Expanded steel pipe pile and expanded bottom integrated steel pipe

摘要

The present invention provides a steel pipe pile with an expanded bottom capable of forming a sufficiently large expanded portion with a simple structure and obtaining a large supporting force, and an integrated steel pipe with an expanded bottom that can improve construction efficiency. A shaft steel pipe that is a pile steel pipe main body, an expanded bottom steel pipe larger in diameter than the shaft steel pipe connected to a lower end of the shaft steel pipe, and a circular steel pipe joined to a lower end of the expanded steel pipe. It comprises a tip member 4 which serves as an excavating bottom and at the same time exerts an excavating driving force. It is not a structure in which the shaft steel pipe is directly joined to the tip member, but a structure in which it is joined to the tip member by interposing a steel pipe with a larger diameter than the shaft steel pipe. It is possible to obtain a large supporting force as an expanded steel pipe pile. [Selection diagram] Fig. 1