| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for constructing a square basement with the same simplicity as that possible when constructing a basement by means of a circular casing by using a square casing to eliminate the inconveniences of the cylindrical basement. SOLUTION: Four sets of linearly reciprocating digging blades are provided at a lower end of the square casing, and the lower end of the square casing is digged and pressed in simultaneously to construct a square shaft. Pressurization, digging of the inside of the square casing, and discharge of the soil are done by an exclusive square shaft excavation device. The digging blades and their driving device are removed after excavation is completed for repetitive use.
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