Construction method for expansion head anti-pressing and anti-pulling pile

Abstract

The invention discloses a construction method for an expansion head anti-pressing and anti-pulling pile. The construction method comprises the steps that firstly, an anchor pulling device and a tamping device are prefabricated; secondly, pipe sinking is conducted, a steel pipe and a head sealing plate are sunk underground through a piling device; thirdly, the anchor pulling device, a grouting pipe and the tamping device are sunk into the steel pipe, and an anchor cable and the grouting pipe penetrate a hole, then the steel pipe is filled with backfill, the backfill is tamped and smashed through the tamping device, and an expansion head is formed through the backfill overflowing out of a lower port of the steel pipe; fourthly, a pile hole is filled with backfill, the backfill is smashed densely through the tamping device, and manufacturing of a whole pile body is finished; fifthly, the expansion head and a backfill pile are grouted through the grouting pipe, and the grouting pipe is uplifted while grouting is conducted; and sixthly, the steel pipe is pulled out after grouting is finished. By means of the arrangement of the expansion head, the size of the lower end of the pile body is increased, the anti-pressing and anti-pulling effects of a pile foundation are improved, only the anchor pulling device needs to be extruded to the position below the pile hole along with the backfill, operation is easy, and cost is low.

Description

technical field [0001] The invention belongs to the field of building pile foundations, and in particular relates to a construction method of an enlarged-head compression and uplift pile. [0002] Background technique: [0003] With the rapid development of urban construction, the land resources available for construction are becoming less and less, so housing construction is developing towards high-rise buildings, and various high-rise and super high-rise buildings have become the current construction dominance. For the foundation engineering of high-rise and super high-rise buildings, the requirements for foundation bearing capacity are getting higher and higher. In some structures in the project, the pile foundation not only bears the vertical pressure from the superstructure, but also bears the buoyancy brought by the groundwater, that is, the pile foundation not only needs to resist pressure, but also needs a certain pullout resistance. Therefore, it is necessary to so...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a construction method of enlarged head compression and uplift piles, which solves the cumbersome steps, low efficiency and high cost of cement-soil piles in the prior art technical issues

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