| 摘要 |
<p>A shielded tunnel excavator having a rotary cutting disk (13) rotatably carrying a plurality of cutter rollers (12) for cutting engagement with the face (43) of a tunnel under excavation and rotatably mounted to one end of a substantially tubular shield (11, 18, 26), and drive means (14, 15, 16) within the shield for imparting rotation to the cutting disk (13) and hence for excavating the tunnel face by the cutter rollers. For trouble-free, efficient tunneling with a minimum of rolling, the shield is constituted of a head section (11) having front anchor means (25), an inner section (18) telescopically nested in the head section (11) and constrained to axial displacement relative to the same while being rigid ly restrained from relative angular displacement about the shield axis, and a tail section (26) having rear anchor means (28) and coupled to the inner section (18) for both bending and rolling movements relative to the same. Hydraulic push jacks (29) are connected between the head section (11)and tail section (26) of the shield for advancing the same, and a pair of antirolling jacks (30) are connected between the inner section (18) and tail section (26) of the shield and disposed in a plane at right angles with the axis of the shield.</p> |
