| 摘要 |
PROBLEM TO BE SOLVED: To take an economical countermeasure against a uplift pressure with out causing the change of peripheral environment. SOLUTION: Concrete is placed in an excavated ditch 12, and an earth retaining wall 32 is formed when the concrete is hardened. When the formation of the earth retaining wall 32 is completed, internal pit excavation is performed. Upon the completion of pit excavation, a jack 24d is actuated to project a bottom slab support part 24 onto the pit excavation side. In this projecting state, the extension stroke of the jack 24d is set to make shearing reinforcing bars 24c straddle the earth retaining wall 32 and a bottom slab 34 to be formed. The bottom slab 34 is formed by concrete placing in water, and jointing between the earth retaining wall 32 and bottom slab 34 is completed when the placed concrete is hardened.
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