Strain monitoring device adopting optical fiber sensor

Abstract

The invention provides a strain monitoring device adopting an optical fiber sensor, and belongs to the technical field of optical fiber sensing monitoring, the strain monitoring device adopting the optical fiber sensor comprises a pipe body, an optical fiber sensor and a data acquisition system, a downlink spiral groove and an uplink spiral groove are annularly formed in the side wall of the pipe body, the downlink spiral grooves and the uplink spiral grooves are symmetrically arranged in a staggered mode, the optical fiber sensors are sequentially, continuously and spirally arranged along the downlink spiral grooves and the uplink spiral grooves, the data acquisition system is connected with the optical fiber sensors, strain data can be obtained in real time through signals transmitted by the optical fiber sensors, and the optical fiber sensors are distributed optical fiber sensors. And the data acquisition system is a distributed optical fiber sensing system. By adopting the optical fiber sensing technology, the optical fiber of the optical fiber sensor is spirally wound on the pipe body, and the pipe body is inserted into the to-be-monitored area, so that real-time monitoring is realized, the labor cost is reduced, a slope body with a relatively deep sliding interface can be monitored, and the monitoring effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber sensing monitoring, and particularly relates to a strain monitoring device using an optical fiber sensor. Background Art

[0002] In areas where geological disasters occur frequently, transportation infrastructure such as railways and highways is often threatened by geological disasters such as landslides. Therefore, it is necessary to monitor the slope deformation and analyze the data in areas prone to geological disasters, so as to effectively predict the landslide trend, give early warnings, and ensure the safe operation of transportation infrastructure.

[0003] In the prior art, the monitoring means for slopes generally use theodolites, rangefinders, etc. for measurement, which often requires a large amount of manpower and material resources, and the monitoring cost is relatively high. In addition, it fails to consider that in a slope body with a relatively deep sliding interface, the slope surface is very likely to be displaced as a whole during the early sliding, but there is no large deformation at the place far from the crack on the slope surface, and it is very likely that the slope body is sliding cannot be detected within a small range, and thus early warnings cannot be given, the monitoring effect is poor, and the detection equipment is prone to looseness and displacement due to external forces during the monitoring process. Since there are a large number of people and vehicles passing through some slope areas to be monitored, such as mine tunnels and mountain highway construction sections, during the monitoring of these slope areas, once the vehicle rubs or the personnel accidentally touches, it will cause it to loosen and shift, affecting the accuracy of slope monitoring. Based on this, there is an urgent need to design a technical solution with low monitoring cost and capable of monitoring slope bodies with a relatively deep sliding interface to improve the monitoring effect. Summary of the Invention

[0004] Based on the problems existing in the prior art, the present invention proposes a strain monitoring device using an optical fiber sensor, which is suitable for monitoring slope collapses or landslides.

[0005] To achieve the above object, the present invention adopts the following technical solution: A strain monitoring device using an optical fiber sensor, comprising a tube body, an optical fiber sensor, and a data acquisition system. The side wall of the tube body is provided with a downward spiral groove and an upward spiral groove, and the downward spiral groove and the upward spiral groove are arranged in an alternating and symmetrical manner. The optical fiber sensor is continuously spirally arranged along the downward spiral groove and the upward spiral groove in sequence. The data acquisition system is connected to the optical fiber sensor and can obtain strain data in real time through the signals transmitted by the optical fiber sensor. The optical fiber sensor uses a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module.

[0006] Furthermore, both ends of the fiber optic sensor are respectively connected to a light source and a signal processing module. The signal processing module can collect strain data in real time and transmit it to a data processing platform. The data processing platform can establish a mapping relationship between strain and rock mass displacement to realize real-time monitoring and analysis of strain data. The data processing platform is provided with an early warning device that can emit an alarm signal according to the strain data.

[0007] Preferably, connection shells are fixedly connected to both sides of the pipe body. An activity plate is arranged in the inner cavity of the connection shell. An anti-loosening component is fixedly connected to the bottom of the activity plate. The bottom of the anti-loosening component penetrates to the outside of the connection shell. The connection shell can facilitate the installation and fixation of the activity plate, the anti-loosening component and the locking component. The activity plate can control the stable up and down movement of the ground insertion pipe and the fixed pipe.

[0008] Preferably, guiding blocks are fixedly connected to the front side and the rear side of the inner cavity of the connection shell. Guiding grooves matched with the guiding blocks are respectively formed in the front side and the rear side of the activity plate. Ground cones are fixedly connected to the front side and the rear side of the bottom of the connection shell. The guiding blocks and the guiding grooves can limit the activity plate to prevent it from shifting during the movement process. The ground cones can increase the stability of the connection shell after installation and fixation to prevent it from shifting under the influence of external forces during use and affecting the monitoring results of the slope.

[0009] Preferably, the anti-loosening component includes a ground insertion pipe. The top of the ground insertion pipe is fixedly connected to the activity plate. The top of the ground insertion pipe penetrates through the connection shell and is fixedly connected with a pointed cone. Push plates are movably connected to the front side and the rear side of the inner cavity of the ground insertion pipe respectively. Triangular blocks are fixedly connected to the tops of the opposite sides of the two push plates. A tension spring is fixedly connected between the two push plates. A screw rod is arranged between the two triangular blocks. The bottom of the screw rod is fixedly connected with a conical block. The ground insertion pipe can be inserted into the soil layer of the slope in cooperation with the pointed cone. The push plates can swing back and forth. The triangular blocks can cooperate with the conical block to control the use angles of the two push plates. The tension spring can make the two push plates located in the inner cavity of the ground insertion pipe when the triangular blocks are not extruded. The screw rod can control the use height of the conical block.

[0010] Preferably, a fixed pipe is fixedly connected to the top of the activity plate. The top of the fixed pipe penetrates to the outside of the connection shell. The top of the screw rod penetrates into the inner cavity of the fixed pipe. A threaded sleeve is threadedly connected to the surface of the screw rod. Both sides of the threaded sleeve are fixedly connected to the inner wall of the fixed pipe. The fixed pipe can facilitate the staff to use tools to control the use height of the activity plate and the ground insertion pipe, hammer the ground insertion pipe into the soil layer of the slope, and install and fix the pipe body to prevent it from loosening under the influence of external forces. The threaded sleeve can cooperate with the screw rod to control the use height of the conical block.

[0011] Preferably, an internal hexagonal head is fixedly connected to the top of the screw rod. Limiting cones are fixedly connected to the opposite sides of the two push plates. Moving openings are formed in the front and rear sides of the ground insertion tube. The internal hexagonal head can facilitate the operator to use a hexagonal wrench to rotate the screw rod, so that it cooperates with the threaded sleeve to control the conical block to extrude the inclined surface of the triangular block, thereby controlling the use angle of the two push plates to change. The moving openings can facilitate the push plates to move out of the inner cavity of the ground insertion tube.

[0012] Preferably, an installation shell and a locking assembly are respectively fixedly connected to the side of the connection shell away from the tube body. A fixed locking hole is formed in the surface of the installation shell. The installation shell can cooperate with the installation disk and the locking block fixed on its surface to connect the two tube bodies, so that it can monitor different types of slopes in complex environments and terrains. The fixed locking hole can cooperate with the locking block to stably connect the installation shell and the installation disk.

[0013] Preferably, the locking assembly includes a threaded column. The left side of the threaded column is fixedly connected to the connection shell. An installation disk is fixedly connected to the right side of the threaded column. A locking block is fixedly connected to the surface of the installation disk. A rotating sleeve is threadedly connected to the surface of the threaded column. A movable ring is movably connected to the right side of the rotating sleeve. The threaded column can install and fix the installation disk. The rotating sleeve can cooperate with the thread on the surface of the threaded column to control the use position of the movable ring. The movable ring can control the push rod to move left and right.

[0014] Preferably, a top plate is arranged in the inner cavity of the installation disk. Push rods are fixedly connected to the top and bottom of the left side of the top plate. The left sides of the push rods penetrate through the installation disk and are fixedly connected to the movable ring. The push rods can cooperate with the movable ring to adjust the use position of the top plate. The top plate can extrude the inner wall of the installation shell, further improving the stability of the connection between the installation disk and the installation shell and preventing the installation disk and the installation shell from becoming loose during use. Anti-slip convex blocks are fixedly connected to the surface of the rotating sleeve. Through holes for cooperating with the push rods are formed in the top and bottom of the left side of the installation disk. A protection pad is fixedly connected to the right side of the top plate. The anti-slip convex blocks can improve the anti-slip effect of the rotating sleeve and prevent the operator from slipping when rotating the rotating sleeve. The through holes can facilitate the push rods to adjust the use position of the top plate. The protection pad can increase the protection effect of the top plate on the inner wall of the installation shell and prevent the top plate from causing extrusion wear to the inner wall of the installation shell.

[0015] Preferably, the radii of the upward spiral groove and the downward spiral groove are both 1 - 5 cm, the spiral pitch of the downward spiral groove is 10 cm, the spiral pitch of the upward spiral groove is the same as that of the downward spiral groove, the pipe body is of a cylindrical structure, the inner diameter of the pipe body is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The fiber optic sensor is arranged in a serpentine structure in the downward spiral groove and the upward spiral groove through epoxy resin. After the downward spiral groove spirally descends from the head end of the pipe body to the tail end of the pipe body, it is connected to the upward spiral groove; the upward spiral groove spirally ascends from the tail end of the pipe body back to the head end of the pipe body, and an anti-corrosion layer is provided on the outer surface of the pipe body.

[0016] Compared with the prior art, the advantages and positive effects of the strain monitoring device using a fiber optic sensor in the present invention are as follows: 1. By adopting fiber optic sensing technology in the present invention, the optical fiber of the fiber optic sensor is spirally wound around the pipe body, and then the pipe body is inserted into the area to be monitored, which can realize real-time monitoring, reduce labor costs; and it can monitor slopes with deeper sliding interfaces, improving the monitoring effect.

[0017] 2. The upward spiral groove and the downward spiral groove opened on the surface of the pipe body in the present invention are used to install the fiber optic sensor, so that the optical fiber will not be damaged during the monitoring of the slope, improving its service life and monitoring accuracy. And by filling the upward spiral groove and the downward spiral groove with epoxy resin, the anti-fracture property and adaptability of the optical fiber of the fiber optic sensor can also be improved, enabling it to monitor different types of slopes in different environments. Moreover, the surface of the pipe body is sprayed with an anti-corrosion layer, improving its corrosion resistance and stability, and giving it a long service life.

[0018] 3. Through the anti-loosening component in the present invention, the pipe body can be stably installed at the monitoring position of the slope, preventing it from being displaced under the influence of external forces, enabling it to accurately monitor the slope. After burying the pipe body at the monitoring position, use a tool to hammer the fixed pipe, insert the ground plug into the deep soil of the slope by using the fixed pipe, then use a hex wrench to rotate the inner hexagon head, control the rotation of the screw through the inner hexagon head, and the screw cooperates with the threaded sleeve to make the conical block squeeze the triangular block, pushing out the two push plates from the inner cavity of the ground plug. By the two expanded push plates, the contact area between the pipe body and the soil layer is increased, preventing it from being displaced and loosened under the influence of external forces, and avoiding affecting the monitoring results of the slope.

[0019] 4. Through the locking component, the present invention can stably connect multiple pipe bodies to each other, improve the monitoring range of the pipe bodies for the slope, and install multiple pipe bodies by means of assembly, which can reduce the occupied space during storage and transportation. Insert the installation disc into the inner cavity of the installation shell, and the locking block cooperates with the fixed locking hole to position and fix the installation disc. Rotate the rotating sleeve to control the movement of the movable ring and the push rod. The movement of the push rod controls the top plate to extrude the inner wall of the installation shell, further increasing the stability of the connection between the installation shell and the installation disc. During disassembly, only need to reverse the rotating sleeve and the installation disc to separate the two pipe bodies from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic perspective view of the strain monitoring device using an optical fiber sensor according to the present invention; Figure 2 Schematic diagram of the pipe body according to the present invention; Figure 3 Side view of the pipe body according to the present invention; Figure 4 Schematic diagram of the optical fiber sensor according to the present invention; Figure 5 Side perspective view of the three-dimensional structure according to the present invention; Figure 6 Cross-sectional view of the installation disc according to the present invention; Figure 7 Cross-sectional view of the connection shell according to the present invention; Figure 8 Cross-sectional view of the ground insertion pipe and the fixed pipe according to the present invention; Figure 9 Schematic diagram of another style of the optical fiber sensor in the embodiment according to the present invention; Figure 10 Schematic diagram of another style of the pipe body and the connection shell in the embodiment according to the present invention; Figure 11 Schematic diagram of the pipe body in another embodiment according to the present invention; Figure 12 Schematic diagram of the optical fiber arrangement in the embodiment according to the present invention; Figure 13 Schematic diagram of the optical fiber arrangement in another embodiment according to the present invention.

[0021] Description of reference numerals in the drawings: 1, pipe body; 2, upward spiral groove; 3, downward spiral groove; 4, fiber optic sensor; 5, connecting shell; 6, movable plate; 7, anti-loosening component; 701, ground plug; 702, pointed cone; 703, push plate; 704, triangular block; 705, tension spring; 706, screw rod; 707, tapered block; 708, fixed pipe; 709, threaded sleeve; 710, hexagon socket head; 711, limiting cone; 8, mounting shell; 9, locking component; 901, threaded post; 902, mounting plate; 903, locking block; 904, rotating sleeve; 905, movable ring; 906, top plate; 907, push rod; 10, fixed locking hole. Detailed implementation manners

[0022] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0023] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments of the following invention specification.

[0024] The present invention provides a strain monitoring device using a fiber optic sensor, which includes a pipe body, a fiber optic sensor and a data acquisition system. The side wall of the pipe body is provided with a downward spiral groove and an upward spiral groove in a staggered and symmetric arrangement. The fiber optic sensor is continuously spirally arranged along the downward spiral groove and the upward spiral groove in sequence. The data acquisition system is connected to the fiber optic sensor and can obtain strain data in real time through the signal transmitted by the fiber optic sensor. The fiber optic sensor adopts a distributed fiber optic sensor, and the data acquisition system is a distributed fiber optic sensing system. The distributed fiber optic sensing system includes a light source and a signal processing module.

[0025] The following will describe a strain monitoring device using an optical fiber sensor according to the present invention in conjunction with the accompanying drawings. The device includes a tube body 1, an optical fiber sensor 4, and a data acquisition system. A downward spiral groove 3 and an upward spiral groove 2 are circumferentially provided on the side wall of the tube body 1. The downward spiral groove 3 and the upward spiral groove 2 are arranged in an alternating and symmetrical manner. The optical fiber sensor 4 is continuously arranged in a spiral shape along the downward spiral groove 3 and the upward spiral groove 2 in sequence. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signals transmitted by the optical fiber sensor 4. The optical fiber sensor 4 uses a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module. The two ends of the optical fiber sensor are respectively connected to the light source and the signal processing module. The signal processing module can collect strain data in real time and transmit it to a data processing platform. The data processing platform can establish a mapping relationship between strain and rock mass displacement to realize real-time monitoring and analysis of strain data. The data processing platform is provided with an early warning device that can emit an alarm signal according to the strain data. The radii of both the upward spiral groove 2 and the downward spiral groove 3 are 1 - 5 cm, the spiral pitch of the downward spiral groove 3 is 10 cm, and the spiral pitch of the upward spiral groove 2 is the same as that of the downward spiral groove 3. The tube body 1 has a cylindrical structure, and the inner diameter of the tube body 1 is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The optical fiber sensor 4 is arranged in a snake-like structure in the downward spiral groove 3 and the upward spiral groove 2 through epoxy resin. After the downward spiral groove 3 spirally descends from the head end of the tube body 1 to the end of the tube body, it is connected to the upward spiral groove 2; the upward spiral groove 2 spirally ascends from the end of the tube body 1 back to the head end of the tube body 1. An anti-corrosion layer is provided on the outer surface of the tube body 1.

[0026] With the above technical solution, the fiber optic sensor 4 is arranged in a serpentine shape continuously and spirally along the downward spiral groove 3 and the upward spiral groove 2. The fiber optic sensor 4 is fixed in the downward spiral groove 3 and the upward spiral groove 2 by slight pressing or bonding to avoid loosening or breaking due to external environmental changes or vibrations. Both ends of the fiber optic sensor 4 are connected to the data acquisition system through connectors to achieve real-time signal transmission. The fiber optic sensor 4 in this embodiment adopts a distributed fiber optic sensor, such as a fiber Bragg grating sensor, a Raman fiber optic sensor, etc. The distributed fiber optic sensor includes an optical fiber. By arranging multiple monitoring points on the optical fiber, distributed monitoring can be realized to collect data at different positions. Both ends of the fiber optic sensor 4 are connected to the light source and the signal processing module of the distributed fiber optic sensing system. The signal processing module can use Brillouin scattering technology to collect strain data in real time and transmit it to the data processing platform. The data processing platform uses mature and known algorithms to analyze the strain signal, establish the mapping relationship between strain and rock mass displacement, and realize the real-time monitoring and accurate analysis of strain data. This arrangement form improves the fracture resistance of the fiber optic sensor 4 and enhances its monitoring accuracy and reliability in complex environments. In some embodiments, the shapes of the downward spiral groove 3 and the upward spiral groove 2 can be designed with different angles, depths and spacings according to actual needs, so that the fiber optic sensor 4 and the optical fiber can better adapt to the stress changes in the geological environment and effectively reduce the risk of fiber optic fracture. The data acquisition system is connected to the fiber optic sensor 4 and can obtain strain data in real time through the signal transmitted by the fiber optic sensor 4. The data processing platform with known structure calculates the degree and trend of strain change in real time according to the collected data, analyzes possible risks or problems. Through the set algorithm, the signal change of the fiber optic sensor 4 can be analyzed in detail to identify potential structural problems or environmental anomalies. When abnormal strain or other dangerous signals are detected, the alarm system will be automatically triggered to send warning messages to relevant personnel by means of sound, text message, email, etc., providing guarantee for taking emergency measures in time.

[0027] In addition, the radius of the upward spiral groove 2 is 1 - 5 cm, the radius of the downward spiral groove 3 is 1 - 5 cm, and the groove depths of the downward spiral groove 3 and the upward spiral groove 2 are both 2 mm. Five turns are designed respectively to ensure that the fiber optic sensor 4 can be stably arranged along the groove. And a sensing point is set every 10 cm to ensure full coverage monitoring. The spiral spacings of both the downward spiral groove 3 and the upward spiral groove 2 are 10 cm. When external factors (such as geological movement, traffic load, etc.) cause the environment where the pipe body 1 is located to deform, the downward spiral groove 3 and the upward spiral groove 2 will undergo slight deformation due to strain. This deformation will affect the optical signal propagation characteristics of the optical fiber of the fiber optic sensor 4 (such as the refractive index change of the optical fiber, optical transmission loss, etc.). By measuring the change of the optical signal in the optical fiber, the strain and pressure changes in the surrounding environment can be monitored in real time.

[0028] Furthermore, the fiber optic sensor 4 is arranged in a serpentine structure in the downward spiral groove 3 and the upward spiral groove 2 through epoxy resin. The arrangement of the fiber optic sensor 4 is in a continuous spiral form, which can ensure that the strain changes under external forces are accurately captured, avoiding monitoring failure caused by the fracture of the fiber optic sensor 4. The fiber optic sensor 4 in this embodiment can select technologies such as fiber Bragg grating or Raman fiber optic sensor 4 to improve the sensitivity and accuracy of strain measurement.

[0029] Preferably, after the downward spiral groove 3 spirally descends from the head end of the pipe body 1 to the tail end of the pipe body 1, it is connected to the upward spiral groove 2. The upward spiral groove 2 spirally ascends from the tail end of the pipe body 1 back to the head end of the pipe body 1. The fiber optic sensor 4 is arranged in a spiral following the trajectories of the downward spiral groove 3 and the upward spiral groove 2, significantly improving the anti-fracture property, adaptability, and monitoring accuracy of the fiber optic sensor 4. Compared with traditional linear fiber optic sensors 4, it can effectively avoid fiber fracture caused by external forces, and is particularly suitable for complex environments such as soil, underground, and areas with frequent geological disasters. In addition, the fiber optic sensor 4 has high sensitivity and high accuracy, can monitor strain changes in real time, provide accurate dynamic data, also supports long-distance and distributed monitoring, adapts to the monitoring needs of large-scale infrastructure. At the same time, due to its strong corrosion resistance and stability, it has a long service life and low maintenance cost.

[0030] In another embodiment, according to the actual requirements and the layout of the fiber optic sensor 4, the inner diameter of the pipe body 1 is adjusted to 5.0 cm to ensure that the fiber optic sensor 4 can be stably laid and there is enough space to avoid fiber damage. The outer diameter of the pipe body 1 is 5.5 cm to improve the overall strength and stability of the pipe body 1, ensuring that the fiber optic sensor 4 is not affected by external impacts during the laying process. The length of the pipe body 1 is designed to be 60 cm to ensure sufficient monitoring space and more sensing nodes, adapting to more complex geological monitoring requirements. The pipe body 1 can be installed in complex environments that need to be monitored, such as underground, bridges, tunnels, etc. The fiber optic sensor 4 can be installed on the surface or underground of the facility by means of burying, fixing brackets, etc. Since the pipe body 1 is designed to be compact and structurally stable, it can adapt to different installation requirements. After installation, it is necessary to regularly check whether the fiber connection is loose, whether the sensing system is working properly, whether the data acquisition is accurate, etc., and perform system calibration at regular intervals to ensure the system accuracy and reliability.

[0031] In another embodiment, the upward spiral groove 2 or the downward spiral groove 3 can be removed. As Figure 9 shown, the fiber optic sensor 4 in cooperation with the upward spiral groove 2 or the downward spiral groove 3 can adopt a single spiral structure provided on the pipe body 1, and the monitoring function of the device of the present invention can also be realized.

[0032] In another embodiment, a connecting shell 5 is separately provided, and a cone is fixed at the other end of the pipe body 1. As Figure 10As shown, the tube body 1 can be vertically inserted into the monitoring pit dug on the slope surface. After backfilling the soil, use tools such as a hammer to hammer and fix the fixed tube 708, so that the ground-inserting tube 701 is inserted into the soil layer. Then, use a hexagonal wrench to cooperate with the hexagonal head 710 to control the rotation of the screw 706, so that the two push plates 703 inside the ground-inserting tube 701 are unfolded to limit and fix the tube body 1, so that the tube body 1 can also be stably prevented from loosening when installed in a vertical state.

[0033] Adopting the above technical solution, by setting the anti-loosening component 7, the tube body 1 can be stably installed at the monitoring position of the slope, preventing it from being displaced under the influence of external forces, so that it can accurately monitor the slope. After the tube body 1 is buried at the monitoring position, use tools to hammer the fixed tube 708, and use the fixed tube 708 to insert the ground-inserting tube 701 deep into the soil of the slope. Then, use a hexagonal wrench to rotate the hexagonal head 710, and control the rotation of the screw 706 through the hexagonal head 710. The screw 706 cooperates with the threaded sleeve 709 to make the conical block 707 squeeze the triangular block 704, and push the two push plates 703 out of the inner cavity of the ground-inserting tube 701. The contact area between the tube body 1 and the soil layer is increased by the two unfolded push plates 703, preventing it from being displaced and loosened under the influence of external forces, and avoiding affecting the monitoring results of the slope.

[0034] In addition, connection shells 5 are fixedly connected to both sides of the tube body 1. An activity plate 6 is arranged in the inner cavity of the connection shell 5. An anti-loosening component 7 is fixedly connected to the bottom of the activity plate 6. The bottom of the anti-loosening component 7 penetrates to the outside of the connection shell 5. The connection shell 5 can facilitate the installation and fixation of the activity plate 6, the anti-loosening component 7 and the locking component 9. The activity plate 6 can control the smooth up and down movement of the ground-inserting tube 701 and the fixed tube 708. Guide blocks are fixedly connected to the front side and the rear side of the inner cavity of the connection shell 5. Guide grooves that cooperate with the guide blocks are opened on the front side and the rear side of the activity plate 6. Ground cones are fixedly connected to the front side and the rear side of the bottom of the connection shell 5. The guide blocks and the guide grooves can limit the activity plate 6 to prevent it from shifting during the movement process. The ground cones can increase the stability of the connection shell 5 after installation and fixation, preventing it from shifting under the influence of external forces during use and affecting the monitoring results of the slope.

[0035] On the other hand, the anti-loosening component 7 includes a ground insertion tube 701. The top of the ground insertion tube 701 is fixedly connected to the movable plate 6. The top of the ground insertion tube 701 penetrates through the connection shell 5 and is fixedly connected with a tapered cone 702. The front side and the rear side of the inner cavity of the ground insertion tube 701 are both movably connected with push plates 703. The tops of the opposite sides of the two push plates 703 are both fixedly connected with triangular blocks 704. A tension spring 705 is fixedly connected between the two push plates 703. A screw rod 706 is arranged between the two triangular blocks 704. The bottom of the screw rod 706 is fixedly connected with a tapered block 707. The ground insertion tube 701 can be inserted into the soil layer of the slope in cooperation with the tapered cone 702. The push plates 703 can swing back and forth. The triangular blocks 704 can cooperate with the tapered block 707 to control the use angles of the two push plates 703. The tension spring 705 can prevent the two push plates from loosening when the triangular blocks 704 are not squeezed.

[0036] Furthermore, a fixed tube 708 is fixedly connected to the top of the movable plate 6. The top of the fixed tube 708 penetrates to the outside of the connection shell 5. The top of the screw rod 706 penetrates into the inner cavity of the fixed tube 708. A threaded sleeve 709 is threadedly connected to the surface of the screw rod 706. Both sides of the threaded sleeve 709 are fixedly connected to the inner wall of the fixed tube 708. The fixed tube 708 can facilitate the staff to use tools to control the use height of the movable plate 6 and the ground insertion tube 701, hammer the ground insertion tube 701 into the soil layer of the slope, install and fix the pipe body 1, and prevent it from loosening under the influence of external forces. The threaded sleeve 709 can cooperate with the screw rod 706 to control the use height of the tapered block 707. The top of the screw rod 706 is fixedly connected with an internal hexagonal head 710. The opposite sides of the two push plates 703 are both fixedly connected with limit cones 711. Moving openings are formed on the front side and the rear side of the ground insertion tube 701. The internal hexagonal head 710 can facilitate the staff to use a hexagonal wrench to rotate the screw rod 706, so that it cooperates with the threaded sleeve 709 to control the tapered block 707 to squeeze the inclined surface of the triangular block 704, and then control the use angles of the two push plates 703 to change. The moving openings can facilitate the push plates 703 to move out of the inner cavity of the ground insertion tube 701.

[0037] With the above technical solution, by setting the locking component 9, multiple pipe bodies 1 can be stably connected to each other, improving the monitoring range of the pipe bodies 1 for the slope. And the multiple pipe bodies 1 are installed by means of assembly, which can reduce the occupied space during storage and transportation. Insert the installation disk 902 into the inner cavity of the installation shell 8, so that the locking block 903 cooperates with the fixed locking hole 10 to position and fix the installation disk 902. Rotate the rotating sleeve 904 to control the movement of the movable ring 905 and the push rod 907. The movement of the push rod 907 controls the top plate 906 to squeeze the inner wall of the installation shell 8, further increasing the connection stability between the installation shell 8 and the installation disk 902. When disassembling, only need to reverse the rotating sleeve 904 and the installation disk 902 to separate the two pipe bodies 1 from each other.

[0038] In addition, on one side of the connecting shell 5 away from the pipe body 1, an installation shell 8 and a locking component 9 are respectively fixedly connected. A fixed lock hole 10 is formed on the surface of the installation shell 8. The installation shell 8 can cooperate with the installation disk 902 and the locking block 903 fixed on its surface to connect two pipe bodies 1, enabling it to monitor different types of slopes in complex environments and terrains. The fixed lock hole 10 can cooperate with the locking block 903 to firmly connect the installation shell 8 and the installation disk 902. The locking component 9 includes a threaded column 901. The left side of the threaded column 901 is fixedly connected to the connecting shell 5. The right side of the threaded column 901 is fixedly connected to an installation disk 902. A locking block 903 is fixedly connected to the surface of the installation disk 902. A rotating sleeve 904 is threadedly connected to the surface of the threaded column 901. The right side of the rotating sleeve 904 is movably connected to a movable ring 905. The threaded column 901 can install and fix the installation disk 902. The rotating sleeve 904 can control the use position of the movable ring 905 by matching the thread on the surface of the threaded column 901. The movable ring 905 can control the left and right movement of a push rod 907.

[0039] On the other hand, a top plate 906 is arranged in the inner cavity of the installation disk 902. At the top and bottom of the left side of the top plate 906, push rods 907 are respectively fixedly connected. The left sides of the push rods 907 penetrate through the installation disk 902 and are fixedly connected to the movable ring 905. The push rods 907 can cooperate with the movable ring 905 to adjust the use position of the top plate 906. The top plate 906 can extrude the inner wall of the installation shell 8, further improving the stability of the connection between the installation disk 902 and the installation shell 8 and preventing the installation disk 902 and the installation shell 8 from becoming loose during use.

[0040] Furthermore, anti-slip protrusions are fixedly connected to the surface of the rotating sleeve 904. Through holes for cooperating with the push rods 907 are respectively formed at the top and bottom of the left side of the installation disk 902. A protective pad is fixedly connected to the right side of the top plate 906. The anti-slip protrusions can improve the anti-slip effect of the rotating sleeve 904, preventing the staff from slipping when rotating the rotating sleeve 904. The through holes can facilitate the push rods 907 to adjust the use position of the top plate 906. The protective pad can increase the protection effect of the top plate 906 on the inner wall of the installation shell 8, preventing the top plate 906 from causing extrusion wear to the inner wall of the installation shell 8.

[0041] The following further illustrates the strain monitoring device using an optical fiber sensor according to the present invention in combination with specific embodiments.

[0042] Such as Figures 1 - 13As shown in the figure, the present invention provides a strain monitoring device using an optical fiber sensor, which includes a pipe body 1, an optical fiber sensor 4, and a data acquisition system. A downward spiral groove 3 and an upward spiral groove 2 are annularly arranged on the side wall of the pipe body 1. The downward spiral groove 3 and the upward spiral groove 2 are arranged in an alternating and symmetrical manner. The optical fiber sensor 4 is continuously arranged in a spiral shape along the downward spiral groove 3 and the upward spiral groove 2 in sequence. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signal transmitted by the optical fiber sensor 4. The optical fiber sensor 4 uses a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module. The two ends of the optical fiber sensor are respectively connected to the light source and the signal processing module. The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform can establish a mapping relationship between strain and rock mass displacement to realize real-time monitoring and analysis of strain data. The data processing platform is provided with an early warning device that can emit an alarm signal according to the strain data. The radii of the upward spiral groove 2 and the downward spiral groove 3 are both 1 - 5 cm, the spiral pitch of the downward spiral groove 3 is 10 cm, and the spiral pitch of the upward spiral groove 2 is the same as that of the downward spiral groove 3. The pipe body 1 is of a cylindrical structure, and the inner diameter of the pipe body 1 is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The optical fiber sensor 4 is arranged in a snake-like structure in the downward spiral groove 3 and the upward spiral groove 2 through epoxy resin. After the downward spiral groove 3 spirally descends from the head end of the pipe body 1 to the tail end of the pipe body, it is connected to the upward spiral groove 2; the upward spiral groove 2 spirally ascends from the tail end of the pipe body 1 back to the head end of the pipe body 1. The outer surface of the pipe body 1 is provided with an anti-corrosion layer.

[0043] Next, specifically describe the specific settings and functions of its optical fiber sensor 4, data acquisition system, anti-loosening component 7, and locking component 9.

[0044] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown in the figure, a downward spiral groove 3 and an upward spiral groove 2 are annularly arranged on the side wall of the pipe body 1. The downward spiral groove 3 and the upward spiral groove 2 are arranged in an alternating and symmetrical manner. The optical fiber sensor 4 is continuously arranged in a spiral shape along the downward spiral groove 3 and the upward spiral groove 2 in sequence. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signal transmitted by the optical fiber sensor 4. The optical fiber sensor 4 uses a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module. The two ends of the optical fiber sensor are respectively connected to the light source and the signal processing module. The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform can establish a mapping relationship between strain and rock mass displacement to realize real-time monitoring and analysis of strain data. The data processing platform is provided with an early warning device that can emit an alarm signal according to the strain data.

[0045] The overall effect achieved by the entire fiber optic sensor 4 and the data acquisition system is as follows: The optical fiber of the fiber optic sensor 4 is helically wound around the pipe body 1, and then the pipe body 1 is inserted into the area to be monitored, enabling real-time monitoring, reducing labor costs. After the pipe body 1 is inserted into the area to be monitored, it can monitor slopes with deeper sliding interfaces, improving the monitoring effect. The upward spiral groove 2 and the downward spiral groove 3 opened on the surface of the pipe body 1 are used to install the fiber optic sensor 4, so that the optical fiber will not be damaged during the monitoring process of the slope, improving its service life and monitoring accuracy. Moreover, by filling the upward spiral groove 2 and the downward spiral groove 3 with epoxy resin, the fracture resistance and adaptability of the optical fiber of the fiber optic sensor 4 can also be improved, enabling it to monitor different types of slopes in different environments. In addition, the surface of the pipe body 1 is sprayed with an anti-corrosion layer, improving its corrosion resistance and stability, and giving it a long service life. The two ends of the fiber optic sensor 4 are connected to the light source and signal processing module of the distributed fiber optic sensing system. The signal processing module can use Brillouin scattering technology to collect strain data in real time and transmit it to the data processing platform. The data processing platform analyzes the strain signal using mature and known algorithms, establishes the mapping relationship between strain and rock mass displacement, and realizes the real-time monitoring and accurate analysis of strain data.

[0046] As Figure 7 and Figure 8As shown in the figure, connection shells 5 are fixedly connected to both sides of the pipe body 1. An activity plate 6 is arranged in the inner cavity of the connection shell 5. A loosening prevention component 7 is fixedly connected to the bottom of the activity plate 6. The bottom of the loosening prevention component 7 penetrates to the outside of the connection shell 5. The connection shell 5 can facilitate the installation and fixation of the activity plate 6, the loosening prevention component 7 and the locking component 9. The activity plate 6 can control the smooth up and down movement of the ground insertion pipe 701 and the fixed pipe 708. Guide blocks are fixedly connected to the front side and the rear side of the inner cavity of the connection shell 5. Guide grooves cooperating with the guide blocks are formed in the front side and the rear side of the activity plate 6. Ground cones are fixedly connected to the front side and the rear side of the bottom of the connection shell 5. The guide blocks and the guide grooves can limit the activity plate 6 to prevent it from shifting during the movement process. The ground cones can increase the stability of the connection shell 5 after installation and fixation, preventing it from shifting under the influence of external forces during use and affecting the monitoring results of the slope. The loosening prevention component 7 includes a ground insertion pipe 701. The top of the ground insertion pipe 701 is fixedly connected to the activity plate 6. The top of the ground insertion pipe 701 penetrates through the connection shell 5 and is fixedly connected with a pointed cone 702. Push plates 703 are movably connected to the front side and the rear side of the inner cavity of the ground insertion pipe 701. Triangular blocks 704 are fixedly connected to the tops of the opposite sides of the two push plates 703. A tension spring 705 is fixedly connected between the two push plates 703. A screw rod 706 is arranged between the two triangular blocks 704. The bottom of the screw rod 706 is fixedly connected with a tapered block 707. The ground insertion pipe 701 can cooperate with the pointed cone 702 to be inserted into the soil layer of the slope. The push plates 703 can swing back and forth. The triangular blocks 704 can cooperate with the tapered block 707 to control the use angles of the two push plates 703. The tension spring 705 can make the two push plates 703 located in the inner cavity of the ground insertion pipe 701 when the triangular blocks 704 are not squeezed. The screw rod 706 can control the use height of the tapered block 707. A fixed pipe 708 is fixedly connected to the top of the activity plate 6. The top of the fixed pipe 708 penetrates to the outside of the connection shell 5. The top of the screw rod 706 penetrates to the inner cavity of the fixed pipe 708. A threaded sleeve 709 is threadedly connected to the surface of the screw rod 706. Both sides of the threaded sleeve 709 are fixedly connected to the inner wall of the fixed pipe 708. The fixed pipe 708 can facilitate the staff to use tools to control the use height of the activity plate 6 and the ground insertion pipe 701, hammer the ground insertion pipe 701 into the soil layer of the slope, install and fix the pipe body 1, and prevent it from loosening under the influence of external forces. The threaded sleeve 709 can cooperate with the screw rod 706 to control the use height of the tapered block 707. An internal hexagonal head 710 is fixedly connected to the top of the screw rod 706. Limit cones 711 are fixedly connected to the opposite sides of the two push plates 703. Moving openings are formed in the front side and the rear side of the ground insertion pipe 701. The internal hexagonal head 710 can facilitate the staff to use a hexagonal wrench to rotate the screw rod 706, so that it cooperates with the threaded sleeve 709 to control the tapered block 707 to squeeze the inclined surface of the triangular block 704, and control the change of the use angles of the two push plates 703. The moving openings can facilitate the push plates 703 to move out of the inner cavity of the ground insertion pipe 701.

[0047] The effect achieved by the entire anti-loosening component 7 is that the pipe body 1 can be stably installed at the monitoring position of the slope, preventing it from being displaced under the influence of external forces, enabling it to accurately monitor the slope. After the pipe body 1 is buried in the monitoring position, a tool is used to hammer the fixed pipe 708, and the ground insertion pipe 701 is inserted into the soil deep in the slope by the fixed pipe 708. Then, a hex wrench is used to rotate the internal hexagon head 710, and the screw 706 is controlled to rotate through the internal hexagon head 710. The screw 706 cooperates with the threaded sleeve 709 to make the tapered block 707 squeeze the triangular block 704, and the two push plates 703 are pushed out of the inner cavity of the ground insertion pipe 701. The contact area between the pipe body 1 and the soil layer is increased by the two unfolded push plates 703, preventing it from being displaced and loosened under the influence of external forces, and avoiding affecting the monitoring results of the slope.

[0048] Such as Figure 5 and Figure 6As shown in the figure, on one side of the connecting shell 5 away from the pipe body 1, an installation shell 8 and a locking component 9 are respectively fixedly connected. A fixed locking hole 10 is provided on the surface of the installation shell 8. The installation shell 8 can cooperate with the installation disk 902 and the locking block 903 fixed on its surface to connect two pipe bodies 1, enabling it to monitor different types of slopes in complex environments and terrains. The fixed locking hole 10 can cooperate with the locking block 903 to stably connect the installation shell 8 and the installation disk 902. The locking component 9 includes a threaded column 901. The left side of the threaded column 901 is fixedly connected to the connecting shell 5. The right side of the threaded column 901 is fixedly connected to an installation disk 902. A locking block 903 is fixedly connected to the surface of the installation disk 902. A rotating sleeve 904 is threadedly connected to the surface of the threaded column 901. The right side of the rotating sleeve 904 is movably connected to a movable ring 905. The threaded column 901 can install and fix the installation disk 902. The rotating sleeve 904 can control the use position of the movable ring 905 in cooperation with the threads on the surface of the threaded column 901. The movable ring 905 can control the left and right movement of a push rod 907. The inner cavity of the installation disk 902 is provided with a top plate 906. At the top and bottom of the left side of the top plate 906, push rods 907 are fixedly connected. The left side of the push rod 907 penetrates through the installation disk 902 and is fixedly connected to the movable ring 905. The push rod 907 can cooperate with the movable ring 905 to adjust the use position of the top plate 906. The top plate 906 can squeeze the inner wall of the installation shell 8, further improving the stability of the connection between the installation disk 902 and the installation shell 8, and preventing the installation disk 902 and the installation shell 8 from becoming loose during use. Anti-slip bumps are fixedly connected to the surface of the rotating sleeve 904. Through holes for cooperating with the push rod 907 are provided at the top and bottom of the left side of the installation disk 902. A protective pad is fixedly connected to the right side of the top plate 906. The anti-slip bumps can improve the anti-slip effect of the rotating sleeve 904, preventing the staff from slipping when rotating the rotating sleeve 904. The through holes can facilitate the push rod 907 to adjust the use position of the top plate 906. The protective pad can increase the protective effect of the top plate 906 on the inner wall of the installation shell 8, preventing the top plate 906 from causing extrusion wear on the inner wall of the installation shell 8.

[0049] The overall effect achieved by the entire locking component 9 is that it can stably connect multiple pipe bodies 1 to each other, increasing the monitoring range of the pipe bodies 1 for slopes. Moreover, the multiple pipe bodies 1 are installed by means of assembly, which can reduce the occupied space during storage and transportation. Insert the installation disk 902 into the inner cavity of the installation shell 8, and make the locking block 903 cooperate with the fixed locking hole 10 to position and fix the installation disk 902. Rotate the rotating sleeve 904 to control the movement of the movable ring 905 and the push rod 907. The movement of the push rod 907 controls the top plate 906 to squeeze the inner wall of the installation shell 8, further increasing the stability of the connection between the installation shell 8 and the installation disk 902. When disassembling, only need to reverse the rotating sleeve 904 and the installation disk 902 to separate the two pipe bodies 1 from each other.

[0050] The working principle of the strain monitoring device using an optical fiber sensor is as follows: 1. The pipe body 1 is evenly arranged in the slope or support structure area to continuously monitor high-risk areas. Each pipe body 1 is made of a high-strength and corrosion-resistant composite material, with an inner diameter of 5.0 cm, an outer diameter of 5.5 cm, and a length of 60 cm. The optical fiber sensor 4 is fixed in the upward spiral groove 2 and the downward spiral groove 3 of the pipe body 1 by epoxy resin, and is arranged in a "snake-like" manner to ensure uniform distribution throughout the length of the pipe body 1, thereby improving the monitoring accuracy and stability. Both ends of the optical fiber sensor 4 are connected to a distributed optical fiber sensing system, which uses Brillouin scattering technology BOTDA to collect strain data in real time and transmit it to a data processing platform for analysis. The system establishes a mapping relationship between strain and rock mass displacement through a mature algorithm to ensure the accuracy and real-time nature of the monitoring data. When the monitored strain data exceeds the preset threshold, the system will automatically trigger an alarm and notify the mine management personnel by means of text messages, phone calls, and emails, and take emergency measures in a timely manner.

[0051] 2. During the installation process of the pipe body 1, by excavating shallow grooves on the surface of the slope or support structure, the pipe body 1 is placed inside the installation shallow groove, and a tool such as a hammer is used to hammer and fix the fixing pipe 708. The fixing pipe 708 drives the movable plate 6 and the ground insertion pipe 701 to move downward, so that the ground insertion pipe 701 is inserted into the soil layer of the slope or support structure. Subsequently, an Allen wrench is used to rotate the Allen head 710, and the screw rod 706 is controlled to rotate by the Allen head 710. During the rotation of the screw rod 706, it cooperates with the threaded sleeve 709 to control the tapered block 707 to move upward. The tapered block 707 squeezes the inclined surface of the triangular block 704, so that the triangular block 704 controls the two push plates 703 to expand. After the push plates 703 expand, they are inserted into the soil layer to improve the stability of the fixation of the pipe body 1. Part of the soil is backfilled to bury the pipe body 1 in the slope or support structure, enabling it to accurately carry out monitoring work, avoiding displacement and loosening due to external forces, and preventing the impact on the monitoring results of the slope and support structure.

[0052] 3. When it is necessary to monitor the slope structure and support structure of soft soil, in order to avoid the displacement of the arranged pipe body 1 caused by soil sliding and affecting the monitoring results, multiple pipe bodies 1 are connected to form a whole and fixed in the slope to improve the monitoring accuracy of the slope and prevent it from being disturbed. The installation disk 902 and the installation shell 8 cooperate with each other to make the locking block 903 enter the fixing lock hole 10. Subsequently, the rotating sleeve 904 is rotated, and the movable ring 905 and the push rod 907 are controlled to move by the rotating sleeve 904. The movement of the push rod 907 causes the top plate 906 to squeeze the inner wall of the installation shell 8, improving the stability of the connection between the installation shell 8 and the installation disk 902. There is no need to customize extended pipe bodies 1, and the occupied space is small after disassembly, which is convenient for transportation and storage.

[0053] Other embodiments of the present invention will be readily apparent to those skilled in the art upon consideration of the specification and practice of the inventive concept herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include known common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0054] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A strain monitoring device using an optical fiber sensor, comprising a pipe body (1), an optical fiber sensor (4) and a data acquisition system, characterized in that: The tube body (1) is provided with a downward spiral groove (3) and an upward spiral groove (2) on the side wall thereof, the downward spiral groove (3) and the upward spiral groove (2) being arranged in an alternating and symmetrical manner, the optical fiber sensor (4) being arranged in a spiral manner in sequence along the downward spiral groove (3) and the upward spiral groove (2), the data acquisition system being connected to the optical fiber sensor (4) and being able to acquire strain data in real time through a signal transmitted by the optical fiber sensor (4); The optical fiber sensor (4) adopts a distributed optical fiber sensor, the data acquisition system is a distributed optical fiber sensing system, the distributed optical fiber sensing system comprises a light source and a signal processing module, and the two ends of the optical fiber sensor (4) are respectively connected to the light source and the signal processing module.

2. A strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform can establish a mapping relationship between strain and rock displacement to achieve real-time monitoring and analysis of strain data. The data processing platform is equipped with an early warning device that can emit an alarm signal based on the strain data.

3. A strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: Both sides of the tube body (1) are fixedly connected to a connecting shell (5), the inner cavity of the connecting shell (5) is provided with a movable plate (6), the bottom of the movable plate (6) is fixedly connected to an anti-loosening component (7), and the bottom of the anti-loosening component (7) penetrates to the outside of the connecting shell (5).

4. A strain monitoring device using an optical fiber sensor according to claim 3, characterized in that: The front and rear sides of the inner cavity of the connection shell (5) are fixedly connected to guide blocks, the front and rear sides of the movable plate (6) are provided with guide grooves for use with the guide blocks, and the front and rear sides of the bottom of the connection shell (5) are fixedly connected to ground cones.

5. The strain monitoring device using an optical fiber sensor according to claim 3, characterized in that: The anti-loosening assembly (7) comprises a ground plug (701), the top of the ground plug (701) is fixedly connected to the movable plate (6), the top of the ground plug (701) passes through the connecting shell (5) and is fixedly connected to a pointed cone (702), the front and rear sides of the inner cavity of the ground plug (701) are movably connected to push plates (703), the tops of the opposite sides of the two push plates (703) are fixedly connected to triangular blocks (704), a tension spring (705) is fixedly connected between the two push plates (703), a screw rod (706) is arranged between the two triangular blocks (704), and the bottom of the screw rod (706) is fixedly connected to a conical block (707).

6. A strain monitoring device using an optical fiber sensor according to claim 5, characterized in that: The top of the movable plate (6) is fixedly connected to a fixed tube (708), the top of the fixed tube (708) penetrates to the outside of the connecting shell (5), the top of the screw rod (706) penetrates to the inner cavity of the fixed tube (708), the surface of the screw rod (706) is threadedly connected to a threaded sleeve (709), and both sides of the threaded sleeve (709) are fixedly connected to the inner wall of the fixed tube (708).

7. The strain monitoring device using an optical fiber sensor according to claim 5, characterized in that: The top of the screw rod (706) is fixedly connected to a hexagonal head (710), the opposite sides of the two push plates (703) are fixedly connected to limiting cones (711), and the front and rear sides of the ground plug (701) are both provided with movable openings.

8. The strain monitoring device using an optical fiber sensor according to claim 3, characterized in that: The two connection shells (5) are respectively fixedly connected to a mounting shell (8) and a locking assembly (9) on one side away from the tube body (1), and a fixing lock hole (10) is provided on the surface of the mounting shell (8).

9. A strain monitoring device using an optical fiber sensor according to claim 8, characterized in that: The locking assembly (9) comprises a threaded column (901), the left side of the threaded column (901) being fixedly connected to the connection shell (5), the right side of the threaded column (901) being fixedly connected to a mounting plate (902), the surface of the mounting plate (902) being fixedly connected to a locking block (903), the surface of the threaded column (901) being threadedly connected to a rotating sleeve (904), and the right side of the rotating sleeve (904) being movably connected to a movable ring (905).

10. The strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: The radius of the ascending spiral groove (2) and the descending spiral groove (3) are both 1-5 cm, the spiral pitch of the descending spiral groove (3) is 10 cm, the spiral pitch of the ascending spiral groove (2) is the same as the spiral pitch of the descending spiral groove (3), the tube body (1) is a cylindrical structure, and the inner diameter of the tube body (1) is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The optical fiber sensor (4) is arranged in the descending spiral groove (3) and the ascending spiral groove (2) in a serpentine structure through epoxy resin, the descending spiral groove (3) descends from the head end of the tube body (1) to the end of the tube body in a spiral shape, and is connected to the ascending spiral groove (2); the ascending spiral groove (2) ascends from the end of the tube body (1) in a spiral shape back to the head end of the tube body (1), and an anti-corrosion layer is provided on the outer surface of the tube body (1).

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