PROBLEM TO BE SOLVED: To stabilize a wall body by the small depth of embedment by forming a columnar continuous underground wall by cast-in-place construction by grout injection up to the specified depth of embedment and bearing the lower foot section of the wall by a continuous ground beam. SOLUTION: Soil-cement columnar-body continuous underground walls 1, 1', 2, 2' are formed by cast-in-place by grout injection up to the depth of embedment of the half or lower of pit design depth from a ground surface along the plane contour of a designed pit. Steel core materials are extended and reinforced along a proper number of major axes of the underground walls 1, 1', 2, 2', and underground-wall fixing treatment including waling consisting of the successive stretching of beams in the vicinity of the upper ends of the steel core materials is executed. A soil-cement columnar-body continuous ground beam 3 is formed by cast-in-place by grout injection at the level of a pit designed base stretched between the penetration sections of the opposed underground walls 1, 1'. A bedrock surrounded by the underground walls 1, 2 is excavated up to specified depth, and the pit is formed.
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