Distributed optical fiber fixing structure based on tunnel under construction

Abstract

The utility model discloses a distributed optical fiber fixing structure based on a tunnel under construction, which relates to the field of tunnels, and comprises a plurality of fixing parts, the plurality of fixing parts are used for fixing an optical cable on the tunnel, each fixing part comprises a fixing ring and a moving rod, the lower end of each moving rod is provided with a pulley, and the upper end of each moving rod is connected with the corresponding fixing ring; a rotating piece is connected between the fixed ring and the movable rod and enables the fixed ring to rotate on the movable rod. In the monitoring process, the optical cable is preliminarily fixed through the fixing piece, the optical cable is glued through the fixing piece after being fixed, an operator does not need to climb to operate, and the problem that the operator is injured due to the fact that the optical cable falls off in the tunnel construction process is solved.

Description

Technical Field

[0001] The utility model relates to the field of tunnels, in particular to a distributed optical fiber fixing structure based on a tunnel under construction. Background Art

[0002] The measurement of stress changes in the walls of subway tunnels, high-speed tunnels, urban pipe corridors, etc., vibration velocity, and temperature inside the tunnel is related to the operating safety of subways, high-speed vehicles, urban pipe corridor equipment, etc. and the safety of people’s lives and property.

[0003] Strain optical cables serve as both sensors and transmission channels. To monitor the strain of the tunnel body through strain optical cables, the strain optical cables need to be firmly bonded to the tunnel rock wall. Therefore, the construction quality of the strain optical cables directly affects the effect of tunnel body strain monitoring. In existing technologies, optical cables are mainly bonded to the tunnel rock wall through adhesives.

[0004] However, in actual operation, the optical cable needs to be initially fixed before being glued, and then glued by workers individually, which may easily cause degumming, which may easily cause personal injury. Utility Model Content

[0005] One purpose of the utility model is to provide a distributed optical fiber fixing structure based on a tunnel under construction, to fix the optical cable through a fixing module, to monitor the health of the tunnel under construction through a distributed optical fiber stress and strain monitoring system, a wireless three-dimensional micro-displacement monitoring system and a distributed optical fiber temperature monitoring system, and to support the optical cable through a fixing part to avoid personal injury caused by the optical cable falling off after debonding.

[0006] This purpose is achieved by adopting the following technical solutions:

[0007] The distributed optical fiber fixed structure based on the tunnel under construction includes an early warning cloud system, a distributed optical fiber stress and strain monitoring system, a wireless three-dimensional micro-displacement monitoring system and a distributed optical fiber temperature monitoring system. The distributed optical fiber stress and strain monitoring system is used to monitor strain data, the wireless three-dimensional micro-displacement monitoring system is used to monitor displacement data, and the distributed optical fiber temperature monitoring system is used to monitor temperature data; the early warning cloud system is used to obtain strain data, displacement data and temperature data, and obtain health data through strain data, displacement data and temperature data; the monitoring system also includes a fixing module, the fixing module includes a number of fixings, and the several fixings are used to fix the optical cable in an S shape at the tunnel vault position, and the optical cable is set along the tunnel excavation direction, wherein the optical cable includes a number of straight optical cables and a number of curved optical cables, the curved optical cables are located between two adjacent straight optical cables, and the straight optical cables are perpendicular to the tunnel excavation direction. The monitoring system also includes a broken fiber monitoring module, which is used to obtain the location information of the broken fiber and send the location information of the broken fiber to the early warning cloud system.

[0008] Among them, in the distributed optical fiber stress and strain monitoring system, the laser emits coded light pulses along the optical fiber, which act on the optical fiber in three quantum superposition states (transmission state, scattering state and absorption state) and propagate in the optical fiber. When a certain place is disturbed by the external stress field, the optical fiber lattice skin changes, and the curvature of the backscattered signal is proportional to the disturbance within the coherent length. The stress field special decoding and demodulation can obtain any fragment disturbance. Since the speed of light remains unchanged, the measurement result of stress disturbance per meter of optical fiber can be obtained.

[0009] Distributed fiber temperature monitoring technology uses a continuous wave emitted by a laser diode to illuminate the glass core of the optical fiber. When the light wave moves down along the glass core of the optical fiber, it will produce various types of radiation scattering, such as Rayleigh scattering, Brillouin scattering and Raman scattering. LS-DTS can display the temperature signal in real time by sending the scattered Raman light wave to the signal processing system after wavelength division multiplexing, photoelectric conversion, amplification and demodulation; and locate this information through the transmission speed of the light wave in the optical fiber and the time of the back light echo.

[0010] The wireless micro-displacement monitoring system is based on the principle of electromagnetic fields and waves, integrating multiple positioning technologies such as ultra-wideband, Bluetooth, and accelerometers to achieve high-precision distance measurement and displacement monitoring. At the same time, the system integrates wireless data transmission, real-time monitoring of the distance, location, network and battery status of all users in the system, and provides alarm functions quickly and promptly. The data can be viewed in real time through a computer or mobile phone, which is convenient and fast; it can also be uploaded to a designated server in an encrypted manner, which is stable and reliable.

[0011] The fixing module includes a plurality of fixing parts, which are used to fix the optical cable in an S-shape at the tunnel vault position. The optical cable is arranged along the tunnel excavation direction, wherein the optical cable includes a plurality of straight optical cables and a plurality of curved optical cables. The curved optical cables are located between two adjacent straight optical cables, and the straight optical cables are perpendicular to the tunnel excavation direction. A fiber coiling box is arranged between at least three straight optical cables, and the fiber coiling box contains optical cable fibers.

[0012] The fixing member can be a steel wire or a cable tie, and when fixing, the steel wire or cable tie is closely tied with the main reinforcement for fixing connection, and after the whole is fixed, it is further fixed by applying glue. The fixing member can also be other fixing structures as long as it can achieve fixation.

[0013] However, in actual use, the existing fixing structure is cumbersome to operate, and there is a risk of personal injury when the optical cable falls off. Based on this, the utility model provides a fixing structure. The fixing includes a support for supporting the optical cable, and the support includes a fixed ring and a movable rod, and the fixed ring is movably connected above the movable rod. The upper end of the movable rod is connected to the fixed ring, and the lower end of the movable rod is on the ground of the tunnel, and a pulley is provided at the lower end of the movable rod. The movable rod drives the fixed ring to move on the tunnel, so that it is suitable for optical cables in different positions and is convenient for supporting them. The system supports the optical cable at the same time through a number of fixings. After the overall positioning, the fixing connection is quickly fixed by applying glue, and after the connection is stable, the fixing is removed to avoid the problem of the optical cable falling off during the construction of the tunnel. Compared with the existing methods, it can save labor to a great extent, improve efficiency, and thus improve safety performance.

[0014] Furthermore, after the optical cable is initially fixed, the artificial glue cannot be applied evenly, and if the artificial glue is not evenly applied to all positions, the risk of falling off is easily increased.

[0015] Based on this, the present invention connects a rotating member between the fixed ring and the moving rod, and the rotating member can make the fixed ring rotate on the moving rod. The rotating member can be of various structures, as long as it can adjust the direction and angle of the fixed ring on the moving rod. In the present invention, the fixed ring can not only be used to support the optical cable, but also, during the rotation process, the fixed ring can rotate on the optical cable to complete the glue coating.

[0016] Specifically, the rotating member includes a rotating plate arranged on the fixed ring, a gear plate is coaxially connected to the rotating plate, an adjusting rod is arranged on the moving rod, the upper end of the adjusting rod is meshed with the gear plate, the lower end of the adjusting rod passes through the moving rod, the moving rod can move up and down at the moving rod, and the fixed ring is rotated through the gear plate. Under the structure of this device, after the fixed ring rotates to a certain angle, the angle can be maintained, which is convenient for support and fixation.

[0017] Especially for tunnels under construction, when the ground where the moving rod is placed is uneven, the fixing ring can be rotated to a suitable angle to support and fix the optical cable.

[0018] At the same time, when adjusting the angle of the fixed ring, the device can directly adjust the adjustment rod. Specifically, the adjustment rod includes a first rod and a second rod. The lower end of the first rod is provided with a T-shaped groove, and the upper end of the second rod is provided with a T-shaped rod corresponding to the T-shaped groove. The T-shaped rod is located in the T-shaped groove, and the second rod can rotate circumferentially on the first rod. The upper end of the first rod is engaged with the gear plate, and the second rod is connected to the moving rod by a thread. By rotating the second rod, the height position of the adjustment rod is adjusted, and then the angle of the fixed ring is adjusted. After the angle of the fixed ring is adjusted, the angle of the fixed ring will not change because the height of the adjustment rod is fixed.

[0019] Furthermore, a receiving cavity is provided inside the fixing ring, a glue coating member is provided inside the receiving cavity, a plurality of coating rods are provided on the coating member, a coating port is provided at the upper end of the coating rod, a plurality of through holes corresponding to the coating rods are provided on the fixing ring, a telescopic member is provided on the fixing ring, and the telescopic member enables the coating port of the coating rod to be located inside the receiving cavity or outside the fixing ring. A ball bearing is provided on the coating port, and the ball bearing can rotate on the coating port. When the fixing ring rotates on the optical cable, the ball bearing on the coating port contacts the optical cable, and the glue is coated on the optical cable, thereby improving the coating efficiency and being more convenient to use.

[0020] On the other hand, the utility model also includes a distributed optical fiber fixed structure based on a tunnel under construction, and the monitoring method includes the following steps:

[0021] The plurality of fixing parts of the fixing module fix the optical cable in an S-shape at the tunnel vault position; the plurality of fixing parts are numbered in sequence, and signal lights are arranged on the plurality of fixing parts;

[0022] Distributed optical fiber stress strain monitoring system monitors strain data;

[0023] Wireless three-dimensional micro-displacement monitoring system monitors displacement data;

[0024] Distributed fiber optic temperature monitoring system monitors temperature data;

[0025] The early warning cloud system obtains strain data, displacement data and temperature data, and obtains health data through strain data, displacement data and temperature data;

[0026] The early warning cloud system obtains the location information of the problem section based on the health data, and obtains the number of the corresponding fixed part based on the location information of the problem section. The signal light of the fixed part with the corresponding number of the problem section location information flashes.

[0027] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0028] The utility model is based on a distributed optical fiber fixing structure of a tunnel under construction. The utility model performs health monitoring of the tunnel under construction through a distributed optical fiber stress-strain monitoring system, a wireless three-dimensional micro-displacement monitoring system and a distributed optical fiber temperature monitoring system. During the monitoring process, the optical cable is initially fixed by a fixing piece, and then glue is applied to the optical cable through the fixing piece. There is no need for operators to climb up to operate, and the problem of personal injury caused by the optical cable falling off during the construction of the tunnel is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0030] Figure 1 It is a schematic diagram of the structure of the fixed ring and the rotating member in Example 1;

[0031] Figure 2 A bottom view of the optical cable arrangement in the tunnel vault in Example 1;

[0032] Figure 3 This is a schematic diagram of the layout of optical cables in the tunnel in Example 1;

[0033] Figure 4 is a schematic structural diagram of the adjustment rod in Example 1;

[0034] Figure 5 This is a schematic diagram of the moving rod in Example 1, with the fixed ring facing upward;

[0035] Figure 6 It is a schematic diagram of the moving rod when the fixing ring rotates toward one side in Example 1;

[0036] Figure 7 It is a schematic diagram of the moving rod when the fixed ring rotates toward the other side in Example 1;

[0037] Figure 8 Schematic diagram of the fixing ring structure in Example 2 when no glue coating is required

[0038] Fig. 9 This is a schematic diagram of the fixing ring structure when glue coating is required in Example 2.

[0039] Marks and corresponding parts names in the attached drawings:

[0040] 1-fixed ring, 2-rotating plate, 3-gear plate, 4-adjusting rod, 41-first rod, 42-second rod, 5-connecting block, 6-moving rod, 7-first connecting rod, 8-second connecting rod, 9-telescopic rod, 10-accommodating chamber, 11-glue coating part, 12-coating rod, 13-optical cable, 14-fiber coil box. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0042] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0043] Example 1

[0044] Several fixings are used to fix the optical cable 13 in an S-shape at the tunnel vault position. The optical cable 13 is arranged along the tunnel excavation direction, such as Figure 2 and Figure 3 As shown, the optical cable 13 includes a plurality of straight optical cables and a plurality of curved optical cables, wherein the curved optical cables are located between two adjacent straight optical cables, and the straight optical cables are perpendicular to the tunnel excavation direction. Among them, a fiber coil box 14 is arranged between at least three straight optical cables, and the fiber coil box 14 is provided with optical cable coils.

[0045] Arrange a set of monitoring equipment in the machine room, lead the optical cable out, and connect a fiber core in the most common single-mode to achieve ultra-long-distance strain monitoring. Simply place the optical cable in position to transmit the surrounding stress information back through the optical cable itself. No other equipment needs to be added along the way, and no electricity or signal transmission lines need to be laid. The optical cable itself can transmit the sensed signal back.

[0046] The fixing member includes a support member for supporting the optical cable 13, and the support member includes a fixing ring 1 and a moving rod 6. The fixing ring 1 is used to contact the optical cable, the upper end of the moving rod 6 is connected to the fixing ring, and the lower end of the moving rod is connected to a pulley to contact the tunnel ground.

[0047] Before laying the optical cable into the tunnel, it is necessary to estimate the length of the optical cable and leave enough margin according to the on-site construction progress and installation conditions; use a laser level to mark the optical cable for the initial layout to ensure that the optical cable is arranged on the same horizontal line; the optical cable is arranged in an "S" shape in the tunnel, and is supported by multiple supports during layout to complete the initial fixation.

[0048] In order to better support the optical cable stably, a rotating member is connected between the fixed ring 1 and the moving rod 6, and the rotating member can make the fixed ring 1 rotate on the moving rod 6. Figure 1As shown, the fixed ring is a semi-cylindrical structure, the fixed ring 1 is movably connected above the moving rod 6, the rotating member includes a rotating plate 2 arranged on the fixed ring 1, the rotating plate 2 is coaxially connected to the gear plate 3, the moving rod 6 is connected to the first connecting rod 7, the first connecting rod 7 is vertically connected to the second connecting rod 8, and the second connecting rod 8 can rotate circumferentially on the first connecting rod 7, the two ends of the second connecting rod 8 are respectively connected to a rotating plate 2, and the two rotating plates 2 are connected to the fixed ring. The moving rod 6 is provided with an adjusting rod 4, the upper end of the adjusting rod 4 is meshed with the gear plate 3, the lower end of the adjusting rod 4 passes through the moving rod 6, the moving rod 6 can move up and down at the moving rod 6, and the fixed ring 1 is rotated through the gear plate 3.

[0049] like Figure 4 As shown, the adjustment rod 4 includes a first rod 41 and a second rod 42, the lower end of the first rod 41 is provided with a T-shaped groove, the upper end of the second rod 42 is provided with a T-shaped rod corresponding to the T-shaped groove, the T-shaped rod is located in the T-shaped groove, and the second rod 42 can rotate circumferentially on the first rod 41, the upper end of the first rod 41 is engaged with the gear plate 3, and the second rod 42 is connected to the connecting block 5 on the moving rod 6 by threads. The connecting block 5 is connected to the first connecting rod 7.

[0050] When in use, when the fixing ring 1 is facing upward, Figure 5 As shown, when the fixing ring needs to be rotated, Figure 6 As shown, the second rod 42 is rotated, and the second rod 42 rotates on the internal thread of the connecting block 5 and moves upward, and the second rod drives the first rod 41 to move upward at the same time, and the first rod 41 is engaged with the gear plate 3. When the gear plate 3 is engaged and moves upward, it drives the gear plate to rotate, and then drives the fixing ring 1 to rotate. When the second rod 42 is rotated so that the second rod 42 drives the first rod 41 to move downward, as shown in FIG. Figure 7 As shown, the gear plate rotates, driving the fixing ring 1 to rotate in another direction.

[0051] Example 2

[0052] Based on the above embodiments, Figure 8 As shown, a accommodating cavity 9 is provided inside the fixing ring 1, a glue coating member 11 is provided in the accommodating cavity 10, a plurality of coating rods 12 are provided on the glue coating member 11, a coating port is provided at the upper end of the coating rod 12, a ball is provided on the coating port, and the ball can rotate on the coating port, the coating rod 12 is communicated with the inside of the glue coating member 11, and the coating port is also communicated with the inside of the glue coating member, and the colloid is installed in the glue coating member.

[0053] The fixing ring 1 is provided with a plurality of through holes corresponding to the application rods 12 one by one. The fixing ring 1 is provided with a telescopic member, which enables the application opening of the application rod 12 to be located inside the accommodating cavity 10 or outside the fixing ring 1 .

[0054] The telescopic member includes a telescopic rod 9, one end of which is connected to a glue coating member 11, so that the glue coating member 11 moves in the accommodating chamber 10. When glue coating is not required, Fig. 9 As shown in FIG. 1 , the telescopic rod 9 is shortened, and the lower end of the glue coating member 11 contacts the inner bottom of the accommodating chamber 10. When glue coating is required, the telescopic rod 9 is extended, the glue coating member 11 moves in the accommodating chamber, and the coating rod 12 of the glue coating member 11 is inserted into the through hole, as shown in FIG. Fig. 9 As shown, the ball on the coating port is located outside the fixing ring 1, that is, at the inner ring of the fixing ring. When the fixing ring rotates on the optical cable along the outer side of the optical cable, the ball contacts the optical cable and then coats the glue on the optical cable.

[0055] The moving rod 6 is a telescopic structure with a retractable length. When the coating opening of the coating rod 12 is located in the accommodating chamber 10, the lower end of the coating member 11 contacts the inner wall of the lower end of the accommodating chamber 10; when the coating opening of the coating rod 12 is located outside the fixing ring 1, the upper end of the coating member 11 contacts the inner wall of the upper end of the accommodating chamber 10.

[0056] Specifically, when applying glue, first shorten the height of the moving rod, separate the optical cable from the inner wall of the tunnel, and there is a certain gap between the optical cable at this location and the inner wall of the tunnel. The other locations of the optical cable are supported by the moving rod, so the optical cable at the shortened moving rod will not be completely removed. The telescopic rod 9 is extended, the glue coating member 11 moves in the accommodating cavity, the coating rod 12 of the glue coating member 11 is inserted into the through hole, the ball contacts the optical cable, and the operator rotates the second rod 42 to rotate the fixing ring 1 on the optical cable, thereby applying glue to the optical cable at this location in all directions.

[0057] Therefore, in the process of health monitoring of tunnels under construction, the utility model does not require operators to climb up to apply glue when fixing the optical cable, which effectively improves efficiency, saves costs, and improves safety performance. In addition, during the installation process, the optical cable is supported by a mobile rod, which can further improve safety performance.

[0058] After gluing, for further fixation, each section can be fixedly connected with steel wire or cable tie along with the main reinforcement. Compared with the existing structure, the device uses fewer points for connection with steel wire or cable tie, which can greatly reduce labor costs.

[0059] Example 3

[0060] The device is used in a monitoring system, which includes an early warning cloud system, a distributed optical fiber stress and strain monitoring system, a wireless three-dimensional micro-displacement monitoring system and a distributed optical fiber temperature monitoring system. The distributed optical fiber stress and strain monitoring system is used to monitor strain data, the wireless three-dimensional micro-displacement monitoring system is used to monitor displacement data, and the distributed optical fiber temperature monitoring system is used to monitor temperature data; the early warning cloud system is used to obtain strain data, displacement data and temperature data, and obtain health data through strain data, displacement data and temperature data;

[0061] The monitoring system also includes a fixing module, which includes a plurality of fixing members, and the plurality of fixing members are used to fix the optical cable 13 in an S-shaped manner at the position of the tunnel vault. The optical cable 13 is arranged along the tunnel excavation direction, such as Figure 2 and Figure 3 As shown, the optical cable 13 includes a plurality of straight optical cables and a plurality of curved optical cables, wherein the curved optical cables are located between two adjacent straight optical cables, and the straight optical cables are perpendicular to the tunnel excavation direction. Among them, a fiber coil box 14 is arranged between at least three straight optical cables, and the fiber coil box 14 is provided with optical cable coils.

[0062] Arrange a set of monitoring equipment in the machine room, lead the optical cable out, and connect a fiber core in the most common single-mode to achieve ultra-long-distance strain monitoring. Simply place the optical cable in position to transmit the surrounding stress information back through the optical cable itself. No other equipment needs to be added along the way, and no electricity or signal transmission lines need to be laid. The optical cable itself can transmit the sensed signal back.

[0063] It also includes a fiber break monitoring module, which is used to obtain the location information of the broken fiber and send the location information of the broken fiber to the early warning cloud system. The system quickly determines the location of the broken fiber through real-time monitoring of the internal reflection of the optical fiber to reduce the loss caused by the accident, and the positioning accuracy is within 10 meters.

[0064] When in use, the highway tunnel health monitoring method of the present invention comprises the following steps:

[0065] The plurality of fixing parts of the fixing module fix the optical cable 13 in an S-shape at the tunnel vault position; the plurality of fixing parts are numbered in sequence, and signal lights are arranged on the plurality of fixing parts;

[0066] Distributed optical fiber stress strain monitoring system monitors strain data;

[0067] Wireless three-dimensional micro-displacement monitoring system monitors displacement data;

[0068] Distributed fiber optic temperature monitoring system monitors temperature data;

[0069] The early warning cloud system obtains strain data, displacement data and temperature data, and obtains health data through strain data, displacement data and temperature data;

[0070] The early warning cloud system obtains the location information of the problem section based on the health data, and obtains the number of the corresponding fixed part based on the location information of the problem section, and the signal light of the fixed part with the corresponding number of the location information of the problem section flashes.

[0071] The terms "first", "second", etc. used herein are only used to distinguish the corresponding components for the sake of clarity of description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used herein, unless otherwise specified, may refer to direct connection or indirect connection via other components.

[0072] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A distributed optical fiber fixed structure based on a tunnel under construction, characterized in that: The invention comprises a plurality of fixing parts, which are used to fix the optical cable (13) on the tunnel. The fixing parts comprise a fixing ring (1) and a moving rod (6). A pulley is arranged at the lower end of the moving rod (6), and the upper end of the moving rod (6) is connected to the fixing ring (1). A rotating part is connected between the fixing ring (1) and the moving rod (6), and the rotating part makes the fixing ring (1) rotate on the moving rod (6).

2. The distributed optical fiber fixed structure based on the tunnel under construction according to claim 1 is characterized in that: The moving rod (6) is a telescopic structure with a telescopic length.

3. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 1 is characterized in that: The rotating member comprises a rotating plate (2) arranged on a fixed ring (1), and a gear plate (3) is coaxially connected to the rotating plate (2).

4. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 3 is characterized in that: An adjusting rod (4) is arranged on the moving rod (6), the upper end of the adjusting rod (4) is meshed with the gear plate (3), the lower end of the adjusting rod (4) passes through the moving rod (6), and the adjusting rod (4) can move up and down at the moving rod (6), so that the gear plate (3) drives the fixing ring (1) to rotate.

5. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 4 is characterized in that: The adjusting rod (4) comprises a first rod (41) and a second rod (42), wherein the second rod (42) can rotate circumferentially on the first rod (41), the upper end of the first rod (41) is meshed with the gear plate (3), and the second rod (42) is connected to the moving rod (6) by means of threads.

6. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 5, characterized in that: The lower end of the first rod (41) is provided with a T-shaped groove, and the upper end of the second rod (42) is provided with a T-shaped rod corresponding to the T-shaped groove, and the T-shaped rod is located in the T-shaped groove.

7. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 1, characterized in that: A accommodating cavity (10) is arranged inside the fixing ring (1), a glue coating member (11) is arranged inside the accommodating cavity (10), a plurality of smearing rods (12) are arranged on the glue coating member (11), a smearing opening is arranged at the upper end of the smearing rod (12), a colloid is arranged inside the glue coating member (11), and the inside of the glue coating member (11) is connected with the smearing opening; a plurality of through holes corresponding to the smearing rods (12) are arranged on the fixing ring (1), and a telescopic member is arranged on the fixing ring (1), and the telescopic member enables the smearing opening of the smearing rod (12) to be located inside the accommodating cavity (10) or outside the fixing ring (1).

8. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 7, characterized in that: A ball is arranged on the coating opening, and the ball can rotate on the coating opening. When the coating opening of the coating rod (12) is located outside the fixing ring (1), the ball contacts the optical cable (13).

9. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 7, characterized in that: The telescopic member is a telescopic rod.

10. The distributed optical fiber fixing structure based on the tunnel under construction according to claim 7, characterized in that: When the coating opening of the coating rod (12) is located in the accommodating chamber (10), the lower end of the coating member (11) contacts the inner wall of the lower end of the accommodating chamber (10); when the coating opening of the coating rod (12) is located outside the fixing ring (1), the upper end of the coating member (11) contacts the inner wall of the upper end of the accommodating chamber (10).

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