Underwater soil body expansion stirring device and underwater bottom expansion pile construction method

Abstract

The invention relates to an underwater soil body expansion stirring device. The underwater soil body expansion stirring device is fixedly arranged at the lower end of a drill pipe, the drill pipe is adouble-pipe drill pipe with a core pipe, the underwater soil body expansion stirring device comprises an outer tube, an inner tube, a cutting stirring frame, a drill bit and a slurry conveying system, the upper end of the outer tube is fixedly connected to the drill pipe, the inner tube slides up and down to be sleeved with the lower portion in the outer tube, the cutting stirring frame is arranged between the outer tube and the inner tube in a circumferential array manner, and the drill bit is fixedly arranged at the lower end of the inner tube. An underwater bottom expansion pile construction method includes the following steps of determining the expansion stirring range, determining the size of the underwater soil body expansion stirring device, selecting the drill pipe, preparing slurry, drilling a straight hole, conducting expansion stirring, taking soil and conducting pouring of bottom expansion piles. The purpose is to solve the problem that a surrounding non-cohesive soil layer cannot be self-stabilized and is prone to collapsing when the bottom is expanded underwater, and the underwater soil body expansion stirring device and the underwater bottom expansion pile construction method are provided.

Description

technical field [0001] The invention relates to the technical field of underwater foundation construction, in particular to a construction method of an underwater soil expansion agitator and an underwater bottom expansion pile. Background technique [0002] The expanded bottom pile is a kind of end-bearing pile with high bearing capacity, which is very popular in building pile foundations. The enlarged head part of the expanded bottom pile is usually located in the non-cohesive soil layer such as sandy soil, sandy gravel, pebble gravel, etc. However, when the hole is reamed in these non-cohesive soils underwater, the space after reaming is very easy to collapse, and it is usually difficult to expand into a frustum-like large head space. If the groundwater above the elevation of the expansion head is drained first, and then the construction of the reaming pile is performed, the construction cost of the reaming pile will undoubtedly be greatly increased. Here it is the main ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the surrounding non-cohesive soil layer cannot self-stabilize and collapse easily

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