A Pile Top Rigidity Adjusting Device Based on Variable Strength Supporting Materials

Abstract

The invention discloses a pile top stiffness adjustment device based on a variable-strength supporting material, which comprises: a cover plate and a cylinder body, the cylinder body is in the structural form of an upper part opening and a lower part sealing, and a variable-strength metal supporting material is arranged in the cylinder body; The cover plate is arranged on the cylinder body and is in contact with the upper end of the variable-strength metal support material; the rigidity of the variable-strength metal support material is greater than that of the side wall of the cylinder body. The invention effectively utilizes the appearance parameters of the variable-strength metal support material to change its own compression performance, and overcomes the fact that the volume of the support material itself cannot be changed in the existing pile top stiffness adjustment device, and the vertical compression can only be caused by the crushing or discharge of the support material. Disadvantages of displacement, high adjustment accuracy, stable operation, simple preparation process, low manufacturing cost, convenient installation, the load-displacement curve of the stiffness adjustment device under the action of the upper load has a significant linear change characteristic, without any fluctuation phenomenon, there is It is beneficial to further promote the engineering practice of pile-raft foundation with controllable stiffness.

Description

technical field [0001] The invention belongs to the technical field of foundation foundation, and relates to a pile top stiffness adjusting device. Background technique [0002] As an important foundation of high-rise buildings, pile-raft foundation has been widely used in practical engineering, but there are still some engineering problems, such as: pile-soil interaction of large supporting stiffness piles, variable stiffness leveling design of large chassis high-rise buildings , the recycling of waste pile foundations, the construction of high-rise buildings with complex geological conditions, etc., when encountering a combination of two or more of the above conditions, conventional pile-raft foundations usually cannot be solved or need to pay a large price. [0003] In order to solve the above problems, Zhou Feng's research group of Nanjing University of Technology has successively developed the first-generation pile end displacement adjusting device (ZL200510040316.4) an...

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Problems solved by technology

[0004] However, in the existing pile top stiffness adjustment device, the volume of the internal supporting material itself does not change, and the vertical displacement of the stiffness adjustment device mainly comes from the crushing or discharge of the material, resulting in load-displacement changes in the existing stiffness adjustment device A series of problems such as easy fluctuation of the curve, unstable operation, low adjustment accuracy, complex preparation process, high manufacturing cost, and easy corrosion of supporting components in the groundwater environment limit the theoretical research and engineering of piled raft foundations with controllable stiffness to a certain extent. application

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