| 摘要 |
PURPOSE:To reduce a construction cost, by a method wherein, after high-pressure fluid is fed in a bag body inserted in a pit formed in a ground to increase the size of the hole through inflation of the bag body, ready mixed concrete is poured in the pit from which the bag body was removed. CONSTITUTION:After a boring pit 14 vertically extending from a ground surface to a bedrock 3 is bored in a soft ground 1, a bag body 15 made of a high resilient material is inserted into the pit 14. High-pressure fluid 20 is fed in the bag body 15 and the pit 14 is expanded in size through inflation of the bag body 15, and a pit wall is consolidated. After the bag body 15 is taken out of the pit 14, a large bag body 15a is inserted into the pit 14 and the high-pressure fluid is fed to further increase the size of the pit 14. Further, after the pit 14 is increased in size and consolidated through inflation of the bag body 15, where necessary, and the bag body 15 is removed, ready mixed concrete is poured in the pit 14 to form a concrete pile 30. |
