| 摘要 |
PROBLEM TO BE SOLVED: To provide the structure of a diaphragm wall, in which construction cost is reduced and the term of works is shortened. SOLUTION: In the diaphragm 1 used as the earth retaining of an underground structure, an approximately truncated-shaped bottom expanding section 2 is formed to the lower section of the diaphragm 1 at a specified space. A ditch for the diaphragm is excavated and the bottom expanding section 2 is excavated to the lower section of the excavated ditch by using an excavator, in which a bottom expander is installed at a front end, or a vertical pit containing the bottom expanding section 2 is excavated previously and the ditch is excavated so that the bottom expanding section 2 is formed as a lower section. Slime in the ditch, to which the bottom expanding section 2 is formed, is removed while a cage is disposed and the diaphragm wall is formed by placing concrete. Since floating resistance force to ground water is increased by the bottom expanding section at that time, the wall thickness of the diaphragm can be formed thinly.
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