NATURAL GROUND CUTTING DEVICE

PROBLEM TO BE SOLVED: To provide a natural ground cutting device eliminating the need of installing a guide rail, and capable of increasing the workability and shortening construction time of cutting execution, in a device having a pulley supporting mechanism traveling in a guide pipe and cutting a natural ground by a flexible cutting tool such as a wire saw wrapped around the pulley supporting mechanism. SOLUTION: The natural ground cutting device comprises the pulley supporting mechanisms 6a, 6b respectively in a pair of guide pipes 5a, 5b horizontally installed on the natural ground so as to move in a pipe axial direction, and supporting cutting pulleys 11a, 11b; the wire saw wrapped around the cutting pulleys supported by these pulley supporting mechanisms so as to cross the natural ground between the guide pipes. The pulley supporting mechanism has holder portions 16 disposed in its front and rear positions so as to be orthogonal to the pipe axis. A plurality of traveling members 19 traveling while contacting inner peripheral surfaces of the guide pipes 5a, 5b is provided on the outer periphery of each holder portion at intervals in a circumferential direction. COPYRIGHT: (C)2008,JPO&INPIT