| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method for an underground structure wherein construction term and construction costs are reduced, a large underground effective space can be assured and global environment is taken into consideration. SOLUTION: A trim beam 6a is installed at the central part of the story height of an existing basement outer wall 1w of the first basement. After the trim beam 6a is installed, a preload P<SB>1</SB>is applied to the beam 6a by a jack. Then, a floor beam 1b together with a beam form 1c of the first basement of the existing underground structure 10o is removed with leaving the existing basement outer wall 1w as it is. The series of the above operations are repeated on the second basement and the third basement. An additional wall 13a is laid to the existing basement outer wall 3w from the inner side to construct a combined wall 13w with the existing basement outer wall 3w. Then, a floor beam 13b of the second basement is constructed. After the strength of the additional wall 13a is developed, the trim beam 6c and a waling 7c are removed. The series of the above operations are repeated on the second basement and the first basement to complete the construction of a new underground structure 10n. COPYRIGHT: (C)2005,JPO&NCIPI
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