| 摘要 |
PROBLEM TO BE SOLVED: To simply and effectively suppress ground deformation during the excavation of soft ground and the like. SOLUTION: After an earth retaining wall 10 and floor concrete 14 are constructed in the ground, the ground under the floor concrete 14 is excavated, and the inside of an underfloor space 24, which is generated by the excavation, is pressurized by feeding compressed air from a compressor 26. An anteroom 22 is provided at an entrance 20 to the underfloor space 24, and air pressure in the anteroom 22 is gradually changed when a worker goes in and out.
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