CN202614434U - Fiber grating force sensor for anchor bolt - Google Patents
Fiber grating force sensor for anchor bolt Download PDFInfo
- Publication number
- CN202614434U CN202614434U CN 201220191054 CN201220191054U CN202614434U CN 202614434 U CN202614434 U CN 202614434U CN 201220191054 CN201220191054 CN 201220191054 CN 201220191054 U CN201220191054 U CN 201220191054U CN 202614434 U CN202614434 U CN 202614434U
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- anchor
- fiber grating
- optical cable
- optical
- anchor pole
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Abstract
A fiber grating force sensor for an anchor bolt mainly comprises a force bearing elastomer, a fiber grating, an anchor-bolt connecting cylinder, an anchor-bolt connecting head, an optical-cable fixing seat, an optical-cable connecting head and a protection optical cable. One end of the anchor-bolt connecting head is in weld connection with an anchor bolt, while the other end is in threaded connection with the force bearing elastomer by the anchor-bolt connecting cylinder. A groove is arranged in the surface of the force bearing elastomer, and the fiber grating is bonded in the groove of the force bearing elastomer. A tail fiber of the fiber grating is securely connected with the protection optical cable through the optical-cable connecting head and the optical-cable fixing seat. The protection optical cable is fixed on the optical-cable connecting head, and the optical-cable connecting head is fixed on the force bearing elastomer by the optical-cable fixing seat. During a geotechnical protection engineering on-site construction, the force bearing elastomer, the fiber grating and the anchor bolt can be conveniently connected together by the anchor-bolt connecting cylinder and the anchor-bolt connecting head. The sensor can be directly installed in construction site, preventing the trouble of bonding the fiber grating to the anchor bolt in construction site, and thereby facilitating the installation.
Description
Technical field
The present invention relates to a kind of grating anchor rod force-measuring sensor, be a kind ofly be convenient to transport, a kind of novel anchor rod force cell of assembled on site and construction.Belong to technical field of optical fiber sensing.
Technical background
In traditional ground protection works, electrical sensor is usually adopted in the stressed monitoring of anchor pole, yet anchor pole is operated in the rugged surroundings of humidity and soda acid salt corrosion, and is very high for performance demands such as the protection against the tide of sensor, anticorrosion, waterproof.Electrical sensor not only exists defectives such as poor anti jamming capability, stability is bad, the life-span is short in long term monitoring; And can not be connected in series use; If when a plurality of anchor rod force-measuring sensor is installed on an anchor pole; Must need a lot of signal transmssion lines, bring huge monitoring equipment simultaneously, bring very big inconvenience for on-the-spot installation and monitoring.
Fiber-optic grating sensor be not afraid of humidity, corrosion-resistant, the life-span is long; Can be connected in series multiplexing between a plurality of sensors; Reach in the monitoring system of certain scale in number of sensors, avoid taking the great amount of data transmission circuit, also reduced a large amount of signal monitoring equipment simultaneously; In ground protection works safety monitoring system, have the irreplaceable effect of other type sensor, just progressively cause people's extensive interest.But in ground protection works safety monitoring system, optical fiber grating sensing also is in the primary stage of applying, and on the technology and technology of sensor production and installation, also needs further to improve and development.
Nan Qiuming etc. directly stick on fiber grating on the anchor pole in anchoring safety monitoring engineering; (referring to document " application of SMD FBG sensor in anchoring engineering "; From academic journal " scientific and technical information ", 2006 (1)) carry out the stressed monitoring of anchor bolt construction process.Application number is that the anchor pole that 200710130126.0 one Chinese patent application " is the optical fiber grating sensing mine safety detection technique of sensing media with the novel anchor rod " proposes receives force monitoring methods, also is that fiber grating is directly sticked on the anchor pole.This have a lot of shortcomings in the mode of directly pasting fiber grating on the anchor pole: (1) sticks on fiber grating on the anchor pole that reaches several meters or tens of meters, and fiber grating very easily damages in transportation, carrying and installation process; (2) because the working-yard condition is very poor, the measurement result reliability of pasting fiber grating at the construction field (site) can not guarantee.In the patent No. is in the Chinese patent " a kind of mountable anchor pole " of " 200920310115.5 ", mentions and uses fiber grating monitoring axis force of anchor, still, in this patent, does not provide the method for application of fiber grating.
Summary of the invention
The utility model is to the deficiency of prior art, and a kind of grating anchor rod force-measuring sensor of being convenient to assemble with site operation is provided, and can in Geotechnical Engineering protection safety monitoring system, obtain application.
The purpose of the utility model reaches through following technical scheme:
A kind of grating anchor rod force-measuring sensor mainly is made up of stressed elastic body, fiber grating, anchor pole connecting cylinder, anchor pole connector, optical cable fixed pedestal, optical cable connector and protection optical cable; Described anchor pole connects first end and the anchor pole welding is fixing; The other end is threaded fixing through described anchor pole connecting cylinder with stressed elastic body; Described stressed surface of elastomer is fluted; Fiber grating is pasted in the stressed elastomeric surface groove, and the fiber grating tail optical fiber is connected fixing with the protection optical cable through optical cable connector and optical cable fixed pedestal, and the protection optical cable is fixed in the optical cable connector; The optical cable connector is fixed on stressed surface of elastomer through the optical cable fixed pedestal.
The described stressed elastic body of the utility model is the main stressed member of sensor; Do the time spent when receiving axis force of anchor; External tensile force is converted into strain and acts on fiber grating; Fiber grating receives changing of effects of strain reflecting light long hair, and the wavelength change of fiber grating is just can the perception anchor pole stressed through the monitoring of external optic fiber grating wavelength (FBG) demodulator.
Stressed elastic body is a cylindrical structural.Stressed elastic body two ends are threaded, and are used for fixing with the anchor pole connecting cylinder; Stressed surface of elastomer is fluted, and respectively there is an optical cable fixed pedestal at the groove two ends, are used for fixing the protection optical cable.
The utility model have a following advantage:
1, the sensor anchor pole connection fittings that constitute of the sensor dynamometry main part that mainly is made up of stressed elastic body and fiber grating of this grating anchor rod force-measuring sensor and anchor pole connecting cylinder and anchor pole connector are formed.When ground protection works site operation, available anchor pole connection fittings link together the main part and the anchor pole of anchor rod force-measuring sensor easily.The trouble of having avoided the working-yard directly on anchor pole, to paste fiber grating;
2, fiber grating has obtained fine protection on the anchor rod force-measuring sensor, not frangible, conveniently transportation; Sensor can directly be installed at the construction field (site), and is easy for installation.
Description of drawings
Fig. 1 is a grating anchor rod force-measuring sensor construction synoptic diagram.
Among the figure: the stressed elastic body of 1-, the 2-fiber grating, 3-anchor pole connecting cylinder, 4-anchor pole connector, 5-optical cable fixed pedestal, 6-cable protection joint, 7-protects optical cable.
Embodiment
Below in conjunction with Fig. 1 the embodiment of the utility model is done further to set forth.
The grating anchor rod force-measuring sensor (as shown in Figure 1) of the utility model design mainly is made up of stressed elastic body 1, fiber grating 2, anchor pole connecting cylinder 3, anchor pole connector 4, optical cable fixed pedestal 5, optical cable connector 6 and protection optical cable 7.Stressed elastic body 1 is as the main stressed member of sensor, and its two ends are connected with anchor pole through anchor pole connecting cylinder 3, anchor pole connector 4; Anchor pole connector 4 one ends and anchor pole welding are fixing, and the other end has external thread, is used for being connected with the stressed elastic body of sensor; Anchor pole connecting cylinder 3 has internal thread, and the anchor pole connector 4 that will weld fixing anchor bar with it links together with stressed elastic body 1; Stressed elastic body 1 surface is fluted, and fiber grating 2 sticks in the groove of stressed surface of elastomer, and its tail optical fiber passes optical cable connector 6, and with protecting optical cable 7 to be connected; Protection optical cable 7 is fixed in optical cable connector 6; Optical cable connector 6 is fixed on stressed surface of elastomer through optical cable fixed pedestal 5.Stressed elastic body receives axis force of anchor and does the time spent; External tensile force is converted into strain and acts on fiber grating; Fiber grating receives changing of effects of strain reflecting light long hair, and the wavelength change of fiber grating is just can the perception anchor pole stressed through the monitoring of external optic fiber grating wavelength (FBG) demodulator.
Method for making is at first to be encapsulated in the groove of stressed elastic body 1 with the fiber grating 2 of epoxy resin gluing agent with stretch-draw; Again with the tail optical fiber of fiber grating 2 be fixed on the cable protection joint 6 after protection optical cable 7 is connected; The cable protection joint screw thread is connected on the optical cable fixed pedestal 5, and optical cable fixed pedestal 5 is fixed on the stressed elastic body 1 through screw.In the installation process at the scene, earlier anchor pole connector 4 is welded on the anchor pole, passes through anchor pole connecting cylinder 3 and stressed elastic body 1 screw fixed together then.
The signal of grating anchor rod force-measuring sensor is transported in the monitoring system of being made up of optic fiber grating wavelength (FBG) demodulator and computing machine through the protection optical cable, carries out signal data and handles and store.
Claims (2)
1. grating anchor rod force-measuring sensor; It is characterized in that this sensor mainly is made up of stressed elastic body (1), fiber grating (2), anchor pole connecting cylinder (3), anchor pole connector (4), optical cable fixed pedestal (5), optical cable connector (6) and protection optical cable (7); Described anchor pole connector (4) one ends and anchor pole welding are fixing; The other end is threaded fixing through anchor pole connecting cylinder (3) with stressed elastic body (1); Stressed elastic body (1) surface is fluted; Fiber grating (2) is pasted in the groove of stressed elastic body (1), and tail optical fiber is connected fixing with protection optical cable (7) through optical cable connector (6) and optical cable fixed pedestal (5), and protection optical cable (7) is fixed on the optical cable connector (6); Optical cable connector (6) is fixed on stressed surface of elastomer through optical cable fixed pedestal (5).
2. according to claims 1 described grating anchor rod force-measuring sensor, it is characterized in that described stressed elastic body is cylindrical, two ends are threaded, and the surface is fluted, and respectively there is an optical cable fixed pedestal (5) at the groove two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220191054 CN202614434U (en) | 2012-05-02 | 2012-05-02 | Fiber grating force sensor for anchor bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220191054 CN202614434U (en) | 2012-05-02 | 2012-05-02 | Fiber grating force sensor for anchor bolt |
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| Publication Number | Publication Date |
|---|---|
| CN202614434U true CN202614434U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220191054 Expired - Fee Related CN202614434U (en) | 2012-05-02 | 2012-05-02 | Fiber grating force sensor for anchor bolt |
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| CN (1) | CN202614434U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353367A (en) * | 2013-07-04 | 2013-10-16 | 中山大学 | Rock and soil reinforcement bar outer end force sensor based on fiber bragg grating |
| CN103512687A (en) * | 2013-10-22 | 2014-01-15 | 国网电力科学研究院 | Optical fiber reinforcement meter |
| CN103913125A (en) * | 2012-12-28 | 2014-07-09 | 同方威视技术股份有限公司 | Protective net monitoring system |
| CN105403339A (en) * | 2015-12-15 | 2016-03-16 | 中国电建集团中南勘测设计研究院有限公司 | Anchor pole force measuring apparatus, anchor pole and anchor pole tension measuring method |
| CN105628271A (en) * | 2014-11-06 | 2016-06-01 | 上海启鹏工程材料科技有限公司 | Fiber grating cable tension meter |
| CN106441660A (en) * | 2016-12-02 | 2017-02-22 | 西南交通大学 | Anchor bolt pad force measuring device |
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN111721220A (en) * | 2020-05-07 | 2020-09-29 | 成都伊莱特光测科技有限公司 | Debris flow optical fiber monitoring device |
| CN112031845A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Coal rock interface stability measuring device of fiber grating composite construction |
-
2012
- 2012-05-02 CN CN 201220191054 patent/CN202614434U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913125A (en) * | 2012-12-28 | 2014-07-09 | 同方威视技术股份有限公司 | Protective net monitoring system |
| CN103353367A (en) * | 2013-07-04 | 2013-10-16 | 中山大学 | Rock and soil reinforcement bar outer end force sensor based on fiber bragg grating |
| CN103353367B (en) * | 2013-07-04 | 2016-10-26 | 中山大学 | A kind of rock-reinforcing rod member outer end based on fiber grating force cell |
| CN103512687A (en) * | 2013-10-22 | 2014-01-15 | 国网电力科学研究院 | Optical fiber reinforcement meter |
| CN105628271A (en) * | 2014-11-06 | 2016-06-01 | 上海启鹏工程材料科技有限公司 | Fiber grating cable tension meter |
| CN105403339A (en) * | 2015-12-15 | 2016-03-16 | 中国电建集团中南勘测设计研究院有限公司 | Anchor pole force measuring apparatus, anchor pole and anchor pole tension measuring method |
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN106906824B (en) * | 2015-12-22 | 2020-10-09 | 中国水利水电科学研究院 | Distributed optical fiber prestress intelligent monitoring anchor cable |
| CN106441660A (en) * | 2016-12-02 | 2017-02-22 | 西南交通大学 | Anchor bolt pad force measuring device |
| CN111721220A (en) * | 2020-05-07 | 2020-09-29 | 成都伊莱特光测科技有限公司 | Debris flow optical fiber monitoring device |
| CN112031845A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Coal rock interface stability measuring device of fiber grating composite construction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20130502 |