Construction method of uplift pile

Abstract

The invention provides a construction method of an uplift pile. The construction method comprises the following steps: 1) a protection cylinder is sunk to a set depth; 2) the protection cylinder is filled with a cement mixture and the cement mixture is hammered to form a bottom layer of a carrier; 3) a special anchoring piece consisting of a vertical anchoring rod and a bottom anchoring disc is sunk in the protection cylinder; 4) a piercing hammer is sunk in the protection cylinder with the vertical anchoring rod as a middle core; 5) the protection cylinder is filled with the cement mixture; 6) the piercing hammer is hoisted to ram the filled cement mixture; 7) the operations in the steps 5) and 6) are repeated to gradually form the carrier at a pile end; and the bottom anchoring disc is wrapped and embedded in the carrier; and 8) after cement mortar or plain concrete is poured, a pull resisting anchor rod pile is formed; or after a reinforcement cage in sunk into the protection cylinder and concrete is poured, a pull and pressure-resisting reinforced concrete pile is formed.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a construction method of an uplift pile. Background technique [0002] With 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. In the patent document No. 98124854.3, a construction method for concrete anchor piles is provided, through a reinforcement cage with an expandable diameter portion, and the expandable diameter portion of the reinforcement cage is expanded by filling tamping, An enlarged head is formed at the end of the pile. However, in the actual implementation, it was found that the main problems of this method are that the first is that the weight of the hammer used is of great energy, and the bottom of the hammer often directly hi...

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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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