PURPOSE: To build space in superdeep underground by providing a primary lining in a gap made as a result of cutting the outside circumferences of multiple stages made by dividing an imagined underground space upon excavating a vertical shaft from the ground surface and by providing a second lining all around the space after removing the earth therein.
CONSTITUTION: Upon excavating a vertical shaft toward an imagined underground space S, a gap C and in sequence from the top divided stages d1... are cut with a back hoe 14 equipped with a chain cutter 12 along the outside circumference of the underground space S. A primary lining is performed next by injecting an lining material 16 into the gap C using an injector 18. Earth inside the space enclosed with the primary lining material 16 is excavated and removed by each divided stage d1 employing an excavator and, after solidifying the base with a second lining material 24, the inner side of the primary lining material 16 is successively solidified by using a form 26. Finally then the superdeep underground space S is constructed. Thus the earth can be protected from being destroyed.
TANAKA KIICHIROU
ENDO TAMOTSU
YAMAMOTO YUKINOBU
| JPH02112600A | 1990-04-25 | |||
| JPH01312116A | 1989-12-15 |