Construction method for pre-drilling hole-forming base-expanding and grouting of prestressed concrete special-shaped pile

Abstract

The invention discloses a construction method for pre-drilling hole-forming base-expanding and grouting of a prestressed concrete special-shaped pile. The method includes the steps that step one, a single-axis drilling machine is adopted for hole drilling according to a set depth; step two, hole reaming is carried out on the end portion of the pile according to a set diameter and a set height; step three, pile end cement paste and pile periphery cement paste are grouted, and the drilling machine is lifted while grouting is carried out; step four, by means of self weight of the prestressed special-shaped concrete pile, the pile is planted into a designed elevation; step five, through hardening of pile end cement paste and pile periphery cement paste, the pile, the soil mass at the pile end and the soil mass on the periphery of the pile are integrated to manufacture a pile foundation which is borne by a precast pile body, the pile end cement paste and the pile end soil mass. The method has the advantages of being free of soil squeezing, noise and air pollution, and horizontal bearing capacity of the pile body is improved substantially; kinds of interlayers can be penetrated, and the method is adapted to the geological condition that a bearing course at pile end is large in variation; the elevation at the pile top is controllable without the need for pile cutting. The phenomenon that a pile head is damaged or compressive pre-stress of the pile body changes due to the pile cutting can be avoided, the pile body is reliable in long-term durability and more reliable in integrity.

Description

technical field [0001] The invention relates to a construction method, more specifically, it relates to a construction method of pre-drilling and bottom-expanding grouting for pre-stressed concrete special-shaped piles. Background technique [0002] In recent years, with the development of urbanization, the land for urban construction has become more and more tense, and the rapid development of high-rise and super high-rise buildings requires very high bearing capacity of the foundation. The use of prestressed concrete pipe pile foundation has low cost and fast construction period. Often in urban areas, due to the high requirements of the surrounding environment, bored piles have the advantages of good construction bearing capacity and no effect of squeezing the surrounding soil, but are limited due to large mud discharge and difficult control of pile quality. . Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the ...

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Problems solved by technology

[0002] In recent years, with the development of urbanization, the land for urban construction has become more and more tense, and the rapid development of high-rise and super high-rise buildings requires very high bearing capacity of the foundation. The use of prestressed concrete pipe pile foundation has low cost

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