| 摘要 |
PROBLEM TO BE SOLVED: To provide an immersion construction method for reducing a construction cost, having a high construction speed, having a simple coupling structure of blocks, making the minimum necessary thickness of a pipe thickness capable of enduring soil pressure and facilitating position control of a sewer pipe connection opening without leaving a steel casing. SOLUTION: In the immersion construction method of a shaft, the steel casing 2 is inserted in the insides of a plurality of connected concrete-made shaft construction blocks 1, a cutting edge 3 whose outside diameter is larger than that of the shaft construction block 1 is mounted on the lower end, the upper part of the steel casing 2 is set on a shaft excavation rotation press-in machine 4 through a cap 6, dug to be pushed into underground while rotation press-in force is applied, and after the shaft construction block 1 is put down to a prescribed position, the steel casing 2 is pulled.
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