DOUBLE ROW TYPE SHIELD EXCAVATING MACHINE

摘要

PURPOSE:To improve workability by arranging a plural number of rotary cutters with specified relative positions on a front end of a shield outer shell forming a double row circular arc section and arranging outer peripheral oscillating cutters around the rotary cutters free to reciprocally oscillate. CONSTITUTION:A plural number of rotary cutters 2 are arranged on the same flat surface on a front end part of a shield outer shell 1 arranged vertically by way of overlapping parts of a plural number of cylinders. In this case, the cutters 2 are arranged so that a circular arc center 01 of the outer shell 1 is made a rotational center and the outer periphery makes contact with a joining line (a) connecting a contracted part 1a. In case of drilling, the cutters 2 drill a circular part the outer periphery of which makes contact with the joining line (a). Additionally, ended cutout ring outer peripheral oscillating cutters 3 drill in a ring shape as their both end parts go in and out to and from the insides of their respective cutout parts 5 alternately. In case of branching, a tunnel having a horizontal part on it upper part or its lower part is drilled by drilling it circularly by the cutters 2 and drilling it partially in a ring shape within a limit not to exceed the joining line (a) by the cutters 3. Consequently, it is possible to carry out construction efficiently and simply.