WIRE SAW EXCAVATOR, CUT-OFF WALL OR LANDSLIDE PROTECTION CONSTRUCTION CONSTRUCTED THEREBY AND CONSTRUCTION METHOD THEREOF

摘要

In the ground (T), preceding holes (3) are dug and also a portion between adjoining preceding holes (3) is excavated by use of a wire saw device (9) to thereby form a sheet insertion groove (4), into which a cut-off sheet (5) is inserted, while, engageable portions (7) provided at opposite end portions in the widthwise direction of the cut-off sheet (5) are positioned within the preceding hole (3), whereby the cut-off sheet (5) is pulled into the sheet insertion groove (4). Bentonite mortar is filled in the preceding hole (3) and the sheet insertion groove (4), which are brought into a water-tight state, to thereby form a cut-on sheet wall (I). The ground (T) is excavated by use of the wire saw device (9) and a sheet setting device (10) to thereby form the sheet insertion groove (4), while the cut-off sheet (5) is pulled into the sheet insertion groove (4), so that the working efficiency for constructing the cut-off sheet wall (1) is improved, and moreover, the insertion of the cut-off sheet (5) into the sheet insertion groove (4) can be easily and accurately performed, to thereby improve the construction accuracy.