Post-tensioned pile foundation and construction technology of cone head tendon

Abstract

The invention discloses a conical-head tendon body post-tensioning pile foundation and a construction process thereof. The conical-head tendon body post-tensioning pile foundation comprises a pile body, wherein the center of the pile body is provided with a tendon body; the outer side of the tendon body is sleeved by an spacer sleeve; the top end of the tendon body penetrates through the pile body and is locked by an anchor; the bottom end of the tendon body is provided with a conical-head anchorage body with thicker middle and thinner periphery. By virtue of arranging the conical-head anchorage body on the tendon body, during a process of inserting the tendon body into concrete grout, compared with a traditional flat anchorage body, the conical-head anchorage body is capable of reducing the friction between the concrete grout and the anchorage body, namely reducing the descending resistance of the tendon body, solving the problems of tendon body inclination and bending and low insert efficiency caused by overhigh resistance during a construction process of inserting the tendon body after concrete grouting of long auger holes, and improving the descending working efficiency and working quality of the tendon body; by virtue of threaded connection of the anchorage body and the tendon body, the replaceability of the tendon body is realized, and maintenance on the conical-head tendon body post-tensioning pile foundation during the late stage is solved.

Description

technical field [0001] The invention relates to the field of anti-lifting and anti-floating foundations, in particular to a post-tensioned pile foundation with conical head tendons and a construction process. Background technique [0002] With the development and utilization of underground space, the problem of anti-floating of buildings has become increasingly prominent, and the uplift load of building foundations is increasing. In areas with high groundwater levels, when some underground buildings are lower than the surrounding soil water level, the underground buildings Both structures and structures have structural anti-floating problems. In order to offset the buoyancy effect of water in the soil on the building structure, anti-floating measures are usually required. The existing anti-floating measures often use anti-lift piles or anti-floating anchors to constrain The buoyancy of the groundwater to the building plays a role in preventing the building from being pulled ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a post-tensioned pile foundation with conical head tendons and construction technology. One end of the prestressed tendons adopts a conical head structure, which effectively reduces the friction between the tendons and the concrete slurry, thereby reducing the The lowering resistance of the ribs improves the construction efficiency and solves the situation that the ribs are not lowered in place or bent and broken

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