| 摘要 |
PROBLEM TO BE SOLVED: To provide a building construction method of an underground structure capable of extremely efficiently and economically performing up to construction of a new underground structure from disassembling of an existing underground structure without using earth retaining timbering such as a strut. SOLUTION: In the first place, an earth retaining wall 2 is constructed on the outer periphery of the existing underground structure 1. Next, a central part A of the existing underground structure 1 is disassembled with an outer peripheral part B of the existing underground structure 1 as a support of the earth retaining wall 2. Next, afterwards, a steel framework 8 of a new underground structure is constructed as a central part of the new underground structure. Next, the outer peripheral part B of the existing underground structure 1 is disassembled with this steel framework 8 as the support of the earth retaining wall 2. An outer peripheral part B of the new underground structure is constructed thereafter. When disassembling the outer peripheral part B of the existing underground structure 1, respective stories of B1F, B2F, B3F and B4F are disassembled in order toward the lowest story from the upper story, and at the same time, floors 9A, 9B, 9C and 9D of the respective stories of B1F, B2F, B3F and B4F are constructed in order toward the lowest story from the upper story as the outer peripheral part B of a new structure.
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