Tail structure of shield driving machine

Details Tail structure of shield driving machine Tail structure of shield driving machine

1998-11-03

2000-07-25

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

405138, 405141, E21D 906

Patent

active

060929634

ABSTRACT:
The present invention relates to a tail structure of a shield driving machine, and in particular relates to an improvement technique of the tail sealing portion of this type of shield driving machine, in order to eliminate wearing of the tail seal. The tail structure has a first tail seal 12 and a second tail seal 14. The first tail seal 12 is provided with a tail ring 12a, a seal tube 12b and packing 12c, and the tail ring 12a is secured movably in the axial direction of a skin plate 10. The packing 12c is pressure-fitted to segments 11 in line with enlargement of the seal tube 12b and is spaced from the segments 11 in line with reduction of the seal tube 12b. The second tail seal 14 is provided with a seal tube 14a and packing 14b, wherein the packing 14b is pressure-fitted to the segments 11 in line with enlargement of the seal tube 14a and is spaced from the segments 11 in line with reduction of the seal tube 14b. When excavating, the packing 14b causes the first tail seal 12 to be pressure-fitted to the segments 11 without moving the first tail seal 12, and causes the second tail seal 14 to be spaced from the segments 11.

REFERENCES:
patent: 748809 (1904-01-01), Stone
patent: 1296312 (1919-03-01), O'Rourke
patent: 3410098 (1968-11-01), Winberg
patent: 4003211 (1977-01-01), Klapdor et al.
patent: 4990027 (1991-02-01), Hattori et al.

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