| 摘要 |
PURPOSE:To easily remove a temporary cut-off wall after the completion of installation work of caisson by a method in which a RC structure of temporary cut-off wall to be divided in the vertical direction is constructed integrally with the top of a caisson, and an explosive hole and a fissure hole are formed in the dividing line of the cut-off wall. CONSTITUTION:A caisson 2 is settled to a given depth, and a RC structure of temporary cut-off wall 1 dividable into plural pieces 6 vertically is constructed on the top of the caisson 2. The caisson 2 is further settled. In removing out the wall 1 after the construction of a top slab 4 and a pier 5, an explosive is charged into each explosive hole 18 previously formed in the dividing lines of each piece 6 and exploded, whereupon fissure holes 17 are formed in the dividing lines and cracks are developed among the pieces 6 constituting the temporary cut-off wall. The cut-off wall 1 can thus be easily removed out by a bulldozer, etc. |
