| 摘要 |
<p>PURPOSE:To correct a main unit for its rolling by pivotally mounting to the front end part of a shield main unit one or more pairs of movable plates and containing the paired movable plates, having a pivotal axial line in a cross section at a right angle with the axial line of the shield main unit, to be arranged in the point symmetry with respect to one point on the axial line. CONSTITUTION:A shield main unit 14 provides from its opening front end part 15 to the rear a partition 16, and a cutter head 18 is provided with a spoke 20 and a bit 22 extending in a radial direction from a point on an axial line of the main unit 14. Next the cutter head 18 rotates excavating with the main unit 14 debris stored in a cutting chamber 28 between the cutter head 18 and the partition 16 via between constitutional parts of the spoke 20. An attitude control device 10 is pivotally mounted to the front end part 15 of the main unit 14, and with respect to one point of its axial line A arranging in the point symmetry one or more pairs of movable plates 32 contained, the debris is discharged by a screw conveyer 30 having one end opened in its lower part to the cutting chamber 28 and the other end extending to the rear. In this way, rolling can be corrected.</p> |
