Underwater shield tunnel health monitoring device based on FBG sensor

Abstract

The utility model relates to the technical field of shield tunnel health monitoring, and particularly discloses an underwater shield tunnel health monitoring device based on an FBG (Fiber Bragg Grating) sensor, which comprises an intelligent host, the FBG sensor, a grating joint measuring sensor assembly, a fiber grating osmotic pressure sensor assembly and a gas sensor assembly, the grating joint measuring sensor assembly is fixedly connected with the top end of the intelligent host through a connecting column, the fiber grating osmotic pressure sensor assembly is arranged above the grating joint measuring sensor assembly, and the fiber grating osmotic pressure sensor assembly is connected with a protective top through a supporting column; one side of the intelligent host is connected with the gas sensor assembly through a cantilever, and the other side of the intelligent host is provided with a sensor connecting assembly which is connected with the FBG sensor through a connecting line or a wireless network. According to the device, the FBG sensor is combined with other types of sensors for cooperative work, comprehensive and accurate health monitoring of the underwater shield tunnel is achieved, and stable operation of the tunnel is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of shield tunnel health monitoring technology, and more specifically, to an underwater shield tunnel health monitoring device based on an FBG sensor. Background Technology

[0002] With the continuous development and utilization of urban underground space, underwater shield tunnels, as an important transportation infrastructure, require paramount safety and stability. Health monitoring systems can monitor the tunnel structure's operational status in real time, promptly identify potential safety hazards, and ensure the long-term reliable operation of the tunnel.

[0003] Fiber Bragg grating (FBG) sensors, with their advantages of electromagnetic interference resistance, high accuracy, small size, and distributed measurement capability, are widely used in the field of underwater shield tunnel health monitoring, effectively monitoring key parameters such as strain, temperature, displacement, and pressure. However, existing FBG sensor-based monitoring devices have shortcomings. For example, in complex tunnel environments, the monitoring of tunnel structural stress and cracks is not comprehensive and accurate enough, making it difficult to comprehensively analyze the impact of related factors on the tunnel structure, thus hindering accurate judgment and decision-making regarding tunnel health. Therefore, developing a device that comprehensively monitors multiple parameters is of significant practical importance. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this invention aims to provide an underwater shield tunnel health monitoring device based on FBG sensors. By using multiple sensors working together and utilizing flexible data connection methods and wireless communication modules, it can achieve comprehensive, accurate, and reliable health monitoring of underwater shield tunnels.

[0005] This utility model discloses an underwater shield tunnel health monitoring device based on an FBG sensor, comprising a smart host and an FBG sensor, and further comprising:

[0006] The grating gap sensor assembly is fixedly connected to the top of the intelligent host via a connecting post;

[0007] A fiber optic grating pressure sensor assembly is disposed above the grating pressure sensor assembly;

[0008] The protective top is fixedly connected to the fiber optic pressure sensor assembly via support columns;

[0009] A cantilever is provided on one side of the intelligent host, and a gas sensor assembly is fixedly connected to the cantilever. A sensor connection assembly is provided on the other side, which is connected to the FBG sensor.

[0010] Preferably, the gas sensor assembly includes a gas sensor, a connecting block, and a base plate, wherein the gas sensor and the base plate are fixedly connected by the connecting block.

[0011] Preferably, the connecting block is placed at an angle, which is a diffusion structure design.

[0012] Preferably, the sensor connection assembly is connected to the FBG sensor via a connection cable or a wireless network.

[0013] Preferably, the FBG sensor includes an FBG strain sensor, an FBG temperature sensor, and an FBG displacement sensor.

[0014] Preferably, the smart host is also equipped with a wireless communication module on its top and data analysis and processing software inside.

[0015] Therefore, this utility model is an underwater shield tunnel health monitoring device based on an FBG sensor using the above-described structure, and its beneficial effects are as follows:

[0016] (1) Multi-parameter precise monitoring: The grating crack sensor, with its high sensitivity, can capture subtle crack changes in the tunnel structure in real time and accurately obtain structural opening and closing data, providing crucial evidence for in-depth analysis of mechanical damage to the tunnel structure. The fiber optic grating pressure sensor, through optical signal transmission, can accurately measure the seepage pressure changes around the tunnel structure and effectively sense the impact of groundwater pressure on the tunnel structure. The two work together to promptly grasp the dynamics of structural deformation, predict potential seepage damage risks, and provide reliable data support for ensuring the long-term stable operation and structural safety of the tunnel.

[0017] (2) High-efficiency gas detection: The gas sensor assembly adopts a diffusion structure design, which is conducive to the rapid diffusion of gas within the assembly, enabling the gas sensor to detect changes in the concentration of harmful gases in the tunnel more timely and accurately.

[0018] (3) Flexible connection method: The sensor connection component can be connected to the FBG sensor via a cable or a wireless network. This flexible connection method fully considers the complex construction and operation environment of underwater shield tunnels. In the event that the cable may be damaged or interfered with, the wireless network connection method can ensure the stable transmission of monitoring data, avoid data interruption or inaccuracy caused by connection problems, and improve the reliability and stability of the monitoring device.

[0019] (4) Convenient data transmission: The intelligent host is equipped with a wireless communication module on top. This design enables the monitoring device to transmit various types of data collected to the remote monitoring center in a timely and convenient manner, allowing staff to monitor the tunnel's health status in real time. Eliminating the need for cumbersome wiring and manual data collection greatly improves the efficiency of monitoring work and provides strong support for tunnel safety management.

[0020] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an underwater shield tunnel health monitoring device based on an FBG sensor according to this utility model;

[0022] Figure 2 This is a front view of a health monitoring device for underwater shield tunnels based on an FBG sensor, according to this utility model.

[0023] Figure 3 This is a schematic diagram of the gas sensor assembly of an underwater shield tunnel health monitoring device based on an FBG sensor, according to this utility model.

[0024] Figure Labels

[0025] 1. Intelligent host; 2. Sensor connection assembly; 3. Protective roof; 4. Fiber optic grating pressure sensor assembly; 5. Fiber optic grating joint sensor assembly; 6. Cantilever; 7. Gas sensor assembly; 71. Gas sensor; 72. Connecting block; 73. Base plate; 8. Connecting column; 9. Wireless communication module; 10. Support column; 11. FBG sensor; 12. Connecting cable. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] like Figure 1-2As shown, this utility model discloses an underwater shield tunnel health monitoring device based on an FBG sensor, which includes a smart host 1 and an FBG sensor 11. A gas sensor assembly 7 is provided on the left side of the smart host 1 and is connected to the smart host 1 via a cantilever 6. A sensor connection assembly 2 is provided on the right side. The FBG sensor 11 is connected to the sensor connection assembly 2 via a connection cable 12 or a wireless network to achieve data communication with the smart host 1.

[0029] FBG sensor 11 includes:

[0030] Strain sensors: By measuring the wavelength shift of reflected light, strain is calculated, thereby monitoring the deformation of tunnel lining, segments, and other structures in real time, providing crucial data support for assessing the stability and safety of tunnel structures.

[0031] Temperature sensor: Utilizes thermal expansion and thermo-optical effects to measure temperature changes inside the tunnel, thereby preventing problems such as concrete cracks and equipment failures caused by abnormal temperatures, and ensuring the safety of the tunnel structure and the normal operation of equipment.

[0032] Displacement sensor: It indirectly calculates the displacement or vibration of tunnel segments and the overall structure by analyzing the strain changes of fiber optic gratings, thereby ensuring the safety of tunnel construction and the stability of operation.

[0033] The number, location, and spacing of FBG strain sensors, FBG temperature sensors, and FBG displacement sensors can be determined according to the design requirements, structural characteristics, and monitoring accuracy requirements of the underwater shield tunnel.

[0034] The top of the intelligent host 1 is connected to the grating gap measuring sensor assembly 5 via the connecting column 8. The fiber optic grating pressure sensor assembly 4 is fixedly connected above the grating gap measuring sensor assembly 5. A protective top 3 is provided on the top of the fiber optic grating pressure sensor assembly 4, which is connected via the support column 10. This can ensure that the fiber optic grating pressure sensor assembly 4 and the grating gap measuring sensor assembly 5 below are protected from the covering of debris and dust, or ensure the normal operation of the sensors in harsh environments.

[0035] The fiber optic grating pressure sensor assembly 4 includes a pressure sensor and a data receiver. The pressure sensor is buried inside the tunnel surrounding rock to monitor the seepage pressure of the tunnel surrounding rock. The data receiver receives the seepage pressure data and transmits the data to the intelligent host 1. The grating crack detection sensor assembly 5 includes a crack detection sensor and a data receiver. The crack detection sensor is buried inside the tunnel surrounding rock to monitor the state of joints or cracks inside the tunnel surrounding rock. The data receiver receives the data and transmits the data to the intelligent host 1.

[0036] The fiber optic grating pressure sensor assembly 4 and the grating joint measurement sensor assembly 5 work together to monitor seepage and joint-related parameters of the underwater shield tunnel structure in a comprehensive and multi-level manner. This helps to detect the potential impact of seepage changes and joint deformation on the tunnel structure in a timely manner, and take protective measures in advance to ensure the stability and safety of the tunnel.

[0037] like Figure 3 As shown, the gas sensor assembly 7 includes a gas sensor 71, a connecting block 72, and a base plate 73. The gas sensor 71 and the base plate 73 are connected by the connecting block 72. The connecting block 72 is placed at an angle and has a diffusion structure design, which can effectively increase the gas flow rate and make the data measured by the gas sensor 71 more accurate.

[0038] At the top of the intelligent host 1, there is also a wireless communication module 9, which is equipped with data analysis and processing software. It performs real-time analysis on the received FBG sensor data, gas sensor data, fiber optic grating pressure sensor data and grating joint measurement sensor data, assesses the safety status of the tunnel structure, and uploads the assessment results to the monitoring center through the wireless communication module 9. The monitoring center monitors and stores the detection data in real time.

[0039] In summary, this utility model provides an underwater shield tunnel health monitoring device based on an FBG sensor, which, by leveraging the precise sensing characteristics of the FBG sensor and combining it with a fiber optic grating pressure sensor assembly, a grating joint sensor assembly, and a gas sensor assembly, achieves comprehensive, accurate, and reliable health monitoring of underwater shield tunnels.

[0040] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An underwater shield tunnel health monitoring device based on FBG sensor, comprising an intelligent host and an FBG sensor, characterized in that, Also include: Grating joint sensor assembly, fixedly connected with the top of the intelligent host through connecting column; Optical fiber grating osmotic pressure sensor assembly, arranged above the grating joint sensor assembly; Protective top, fixedly connected with the optical fiber grating osmotic pressure sensor assembly through support column; A cantilever is arranged on one side of the intelligent host, and a gas sensor assembly is fixedly connected with the cantilever, and a sensor connecting assembly is arranged on the other side and connected with the FBG sensor. 2.The FBG sensor-based device for monitoring the health of an underwater shield tunnel according to claim 1, wherein, The gas sensor assembly comprises a gas sensor, a connecting block and a bottom plate, and the gas sensor and the bottom plate are fixedly connected through the connecting block. 3.The FBG sensor-based device for monitoring the health of an underwater shield tunnel according to claim 2, wherein, The connecting block is placed obliquely and is designed in a diffusion structure. 4.The FBG sensor-based device for monitoring the health of an underwater shield tunnel according to claim 1, wherein, The sensor connecting assembly and the FBG sensor are connected through a connecting line or a wireless network.

5. The FBG sensor based device for health monitoring of underwater shield tunnel according to claim 4, wherein, The FBG sensor comprises an FBG strain sensor, an FBG temperature sensor and an FBG displacement sensor. 6.The FBG sensor based device for health monitoring of underwater shield tunnel according to claim 1, wherein, A wireless communication module is further arranged on the top of the intelligent host, and data analysis processing software is further equipped inside.

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