Tunnel boring machine
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United States of America Patent
Stats
-
Oct 17, 1989
Grant Date -
N/A
app pub date -
Dec 15, 1987
filing date -
Dec 18, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Telescopic tunnel boring machine including a front shield (10) and a rear shield (16) with a cutting head (14) at the forward end of the front shield. Rearwardly extending shutters can be moved out hydraulically by auxillary cylinders (54) from the rear end of the rear shield to bridge the gap (34) between this rear end and tunnel lining elements (32). Additionally expandable cuffs (70) and (72) may be provided on the front and rear shields respectively behind the cutting head (14) and radial tunnel wall grippers (20).
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