Device and method for testing pile bottom grouting through reserved pipe bottom shock excitation by-pass port receiving wave velocity test

Abstract

The invention discloses a device and a method for testing pile bottom grouting through a reserved pipe bottom shock excitation by-pass port receiving wave velocity test. The device comprises a reserved duct in a cast-in-situ pile, a by-pass pore nearby a pile body, a shock excitation hammer and receiving signal sensors. During pile forming, the reserved duct is formed in the cast-in-situ pile; after pile forming, drilling is carried out in a place far from a pile at a certain distance, and a string of sound wave receiving sensors are embedded; before and after the pile bottom grouting, shock excitation is carried out on a pile bottom soil body in the reserved duct through a heavy block, and shock excitation signals are received through the sound wave receiving sensors; shear wave velocities of the soil body before and after grouting can be calculated through the signal receiving time and the distance between an shock excitation point and a receiving point, and the effect of the pile bottom grouting can be analyzed; after the test is ended, the shock excitation hammer and the sensors can be recycled for repeated use.

Description

technical field [0001] The invention belongs to the field of pile bottom grouting, and in particular relates to a pile bottom grouting test device and method for receiving wave velocity tests at a side hole reserved for exciting vibration at the bottom of a pipe. Background technique [0002] Pile Bottom Grouting means that after drilling, punching and hole-digging cast-in-situ piles are formed into piles, the grout that can be cured (commonly used cement slurry) is passed through the grouting channel of the pile body with a certain pressure by a grouting pump (can be embedded in the pipeline) , can also be post hole) into the bottom of the pile. After the grout is solidified, it can improve the stress state and load transfer performance of the bearing layer of the pile foundation, greatly increase the frictional resistance of the pile side, repair the defects of the pile body, etc., thereby improving the bearing capacity of the pile foundation or reinforcing the accident pi...

AI Technical Summary

Problems solved by technology

[0009] The existing method to detect the effect of pile bottom grouting is only the static load test. However, the cost of the existing static load test is too high, and the test platform must be rebuilt for each test, which consumes a lot of manpower and material resources, and can only be measured The bearing capacity of the pile foundation cannot be accurately known for the action mechanism and action range of the grouting

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