Expanded steel pile tip for prefabricated concrete tubular pile and pile sinking construction method

Abstract

The invention discloses an expanded steel pile tip for a prefabricated concrete tubular pile. The expanded steel pile tip comprises an annular end plate, at least two outwards moving supporting leg steel plates, an annular partition plate and an expander, wherein a section of steel tube with closed bottom is connected below the annular end plate; one end of one supporting leg steel plate and one end of the other supporting leg steel plate are movably connected to the left and right sides of the upper end face of the annular end plate through bolts; the annular partition plate is connected to the upper end faces of the supporting leg steel plates through bolts; the at least two outwards moving supporting leg steel plates are movably connected to the two sides of the upper end face of the annular partition plate through bolts; the expander is arranged in the steel tube with closed bottom, and the outside diameter of the bottom of the expander is smaller than those of central through holes of the annular end plate and the annular partition plate; and the expander is connected with a steel cable. Before the expanded steel pile tip is sunken into the prefabricated concrete tubular pile, the steel pile tip is connected with the tubular pile, and the steel cable passes through the gaps among the annular end plate, the annular partition plate and the supporting leg steel plates and the inner hole of the tubular pile and is led to the top of the tubular pile; and after the expanded steel pile tip is sunken into the tubular pile to the required depth, the steel cable is lifted, and the steel cable drives the expander to upwards jack the supporting leg steel plates, so that the supporting leg steel plates are expanded to the outer side of the tubular pile and inserted into the soil layer of the outer side.

Description

technical field [0001] The invention relates to geotechnical engineering, in particular to an expansion steel pile point for prefabricated concrete pipe piles and a pile sinking construction method. Background technique [0002] Prefabricated concrete pipe piles are usually used in soft soil foundations to improve the bearing capacity of the soil layer. As disclosed in Chinese Patent No. CN200610052169.71 "Construction device and construction technology for post-grouting self-introduction hole PHC pipe pile tip anti-rust cap", which relates to a post-grouting self-introduction hole PHC pipe pile tip anti-rust cap construction device , and the hydrostatic pressure pile with flushing water and air guide hole composed of water tank, multi-stage centrifugal pump, high-pressure water pipe, pile clamp, pile feeder, PHC cavity pipe pile, high-pressure gas pipe and air compressor The machine phase is connected; the high-pressure grouting pump is connected with the high-pressure wat...

AI Technical Summary

Problems solved by technology

[0004] However, none of the above techniques can be applied to the construction of precast concrete pile connection nodes.

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