Method for constructing gravel pile of hoop of immersed tube for reinforcing soft foundation

Abstract

The invention discloses a technology for a gravel pile of a hoop of an immersed tube for reinforcing a soft foundation. The technology can effectively limit the pile block to be expanded to deform laterally, therefore, the bearing capacity of the pile body is further improved and the pile top settlement is further reduced. The technology comprises the steps of: 1, installing a pile tube on a vibrating immersed tube gravel pile machine, and vibrating the immersed tube in a predetermined position , and stop vibrating till the gravel pile reaches a predetermined standard height; 2, pouring grovels from a gravel inlet, vibrating and pulling the tube, and continuously supplementing gravels and controlling the amount of gravels in the tube pulling process so that the top surfaces of gravels are 2-3m far from the predetermined standard height of the gravel pile; opening a slot door when the pile tube is pulled to the bottom of a slot opening and in the predetermined standard height of the gravel pile, measuring whether the distance from the top surfaces of the gravels to the bottom end of slot opening is 2.0m or not; 3, placing a prepared geogrid cylinder from the side slot opening of the immersed tube and pouring the gravels, wherein the amount of the gravels poured ensures that the predetermined standard height of the gravel pile after completion of tube-pulling reaches the predetermined standard height; and 4, continuously vibrating and pulling the tube till the end.

Description

technical field [0001] The invention relates to a construction method of a tendon-stitched gravel pile, in particular to a technique for sinking a tendon-stitched gravel pile for strengthening weak foundations. Background technique [0002] When the natural foundation cannot meet the requirements of the building for the foundation, the foundation needs to be treated to form an artificial foundation to ensure the safety and normal use of the building. Vertical reinforcement composite foundation is a commonly used technical measure for foundation reinforcement. At present, the vertical reinforcements used in engineering include gravel piles, sand piles, cement soil piles, lime piles, various low-strength piles and reinforced concrete piles, etc. . Among them, the composite foundation of crushed stone piles can fully exert its replacement effect and increase the shear strength of the foundation; at the same time, the crushed stone pile body has good water permeability, and can...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a construction method for the hooped gravel pile. The construction method can add a geogrid sleeve during the construction of ordinary gravel piles by vibrating and sinking pipes, and finally form the hoops. Gravel pile, this construction method will not deform or collapse the formed pile hole due to the pull out of the sinking tube, and the formed hooped stone pile has high reliability

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