Load box having automatic internal state induction function and used for pile foundation self-balance tests

Abstract

The invention relates to a detection device for measuring the bearing capacity of foundation piles in building foundation pile construction, in particular to a load box having an automatic internal state induction function and used for pile foundation self-balance tests. The load box comprises a load box face plate and a hydraulic jack and further comprises a displacement sensor and an oil pressure sensor. The displacement sensor, the oil pressure sensor and the load box are arranged into a whole. The displacement sensor and the oil pressure sensor are connected with a static load instrument, arranged on the ground surface, through wires correspondingly. According to the load box, a displacement rod is directly connected with the bottom of an oil cylinder, the installation process is simplified, the accuracy of displacement detection is improved, and cost is saved. The displacement sensor and the oil pressure sensor are arranged in the load box, and the true working state of the load box which has been buried underground can be monitored in real time; and the oil pressure value in the load box can be accurately measured.

Description

technical field [0001] The invention relates to a detection device for measuring the bearing capacity of foundation piles in the construction of building foundation piles, in particular to a load box for self-balancing tests of pile foundations with the function of automatic induction of internal states. Background technique [0002] Construction projects, especially the construction of high-rise buildings and large structures, require the use of a large number of pile foundations. According to the requirements of the national code for quality acceptance of foundation and pile foundation projects, static load testing of the bearing capacity of test piles and engineering piles should be carried out to determine and test the bearing capacity of single piles, which is a mandatory clause for the quality acceptance requirements of foundation piles. The reaction device of the traditional initial static load test ballast platform is to use sand bags and concrete prefabricated blo...

AI Technical Summary

Problems solved by technology

After the test, there is no way to know what is going on inside the load cell

[0004] However, in actual use, the displacement rod is damaged due to improper construction or protection, which leads to frequent test failures.

And the displacement rod is long, the installation and maintenance are difficult, so the survival rate of the load box buried in actual use is not high

During the installation process, it is necessary to ensure the sealing of the displacement protection pipe, and no cement slurry can penetrate, otherwise it will affect the test accuracy of the displacement of the foundation pile and even fail to measure the displacement

During the test, the oil pressure gauge is on the surface, and the oil pressure inside the load box cannot be detected

The real working status of the buried load box cannot be monitored effectively in real time afterwards. When the test data is quite different from the pre-prediction, it is often easy to misjudge whether there is a problem with the measurement system or the quality of the test pile.

Images