method in which projections for supporting the excavator are provided to the inside of the caisson, the protruded fixers of the excavator are fixed to the projections, and the excavator is orderly moved and fixed in the caisson. CONSTITUTION:Three or more projections 2 for supporting an excavator are provided at equal intervals in the inside circumferential direction of a caisson. Plural protruded fixers 10 of the excavator set biasedly from the center of the caisson are fixed to the projections 2, the excavator is fixed at the position 3A, and the ground is excavated in the range of 21A. The fixers 10 of the excavator are contracted to release the fixation of the excavator, the excavator is moved to the position of 3B, the fixers 10 are again fixed to the projections 2, and the ground 21B is excavated. The excavator is moved in the order of the positions 3C and 3D, and the grounds 21C and 21D are excavated. |
