Pipeline strain monitoring device and pipeline strain monitoring system

Abstract

The utility model discloses a pipeline strain monitoring device and a pipeline strain monitoring system, and relates to the technical field of pipeline monitoring, the pipeline strain monitoring device comprises a lining pipeline, at least one optical fiber, a stress strain acquisition instrument and an industrial personal computer, the lining pipeline is adaptively arranged in an old pipeline; the optical fiber is clamped between the lining pipeline and the old pipeline and is spirally wound on the peripheral wall of the lining pipeline, the inclination angle of the optical fiber is set to be theta, # imgabs0 #, P is the screw pitch of the optical fiber, and D is the diameter of the lining pipeline; the stress-strain acquisition instrument is electrically connected with the optical fiber and is used for acquiring stress-strain data of the optical fiber and generating a monitoring signal; the industrial personal computer is electrically connected with the stress-strain acquisition instrument, converts the monitoring signal into pressure and deformation quantity, and compares the pressure and deformation quantity with the limit deformation value of the lining pipeline to generate a strain monitoring result; therefore, the whole old pipeline can be covered for real-time accurate monitoring, the pipeline safety and the monitoring reliability are improved, and the occurrence rate of pipeline accidents is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline monitoring, and in particular to a pipeline strain monitoring device and a pipeline strain monitoring system. Background Art

[0002] Due to the large-scale construction of domestic pipeline projects in recent years, the imbalance between construction and use and later maintenance has become a practical problem. Therefore, large-scale pipeline later monitoring and maintenance urgently need to be developed and solved. At present, domestic and foreign scholars have simulated and monitored pipeline deformation based on numerical simulation, on-site detection and indoor experiments. The good feasibility of optical fiber technology in pipeline deformation monitoring has been verified through data comparison. However, for the arrangement of pipeline optical fibers, annular arrangement and longitudinal linear arrangement are often used. The annular arrangement can only reflect the strain data within a two-dimensional pipeline section. For strain monitoring of long-distance pipelines, the measurement accuracy of the annular arrangement is poor and the work efficiency is low. When monitoring pipeline deformation in the form of longitudinal linear arrangement, at least two optical fibers need to be arranged outside the pipeline. For pipelines buried underground, their structural deformation trends are different when subjected to different loads. The measured data cannot better simulate the deformation of the actual pipeline. Therefore, these two arrangement forms are not comprehensive in data monitoring, and the detected data have certain limitations. It is impossible to fully monitor the overall actual strain data of the pipeline. Utility Model Content

[0003] The main purpose of the utility model is to provide a pipeline strain monitoring device and a pipeline strain monitoring system which can directly and comprehensively monitor the pipeline strain.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a pipeline strain monitoring device for strain monitoring of old pipelines, and the pipeline strain monitoring device comprises:

[0005] A lined pipe, adapted to be disposed in the old pipe;

[0006] At least one optical fiber is used to be sandwiched between the inner lining pipe and the old pipe, and is spirally wound on the outer peripheral wall of the inner lining pipe, and the inclination angle of the optical fiber is set to θ, and Wherein, P is the pitch of the optical fiber, and D is the diameter of the lining pipe;

[0007] A stress and strain collector, electrically connected to the optical fiber, for collecting stress and strain data of the old pipeline and generating a monitoring signal; and

[0008] The industrial computer is electrically connected to the stress and strain collector and is used to convert the monitoring signal transmitted by the stress and strain collector into pressure and deformation variables, and compare them with the limit deformation value of the lining pipe to generate strain monitoring results.

[0009] Optionally, 10cm≤P≤50cm, and 5°≤θ≤30°.

[0010] Optionally, an outer peripheral wall of the liner pipe is provided with an adhesive layer for bonding with the inner wall of the old pipe.

[0011] Optionally, the material of the bonding layer includes cement-based grouting material.

[0012] Optionally, the outer periphery of the optical fiber is provided with a rubber sleeve.

[0013] Optionally, the pipeline strain monitoring device further comprises two layers of glass fiber cloth, the two layers of glass fiber cloth are bonded to form a bonding sleeve, the optical fiber is housed in the bonding sleeve and is bonded to the outer peripheral wall of the lining pipe.

[0014] Optionally, a flexible film is bonded to a side of the bonding sleeve close to the old pipe, and the material of the flexible film includes polyethylene material.

[0015] Optionally, the two layers of glass fiber cloth are bonded by two-component epoxy resin; and / or,

[0016] The bonding sleeve is bonded to the outer peripheral wall of the liner pipe by using epoxy resin.

[0017] The utility model also provides a pipeline strain monitoring system, the pipeline strain monitoring system comprising:

[0018] Pipeline strain monitoring devices; and,

[0019] An optical fiber calibration device, used to determine the pitch and inclination of the optical fiber in the pipeline strain monitoring device, comprising an experimental optical fiber, an experimental pipeline, a hydraulic servo and a micrometer, wherein the experimental pipeline is used to install the experimental optical fiber, the hydraulic servo is used to pressurize the experimental pipeline installed with the experimental optical fiber to simulate the deformation of the experimental pipeline in the soil layer, and the micrometer is used to monitor the deformation of the experimental pipeline;

[0020] The pipeline strain monitoring device is used for strain monitoring of old pipelines, and includes:

[0021] A lined pipe, adapted to be disposed in the old pipe;

[0022] At least one optical fiber is used to be sandwiched between the inner lining pipe and the old pipe, and is spirally wound on the outer peripheral wall of the inner lining pipe, and the inclination angle of the optical fiber is set to θ, and Wherein, P is the pitch of the optical fiber, and D is the diameter of the lining pipe;

[0023] A stress and strain collector, electrically connected to the optical fiber, for collecting stress and strain data of the old pipeline and generating a monitoring signal; and

[0024] The industrial computer is electrically connected to the stress and strain collector and is used to convert the monitoring signal transmitted by the stress and strain collector into pressure and deformation variables, and compare them with the limit deformation value of the lining pipe to generate strain monitoring results.

[0025] Optionally, the pipeline strain monitoring system further includes a lining pipeline laying device, and the lining pipeline laying device includes:

[0026] An automatic centering component, including a laser centering instrument, is used to monitor whether the central axis of the lining pipe and the central axis of the old pipe coincide when the lining pipe enters the old pipe;

[0027] A flexible protection assembly, including a flexible pad, is disposed on the front end and / or the outer peripheral wall of the liner pipe; and,

[0028] A stable propulsion assembly, including a camera, a speed sensor and a pressure sensor, is arranged in the liner pipe and is used to monitor whether the liner pipe collides and the movement speed of the liner pipe when the liner pipe enters the old pipe.

[0029] In the technical solution of the utility model, the optical fiber has high sensitivity and high resolution, and is supported by the lining pipe and clamped between the lining pipe and the old pipe, so as to realize real-time and accurate monitoring of the stress and strain of the old pipe, and transmit the collected stress and strain data to the industrial computer to obtain the pressure and deformation of the old pipe, so as to predict the structural deformation of the old pipe; and the optical fiber is arranged in a spiral shape, and the inclination angle and pitch of the optical fiber are set. Compared with the traditional method of arranging optical fibers in a ring shape and longitudinal straight line, it can cover the entire old pipe for monitoring, improve pipeline safety and monitoring reliability, help pipeline operating companies to promptly discover problems with the old pipe and perform maintenance, and reduce the incidence of pipeline accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 A cross-sectional view of a portion of the structure of an embodiment of a pipeline strain monitoring device provided by the utility model;

[0032] Figure 2 for Figure 1 A cross-sectional view of some structures in the pipeline strain monitoring device;

[0033] Figure 3 for Figure 1 Schematic diagram of some structures in the pipeline strain monitoring device;

[0034] Figure 4 This is a partial structural schematic diagram of the pipeline strain monitoring system provided by the utility model.

[0035] Description of Figure Numbers:

[0036] Label name Label name 1000 Pipeline Strain Monitoring System 5 Flexible film 100 Pipeline strain monitoring device 200 Old pipes 1 Lined pipes 300 Laser Alignment Tool 2 optical fiber 400 Flexible pad 3 Adhesive layer 500 track 4 Adhesive sleeve

[0037] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0041] Due to the large-scale construction of domestic pipeline projects in recent years, the imbalance between construction and use and later maintenance has become a practical problem. Therefore, large-scale pipeline later monitoring and maintenance urgently need to be developed and solved. At present, domestic and foreign scholars have simulated and monitored pipeline deformation based on numerical simulation, on-site detection and indoor experiments. The good feasibility of optical fiber technology in pipeline deformation monitoring has been verified through data comparison. However, for the arrangement of pipeline optical fibers, annular arrangement and longitudinal linear arrangement are often used. The annular arrangement can only reflect the strain data within a two-dimensional pipeline section. For strain monitoring of long-distance pipelines, the measurement accuracy of the annular arrangement is poor and the work efficiency is low. When monitoring pipeline deformation in the form of longitudinal linear arrangement, at least two optical fibers need to be arranged outside the pipeline. For pipelines buried underground, their structural deformation trends are different when subjected to different loads. The measured data cannot better simulate the deformation of the actual pipeline. Therefore, these two arrangement forms are not comprehensive in data monitoring, and the detected data have certain limitations. It is impossible to fully monitor the overall actual strain data of the pipeline.

[0042] In view of this, the utility model provides a pipeline strain monitoring device 100, Figures 1 to 3 This is an embodiment of a pipeline strain monitoring device 100 provided by the present utility model.

[0043] See also Figures 1 to 3 The pipeline strain monitoring device 100 includes a lining pipeline 1, at least one optical fiber 2, a stress strain collector and an industrial computer. The lining pipeline 1 is used to be adaptively arranged in the old pipeline 200; the optical fiber 2 is used to be clamped between the lining pipeline 1 and the old pipeline 200, and is spirally wound on the outer peripheral wall of the lining pipeline 1. The inclination angle of the optical fiber 2 is set to θ, and Among them, P is the pitch of the optical fiber 2, and D is the diameter of the lining pipe 1; the stress strain collector is electrically connected to the optical fiber 2, and is used to collect the stress strain data of the optical fiber 2 and generate a monitoring signal; the industrial computer is electrically connected to the stress strain collector, and is used to convert the monitoring signal transmitted by the stress strain collector into pressure and deformation, and compare it with the limit deformation value of the lining pipe 1 to generate a strain monitoring result.

[0044] In the technical solution of the utility model, the optical fiber 2 has high sensitivity and high resolution, and is supported by the lining pipe 1 and clamped between the lining pipe 1 and the old pipe 200, so as to realize real-time and accurate monitoring of the stress and strain of the old pipe 200, and transmit the collected stress and strain data to the industrial computer to obtain the pressure and deformation of the old pipe 200, so as to predict the structural deformation of the old pipe 200; and the optical fiber 2 is arranged in a spiral manner, and the inclination angle and pitch of the optical fiber 2 are set. Compared with the traditional method of arranging the optical fiber 2 in a ring shape and a longitudinal straight line, it can cover the entire old pipe 200 for monitoring, improve pipeline safety and monitoring reliability, help pipeline operating companies to promptly discover problems with the old pipe 200 and perform maintenance, and reduce the incidence of pipeline accidents.

[0045] It should be noted that the installation process of the pipeline strain monitoring device 100 is as follows: first, according to the diameter of the old pipeline 200, the optical fiber 2 is arranged on the outer wall of the lining pipe 1 at a certain inclination angle and pitch, and then the lining pipe 1 arranged with the optical fiber 2 is pushed into the old pipeline 200 along the axis of the old pipeline 200 to a preset position, and the optical fiber 2 is electrically connected to the stress strain collector to realize the monitoring of the old pipeline 200.

[0046] It should also be noted that in some embodiments of the present invention, the industrial computer is equipped with a cloud platform professional monitoring software, which converts the data collected by the optical fiber 2 into pressure values ​​and deformation values, and displays them in real time on the display interface of the industrial computer. In addition, the industrial computer is connected to a mobile phone terminal and / or a PC terminal to achieve remote monitoring.

[0047] Furthermore, in some embodiments of the present invention, 10cm≤P≤50cm, and 5°≤θ≤30°; the cost is controlled while ensuring that the optical fiber 2 fully covers the entire old pipeline 200.

[0048] For details, please refer to Figure 1 The outer wall of the lining pipe 1 is provided with an adhesive layer 3 for bonding with the inner wall of the old pipe 200; thus, the lining pipe 1 and the old pipe 200 are connected as a whole through the adhesive layer 3, preventing the lining pipe 1 from moving relative to the old pipe 200, resulting in deviations in the monitoring results of the optical fiber 2 or failure to monitor.

[0049] Furthermore, the material of the bonding layer 3 includes a cement-based grouting material. Furthermore, the specific ratio of the cement-based grouting material can refer to the ratio of 50% cement, 30% fine sand, 15% water, and 5% additives (fluidity enhancer, concrete shrinkage reducer, anti-cracking fiber). This design can enhance the fluidity, filling and low shrinkage of the grouting material, ensure that the slurry flows smoothly in a narrow gap space, and produce lower shrinkage during solidification, thereby reducing the pulling damage to the optical fiber 2. The anti-cracking fiber can also enhance the stability and durability of the slurry.

[0050] Furthermore, the cement-based grouting material is injected between the lining pipe 1 and the old pipe 200 through a grouting machine and covers the optical fiber 2, so that the optical fiber 2, the lining pipe 1 and the old pipe 200 are connected as one.

[0051] Furthermore, when grouting between the lining pipe 1 and the old pipe 200, in order to ensure that the optical fiber 2 is not damaged or displaced by the flow impact of the cement-based grouting material, attention should be paid to the grouting rate to prevent the rate from being too fast. A segmented pressure-controlled grouting method can be designed. Specifically, it can be subdivided into several grouting sections according to the length of the old pipe 200. The specific grouting section length can be set to 2-3 meters. The next grouting is carried out after each section of grouting is completed to avoid a large impact on the optical fiber 2 caused by a one-time long-term grouting. At the same time, a stable grouting pressure and grouting amount need to be maintained during grouting, and the grouting pressure range is 0.1-0.3MPa.

[0052] Specifically, when the optical fiber 2 is installed on the outer wall of the inner lining pipe 1, since the optical fiber 2 is relatively fragile, in order to prevent the optical fiber 2 from being damaged, protective measures can be taken for the optical fiber 2. Therefore, in one embodiment of the utility model, a rubber sleeve is provided on the outer periphery of the optical fiber 2; in this way, the structure of the optical fiber 2 can be protected when the optical fiber 2 is wound.

[0053] Specifically, since the optical fiber 2 is relatively thin, in order to make the optical fiber 2 better fit the outer wall of the inner lining pipe 1, please refer to Figure 1 In one embodiment of the utility model, the old pipeline 200 strain monitoring device 100 also includes two layers of glass fiber cloth, and the two layers of glass fiber cloth are bonded to form an adhesive sleeve 4, and the optical fiber 2 is placed in the adhesive sleeve 4 and bonded to the outer wall of the lining pipe 1; in this way, the optical fiber 2 is inserted into the adhesive sleeve 4, and compared with the optical fiber 2, the contact surface of the adhesive sleeve 4 and the lining pipe 1 is larger, and the connection strength with the lining pipe 1 is greater, thereby expanding the attachment area of ​​the optical fiber 2 on the lining pipe 1 and preventing the optical fiber 2 from being displaced.

[0054] Furthermore, in an embodiment of the utility model, the two layers of the glass fiber cloth are bonded by using a two-component epoxy resin, which has high bonding strength and good durability.

[0055] For details, please refer to Figure 1 The bonding sleeve 4 is bonded to the outer wall of the liner pipe 1 by epoxy resin; the bonding strength is high and the durability is good.

[0056] It should be noted that, in the present invention, the above two technical features can be set either one or both. Specifically, in one embodiment of the present invention, the above two technical features are set simultaneously, that is, the two layers of the glass fiber cloth are bonded with a two-component epoxy resin, and the bonding sleeve 4 is bonded to the outer peripheral wall of the liner pipe 1 with an epoxy resin.

[0057] For details, please refer to Figure 1 In order to protect the optical fiber 2, a flexible film 5 is bonded to the side of the adhesive sleeve 4 close to the old pipe 200, and the material of the flexible film 5 includes polyethylene material; in this way, damage or corrosion of the optical fiber 2 is avoided when the lining pipe 1 is installed.

[0058] For details, please refer to Figure 4 The utility model also provides a pipeline strain monitoring system 1000, including an old pipeline 200 strain monitoring device 100 and an optical fiber 2 calibration device, the optical fiber 2 calibration device is used to determine the pitch and inclination of the optical fiber 2 in the old pipeline 200 strain monitoring device 100, including an experimental optical fiber 2, an experimental pipeline, a hydraulic servo and a micrometer, the experimental pipeline is used to install the experimental optical fiber 2, the hydraulic servo is used to pressurize the experimental pipeline installed with the experimental optical fiber 2 to simulate the stress deformation of the experimental pipeline in the soil layer, and the micrometer is used to monitor the deformation of the experimental pipeline.

[0059] It should be noted that the above-mentioned old pipeline 200 strain monitoring device 100 adopts the old pipeline 200 strain monitoring device 100 as described above, that is, the pipeline strain monitoring system 1000 has all the technical features of all the embodiments of the above-mentioned old pipeline 200 strain monitoring device 100, and also has all the technical effects brought by all the above-mentioned technical features, which will not be repeated here one by one.

[0060] Before being arranged on the outer wall of the lining pipe 1, the optical fiber 2 needs to be calibrated by the optical fiber 2 calibration device to determine more reasonable corresponding parameters of the helix within the given helix pitch range and in combination with the actual situation of the old pipe 200.

[0061] The specific steps of the calibration experiment are as follows: first, according to the length and diameter of the old pipeline 200, experimental groups with different pitches and inclinations are designed, and the optical fiber 2 is laid in the experimental pipeline according to the design data of each experimental group; then the micrometer is installed on the experimental pipeline; then the hydraulic servo is used to reasonably pressurize the surface of the experimental pipeline to simulate the stress and deformation of the old pipeline 200 in the soil layer; furthermore, the data monitored by the micrometer is analyzed and compared with the data monitored by the optical fiber 2, and the design parameters of the experimental group with the highest overlap are selected to set the layout parameters of the optical fiber 2 on the lining pipeline 1, that is, the pitch and inclination of the optical fiber 2.

[0062] For further information, see Figure 4 The pipeline strain monitoring system 1000 also includes a liner pipe laying device, which includes an automatic centering component, a flexible protection component and a stable propulsion component. The automatic centering component includes a laser centering instrument 300, which is used to monitor whether the central axis of the liner pipe 1 and the central axis of the old pipe 200 coincide when the liner pipe 1 enters the old pipe 200; the flexible protection component includes a flexible pad 400, which is arranged at the front end and / or the outer wall of the liner pipe 1; the stable propulsion component includes a camera, a speed sensor and a pressure sensor, which are arranged on the liner pipe 1, and are used to monitor whether the liner pipe 1 collides and the movement speed of the liner pipe 1 when the liner pipe 1 enters the old pipe 200.

[0063] When the liner pipe 1 is installed into the old pipe 200, attention should be paid to the advancement rate and angle maintenance, and the protection of the optical fiber 2 should also be paid attention to. Therefore, the stable advancement rate of the liner pipe 1 is maintained by the stable advancement component, and the automatic centering component is used to ensure that the advancement angle of the liner pipe 1 does not shift when the liner pipe 1 is advanced. At the same time, the optical fiber 2 is protected by the flexible protection component.

[0064] Specifically, the laser centering instrument 300 is used to monitor whether the central axis of the lining pipe 1 and the central axis of the old pipe 200 always remain coincident during the advancement and installation process, so as to avoid friction between the lining pipe 1 and the old pipe 200 and wear of the optical fiber 2; further, the flexible pad 400 is provided to protect the optical fiber 2 to avoid friction and collision of the optical fiber 2 during the advancement of the pipeline; at the same time, the camera and the pressure sensor are provided to monitor whether the lining pipe 1 collides with the old pipe 200, and the advancement speed is monitored in real time by the speed sensor.

[0065] It should be noted that, in an embodiment of the present invention, the camera and the pressure sensor are both arranged at the front end of the liner pipe 1 in the propulsion direction thereof.

[0066] Furthermore, the stable propulsion assembly also includes a track 500, and the lining pipe 1 equipped with the optical fiber 2 is arranged on the track 500, and is stably pushed into the old pipe 200 through the track 500. When the lining pipe 1 enters a preset position, the optical fiber 2, the lining pipe 1, the old pipe 200 and the track 500 are connected as a whole by injecting cement-based grouting material.

[0067] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A pipeline strain monitoring device, used for strain monitoring of old pipelines, characterized in that: The pipeline strain monitoring device comprises: A lined pipe, adapted to be disposed in the old pipe; At least one optical fiber is used to be sandwiched between the inner lining pipe and the old pipe, and is spirally wound on the outer peripheral wall of the inner lining pipe, and the inclination angle of the optical fiber is set to θ, and Wherein, P is the pitch of the optical fiber, and D is the diameter of the lining pipe; A stress and strain collector, electrically connected to the optical fiber, for collecting stress and strain data of the old pipeline and generating a monitoring signal; and The industrial computer is electrically connected to the stress and strain collector and is used to convert the monitoring signal transmitted by the stress and strain collector into pressure and deformation variables, and compare them with the limit deformation value of the lining pipe to generate strain monitoring results.

2. The pipeline strain monitoring device according to claim 1, characterized in that: 10cm≤P≤50cm, and 5°≤θ≤30°.

3. The pipeline strain monitoring device according to claim 1, characterized in that: The outer peripheral wall of the lining pipe is provided with an adhesive layer for bonding with the inner wall of the old pipe.

4. The pipeline strain monitoring device according to claim 3, characterized in that: The material of the bonding layer includes cement-based grouting material.

5. The pipeline strain monitoring device according to claim 1, characterized in that: The outer periphery of the optical fiber is covered with a rubber sleeve.

6. The pipeline strain monitoring device according to claim 1 or 5, characterized in that: The pipeline strain monitoring device also includes two layers of glass fiber cloth, which are bonded to form a bonding sleeve. The optical fiber is placed in the bonding sleeve and is bonded to the outer peripheral wall of the lining pipeline.

7. The pipeline strain monitoring device according to claim 6, characterized in that: A flexible film is bonded to one side of the bonding sleeve close to the old pipe, and the material of the flexible film includes polyethylene material.

8. The pipeline strain monitoring device according to claim 6, characterized in that: The two layers of glass fiber cloth are bonded by two-component epoxy resin; and / or, The bonding sleeve is bonded to the outer peripheral wall of the liner pipe by using epoxy resin.

9. A pipeline strain monitoring system, characterized in that: The pipeline strain monitoring system comprises: The pipeline strain monitoring device according to any one of claims 1 to 8; and The optical fiber calibration device is used to determine the pitch and inclination of the optical fiber in the pipeline strain monitoring device, comprising an experimental optical fiber, an experimental pipeline, a hydraulic servo and a micrometer. The experimental pipeline is used to install the experimental optical fiber. The hydraulic servo is used to pressurize the experimental pipeline installed with the experimental optical fiber to simulate the stress deformation of the experimental pipeline in the soil layer. The micrometer is used to monitor the deformation of the experimental pipeline.

10. The pipeline strain monitoring system according to claim 9, characterized in that: The pipeline strain monitoring system further includes a lining pipeline laying device, and the lining pipeline laying device includes: An automatic centering component, including a laser centering instrument, is used to monitor whether the central axis of the lining pipe and the central axis of the old pipe coincide when the lining pipe enters the old pipe; A flexible protection assembly, including a flexible pad, is disposed on the front end and / or the outer peripheral wall of the liner pipe; and, A stable propulsion assembly, including a camera, a speed sensor and a pressure sensor, is arranged in the liner pipe and is used to monitor whether the liner pipe collides and the movement speed of the liner pipe when the liner pipe enters the old pipe.

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