Steel pipe pile

Abstract

This steel pipe pile is used as a foundation pile for a structure, and is provided with a cylindrically shaped principal steel pipe which has a cavity in the inside; and an internal circumferential steel pipe which has a cavity in the inside, is provided on the inner surface of the tip section of the principal steel pipe, and is disposed in such a way as to protrude from said tip section of said principal steel pipe. The inside diameter of the principal steel pipe is larger than the inside diameter of the internal circumferential steel pipe.

Description

technical field [0001] The present invention relates to steel pipe piles used as foundation piles in the field of civil engineering such as buildings and bridge structures. In particular, it relates to steel pipe piles constructed by percussion, vibratory construction methods or rotary press-in construction methods. [0002] This application claims priority based on Japanese Patent Application No. 2010-008841 for which it applied in Japan on January 19, 2010, and uses the content here. Background technique [0003] For example, construction methods of steel pipe piles used in foundation piles in the field of civil engineering such as buildings and bridge structures include impact and vibration construction methods, rotary press-fit construction methods, and internal excavation (Japanese: 中扬り) construction method etc. In the construction of these steel pipe piles, it is important to reduce ground resistance during construction and to exhibit a large supporting force after c...

AI Technical Summary

Problems solved by technology

[0020] However, in the impact and vibration construction method or the rotary press-in construction method, the ratio of the resistance at the tip of the pile is larger than the resistance at the pile circumference. The reduction of the resistance at the front end is not effective, so there is a possibility that the reduction of the resistance of the foundation cannot be sufficiently achieved

In addition, similarly, when the steel pipe pile described in the above-mentioned Patent Document 3 is used, there is no effect on the reduction of the resistance at the tip of the pile, so there is a possibility that the reduction of the foundation resistance cannot be sufficiently achieved.

[0021] In addition, the construction of steel pipe piles described in Patent Documents 1, 2, and 4 is an invention aimed at a construction method for constructing a root reinforcement after internal excavation, and is a method of transmitting force to the load at the root reinforcement after construction. Increase the construction that exerts its effect but does not exert its effect on the improvement of workability

Furthermore, in the case of using the steel pipe pile described in the above-mentioned Patent Document 5, although the excavation performance at the time of rotary press-fitting is improved, it is a steel pipe pile that does not exert an effect on suppressing the end closure of the steel pipe pile and increasing the supporting force.

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