CN204007960U - A kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor - Google Patents
A kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor Download PDFInfo
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- CN204007960U CN204007960U CN201420409818.4U CN201420409818U CN204007960U CN 204007960 U CN204007960 U CN 204007960U CN 201420409818 U CN201420409818 U CN 201420409818U CN 204007960 U CN204007960 U CN 204007960U
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- bolt
- bragg grating
- fiber
- grating type
- structure coupling
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Abstract
The utility model relates to technical field of civil engineering, a kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor specifically, comprise plain bolt, interplantation raster pattern force cell, fiber pigtail, the screw rod left and right sides at plain bolt sets respectively elongated groove, in groove, respectively implant a microgratings formula sensor, signal is drawn by carrying optical fiber, and optical fiber is close to screw rod wall and is arranged, and after the aperture of opening through nut relevant position, from nut end face, draw.Fiber pigtail is spreading arbitrarily, is convenient to adopt the remote read sensor data of fiber Bragg grating type (FBG) demodulator, realizes the stress of remote real-time monitoring structure coupling bolt.The utility model advantage is that built-in sensors volume is little, waterproof, corrosion-resistant, electrical insulation capability good, anti-electromagnetic interference capability is strong, outer substantially the same just as plain bolt after frock, easy for installation, can be adapted to complex environment and distant signal transmission, data stability is good, can realize long-range long term monitoring.
Description
[technical field]
The utility model relates to the load-bearing monitor technical field of assembled various members steel bolt used in civil engineering structure, is a kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor specifically.
[background technology]
In the city tunnel of current soft soil foundation, the tunnel, section of jurisdiction of shield construction is comparatively common a kind of version.Tunnel, section of jurisdiction main bearing member is a reinforced concrete annulus, whole concrete annulus cannot transport and install in tunnel, solution resolves into polylith by these concrete annulus exactly, decompose transportation, assembled in hole, these pieces are exactly section of jurisdiction, and it is exactly bolt that the pipe sheet assembling of these decomposition is become to the steel member of an annulus, and bolt mainly bears axial force.
Stress for segment assembly bolt used need be carried out Real-Time Monitoring, and the one, bolt strained whether overload that judgement monitors, prediction accident and risk, to take measures in time, prevents trouble before it happens; The 2nd, according to monitored bolt strained data, comprehensively to analyze, guiding construction, revises bolt design parameter and check construction is pre-designed, guarantees rationality and the economy of design and construction.Because main body after bolt installation is positioned at inside, section of jurisdiction, conventionally test means cannot be tested its force-bearing situation.
Number of patent application is that 02232164.0 Chinese patent discloses a kind of optical fibre intelligent screw bolt, comprise bolt, optical fiber interface and the absolute changing sensor of white light interference formula optical fiber, it is to be embedded in plain metal single head or stud bolt axial centre deep hole or open-work after the absolute changing sensor of white light interference formula optical fiber is made to optical fiber interface, uses epoxy resin filling in gap.This patented claim is to insert changing sensor after the boring of the middle part of bolt, and the precision that inconvenience and bolt monitoring are not only installed is not good.
[summary of the invention]
The purpose of this utility model is for also there is no in the market bolt strained monitoring sensor, and designs the fiber Bragg grating type structure coupling bolt load-bearing monitor sensor of coupling bolt load-bearing monitor between a kind of solution member that can be good.
To achieve these goals, a kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor is provided, comprise plain bolt, interplantation raster pattern force cell, fiber pigtail, the screw rod left and right sides at plain bolt sets respectively elongated groove, in groove, respectively implant a microgratings formula sensor, in the middle of the sidewall of bolt screw rod, be provided with fiber pigtail, the aperture that signal is opened through nut relevant position after being drawn by optical fiber is drawn from nut end face, stress to bolt realizes remote real-time monitoring, described fiber Bragg grating type structure coupling bolt load-bearing monitor senor operating temperature is-20 ℃～60 ℃, thin bolt maximum range is 150KN, thick bolt maximum range is 250KN, precision is for arriving 0.1KN.
Fiber pigtail is spreading arbitrarily, is convenient to adopt the remote read sensor data of fiber Bragg grating type (FBG) demodulator, thereby realizes the stress of remote real-time monitoring structure coupling bolt.
The utility model is compared with other force-measuring sensing technology in industry, there is following advantage: built-in sensors, volume is little, waterproof, corrosion-resistant, electrical insulation capability good, anti-electromagnetic interference capability is strong, outer substantially the same just as plain bolt after frock, easy for installation, can be adapted to complex environment and distant signal transmission, data stability is fine, can realize long-range long term monitoring.
[accompanying drawing explanation]
Fig. 1 is one-piece construction figure of the present utility model;
Fig. 2 is outboard profile of the present utility model;
Fig. 3 is front view (FV) of the present utility model;
Fig. 4 is stress calibration result of the present utility model;
In figure: 1, bolt 2, sensor tail optical fiber lead-in wire 3, microgratings formula sensor;
Specify Fig. 1 as Figure of abstract of the present utility model.
[embodiment]
Below in conjunction with accompanying drawing, the utility model is described in further detail, and the structure of this device and principle are very clearly concerning this professional people.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment 1
Basic fundamental thinking of the present utility model is the implantable miniature fiber Bragg grating type sensor of slotting on plain bolt, and ultimate principle is that the stressed surface that Fibre Optical Sensor is attached to bolt is out of shape it together with bolt, thereby records the strain and stress of bolt.Concrete technology is as follows: first bolt is processed to processing, at screw rod both sides fluting, fluting is of a size of 4 * 4mm (dark * wide), simultaneously in the punching of the position of nut respective slot.Fibre Optical Sensor is imbedded in bolt indentation, and transmission cable is drawn from nut aperture, finally uses structure glue closed pockets, and grating bolt is integrated, heat-shrinkable T bush sealing on list of bolts reduction of area more subsequently after encapsulation completes.Due to screw rod simultaneously tension and be subject to curved, in order to grasp the actual forced status of screw rod comprehensively, in this programme at screw rod symmetria bilateralis fluting, to tension with monitored by curved state simultaneously.
(1) installation of bolt meter: the same with plain bolt, use bolt meter to carry out pipe sheet assembling, bolt meter bearing tension, without changing mounting process, simple and convenient.
(2) line arrangement of bolt meter: utilize tail optical fiber that the signal of sensor is drawn, tail optical fiber can utilize ordinary optic fibre to carry out spreading, go between to monitoring equipment.
(3) bolt counts monitoring: in Control Room, utilize fiber Bragg grating (FBG) demodulator to carry out demodulation to bolt meter signal, thus the force-bearing situation of real-time or regular monitoring bolt.
In order to ensure the good serviceability of bolt meter, under lab designed bolt meter is carried out to test calibration.Due to the main bearing tension of bolt meter, for reduced data, process simultaneously, during Laboratory Calibration, adopt axial tensile state.Because bolt one end is screw thread, the other end is nut, utilizes custom-designed axial tensioning equipment, and bolt is loaded to test.Test result demonstration, the linearity of bolt meter and Repeatability are all fine, illustrate that this design can meet actual operation requirements.
The utility model uses in the Tunnel Engineering of the actual section of jurisdiction of shield construction, 40 this kind bolt meter has been installed in engineering altogether, on-the-spot simple installation, sensing data is realized long-term remote monitoring, the stressed size of bolt in section of jurisdiction and the stressed situation of change of carrying out along with the duration have been reflected truly, data precision is high, and good stability can meet engineering demand.
Claims (1)
1. a fiber Bragg grating type structure coupling bolt load-bearing monitor sensor, comprise plain bolt, interplantation raster pattern force cell, fiber pigtail, it is characterized in that setting respectively elongated groove in the screw rod left and right sides of plain bolt, in groove, respectively implant a microgratings formula sensor, in the middle of the sidewall of bolt screw rod, be provided with fiber pigtail, the aperture that signal is opened through nut relevant position after being drawn by optical fiber is drawn from nut end face, stress to bolt realizes remote real-time monitoring, described fiber Bragg grating type structure coupling bolt load-bearing monitor senor operating temperature is-20 ℃～60 ℃, maximum range is 250KN, precision is for arriving 0.1KN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409818.4U CN204007960U (en) | 2014-07-23 | 2014-07-23 | A kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420409818.4U CN204007960U (en) | 2014-07-23 | 2014-07-23 | A kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204007960U true CN204007960U (en) | 2014-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420409818.4U Withdrawn - After Issue CN204007960U (en) | 2014-07-23 | 2014-07-23 | A kind of fiber Bragg grating type structure coupling bolt load-bearing monitor sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204007960U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089729A (en) * | 2014-07-23 | 2014-10-08 | 上海市建筑科学研究院 | Stress monitoring sensor and method for connecting bolt of fiber bragg grating structure |
| CN107024306A (en) * | 2017-05-26 | 2017-08-08 | 大连理工大学 | A kind of intelligent bolt and method for monitoring complicated loads |
| CN107328503A (en) * | 2017-07-11 | 2017-11-07 | 中国矿业大学 | Coal mine tunnel top board Stress On-Line system and method based on fiber-optic grating sensor |
-
2014
- 2014-07-23 CN CN201420409818.4U patent/CN204007960U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089729A (en) * | 2014-07-23 | 2014-10-08 | 上海市建筑科学研究院 | Stress monitoring sensor and method for connecting bolt of fiber bragg grating structure |
| CN104089729B (en) * | 2014-07-23 | 2016-04-06 | 上海市建筑科学研究院 | A kind of bolt strained monitoring sensor of fiber Bragg grating type anatomical connectivity and method |
| CN107024306A (en) * | 2017-05-26 | 2017-08-08 | 大连理工大学 | A kind of intelligent bolt and method for monitoring complicated loads |
| CN107024306B (en) * | 2017-05-26 | 2023-02-17 | 大连理工大学 | Intelligent bolt and method for monitoring complex load effect |
| CN107328503A (en) * | 2017-07-11 | 2017-11-07 | 中国矿业大学 | Coal mine tunnel top board Stress On-Line system and method based on fiber-optic grating sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141210 Effective date of abandoning: 20160406 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |