Back-anchored uplift pile with flexible pile top

Abstract

The invention relates to a back-anchored uplift pile with a flexible pile top. The uplift pile comprises a concrete pile body (3), a foundation beam slab (4), a compressible flexible connection cushion layer (2), a non-cohesive steel strand (1), a pile-top anchor (5), a pile-bottom anchor (6), and a sleeve (7), wherein the space between the top of the concrete pile body (3) and the foundation beam slab (4) is filled with the compressible flexible connection cushion layer(2); the lower part of the non-cohesive steel strand (1) is anchored on the bottom of the concrete pile body (3); the non-cohesive steel strand (1) penetrates the concrete pile body (3) and the flexible connection cushion layer (2) to the pile top, penetrates out of the upper end of the foundation beam slab (4) through the sleeve (7), and is anchored on the upper end of the foundation beam slab (4) by the pile-top anchor (5); and the upper end of the non-cohesive steel strand (1) is not tensioned and anchored during construction of the underground structure until the foundation soil is compressed and settled stably before water returning to a foundation pit, so that a friction pre-stress is generated between the concrete pile body (3) and soil around pile (9). Therefore, the uplift displacement of an underground construction can be reduced by anchoring the pile top after the foundation settles and by generating the friction pre-stress between the concrete pile body (3) and soil around pile (9), thereby effectively controlling vertical deformation of the underground construction.

Description

technical field [0001] The invention relates to a post-anchored flexible pile top uplift (floating) pile, which belongs to the technical field of underground engineering. Background technique [0002] With the development of urban construction and the continuous improvement of residents' living standards, the utilization of underground space (basement, underground garage, underground shopping malls, etc.) has become a trend. In recent years, due to the large-scale development of underground space, there are more and more buildings with basements and simple underground parking lots. There are more and more situations where objects bear floating loads, and the loads are getting bigger and bigger. [1] . [0003] The top of the traditional uplift (floating) pile is rigidly connected to the foundation floor. During the construction period, the pile is in a state of compression, which will produce a jacking resistance to the foundation floor, which restricts the flexible arrange...

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Problems solved by technology

In addition, the price of fiber reinforcement is very high, and it is less economical than steel strands

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