An overhead line cable ground entry construction reconstruction promotion system

Abstract

This invention discloses an overhead power line cable undergrounding construction and upgrading system, which has good heat dissipation and is energy-saving and environmentally friendly. It includes a ground with a cable well and trench. The cable well is divided into a heat dissipation cavity and an underground cavity by a partition. The heat dissipation cavity is equipped with a power adjustable heat dissipation mechanism. The underground cavity is equipped with a pile foundation. The bottom and top of the pile foundation pass through the cable well and are fixed to the ground. A power transmission tower is installed on the top of the pile foundation. Multiple fixing frames are installed on the power transmission tower, and multiple cables are fixed to its transmission end. Multiple cable holes are opened in the ground and the cable well. A temperature-sensing spacing clamping mechanism is installed in the cable trench. Each cable passes through the corresponding fixing frame and cable hole in sequence to extend into the underground cavity and simultaneously passes through the temperature-sensing spacing clamping mechanism to enter the next adjacent system. A manhole with a ladder is provided in the ground, which is connected to the cable trench. A cover plate is provided at the top, and a first upper air outlet pipe equipped with an electric adjustment mechanism is connected to the cover plate.

Description

Technical Field

[0001] This invention belongs to the field of cable laying technology, specifically relating to an overhead line cable undergrounding construction, renovation and upgrading system. Background Technology

[0002] Traditional overhead cable laying is limited by the corridor space and the number of circuits on the same pole. Overhead lines often crisscross urban streets, squeezing into every available space. This leads to widespread unauthorized and haphazard wiring by other industries, negatively impacting the city's aesthetics and image, and creating safety hazards for operating lines and equipment. To address these issues, the current method for laying overhead cables is undergrounding them. This method offers advantages such as underground installation, saving surface space, and improving the city's appearance. Existing underground cable systems typically consist of cable wells and cable trenches. Cable holes are located in the top of the cable wells, and manholes are installed in the cable trenches. Cables are laid underground through these holes into the cable wells and then into the trenches for further processing. Maintenance is performed through the manholes. However, the cables in these underground systems are generally bundled. Bundled high-temperature cables hinder heat dissipation, and the inadequate heat dissipation structure fails to guarantee proper cooling, potentially creating safety hazards. Summary of the Invention

[0003] In view of the safety hazards posed by the existing overhead line cable undergrounding system in the background art, which has a bundled structure of cables and the high temperature of the bundled cables is not conducive to the dissipation of cable temperature, the present invention provides an overhead line cable undergrounding construction and upgrading system with good heat dissipation performance and energy-saving and environmental protection features.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] This invention discloses an overhead power line cable burial construction and upgrading system, comprising: a ground surface and a system control terminal. A cable well is formed by pouring concrete on one side of the ground surface, and a cable trench is formed on the other side. A partition is fixed to the side of the cable well away from the cable trench, dividing the interior of the cable well into a heat dissipation cavity and a burial cavity from the side furthest from the cable trench. An adjustable-power heat dissipation mechanism is installed inside the heat dissipation cavity. A pile foundation is installed in the middle of the burial cavity. The bottom end of the pile foundation extends through the cable well and is fixed to the ground surface, while the top end extends through the cable well and is fixed to the top of the ground surface. A transmission tower is fixed to the top of the pile foundation. Multiple fixing frames are fixed at equal intervals along the circumference of the transmission tower, and a power transmission end is fixed to... Multiple cables are provided, with cable holes corresponding to their positions on the ground and in the cable well. A temperature-sensitive spacing clamping mechanism is installed inside the cable trench. Multiple cables pass through corresponding fixing frames and cable holes in sequence, extending into the ground cavity and simultaneously passing through the temperature-sensitive spacing clamping mechanism to enter the next adjacent system. A manhole connected to the cable trench is fixed above the cable trench inside the ground. A ladder is fixed inside the manhole, with a cover plate bolted to its top. A first upper air outlet pipe connected to the manhole is fixed to the top of the cover plate. An electric adjustment mechanism is installed on the first upper air outlet pipe. The power-adjustable heat dissipation mechanism, the temperature-sensitive spacing clamping mechanism, and the electric adjustment mechanism are all remotely connected to the system control terminal.

[0006] Furthermore, the power-adjustable heat dissipation mechanism includes an upper air inlet pipe, a dust removal structure, a drying structure, and a power-adjustable fan, which are fixedly connected to both sides of the heat dissipation cavity from top to bottom, and an air outlet pipe fixed to the partition plate below the power-adjustable fan, connecting the heat dissipation cavity and the ground cavity. The upper air inlet pipe and the air outlet pipe are equipped with an electric adjustment mechanism, which is remotely connected to the system control terminal.

[0007] Furthermore, the temperature-sensing spacing clamping mechanism includes a lower clamping plate fixed to the bottom of the cable trench and an upper clamping plate movably placed above the lower clamping plate. Movable placement mechanisms are provided at both ends of the upper clamping plate. Multiple lower clamping grooves are evenly spaced at the top of the lower clamping plate, and multiple upper clamping grooves corresponding to the lower clamping grooves are evenly spaced at the bottom of the upper clamping plate. A clamping hole is formed between the upper clamping groove and the corresponding lower clamping groove. Multiple assembly through holes corresponding to and communicating with the multiple upper clamping grooves are evenly spaced at the top of the upper clamping plate. A temperature sensor is fixedly connected inside each assembly through hole, and the temperature sensor is remotely connected to the system control terminal.

[0008] Furthermore, the movable placement mechanism at both ends of the upper clamping plate includes two movable blocks symmetrically fixed to the upper clamping plate and two movable slots symmetrically opened on the inner wall of the cable trench along the X-direction central axis of the cable trench. A fixed rod is fixedly connected in the movable slot. The two movable blocks extend into the corresponding movable slots and are movably sleeved on the fixed rods. A connecting spring is sleeved on the fixed rod, with its two ends fixed to the top wall of the movable slot and the top wall of the movable block, respectively.

[0009] Furthermore, the electric regulating mechanism is a solenoid valve, which is remotely connected to the system control terminal.

[0010] Furthermore, a smoke detector is fixedly attached to the top of the underground cavity near the cable trench. A hidden groove is provided inside the manhole near the ladder. A pressure sensor is fixedly attached to the top wall of the hidden groove, and a rectangular frame dry powder box is movable and liftable inside the hidden groove. The rectangular frame dry powder box has a movable lifting mechanism on its side, and a dry powder inlet pipe with a valve is fixedly attached to one side wall of its top. A powder pump is fixedly attached to the rectangular groove of the rectangular frame dry powder box near the dry powder inlet pipe. The powder pump inlet end is fixedly attached to a powder inlet pipe that is fixed to the rectangular frame dry powder box and extends to the bottom end of the rectangular frame dry powder box, and a powder outlet pipe is fixedly attached to the powder outlet end. A spray pipe is fixedly attached to the side of the rectangular groove away from the dry powder inlet pipe and is fixedly connected to and communicates with the other end of the powder outlet pipe. Multiple nozzles are fixedly attached at equal intervals to the side of the spray pipe away from the powder outlet pipe. The powder pump is remotely connected to the system control terminal.

[0011] Furthermore, the movable lifting mechanism of the rectangular frame dry powder box includes a drive motor fixed to the bottom of the manhole and a drive groove opened inside the manhole. A transmission screw is placed in the drive groove. The bottom end of the transmission screw is connected to the output shaft of the drive motor through a coupling, and the top end of the transmission screw is connected to the manhole through a bearing. A transmission block with one end fixed to the rectangular frame dry powder box is connected to the transmission screw through a transmission nut. The drive motor is remotely connected to the system control terminal.

[0012] Furthermore, a filter chamber is provided inside the ground cavity near the heat dissipation cavity. A lower air inlet pipe and a lower air outlet pipe, which communicate with the heat dissipation cavity, are fixedly connected from top to bottom on the partition above the air outlet pipe. The lower air inlet pipe is located between the drying structure and the power adjustable fan, and the lower air outlet pipe is located below the power adjustable fan. The other end of the lower air outlet pipe is fixedly connected to the partition and communicates with the filter chamber. An air purification structure is fixedly connected inside the filter chamber. A second upper air outlet pipe is fixedly connected above the air purification structure. The second upper air outlet pipe passes through the cable well and extends to the ground. A solenoid valve is assembled on the lower air inlet pipe, the lower air outlet pipe, and the second upper air outlet pipe and is remotely connected to the system control terminal.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This invention places the underground cables at equal intervals to avoid mutual interference of high temperatures between the cables. At the same time, it is equipped with a power-adjustable heat dissipation mechanism, which can adjust the heat dissipation power according to the surface temperature of the cable. This not only ensures good heat dissipation performance of the underground cables, but also plays a role in energy saving and environmental protection.

[0015] 2. This invention is equipped with a fire isolation mechanism and a self-extinguishing mechanism, which can automatically isolate the cable trench when the cable overheats and catches fire, preventing the fire from spreading. At the same time, it can extinguish the fire itself, preventing the fire from spreading into the ground cavity and causing greater losses due to the long travel time for staff to arrive. This reduces the losses caused by the fire.

[0016] 3. The present invention is equipped with an air self-filtration mechanism, which can draw and filter the air at the scene after a fire, ensuring the environmental suitability when workers enter the cable well to repair cables, ensuring the health of workers and reducing the difficulty of repair. Attached Figure Description

[0017] Figure 1 This is a three-dimensional diagram of the overhead line cable undergrounding construction, renovation and upgrading system of the present invention;

[0018] Figure 2 This is a vertical sectional view of the overhead line cable undergrounding construction and upgrading system of the present invention;

[0019] Figure 3 This is a partial structural diagram of the overhead line cable undergrounding construction and upgrading system of the present invention;

[0020] Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle;

[0021] Figure 5 This is a partial structural diagram of the overhead line cable undergrounding construction and upgrading system of the present invention;

[0022] Figure 6 For the present invention Figure 5 Vertical section view;

[0023] In the diagram: 1. Ground; 2. Upper air inlet duct; 3. Dust removal structure; 4. Drying structure; 5. Adjustable power fan; 6. Lower air outlet duct; 7. Heat dissipation cavity; 8. Partition plate; 9. Air outlet duct; 10. Pile foundation; 11. Lower air inlet duct; 12. Filter cavity; 13. Air purification structure; 14. Cable well; 15. Cable; 16. Ground entry cavity; 17. Upper clamping plate; 18. Cable trench; 19. Manhole; 20. First upper air outlet duct; 21. Cover plate; 22. Transmission tower; 23. Smoke alarm; 24. Fixture; 25. Electricity 26. Cable hole; 27. Second upper air outlet duct; 28. Solenoid valve; 29. ​​Connecting spring; 30. Temperature sensor; 31. Assembly through hole; 32. Fixing rod; 33. Movable block; 34. Upper clamping groove; 35. Lower clamping plate; 36. Lower clamping groove; 37. Ladder; 38. Pressure sensor; 39. Hidden groove; 40. Rectangular frame dry powder box; 41. Transmission block; 42. Transmission screw; 43. Drive motor; 44. Nozzle; 45. Powder inlet pipe; 46. Spray pipe; 47. Powder outlet pipe; 48. Powder pump; 49. Dry powder inlet pipe. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," and "back" used in the present patent application specification and claims are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Any aspects not detailed in this invention are well-known to those skilled in the art.

[0025] Example 1:

[0026] Please see Figure 1-6The present invention provides the following technical solution: an overhead power line cable undergrounding construction and upgrading system, including a ground surface 1 and a system control terminal for controlling the entire system. A cable well 14 is formed by pouring concrete on one side of the ground surface 1, and a cable trench 18 is formed by pouring concrete on the other side. A partition 8 is fixedly connected to the side of the cable well 14 away from the cable trench 18, dividing the interior of the cable well 14 into a heat dissipation cavity 7 and an undergrounding cavity 16 from the side away from the cable trench 18 to the side closer to the cable trench 18. A power-adjustable heat dissipation mechanism is installed inside the heat dissipation cavity 7. A pile foundation 10 is placed in the middle of the undergrounding cavity 16. The bottom end of the pile foundation 10 penetrates the cable well 14 and extends into the ground surface 1 for fixation. The top end of the pile foundation 10 penetrates the cable well 14 and extends into the top of the ground surface 1 for fixation. A transmission tower 22 is fixedly connected to the top of the pile foundation 10. Multiple fixed members are fixedly connected at equal intervals along the circumference of the transmission tower 22. The transmission tower 22 has multiple cables 15 fixed to its transmission end on the frame 24. Cable holes 25 are opened on the ground 1 and cable well 14 corresponding to the positions of the cables 15. The cable trench 18 is equipped with a temperature-sensitive spacing clamping mechanism. Multiple cables 15 pass through the corresponding fixed frame 24 and cable hole 25 in sequence and extend into the ground cavity 16. At the same time, they pass through the temperature-sensitive spacing clamping mechanism to enter the next adjacent system. The ground 1 is located above the cable trench 18 and is fixed with a manhole 19 that communicates with the cable trench 18. A ladder 36 is fixed inside the manhole 19. A cover plate 21 is bolted to the top of the manhole 19. A first upper air outlet duct 20 communicating with the manhole 19 is fixed to the top of the cover plate 21. An electric adjustment mechanism is installed on the first upper air outlet duct 20. The power adjustable heat dissipation mechanism, the temperature-sensitive spacing clamping mechanism and the electric adjustment mechanism are remotely connected to the system control terminal.

[0027] Specifically, the power-adjustable heat dissipation mechanism includes, from top to bottom, an upper air inlet pipe 2, a dust removal structure 3, a drying structure 4, and a power-adjustable fan 5, which are fixed to both sides inside the heat dissipation cavity 7, and an air outlet pipe 9 fixed to the partition plate 8 and located below the power-adjustable fan 5, connecting the heat dissipation cavity 7 and the ground cavity 16. The upper air inlet pipe 2 and the air outlet pipe 9 are equipped with electric adjustment mechanisms, which are remotely connected to the system control terminal.

[0028] Specifically, the temperature-sensing spacing clamping mechanism includes a lower clamping plate 34 fixed to the bottom of the cable trench 18 and an upper clamping plate 17 movably placed above the lower clamping plate 34. The top of the lower clamping plate 34 is provided with multiple lower clamping grooves 35 at equal intervals. The bottom of the upper clamping plate 17 is provided with multiple upper clamping grooves 33 at equal intervals corresponding to the multiple lower clamping grooves 35. A clamping hole is formed between the upper clamping grooves 33 and the corresponding lower clamping grooves 35. The top of the upper clamping plate 17 is provided with multiple assembly through holes 30 at equal intervals corresponding to and communicating with the multiple upper clamping grooves 33. A temperature sensor 29 is fixedly connected inside the assembly through hole 30. The temperature sensor 29 is remotely connected to the system control terminal.

[0029] Specifically, the movable placement mechanism of the upper clamping plate 17 includes two movable blocks 32 symmetrically fixed to the upper clamping plate 17 and two movable slots symmetrically opened on the inner wall of the cable trench 18 along the X-direction central axis of the cable trench 18. A fixed rod 31 is fixedly connected in the movable slot. The two movable blocks 32 extend into the corresponding movable slots and are movably sleeved on the fixed rod 31. A connecting spring 28 is sleeved on the fixed rod 31, with its two ends fixed to the top wall of the movable slot and the top wall of the movable block 32, respectively.

[0030] Specifically, the electric regulating mechanism is a solenoid valve 27, which is remotely connected to the system control terminal.

[0031] In this embodiment, before the overhead line cable is buried, a foundation pit is dug on the ground 1, and the pile foundation 10 is constructed. Then, cable well 14 and cable trench 18 are poured outside the pile foundation 10 respectively. During the pouring of cable well 14, multiple cable holes 25 are reserved on the top plate. During the pouring of cable trench 18, the top plate is reserved with assembly holes for manhole 19, and the manhole 19 is fixed in the assembly hole.

[0032] When overhead power line cables are buried underground, workers above ground 1 assemble the transmission tower 22 on the pile foundation 10, and place multiple cables 15 of the transmission tower 22 into the underground cavity 16 of the cable well 14 by passing them sequentially through the corresponding fixing frame 24 and cable hole 25. Workers below ground 1 enter the cable trench 18 through the ladder 36 on the manhole 19, and then enter the underground cavity 16 of the cable well 14 through the cable trench 18. They then lift the upper clamping plate 17 and pass the multiple cables 15 sequentially through the multiple lower clamping plates 34. The clamping groove 35 continues to the next process, and the upper clamping plate 17 is lowered so that the multiple upper clamping grooves 33 on the upper clamping plate 17 cooperate with the corresponding lower clamping grooves 35 on the lower clamping plate 34 to clamp the cable 15, so as to achieve the spacing of the cable 15. At this time, the multiple temperature sensors 29 on the upper clamping plate 17 contact the corresponding cable 15 to realize the real-time temperature sensing. The cable 15 undergrounding operation is completed. The workers below the ground 1 climb out of the ground through the ladder 36 on the manhole 19 and fix the cover plate 21 with bolts to complete the undergrounding operation of the overhead line cable.

[0033] During the operation of cable 15, the temperature is monitored in real time by temperature sensor 29. If the monitored temperature of cable 15 is low, the control terminal starts the adjustable fan 5, but the power is set to a low level. The adjustable fan 5 generates suction, which draws outside air through the dust removal structure 3 and the drying structure 4 for dust removal and drying, and then discharges it into the ground cavity 16 through the air outlet 9. The air is then discharged through the first upper air outlet 20, achieving rapid airflow in the ground cavity 16 and carrying away the heat generated by cable 15 during operation. If the monitored temperature of cable 15 is high, the control terminal starts the adjustable fan 5, but the power is set to a high level, further accelerating the rapid airflow in the ground cavity 16, carrying away the heat generated by cable 15 during operation, improving the heat dissipation effect of cable 15, and preventing cable 15 from catching fire due to high temperature.

[0034] Example 2:

[0035] The difference between this embodiment and embodiment 1 is that: a smoke alarm 23 is fixedly connected to the top of the cavity 16 near the cable trench 18; a hidden groove 38 is provided inside the manhole 19 near the ladder 36; a pressure sensor 37 is fixedly connected to the top wall of the hidden groove 38; and a rectangular frame dry powder box 39 is movable inside the hidden groove 38. A dry powder inlet pipe 48 with a valve is fixedly connected to one side wall of the top of the rectangular frame dry powder box 39. The rectangular groove of the rectangular frame dry powder box 39 is located near the dry powder inlet pipe. A powder pump 47 is fixedly connected to one side of the pipe 48. The powder pump 47 has an inlet pipe 44 fixedly connected to the inlet end of the powder pump 47, which is fixedly connected to the rectangular frame dry powder box 39 and extends to the bottom end of the rectangular frame dry powder box 39. The powder pump 47 has an outlet pipe 46 fixedly connected to the outlet end of the powder pump 47. A spray pipe 45 is fixedly connected to and communicates with the other end of the outlet pipe 46 on the side of the rectangular groove away from the dry powder inlet pipe 48. Multiple nozzles 43 are fixedly connected at equal intervals on the side of the spray pipe 45 away from the outlet pipe 46. The powder pump 47 is remotely connected to the system control terminal.

[0036] Specifically, the movable lifting mechanism of the rectangular frame dry powder box 39 includes a drive motor 42 fixed to the bottom of the manhole 19 and a drive groove opened inside the manhole 19. A transmission screw 41 is placed in the drive groove. The bottom end of the transmission screw 41 is connected to the output shaft of the drive motor 42 through a coupling. The top end of the transmission screw 41 is connected to the manhole 19 through a bearing. A transmission block 40 with one end fixed to the rectangular frame dry powder box 39 is connected to the transmission screw 41 through a transmission nut. The drive motor 42 is remotely connected to the system control terminal.

[0037] During application, if the temperature of cable 15 exceeds the set value during the above process, the system control terminal will control the power supply of the corresponding cable 15 to be cut off. If a fire occurs due to rapid overheating during the power cut-off process of cable 15 due to abnormal temperature, the smoke alarm 23 will sense the smoke, triggering an alarm at the control terminal. Simultaneously, the drive motor 42 will be started, driving the output shaft to rotate in the reverse direction. The output shaft of the drive motor 42 will drive the transmission screw 41 to rotate in the reverse direction. During the reverse rotation of the transmission screw 41, the transmission block 40 will move downward on the transmission screw 41, driving the rectangular frame dry powder box 3. 9. Moving downwards, the rectangular frame dry powder box 39 drives the upper structure to move downwards until the pressure sensor 37 senses that the time of losing the pressure signal has reached the set value. Then, the control terminal controls the drive motor 42 to shut down and simultaneously controls the powder pump 47 to start. The powder pump 47 draws the dry powder in the rectangular frame dry powder box 39 into the spray pipe 45 through the powder inlet pipe 44 and the powder outlet pipe 46, and then sprays it out by multiple nozzles 43 to automatically extinguish the fire in the underground cavity 16. This prevents the fire from spreading and causing greater losses due to the long travel time for staff to arrive at the underground cavity 16.

[0038] Example 3

[0039] The difference between this embodiment and embodiment 2 is that: a filter chamber 12 is provided inside the ground cavity 16 near the heat dissipation cavity 7. A lower air inlet pipe 11 and a lower air outlet pipe 6, which are connected to the heat dissipation cavity 7, are fixedly connected from top to bottom on the partition plate 8 above the air outlet pipe 9. The lower air inlet pipe 11 is located between the drying structure 4 and the power adjustable fan 5. The lower air outlet pipe 6 is located below the power adjustable fan 5. The other end of the lower air outlet pipe 6 is fixedly connected to the partition plate 8 and connected to the filter chamber 12. An air purification structure 13 is fixedly connected inside the filter chamber 12. A second upper air outlet pipe 26 is fixedly connected above the air purification structure 13. The second upper air outlet pipe 26 passes through the cable well 14 and the ground 1 and extends to the ground 1. A solenoid valve 27 is assembled on the lower air inlet pipe 11, the lower air outlet pipe 6 and the second upper air outlet pipe 26 and is remotely connected to the system control terminal.

[0040] During application, the process continues until the smoke alarm 23 no longer detects smoke. After the fire is extinguished, the control terminal closes the solenoid valves 27 on the upper air inlet duct 2, the air outlet duct 9, and the first upper air outlet duct 20, and opens the solenoid valves 27 on the lower air inlet duct 11, the lower air outlet duct 6, and the second upper air outlet duct 26. The smoke generated during the fire and the powder floating in the air generated during the fire extinguishing are drawn into the filter chamber 12 through the lower air inlet duct 11 and the lower air outlet duct 6, and are filtered and purified by the air purification structure 13 before exiting through the second upper air outlet duct. The air is discharged through pipe 26 until the environment inside the underground cavity 16 is suitable. Then the solenoid valves 27 on the lower air inlet pipe 11, the lower air outlet pipe 6, and the second upper air outlet pipe 26 are closed. The solenoid valves 27 on the upper air inlet pipe 2, the air outlet pipe 9, and the first upper air outlet pipe 20 are opened. The drive motor 42 is controlled to drive in reverse so that the rectangular frame dry powder box 39 is reset. The bolts are removed to open the cover plate 21. The workers enter the cable trench 18 through the ladder 36 on the manhole 19, and then enter the underground cavity 16 of the cable well 14 through the cable trench 18 to inspect the cable 15.

Claims

1. A system for upgrading and transforming overhead power line cables to underground installations, characterized in that, include: The ground (1) and system control terminal are constructed. One side of the ground (1) is cast to form a cable well (14), and the other side is cast to form a cable trench (18). A partition (8) is fixed to the side of the cable well (14) away from the cable trench (18). The partition (8) divides the inside of the cable well (14) into a heat dissipation cavity (7) and an inlet cavity (16) from the side away from the cable trench (18) to the side closer to the cable trench (18). The heat dissipation cavity (7) is equipped with a power adjustable heat dissipation mechanism. A pile foundation (10) is set in the middle of the inlet cavity (16). The bottom end of the pile foundation (10) extends through the cable well (14) and is fixed to the ground (1). The top end of the pile foundation (10) extends through the cable well (14) and is fixed to the top end of the ground (1). A power transmission tower (22) is fixed to the top of the pile foundation (10). Multiple fixed frames (24) are fixed at equal intervals along the circumference of the power transmission tower (22). Multiple cables (15) are fixed to its power transmission end. Cable holes (25) are provided on the surface (1) and cable well (14) at the positions corresponding to the cable (15). A temperature-sensitive spacing clamping mechanism is installed inside the cable trench (18). Multiple cables (15) pass through the corresponding fixing frame (24) and cable hole (25) in sequence and extend into the ground cavity (16) while passing through the temperature-sensitive spacing clamping mechanism to enter the next adjacent system. A manhole (19) connected to the cable trench (18) is fixed above the ground (1) and inside the manhole (19). A ladder (36) is fixed inside the manhole (19), and a cover plate (21) is bolted to its top. A first upper air outlet pipe (20) connected to the manhole (19) is fixed to the top of the cover plate (21). An electric adjustment mechanism is installed on the first upper air outlet pipe (20). The power adjustable heat dissipation mechanism, the temperature-sensitive spacing clamping mechanism and the electric adjustment mechanism are respectively remotely connected to the system control terminal. The power adjustable heat dissipation mechanism includes an upper air inlet pipe (2), a dust removal structure (3), a drying structure (4), and a power adjustable fan (5) fixedly connected to both sides of the heat dissipation cavity (7) from top to bottom, and an air outlet pipe (9) fixedly connected to the partition plate (8) below the power adjustable fan (5) and connecting the heat dissipation cavity (7) and the ground cavity (16). The upper air inlet pipe (2) and the air outlet pipe (9) are equipped with an electric adjustment mechanism, which is remotely connected to the system control terminal. The temperature-sensing spacing clamping mechanism includes a lower clamping plate (34) fixed to the bottom of the cable trench (18) and an upper clamping plate (17) movably placed above the lower clamping plate (34). The upper clamping plate (17) is provided with movable placement mechanisms at both ends. The top of the lower clamping plate (34) is provided with multiple lower clamping grooves (35) at equal intervals. The bottom of the upper clamping plate (17) is provided with multiple upper clamping grooves (33) corresponding to the multiple lower clamping grooves (35) at equal intervals. A clamping hole is formed between the upper clamping groove (33) and the corresponding lower clamping groove (35). The top of the upper clamping plate (17) is provided with multiple assembly through holes (30) corresponding to and connected to the multiple upper clamping grooves (33) at equal intervals. A temperature sensor (29) is fixed inside the assembly through hole (30). The temperature sensor (29) is remotely connected to the system control terminal. The electric regulating mechanism is a solenoid valve (27), which is remotely connected to the system control terminal. A filter chamber (12) is provided inside the ground cavity (16) on the side near the heat dissipation cavity (7). A lower air inlet pipe (11) and a lower air outlet pipe (6) communicating with the heat dissipation cavity (7) are fixedly connected from top to bottom on the partition plate (8) above the air outlet pipe (9). The lower air inlet pipe (11) is located between the drying structure (4) and the power adjustable fan (5). The lower air outlet pipe (6) is located below the power adjustable fan (5). The other end of the lower air outlet pipe (6) is fixedly connected to the partition plate (8). It is connected to the filter chamber (12), and an air purification structure (13) is fixed inside the filter chamber (12). A second upper air outlet pipe (26) is fixed above the air purification structure (13). The second upper air outlet pipe (26) passes through the cable well (14) and the ground (1) and extends to the ground (1). The solenoid valve (27) is mounted on the lower air inlet pipe (11), the lower air outlet pipe (6), and the second upper air outlet pipe (26) and is remotely connected to the system control terminal.

2. The overhead line cable undergrounding construction and upgrading system according to claim 1, characterized in that: The movable placement mechanism at both ends of the upper clamping plate (17) includes two movable blocks (32) symmetrically fixed on the upper clamping plate (17) and two movable slots symmetrically opened on the inner wall of the cable trench (18) along the X-direction central axis of the cable trench (18). A fixed rod (31) is fixedly connected in the movable slot. The two movable blocks (32) extend into the corresponding movable slots and are movably sleeved on the fixed rod (31). The fixed rod (31) is sleeved with connecting springs (28) at both ends fixed to the top wall of the movable slot and the top wall of the movable block (32) respectively.

3. The overhead line cable undergrounding construction and upgrading system according to claim 1, characterized in that: A smoke alarm (23) is fixedly attached to the top of the underground cavity (16) near the cable trench (18). A hidden groove (38) is provided inside the manhole (19) near the ladder (36). A pressure sensor (37) is fixedly attached to the top wall of the hidden groove (38). A rectangular frame dry powder box (39) is movable inside the hidden groove (38). A movable lifting mechanism is provided on the side of the rectangular frame dry powder box (39). A dry powder inlet pipe (48) with a valve is fixedly attached to one side wall of its top. The rectangular groove of the rectangular frame dry powder box (39) is located near the dry powder inlet pipe. 48) A powder pump (47) is fixedly connected to one side. The powder pump (47) has an inlet pipe (44) fixedly connected to the inlet end of the powder pump (47) and extending to the bottom end of the rectangular frame dry powder box (39). The powder pump (47) has an outlet pipe (46) fixedly connected to the outlet end. The side of the rectangular groove away from the dry powder inlet pipe (48) has a spray pipe (45) fixedly connected to and connected to the other end of the outlet pipe (46). The spray pipe (45) has multiple nozzles (43) fixedly connected at equal intervals on the side away from the outlet pipe (46). The powder pump (47) is remotely connected to the system control terminal.

4. The overhead line cable undergrounding construction and upgrading system according to claim 3, characterized in that: The movable lifting mechanism of the rectangular frame dry powder box (39) includes a drive motor (42) fixed to the bottom of the manhole (19) and a drive groove opened inside the manhole (19). A transmission screw (41) is placed in the drive groove. The bottom end of the transmission screw (41) is connected to the output shaft of the drive motor (42) through a coupling. The top end of the transmission screw (41) is connected to the manhole (19) through a bearing. A transmission block (40) with one end fixed to the rectangular frame dry powder box (39) is connected to the transmission screw (41) through a transmission nut. The drive motor (42) is remotely connected to the system control terminal.

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