An uplift-resistant pile-raft foundation structure with controllable stiffness and its construction method

Abstract

The invention discloses an anti-uplift type controllable stiffness pile raft foundation structure and a construction method, wherein the uplift type controllable stiffness pile raft foundation structure includes a pile body, a raft plate, a base, a side guard plate, a cylinder body and a stiffness adjustment device; the cylinder body is sleeved on the base at the top of the pile body, and the inner wall of the cylinder body is fixedly connected with the outer wall of the side guard plate and the pile body; the cylinder body is a circular structure with a closed upper part and an open lower part; the cylinder body There are several sleeves and grouting holes on the top; the lower part of the sleeve is fixedly connected with the longitudinal reinforcement in the pile body, and the upper part of the sleeve is connected with the inner reinforcement of the raft; the grouting hole on the top of the cylinder is connected with the raft The grouting channel on the top is connected. The invention effectively utilizes the sleeve to respectively connect the longitudinal reinforcement of the pile body and the internal reinforcement of the raft slab, and greatly improves the pullout resistance performance of the joint of the pile-raft foundation with controllable stiffness. The method of connecting the flexible side guard plate, the rigid integrated cylinder body and the base by using the cementing material improves the anti-seepage ability of the top structure of the pile body of the controllable stiffness pile raft foundation.

Description

technical field [0001] The invention belongs to the technical field of foundations, and relates to an uplift-resistant pile-raft foundation structure with controllable stiffness and a construction method, which are used for engineering practice of pile-raft foundations with controllable stiffness. Background technique [0002] Controllable stiffness piled raft foundation is a new type of piled raft foundation with a special stiffness adjustment device on the top of the pile body, which can effectively intervene and adjust the supporting stiffness of the pile foundation. By optimizing the deformation coordination between piles and piles and piles and soil, the controllable stiffness pile raft foundation can effectively solve the pile-soil interaction of large-supported stiffness piles such as end-bearing piles, especially rock-socketed piles, and the variable stiffness of large-chassis buildings or building groups. Leveling, complex geological conditions such as boulders, kar...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the first point is that the foundation structure of piled rafts with controllable stiffness needs to be further optimized

[0004] The second disadvantage is that the pullout performance of the controlled stiffness piled raft foundation needs to be further optimized

The reason why the previous controllable stiffness pile raft foundation structure did not set uplift reinforcement is that if longitudinal pullout reinforcement is installed in the top structure of the controllable stiffness pile raft foundation, when the upper load gradually increases, the stiffness adjustment device will gradually produce compression deformation, As a result, the connected longitudinal steel bars are compressed and deformed, and then lose the pullout performance, resulting in the limited pullout performance of the joints of the existing controllable stiffness pile-raft foundation, which is not conducive to the further development of the controllable stiffness pile-raft foundation in super high-rise buildings. Promote application

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