Steel pipe pole center connecting structure and electric single-pole tower

Abstract

The application relates to the technical field of electric power line single-pole tower, in particular to a steel pipe pole center connecting structure and an electric power single-pole tower, which are used for connecting a first pipe body and a second pipe body and comprise the following: a guide piece arranged in the second pipe body and matched with the end of the first pipe body; a protrusion arranged on the inner wall of the first pipe body and matched with a guide groove formed on the guide piece; a connecting shaft coaxially arranged with the second pipe body and slidably matched with a fixing ring arranged in the first pipe body; and a reinforcing mechanism comprising a lifting assembly and a spacing locking assembly, wherein the lifting assembly can drive the connecting shaft to move towards the spacing locking assembly and has two movement strokes, namely stroke A and stroke B; when the connecting shaft is in stroke A, the connecting shaft reaches a locking state; and when the connecting shaft is in stroke B, the connecting shaft is triggered to be unlocked, is separated from the spacing locking assembly and is reset, so that the structural strength of the single-pole tower is improved.

Description

Technical Field

[0001] This invention relates to the field of power line single-pole tower technology, specifically a steel pipe pole center connection structure and a power line single-pole tower. Background Technology

[0002] Single-pole towers are the most commonly used cable supports on high-voltage transmission lines. Based on their location and function within the line, single-pole towers include straight-line towers, branch towers, tension towers, and crossing towers.

[0003] Due to limitations in manufacturing processes (length restrictions of bending equipment) and transportation and installation, existing power poles are typically designed in a segmented manner during production. This means that the power pole is designed as two or even three sections, which are then assembled using a modular assembly method when needed.

[0004] During the use of a single-pole tower, under normal circumstances, the loads on both sides are in a roughly balanced state. However, in extreme weather conditions, such as snow and ice, the load on the conductors on both sides of the single-pole tower increases due to the accumulation of snow. In this case, the loads on both sides of the single-pole tower can still be in a balanced state, but as the snow and ice slowly melt, the loads on both sides of the single-pole tower will change and differ significantly. At this time, the connection of the single-pole tower is only connected by bolts, which poses a risk of breakage. Summary of the Invention

[0005] The purpose of this invention is to provide a steel pipe pole center connection structure and a single power pole tower to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A steel pipe pole center connection structure for connecting a first pipe body and a second pipe body, comprising:

[0008] A guide member is disposed inside the second tube body. The guide member cooperates with the end of the first tube body and can guide the first tube body and the second tube body to be coaxial.

[0009] Multiple sets of protrusions are installed circumferentially and equidistantly on the inner wall of the first tube. The protrusions cooperate with the guide grooves formed on the guide to align the bolt holes on the two flanges connecting the first tube and the second tube.

[0010] A connecting shaft is coaxially arranged with the second tube body, and the connecting shaft is slidably engaged with a fixing ring arranged inside the first tube body;

[0011] A reinforcement mechanism is disposed between the first tube body and the second tube body. The reinforcement mechanism includes a lifting component and an interval locking component. The lifting component can drive the connecting shaft to move toward the interval locking component and has two movement strokes, namely stroke A and stroke B. When the connecting shaft is in stroke A, the connecting shaft reaches the locked state. When the connecting shaft is in stroke B, it triggers unlocking, disengages from the interval locking component, and resets.

[0012] As a further aspect of the present invention: the upper end of the guide member is formed with an annular guide surface;

[0013] The guide groove includes a vertical groove and an inclined groove formed on the guide member. The vertical groove and the inclined groove are smoothly connected, and two inclined guide surfaces are provided at the end of the vertical groove away from the inclined groove.

[0014] As a further embodiment of the present invention: the lifting assembly includes a follower plate disposed in the second tube, two transmission wheels are rotatably mounted on the follower plate, and a transmission belt is sleeved between the two transmission wheels;

[0015] One of the drive wheels has a shaft that passes through the second tube and is provided with a drive unit, and the shaft of the drive wheel is connected to a lifting structure between the follower plate and the second tube.

[0016] The lifting assembly also includes a lifting member disposed on the follower plate, and the lifting member is connected to the transmission belt through a fitting structure.

[0017] As a further embodiment of the present invention: the fitting structure includes a slider rotatably mounted on the transmission belt, the slider being slidably connected to a groove disposed on the lifting member and perpendicular to the length direction of the lifting member;

[0018] The follower plate is also provided with a guide sleeve, which is slidably connected to the lifting member.

[0019] As a further embodiment of the present invention: the lifting structure includes a cam rotatably mounted on the follower plate, the shaft of the cam being connected to the shaft of the transmission wheel via a belt, and the cam engaging with an abutment roller rotatably mounted on the second tube body;

[0020] Two guide plates are also fixedly installed inside the second tube, and the two guide plates are slidably connected to the follower plate.

[0021] As a further embodiment of the present invention: the interior of the connecting shaft is a hollow structure;

[0022] The interval locking assembly includes a plurality of hinge rods rotatably mounted on the upper end of the connecting shaft. The end of each hinge rod away from the connecting shaft has a hook portion, and a pull rod is rotatably mounted on the hinge rod. The end of the pull rod away from the hinge rod is connected to an elastic structure disposed on the connecting shaft.

[0023] The interval locking assembly also includes an expansion locking structure disposed on the first tube body and adapted to the hook portion.

[0024] As a further embodiment of the present invention: the elastic structure includes a first vertical shaft that is movably disposed through the connecting shaft, one end of the first vertical shaft is provided with a connecting plate, and the other end is rotatably connected to the pull rod;

[0025] A first spring is also fitted on the first vertical shaft. One end of the first spring is connected to the connecting plate, and the other end is connected to the inner wall of the connecting shaft.

[0026] A second limiting ring is also provided on the first vertical shaft.

[0027] As a further embodiment of the present invention: the expansion and locking structure includes a connector fixedly installed on the first tube body, a second vertical shaft is installed on the connector, a lower cone is provided at the end of the second vertical shaft away from the connector, and an upper cone is slidably installed on the second vertical shaft, the upper cone being adapted to a first limiting ring provided on the second vertical shaft;

[0028] A second spring is also fitted onto the second vertical shaft, and the two ends of the second spring are respectively connected to the upper cone and the lower cone.

[0029] A single power pole includes the aforementioned steel pipe pole central connection structure.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] By using guide components, the process of connecting the first and second pipe bodies is made easier. After the first and second pipe bodies are connected, the bolt holes on the two flanges connecting the first and second pipe bodies will automatically align, making it easier for workers to install bolts. At the same time, when the protrusion moves to the end of the inclined groove, if the first pipe body tilts, it needs to overcome its own weight. That is, the gravity of the first pipe body can have a certain inhibitory effect on the tilting of the first pipe body, thereby improving the safety of the connection process.

[0032] The reinforcement mechanism allows for a certain height difference between two adjacent lifting and lowering processes of the connecting shaft. This height difference enables the connecting shaft to maintain its height and unlock, making it easier to change the state of the connecting shaft and reducing the difficulty of the entire disassembly process. Furthermore, after the connecting shaft is inserted between the guide and the fixing ring, the structural strength of the single-tower connection is improved. Attached Figure Description

[0033] Figure 1 A schematic diagram of one embodiment of a single power pole;

[0034] Figure 2 This is a schematic diagram of the internal structure of the first and second tubes in one embodiment of a single power pole;

[0035] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0036] Figure 4 This is a schematic diagram of the first tube body and the protrusion in the central connection structure of the steel pipe pole;

[0037] Figure 5 for Figure 2 Enlarged structural diagram at point B;

[0038] Figure 6 A schematic diagram of the inter-space locking assembly in the center connection structure of the steel pipe pole;

[0039] Figure 7 for Figure 2 Enlarged schematic diagram of the structure at point C;

[0040] Figure 8 A schematic diagram of the lifting assembly in one embodiment of the steel pipe pole center connection structure;

[0041] Figure 9 A schematic diagram of the lifting assembly from another angle in one embodiment of the steel pipe pole center connection structure;

[0042] In the diagram: 1. First tube body; 2. Second tube body; 3. Fixing ring; 4. Guide component; 5. Inclined guide surface; 6. Vertical groove; 7. Inclined groove; 8. Annular guide surface; 9. Protrusion; 10. Connecting shaft; 11. Connecting plate; 12. No. 1 vertical shaft; 13. No. 1 spring; 14. Pull rod; 15. Hinge rod; 16. Hook part; 17. Lower cone; 18. Upper cone; 19. No. 2 vertical shaft; 20. No. 2 spring; 21. Connecting component; 22. No. 1 limiting ring; 23. Lifting component; 24. Guide sleeve; 25. Slider; 26. Transmission wheel; 27. Transmission belt; 28. Follower plate; 29. ​​Guide plate; 30. Drive part; 31. Belt; 32. Cam; 33. Abutment roller; 34. No. 2 limiting ring. Detailed Implementation

[0043] 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.

[0044] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0045] Please see Figures 1-9 In this embodiment of the invention, a steel pipe pole center connection structure is used to connect a first pipe body 1 and a second pipe body 2, including: a guide 4, a protrusion 9, a connecting shaft 10, and a reinforcing mechanism.

[0046] The guide 4 is disposed inside the second tube 2. The guide 4 cooperates with the end of the first tube 1 and can guide the first tube 1 and the second tube 2 to be coaxial. Specifically, the upper end of the guide 4 forms an annular guide surface 8, which cooperates with the end of the first tube 1.

[0047] The protrusions 9 are provided in multiple sets and are circumferentially equidistantly installed on the inner wall of the first pipe body 1. The protrusions 9 cooperate with the guide groove formed on the guide member 4 to align the bolt holes on the two flanges connecting the first pipe body 1 and the second pipe body 2. The guide groove includes a vertical groove 6 and an inclined groove 7 formed on the guide member 4. The vertical groove 6 and the inclined groove 7 are smoothly connected, and the end of the vertical groove 6 away from the inclined groove 7 is provided with two inclined guide surfaces 5.

[0048] When assembling the single-pole tower, the second pipe body 2 is first installed on the pre-made concrete platform. Then, the first pipe body 1 is lifted by a crane. When the first pipe body 1 rises to the point where its lower end is higher than the second pipe body 2, the lower end of the first pipe body 1 needs to be aligned with the upper end of the second pipe body 2. The specific alignment process is as follows: the first pipe body 1 is lifted to the upper part of the second pipe body 2. At this time, the central axes of the first pipe body 1 and the second pipe body 2 are close to each other but not collinear. Then, the first pipe body 1 is lowered so that its lower end abuts against the annular guide surface 8. Then, as the lowering continues... The protrusion 9 will abut against the annular guide surface 8, making the central axes of the first tube 1 and the second tube 2 collinear. Then, as the first tube 1 continues to be lowered, the protrusion 9 will move towards the vertical groove 6 under the action of the inclined guide surface 5, and move from the vertical groove 6 to the inclined groove 7. When the protrusion 9 moves to the end of the inclined groove 7, the lower end of the first tube 1 and the upper end of the second tube 2 will be in abutment state. At the same time, the bolt holes on the two flanges connecting the first tube 1 and the second tube 2 will also automatically align, thus facilitating the installation of bolts and nuts between the two flanges by the workers.

[0049] The above-mentioned design makes it easier to connect the first pipe body 1 and the second pipe body 2. After the first pipe body 1 and the second pipe body 2 are connected, the bolt holes on the two flanges connecting the first pipe body 1 and the second pipe body 2 will automatically align, making it easier for workers to install bolts. At the same time, when the protrusion 9 moves to the end of the inclined groove 7, if the first pipe body 1 tilts, it needs to overcome its own weight. That is, the weight of the first pipe body 1 can have a certain inhibitory effect on the tilt of the first pipe body 1, thereby improving the safety during the connection process.

[0050] Please see Figure 5 , Figure 6 The connecting shaft 10 is coaxially arranged with the second tube body 2. The interior of the connecting shaft 10 is a hollow structure, and the connecting shaft 10 is slidably engaged with the fixing ring 3 arranged inside the first tube body 1.

[0051] The reinforcement mechanism is disposed between the first tube 1 and the second tube 2. The reinforcement mechanism includes a lifting component and an interval locking component. The lifting component can drive the connecting shaft 10 to move toward the interval locking component and has two movement strokes, namely stroke A and stroke B. When the connecting shaft 10 is in stroke A, the connecting shaft 10 reaches the locked state. When the connecting shaft 10 is in stroke B, it triggers unlocking, disengages from the interval locking component, and resets.

[0052] The lifting assembly includes a follower plate 28 disposed inside the second tube 2, on which two drive wheels 26 are rotatably mounted, and a drive belt 27 is sleeved between the two drive wheels 26;

[0053] One of the drive wheels 26 has a shaft that passes through the second tube 2 and is provided with a drive unit 30, and the shaft of the drive wheel 26 is connected to a lifting structure between the follower plate 28 and the second tube 2.

[0054] The lifting assembly also includes a lifting member 23 disposed on the follower plate 28. The lifting member 23 is connected to the transmission belt 27 through a fitting structure. The fitting structure includes a slider 25 rotatably mounted on the transmission belt 27. The slider 25 is slidably connected to a groove disposed on the lifting member 23 and perpendicular to the length direction of the lifting member 23.

[0055] The follower plate 28 is also provided with a guide sleeve 24, which is slidably connected to the lifting member 23;

[0056] The lifting structure includes a cam 32 rotatably mounted on the follower plate 28. The shaft of the cam 32 is connected to the shaft of the transmission wheel 26 via a belt 31, and the cam 32 is in rolling engagement with an abutment roller 33 rotatably mounted on the second tube 2.

[0057] Two guide plates 29 are also fixedly installed inside the second tube body 2, and the two guide plates 29 are slidably connected to the follower plate 28.

[0058] After the first tube 1 and the second tube 2 are connected, in the initial state, the second limiting ring 34 is in contact with the upper end of the connecting shaft 10, and the hinge rod 15 and the hook part 16 are inside the guide member 4. Under the action of the first spring 13, the first vertical shaft 12 and the pull rod 14 pull multiple hinge rods 15 to maintain a tightened state. At this time, the projection of the hook part 16 on the hinge rod 15 onto the lower cone 17 is located on the conical surface of the lower cone 17. As the connecting shaft 10 moves from the guide member 4 toward the lower cone 17, the hinge rod 15... 5. The hook part 16 will first pass through the fixing ring 3, and then the hook part 16 will abut against the conical surface on the lower cone 17. Under the action of the conical surface, the multiple hook parts 16 will move away from each other. After the hook part 16 moves to the upper part of the lower cone 17, the multiple hook parts 16 will tighten and clamp and hook the lower cone 17. At this time, the connecting shaft 10 will be released and will remain stationary, so that the connecting shaft 10 will remain in the state of passing through the guide 4 and the fixing ring 3, and the structural strength of the connection between the first tube 1 and the second tube 2 will be higher.

[0059] When the connecting shaft 10 needs to retract into the guide member 4, it continues to push upward. The hook portion 16 has an inclined surface on its upper part. When the connecting shaft 10 moves to the point where the hook portion 16 is aligned with the lower part of the upper cone 18, the projection of the edge of the upper cone 18 lies on the inclined surface of the hook portion 16. As the connecting shaft 10 continues to move upward, the inclined surface on the hook portion 16, under the action of the edge of the upper cone 18, further drives the multiple hook portions 16 to move away from each other. (Under the action of the second spring 20, initially, the upper cone 18 and the first limit...) When the ring 22 is in the contact state, the hook part 16 clamps the upper cone 18. Then, when the connecting shaft 10 is released, the connecting shaft 10 descends under the action of gravity, causing the upper cone 18 to move downward to compress the second spring 20. After the upper cone 18 and the lower cone 17 come into contact, the hook part 16 will move along the conical surface of the upper cone 18 and move onto the lower cone 17, completing the separation of the upper cone 18 and the lower cone 17. Then the connecting shaft 10 will return to the initial state, making it more convenient to disassemble the first tube 1 and the second tube 2.

[0060] With the above settings, after the first tube 1 and the second tube 2 are assembled, the connecting shaft 10 can be inserted between the guide 4 and the fixing ring 3 to improve the structural strength of the single tower connection. At the same time, when the first tube 1 and the second tube 2 are disassembled, the connecting shaft 10 can be reset, making the disassembly process more convenient.

[0061] It should be noted that the upper cone 18 is larger than the lower cone 17.

[0062] Please see Figures 7-9 The interval locking assembly includes a plurality of hinge rods 15 rotatably mounted on the upper end of the connecting shaft 10. The end of each hinge rod 15 away from the connecting shaft 10 has a hook portion 16, and a pull rod 14 is rotatably mounted on the hinge rod 15. The end of the pull rod 14 away from the hinge rod 15 is connected to an elastic structure provided on the connecting shaft 10. The elastic structure includes a first vertical shaft 12 movably disposed through the connecting shaft 10. One end of the first vertical shaft 12 is provided with a connecting plate 11, and the other end is rotatably connected to the pull rod 14.

[0063] A first spring 13 is also sleeved on the first vertical shaft 12. One end of the first spring 13 is connected to the connecting plate 11, and the other end is connected to the inner wall of the connecting shaft 10. A second limiting ring 34 is also provided on the first vertical shaft 12.

[0064] The interval locking assembly further includes an expansion locking structure disposed on the first tube body 1 and adapted to the hook part 16. The expansion locking structure includes a connector 21 fixedly installed on the first tube body 1. A second vertical shaft 19 is installed on the connector 21. A lower cone 17 is disposed at one end of the second vertical shaft 19 away from the connector 21. An upper cone 18 is slidably installed on the second vertical shaft 19. The upper cone 18 is adapted to a first limiting ring 22 disposed on the second vertical shaft 19.

[0065] A second spring 20 is also fitted on the second vertical shaft 19, and the two ends of the second spring 20 are respectively connected to the upper cone 18 and the lower cone 17.

[0066] The lifting and lowering of the connecting shaft 10 is achieved as follows: an external drive unit 30 is installed to drive the drive unit 30 to rotate, causing one of the transmission wheels 26 to rotate and the transmission belt 27 sleeved between the two transmission wheels 26 to move. Since the slider 25 slides inside the lifting member 23, the lifting member 23 can be lifted and lowered during the movement of the transmission belt 27. During the rotation of the transmission wheels 26 to drive the lifting member 23 to move through the transmission belt 27 and the slider 25, the cam 32 will also rotate along with the transmission wheels 26. Specifically, during two consecutive movements of the slider 25 to the highest point of its stroke, the long axis of the cam 32 just comes into contact with the abutting roller 33, causing the entire follower plate 28 to move upward. That is, during two consecutive movements of the slider 25 to the highest point of its stroke, there is a difference in the height of the lifting member 23. The specific difference is the length of the long axis of the cam 32 minus the length of the short axis of the cam 32. The height difference of the highest point of the lifting member 23 can cause a difference in the height of the highest point of the connecting shaft 10, thus determining whether the connecting shaft 10 passes through the fixed ring 3.

[0067] Furthermore, the aforementioned transmission wheel 26 and transmission belt 27 are respectively sprocket and chain structures, and when the connecting shaft 10 is at its lowest point of travel, it will be in contact with the lifting member 23.

[0068] With the above settings, there can be a certain height difference during two adjacent lifting and lowering processes of the connecting shaft 10. The height difference is used to maintain and unlock the connecting shaft 10, making it easier to change the state of the connecting shaft 10 and thus reducing the difficulty of the entire disassembly process.

[0069] As an embodiment of the present invention, a single power pole tower is also proposed, including the aforementioned steel pipe pole center connection structure.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A steel pipe pole center connection structure for connecting a first pipe body (1) and a second pipe body (2), characterized in that, include: A guide (4) is disposed inside the second tube (2). The guide (4) cooperates with the end of the first tube (1) and can guide the first tube (1) and the second tube (2) to be coaxial. The protrusions (9) are provided in multiple sets and are circumferentially equidistantly installed on the inner wall of the first tube (1). The protrusions (9) cooperate with the guide groove formed on the guide member (4) so ​​that the bolt holes on the two flanges connecting the first tube (1) and the second tube (2) are aligned. A connecting shaft (10) is coaxially arranged with the second tube body (2), and the connecting shaft (10) is slidably engaged with a fixing ring (3) arranged inside the first tube body (1); A reinforcement mechanism is provided between the first tube body (1) and the second tube body (2). The reinforcement mechanism includes a lifting component and an interval locking component. The lifting component can drive the connecting shaft (10) to move toward the interval locking component and has two movement strokes, namely stroke A and stroke B. When the connecting shaft (10) is in stroke A, the connecting shaft (10) reaches the locked state. When the connecting shaft (10) is in stroke B, it triggers unlocking, disengages from the interval locking component, and resets.

2. The steel pipe pole center connection structure according to claim 1, characterized in that, The upper end of the guide member (4) has an annular guide surface (8); The guide groove includes a vertical groove (6) and an inclined groove (7) formed on the guide member (4). The vertical groove (6) and the inclined groove (7) are smoothly connected, and two inclined guide surfaces (5) are provided at the end of the vertical groove (6) away from the inclined groove (7).

3. The steel pipe pole center connection structure according to claim 1, characterized in that, The lifting assembly includes a follower plate (28) disposed inside the second tube (2), on which two drive wheels (26) are rotatably mounted, and a drive belt (27) is sleeved between the two drive wheels (26); One of the drive wheels (26) has a shaft that passes through the second tube (2) and is provided with a drive unit (30), and the shaft of the drive wheel (26) is connected to a lifting structure between the follower plate (28) and the second tube (2); The lifting assembly also includes a lifting member (23) disposed on the follower plate (28), and the lifting member (23) is connected to the transmission belt (27) through a fitting structure.

4. The steel pipe pole center connection structure according to claim 3, characterized in that, The fitting structure includes a slider (25) rotatably mounted on the transmission belt (27), and the slider (25) is slidably connected to a groove disposed on the lifting member (23) and perpendicular to the length direction of the lifting member (23); The follower plate (28) is also provided with a guide sleeve (24), which is slidably connected to the lifting member (23).

5. The steel pipe pole center connection structure according to claim 3, characterized in that, The lifting structure includes a cam (32) rotatably mounted on the follower plate (28), the shaft of the cam (32) is connected to the shaft of the transmission wheel (26) via a belt (31), and the cam (32) is in rolling engagement with an abutment roller (33) rotatably mounted on the second tube (2); Two guide plates (29) are also fixedly installed inside the second tube (2), and the two guide plates (29) are slidably connected to the follower plate (28).

6. The steel pipe pole center connection structure according to claim 1, characterized in that, The connecting shaft (10) has a hollow structure inside; The interval locking assembly includes a plurality of hinge rods (15) rotatably mounted on the upper end of the connecting shaft (10). A hook portion (16) is formed at the end of the hinge rod (15) away from the connecting shaft (10), and a pull rod (14) is rotatably mounted on the hinge rod (15). The end of the pull rod (14) away from the hinge rod (15) is connected to an elastic structure provided on the connecting shaft (10). The interval locking assembly also includes an expansion locking structure disposed on the first tube body (1) and adapted to the hook part (16).

7. The steel pipe pole center connection structure according to claim 6, characterized in that, The elastic structure includes a first vertical shaft (12) that is movably disposed through the connecting shaft (10). One end of the first vertical shaft (12) is provided with a connecting plate (11), and the other end is rotatably connected to the pull rod (14). A first spring (13) is also fitted on the first vertical shaft (12). One end of the first spring (13) is connected to the connecting plate (11), and the other end is connected to the inner wall of the connecting shaft (10). The first vertical shaft (12) is also provided with a second limiting ring (34).

8. The steel pipe pole center connection structure according to claim 6, characterized in that, The expansion and locking structure includes a connector (21) fixedly installed on the first tube body (1), a second vertical shaft (19) is installed on the connector (21), a lower cone (17) is provided at one end of the second vertical shaft (19) away from the connector (21), and an upper cone (18) is slidably installed on the second vertical shaft (19), the upper cone (18) is adapted to a first limiting ring (22) provided on the second vertical shaft (19); A second spring (20) is also fitted on the second vertical shaft (19), and the two ends of the second spring (20) are connected to the upper cone (18) and the lower cone (17) respectively.

9. A single-pole power transmission tower, characterized in that, It includes the steel pipe pole center connection structure as described in claim 1.

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