Non-entry method of underground excavation in weak or water...

Details Non-entry method of underground excavation in weak or water... Non-entry method of underground excavation in weak or water...

E - Fixed Constructions

21

C

E21C 25/60 (2006.01) E21B 36/00 (2006.01) E21B 43/29 (2006.01) E21C 41/16 (2006.01) E21D 1/14 (2006.01)

Patent

CA 2118988

There is described a method of excavating an underground area liable to flooding or collapsing during excavation, wherein the area is susceptible to disaggregation by high pressure water jet and is located above rock of strength suitable for drifting a gallery. The method comprises drifting a gallery in the rock beneath the area, freezing at least a perimeter of the area to form a frozen perimeter, and excavating material from within the frozen perimeter using a high pressure water jet and access means, eg. borehole(s) between the gallery and the area. Preferably the whole area is frozen for excavation.

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