Force measurement method of FBG force measurement anchor rod

A bolt and force measurement technology, which is applied in the field of force measurement of FBG force measurement bolts, can solve the problems of complex installation and unstable monitoring accuracy, achieve small transmission loss, eliminate the influence of light source power fluctuation and system loss, small size effect

Inactive Publication Date: 2019-09-27
TAIYUAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of unstable monitoring accuracy and complex installation existing in the existing bolt monitoring device, the present invention provides a method for measuring the force of an FBG force-measuring bolt

Method used

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  • Force measurement method of FBG force measurement anchor rod
  • Force measurement method of FBG force measurement anchor rod
  • Force measurement method of FBG force measurement anchor rod

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Embodiment Construction

[0040] The present invention will be further described in conjunction with the accompanying drawings.

[0041] FBG force-measuring bolts, including bolts, bolt anchoring agents, FBG gratings, optical fiber cables, backing plates, and bolt locking devices.

[0042] The diameter of the anchor rod is 16mm, the length is 160cm, the cross section is circular, and the material is the anchor rod of 45# carbon structural steel. Three grooves with a depth of 1.5mm and a width of 2mm are polished along the axial direction on the surface of the anchor rod , and the three grooves are 120° to each other along the axial section.

[0043] The bolt anchoring agent is a fast-curing epoxy adhesive divided into A glue and B glue.

[0044] The FBG grating is a pure silica fiber grating string.

[0045] Such as figure 1 As shown in Fig. 1, three grooves are ground at 120° to each other on the surface of the anchor rod along the axial section. A group of fiber grating strings are arranged in each ...

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Abstract

The invention provides a force measurement method of an FBG force measurement anchor rod, and belongs to the technical field of anchor rod monitoring, the problems that the monitoring accuracy of the existing anchor rod monitoring device is unstable and that the installation is complicated can be solved, and the force measurement anchor rod is composed of an anchor rod, an anchor rod anchoring agent, an FBG optical grating, an optical fiber connecting line, a backing plate and an anchor rod locking device. Three grooves are formed in the surface of the anchor rod along the axial section direction in a manner of forming 120 degrees with one another, fiber bragg grating strings are disposed in the grooves, and 5 FGB sensors are equidistantly arranged along the length direction of the anchor rod. The full name of FBG is Fiber Bragg Grating, that is, fiber Bragg grating. The force measurement anchor rod adopts the FBG as an intelligent sensing element, which can not only detect the axial load of the anchor rod, but also can detect the radial load of the anchor rod. The device provided by the invention has the advantages of simple structure, convenient installation, high accuracy and good stability.

Description

technical field [0001] The invention belongs to the technical field of bolt monitoring, and in particular relates to a method for measuring force of an FBG force-measuring bolt. Background technique [0002] Since bolt support was used in coal mines, a large number of practical applications have shown that this method is the most economical and effective. However, because the bolt support is a concealed project, it is difficult to know the stress distribution of the underground rock mass in advance, and the factors affecting the stability of the rock mass are also very complicated. Due to the long support period of the anchor bolt, the stress of the anchor bolt in the surrounding rock changes violently or slowly over time under the combined influence of the above-mentioned related factors. If the stress of the anchor rod exceeds the limit that the anchor rod itself can bear, it will lead to failure or even fracture of the anchor rod, which may further cause roadway collapse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/246
Inventor 郝兵元王东亮任兴云章嘉康谢益盛梁晓敏李铁良
Owner TAIYUAN UNIV OF TECH
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