CN202693170U - Fiber Bragg grating pre-stressed force-measuring rock bolt - Google Patents
Fiber Bragg grating pre-stressed force-measuring rock bolt Download PDFInfo
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- CN202693170U CN202693170U CN 201220313477 CN201220313477U CN202693170U CN 202693170 U CN202693170 U CN 202693170U CN 201220313477 CN201220313477 CN 201220313477 CN 201220313477 U CN201220313477 U CN 201220313477U CN 202693170 U CN202693170 U CN 202693170U
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- bragg grating
- fiber bragg
- rock bolt
- fiber
- measuring
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model relates to a fiber Bragg grating pre-stressed force-measuring rock bolt. The fiber Bragg grating pre-stressed force-measuring rock bolt comprises a rock bolt, a tray and a nut, wherein test interfaces are arranged on an end head of one end, where the nut is arranged, of the rock bolt; two sides of the rock bolt are respectively provided with a longitudinal groove which runs through the whole bolt body; a plurality of fiber Bragg grating strain sensors are arranged in each groove; and the fiber Bragg grating strain sensors are connected with the test interfaces through optical fibers. A using method comprises the following steps of: connecting the test interfaces with a fiber Bragg grating data acquisition system, arranging the rock bolt in a drilled hole, fixing the rock bolt in a rock body through an anchoring agent, rotating the nut to apply the prestress to the rock bolt till a designed value, obtaining strain change values of the fiber Bragg grating sensors in the construction process through the data acquisition system, and finally, obtaining the load change of the rock bolt in the construction process according to a calibration result of a laboratory. The fiber Bragg grating pre-stressed force-measuring rock bolt has a simple structure, can be simply and conveniently installed, and is easy to operate; and the sensors have strong anti-jamming capabilities, are high in measurement accuracy, and are safe and reliable.
Description
Technical field
The utility model relates to a kind of device for measuring force, and particularly a kind of fiber grating prestress force-measuring anchor stock is used for the Geotechnical Engineering fields such as mine.
Background technology
Force-measuring anchor stock is in order to study the mechanism of action and the problem such as stressing conditions and a kind of engineering device for measuring force developed of anchor pole in the Geotechnical Engineerings such as coal roadway support, slope reinforcement, tunnel support, at present, force-measuring anchor stock mainly contains resistance-strain type and steel chord type, wherein, the resistance-strain type of dynamometer anchor pole is used comparatively extensive, but the antijamming capability of the sensor of its use is not strong, stability is not high, and sensitivity is low, measuring accuracy is not high.Fiber grating sensing technology is a kind of brand-new sensing technology that emerges along with the development of Fabrication Methods of Fiber Gratings, its sensor has the advantages such as anti-electromagnetic interference (EMI), anticorrosive, electrical isolation, high sensitivity, and high temperature resistant, high pressure, safe and reliable, have broad application prospects.Fiber grating sensing technology not yet has the application precedent at the force-measuring anchor stock technical elements at present.
The utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of fiber grating prestress force-measuring anchor stock is provided, and this anchor pole antijamming capability is strong, measuring accuracy is high, can apply prestress safely and reliably.
For achieving the above object, the utility model adopts following technical proposals:
Fiber grating prestress force-measuring anchor stock, comprise anchor pole, pallet, nut, the termination of one end of anchor pole band nut is provided with test interface, the anchor pole both sides are respectively equipped with the longitudinal fluting that runs through together the whole body of rod, be provided with a plurality of fiber Bragg grating strain sensors in the per pass groove, fiber Bragg grating strain sensor is by optical fiber connecting test interface.
Described fiber Bragg grating strain sensor is evenly distributed in the longitudinal fluting of anchor rod body, and the corresponding test interface of each fiber Bragg grating strain sensor.
Described test interface is fixed in the containment vessel, and containment vessel is welded on the anchor pole.
On the described containment vessel end cap is arranged.
Described test interface is connected with the fiber grating data acquisition system (DAS) by optical fiber.
It is threaded that described anchor pole is equipped with the shank portion of nut and pallet.
The anchor pole model is selected according to the engineering actual conditions, and it is consistent with used anchor pole model in the engineering.
The using method of fiber grating prestress force-measuring anchor stock is: test interface is connected with the fiber grating data acquisition system (DAS), rockbolt installation is fixed in the rock mass in boring and by Anchor Agent, then rotating nut applies prestress to design load to anchor pole, obtain the strain variation value of fiber-optic grating sensor in the work progress by data acquisition system (DAS), according to the Laboratory Calibration result, finally obtain the magnitude of load of anchor pole in work progress and change again.
The utlity model has following advantage:
(1) simple in structure, simple installation, and easy operating;
(2) the sensor antijamming capability is strong, measuring accuracy is high, safe and reliable, can under the conditions such as high temperature, high pressure, work;
(3) can be widely used in the underground engineering field such as water conservancy, traffic, mine.
Description of drawings
Fig. 1 is the one-piece construction schematic diagram of the utility model fiber grating prestress force-measuring anchor stock;
Fig. 2 is the use schematic diagram of the utility model fiber grating prestress force-measuring anchor stock;
Wherein: 1-anchor pole; 2-nut; 3-pallet; 4-fiber Bragg grating strain sensor; 5-optical fiber; 6-test interface; 7-containment vessel; 8-end cap; 9-fiber grating data acquisition system (DAS); 10-Anchor Agent; 11-boring.
Embodiment
Below in conjunction with the embodiment in the accompanying drawing the utility model is described in further details.
Such as accompanying drawing 1, fiber grating prestress force-measuring anchor stock, comprise anchor pole 1, pallet 3, nut 2, anchor pole 1 is provided with test interface 6 with the termination of an end of nut 2, anchor pole 1 both sides are respectively equipped with the longitudinal fluting that runs through together the whole body of rod, be provided with a plurality of fiber Bragg grating strain sensors 4 in the per pass groove, fiber Bragg grating strain sensor 4 is by optical fiber 5 connecting test interfaces 6.
Described fiber Bragg grating strain sensor is evenly distributed in the longitudinal fluting of anchor rod body, and the corresponding test interface of each fiber Bragg grating strain sensor.Test interface 6 is fixed in the containment vessel 7, and containment vessel 7 is welded on the anchor pole 1, and end cap 8 is arranged on the containment vessel 7, and test interface 6 is connected with fiber grating data acquisition system (DAS) 9 by optical fiber 5.It is threaded that anchor pole 1 is equipped with the shank portion of nut 2 and pallet 3.
Such as accompanying drawing 2, when the utility model uses, test interface 6 is connected with fiber grating data acquisition system (DAS) 9, anchor pole 1 is installed in the boring 11 and by Anchor Agent 10 and is fixed in the rock mass, then 2 pairs of anchor poles 1 of rotating nut apply prestress to design load, obtain the strain variation value of fiber Bragg grating strain sensor 4 in the work progress by fiber grating data acquisition system (DAS) 9, again according to the Laboratory Calibration result, finally obtain the magnitude of load of force-measuring anchor stock in work progress and change.
As known by the technical knowledge, the utility model can be realized by other the embodiment that does not break away from its Spirit Essence or essential feature.Therefore, with regard to each side, all just illustrating, is not only.All in the utility model scope or the change that is being equal in the scope of the present utility model all be included in the utility model.
Claims (5)
1. fiber grating prestress force-measuring anchor stock, comprise anchor pole, pallet, nut, it is characterized in that, the termination of one end of anchor pole band nut is provided with test interface, the anchor pole both sides are respectively equipped with the longitudinal fluting that runs through together the whole body of rod, be provided with a plurality of fiber Bragg grating strain sensors in the per pass groove, fiber Bragg grating strain sensor is by optical fiber connecting test interface.
2. fiber grating prestress force-measuring anchor stock according to claim 1 is characterized in that, described fiber Bragg grating strain sensor is evenly distributed in the longitudinal fluting of anchor rod body, and the corresponding test interface of each fiber Bragg grating strain sensor.
3. fiber grating prestress force-measuring anchor stock according to claim 1 is characterized in that, described test interface is fixed in the containment vessel, and containment vessel is welded on the anchor pole.
4. fiber grating prestress force-measuring anchor stock according to claim 3 is characterized in that on the described containment vessel end cap being arranged.
5. fiber grating prestress force-measuring anchor stock according to claim 1 is characterized in that, described test interface is connected with the fiber grating data acquisition system (DAS) by optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313477 CN202693170U (en) | 2012-06-29 | 2012-06-29 | Fiber Bragg grating pre-stressed force-measuring rock bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220313477 CN202693170U (en) | 2012-06-29 | 2012-06-29 | Fiber Bragg grating pre-stressed force-measuring rock bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202693170U true CN202693170U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220313477 Expired - Fee Related CN202693170U (en) | 2012-06-29 | 2012-06-29 | Fiber Bragg grating pre-stressed force-measuring rock bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202693170U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720515A (en) * | 2012-06-29 | 2012-10-10 | 山东大学 | Fiber bragg grating prestress measurement anchor rod and application method thereof |
| CN103454021A (en) * | 2013-08-15 | 2013-12-18 | 中国矿业大学 | Roadway surrounding rock stress monitoring device based on fiber bragg grating sensing |
| CN107421588A (en) * | 2017-08-25 | 2017-12-01 | 吉林建筑大学 | Optical fiber grating sensing safety monitoring system in mine using novel anchor rod as sensing media |
| CN107631823A (en) * | 2017-09-30 | 2018-01-26 | 青岛理工大学 | A kind of total length bonds reinforced anchor bolt body of rod surface shear stress test device |
| US11619132B2 (en) | 2016-08-16 | 2023-04-04 | National Research Council Of Canada | Methods and systems for ultrasonic rock bolt condition monitoring |
-
2012
- 2012-06-29 CN CN 201220313477 patent/CN202693170U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720515A (en) * | 2012-06-29 | 2012-10-10 | 山东大学 | Fiber bragg grating prestress measurement anchor rod and application method thereof |
| CN103454021A (en) * | 2013-08-15 | 2013-12-18 | 中国矿业大学 | Roadway surrounding rock stress monitoring device based on fiber bragg grating sensing |
| US11619132B2 (en) | 2016-08-16 | 2023-04-04 | National Research Council Of Canada | Methods and systems for ultrasonic rock bolt condition monitoring |
| CN107421588A (en) * | 2017-08-25 | 2017-12-01 | 吉林建筑大学 | Optical fiber grating sensing safety monitoring system in mine using novel anchor rod as sensing media |
| CN107421588B (en) * | 2017-08-25 | 2020-03-31 | 吉林建筑大学 | Fiber bragg grating sensing mine safety monitoring system with anchor rod as sensing medium |
| CN107631823A (en) * | 2017-09-30 | 2018-01-26 | 青岛理工大学 | A kind of total length bonds reinforced anchor bolt body of rod surface shear stress test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20150629 |
|
| EXPY | Termination of patent right or utility model |