Shield tunnel segment splicing crack monitoring device

Abstract

The utility model discloses a shield tunnel segment splicing crack monitoring device which comprises an installation box installed in an installation groove and a fiber bragg grating displacement sensor installed in the installation box. A mounting seat is fixed to the inner side of the mounting box, a U-shaped clamping seat is mounted at the top of the mounting seat, a movable push plate attached to a segment protrusion is slidably mounted on the inner side of the mounting box, an inner sliding groove is formed in the mounting seat, a spring and an inner sliding plate are mounted in the inner sliding groove, and two connecting blocks are symmetrically fixed to the top of the inner sliding plate. According to the utility model, the shield tunnel segment splicing crack monitoring device in the prior art is improved and optimized, and the mounting seat, the U-shaped clamping seat, the inner chute and other structures are designed on the inner side of the mounting box, so that the fiber grating displacement sensor can be quickly mounted and subsequently dismounted, the dismounting and mounting convenience of the whole monitoring device is improved, and the monitoring efficiency is improved. And the earlier-stage assembly and the later-stage disassembly and maintenance are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield tunnel segment monitoring, and in particular relates to a shield tunnel segment splicing crack monitoring device. Background Art

[0002] When shield tunnel segments are spliced, a monitoring device is required to monitor cracks in the segments in real time, thereby determining whether the segments are properly spliced. This monitoring device is a common fiber Bragg grating displacement sensor, also known as a grating contact displacement sensor. For example, the existing patent with publication number CN116989680B discloses a "fiber Bragg grating monitoring device and method for joints during shield segment assembly, comprising a displacement data transmission portion and a displacement data measurement portion; the displacement data transmission portion primarily comprises a shield segment protrusion, cast together with the segment body during shield segment fabrication; the displacement data measurement portion primarily comprises a fiber Bragg grating displacement sensor, a sealed glass cover, and a metal packaging box, wherein the fiber Bragg grating displacement sensor is bolted to the metal packaging box." This application describes a device that uses a fiber Bragg grating displacement sensor to monitor cracks in shield tunnel segments.

[0003] In actual use, the device of the above-mentioned patent that uses fiber grating displacement sensors to monitor cracks in splicing of shield tunnel segments is not easy to disassemble and assemble because the fiber grating displacement sensors are generally installed in the installation box by bolts. This makes it inconvenient to assemble and disassemble the fiber grating displacement sensors in the early stage and to perform maintenance in the later stage, thus reducing the ease of disassembly and assembly of the entire monitoring device. Therefore, the present invention needs to improve and optimize it. Utility Model Content

[0004] The purpose of the utility model is to provide a shield tunnel segment splicing crack monitoring device to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: a shield tunnel segment splicing crack monitoring device, comprising

[0006] An installation box installed in the installation slot, and a fiber Bragg grating displacement sensor installed in the installation box;

[0007] A mounting seat is fixed on the inner side of the mounting box, and a U-shaped clamping seat is installed on the top of the mounting seat. A movable push plate that fits the protrusion of the pipe segment is slidably installed on the inner side of the mounting box. An inner slide groove is opened in the mounting seat, and a spring and an inner slide plate are installed in the inner slide groove. Two connecting blocks are symmetrically fixed on the top of the inner slide plate, and the top of the connecting block passes through the top of the mounting seat and is fixedly connected to the U-shaped clamping seat.

[0008] The fiber Bragg grating displacement sensor includes a sensor body installed between a U-shaped card seat and a mounting seat, a telescopic rod arranged at the front end of the sensor body and in contact with a movable push plate, and positioning blocks fixed on the top of the sensor body and located on both sides of the U-shaped card seat.

[0009] Preferably, two limiting grooves are symmetrically provided on the upper wall of the inner sliding groove, and the top end of the spring is inserted into the limiting groove.

[0010] Preferably, two through holes communicating with the inner slide groove are symmetrically provided on the top of the mounting seat, and the through holes correspond to the connecting blocks.

[0011] Preferably, a strip-shaped shift block is fixed to both side surfaces of the U-shaped holder.

[0012] It also includes a positioning structure, which is arranged between the mounting groove and the mounting box. The positioning structure includes two rubber side seats embedded in the inner walls on both sides of the mounting groove, two positioning protrusions arranged on the side surfaces of the rubber side seats, and positioning grooves opened on the surfaces of both sides of the mounting box and corresponding to the positioning protrusions, and the positioning protrusions are squeezed into the positioning grooves.

[0013] Preferably, the rubber side seat and the positioning protrusion are an integrated structure, and two elliptical cavities are provided inside the rubber side seat, and the positions of the elliptical cavities correspond to the positioning protrusions.

[0014] Compared with the existing technology, the beneficial effects of the present invention are: the present invention improves and optimizes the shield tunnel segment splicing crack monitoring device in the existing technology, and designs a mounting seat, a U-shaped seat and an inner slide groove and other structures on the inner side of the installation box, which can quickly realize the installation and subsequent disassembly of the fiber optic Bragg grating displacement sensor, improve the convenience of disassembly and assembly of the entire monitoring device, facilitate early assembly and later disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 For this utility model Figure 1 A partial enlarged view of area A in the middle;

[0017] Figure 3 This is a side sectional view of the U-shaped holder and mounting base of the utility model;

[0018] Figure 4 For this utility model Figure 2 A partial enlarged view of the middle B area;

[0019] In the figure: 1. Installation box; 11. Movable push plate; 12. Mounting seat; 13. U-shaped holder; 14. Inner slide groove; 15. Spring; 16. Inner slide plate; 17. Connecting block; 18. Positioning groove; 2. Fiber Bragg grating displacement sensor; 21. Sensor body; 22. Telescopic rod; 23. Positioning block; 3. Shield tunnel segment; 31. Mounting groove; 311. Rubber side seat; 312. Positioning protrusion; 32. Segment protrusion. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example

[0022] See also Figures 1 to 4 , is an embodiment of the present utility model, which provides a technical solution: a shield tunnel segment splicing crack monitoring device, comprising

[0023] The mounting box 1 is installed in the mounting groove 31, and the fiber Bragg grating displacement sensor 2 is installed in the mounting box 1;

[0024] The inner side of the mounting box 1 is welded and fixed with a mounting seat 12, and a U-shaped card seat 13 is installed on the top of the mounting seat 12. A movable push plate 11 that fits the pipe segment protrusion 32 is slidably installed on the inner side of the mounting box 1. An inner slide groove 14 is provided in the mounting seat 12, and a spring 15 and an inner slide plate 16 are installed in the inner slide groove 14. Two connecting blocks 17 are symmetrically fixed on the top of the inner slide plate 16, and the top of the connecting block 17 passes through the top of the mounting seat 12 and is fixedly connected to the U-shaped card seat 13. The installation stability of the sensor body 21 is ensured by the U-shaped card seat 13. When the two shield tunnel segments 3 are actually spliced, the mounting box 1 will The internal fiber grating displacement sensor 2 is pre-installed in the installation groove 31. When two shield tunnel segments 3 come into contact during splicing, the segment protrusion 32 at the end of one shield tunnel segment 3 will enter the installation box 1 at the end of the other shield tunnel segment 3, and the segment protrusion 32 will squeeze the movable push plate 11, causing the telescopic rod 22 to be squeezed and contracted, thereby causing the fiber grating inside the sensor body 21 to produce wavelength drift. The change in the central wavelength can be collected after being output by the demodulator, and the measured data can be judged based on the measured data when the two shield tunnel segments 3 are spliced.

[0025] The model of the fiber grating displacement sensor 2 is TS12-R5-485. The fiber grating displacement sensor 2 includes a sensor body 21 installed between the U-shaped base 13 and the mounting base 12, a telescopic rod 22 arranged at the front end of the sensor body 21 and in contact with the movable push plate 11, and positioning blocks 23 fixed to the top of the sensor body 21 and respectively located on both sides of the U-shaped base 13. Under the pressing action of the U-shaped base 13, the stable installation of the sensor body 21 can be achieved. In the later stage, it is only necessary to lift the U-shaped base 13 so that the connecting block 17 moves up with the inner slide 16, and the spring 15 is gradually compressed until the U-shaped base 13 moves up to the top of the positioning block 23, and the sensor body 21 is no longer limited. At this time, the sensor body 21 can be pulled out from between the mounting base 12 and the U-shaped base 13, which is convenient for disassembly and maintenance of the sensor body 21.

[0026] Among them, two limit grooves are symmetrically opened on the upper wall of the inner slide groove 14, and the top end of the spring 15 is inserted into the limit groove to limit the top end of the spring 15 and prevent the spring 15 from running off. The bottom end of the spring 15 is fixed on the top surface of the inner slide plate 16 to further ensure the installation stability of the spring 15.

[0027] The top of the mounting seat 12 is symmetrically provided with two through-holes communicating with the inner slide groove 14 , and the through-holes correspond to the connecting block 17 so as to allow the connecting block 17 to pass through smoothly.

[0028] Among them, a strip-shaped shifting block is welded and fixed on both side surfaces of the U-shaped holder 13 to facilitate subsequent operators to lift the U-shaped holder 13.

[0029] The locating structure is also included, and the locating structure is arranged between the mounting groove 31 and the mounting box 1. The locating structure includes two rubber side seats 311 embedded in the inner walls on both sides of the mounting groove 31, two positioning protrusions 312 arranged on the sides of the rubber side seats 311, and positioning grooves 18 opened on the surfaces of both sides of the mounting box 1 and corresponding to the positioning protrusions 312. The positioning protrusions 312 are squeezed into the positioning grooves 18. After the mounting box 1 is pushed into the mounting groove 31, the positioning protrusions 312 will be squeezed into the positioning grooves 18, thereby limiting the mounting box 1 and ensuring that the mounting box 1 is stably installed in the mounting groove 31.

[0030] Among them, the rubber side seat 311 and the positioning protrusion 312 are an integrated structure. Both are made of rubber material and will undergo elastic deformation when squeezed. Two elliptical cavities are opened inside the rubber side seat 311, and the position of the elliptical cavity corresponds to the positioning protrusion 312, so that the positioning protrusion 312 has sufficient deformation space when squeezed.

[0031] Although embodiments of the present invention have been shown and described (see the detailed description above for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shield tunnel segment splicing crack monitoring device, characterized by: include A mounting box (1) mounted in the mounting groove (31), and a fiber Bragg grating displacement sensor (2) mounted in the mounting box (1); A mounting seat (12) is fixed on the inner side of the mounting box (1), and a U-shaped card seat (13) is installed on the top of the mounting seat (12). A movable push plate (11) that fits the tube segment protrusion (32) is slidably installed on the inner side of the mounting box (1). An inner slide groove (14) is provided in the mounting seat (12), and a spring (15) and an inner slide plate (16) are installed in the inner slide groove (14). Two connecting blocks (17) are symmetrically fixed on the top of the inner slide plate (16), and the top of the connecting block (17) passes through the top of the mounting seat (12) and is fixedly connected to the U-shaped card seat (13); The fiber Bragg grating displacement sensor (2) comprises a sensor body (21) mounted between a U-shaped holder (13) and a mounting seat (12), a telescopic rod (22) arranged at the front end of the sensor body (21) and in contact with the movable push plate (11), and positioning blocks (23) fixed to the top of the sensor body (21) and respectively located on both sides of the U-shaped holder (13).

2. The shield tunnel segment splicing crack monitoring device according to claim 1 is characterized in that: Two limiting grooves are symmetrically formed on the upper wall of the inner sliding groove (14), and the top end of the spring (15) is inserted into the limiting grooves.

3. The shield tunnel segment splicing crack monitoring device according to claim 1, characterized in that: Two through holes communicating with the inner slide groove (14) are symmetrically formed on the top of the mounting seat (12), and the through holes correspond to the connecting block (17).

4. The shield tunnel segment splicing crack monitoring device according to claim 1, characterized in that: A strip-shaped shifting block is fixed on both side surfaces of the U-shaped card seat (13).

5. The shield tunnel segment splicing crack monitoring device according to claim 1, characterized in that: It also includes a positioning structure, which is arranged between the installation groove (31) and the installation box (1).

6. The shield tunnel segment splicing crack monitoring device according to claim 5, characterized in that: The positioning structure comprises two rubber side seats (311) embedded in the inner walls on both sides of the installation groove (31), two positioning protrusions (312) arranged on the sides of the rubber side seats (311), and positioning grooves (18) opened on the surfaces of both sides of the installation box (1) and corresponding to the positioning protrusions (312), wherein the positioning protrusions (312) are squeezed into the positioning grooves (18).

7. The shield tunnel segment splicing crack monitoring device according to claim 6, characterized in that: The rubber side seat (311) and the positioning protrusion (312) are an integrated structure.

8. The shield tunnel segment splicing crack monitoring device according to claim 6, characterized in that: Two elliptical cavities are provided inside the rubber side seat (311), and the positions of the elliptical cavities correspond to the positioning protrusions (312).

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