| 摘要 |
PROBLEM TO BE SOLVED: To provide a caisson immersion method based on a pneumatic caisson method, capable of ensuring an upper construction space and preventing sediment, ground water, and air from ejecting at low cost.SOLUTION: In a caisson immersion method, a water stop device with a water stop member 4 made from an elastic material and a pressing member 8 that is disposed to contact to the water stop member 4 and restrict a movement of the water stop member 4 upward is formed on an inner peripheral surface of a cylindrical body 1. The cylindrical body 1 is installed so that an opening of the cylindrical body 1 is positioned in vertical direction to the ground. Then, a cutting edge 31 of a caisson skeleton and the caisson skeleton are made to pass through the cylindrical body 1 while an outer surface of the caisson skeleton 30 is made to contact with an inner peripheral edge of the water stop member 4, and the caisson skeleton 30 is made to immerse into a predetermined depth.SELECTED DRAWING: Figure 10 |
