| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enhance the stability of a caisson structure, which is installed underground, by erasing the friction reduction effect of the ground around a caisson after the caisson structure is constructed in a caisson method in which the slide contact resistance between the ground and the caisson is reduced by using a friction reduction sheet. <P>SOLUTION: In a ground modification method in a caisson method, when a caisson structure of a prescribed depth is constructed while a caisson skeleton is sunk down underground by every prescribed stroke, an invalidating processing of friction reduction effect is performed for erasing the friction reduction effect of a friction reduction material of a friction reduction sheet in the caisson structure formed by interposing, between the ground and the caisson skeleton, the friction reduction sheet having the friction reduction material for reducing the slide contact resistance between the ground and the caisson skeleton and sinking down the caisson skeleton. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
