Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent
1978-11-01
1981-04-07
Pate, III, William F.
Mining or in situ disintegration of hard material
Processes
Stabilizing underground structure
175 15, 299 14, 299 33, 299 60, E21C 2724
Patent
active
042601940
ABSTRACT:
A method of producing an underground cavity in a driving shield advance operation comprises, prior to excavation, forming an annular slot corresponding to the contour and wall thickness of the shield ahead of the shield by using hot gas jets to form the slot and to separate a core from the surrounding rock formation, advancing the shield into the annular slot, and breaking out the core under the protection of the shield. The device for producing the underground cavity comprises a tubular drive shield adapted to be advanced into the cavity and having an interior support wall on which is rotatably supported a support member having an arm carrying a gas jet lance. The gas jet lance advantageously includes at least one gas nozzle directed forwardly to form an inwardly extending cavity ahead of the shield, and one or more nozzle discharges directing the gas laterally. The jet nozzle is rotated after it is advanced into the ground, and the gas jets form an annular slot ahead of the shield which accommodates the shield therein. The shield is then moved into the slot by the usual shield advance cylinders. Walls behind the shield are braced by a lining wall which, for example, may be thin walled rings which may be positioned in place.
REFERENCES:
patent: 2018926 (1935-10-01), Schroepfer
patent: 2426688 (1947-09-01), Higgs
patent: 3245721 (1966-04-01), Margiloff
patent: 3325217 (1967-06-01), Enz
patent: 3596995 (1971-08-01), Fitzegerald
patent: 3603100 (1971-09-01), Cowley
patent: 3791697 (1974-02-01), Hokao
patent: 4043137 (1977-08-01), Jutte
patent: 4077670 (1978-03-01), Spies et al.
Blindow Friedrich-Karl
Decker Jurgen
Kluibenschedl Heinrich
Munding German
Sowa Armin
Messerschmitt-Bolkow-Blohm GmbH
Pate III William F.
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