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

An automatic sensing and internal state technology, applied in the test of foundation structure, foundation structure engineering, construction, etc., can solve the problems of easy misjudgment of test pile quality in the measurement system, test failure, damage of displacement rod, etc., and achieve simple and effective high-pressure sealing , Simplify the installation process and improve the accuracy

Pending Publication Date: 2017-08-18
NANCHANG YONGQI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one: if Figure 1-5 shown.

[0032] The load box of the present embodiment is a combined load box, and the combined load box includes a base plate 9, a panel 10, several series-connected oil cylinders 1 arranged between the base plate 9 and the panel 10, the displacement sensor 3 and the oil pressure The sensors 4 are all arranged inside the piston of the oil cylinder 1 .

[0033] In this embodiment, the end of the displacement rod 5 of the displacement sensor 3 passes through the piston 2 and is inserted into the bottom of the oil cylinder 1 fixedly without penetrating, and the oil pressure sensor 4 is connected to the bottom of the piston 2 through threads. The displacement rod 5 of the displacement sensor 3 is screwed to the bottom of the oil cylinder 1 .

[0034] The outer cover of the displacement rod 5 is equipped with an O-ring 61, and a Y-ring 62 embedded in the piston 2 is also provided. The Y-ring 62 is provided with a sealing ring baffle 7, and t...

Embodiment 2

[0039] Embodiment two: see attached Figure 6 .

[0040] The load box of this embodiment is still a combined load box, and the similarities with Embodiment 1 will not be repeated. The difference is that in this embodiment, the end of the displacement rod 5 of the displacement sensor 4 passes through the piston and directly Going through the bottom of the oil cylinder, the displacement rod 5 is threadedly connected to the bottom of the oil cylinder and is provided with a threaded plug outside. The displacement rod 5 is covered with an O-shaped sealing ring 61 and a Y-shaped sealing ring 62 .

Embodiment 3

[0041] Embodiment three: see attached Figure 7 .

[0042] The load box of this embodiment is still a combined load box, and the similarities with Embodiment 1 will not be described in detail. The difference is that the displacement sensor is installed externally, and is arranged on the jack cylinder between the bottom plate 9 and the panel 10. Externally, the oil pressure sensor is installed at the oil outlet of the jack, and then sealed and protected with a sealing plate.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00
Inventor 左志群胡舵郑宏昌
Owner NANCHANG YONGQI TECH DEV
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