Title:
BLASTING METHOD FOR FORMING UNDERGROUND SPACE
Document Type and Number:
Japanese Patent JP3119979
Kind Code:
B2
Abstract:
PURPOSE: To excavate an underground space having a smooth wall surface with high executability when the space of a tunnel, etc., is excavated at a baserock by blasting.
CONSTITUTION: When a bore hole 2 of a long hole shape and a blasting hole 3 of a circular shape are perforated at each specific interval along an outer peripheral side 1 of a scheduled tunnel T, the hole 2 is perforated at a part in which a discontinuous surface 5 such as a joint, a fault, etc., existing at the baserock is crossed at the side 1, and the hole 3 is perforated at a position shorter than a distance from an end of the bore hole to the surface 5 along the side. Gunpowder is charged in the hole 3 and blasted to form a tunnel wall surface along the side 1 and to excavate the baserock surrounded by the wall surface by blasting.
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Inventors:
Kenji Hagimori
Tadashi Masumoto
Tadashi Masumoto
Application Number:
JP26983093A
Publication Date:
December 25, 2000
Filing Date:
October 01, 1993
Export Citation:
Assignee:
Okumura Gumi Co., Ltd.
International Classes:
F42D1/00; E21D9/00; (IPC1-7): F42D1/00; E21D9/00
Domestic Patent References:
| JP5231088A | ||||
| JP5937394B2 |
Attorney, Agent or Firm:
Takuya Yamamoto