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Cylindrical hoop strain earth pressure sensor and measurement method

An earth pressure sensor and cylindrical technology, which is applied in the field of cylindrical body hoop strain earth pressure sensor and measurement, can solve the problems such as the inability to apply pressure observation of multi-level measured objects, achieve low cost, improve measurement accuracy, and eliminate errors. Effect

Active Publication Date: 2017-07-07
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The earth pressure cell is only used when the calibration environment is similar to the use conditions, and it cannot be applied to the pressure observation of multi-level measured objects.

Method used

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  • Cylindrical hoop strain earth pressure sensor and measurement method
  • Cylindrical hoop strain earth pressure sensor and measurement method
  • Cylindrical hoop strain earth pressure sensor and measurement method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] see figure 1 , figure 2 with Figure 10 , The invention discloses a cylindrical body hoop strain earth pressure sensor, comprising a cylindrical elastic sensing body 1, a resistance strain gauge 2, a strain gauge lead wire 3 and a casing.

[0041] The cylindrical elastic induction body 1 adopts a cylindrical elastic body, and the cylindrical elastic induction body 1 is provided with a structure to increase the compressive modulus, and the structure is integrally formed with the cylindrical elastic induction body 1 . Specifically, elastic materials such as rubber and plastic can be used for the cylindrical elastic induction body 1 .

[0042] The columnar elastic induction body 1 adds a structure to improve the compressive modulus, and the specific structure of the structure is:

[0043] (1) Using inner ribs, the inner ribs are arranged inside the cylindrical elastic induction body, and the compressive modulus of the cylindrical elastic induction body is changed by ch...

Embodiment 2

[0053] The structure and composition of the earth pressure sensor of embodiment 2 are basically the same as the structure and composition of the earth pressure sensor of embodiment 1, and the distinguishing features are:

[0054] The shell adopts a soft shell4. see image 3 , the soft shell 4 is wrapped around the periphery of the cylindrical elastic sensing body 1, and is closely attached to the outer surface of the cylindrical elastic sensing body 1, and the elastic modulus of the soft shell 4 is much smaller than the elastic modulus of the elastic base material of the cylindrical elastic sensing body When under pressure, the deformation of the soft shell is consistent with the deformation of the cylindrical elastic sensing body, and does not affect the deformation of the cylindrical elastic sensing body 1 and the resistance strain gauge 2.

Embodiment 3

[0056] The structure and composition of the earth pressure sensor of embodiment 3 are basically the same as the structure and composition of the earth pressure sensor of embodiment 1, and the distinguishing features are:

[0057] The case is hard shell. see Figure 4 with Figure 5 , the hard shell adopts a hollow cylindrical cylinder, and a protective cavity 7 is formed between the side shell of the hard shell and the side wall of the cylindrical elastic induction body 1, which is used to prevent the cylindrical elastic induction body and the resistance strain gauge from being affected by the lateral direction. Constraints to improve observation accuracy. The upper and lower ends of the protective cavity are filled with flexible material 10 to prevent unnecessary material intrusion.

[0058] The hard shell adopts a retractable structure, and the specific structure of the hard shell is:

[0059] Including the shell convex part 5 and the shell concave part 6, the shell conc...

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Abstract

The present invention relates to the field of earth pressure detection, in particular to a cylindrical body circumferential strain earth pressure sensor and a measurement method, the earth pressure sensor includes a cylindrical elastic induction body, a resistance strain gauge, a strain gauge lead wire and a housing, the cylindrical The elastic induction body adopts a cylindrical elastic entity composed of elastic base materials. The cylindrical elastic induction body is added with a structure to increase the compressive modulus. This structure is integrally formed with the cylindrical elastic induction body. The structure includes inner bars and stirrups. The ribs are arranged inside the cylindrical elastic induction body, and the stirrups are installed circumferentially on the upper side or the lower side surface of the cylindrical elastic induction body of the resistance strain gauge. By changing the shape, size and density of the internal ribs, the compressive modulus of the cylindrical elastic sensor is changed to improve the measurement accuracy.

Description

technical field [0001] The invention relates to the field of earth pressure detection, in particular to a cylindrical body circumferential strain earth pressure sensor and a measuring method. Background technique [0002] Earth pressure testing equipment is an important equipment for geotechnical research and engineering testing, and its observation accuracy is very important. At present, the commonly used earth pressure testing equipment is the earth pressure cell. The earth pressure cell includes an outer membrane and an inner membrane. The outer membrane that the soil directly contacts with the box body or the inner membrane that indirectly bears force is used as the sensing membrane for pressure detection. Strain gauges or metal The chord measures the bending deformation of the membrane. Firstly, because the stiffness of the earth pressure cell and the stiffness of the measured soil often differ greatly, it constitutes the main systematic error; secondly, the parameter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22
Inventor 王俊刚智庆玺张君博赵迁乔张伟山郝先明
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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