Buried power pipeline mounting structure

Abstract

The invention relates to the technical field of power pipeline installation, in particular to a buried power pipeline installation structure which comprises at least two butt-joint connecting pipes, a connecting sleeve is arranged at the butt-joint position of the connecting pipes in a sleeving mode, and a centering support is arranged in the connecting sleeve. The centering supports are fixed to the ends of the connecting pipes, the center lines of the centering supports coincide with the center lines of the connecting pipes, a flexible connecting piece is arranged in the middle of the connecting sleeve and used for connecting the centering supports on the two sections of connecting pipes, and the center line of the flexible connecting piece coincide with the center lines of the connecting pipes through the centering supports. The inner wall of the flexible connecting piece is flush with the inner wall of the connecting pipe. According to the invention, the cable can easily pass through the connection part of the power pipeline.

Description

Technical Field

[0001] This application relates to the technical field of power pipeline installation, and more particularly to an underground power pipeline installation structure. Background Technology

[0002] Power conduits are pipes installed outside cables to protect them and extend their service life. MPP power conduits and CPVC power conduits can be used. Some power conduits need to be buried underground to facilitate cable insertion and provide a better insulation environment for the cables. Power conduits are required to have high ring stiffness, high strength, and strong resistance to pressure and shock.

[0003] A method for burying power pipelines is disclosed in the related technology, which includes first excavating a cable trench on the ground, then laying the power pipeline. During the laying process, adjacent sections of the power pipeline are butt-welded by hot fusion. Then, supports are installed on the power pipeline to make the power pipeline layout more neat. Vertical shafts are set at intervals to facilitate later maintenance and cable installation. Finally, the outside of the power pipeline is wrapped with concrete to improve the service life and compressive strength of the power pipeline.

[0004] However, in the above structure, the connection of the power pipe is prone to forming a rolled edge inside through welding. When the cable is installed, the rolled edge blocks the end of the cable, making the cable installation difficult. Summary of the Invention

[0005] In order to facilitate the laying of cables through the connection points of power conduits, this application provides an underground power conduit installation structure.

[0006] This application provides a buried power pipeline installation structure, which adopts the following technical solution: An underground power pipeline installation structure includes at least two connecting pipe sections. A connecting sleeve is fitted at the joint of the connecting pipe sections. A centering bracket is provided inside the connecting sleeve. The centering bracket is fixed to the end of the connecting pipe, and the center line of the centering bracket coincides with the center line of the connecting pipe. A flexible connector is provided in the middle of the connecting sleeve. The flexible connector is used to connect the centering brackets on the two connecting pipe sections, and the center line of the flexible connector coincides with the center line of the connecting pipe through the centering bracket. The inner wall of the flexible connector is flush with the inner wall of the connecting pipe.

[0007] By adopting the above technical solution, in use, the two connected pipes form a power conduit. A connecting sleeve is fitted at the connection point of the pipes, and the centering bracket inside the connecting sleeve is used to limit the position of the pipes within the sleeve. At the same time, a flexible connector is placed against the end faces of the two pipes, allowing the flexible connector to directly connect the two pipes. The inner wall of the flexible connector is flush with the inner wall of the pipes. The flexible connector connects the two pipes together, so that when the cable passes through the connection point of the two pipes, the flexible connector provides a transition, making it easier to pass through the connection point of the power conduit.

[0008] Preferably, the flexible connector includes two toothed rings and a spring disposed between the two toothed rings. Each toothed ring includes an integrally formed circular portion, a toothed portion, and a connecting portion. One side of the circular portion is used to abut against the end face of the connecting tube. The connecting portion is located on the side of the circular portion closer to the connecting tube and is used to connect to the centering bracket. The toothed portion is located on the side of the circular portion away from the connecting portion. The two toothed rings are arranged opposite each other, and the toothed portions of the two toothed rings are staggered. The two ends of the spring abut against the two toothed rings respectively.

[0009] By adopting the above technical solution, the toothed parts of the two toothed rings are misaligned, so that the distance between the two toothed rings can be easily adjusted through the toothed parts, and the toothed parts can be connected so that the cable can pass smoothly between the two connecting pipes. At the same time, the two ends of the spring abut against the two toothed rings, so that the toothed rings can be connected with the connecting pipes to prevent the gap between the toothed rings and the connecting pipes from obstructing the cable.

[0010] Preferably, the connecting sleeve has a fixed inner ring in the middle, the fixed inner ring is slidably connected to the toothed part in the middle and the center line of the fixed inner ring coincides with the center line of the toothed ring; the fixed inner ring has a through hole and the spring passes through the through hole.

[0011] By adopting the above technical solution, the toothed part is slidably connected to the middle of the fixed inner ring, so that the center line of the toothed ring is aligned with the center line of the connecting pipe through the fixed inner ring, thereby ensuring the alignment of the toothed ring and the connecting pipe. The spring is provided in the through hole to fix the position of the spring and prevent the spring from moving or falling off.

[0012] Preferably, the centering bracket has a first conical surface on the outer side wall of one end facing the toothed ring, and the connecting part has a second conical surface that mates with the first conical surface, and the center line of the first conical surface coincides with the center line of the centering bracket.

[0013] By adopting the above technical solution, a first conical surface is opened on the centering bracket and a second conical surface is opened on the connecting part. When the centering bracket is inserted into the connecting part, the second conical surface of the connecting part cooperates with the first conical surface of the centering bracket, so that the center line of the centering bracket coincides with the center line of the toothed ring, ensuring the accurate connection between the toothed ring and the connecting pipe.

[0014] Preferably, the connecting sleeve is provided with pressure rings at both ends, the pressure rings are threaded to the connecting sleeve and extend radially toward the inside of the connecting sleeve near the end of the connecting sleeve to block the position of the centering bracket.

[0015] By adopting the above technical solution, the pressure rings are set at both ends of the connecting sleeve. The pressure rings extend into the inside of the connecting sleeve and block the position of the centering bracket, so as to prevent the centering bracket from coming out of the connecting sleeve after it is installed inside the connecting sleeve.

[0016] Preferably, a compression spring is sleeved on the outside of the connecting pipe. One end of the compression spring is used to abut against the centering bracket, and the other end is used to abut against the pressure ring. The centering bracket is located in the middle position of the centering bracket's moving area under the combined force of the compression spring and the spring.

[0017] By adopting the above technical solution, during the installation of the connecting pipe, the force of the compression spring and the force of the spring are both applied to the centering bracket, so that the centering bracket can be in the middle position of the movable area, ensuring that the connecting pipe can move freely in the event of subsequent elongation or contraction.

[0018] Preferably, an annular groove is formed on the outer peripheral wall of the centering bracket, and a sealing strip is provided in the annular groove. The sealing strip is used to abut against the inner wall of the connecting sleeve.

[0019] By adopting the above technical solution, a sealing strip is installed in the annular groove. The sealing strip is used to separate the area inside the connecting pipe from the area outside the connecting sleeve, thereby reducing the connection between the area inside and outside the connecting pipe by groundwater and reducing the insulation of the connecting pipe.

[0020] Preferably, a connecting frame is provided on the outer wall of the connecting sleeve, the cross-section of the connecting frame is square, and a dovetail groove is provided on the peripheral wall of the connecting frame.

[0021] By adopting the above technical solution, the cross-section of the connecting frame is set to a square. When installing multiple connecting pipes, the dovetail grooves of the connecting frames on the multiple connecting pipes are arranged opposite each other, so that suitable clips are inserted into the dovetail grooves for fixing.

[0022] Preferably, the centering bracket is connected to a detachable movable component, the movable component including a central tube and an end face ring. The central tube is used to pass through the end of the connecting tube. The centering bracket is connected to the end face ring and the centering bracket is spaced apart from the outer wall of the central tube. The inner wall of the centering bracket near the end face ring is threaded, and a tap is embedded at the other end.

[0023] By adopting the above technical solution, the movable part includes a central tube and an end face ring. The central tube is first inserted into the connecting tube so that the center line of the central tube coincides with the center line of the connecting tube. Then, the centering bracket is connected to the central tube so that the center line of the centering bracket coincides with the center line of the connecting tube. This makes it convenient for the tap connected on the centering bracket to open threads on the outer wall of the connecting tube. The opened threads are used to connect the centering bracket and can also ensure that the center line of the centering bracket coincides with the center of the connecting tube.

[0024] Preferably, a positioning rod is fixedly provided on the side of the end face ring facing the centering bracket, the centering bracket is provided with a positioning hole that cooperates with the positioning rod, and a plurality of force-applying rods parallel to the central tube are fixedly provided on the end of the end face ring away from the positioning rod.

[0025] By adopting the above technical solution, the centering bracket is connected to the positioning rod through the positioning hole. When the centering bracket is installed on the connecting pipe, the movable part can be pulled out directly along the length of the connecting pipe, making it convenient to remove the movable part from the centering bracket.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. A flexible connector is placed against the end faces of two connecting pipes, allowing the flexible connector to directly connect the two connecting pipes. The inner wall of the flexible connector is flush with the inner wall of the connecting pipe. The flexible connector connects the two connecting pipes together, so that when the cable passes through the connection of the two connecting pipes, the flexible connector can provide a transition, and thus it can pass through the connection of the power pipeline more easily. 2. When the centering bracket is inserted into the connecting part, the second conical surface of the connecting part mates with the first conical surface of the centering bracket, thereby aligning the centerline of the centering bracket with the centerline of the toothed ring, ensuring accurate connection between the toothed ring and the connecting pipe; 3. The forces of the compression spring and the spring are both applied to the centering bracket so that the centering bracket can be in the middle position of the moving area, ensuring that the connecting pipe can move freely in the event of subsequent elongation or contraction. 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 showing the position of the flexible connector in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the connecting sleeve cut open in an embodiment of this application; Figure 4 This is a schematic diagram of the connection between the centering bracket and the toothed ring in an embodiment of this application; Figure 5 This is a schematic diagram of the connection structure of the moving parts in the embodiments of this application; Figure 6 This is an exploded view of the connection structure between the movable component and the centering bracket in an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Connecting pipe; 2. Connecting sleeve; 21. Connecting frame; 22. Dovetail groove; 23. Fixed inner ring; 24. Through hole; 3. Centering bracket; 31. First conical surface; 32. Ring groove; 33. Sealing strip; 34. Positioning hole; 4. Flexible connector; 41. Toothed ring; 411. Circular part; 412. Toothed part; 413. Connecting part; 414. Second conical surface; 415. Inclined surface; 42. Spring; 5. Pressure ring; 6. Compression spring; 7. Moving part; 71. Central tube; 72. End face ring; 73. Positioning rod; 74. Force application rod; 8. Tap. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses an underground power pipeline installation structure, with reference to... Figure 1 and Figure 2 It includes at least two connecting pipe sections 1, and a connecting sleeve 2 is provided at the joint position of the two connecting pipe sections 1. The connecting sleeve 2 is provided with a centering bracket 3 fixed to the end of the connecting pipe 1. The ends of the two connecting pipe sections 1 are aligned by the two centering brackets 3. A flexible connector 4 is provided between the ends of the two connecting pipe sections 1. The inner diameter of the flexible connector 4 is the same as the inner diameter of the connecting pipe 1, so that the flexible connector 4 can splice the two connecting pipe sections 1, thereby reducing the obstruction of the cable when the cable is inserted into the connecting pipe 1 and facilitating the cable to pass through the joint of the two connecting pipe sections 1.

[0031] refer to Figure 1 A connecting frame 21 is provided in the middle of the outer side of the connecting sleeve 2. The connecting frame 21 is set in a square cross-section. When multiple power pipes are needed, the two connecting pipes 1 are connected through the connecting frame 21. The two connecting frames 21 are in the same position. At the same time, dovetail grooves 22 are opened on the four side walls of the connecting frame 21. The two connecting frames 21 are attached to each other. A locking block is installed in the two opposite dovetail grooves 22 to fix the connecting frame 21, so that multiple connecting pipes 1 can be fixed to each other.

[0032] refer to Figure 2 and Figure 3The flexible connector 4 includes two toothed rings 41 and multiple springs 42 abutting between the two toothed rings 41. Each toothed ring 41 includes a circular ring portion 411, a toothed portion 412, and a connecting portion 413. One side of the circular ring portion 411 abuts against the end face of the connecting pipe 1. The side of the circular ring portion 411 away from the connecting pipe 1 is used to fix the toothed portion 412, and the outer edge of the other side is used to fix the connecting portion 413. The circular ring portion 411, the toothed portion 412, and the connecting portion 413 are integrally formed. The toothed portion 412 is strip-shaped and parallel to the axial direction of the connecting pipe 1. Multiple toothed portions 412 are evenly arranged along the circumference of the circular ring portion 411, with 20-40 toothed portions arranged depending on the diameter of the connecting pipe 1. The side of the toothed portion 412 closest to the inner side of the circular ring portion 411 is flush with the inner surface of the circular ring portion 411, and its radius is equal to the radius of the connecting pipe 1. When the two toothed rings 41 are connected, the toothed portions 412 of the two toothed rings 41 face each other and are staggered, so that the two toothed rings 41 are smoothly connected through the toothed portions 412, so that after the cable enters the position of the toothed rings 41, the two toothed portions 412 cooperate to smoothly pass the cable through the connection of the connecting pipe 1.

[0033] refer to Figure 2 and Figure 3 A fixing inner ring 23 is provided in the middle of the inner part of the connecting sleeve 2. The fixing inner ring 23 is integrally formed with the connecting sleeve 2. The fixing inner ring 23 has multiple through holes 24 that penetrate vertically through the fixing inner ring 23. The spring 42 is placed in the through holes 24. The length direction of the spring 42 is parallel to the length direction of the toothed part 412, so that the two ends of the spring 42 abut against the annular part 411 of the two toothed rings 41 respectively. The force of the spring 42 is used to move the two toothed rings 41 in a direction away from each other. At the same time, the inner diameter of the fixing inner ring 23 is equal to the diameter of the arc formed by the outer wall of the toothed part 412, so that the toothed rings 41 can be inserted into the fixing inner ring 23. Meanwhile, the center line of the toothed rings 41 is kept on the same straight line as the center line of the connecting sleeve 2 under the action of the fixing inner ring 23.

[0034] refer to Figure 2 and Figure 4The centering bracket 3 is annular and fixed to the end of the connecting pipe 1. The center line of the centering bracket 3 is on the same straight line as the center line of the connecting pipe 1. The centering bracket 3 is used to connect with the connecting part 413 of the toothed ring 41. A chamfer is provided on the outer edge of the end face of the centering bracket 3 near the end of the connecting pipe 1 to form a first conical surface 31. The center line of the first conical surface 31 coincides with the center line of the centering bracket 3. A second conical surface 414 is provided on the connecting part 413 to cooperate with the first conical surface 31. The second conical surface 414 is located inside the connecting part 413, so that the first conical surface 31 and the second conical surface 414 are parallel and have the same taper. When the centering bracket 3 and the connecting pipe 1 are simultaneously inserted into the connecting sleeve 2, the end of the centering bracket 3 abuts against the end face of the connecting part 413 on the toothed ring 41. The first conical surface 31 and the second conical surface 414 then cooperate to ensure that the centerline of the centering bracket 3 and the centerline of the connecting pipe 1 are aligned, thereby making the inner wall of the flexible connector 4 flush with the inner wall of the connecting pipe 1. When the cable enters the connection point of the connecting pipe 1, it can pass smoothly through the flexible connector 4. Simultaneously, when the two connecting pipes 1 undergo thermal expansion and contraction, the connection point of the connecting pipe 1 is accommodated by the expansion and contraction of the flexible connector 4 to prevent the connection point of the connecting pipe 1 from bursting and causing insulation failure.

[0035] refer to Figure 4 An inclined surface 415 is formed by chamfering on the inner surface of the toothed portion 412, which is away from the annular portion 411 and close to the toothed portion 412. The inclined surface 415 is used to avoid the cable end from abutting against the end face of the toothed portion 412 when the cable diameter is larger than the inner diameter of the connecting pipe 1. An annular groove 32 is formed on the outer peripheral wall of the centering bracket 3, and a sealing strip 33 is provided in the annular groove 32. The sealing strip 33 is used to seal the outer periphery of the centering bracket 3 with the inner wall of the connecting sleeve 2. Since the flexible connector 4 makes the center line of the centering bracket 3 coincide with the center line of the connecting sleeve 2, the sealing strip 33 can better seal the centering bracket 3 and the connecting sleeve 2. At the same time, the first conical surface 31 is on the centering bracket 3, which makes it easier to insert the connecting pipe 1 into the connecting sleeve 2. As a result, the assembly accuracy of the inner diameter of the connecting sleeve 2 and the outer peripheral wall of the centering bracket 3 can be set to be higher, which further reduces the inconvenience of cable passage caused by the unevenness of the ends when two adjacent connecting pipes 1 are connected.

[0036] refer to Figure 2A pressure ring 5 is provided at both ends of the connecting sleeve 2. The pressure ring 5 is threaded to the connecting sleeve 2 and extends radially inward at the end of the connecting sleeve 2 so that it can block the outside of the centering bracket 3, preventing the centering bracket 3 installed in the connecting sleeve 2 from coming out of the connecting sleeve 2. A compression spring 6 is sleeved on the connecting pipe 1. One end of the compression spring 6 abuts against the centering bracket 3, and the other end abuts against the pressure ring 5. The force of the compression spring 6 on the centering bracket 3 is opposite to the force of the spring 42 on the centering bracket 3. When the pressure ring 5 is installed in place, the centering bracket 3 is in the middle position of the movable area of ​​the centering bracket 3 under the action of the compression spring 6 and the spring 42. That is, the newly installed centering bracket 3 can move along the connecting sleeve 2 when the connecting pipe 1 expands or contracts. The connecting pipe 1 is buried underground. If the compression spring 6 is in a state of underground erosion and is damaged prematurely, the connecting pipe 1 can still expand and contract normally after the compression spring 6 loses its elasticity.

[0037] refer to Figure 5 and Figure 6 A movable component 7 for mounting the centering bracket 3 is connected to the centering bracket 3. The movable component 7 includes a central tube 71 and an end face ring 72. The outer diameter of the central tube 71 is equal to the inner diameter of the connecting pipe 1, and the length of the central tube 71 is greater than the length of the centering bracket 3. The end face ring 72 is fixed to one end of the central tube 71 and is coaxially arranged with the central tube 71. A chamfer is formed on the outer wall of the side of the central tube 71 away from the end face ring 72 to facilitate the insertion of the central tube 71 into the connecting pipe 1. The centering bracket 3 is detachably connected to the end face ring 72, and the inner wall of the centering bracket 3 is spaced apart from the outer wall of the central tube 71, with the distance between the two being less than the wall thickness of the connecting pipe 1. A thread is formed on the inner wall of the end of the centering bracket 3 facing the end face ring 72, and a tap 8 is embedded on the inner wall of the end of the centering bracket 3 away from the end face ring 72. The tap 8 is fixedly connected to the centering bracket 3. First, install the movable part 7 into the connecting pipe 1, then connect the centering bracket 3 to the movable part 7. After ensuring that the center of the centering bracket 3 coincides with the center of the connecting pipe 1, rotate the centering bracket 3 so that the centering bracket 3 is threaded onto the connecting pipe 1 under the action of the tap 8, and then fix the centering bracket 3 onto the connecting pipe 1 until the end face ring 72 abuts against the end of the connecting pipe 1.

[0038] refer to Figure 6Multiple positioning rods 73 are fixedly mounted on the end face ring 72 facing the centering bracket 3. The length direction of the positioning rods 73 is parallel to the central tube 71. Multiple positioning holes 34 are opened on the centering bracket 3 facing the end face ring 72. The positioning rods 73 correspond one-to-one with the positioning holes 34, and the positioning rods 73 are inserted into the positioning holes 34 to connect the positioning rods 73 to the centering bracket 3. Multiple force-applying rods 74 parallel to the central tube 71 are fixedly mounted on the side of the end face ring 72 away from the positioning rods 73. The multiple force-applying rods 74 are used to facilitate the rotation of the movable part 7. In use, first insert the center tube 71 into the connecting tube 1, then connect the centering bracket 3 to the positioning rod 73. By placing a rod-shaped object between the two force-applying rods 74, the movable rod is pried and rotated, so that the centering bracket 3 is threaded onto the connecting tube 1 until the end face ring 72 abuts against the end face of the connecting tube 1. Then, pull the movable part 7 out of the connecting tube 1, insert the end of the connecting tube 1 with the centering bracket 3 into the connecting sleeve 2, so that the connecting tube 1 is connected through the connecting sleeve 2.

[0039] 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 buried power pipeline installation structure, characterized in that: The device includes at least two connecting pipes (1) that are joined together. A connecting sleeve (2) is fitted at the joint of the connecting pipes (1). A centering bracket (3) is provided inside the connecting sleeve (2). The centering bracket (3) is fixed to the end of the connecting pipe (1) and the center line of the centering bracket (3) coincides with the center line of the connecting pipe (1). A flexible connector (4) is provided in the middle of the connecting sleeve (2). The flexible connector (4) is used to connect the centering brackets (3) on the two connecting pipes (1) and the center line of the flexible connector (4) coincides with the center line of the connecting pipe (1) through the centering bracket (3). The inner wall of the flexible connector (4) is flush with the inner wall of the connecting pipe (1).

2. The underground power pipeline installation structure according to claim 1, characterized in that: The flexible connector (4) includes two toothed rings (41) and a spring (42) disposed between the two toothed rings (41). The toothed ring (41) includes an integrally formed circular ring portion (411), a toothed portion (412), and a connecting portion (413). One side of the circular ring portion (411) is used to abut against the end face of the connecting tube (1). The connecting portion (413) is located on the side of the circular ring portion (411) close to the connecting tube (1) and is used to connect the centering bracket (3). The toothed portion (412) is located on the side of the circular ring portion (411) away from the connecting portion (413). The two toothed rings (41) are arranged opposite each other and the toothed portions (412) of the two toothed rings (41) are staggered. The two ends of the spring (42) abut against the two toothed rings (41) respectively.

3. The underground power pipeline installation structure according to claim 2, characterized in that: The connecting sleeve (2) is provided with a fixed inner ring (23) in the middle, and the fixed inner ring (23) is slidably connected to the toothed part (412) in the middle, and the center line of the fixed inner ring (23) coincides with the center line of the toothed ring (41); the fixed inner ring (23) is provided with a through hole (24), and the spring (42) passes through the through hole (24).

4. The underground power pipeline installation structure according to claim 3, characterized in that: The centering bracket (3) has a first conical surface (31) on the outer side wall of one end facing the toothed ring (41), and the connecting part (413) has a second conical surface (414) that mates with the first conical surface (31). The center line of the first conical surface (31) coincides with the center line of the centering bracket (3).

5. The underground power pipeline installation structure according to claim 2, characterized in that: The connecting sleeve (2) is provided with pressure rings (5) at both ends. The pressure rings (5) are threaded to the connecting sleeve (2) and extend radially toward the inside of the connecting sleeve (2) near the end of the connecting sleeve (2) to block the position of the centering bracket (3).

6. The underground power pipeline installation structure according to claim 5, characterized in that: The outer side of the connecting pipe (1) is fitted with a compression spring (6). One end of the compression spring (6) is used to abut against the centering bracket (3), and the other end is used to abut against the pressure ring (5). The centering bracket (3) is located in the middle position of the moving area of ​​the centering bracket (3) under the combined force of the compression spring (6) and the spring (42).

7. The underground power pipeline installation structure according to claim 1, characterized in that: The centering bracket (3) has an annular groove (32) on its outer peripheral wall, and a sealing strip (33) is provided in the annular groove (32). The sealing strip (33) is used to abut against the inner wall of the connecting sleeve (2).

8. The underground power pipeline installation structure according to claim 1, characterized in that: A connecting frame (21) is provided on the outer wall of the connecting sleeve (2). The cross-section of the connecting frame (21) is square, and a dovetail groove (22) is provided on the peripheral wall of the connecting frame (21).

9. The underground power pipeline installation structure according to claim 1, characterized in that: The centering bracket (3) is connected to a detachable movable part (7), which includes a central tube (71) and an end face ring (72). The central tube (71) is used to pass through the end of the connecting tube (1). The centering bracket (3) is connected to the end face ring (72), and the centering bracket (3) is spaced apart from the outer wall of the central tube (71). The centering bracket (3) has a thread on the inner wall of one end near the end face ring (72), and a tap (8) is embedded at the other end.

10. The underground power pipeline installation structure according to claim 9, characterized in that: A positioning rod (73) is fixedly provided on the side of the end face ring (72) facing the centering bracket (3). The centering bracket (3) is provided with a positioning hole (34) that cooperates with the positioning rod (73). A plurality of force-applying rods (74) parallel to the central tube (71) are fixedly provided on the end of the end face ring (72) away from the positioning rod (73).

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