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Machine translation
1. (WO1980001931) PROCESS AND APPARATUS FOR PULVERIZING BASE ROCK
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001931    International Application No.:    PCT/JP1979/000299
Publication Date: 18.09.1980 International Filing Date: 22.11.1979
IPC:
E21C 37/06 (2006.01)
Applicants:
Inventors:
Priority Data:
79/28210 13.03.1979 JP
Title (EN) PROCESS AND APPARATUS FOR PULVERIZING BASE ROCK
(FR) PROCEDE ET APPAREIL DE PULVERISATION DE LA ROCHE
Abstract: front page image
(EN)A process for preliminary pulverizing base rock by the step of injecting high pressure water into a crack which has naturally occurred in the base rock, thereby to expand the crack. This process comprises the steps of boring a hole into the base rock by a boring rod having a plurality of boring blades mounted at the end thereof, sealing the end of the rod using gravel produced upon boring of the base rock, introducing a highly viscous fluid from the end of the rod into the sealed hole end to block the natural crack in the base rock, and finally injecting high pressure water or a high pressure and highly viscous fluid from the end of the rod to expand the crack. The base rock preliminarily pulverized can be finely pulverized with facility by means of a ripping operation. Also disclosed is an apparatus for adequately executing the preliminary pulverization of the base rock.
(FR)Un procede de pulverisation preliminaire de la roche consiste a injecter de l"eau a haute pression dans une fissure qui s"est produite naturellement dans la roche pour agrandir la fissure. Ce procede consiste a percer un trou dans la roche a l"aide d"une tige de percage ayant une pluralite de couteaux de percage montes a son extremite, a obturer l"extremite de la tige en utilisant du gravier produit par le percage de la roche, a introduire un fluide tres visqueux par l"extremite de la tige dans l"orifice bouche pour fermer la fissure naturelle de la roche, et finalement a injecter de l"eau a haute pression ou un fluide a haute pression et hautement visqueux par l"extremite de la tige pour agrandir la fissure. La roche apres une premiere pulverisation peut etre finement pulverisee par dechirement ou refente. Un appareil pour executer de maniere appropriee la premiere pulverisation de la roche est egalement decrit.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)