| 摘要 |
<p>A shield excavator for constructing a tunnel, a hole, a groove and the like having a polygonal, preferably, square section. The excavator (10) comprises: a cylindrical shield body (12) having a polygonal sectional shape; a cutter assembly (18) disposed at a forward end portion of the shield body (12) so as to be reciprocatingly movable in a first direction intersecting at least the axial line of the shield body (12); and a driving mechanism (16) for driving the cutter assembly (18). The cutter assembly (18) includes: a plurality of serrated cutters (66) disposed at the forward end of the shield body (12) at intervals in a second direction intersecting the axial line of the shield body (12) and the first direction and extending in the first direction, or a plurality of plate-shaped cutters (68) disposed at the forward end of the shield body (12) at intervals in the first direction and extending in the second direction.</p> |
