Tunnel-excavating machine with shield formed of segments

Details Tunnel-excavating machine with shield formed of segments Tunnel-excavating machine with shield formed of segments

1977-10-03

1979-02-20

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Stabilizing underground structure

299 31, 299 33, 405142, E21D 908

Patent

active

041403452

ABSTRACT:
A tunnel-excavating machine comprises an excavating head, preferably a full-cut head, adapted to excavate the full-cross-section of the tunnel to be formed, which is slideably mounted for movement relative to a pair of support frames. Means is provided to relatively displace the support frames axially and the support frames are surrounded by a blade shield made up of a multiplicity of individual blade segments, each of which can be individually advanced by hydraulic means connected to the support frames. The individual blade members, which span both frames, can be urged against the wall of the tunnel by respective fluid pressure means in each of the frames.

REFERENCES:
patent: 3800549 (1974-04-01), Lobbe

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