Pile pulling equipment and quick pile pulling method under low clearance height

Abstract

The invention discloses pile pulling equipment under the low headroom and a quick pile pulling method. The pile pulling equipment comprises a base, wherein a jack is arranged on the base, a top plateis connected with the top end of the jack, a steel wire is connected with the top plate and connected with a hoop holding the top end of a pile through a pulley block, and the jack jacks the top plateto produce pulling force for the pile. The pile pulling equipment and the quick pile pulling method have the advantages as follows: vertical force of the jack is converted into pulling force in the pile axis by controlling the position of pulleys, so that pulling of oblique pile bodies can be realized, pile breakage can be prevented, and the condition of non-uniform diameter of pile bodies alongthe pile lengths can be self-adapted; by means of the quick pile pulling method adopting grouting and antifriction for different pile shapes under the low headroom condition in channels, the pulling operation efficiency of barrier piles in the tunnel crossing range is greatly improved.

Description

technical field [0001] The invention relates to a pile pulling device, in particular to a pile pulling device and a quick pile pulling method under a low clearance height. Background technique [0002] In construction projects, especially in underground projects, the construction of subsequent buildings is often not considered by the structures constructed first, which affects the subsequent construction, especially the bored piles that remove existing structures are very common in tunnel construction. During the construction of subways and municipal tunnels, shield machines often need to pass through the pile foundation groups under existing buildings or bridges. These obstacle piles increase the construction difficulty of shield tunneling, so the tunnel must pass through the piles within the range clear. This kind of obstacle removal construction often needs to be carried out under the conditions of low headroom, such as in urban underground passages, short construction p...

AI Technical Summary

Problems solved by technology

This kind of obstacle removal construction often needs to be carried out under the conditions of low headroom, such as in urban underground passages, short construction period requirements, and high environmental protection requirements. When carrying out casing construction, flushing water cannot ensure that the soil around the pile is squeezed to the pile body again to realize the separation of the pile and soil, while the traditional pile extraction process has limitations. It is also necessary to carry out the sinking and re-extraction of the steel casing, which increases the construction process and construction difficulty; the separation of the soil by high-pressure flushing cannot completely solve the stress release of the soil in the lower part of the pile hole during the pile extraction process, which causes the foundation soil to grow from bottom to top. Lateral extrusion of the pile body increases frictional resistance and the soil on the upper part of the inclined pile squeezes the upper part of the pile body under the action of its own weight to increase the side wall resistance

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