CN214308631U - Fiber grating strain sensor monitoring system for tunnel - Google Patents
Fiber grating strain sensor monitoring system for tunnel Download PDFInfo
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- CN214308631U CN214308631U CN202022961221.9U CN202022961221U CN214308631U CN 214308631 U CN214308631 U CN 214308631U CN 202022961221 U CN202022961221 U CN 202022961221U CN 214308631 U CN214308631 U CN 214308631U
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Abstract
The utility model discloses a fiber grating strain sensor monitoring system for tunnel relates to tunnel strain monitoring devices technical field. The utility model comprises a strain gauge, a mounting base and a cloud server, wherein the strain gauge comprises a plurality of horizontal fiber grating strain gauges arranged in the horizontal direction and a plurality of longitudinal fiber grating strain gauges arranged in the vertical direction; the transverse fiber grating strain gauge and the longitudinal fiber grating strain gauge are fixed on the tunnel wall through the mounting base, the strain gauges are electrically connected with an optical fiber demodulator, and the optical fiber demodulator is in communication connection with the cloud server. The utility model discloses a strainometer monitors the transverse stress and the longitudinal stress in tunnel to with signal transmission for the optic fibre demodulation appearance, finally pass to the cloud ware through wireless network transmission with the monitoring data, thereby realize providing safety precaution and appearance monitoring to the safe operation in tunnel, guarantee the safety in tunnel.
Description
Technical Field
The utility model belongs to the technical field of the tunnel strain monitoring device, especially, relate to a fiber grating strain sensor monitoring system for tunnel.
Background
The tunnel is an engineering building buried in the stratum, and the utilization of underground space is realized; the tunnel can be divided into a traffic tunnel, a hydraulic tunnel, a municipal tunnel, a mine tunnel, a military tunnel and the like. But after the tunnel is built, can't carry out comprehensive real time monitoring to the meeting an emergency in tunnel, because the existence of stress, tunnel hunch layer can take place certain deformation when atress or pressurized and natural change, leads to the tunnel to collapse easily after deformation and meeting an emergency exceed certain numerical value, has great risk.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fiber grating strain transducer monitoring system for tunnel monitors the transverse stress and the longitudinal stress in tunnel through the strainometer to give fiber demodulation appearance with the signal transmission, finally pass to the cloud ware through wireless network transmission with the monitoring data, thereby realize the comprehensive real-time remote monitoring to tunnel stress, thereby provide safety precaution and appearance monitoring to the safe operation in tunnel, guarantee the safety in tunnel.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to a fiber grating strain sensor monitoring system for tunnel, which comprises a strain gauge, an installation base and a cloud server, wherein the strain gauge comprises a plurality of horizontal fiber grating strain gauges arranged in the horizontal direction and a plurality of longitudinal fiber grating strain gauges arranged in the vertical direction; the transverse fiber grating strain gauge and the longitudinal fiber grating strain gauge are fixed on the tunnel wall through the mounting base, the strain gauges are electrically connected with an optical fiber demodulator, and the optical fiber demodulator is in communication connection with the cloud server.
Further, the mounting base comprises two supports, and the supports are mounted at two ends of the transverse fiber grating strain gauge or the longitudinal fiber grating strain gauge.
Furthermore, the side wall of the support is provided with a U-shaped groove.
Furthermore, the inner side wall of the support is provided with a threaded hole.
Further, the support is fixed to the tunnel wall by means of chemical anchors.
Furthermore, both ends of the strain gauge are provided with screw rods, one end of each screw rod is sleeved with a first nut, the other end of each screw rod is symmetrically sleeved with second nuts, and one support is located between the two second nuts.
Furthermore, the optical fiber demodulator is provided with a dynamic displacement testing module and a video image sensing module.
The utility model discloses following beneficial effect has:
the utility model discloses transversely lay eight horizontal fiber grating strainometers in tunnel hunch layer, vertically lay eight vertical fiber grating strainometers, single cross-section sixteen, transverse stress and the longitudinal stress through the strainometer to the tunnel monitor, and give optical fiber demodulation appearance with the signal transmission, finally pass to the cloud ware through wireless network transmission with the monitoring data, thereby realize the comprehensive real-time remote monitoring to tunnel stress, thereby provide safety precaution and appearance monitoring to the safe operation in tunnel, guarantee the safety in tunnel.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a fiber grating strain sensor monitoring system according to the present invention;
FIG. 2 is a right side view of a fiber grating strain sensor monitoring system;
FIG. 3 is a cross-sectional view taken along C-C of FIG. 2;
fig. 4 is a block diagram of the control system of the present invention;
FIG. 5 is a schematic structural view of the mounting base of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
the method comprises the following steps of 1-strain gauge, 2-cloud server, 3-mounting base, 4-fiber demodulation instrument, 101-transverse fiber grating strain gauge, 102-longitudinal fiber grating strain gauge, 103-first nut, 104-second nut, 301-support, 302-threaded hole, 401-dynamic displacement testing module and 402-video image sensing module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "open", "upper", "lower", "side wall", "both ends", "middle", "one end", "inner", "outer", etc. indicate positional or positional relationships, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Referring to fig. 1 to 4, a fiber grating strain sensor monitoring system for a tunnel includes a strain gauge 1, a mounting base 3 and a cloud server 2, where the strain gauge 1 has a temperature compensation characteristic, and can eliminate the influence of temperature change on the measurement of the strain gauge and can also be used as a thermometer; the strain gauge 1 comprises a plurality of horizontal fiber grating strain gauges 101 arranged in the horizontal direction and a plurality of vertical fiber grating strain gauges 102 arranged in the vertical direction, and the number of the horizontal fiber grating strain gauges 101 and the number of the vertical fiber grating strain gauges 102 are preferably eight.
The transverse fiber grating strain gauge 101 and the longitudinal fiber grating strain gauge 102 are fixed on the tunnel wall through the mounting base 3, the strain gauge 1 is electrically connected with the fiber demodulator 4, and the fiber demodulator 4 is in communication connection with the cloud server 2. The optical fiber demodulator 4 is provided with a dynamic displacement testing module 401 and a video image sensing module 402, can monitor the displacement of a central measuring point, can deform a tunnel arch layer to a certain extent when stressed or pressed and naturally changes, and provides safety early warning and morphology monitoring for the safe operation of the tunnel by matching with data detected by the dynamic displacement testing module 401.
Referring to fig. 5, preferably, the mounting base 3 includes two supporting seats 301, and the supporting seats 301 are mounted at two ends of the transverse fiber grating strain gauge 101 or the longitudinal fiber grating strain gauge 102, so that the strain gauge 1 can be stably mounted, and the accuracy of strain detection of the strain gauge 1 on the tunnel wall can be ensured; the U type groove has been seted up to support 301 lateral wall, and 1 both ends card of strainometer is gone into in the U type groove of support 1, and threaded hole 302 is seted up to support 301 inside wall, and support 301 uses the chemistry crab-bolt to pass through this threaded hole 302 and fixes on the tunnel wall, realizes the firm installation regulation of strainometer 1 installation.
Preferably, screws are arranged at two ends of strain gauge 1, one end of each screw is sleeved with a first nut 103, the other end of each screw is symmetrically sleeved with second nuts 104, one support 301 is located between the two second nuts 104, and the two second nuts 104 are not in contact with support 301.
Adopt above-mentioned structure, when carrying out the installation, install analog sensor on installation base 3, adopt the mode of chemical crab-bolt to fix installation base 3 on the tunnel wall, treat the residual stress release of installation base 3 and finish the back, pull down analog sensor, install horizontal fiber grating strainometer 101 on installation base 3 through two supports 301 earlier, adjust it through first nut 103 and second nut 104, rethread two supports 301 install vertical fiber grating strainometer 102 on installation base 3, adjust it through first nut 103 and second nut 104, detect strainometer 1's regulation numerical value through optical fiber demodulation appearance 2, be convenient for realize adjusting strain gauge 1, thereby guarantee the detection accuracy degree of strainometer 1 to tunnel wall meeting an emergency.
The monitoring method of the embodiment comprises the following steps: taking a certain section of a tunnel arch layer, arranging eight transverse fiber grating strain gauges 101 transversely on the section, arranging eight longitudinal fiber grating strain gauges 102 longitudinally, taking the center of the arch layer as a demarcation point, arranging three measuring points at one side far away from a mountain body and four measuring points at one side close to the mountain body, wherein one measuring point at the center is because the side close to the mountain body is easy to deform under a stress state, and the strain gauge 1 has a temperature compensation characteristic, can eliminate the influence of temperature change on strain gauge measurement, and can be used as a thermometer. When the device works, the strain of the tunnel arch layer is continuously measured in real time by using the transverse fiber grating strain gauge 101 and the longitudinal fiber grating strain gauge 102, a dynamic displacement testing module 401 processes data and transmits signals to the fiber demodulator 4, and then a video image sensing module 402 transmits detection signals to the cloud server 2, so that comprehensive real-time remote monitoring on the strain of the steel structure is realized; when the strain of the tunnel wall reaches a set value, remote communication alarm is realized, so that safety early warning and morphology monitoring are provided for the safe operation of the tunnel, and the safety of the tunnel is ensured.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a fiber grating strain sensor monitoring system for tunnel which characterized in that: the strain gauge comprises a strain gauge (1), a mounting base (3) and a cloud server (2), wherein the strain gauge (1) comprises a plurality of horizontal fiber bragg grating strain gauges (101) arranged in the horizontal direction and a plurality of longitudinal fiber bragg grating strain gauges (102) arranged in the vertical direction;
the transverse fiber grating strain gauge (101) and the longitudinal fiber grating strain gauge (102) are fixed on the tunnel wall through a mounting base (3), the strain gauge (1) is electrically connected with a fiber demodulator (4), and the fiber demodulator (4) is in communication connection with the cloud server (2).
2. The fiber grating strain sensor monitoring system for tunnels according to claim 1, wherein the mounting base (3) comprises two supports (301), the supports (301) being mounted at both ends of a transverse fiber grating strain gauge (101) or a longitudinal fiber grating strain gauge (102).
3. The fiber grating strain sensor monitoring system for the tunnel according to claim 2, wherein the side wall of the support (301) is provided with a U-shaped groove.
4. The fiber grating strain sensor monitoring system for the tunnel according to claim 3, wherein the inner side wall of the support (301) is provided with a threaded hole (302).
5. The fiber grating strain sensor monitoring system for tunnels according to claim 4, wherein the support (301) is fixed to the tunnel wall by means of chemical anchors.
6. The fiber bragg grating strain sensor monitoring system for the tunnel according to claim 2, wherein a screw is arranged at each end of the strain gauge (1), a first nut (103) is sleeved at one end of the screw, a second nut (104) is symmetrically sleeved at the other end of the screw, and a support (301) is located between the two second nuts (104).
7. The fiber bragg grating strain sensor monitoring system for the tunnel according to claim 6, wherein a dynamic displacement testing module (401) and a video image sensing module (402) are arranged on the fiber optic demodulator (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022961221.9U CN214308631U (en) | 2020-12-10 | 2020-12-10 | Fiber grating strain sensor monitoring system for tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022961221.9U CN214308631U (en) | 2020-12-10 | 2020-12-10 | Fiber grating strain sensor monitoring system for tunnel |
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| CN214308631U true CN214308631U (en) | 2021-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114333188A (en) * | 2021-12-09 | 2022-04-12 | 中铁建大桥工程局集团第五工程有限公司 | Tunnel collapse early warning device |
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2020
- 2020-12-10 CN CN202022961221.9U patent/CN214308631U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114333188A (en) * | 2021-12-09 | 2022-04-12 | 中铁建大桥工程局集团第五工程有限公司 | Tunnel collapse early warning device |
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