Tunnel chipping identification monitoring device based on optical fiber sensing technology

Abstract

The utility model provides a tunnel chipping identification monitoring device based on an optical fiber sensing technology, which comprises a fixed point monitoring assembly, the fixed point monitoring assembly is continuously arranged and connected to the top of a tunnel in a fixed point manner, the fixed point monitoring assembly comprises a fixed point optical cable and a plurality of fixed point clamps, the fixed point optical cable is clamped into the fixed point clamps, and the fixed point optical cable is connected with the fixed point clamps. The end part of the fixed-point optical cable is connected to a distributed optical fiber strain demodulator so as to realize identification and monitoring of tunnel chipping; the problem of low manual detection efficiency of the existing water delivery tunnel falling blocks is solved, multi-point and long-distance continuous automatic monitoring of the tunnel structure is realized, the possibility of missing detection and missing detection is avoided, the monitoring precision and comprehensiveness are improved, and reliable monitoring data are provided.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel block - fall identification, and particularly relates to a tunnel block - fall identification and monitoring device based on optical fiber sensing technology. Background Technique

[0002] The water conveyance tunnel is in a water - filled environment for a long time, and the strength of the surrounding rock or lining is prone to decline. When subjected to stratum deformation, block - fall phenomena are likely to occur, affecting the operation ability of the water conveyance tunnel and even triggering tunnel collapse, resulting in serious engineering accidents.

[0003] At present, there are the following technical problems in the identification of tunnel block - fall diseases:

[0004] The existing technology mainly relies on the conventional manual inspection system. The identification of block - fall diseases is not timely, prone to missed detection, and has low detection efficiency.

[0005] Traditional devices for monitoring tunnel block - fall may need to directly contact the tunnel structure, which is both dangerous and may damage the existing structure.

[0006] Traditional devices cannot achieve multi - point and long - distance continuous monitoring of the tunnel structure, increasing the possibility of missed detection and missed measurement, and reducing the monitoring accuracy and comprehensiveness.

[0007] The environment in the tunnel is relatively harsh. When traditional devices monitor tunnel block - fall, their anti - electromagnetic interference ability and corrosion resistance are poor, and they cannot provide reliable monitoring data. Content of the Utility Model

[0008] In order to solve the technical problems of low efficiency of manual detection of block - fall in existing water conveyance tunnels, inability to achieve multi - point and long - distance continuous monitoring of the tunnel structure, prone to missed detection, and inability to provide reliable monitoring data, the utility model proposes a tunnel block - fall identification and monitoring device based on optical fiber sensing technology, which solves the problem of low efficiency of manual detection of tunnel block - fall, realizes multi - point and long - distance continuous automatic monitoring of the tunnel structure, avoids the possibility of missed detection and missed measurement, improves the monitoring accuracy and comprehensiveness, and provides reliable monitoring data.

[0009] In order to achieve the above - mentioned purpose, the technical solution of the utility model is as follows:

[0010] On the one hand, the utility model provides a tunnel block - fall identification and monitoring device based on optical fiber sensing technology, including: a fixed - point monitoring component, the fixed - point monitoring component is continuously and fixedly arranged and connected to the top of the tunnel. The fixed - point monitoring component includes: a fixed - point optical cable and a plurality of fixed - point clamps. The fixed - point optical cable is clamped into the fixed - point clamps, and the end of the fixed - point optical cable is connected to a distributed optical fiber strain demodulator to realize the identification and monitoring of tunnel block - fall.

[0011] A tunnel block - falling recognition and monitoring device based on optical fiber sensing technology provided by the utility model solves the problem of low efficiency of manual detection of existing tunnel block - falling, realizes continuous automatic monitoring of multiple points and long distances of the tunnel structure, avoids the possibility of missed detection and missed measurement, improves the accuracy and comprehensiveness of monitoring, and provides reliable monitoring data.

[0012] As a preferred technical solution, the fixed - point optical cable includes: a sensing optical cable, and a plurality of anchor fixed - point components are equidistantly arranged on the sensing optical cable.

[0013] As a preferred technical solution, the sensing optical cable is fixedly coupled to the anchor fixed - point components at fixed points through an epoxy resin coupling layer.

[0014] As a preferred technical solution, each of the anchor fixed - point components is formed by splicing two semi - circular structures, and the anchor fixed - point component is connected to the sensing optical cable.

[0015] As a preferred technical solution, the sensing optical cable includes: an optical fiber, a coating layer is provided on the surface of the optical fiber, and a sheath is provided outside the optical fiber.

[0016] As a preferred technical solution, the fixed - point fixture includes: a substrate, corresponding movable grooves are provided on the substrate, a card slot is further provided on the substrate between the movable grooves, and a plurality of grooves are provided on the inner wall of the card slot.

[0017] As a preferred technical solution, a plurality of transverse ribs are provided on the outer side wall of the anchor fixed - point component, the transverse ribs correspond to and cooperate with the grooves to clamp the fixed - point optical cable into the fixed - point fixture.

[0018] As a preferred technical solution, the fixed - point optical cable is arranged in a straight line on the top of the tunnel through the fixed - point fixture.

[0019] As a preferred technical solution, the card slot is in a circular arc structure.

[0020] As a preferred technical solution, the length of the fixed - point fixture is 10 - 15 cm.

[0021] A tunnel block - falling recognition and monitoring device based on optical fiber sensing technology provided by the utility model has the following beneficial effects:

[0022] 1) It solves the problem of low efficiency of manual detection of existing tunnel block - falling, realizes continuous automatic monitoring of multiple points and long distances of the tunnel structure, avoids the possibility of missed detection and missed measurement, improves the accuracy and comprehensiveness of monitoring, and provides reliable monitoring data;

[0023] 2) The present application purposefully selects to continuously and fixedly arrange and connect the fixed-point monitoring component on the top of the water conveyance tunnel. The fixed-point optical cable is clamped into the fixed-point fixture, and the end of the fixed-point optical cable is connected to the distributed optical fiber strain demodulator to realize the identification and monitoring of tunnel block shedding. By converting the displacement deformation of the tunnel block shedding into the strain deformation of the fixed-point optical cable and observing the strain distribution law of the fixed-point optical cable, the identification and monitoring of the tunnel block shedding are realized, solving the problem of low efficiency of manual detection of existing tunnel block shedding, achieving multi-point and long-distance continuous automatic monitoring of the tunnel structure, avoiding the possibility of missed inspection and missed measurement, improving the accuracy and comprehensiveness of monitoring, and providing reliable monitoring data;

[0024] The present application purposefully selects the fixed-point optical cable, which has many advantages in terms of size, cost, lifespan, resolution, electromagnetic interference resistance ability, etc., and is more suitable for the relatively harsh environment inside the tunnel to realize multi-point and long-distance continuous automatic monitoring of the tunnel structure for block shedding information.

[0025] 3) According to the monitoring section of the water conveyance tunnel, the present application purposefully selects to arrange the fixed-point optical cable in a straight line through the fixed-point fixture on the top of the tunnel, with continuous fixed-point arrangement, realizing multi-point and long-distance continuous automatic monitoring of the tunnel structure, avoiding the possibility of missed inspection and missed measurement, and improving the accuracy and comprehensiveness of monitoring.

[0026] 4) The present application purposefully selects to fixedly couple the sensing optical cable with the anchor fixing point through the epoxy resin coupling layer, aiming to ensure that the sensing optical cable can be stably and reliably fixed on the anchor fixing point, so as to conduct accurate monitoring or data transmission.

[0027] 5) The present application purposefully selects that the transverse rib corresponds to and cooperates with the groove to clamp the fixed-point optical cable into the fixed-point fixture. Its structure is simple and the operation is convenient. Adopting the above structure increases the coupling effect between the fixed-point fixture and the fixed-point optical cable. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of a tunnel block shedding identification and monitoring device based on optical fiber sensing technology provided by the present utility model;

[0029] Figure 2 It is a schematic structural diagram of the fixed-point optical cable provided by the present utility model;

[0030] Figure 3 It is a schematic structural diagram of the fixed-point fixture provided by the present utility model;

[0031] Figure 4 It is a diagram of the indoor test results of a tunnel block shedding identification and monitoring device based on optical fiber sensing technology provided by the present utility model;

[0032] Among them, 1 - fixed-point optical cable; 11 - sensing optical cable; 111 - optical fiber; 112 - sheath; 12 - anchor fixing point component; 121 - transverse rib; 2 - fixed-point clamp; 21 - substrate; 22 - card slot; 221 - groove; 23 - movable slot; 3 - distributed optical fiber strain demodulator. Detailed implementation mode

[0033] The preferred implementation mode of the present utility model will be described in detail below with reference to the accompanying drawings.

[0034] As Figure 1 shown, the present utility model provides a tunnel block fall recognition and monitoring device based on optical fiber sensing technology, including: a fixed-point monitoring component, the fixed-point monitoring component is continuously and fixedly arranged and connected to the top of the tunnel, the fixed-point monitoring component includes: a fixed-point optical cable 1 and a plurality of fixed-point clamps 2, the fixed-point optical cable 1 is clamped into the fixed-point clamp 2, and the end of the fixed-point optical cable 1 is connected to a distributed optical fiber strain demodulator 3 to realize the recognition and monitoring of tunnel block falls.

[0035] A tunnel block fall recognition and monitoring device based on optical fiber sensing technology provided by the present utility model solves the problem of low efficiency of manual detection of existing tunnel block falls, realizes continuous automatic monitoring of multiple points and long distances of the tunnel structure, avoids the possibility of missed detection and missed measurement, improves the accuracy and comprehensiveness of monitoring, and provides reliable monitoring data.

[0036] The present application purposefully selects the fixed-point monitoring component to be continuously and fixedly arranged and connected to the top of the water conveyance tunnel. The fixed-point optical cable 1 is clamped into the fixed-point clamp 2, and the end of the fixed-point optical cable 1 is connected to the distributed optical fiber strain demodulator 3 to realize the recognition and monitoring of tunnel block falls. By converting the displacement deformation of the tunnel block fall into the strain deformation of the fixed-point optical cable 1 and observing the strain distribution law of the fixed-point optical cable 1, the recognition and monitoring of the tunnel block fall are realized, solving the problem of low efficiency of manual detection of existing tunnel block falls, realizing continuous automatic monitoring of multiple points and long distances of the tunnel structure, avoiding the possibility of missed detection and missed measurement, improving the accuracy and comprehensiveness of monitoring, and providing reliable monitoring data;

[0037] The present application purposefully selects the fixed-point optical cable 1, which has many advantages in terms of size, cost, service life, resolution, electromagnetic interference resistance ability, etc., and is more suitable for realizing continuous automatic monitoring of block fall information at multiple points and long distances of the tunnel structure under relatively harsh environmental conditions in the tunnel.

[0038] The present application purposefully selects the end of the fixed-point optical cable 1 to be connected to the distributed optical fiber strain demodulator 3 to realize the demodulation and wireless transmission of the strain information of the sensing optical cable 11 and realize the recognition and monitoring of tunnel block falls.

[0039] The utility model discloses a device for identifying fallen blocks in a water conveyance tunnel based on optical fiber sensing technology, which includes a fixed-point optical cable 1, a fixed-point fixture 2, and a distributed optical fiber strain demodulation instrument 3. The fixed-point optical cable 1 consists of a sensing optical cable 11 and an anchor fixed-point part 12. The fixed-point optical cable 1 is clamped into the fixed-point fixture 2 through the anchor fixed-point part 12 to form a fixed-point monitoring assembly. According to the monitoring section of the water conveyance tunnel, the fixed-point monitoring assembly composed of the fixed-point optical cable 1 and the fixed-point fixture 2 is fixed in a straight line on the top of the tunnel. The end of the fixed-point optical cable 1 is connected to the distributed strain demodulation instrument 3 to realize the automatic monitoring of fallen blocks in the tunnel. By converting the displacement deformation of the fallen blocks in the tunnel into the strain deformation of the fixed-point optical cable 1 and observing the strain distribution law of the fixed-point optical cable 1, the identification and monitoring of fallen blocks in the water conveyance tunnel are realized, solving the problem of low efficiency of manual detection of fallen blocks in the existing water conveyance tunnel, achieving multi-point and long-distance continuous automatic monitoring of the tunnel structure, avoiding the possibility of missed detection and missed measurement, and being able to quickly identify and monitor the fallen block information along the tunnel in real time.

[0040] When a fallen block occurs on the top of the tunnel, it will cause the fixed-point optical cable 1 fixed on the top of the tunnel to undergo axial tensile deformation. Since the stones in the fallen block area will have a certain constraining effect on the axial deformation of the fixed-point optical cable 1 and limit the deformation, it will cause the local strain of the fixed-point optical cable 1 to decrease, resulting in the strain of the fixed-point optical cable 1 at the position where the fallen block occurs showing a trend of being high on both sides and slightly low in the middle. By observing and monitoring the strain distribution law of the fixed-point optical cable 1, the fallen block information of the tunnel can be identified. In addition, through the local strain reduction area of the fixed-point optical cable 1, the size of the fallen block in the tunnel can be discriminated and monitored.

[0041] As Figure 2 shown, the fixed-point optical cable 1 includes: a sensing optical cable 11, on which a plurality of anchor fixed-point parts 12 are equidistantly arranged. The sensing optical cable 11 is fixedly coupled to the anchor fixed-point parts 12 through an epoxy resin coupling layer. Each anchor fixed-point part 12 is formed by splicing two semi-circular structures. The anchor fixed-point part 12 is connected to the sensing optical cable 11. The sensing optical cable 11 includes: an optical fiber 111, on the surface of which a coating layer is provided. A sheath 112 is provided outside the optical fiber 111. A plurality of transverse ribs 121 are provided on the outer side wall of the anchor fixed-point part 12.

[0042] As Figure 3 shown, the fixed-point fixture 2 includes: a substrate 21, on which corresponding movable grooves 23 are provided. A clamping groove 22 is also provided on the substrate 21 between the movable grooves 23. The clamping groove 22 has a circular arc structure. A plurality of grooves 221 are provided on the inner wall of the clamping groove 22. The transverse ribs 121 correspond to and cooperate with the grooves 221 to clamp the fixed-point optical cable 1 into the fixed-point fixture 2. The length of the fixed-point fixture 2 is 10 - 15 cm.

[0043] AsFigure 4 As shown, the strain distribution curve in the figure is the result tested by the distributed optical fiber strain demodulation instrument. In the figure, a 40-cm-wide block drop is used to simulate different block drop heights. The figure shows that with the occurrence of the block drop, the strain distribution of the fixed-point optical cable 1 in the block drop area shows a trend of being larger at both sides and smaller in the middle, while where there is no block drop, the strain does not change significantly (the section from 4.5 m to 6 m in the figure). Among them, the width of the strain drop area is the same as the width of the block drop (the section from 6.7 m to 7.1 m in the figure). By observing the strain curve distribution of the distributed strain demodulation instrument, the identification and monitoring of the block drop event in the water conveyance tunnel can be realized, accurately guiding the maintenance and ensuring the structural safety of the tunnel.

[0044] An installation method of a tunnel block drop identification and monitoring device based on optical fiber sensing technology provided by the present utility model includes the following steps:

[0045] S1 The fixed-point optical cable 1 is clamped into the fixed-point fixture 2 through the corresponding and mutually cooperating anchor fixing point member 12 on the fixed-point optical cable 1 and the card slot 22 on the fixed-point fixture 2 to form a fixed-point monitoring assembly;

[0046] S2 The fixed-point fixture 2 is fixed on the top of the tunnel by using a fixing member through the movable slot 23 on the fixed-point fixture 2, and a pre-tension of 20 - 30 kN is given. The next fixed-point fixture 2 is fixed in turn, and this is repeated in a line to complete the layout of all fixed-point monitoring assemblies on the top of the tunnel;

[0047] S3 The end of the fixed-point optical cable 1 is connected to the distributed optical fiber strain demodulation instrument 3. By observing the strain distribution law of the fixed-point optical cable 1, the identification and monitoring of the tunnel block drop can be realized, improving the monitoring efficiency of the tunnel block drop and reducing the monitoring cost;

[0048] The fixing member is preferably a rivet or a bolt.

[0049] An installation method of a tunnel block drop identification and monitoring device based on optical fiber sensing technology provided by the present utility model solves the problem of low efficiency of manual detection of existing tunnel block drops, realizes multi-point and long-distance continuous automatic monitoring of the tunnel structure, avoids the possibility of missed detection and missed measurement, improves the accuracy and comprehensiveness of monitoring, and provides reliable monitoring data.

[0050] It can be understood that the present utility model is described by means of some embodiments. Those skilled in the art will know that, without departing from the spirit and scope of the present utility model, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all changes or equivalent substitutions that fall within the scope of the claims of this application. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A tunnel block falling identification and monitoring device based on optical fiber sensing technology, characterized in that: include: A fixed-point monitoring component is continuously arranged at a fixed point and connected to the top of the tunnel. The fixed-point monitoring component includes: a fixed-point optical cable and a plurality of fixed-point clamps. The fixed-point optical cable is connected to the fixed-point clamp, and the end of the fixed-point optical cable is connected to a distributed optical fiber strain demodulator to realize the identification and monitoring of falling blocks in the tunnel.

2. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 1 is characterized in that: The fixed-point optical cable comprises: a sensing optical cable, on which a plurality of anchor fixing point members are arranged at equal intervals.

3. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 2 is characterized in that: The sensing optical cable is fixed-point coupled to the anchor fixing point component through an epoxy resin coupling layer.

4. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 2 is characterized in that: Each of the anchor fixing point components is formed by splicing two semi-ring structures, and the anchor fixing point components are connected to the sensing optical cable.

5. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 2 is characterized in that: The sensor optical cable comprises: an optical fiber, a coating layer is arranged on the surface of the optical fiber, and a sheath is arranged on the outer side of the optical fiber.

6. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 2 is characterized in that: The fixed-point fixture comprises: a base plate, on which movable grooves are correspondingly arranged, and a clamping groove is further arranged on the base plate between the movable grooves, and the inner wall of the clamping groove is provided with a plurality of grooves.

7. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 6 is characterized in that: A plurality of transverse ribs are arranged on the outer side wall of the anchor fixing point member, and the transverse ribs correspond to the grooves and cooperate with each other to clamp the fixed-point optical cable into the fixed-point fixture.

8. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 1 is characterized in that: The fixed-point optical cable is arranged in a straight line on the top of the tunnel through the fixed-point fixture.

9. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 6 is characterized in that: The card slot is in an arc-shaped structure.

10. The tunnel block falling identification and monitoring device based on optical fiber sensing technology according to claim 6 is characterized in that: The length of the fixed-point fixture is 10-15 cm.

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