Prefabricated hollow pile sinking method

Abstract

The invention discloses a pile sinking method for a hollow preformed pile. The method is as follows: a pile point is arranged on the end part of the hollow preformed pile at first and then the hollow preformed pile is placed on a pile driver; after the pile drive is in place, the pipe is rapidly pressed and passes through a miscellaneous fill layer; when the pile is pressed continuously, soil is taken out from the inside of the pile point; soil obtaining is stopped when the height is 0.5 to 1.0 meter away from the designed scale height; and finally the pile is pressed continuously until the designed scale height is reached. By adoption of the method to arrange the pile point on the end part of a static pressure preformed pile, the pile point has three functions of soil cutting, as a mixer and as a soil extruding controller. The soil is taken away through a hollow body of the pile by using high-pressure water or slurry to convert the soil into the slurry in the pile point (the mixer). By conversion of a common soil extruding preformed pile into a 'soil extruding-non-soil extruding' controllable pile, the method greatly reduces the resistance for pressing the pile, widens the application scope, has stable quality, and is pollution-free. Moreover, the method can save the investment and reduce engineering accidents under certain geological conditions.

Description

technical field [0001] The invention belongs to a pile construction method, in particular to a pile sinking method of a prefabricated hollow pile. Background technique [0002] In the construction of building pile foundations, static pressure prefabricated hollow piles are widely used. Its advantages are low cost, fast construction speed and no pollution. The shortcoming has two points: one, encounter dense sand layer or hard soil layer and can't go down, or call pile sinking difficulty, cause bearing capacity to drop, or can't use. 2. Excessive squeezing of the soil causes broken piles or excessive settlement of piles. For this reason, measures such as pilot hole static pressure pile and water flushing (air lift) pile sinking method have been adopted. These measures are effective to a certain extent, but the degree of soil disturbance around the pile is not easy to control or cannot be controlled at all. The discreteness of the pile side resistance is large, which has a ...

AI Technical Summary

Problems solved by technology

There are two disadvantages: 1. The dense sand layer or hard soil layer cannot be pressed down, or it is difficult to sink the pile, resulting in a decrease in bearing capacity, or it cannot be used

2. Excessive soil compaction causes broken piles or excessive settlement of piles

For this reason, measures such as pilot hole static pressure pile and water flushing (air lift) pile sinking method have been adopted. These measures are effective to a certain extent, but the degree of soil disturbance around the pile is not easy to control or cannot be controlled at all. The discreteness of the side resistance of the pile is large, which has a great influence on the construction and bearing capacity

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