Pipeline monitoring device based on fiber bragg grating

Abstract

The utility model discloses a pipeline monitoring device based on a fiber bragg grating. The pipeline monitoring device comprises a plurality of fiber bragg grating static leveling gauges, a plurality of pipeline fixing structures and an automatic monitoring device, the plurality of fiber bragg grating static force level gauges are arranged in the soil body, the plurality of fiber bragg grating static force level gauges are sequentially connected in series through liquid passing pipes, the lower sides of the fiber bragg grating static force level gauges are connected with pipelines in the soil body through connecting pieces and pipeline fixing structures, and the automatic monitoring device is connected with the fiber bragg grating static force level gauges; the pipeline fixing structure comprises a first hoop, a second hoop and fasteners, the first hoop and the second hoop are fastened on the upper side and the lower side outside a pipeline in a surrounding mode through the fasteners, and the connecting piece is connected with the outer wall face of the first hoop and the fiber bragg grating static leveling instrument. According to the pipeline monitoring device, automatic real-time monitoring of pipeline displacement is achieved, the monitoring frequency and efficiency can be improved, and the automatic monitoring device can stably work in various severe environments and is high in adaptability to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic monitoring, in particular to a pipeline monitoring device based on optical fiber grating. Background Art

[0002] Shield construction technology is a trenchless construction technology widely used in underground projects such as urban subways, underground pipelines, and tunnels. It uses a shield machine to dig underground and lay pipe segments to form a tunnel structure. Shield tunnel construction may disturb the surrounding soil, which may cause displacement and damage to underground pipelines. Underground pipelines are an important part of urban infrastructure, including water supply, drainage, gas, electricity, and communications. Protecting these pipelines from construction is crucial to maintaining the normal operation of the city. Monitoring the status of pipelines helps to detect potential safety problems in a timely manner and avoid construction accidents. By monitoring the status of pipelines, construction teams can better plan construction schedules and reduce construction interruptions caused by pipeline problems. In short, monitoring underground pipelines during shield tunnel construction is an important measure to ensure safety, protect urban infrastructure, improve construction efficiency, ensure construction quality, and promote technological innovation.

[0003] Existing pipeline monitoring methods are mostly manual monitoring, with low monitoring frequency and efficiency, high manual workload and monitoring costs. Not only can abnormal conditions of pipelines not be discovered in a timely manner, but manual monitoring also has poor adaptability to the environment and cannot work stably in various harsh environments. Utility Model Content

[0004] The utility model provides a pipeline monitoring device based on optical fiber grating to overcome the above problems.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A pipeline monitoring device based on fiber grating includes a plurality of fiber grating static level gauges, a plurality of pipeline fixing structures and an automatic monitoring device;

[0007] A plurality of the fiber grating static levels are arranged in the soil, and the plurality of the fiber grating static levels are sequentially connected in series through a liquid pipe, and the lower side of each of the fiber grating static levels is connected to each pipeline in the soil through a connector and a pipeline fixing structure, and the automatic monitoring device is connected to the fiber grating static level to monitor the displacement data of the pipeline in real time by monitoring the wavelength of reflected light of the fiber grating static level;

[0008] The pipeline fixing structure includes a first clamp, a second clamp and a fastener. The first clamp and the second clamp are respectively clamped and fastened on the upper and lower sides outside the pipeline through the fastener. The lower end of the connecting piece is fixedly connected to the outer wall surface of the first clamp, and the upper end of the connecting piece is connected to the connecting end on the lower side of the fiber grating static level.

[0009] Furthermore, the first clamp and the second clamp have the same structure, both including an annular portion and connecting portions arranged on both sides of the annular portion. The fasteners pass through the connecting portion of the first clamp and the connecting portion of the second clamp to fix the two together and encircle the upper and lower sides of the outer ring of the pipeline. The outer sides of the first clamp and the second clamp are supported by the soil.

[0010] Furthermore, the automatic monitoring device includes a box, a fiber grating demodulator, a wireless transmission module, a battery and a wireless transmission antenna;

[0011] The fiber grating demodulator, wireless transmission module and battery are installed in the box, the wireless transmission antenna is arranged on the box, the fiber grating demodulator is connected to the fiber grating static level and the wireless transmission module through cables respectively, the wireless transmission module is connected to the wireless transmission antenna through cables, and the battery is used to provide power for the fiber grating demodulator and the wireless transmission module.

[0012] Furthermore, it also includes a liquid storage tank, and the fiber grating static level far away from the automatic monitoring device is connected to the liquid storage tank through a liquid pipe. A groove is dug in the soil body, and the liquid pipe is buried in the groove.

[0013] Furthermore, the liquid passage tube is connected to the liquid passage tube interface on the fiber optic Bragg grating static level through a threaded connector.

[0014] Furthermore, the connecting member is a steel bar, the lower side of the steel bar is welded to the outer wall of the first clamp arranged on the upper side of the pipeline, and the upper side of the steel bar is detachably connected to the connecting end of the lower side of the fiber grating static level.

[0015] Furthermore, it also includes a solar panel, and the solar panel is electrically connected to the battery through a cable.

[0016] Furthermore, a protective cover is provided on the upper side of the fiber grating static level on the soil body.

[0017] The beneficial effects of the utility model are:

[0018] The utility model discloses a pipeline monitoring device based on fiber grating, which accurately monitors the minute displacement changes of the pipeline through the fiber grating static level and the automatic monitoring device, and realizes the automatic real-time monitoring of the pipeline displacement. The pipeline monitoring device reduces the manual workload and the monitoring cost, can improve the monitoring frequency and efficiency, can timely discover the abnormal situation of the pipeline, and the automatic monitoring device has strong adaptability to the environment and can work stably in various harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic structural diagram of a pipeline monitoring device based on fiber grating disclosed in an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a fiber Bragg grating static level meter of a pipeline monitoring device based on a fiber Bragg grating disclosed in an embodiment of the utility model;

[0022] Figure 3 It is a structural schematic diagram of a pipeline fixing device of a pipeline monitoring device based on fiber grating disclosed in an embodiment of the utility model;

[0023] Figure 4 It is a schematic diagram of the structure of an automatic monitoring pipeline monitoring device based on fiber grating disclosed in an embodiment of the utility model;

[0024] Figure 5 The present invention is a schematic structural diagram of a solar panel of a pipeline monitoring device based on fiber grating disclosed in an embodiment of the present utility model.

[0025] In the figure:

[0026] 1. Fiber Bragg Grating Static Level; 11. Connection End; 12. Liquid Pipe Interface;

[0027] 2. Pipeline fixing structure; 21. First clamp; 22. Second clamp; 23. Fastener; 24. Ring portion; 25. Connecting portion;

[0028] 3. Automatic monitoring device; 31. Box; 32. Fiber Bragg grating demodulator; 33. Wireless transmission module; 34. Battery; 35. Wireless transmission antenna;

[0029] 4. Soil;

[0030] 5. Liquid pipe;

[0031] 6. Connectors;

[0032] 7. Pipeline;

[0033] 8. Liquid storage tank;

[0034] 9. Solar panels;

[0035] 10. Protective cover;

[0036] 13. Cables. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] like Figure 1 The figure shows a pipeline monitoring device based on fiber Bragg grating provided in this embodiment, which includes a plurality of fiber Bragg grating static level gauges 1, a plurality of pipeline fixing structures 2 and an automatic monitoring device 3;

[0039] A plurality of the fiber grating static levels are arranged in the soil body 4, and the plurality of the fiber grating static levels are sequentially connected in series through the liquid pipe 5, and the lower side of each of the fiber grating static levels is connected to each pipeline in the soil body through the connector 6 and the pipeline fixing structure, and the automatic monitoring device is connected to the fiber grating static level to monitor the displacement data of the pipeline 7 in real time by monitoring the reflected light wavelength of the fiber grating static level;

[0040] The pipeline fixing structure 2 includes a first clamp 21, a second clamp 22 and a fastener 23, wherein the first clamp and the second clamp are respectively clamped and fastened to the upper and lower sides of the outside of the pipeline by the fasteners, the lower end of the connector is fixedly connected to the outer wall of the first clamp, and the upper end of the connector is connected to the connecting end 11 on the lower side of the fiber grating static level; the first clamp and the second clamp are respectively clamped to the outside of the pipeline from the upper and lower sides and are locked and connected by bolts and nuts, which can fit the pipeline surface tightly and provide a stable fixing effect, thereby ensuring the accuracy of the pipeline displacement monitoring results; the fiber grating static level has the characteristics of high precision, high stability and high reliability, is not affected by electromagnetic interference, and has strong corrosion resistance, pollution resistance and lightning resistance, and can be used under harsh conditions.

[0041] The utility model discloses a pipeline monitoring device based on fiber grating, which accurately monitors the minute displacement changes of the pipeline through the fiber grating static level and the automatic monitoring device, and realizes the automatic real-time monitoring of the pipeline displacement. The pipeline monitoring device reduces the manual workload and the monitoring cost, can improve the monitoring frequency and efficiency, can timely discover the abnormal situation of the pipeline, and the automatic monitoring device has strong adaptability to the environment and can work stably in various harsh environments; the real-time monitoring and early warning mechanism is helpful to discover potential safety problems and avoid the occurrence of construction accidents.

[0042] In a specific embodiment, Figure 3 As shown, the first clamp and the second clamp have the same structure, both including an annular portion 24 and connecting portions 25 arranged on both sides of the annular portion, the fastener 23 passes through the connecting portion of the first clamp and the connecting portion of the second clamp to fix the two and connect them to the upper and lower sides of the outer ring of the pipeline 7, the outer sides of the first clamp and the second clamp are supported by the soil 4, the clamp type pipeline fixing structure adopted by the device, the first clamp and the second clamp respectively embrace the outer side of the pipeline from the upper and lower sides and are locked and connected by fasteners, can fit closely to the pipeline surface, provide a stable fixing effect, compared with welding the steel bars directly to the pipeline, the use of this clamp type will not cause any damage to the pipeline itself, and can ensure uniform stress distribution of the pipeline, thereby ensuring the accuracy of the pipeline displacement monitoring results, the clamp type pipeline fixing structure is easy to install, and the first clamp and the second clamp of different sizes can also be set according to different pipeline diameters, and the clamp type pipeline fixing structure is made of stainless steel, has good corrosion resistance, and is suitable for use under various conditions.

[0043] In a specific embodiment, Figure 4 As shown, the automatic monitoring device 3 includes a box 31, a fiber grating demodulator 32, a wireless transmission module 33, a battery 34 and a wireless transmission antenna 35;

[0044] The fiber grating demodulator, wireless transmission module and battery are installed in the box, the wireless transmission antenna is arranged on the box, the fiber grating demodulator is connected to the fiber grating static level and the wireless transmission module respectively through the cable 13, the wireless transmission module is connected to the wireless transmission antenna through the cable, and the battery is used to provide power for the fiber grating demodulator and the wireless transmission module; the fiber grating static level adopting the monitoring device for pipeline displacement and the processing process are all existing technologies: the output reflected light wave wavelength signal of the fiber grating sensor is collected in real time through the existing data acquisition system, the light wave wavelength signal collected by the data acquisition system is transmitted to the fiber grating demodulator, the fiber grating demodulator processes the received light wave wavelength signal, and converts the light wave wavelength into specific numerical data of the pipeline displacement, and the specific numerical data is transmitted to the computer terminal through the wireless transmission module and the wireless transmission antenna to ensure the security and stability of data transmission and prevent data from being lost or interfered during transmission.

[0045] In a specific embodiment, a liquid storage tank 8 is also included. The fiber grating static level far away from the automatic monitoring device is connected to the liquid storage tank through a liquid pipe. A groove is dug in the soil body, and the liquid pipe is buried in the groove. The liquid storage tank is used to solve the impact of ambient temperature changes on the shrinkage and expansion of liquid in the liquid pipe. When the vertical displacement of the sensor changes, the vertical deflection of the monitoring point is obtained by measuring the hydraulic pressure of the sensor.

[0046] In a specific embodiment, Figure 1 , Figure 2 As shown, the liquid tube 5 is connected to the liquid tube interface 12 on the fiber optic Bragg grating static level 1 through a threaded connector. The threaded connector is an external threaded structure threaded joint installed on the liquid tube interface. The threaded joint is screwed tightly on the liquid tube interface 12 of the fiber optic Bragg grating static level. The connection between the liquid tube and the threaded joint is sealed with glue to prevent the liquid in the liquid tube from seeping out, causing leakage, and avoiding affecting the accuracy of the measurement results of the fiber optic Bragg grating static level.

[0047] In a specific embodiment, the connecting piece is a steel bar, the lower side of the steel bar is welded to the outer wall of the first clamp arranged on the upper side of the pipeline, and the upper side of the steel bar is detachably connected to the connecting end of the lower side of the fiber grating static level. In this embodiment, a steel bar with a diameter of 20 mm is used to connect the fiber grating static level, and the upper end of the steel bar is connected to the threaded structure of the connecting end of the lower side of the fiber grating static level through a threaded structure. When the pipeline undergoes displacement changes, such as settlement or tilt, this displacement change will be transmitted to the fiber grating sensor of the fiber grating static level. When the vertical displacement of the sensor changes, the fiber grating The hydraulic pressure of the static level will change, which will cause the strain or stress of the fiber Bragg grating sensor to change, resulting in a change in the grating period, that is, the period of the refractive index change of the grating. When the grating period changes, the wavelength of the fiber Bragg grating reflected light will also change accordingly. By detecting the change in the wavelength of the reflected light, the strain or stress change to the fiber Bragg grating can be determined. This wavelength change is usually very small and needs to be measured by a high-precision optical demodulator, a fiber Bragg grating demodulator. Based on the relationship between wavelength change and strain, the displacement of the pipeline can be measured. By monitoring the change in wavelength in real time, the displacement of the pipeline can be calculated.

[0048] In a specific embodiment, Figure 1 , Figure 5 As shown, it also includes a solar panel 9, which is electrically connected to the battery through a cable. The solar panel converts solar energy into electrical energy for storage to provide electrical energy for the battery. A controller is installed on the solar panel to ensure that the battery works in a safe charging and discharging state.

[0049] In a specific embodiment, a protective cover plate 10 is provided on the upper side of the fiber Bragg grating static level on the soil body, and the protective manhole cover 7 is used for pressure protection to prevent pedestrians and vehicles on the road from causing damage to the instrument.

[0050] The installation steps of a pipeline monitoring device based on fiber grating disclosed in this embodiment are as follows:

[0051] First, a pair of first clamps and second clamps are installed on the outside of each pipeline on the lower side of the soil, and are fixed to the upper and lower ends of the pipeline by screw connection, and are close to the outer wall of the pipeline. The soil outside the first clamp and the second clamp is filled and compacted, and the top of the steel bar welded at the upper end of the first clamp is connected to the connecting end of the lower side of the fiber grating static level. The fiber grating static level is installed in the installation groove on the lower side of the soil. Each fiber grating static level is connected in series in sequence through a liquid pipe and a nut buried in the groove under the soil, and glue is applied and sealed at the connection between the liquid pipe and the nut. The fiber grating static level on one side is connected to the liquid storage tank through the liquid pipe, and then the fiber grating static level away from the liquid storage tank is electrically connected to the fiber grating demodulator of the automatic monitoring device, and the solar panel is electrically connected to the battery in the box of the automatic monitoring device. The protective cover is installed on the upper side of the soil position corresponding to the fiber grating static level, and the installation of the monitoring device is completed.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A pipeline monitoring device based on fiber grating, characterized in that: It comprises a plurality of fiber grating static level gauges (1), a plurality of pipeline fixing structures (2) and an automatic monitoring device (3); A plurality of the fiber Bragg grating static levels (1) are arranged in the soil body (4), and the plurality of the fiber Bragg grating static levels (1) are sequentially connected in series through a liquid pipe (5), and the lower side of each fiber Bragg grating static level (1) is connected to each pipeline in the soil body through a connecting piece (6) and a pipeline fixing structure (2), and the automatic monitoring device (3) is connected to the fiber Bragg grating static level (1) and is used to monitor the displacement data of the pipeline (7) in real time by monitoring the wavelength of reflected light of the fiber Bragg grating static level (1); The pipeline fixing structure (2) comprises a first clamp (21), a second clamp (22) and a fastener (23); the first clamp (21) and the second clamp (22) are respectively clamped and fastened on the upper and lower sides of the outside of the pipeline by the fastener; the lower end of the connecting piece (6) is fixedly connected to the outer wall surface of the first clamp (21); and the upper end of the connecting piece (6) is connected to the connecting end (11) on the lower side of the fiber grating static level (1).

2. A pipeline monitoring device based on fiber grating according to claim 1, characterized in that: The first clamp (21) and the second clamp (22) have the same structure, both comprising an annular portion (24) and connecting portions (25) arranged on both sides of the annular portion. The fastener (23) passes through the connecting portion of the first clamp (21) and the connecting portion of the second clamp (22) to fix the two and connect them to the upper and lower sides of the outer ring of the pipeline (7). The outer sides of the first clamp (21) and the second clamp (22) are supported by the soil (4).

3. A pipeline monitoring device based on fiber grating according to claim 1, characterized in that: The automatic monitoring device (3) comprises a box (31), a fiber optic Bragg grating demodulator (32), a wireless transmission module (33), a storage battery (34) and a wireless transmission antenna (35); The fiber grating demodulator (32), the wireless transmission module (33), and the storage battery (34) are installed in the box (31); the wireless transmission antenna is arranged on the box (31); the fiber grating demodulator (32) is connected to the fiber grating static level (1) and the wireless transmission module (33) via cables (13), respectively; the wireless transmission module (33) is connected to the wireless transmission antenna via cables; and the storage battery (34) is used to provide power to the fiber grating demodulator (32) and the wireless transmission module (33).

4. The pipeline monitoring device based on fiber grating according to claim 1, characterized in that: It also comprises a liquid storage tank (8), wherein the fiber optic Bragg grating static level (1) which is far away from the automatic monitoring device (3) is connected to the liquid storage tank (8) via a liquid pipe, a groove is dug in the soil body, and the liquid pipe is buried in the groove.

5. The pipeline monitoring device based on fiber grating according to claim 1, characterized in that: The liquid passage tube (5) is connected to the liquid passage tube interface (12) on the fiber optic Bragg grating static level (1) (1) through a threaded connector.

6. The pipeline monitoring device based on fiber grating according to claim 1, characterized in that: The connecting member (6) is a steel bar, the lower side of which is welded to the outer wall of the first clamp (21) provided on the upper side of the pipeline (7), and the upper side of which is detachably connected to the connecting end (11) on the lower side of the fiber optic Bragg grating static level (1).

7. The pipeline monitoring device based on fiber grating according to claim 3 is characterized in that: It also includes a solar panel (9), and the solar panel (9) is electrically connected to the storage battery (34) via a cable.

8. The pipeline monitoring device based on fiber grating according to claim 1, characterized in that: A protective cover plate (10) is provided on the upper side of the fiber optic Bragg grating static level (1) on the soil body (4).

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