Tail structure of shield driving machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 25, 2000
Grant Date -
N/A
app pub date -
Nov 3, 1998
filing date -
Nov 18, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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