Monitoring device for tunnel structure deformation

Abstract

The utility model relates to a tunnel structure deformation monitoring device, and relates to the field of tunnel monitoring technology, the tunnel structure deformation monitoring device comprises a plurality of first supports fixedly installed at the top of a tunnel at intervals according to a set distance, and the two ends of each first support are fixedly connected with first connecting rods respectively; a plurality of second connecting rods are fixedly mounted on the opposite side walls of the tunnel to be detected respectively; strain fiber grating sensors are arranged between the first connecting rod and the second connecting rod which are opposite, and the two ends of the strain fiber grating sensors are fixedly connected with the ends of the first connecting rod and the second connecting rod respectively. The tunnel can be monitored in real time, the tunnel deformation monitoring precision and reliability are improved, and effective guarantee is provided for tunnel safety.

Description

Technical Field

[0001] The present application relates to the field of tunnel monitoring technology, and in particular to a monitoring device for tunnel structure deformation. Background Art

[0002] With the development of society, various tunnels are gradually increasing, and tunnel safety accidents are becoming more frequent. Effectively monitoring the status of tunnels and timely avoiding accidents are of great significance to national security. At the beginning of a tunnel accident, there will inevitably be a large deformation or displacement. Therefore, evaluating the safety status of the tunnel by monitoring the deformation or displacement of the tunnel is a simple, direct and effective method. Usually, the main reason for the deformation of the tunnel is the huge pressure from top to bottom. When the tunnel cannot fully withstand the pressure, it will deform. Although the deformation is small, there may be huge potential dangers.

[0003] In the existing technology, deformation monitoring of tunnel structures mainly relies on manual point-by-point monitoring by relevant personnel. The monitoring is time-consuming and labor-intensive, and the measurement accuracy and reliability are low, making it difficult to ensure tunnel safety. Utility Model Content

[0004] In order to monitor the tunnel in real time, improve the accuracy and reliability of tunnel deformation monitoring, and provide effective protection for tunnel safety, the present application provides a monitoring device for tunnel structure deformation.

[0005] The present application provides a monitoring device for tunnel structure deformation using the following technical solution:

[0006] A monitoring device for tunnel structure deformation, comprising a plurality of first brackets fixedly installed at a set distance on the top of the tunnel, wherein both ends of the first brackets are respectively fixedly connected with first connecting rods, and a plurality of second connecting rods are respectively fixedly installed on opposite side walls of the tunnel to be measured, and the plurality of second connecting rods are respectively opposite to the first connecting rods;

[0007] A strain fiber Bragg grating sensor is disposed between the first connecting rod and the second connecting rod, and two ends of the strain fiber Bragg grating sensor are fixedly connected to the ends of the first connecting rod and the second connecting rod respectively;

[0008] A first optical cable is fixedly installed on the top of the tunnel, an input end of the first optical cable is externally connected to a light source, a plurality of first optical fibers are connected to the first optical cable through an optical fiber fusion splicing package, and output ends of the plurality of first optical fibers are connected to the strain fiber grating sensor;

[0009] A plurality of the first optical fibers are respectively connected to second optical fibers via optical couplers, second optical cables are respectively fixedly installed on the inner walls on both sides of the tunnel, output ends of a plurality of the second optical fibers are connected to the second optical cables via optical fiber fusion splicing packages, output ends of the second optical cables are connected to demodulators, and the demodulators are connected to a control host via transmission optical cables;

[0010] The first optical fiber and the second optical fiber are respectively fixed to the first connecting rod and the second connecting rod through a plurality of cable ties.

[0011] By adopting the above technical solution, in the actual monitoring process, when the tunnel is deformed or the top or side wall of the tunnel settles, the magnitude of the tension caused by the first connecting rod and the second connecting rod on the two ends of the strain fiber grating sensor changes, and the wavelength of the light passing through the strain fiber grating sensor changes. After demodulation by the demodulator, the tunnel structure conditions at various points in the tunnel can be obtained. If the tunnel structure settles or deforms, the deformation of the tunnel structure causes the positions of the first connecting rod and the second connecting rod to change, resulting in changes in the forces at both ends of the strain fiber grating sensor. The operator can promptly discover the deformation of the tunnel structure and determine the location of the deformation of the tunnel structure through the control host, which is more efficient and accurate than monitoring the deformation of the tunnel structure through regular manual inspections.

[0012] Preferably, the strain fiber grating sensor comprises mounting parts located at both ends, and a disc-shaped positioning part is integrally formed on the mounting part;

[0013] The ends of the first connecting rod and the second connecting rod are respectively fixedly connected with mounting seats, the mounting seats are provided with a placement groove matched with the mounting portion, and the bottom of the placement groove is provided with a limiting groove matched with the positioning portion;

[0014] The mounting seat is provided with a hoop, the hoop is provided with an avoidance hole for the positioning part to extend out, one end of the hoop is hingedly mounted on the mounting seat, and the other end of the hoop is fixedly mounted on the mounting seat by screws.

[0015] By adopting the above technical solution, when installing the strain fiber Bragg grating sensor, the operator can quickly fix the mounting parts at both ends of the strain fiber Bragg grating on the first connecting rod and the second connecting rod respectively through the mounting seat, which can improve the convenience of installing the strain fiber Bragg grating sensor. During the detection process, since the positioning part on the mounting part of the strain fiber Bragg grating sensor is located in the limiting groove, the groove wall of the limiting groove can limit the position of the positioning part. When the first connecting rod and the second connecting rod change their positions due to the deformation of the tunnel structure, the force applied to the strain fiber Bragg grating sensor can be changed, which can achieve the technical effect of force transmission and ensure the strain fiber Bragg grating sensor's sensing of the deformation of the tunnel structure.

[0016] Preferably, an optical cable bridge is fixedly installed on the top inner wall of the tunnel along the direction of the tunnel, the first optical cable is fixedly installed in the optical cable bridge, and a plurality of the first brackets are fixedly installed at the bottom of the optical cable bridge at set intervals.

[0017] By adopting the above technical solution, the first optical cable can be installed on the top of the inner wall of the tunnel through the optical cable bridge, and the first bracket installed at the bottom of the optical cable bridge can realize the installation and fixation of the first connecting rod.

[0018] Preferably, a plurality of second brackets are fixedly mounted on the two inner side walls of the tunnel, and a plurality of the second connecting rods are fixedly mounted on the second brackets;

[0019] The second brackets are respectively fixedly mounted with C-shaped fixing members, and the C-shaped fixing members are each provided with a fixing groove adapted to the second optical cable.

[0020] By adopting the above technical solution, the second connecting rod can be fixed by the second bracket, the C-shaped fixing part on the second bracket can fix the position of the second optical cable, and the second optical cable can be fixed to the second bracket by a cable tie, thereby achieving a fixed-point fixing effect for the second optical cable.

[0021] In summary, the present invention provides a monitoring device for tunnel structure deformation, which has at least one of the following beneficial technical effects:

[0022] 1. In the actual monitoring process, when the tunnel is deformed, or the top or side wall of the tunnel settles, the tension caused by the first connecting rod and the second connecting rod on the two ends of the strain fiber Bragg grating sensor changes, and the wavelength of the light passing through the strain fiber Bragg grating sensor changes. After demodulation by the demodulator, the tunnel structure at each point in the tunnel can be obtained. If the tunnel structure settles or deforms, the deformation of the tunnel structure causes the position of the first connecting rod and the second connecting rod to change, resulting in changes in the force on both ends of the strain fiber Bragg grating sensor. The operator can timely discover the deformation of the tunnel structure and determine the location of the deformation of the tunnel structure through the control host, which is more efficient and accurate than monitoring the deformation of the tunnel structure through regular manual inspections;

[0023] 2. When installing the strain fiber Bragg grating sensor, the operator can quickly fix the mounting parts at both ends of the strain fiber Bragg grating on the first connecting rod and the second connecting rod respectively through the mounting seat, which can improve the convenience of installing the strain fiber Bragg grating sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of an embodiment of the present application for demonstrating the overall connection structure of the monitoring device.

[0025] Figure 2 It is a schematic diagram of an embodiment of the present application for demonstrating the installation position of a strain fiber Bragg grating sensor.

[0026] Figure 3 It is a schematic diagram of an embodiment of the present application for demonstrating the connection structure between the strain fiber grating sensor and the mounting base.

[0027] Explanation of the reference numerals: 1. tunnel; 11. first bracket; 12. first connecting rod; 13. second connecting rod; 131. mounting seat; 132. placement groove; 133. limiting groove; 134. clamp; 135. avoidance hole; 14. optical cable tray; 15. second bracket; 16. C-type fixing piece; 2. strain fiber grating sensor; 21. mounting part; 22. positioning part; 3. first optical cable; 31. first optical fiber; 4. second optical cable; 41. second optical fiber; 5. optical fiber fusion package; 6. light source; 7. demodulator; 8. control host. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 This application is described in further detail.

[0029] Example

[0030] The present application embodiment discloses a monitoring device for tunnel structure deformation. Figure 1 and Figure 2 It mainly includes a plurality of first brackets 11 fixedly installed at a set distance on the top of the tunnel 1, and first connecting rods 12 are fixedly connected to both ends of the first bracket 11, and a plurality of second connecting rods 13 are fixedly installed on the opposite side walls of the tunnel 1 to be tested, and the plurality of second connecting rods 13 are opposite to the first connecting rods 12 one by one.

[0031] A strain fiber Bragg grating sensor 2 is disposed between the first connecting rod 12 and the second connecting rod 13 , and two ends of the strain fiber Bragg grating sensor 2 are fixedly connected to the ends of the first connecting rod 12 and the second connecting rod 13 , respectively.

[0032] A first optical cable 3 is fixedly installed on the top of the tunnel 1, the input end of the first optical cable 3 is externally connected to a light source 6, a plurality of first optical fibers 31 are connected to the first optical cable 3 through an optical fiber fusion package 5, and the output ends of the plurality of first optical fibers 31 are connected to the strain fiber grating sensor 2;

[0033] Several of the first optical fibers 31 are connected to second optical fibers 41 through optical couplers, and second optical cables 4 are fixedly installed on the inner walls on both sides of the tunnel 1. The output ends of several of the second optical fibers 41 are connected to the second optical cables 4 through optical fiber fusion packages 5. The output ends of the second optical cables 4 are connected to demodulators 7, and the demodulators 7 are connected to a control host 8 through transmission optical cables. The first optical fibers 31 and the second optical fibers 41 are fixed to the first connecting rod 12 and the second connecting rod 13 through several cable ties.

[0034] In the actual monitoring process, when the tunnel 1 is deformed or the top or side wall of the tunnel 1 settles, the tension caused by the first connecting rod 12 and the second connecting rod 13 on the two ends of the strain fiber grating sensor 2 changes, and the wavelength of the light passing through the strain fiber grating sensor 2 changes. After demodulation by the demodulator 7, the structural conditions of the tunnel 1 at each point in the tunnel 1 can be obtained.

[0035] If the tunnel 1 structure sinks or deforms, the deformation of the tunnel 1 structure causes the positions of the first connecting rod 12 and the second connecting rod 13 to change, resulting in changes in the forces at both ends of the strain fiber grating sensor 2. The operator can promptly discover the deformation of the tunnel 1 structure and determine the position of the deformation of the tunnel 1 structure through the control host 8, which is more efficient and accurate than monitoring the deformation of the tunnel 1 structure through regular manual inspections.

[0036] Reference Figure 3 The strain fiber grating sensor 2 includes mounting parts 21 located at both ends, and a disc-shaped positioning part 22 is integrally formed on the mounting part 21; the ends of the first connecting rod 12 and the second connecting rod 13 are respectively fixedly connected with mounting seats 131, and a placement groove 132 adapted to the mounting part 21 is provided on the mounting seat 131, and a limiting groove 133 adapted to the positioning part 22 is provided at the bottom of the placement groove 132.

[0037] A clamp 134 is provided on the mounting seat 131 , and a avoidance hole 135 is opened on the clamp 134 for the positioning portion 22 to extend out. One end of the clamp 134 is hingedly mounted on the mounting seat 131 , and the other end of the clamp 134 is fixedly mounted on the mounting seat 131 by screws.

[0038] When installing the strain fiber Bragg grating sensor 2, the operator can quickly fix the mounting parts 21 at both ends of the strain fiber Bragg grating on the first connecting rod 12 and the second connecting rod 13 respectively through the mounting seat 131, which can improve the convenience of installing the strain fiber Bragg grating sensor 2. During the detection process, since the positioning part 22 on the mounting part 21 of the strain fiber Bragg grating sensor 2 is located in the limiting groove 133, the groove wall of the limiting groove 133 can limit the position of the positioning part 22. When the first connecting rod 12 and the second connecting rod 13 change their positions due to the deformation of the tunnel 1 structure, the force applied to the strain fiber Bragg grating sensor 2 can be changed, and the technical effect of force transmission can be achieved, which ensures that the strain fiber Bragg grating sensor 2 senses the deformation of the tunnel 1 structure.

[0039] Reference Figure 2 A cable tray 14 is fixedly installed on the top inner wall of the tunnel 1 along the direction of the tunnel 1, the first optical cable 3 is fixedly installed in the cable tray 14, and a plurality of first brackets 11 are fixedly installed at the bottom of the cable tray 14 at set intervals.

[0040] The first optical cable 3 can be installed on the top of the inner wall of the tunnel 1 through the optical cable bridge 14 , and the first bracket 11 installed at the bottom of the optical cable bridge 14 can realize the installation and fixation of the first connecting rod 12 .

[0041] Reference Figure 2 A plurality of second brackets 15 are fixedly mounted on the two inner side walls of the tunnel 1, and a plurality of second connecting rods 13 are fixedly mounted on the second brackets 15; C-shaped fixing members 16 are fixedly mounted on the second brackets 15, and the C-shaped fixing members 16 are provided with fixing grooves adapted to the second optical cables 4.

[0042] The second connecting rod 13 can be fixed by the second bracket 15, the C-shaped fixing piece 16 on the second bracket 15 can fix the position of the second optical cable 4, and the second optical cable 4 can be fixed to the second bracket 15 by a cable tie, so as to achieve a fixed-point fixing effect for the second optical cable 4.

[0043] The implementation principle of a monitoring device for tunnel structure deformation in an embodiment of the present application is as follows: in the actual monitoring process, when the tunnel 1 is deformed or the top or side wall of the tunnel 1 settles, the magnitude of the tension caused by the first connecting rod 12 and the second connecting rod 13 on the two ends of the strain fiber grating sensor 2 changes, and the wavelength of the light passing through the strain fiber grating sensor 2 changes. After demodulation by the demodulator 7, the structural conditions of the tunnel 1 at various points in the tunnel 1 can be obtained. If the tunnel 1 structure settles or deforms, the deformation of the tunnel 1 structure causes the positions of the first connecting rod 12 and the second connecting rod 13 to change, resulting in changes in the forces at the two ends of the strain fiber grating sensor 2. The operator can promptly discover the deformation of the tunnel 1 structure and determine the position of the deformed structure of the tunnel 1 by controlling the host 8, which is more efficient and accurate than monitoring the deformation of the tunnel 1 structure through regular manual inspections.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A monitoring device for tunnel structure deformation, characterized in that: It comprises a plurality of first brackets (11) fixedly installed at a set distance on the top of a tunnel (1), the two ends of the first brackets (11) are respectively fixedly connected with first connecting rods (12), and a plurality of second connecting rods (13) are respectively fixedly installed on opposite side walls of the tunnel (1) to be tested, and the plurality of second connecting rods (13) are respectively opposite to the first connecting rods (12); A strain fiber Bragg grating sensor (2) is disposed between the first connecting rod (12) and the second connecting rod (13) which are opposite to each other, and two ends of the strain fiber Bragg grating sensor (2) are fixedly connected to the ends of the first connecting rod (12) and the second connecting rod (13) respectively; A first optical cable (3) is fixedly installed at the top of the tunnel (1); an input end of the first optical cable (3) is externally connected to a light source (6); a plurality of first optical fibers (31) are connected to the first optical cable (3) via an optical fiber fusion splicing package (5); and output ends of the plurality of first optical fibers (31) are connected to the strain fiber grating sensor (2); A plurality of the first optical fibers (31) are respectively connected to second optical fibers (41) via optical couplers, second optical cables (4) are respectively fixedly installed on the inner walls on both sides of the tunnel (1), the output ends of the plurality of the second optical fibers (41) are connected to the second optical cables (4) via optical fiber fusion splicing packages (5), the output ends of the second optical cables (4) are connected to a demodulator (7), and the demodulator (7) is connected to a control host (8) via a transmission optical cable; The first optical fiber (31) and the second optical fiber (41) are respectively fixed to the first connecting rod (12) and the second connecting rod (13) by means of a plurality of cable ties.

2. A monitoring device for tunnel structure deformation according to claim 1, characterized in that: The strain fiber grating sensor (2) comprises mounting portions (21) located at two ends, and a disc-shaped positioning portion (22) is integrally formed on the mounting portion (21); The ends of the first connecting rod (12) and the second connecting rod (13) are respectively fixedly connected to a mounting seat (131); a placement groove (132) adapted to the mounting portion (21) is provided on the mounting seat (131); a limiting groove (133) adapted to the positioning portion (22) is provided at the bottom of the placement groove (132); The mounting seat (131) is provided with a hoop (134), and the hoop (134) is provided with an avoidance hole (135) for the positioning portion (22) to extend out, one end of the hoop (134) is hingedly mounted on the mounting seat (131), and the other end of the hoop (134) is fixedly mounted on the mounting seat (131) by means of screws.

3. The monitoring device for tunnel structure deformation according to claim 1, characterized in that: An optical cable bridge (14) is fixedly installed on the top inner wall of the tunnel (1) along the direction of the tunnel (1); the first optical cable (3) is fixedly installed in the optical cable bridge (14); and a plurality of the first brackets (11) are fixedly installed at the bottom of the optical cable bridge (14) at set intervals.

4. A monitoring device for tunnel structure deformation according to claim 3, characterized in that: A plurality of second brackets (15) are respectively fixedly mounted on the two inner side walls of the tunnel (1), and a plurality of the second connecting rods (13) are respectively fixedly mounted on the second brackets (15); A C-shaped fixing piece (16) is fixedly mounted on each of the second brackets (15), and each of the C-shaped fixing pieces (16) is provided with a fixing groove adapted to the second optical cable (4).

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