A kind of anti-pull prestressed anchored gravel pile with bottom expansion-multi-stage side expansion and its construction method

Abstract

The invention discloses a bottom expanding-multisection side expanding anti-pull prestressed anchoring gravel pile and a construction method and belongs to the technical field of foundation base structures. The gravel pile comprises a side expanding gravel pile body provided with multiple side expanding sections and at least one prestressed anchor cable / rod; an anchor disc is arranged at the top of the side expanding gravel pile body, and a bottom expanding base provided with an expanded bottom is arranged at the bottom of the side expanding gravel pile body. The construction method comprises the steps that a gravel pile hole is dug, and bottom expanding and side expanding are conducted; a hardcore bed is constructed; a reinforced concrete bottom expanding base is constructed, and the anchor cable / rod is fixed in the reinforced concrete bottom expanding base; the side expanding gravel pile body is constructed; the anchor disc at the top of the pile and an anchor plate are constructed, and anchor cable / rod prestressing force is exerted. According to the bottom expanding-multisection side expanding anti-pull prestressed anchoring gravel pile and the construction method, gravel is tightly pressed in a gravel hole through the anchor cable / rod so as to form the gravel pile body, so that the bottom expanding base, the gravel pile body and the anchor disc are made into a force-bearing whole, and thus the anti-pull capacity is effectively improved; in addition, the anti-shearing and anti-slip resistance between a pile body and a soil body is increased through the side expanding gravel pile body and the bottom expanding base, the stratum applicability of a structure is improved, and the influence of underground water is reduced.

Description

technical field [0001] The invention belongs to the technical field of foundation structures, and in particular relates to a bottom-expanding-multi-section side-expanding uplift-resistant prestressed anchored gravel pile and a construction method. Background technique [0002] A large number of projects bear uplift or buoyancy resistance, which makes the application of uplift piles very extensive, such as: urban foundation projects such as underground garages, underground pipe galleries and sunken squares; coastal / river wharf projects and pile foundations for large dock floors, suspension bridges, Cable-stayed bridge anchor pile foundation, anchor pile reaction foundation and other structures. At present, cast-in-place reinforced concrete uplift piles (including bottom uplift piles) and anchor piles or beams are often used in the design of uplift structures. Reinforced concrete uplift piles have certain uplift resistance and high compressive and bearing capacity, but the fr...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a bottom expansion-multi-stage side expansion pull-resistant prestressed anchored gravel pile and construction method to solve the problem of poor pull-out resistance, high stratum requirements, and high engineering cost in the prior art. The problem

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