Device and method for eliminating side friction resistance of test piles

Abstract

The invention discloses a device and method for eliminating side friction resistance of test piles. The device comprises inner sleeves, outer sleeves, anti-turbulence devices and limiting devices, wherein the anti-turbulence devices are arranged at the lower end surfaces of the outer sleeves, the anti-turbulence devices comprise annular rubber plates which extend from the outer sleeves to the interiors of the outer sleeves, the limiting devices are used for being coaxially hoisted inside the outer sleeves, the inner sleeves coaxially penetrate through the limiting devices and then extend out of the annular rubber plates at the lower ends of the outer sleeves, the annular rubber plates are in close contact with the inner sleeves in the circumferential direction, the limiting devices can beused for coaxially positioning the inner sleeves and the outer sleeves, and gaps, located above the top surfaces of the limiting devices, between the outer sleeves and the inner sleeves are sealed bywaterproof sealing layers. The invention further discloses a method for eliminating side friction resistance of the test piles. According to the device and method for eliminating side friction resistance of the test piles, influence of the pile side friction resistance of the test piles in the depth range of foundation pit excavation in a static load test of the test piles can be eliminated, so that the static load test of the test piles can accurately reflect the bearing capacity and the sedimentation amount of engineering piles, and convenient use is achieved.

Description

technical field [0001] The invention relates to the technical field of test pile testing before excavation of building foundation pits, in particular to a device and method for eliminating side friction resistance of test piles. Background technique [0002] With the acceleration of urbanization in my country, the tight urban space resources have promoted the construction of a large number of (super) high-rise buildings and the development of large-volume underground spaces. This trend has led to the deepening of the embedding depth of engineering pile foundations. (Super) high-rise buildings have extremely high requirements on the bearing capacity of pile foundations. How to effectively determine the bearing capacity of single piles through experiments is the key to the design of pile foundations. Generally for this kind of project, the single pile bearing capacity can be determined through the single pile static load test test on the proposed site. In the test, by applying...

AI Technical Summary

Problems solved by technology

The other part of the method adopts the process of hoisting the inner and outer cylinders in succession, but it generally uses the method of wrapping the outer wall of the inner cylinder with waterproof material to stop the water. The waterproof and sealing effects are poor, and the slurry is easy to enter the gap between the double sleeves. Test not reliable

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