Dam leakage monitoring device based on optical fiber temperature measurement

Abstract

The invention relates to the technical field of dam leakage monitoring, in particular to a dam leakage monitoring device based on optical fiber temperature measurement, which comprises an outer protection tube, an optical fiber is arranged in the outer protection tube, the optical fiber is bent into a U shape in the outer protection tube, and the two ends of the optical fiber extend out of the upper end of the outer protection tube. A drill bit is fixedly arranged at the lower end of the outer protection pipe, a wire pulling assembly is arranged at the end, provided with the drill bit, of the outer protection pipe, the lower portion of the optical fiber penetrates through the wire pulling assembly, the wire pulling assembly is detachably connected to the drill bit, and an expansion assembly is arranged in the outer protection pipe. The expansion assembly extrudes the optical fiber to be attached to the inner wall of the outer protection tube. The optical fiber embedding device has the advantage that the optical fibers can be conveniently embedded after the dam is built.

Description

Technical Field

[0001] This application relates to the technical field of dam leakage monitoring, and in particular to a dam leakage monitoring device based on fiber optic temperature measurement. Background Technology

[0002] Earth-rock dams serve to impound water, and their safety is crucial to the lives and property of people downstream. The seepage status of dams is vital to their safe operation; therefore, strengthening seepage monitoring of earth-rock dams is of paramount importance for ensuring their safety. Optical fiber, using light as a medium and transmitting light signals, is immune to electromagnetic interference, exhibiting high sensitivity and accuracy. It can accurately measure the temperature along its path, allowing for the monitoring of seepage locations within dams.

[0003] A fiber optic monitoring device for seepage in earth-rock dams is disclosed in related technologies. It includes a fiber optic sensing unit and a fiber optic heating unit. The fiber optic sensing unit includes armored optical fiber and a fiber optic frame. The fiber optic heating unit is connected to the armored optical fiber. The armored optical fiber is arranged on the fiber optic frame, and one end of the armored optical fiber is used to connect to a laser, a fiber wavelength division multiplexer, a photoelectric receiver amplifier, and a signal processor. The armored optical fiber is a linear multimode optical fiber. The armored optical fiber is spirally wound on the fiber optic frame to form the fiber optic sensing unit. The fiber optic sensing unit is laid flat and pre-embedded in the dam. Then, the signal processor is used to analyze and process the signal in the optical fiber.

[0004] However, in the above structure, because the armored optical fiber is located on the outside of the optical fiber frame, it is difficult to bury the optical fiber sensor unit in the existing dam. Summary of the Invention

[0005] In order to facilitate the installation of optical fibers after the dam is built, this application provides a dam seepage monitoring device based on optical fiber temperature measurement.

[0006] This application provides a dam seepage monitoring device based on fiber optic temperature measurement, which adopts the following technical solution: A dam seepage monitoring device based on fiber optic temperature measurement includes an outer protective tube, an optical fiber inside the outer protective tube, the optical fiber being bent into a U-shape inside the outer protective tube with both ends extending from the upper end of the outer protective tube, a drill bit fixedly installed at the lower end of the outer protective tube, a pull wire assembly installed at the end of the outer protective tube where the drill bit is installed, the lower part of the optical fiber passing through the pull wire assembly, the pull wire assembly being detachably connected to the drill bit, and an expansion assembly installed inside the outer protective tube, the expansion assembly pressing the optical fiber against the inner wall of the outer protective tube.

[0007] By adopting the above technical solution, during use, the drill bit connected to the outer protective tube is first drilled into the dam, allowing the outer protective tube to rotate and enter the dam. Then, the optical fiber is threaded into the puller assembly, which is detachably connected to the drill bit. This allows the puller assembly to guide the optical fiber downwards into the outer protective tube from the lower end, and straighten the optical fiber. Then, the expansion assembly is placed inside the outer protective tube, increasing its radial dimension. This allows the optical fiber to abut against the inner wall of the outer protective tube under the action of the expansion assembly, thus enabling the monitoring of the temperature of the inner wall of the outer protective tube. After the dam is built, the optical fiber can be easily buried. Furthermore, if the optical fiber is damaged, the puller assembly can be removed, making the optical fiber easy to maintain.

[0008] Preferably, the outer protective tube includes a heat insulation part and a heat conduction part. The heat insulation part is arranged in a semi-circular arc shape. There are two heat insulation parts arranged opposite each other. The heat conduction part is located at the position where the heat insulation parts meet and separates the two heat insulation parts. The optical fiber is attached to the heat conduction part.

[0009] By adopting the above technical solution, the heat insulation part is set into a two-half structure, and the two heat conduction parts are separated by the two heat insulation parts. The heat conduction parts contact the optical fiber, and the contact points between the optical fiber and the two heat conduction parts can be monitored. This allows the temperature changes of the two heat conduction parts to corroborate the data monitored by the optical fiber, thereby improving the accuracy of the monitoring data.

[0010] Preferably, the heat-conducting part has an arc-shaped groove on one side of the outer protective tube, and the optical fiber is placed in the arc-shaped groove.

[0011] By adopting the above technical solution, the arc-shaped groove is set on the side of the heat-conducting part located inside the outer protective tube, so that the optical fiber is positioned through the arc-shaped groove, and the optical fiber can be accurately set along the heat-conducting part, ensuring the depth of the optical fiber detection position can be determined.

[0012] Preferably, the cable pulling assembly includes a movable block, pulleys, and bar magnets. Two pulleys are spaced apart, and the optical fiber passes through the bottom of the pulleys. Two bar magnets are provided, one of which is fixed to the drill bit, and the other bar magnet is fixed to the side of the movable block facing the drill bit. When the cable pulling assembly is located at the lower end of the outer protective tube, the two bar magnets attract each other and adjust the direction of the movable block so that the optical fiber and the arc groove are aligned.

[0013] By adopting the above technical solution, two pulleys are set on the movable block, and optical fibers are threaded through the two pulleys to make the optical fibers directional. When the movable block is placed at the position of the drill bit, the bar magnet can make the movable block rotate under the action of attraction and align the optical fiber on the movable block with the arc groove, so as to facilitate the expansion component to press the optical fiber into the arc groove, which facilitates the accurate installation of the optical fiber.

[0014] Preferably, the expansion assembly includes an inner support tube and an air bladder. The inner support tube is disposed inside the outer protective tube, and the air bladder is fixed on the inner wall of the inner support tube. After the air bladder is inflated, it fills the space between the inner support tube and the outer protective tube. The optical fiber is located between the air bladder and the inner wall of the outer protective tube.

[0015] By adopting the above technical solution, an airbag is fixed on the outer wall of the inner support tube, so that the inner support tube guides the airbag into the outer protective tube, and at the same time, the inner support tube can reduce the size of the airbag.

[0016] Preferably, the heat-conducting part is fixedly provided with connecting parts on both sides facing the heat-insulating part, the connecting parts are integrally formed with the heat-conducting part, the connecting parts extend into the heat-insulating part, and multiple barbs are provided on the connecting parts.

[0017] By adopting the above technical solution, the connecting part and the heat-conducting part are integrally formed, and multiple barbs are provided on the connecting part to increase the contact area between the connecting part and the heat insulation part, thereby improving the connection between the heat insulation part and the heat-conducting part.

[0018] Preferably, the outer protective tube is configured in multiple sections, with a connecting ring between two adjacent sections. A connecting groove is formed on the inner wall of the outer protective tube, extending to the connecting portion, and the connecting ring is attached to the connecting portion.

[0019] By adopting the above technical solution, the outer protective pipe is set in multiple sections, which facilitates the transportation of the outer protective pipe and allows for installation of the required length as needed. The connecting groove is used to install the connecting part, which can transfer the heat of the two heat-conducting parts. When the temperature of one heat-conducting part is abnormal, the other heat-conducting part can be affected by the temperature change of the heat-conducting part, thereby determining the location of the leak.

[0020] Preferably, a removable reinforcing tube is provided inside the outer protective tube. One end of the reinforcing tube is connected to the drill bit, and the middle part of the reinforcing tube is fixed to the inner wall of the outer protective tube. The reinforcing tube is used to rotate the drill bit. After the outer protective tube is installed, the reinforcing tube is removed from the outer protective tube.

[0021] By adopting the above technical solution, when installing the outer protective tube, the reinforcing tube is connected to the drill bit, so that the reinforcing tube can be made of a high-strength material. When the drill bit rotates, the reinforcing tube ensures the effective operation of the drill bit. At the same time, the reinforcing tube can be removed from the outer protective tube and reused.

[0022] Preferably, the drill bit has two connecting holes, and the end of the reinforcing tube is provided with a connecting post parallel to the reinforcing tube. The connecting post is used to insert into the connecting hole. The side wall of the reinforcing tube is provided with multiple mounting holes, and an air expansion column is provided in the mounting hole. The air expansion column is used to abut against the inner wall of the outer protective tube.

[0023] By adopting the above technical solution, a connecting hole is opened on the drill bit, and the connecting post on the reinforcing tube can be directly inserted into the connecting hole, so that the rotation of the drill bit and the reinforcing tube can transmit a large torque. At the same time, the air expansion column fixes the reinforcing tube and the outer protective tube, so that the outer protective tube rotates with the reinforcing tube and reduces the drill bit from falling off the reinforcing tube.

[0024] Preferably, a rubber head is fixedly provided at one end of the air expansion column near the inner wall of the outer protective tube, and a spring is sleeved on the air expansion column. The force of the spring is used to drive the air expansion column away from the inner wall of the outer protective tube.

[0025] By adopting the above technical solution, a rubber head is fixed on the air expansion column, and the rubber head abuts against the inner wall of the outer protective tube, which improves the firmness of the connection between the reinforcing tube and the outer protective tube. When the air expansion column is released, the air expansion column can automatically detach from the outer protective tube, making it convenient to remove the reinforcing tube from the outer protective tube.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The drill bit connected to the outer protective tube is drilled into the dam, and the outer protective tube is rotated into the dam. Then the optical fiber is threaded into the puller assembly. The puller assembly is detachably connected to the drill bit, so that the puller assembly can guide the optical fiber downward into the outer protective tube from the lower end of the outer protective tube. The puller assembly straightens the optical fiber, so that the optical fiber can be buried relatively easily after the dam is built. 2. An arc-shaped groove is set on the side of the heat-conducting part located inside the outer protective tube, so that the optical fiber is positioned by the arc-shaped groove. The optical fiber can be accurately set along the heat-conducting part, ensuring the depth of the optical fiber detection position can be determined. 3. When the movable block is placed in the position of the drill bit, the bar magnet can rotate the movable block under the action of attraction and align the optical fiber on the movable block with the arc groove, so as to facilitate the expansion component to press the optical fiber into the arc groove, thus facilitating the accurate installation of the optical fiber. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the outer protective tube in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the outer protective tube in the embodiments of this application; Figure 4 This is a schematic diagram of the installation of the docking ring in an embodiment of this application; Figure 5 This is a schematic diagram of the pull wire assembly in an embodiment of this application; Figure 6 This is a schematic diagram of the installation of the reinforcing tube in an embodiment of this application; Figure 7 This is a schematic diagram showing the position of the air column in an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Outer protective tube; 11. Heat insulation part; 12. Heat conduction part; 13. Arc groove; 14. Connecting part; 15. Barb; 2. Optical fiber; 3. Drill bit; 4. Pulling wire assembly; 41. Movable block; 42. Pulley; 43. Bar magnet; 44. Mounting groove; 5. Expansion assembly; 51. Inner support tube; 52. Airbag; 53. Connecting tube; 6. Docking ring; 61. Connecting groove; 7. Reinforcing tube; 71. Connecting column; 72. Connecting hole; 73. Air expansion column; 74. Mounting hole; 75. Spring; 76. Rubber head. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0030] This application discloses a dam seepage monitoring device based on fiber optic temperature measurement, referring to... Figure 1 The system includes an outer protective tube 1 and an optical fiber 2. The outer protective tube 1 is inserted into the dam and can be inserted parallel to the water-facing side of the dam or vertically downwards as needed. A drill bit 3 is installed at the lower end of the outer protective tube 1 and is fixed to the outer protective tube 1. In use, the drill bit 3 is first fixed to the outer protective tube 1, and then a hole is drilled by rotating it, with the outer protective tube 1 entering along with the drill bit 3. The optical fiber 2 is installed inside the outer protective tube 1 and can be removed from the outer protective tube 1, allowing the optical fiber 2 to be placed inside the outer protective tube 1 after installation. The portion of the optical fiber 2 inside the outer protective tube 1 is attached to the inner wall of the outer protective tube 1, allowing the optical fiber 2 to detect the temperature on the side wall of the outer protective tube 1. This allows the signal from the optical fiber 2 to identify locations of temperature anomalies in the outer protective tube 1, thereby enabling the monitoring of dam leakage locations.

[0031] refer to Figure 2 One end of the drill bit 3 can be fixed to the end of the outer protective tube 1 by welding or threading. The outer protective tube 1 can also have a multi-section structure to allow it to be connected to the required length. A pull-wire assembly 4 is installed on the drill bit 3 and inside the outer protective tube 1. The pull-wire assembly 4 allows the optical fiber 2 to pass through it, forming a U-shape inside the outer protective tube 1 after passing through the assembly. The optical fiber 2 extends from the top of the outer protective tube 1, and multiple optical fibers 2 within the outer protective tubes 1 are connected sequentially. The portion of the optical fiber 2 outside the outer protective tube 1 can be horizontally buried on a dam at a depth of 10-20 cm. The top of the outer protective tube 1 can be sealed with a sealing material.

[0032] refer to Figure 2 and Figure 3To ensure that the optical fiber 2 is placed inside the outer protective tube 1 and adheres to the inner wall of the outer protective tube 1, enabling accurate temperature measurement, an expansion assembly 5 is installed inside the outer protective tube 1. The expansion assembly 5 includes an inner support tube 51 and air bladders 52. Multiple air bladders 52 are arranged sequentially along the length of the inner support tube 51. The inner support tube 51 can be made of plastic and can be multi-sectioned. The air bladders 52 are fitted onto the outer wall of the inner support tube 51, and the annular inner wall of the air bladder 52 is fixed to the inner support tube 51. A connecting tube 53 connects adjacent air bladders 52. In use, the gas inside the air bladders 52 is first emptied, then the air bladders 52 are arranged vertically within the outer protective tube 1 through the inner support tube 51, and then inflated. Due to the inner support tube 51, the airbag 52 can be easily installed inside the outer protective tube 1, while also reducing its volume. The space between the outer wall of the inner support tube 51 and the inner wall of the outer protective tube 1 is filled by the airbag 52. The optical fiber 2 is located between the airbag 52 and the outer protective tube 1. When the airbag 52 is inflated, it can press the optical fiber 2 against the inner wall of the outer protective tube 1. If the optical fiber 2 is damaged, the gas inside the airbag 52 can be extracted, and then the expansion component 5 can be removed through the inner support tube 51 to release the pressure on the optical fiber 2. The optical fiber 2 can then be pulled out of the outer protective tube 1 for replacement, facilitating maintenance.

[0033] refer to Figure 3 The outer protective tube 1 includes a heat-insulating part 11 and a heat-conducting part 12. The heat-insulating part 11 is made of plastic and has a semi-circular cross-section. Two heat-insulating parts 11 are arranged opposite each other. The heat-conducting part 12 is located at the junction of the two heat-insulating parts 11, sandwiched between the two heat-insulating parts 11, thus splicing the two heat-insulating parts 11 together. The two heat-insulating parts 11 and the two heat-conducting parts 12 form a circle. The heat-conducting part 12 is made of metal, preferably aluminum alloy. The width of the heat-conducting part 12 is greater than the diameter of the optical fiber 2 but less than twice the diameter of the optical fiber 2 to reduce the amount of material used in the heat-conducting part 12. One side of the heat-conducting part 12 is located outside the outer protective tube 1, and the other side of the heat-conducting part 12 is located inside the outer protective tube 1, so that the optical fiber 2 is attached to the heat-conducting part 12 for monitoring the temperature on the heat-conducting part 12. Because the insulation part 11 can separate the two heat-conducting parts 12 at the same outer protective tube 1, the optical fiber 2 can measure the temperature of the two heat-conducting parts 12 separately. When the temperature anomalies occur at the same height position of the two heat-conducting parts 12 at the same time, the signals can corroborate each other to improve the accuracy of monitoring. At the same time, the depth of the leakage position at the monitoring position can be obtained based on the length difference between the two temperature anomaly positions.

[0034] refer to Figure 3An arc-shaped groove 13 is formed on the side of the heat-conducting part 12 near the airbag 52, and the optical fiber 2 is placed in the arc-shaped groove 13. When the airbag 52 pushes the optical fiber 2 closer to the heat-conducting part 12, the arc-shaped groove 13 guides the optical fiber 2 to be parallel to the heat-conducting part 12, which facilitates the accurate installation of the optical fiber 2 inside the outer protective tube 1, thereby reducing the inaccurate temperature measurement caused by the optical fiber 2 sticking to the heat insulation part 11. In order to improve the connection between the heat-conducting part 12 and the heat insulation part 11, a connecting part 14 is fixedly provided on both sides of the heat-conducting part 12 facing the heat insulation part 11. The connecting part 14 is integrally formed with the heat-conducting part 12. The connecting part 14 extends from the arc-shaped end of the heat insulation part 11 and extends into the heat insulation part 11 along the arc shape of the heat insulation part 11. Multiple barbs 15 are provided on the side of the connecting part 14 away from the center of the outer protective tube 1. The barbs 15 can increase the contact area between the connecting part 14 and the heat insulation part 11 and increase the connection between the connecting part 14 and the heat insulation part 11.

[0035] refer to Figure 4 A docking ring 6 is provided at the connection point between the two outer protective tubes 1. The docking ring 6 can be made of aluminum alloy, giving both the docking ring 6 and the heat-conducting part 12 good thermal conductivity. When an abnormal temperature signal occurs in the heat-conducting part 12 on one side, the heat in the heat-conducting part 12 gradually decreases along its length. When it reaches the docking ring 6, it will also generate the same temperature signal in the optical fiber 2 on the other side, thus allowing the location of the leak to be roughly determined by the position of the docking ring 6. A connecting groove 61 is provided on the inner wall of the outer protective tube 1, extending from the inner wall of the outer protective tube 1 to the position of the connecting part 14. When the docking ring 6 is inserted into the connecting groove 61, the docking ring 6 fits against the heat-conducting part 12 and the connecting part 14. The docking ring 6 can be threaded or attached to the connecting groove 61.

[0036] refer to Figure 5The cable-drawing assembly 4 includes a movable block 41, pulleys 42, and bar magnets 43. A mounting groove 44 is formed in the middle of the movable block 41, the width of which is equal to the thickness of the pulley 42, allowing the pulley 42 to rotatably connect within the groove. Two pulleys 42 are provided, located at opposite ends of the groove. The optical fiber 2 passes through the lower parts of the two pulleys 42. Two bar magnets 43 are also provided; one bar magnet 43 is embedded in the end face of the drill bit 3, and the other bar magnet 43 is embedded in the lower surface of the movable block 41. The two ends of the bar magnet 43 can face the two heat-conducting parts 12. In use, first thread the movable block 41 onto the optical fiber 2, then place the movable block 41 from the top of the outer protective tube 1 into the outer protective tube 1. Due to the gravity of the movable block 41, the optical fiber 2 will gradually descend to the position of the drill bit 3. When it reaches the attraction range of the bar magnet 43, the bar magnet 43 will adjust the direction of the movable block 41 so that the optical fiber 2 can accurately align with the positions of the two heat-conducting parts 12. Then, straighten the upper end of the optical fiber 2 to align with the heat-conducting part 12, so that the optical fiber 2 will automatically enter the arc-shaped groove 13 of the heat-conducting part 12 when squeezed by the airbag 52. When the optical fiber 2 needs to be replaced, the movable block 41 can be removed from the drill bit 3, and then a new optical fiber 2 can be installed.

[0037] refer to Figure 6 and Figure 7 A reinforcing tube 7 is installed inside the outer protective tube 1. The reinforcing tube 7 is made of a high-strength material, such as stainless steel. The reinforcing tube 7 consists of multiple sections, with adjacent sections connected by threads. Two connecting posts 71 are fixedly installed at one end of the reinforcing tube 7. Two connecting holes 72, offset from the center of the drill bit 3, are opened on the drill bit 3. The connecting posts 71 are arranged along the length of the reinforcing tube 7 so that they can be inserted into the connecting holes 72. Multiple air expansion columns 73 are fixedly installed on the outer wall of the reinforcing tube 7. Multiple mounting holes 74 for installing the air expansion columns 73 are opened on the side wall of the reinforcing tube 7. One end of the air expansion column 73 is slidably connected in the mounting hole 74, and the other end extends out from the outer wall of the reinforcing tube 7. In use, pressurized gas is filled into the reinforcing tube 7, causing the air expansion columns 73 to abut against the inner wall of the outer protective tube 1. Then, the drill bit 3 is rotated through the reinforcing tube 7 to reduce damage to the outer protective tube 1. After the outer protective tube 1 is installed in place, the gas inside the reinforcing tube 7 is released. A spring 75 is then fitted onto the air expansion column 73. The force of the spring 75 is used to move the air expansion column 73 away from the inner wall of the outer protective tube 1, making it easier to pull the reinforcing tube 7 out of the outer protective tube 1 and allowing the reinforcing tube 7 to be reused. A rubber head 76 is fixedly installed at one end of the air expansion column 73 near the inner wall of the outer protective tube 1. The rubber head 76 is used to increase the friction between the air expansion column 73 and the outer protective tube 1.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dam leakage monitoring device based on fiber-optic temperature measurement, characterized by: The device includes an outer protective tube (1), an optical fiber (2) is installed inside the outer protective tube (1), the optical fiber (2) is bent into a U-shape inside the outer protective tube (1) and both ends of the optical fiber (2) extend from the upper end of the outer protective tube (1), a drill bit (3) is fixedly installed at the lower end of the outer protective tube (1), a wire pulling assembly (4) is installed at one end of the outer protective tube (1) where the drill bit (3) is installed, the lower part of the optical fiber (2) is threaded through the wire pulling assembly (4), the wire pulling assembly (4) is detachably connected to the drill bit (3), an expansion assembly (5) is installed inside the outer protective tube (1), the expansion assembly (5) squeezes the optical fiber (2) to stick to the inner wall of the outer protective tube (1).

2. The dam leakage monitoring device based on fiber-optic temperature measurement according to claim 1, characterized in that: The outer protective tube (1) includes a heat insulation part (11) and a heat conduction part (12). The heat insulation part (11) is set in a semi-circular arc shape. There are two heat insulation parts (11) and they are arranged opposite each other. The heat conduction part (12) is located at the position where the heat insulation parts (11) are connected and separates the two heat insulation parts (11). The optical fiber (2) is attached to the heat conduction part (12).

3. The dam leakage monitoring device based on fiber-optic temperature measurement according to claim 2, characterized in that: The heat-conducting part (12) has an arc-shaped groove (13) on one side inside the outer protective tube (1), and the optical fiber (2) is placed in the arc-shaped groove (13).

4. The dam leakage monitoring device based on optical fiber temperature measurement according to claim 2 or 3, characterized in that: The cable-pulling assembly (4) includes a movable block (41), a pulley (42), and a bar magnet (43). Two pulleys (42) are spaced apart. The optical fiber (2) passes through the bottom of the pulley (42). Two bar magnets (43) are provided. One bar magnet (43) is fixed on the drill bit (3), and the other bar magnet (43) is fixed on the side of the movable block (41) facing the drill bit (3). When the cable-pulling assembly (4) is located at the lower end of the outer protective tube (1), the two bar magnets (43) attract each other and adjust the direction of the movable block (41) so that the optical fiber (2) is directly opposite the arc groove (13).

5. The dam leakage monitoring device based on fiber-optic temperature measurement according to claim 4, characterized in that: The expansion assembly (5) includes an inner support tube (51) and an airbag (52). The inner support tube (51) is disposed inside the outer protective tube (1), and the airbag (52) is fixed on the inner wall of the inner support tube (51). After the airbag (52) is inflated, it fills the space between the inner support tube (51) and the outer protective tube (1). The optical fiber (2) is located between the airbag (52) and the inner wall of the outer protective tube (1).

6. The dam leakage monitoring device based on fiber-optic temperature measurement according to claim 2, characterized in that: The heat-conducting part (12) is fixedly provided with a connecting part (14) on both sides facing the heat insulation part (11). The connecting part (14) is integrally formed with the heat-conducting part (12). The connecting part (14) extends into the heat insulation part (11) and is provided with a plurality of barbs (15).

7. The dam leakage monitoring device based on fiber-optic temperature measurement according to claim 6, characterized in that: The outer protective tube (1) is configured in multiple sections, and a docking ring (6) is provided between two adjacent sections of the outer protective tube (1). A connecting groove (61) is provided on the inner wall of the outer protective tube (1), and the depth of the connecting groove (61) extends to the connecting part (14). The docking ring (6) is attached to the connecting part (14).

8. A dam seepage monitoring device based on fiber optic temperature measurement according to claim 1, characterized in that: The outer protective tube (1) is provided with a removable reinforcing tube (7). One end of the reinforcing tube (7) is connected to the drill bit (3), and the middle part of the reinforcing tube (7) is fixed to the inner wall of the outer protective tube (1). The reinforcing tube (7) is used to rotate the drill bit (3). After the outer protective tube (1) is installed, the reinforcing tube (7) is removed from the outer protective tube (1).

9. A dam seepage monitoring device based on fiber optic temperature measurement according to claim 8, characterized in that: The drill bit (3) has two connecting holes (72). The end of the reinforcing tube (7) is provided with a connecting post (71) parallel to the reinforcing tube (7). The connecting post (71) is used to insert into the connecting hole (72). The side wall of the reinforcing tube (7) is provided with multiple mounting holes (74). An air expansion column (73) is provided in the mounting hole (74). The air expansion column (73) is used to abut against the inner wall of the outer protective tube (1).

10. A dam seepage monitoring device based on fiber optic temperature measurement according to claim 9, characterized in that: A rubber head (76) is fixedly installed at one end of the air expansion column (73) near the inner wall of the outer protective tube (1). A spring (75) is sleeved on the air expansion column (73). The force of the spring (75) is used to drive the air expansion column (73) away from the inner wall of the outer protective tube (1).

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