Construction method of anti-pull carrier pile

Abstract

The invention provides a construction method of an anti-pull carrier pile. The construction method comprises the steps of (1) sinking a pile casing to a set depth; (2) filling a cement and sand mixture into the pile casing, and tampering the filled cement and sand mixture through a hammer; (3) repeating filling and tampering operation in the step (2), and reinforcing and compacting a soil body a certain depth below the pile tip within a certain range; (4) controlling the reinforcement and compactness degree with the three-tampering penetration degree or the filling amount as the standards andforming a carrier at the pile end; (5) continuously hammering the carrier through the hammer to form a tampering hole, or continuously hammering the carrier through the hammer to form the tampering hole and then pressing down the pile casing to follow up; (6) stopping hammering when the tampering hole in the carrier reaches up to a certain depth; (7) sinking a reinforcement cage or an anchor cablein the pile casing to enable the bottom end of the reinforcement cage or the anchor cable to go into the tampering hole of the carrier; and (8) filling concrete or cement mortar into the pile casing,and then pulling out the pile casing to form the pile.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a construction method of an uplift-resistant carrier pile. Background technique [0002] With the continuous increase in the number of buildings and the continuous improvement of the level of construction technology, the requirements for pile foundations of buildings have also been strengthened accordingly. In many cases, pile foundations not only need to resist pressure, but also need to provide a certain amount of pullout resistance. For example, in construction sites with high groundwater levels, areas with strong wind pressure, or areas with high seismic requirements, it is necessary to take corresponding anti-floating and anti-lifting measures for underground structures to ensure the safety and normality of buildings (structures). use. At present, the most commonly used anti-uplift pile structure or anti-floating anchor mainly relies on the friction between the uplift pile ...

AI Technical Summary

Problems solved by technology

However, in the actual implementation, it was found that the main problems of this method are that the first is because the hammer used has a large energy, and the bottom of the hammer often directly hits the steel bar of the diameter-expandable part, which is easy to cause the steel bar to be sheared and broken, thereby The pullout resistance is lost; the second is that although the inner layer of the steel bar in the expandable part is filled with dense packing, the outer layer of the steel bar only has the original soil layer, so the steel bar in the expandable part is not fully wrapped by the filler; Third, the pull-out force is provided entirely by the friction force between the steel bar at the expandable diameter and the enlarged head, so the pull-out force provided by this method is insufficient and unstable

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