Variable cross-section truss structure of large-span heavy-load steel pipe tower

Abstract

The application discloses a variable cross-section truss structure of a large-span heavy-load steel pipe tower and relates to the technical field of steel pipe towers. The variable cross-section truss structure comprises a steel pipe tower body, a fixing frame installed on the steel pipe tower body, a fixing plate one installed on the steel pipe tower body, a wind-resistant damping mechanism installed on the steel pipe tower body, and the wind-resistant damping mechanism is used for improving the wind-resistant effect of the steel pipe tower. When it is windy, the wind-resistant damping mechanism can make the whole tower body generate a shrinking force inward, effectively offset the outward expansion and overturning load of the tower body caused by the wind, constrain the expansion deformation of the truss frame, greatly reduce the lateral sway and wind-induced vibration amplitude of the tower body, and optimize the overall stress state by the shrinking force, thereby significantly relieving the stress concentration problem caused by the sudden change of the rigidity of the variable cross-section truss node. When it is necessary to adjust the elastic anti-vibration pressure, the pre-tightening force of the straight rod can be changed, the damping threshold can be adjusted, and the variable cross-section truss of the large-span heavy-load steel pipe tower can be adapted to different tower sections.

Description

Technical Field

[0001] This invention relates to the field of steel pipe tower technology, specifically to a variable cross-section truss structure for large-span heavy-duty steel pipe towers. Background Technology

[0002] Large-span heavy-duty steel pipe towers generally adopt variable cross-section truss structures, with the tower body cross-section gradually narrowing from bottom to top. This can match the internal force distribution law of the tower body decreasing along the height, effectively optimize the utilization rate of structural materials, reduce the self-weight of the tower body and the foundation load, and have advantages such as strong load-bearing capacity, good overall stiffness, and suitability for large-span crossing scenarios. They are widely used in the field of heavy-duty high-rise engineering projects such as high-voltage power transmission and long-span lines.

[0003] Traditional large-span, heavy-duty steel pipe towers with variable cross-section truss structures exhibit significant performance defects under strong wind conditions. The tower body is susceptible to outward overturning loads under strong winds, and the truss frame is prone to expansion deformation, resulting in large lateral sway and high wind-induced vibration amplitude. The variable cross-section locations exhibit abrupt stiffness changes, leading to significant stress concentration at nodes under long-term alternating wind loads. Members and nodes are prone to alternating fatigue damage, resulting in poor overall wind resistance. Furthermore, traditional tower vibration reduction structures often use fixed parameter settings. It is difficult to adjust the elastic damping preload and damping threshold according to the stiffness and vibration characteristics of different tower sections and different variable cross-section nodes. It is difficult to adapt to different wind load conditions. The damping energy consumption is insufficient in strong winds. Under medium and small wind conditions, the elastic components are prone to frequent reciprocating deformation and aging failure. It is difficult to balance the damping effect of each variable cross-section node. It is easy to have excessive preload of the damping rod, resulting in stiffness failure or insufficient preload and insufficient support. It is difficult to balance the heavy load bearing performance and long-term damping effect, which seriously affects the service reliability and service life of steel pipe towers in complex wind environments. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a variable cross-section truss structure for large-span heavy-duty steel pipe towers, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a variable cross-section truss structure for a large-span heavy-load steel pipe tower, comprising a steel pipe tower body, a fixing frame installed on the steel pipe tower body, and a fixing plate installed on the steel pipe tower body; the variable cross-section truss structure for the large-span heavy-load steel pipe tower further includes:

[0006] The wind-resistant and vibration-damping mechanism is installed on the steel pipe tower body. It is used to improve the wind resistance of the steel pipe tower. In windy weather, it causes the tower body to generate an inward contraction force, which can effectively counteract the outward expansion and overturning load of the wind on the tower body, restrain the expansion deformation of the truss frame, and significantly reduce the lateral sway and wind-induced vibration amplitude of the tower body. At the same time, the contraction force can optimize the overall stress state, significantly alleviate the stress concentration problem caused by the sudden change in stiffness of the variable cross-section truss nodes, reduce the alternating fatigue damage of members and nodes, improve the overall stability and wind resistance of the structure, adapt to the field service environment, have high reliability and simple maintenance. With the limit structure, the amount of contraction deformation can be strictly controlled to avoid buckling of members under compression, and ensure the normal heavy load bearing capacity of the tower. It effectively solves the defects of traditional variable cross-section trusses, such as weak wind resistance and easy damage to nodes.

[0007] The wind-resistant and vibration-damping mechanism includes a cross plate mounted on the fixed frame, a chamfered plate mounted on the fixed plate, a telescopic rotating plate mounted on the chamfered plate, a hexagonal plate mounted on the chamfered plate, and a straight rod mounted on the hexagonal plate, with a counterweight mounted on the straight rod.

[0008] A pressure adjustment mechanism, installed on the fixed plate, is used to adjust the vibration reduction effect according to wind intensity. When it is necessary to adjust the elastic anti-vibration pressure, it can change the preload of the straight rod and adjust the vibration reduction threshold. This adapts to the stiffness and vibration characteristics of different tower sections and nodes of large-span heavy-duty steel pipe towers with variable cross-sections. Through pressure adjustment, the vibration reduction performance can be calibrated for different wind load conditions. This not only fully dissipates vibration energy and suppresses wind-induced vibration under strong wind conditions, but also avoids frequent vibration of the elastic damping rod under light to medium wind conditions. The repeated deformation reduces fatigue and aging of elastic components. At the same time, the pressure of each damping rod can be adjusted according to the differences in load and vibration amplitude at different heights of the tower. This can balance the damping effect of each variable cross-section node, alleviate stress concentration at the variable cross-section location, and adjust the preload according to the actual heavy load bearing state of the tower body. This prevents excessive preload from causing damping rod stiffness failure or insufficient preload from reducing support capacity. It takes into account both the load-bearing capacity of the truss structure and the damping effect, extends the service life of the elastic damping rod, and improves the reliability of the steel pipe tower in complex wind environments.

[0009] Preferably, the pressure regulating mechanism includes a cross plate two mounted on the fixed plate one, a threaded rod mounted on the cross plate two, and a handle mounted on the threaded rod;

[0010] The threaded rod exerts pressure on the hexagonal plate during operation. The threaded rod and the hexagonal plate are in contact, further enhancing the vibration resistance of the telescopic rotating tower during windy conditions. Simultaneously, in windy weather, the forward movement of the toothed plate causes the counterweight plate to move forward, allowing it to move in the opposite direction of the wind. This generates a reverse inertial moment and an offset gravity moment, counteracting the overturning moment exerted on the tower by the wind, reducing lateral displacement, suppressing tower sway amplitude, and weakening wind-induced vibrations of the variable cross-section truss. The reverse movement of the counterweight plate balances the lateral load generated by wind pressure on the tower, reducing the alternating load on the variable cross-section transition nodes and truss members, alleviating stress concentration caused by sudden changes in stiffness at the variable cross-section position, reducing member fatigue damage, and effectively improving the structural safety reserve of the steel pipe tower in strong wind environments. The counterweight plate passively triggers displacement following the wind load, requiring no additional drive mechanism, making it suitable for outdoor tower conditions.

[0011] Preferably, a spring is provided between the cross plate and the hexagonal plate, and the counterweight is used to improve the stability of the steel pipe tower body by gravity.

[0012] Preferably, the wind-resistant vibration reduction mechanism further includes a leveling mechanism installed on the fixed plate one, the leveling mechanism including a hinge block installed on the cross plate two, a rotating block rotatably installed on the hinge block, a hinge rod installed on the telescopic rotating plate, and an elastic telescopic rod installed on the rotating block;

[0013] The hinged rod is rotatably connected to the elastic telescopic rod. During the installation of the steel pipe tower body, the inner groove block moves and is fixed with the nut, which is then locked inside the inner groove block. This limits the nut's position, providing a stable preload for assembly, resisting the reciprocating alternating vibrations caused by strong winds, preventing bolt loosening and component displacement, ensuring the stability of each component's position, and guaranteeing the normal transmission of truss loads. This further enhances the vibration resistance and anti-loosening effect, making it suitable for complex field conditions. At the same time, the nut connection facilitates on-site assembly, and parts can be disassembled and replaced during later maintenance without the need for welding or cutting the steel pipe tower body, reducing the difficulty of operation and maintenance.

[0014] Preferably, the leveling mechanism further includes a slide rail installed on the steel pipe tower body, a gear installed on the slide rail, a toothed plate one installed on the slide rail, a counterweight plate installed on the toothed plate one, a toothed plate two installed on the slide rail, and a wind deflector plate installed on the toothed plate two.

[0015] The counterweight plate is used to adjust the center of gravity of the steel pipe tower according to the wind direction, and the wind baffle is used to withstand the wind force.

[0016] Preferably, the first toothed plate meshes with the gear, and the gear meshes with the second toothed plate.

[0017] Preferably, the wind-resistant vibration reduction mechanism further includes an anti-fall-off mechanism installed on the fixed plate, the anti-fall-off mechanism including an elastic rod installed on the fixed plate, a movable plate installed on the elastic rod, and an inner groove block installed on the movable plate;

[0018] The inner groove block is used to prevent the nut from loosening and improve the stability of the steel pipe tower connection. Under the premise of meeting the load-bearing requirements of large span and heavy load, it improves the reliability of node connection and extends the overall service life of the truss. When fixing, the locking block will lock behind the limiting block and limit the position of the limiting block. At this time, the inner groove block will no longer limit the nut, thus making it convenient for workers to disassemble the nut. When the tower is in normal service, the inner groove block is used to block and limit the nut, restricting the nut from rotating and resisting the reciprocating alternating vibration caused by strong winds.

[0019] Preferably, the anti-fall-off mechanism further includes a limiting block installed on the elastic rod, a second fixed plate installed on the first fixed plate, a sliding rod installed on the second fixed plate, and a locking block installed on the sliding rod, wherein a spring is provided between the first fixed plate and the moving plate.

[0020] Preferably, the locking block is used to limit the positioning block, and a spring is provided between the locking block and the second fixing plate, with the positioning block and the locking block in contact with each other.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. In this invention, during windy weather, the tower body generates an inward contraction force, which effectively counteracts the outward expansion and overturning loads of the wind on the tower body, constrains the expansion deformation of the truss frame, and significantly reduces the amplitude of lateral swaying and wind-induced vibration of the tower body. At the same time, this contraction force optimizes the overall stress state, significantly alleviates the stress concentration problem caused by abrupt changes in the stiffness of variable cross-section truss nodes, reduces alternating fatigue damage to members and nodes, improves the overall stability and wind resistance of the structure, is suitable for field service environments, has high reliability, and is easy to maintain. With the addition of a limiting structure, the amount of contraction deformation can be strictly controlled to prevent buckling of members under compression, ensuring the normal heavy load bearing capacity of the tower. It effectively solves the defects of traditional variable cross-section trusses, such as weak wind resistance and easy damage to nodes. When it is necessary to adjust the elastic anti-vibration pressure, the preload of the straight members can be changed to adjust the vibration reduction threshold, making it suitable for large-span heavy loads. By adjusting the pressure, the stiffness and vibration characteristics of different tower sections and nodes of the variable cross-section truss of the steel pipe tower can be adjusted to achieve vibration reduction performance for different wind load conditions. This can not only fully dissipate vibration energy and suppress wind-induced vibration under strong wind conditions, but also avoid frequent deformation and reciprocation of elastic damping rods under medium and low wind forces, reducing fatigue and aging of elastic components. At the same time, according to the differences in load and vibration amplitude at different height positions of the tower, the pressure of each damping rod can be adjusted to balance the vibration reduction effect of each variable cross-section node, alleviate stress concentration at the variable cross-section position, and adjust the preload according to the actual heavy load bearing state of the tower body to prevent excessive preload from causing damping rod stiffness failure, or insufficient preload from causing a decrease in support capacity. This balances the load-bearing capacity of the truss structure and the vibration reduction effect, extends the service life of the elastic damping rod, and improves the operational reliability of the steel pipe tower in complex wind environments.

[0023] 2. In this invention, the vibration resistance of the telescopic rotating plate tower body can be further improved during strong winds. Simultaneously, in strong winds, the forward movement of the toothed plate will drive the counterweight plate forward, allowing it to move in the opposite direction of the wind. This generates a reverse inertial moment and an offset gravity moment, counteracting the overturning moment exerted on the tower body by the strong wind, reducing the lateral offset of the tower body, suppressing the swaying amplitude, and weakening the wind-induced vibration of the variable cross-section truss. The reverse movement of the counterweight plate can balance the lateral load generated by wind pressure on the tower body, reduce the alternating load on the transition nodes and truss members of the variable cross-section, alleviate the stress concentration caused by the sudden change in stiffness at the variable cross-section position, reduce member fatigue damage, and effectively improve the structural safety reserve of the steel pipe tower in strong wind environments. The counterweight plate passively triggers displacement following the wind load, requiring no additional drive mechanism, making it suitable for outdoor tower conditions.

[0024] 3. In this invention, during the installation of the steel pipe tower body, the inner groove block moves and is fixed with the nut, causing the nut to be locked inside the inner groove block. This limits the nut's position, providing a stable pre-tightening force to resist reciprocating alternating vibrations caused by strong winds, preventing bolt loosening and component displacement, ensuring the stability of each component's position, guaranteeing the normal transmission of truss loads, further improving vibration resistance and anti-loosening effects, and adapting to complex field conditions. Simultaneously, the nut connection facilitates on-site assembly, and components can be disassembled and replaced during later maintenance without welding or cutting the steel pipe tower body, reducing maintenance difficulty. While meeting the requirements of large-span heavy load bearing, it improves the reliability of node connections and extends the overall truss length. During the service life of the tower, when fixing the nut, the locking block will lock behind the limiting block and limit the position of the limiting block. At this time, the inner groove block will no longer limit the nut, making it easier for workers to disassemble the nut. When the tower is in normal service, the inner groove block is used to block and limit the nut, restricting the nut from rotating and resisting the reciprocating alternating vibration caused by strong winds, effectively preventing the nut from loosening and ensuring the reliability of the assembly of each connecting component. When maintenance, adjustment or replacement of parts is required, the moving plate is operated to offset the position of the inner groove block from the nut, no longer obstructing or interfering with the nut, leaving operating space for disassembly and assembly tools. Workers can directly use tools to disassemble the nut without cutting or grinding the tower components. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram showing the positional structure of the fixing plate 1 and the cross plate 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the position structure of the cross plate and the threaded rod of the present invention;

[0028] Figure 4 This is a schematic diagram of the slide rail position structure of the present invention;

[0029] Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the middle;

[0030] Figure 6 For the present invention Figure 4 Enlarged view of the structure at point B in the middle;

[0031] Figure 7 This is a schematic diagram of the positional structure of the movable plate and inner groove block of the present invention.

[0032] The meanings of the labels in the diagram are as follows:

[0033] 1. Steel pipe tower body; 2. Fixing frame; 3. Fixing plate one; 4. Cross plate one; 5. Straight rod; 6. Chamfered plate; 7. Telescopic rotating plate; 8. Hexagonal plate; 9. Counterweight block; 10. Cross plate two; 11. Threaded rod; 12. Turning handle; 13. Leveling mechanism; 131. Hinge block; 132. Hinge rod; 133. Rotating block; 134. Elastic telescopic rod; 135. Slide rail; 136. Gear; 137. Tooth plate one; 138. Counterweight plate; 139. Tooth plate two; 1310. Wind baffle; 14. Anti-falling mechanism; 141. Elastic rod; 142. Moving plate; 143. Inner groove block; 144. Limiting block; 145. Fixing plate two; 146. Sliding rod; 147. Locking block. Detailed Implementation

[0034] 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.

[0035] Example 1:

[0036] Please see Figures 1-7 One embodiment of the present invention is: a variable cross-section truss structure for a large-span heavy-load steel pipe tower, comprising a steel pipe tower body 1, a fixing frame 2 installed on the steel pipe tower body 1, and a fixing plate 3 installed on the steel pipe tower body 1. The variable cross-section truss structure for the large-span heavy-load steel pipe tower further includes:

[0037] The wind-resistant and vibration-damping mechanism is installed on the steel pipe tower body 1. The wind-resistant and vibration-damping mechanism is used to improve the wind resistance of the steel pipe tower.

[0038] The wind-resistant and vibration-damping mechanism includes a cross plate 4 mounted on the fixed frame 2, a chamfered plate 6 mounted on the fixed plate 3, a telescopic rotating plate 7 mounted on the chamfered plate 6, a hexagonal plate 8 mounted on the chamfered plate 6, and a straight rod 5 mounted on the hexagonal plate 8. The movement of the straight rod 5 will release and retract the springs set on its surface. A counterweight 9 is mounted on the straight rod 5. The counterweight 9 will move downward by gravity and drive the straight rod 5 to move downward.

[0039] The pressure regulating mechanism is installed on the fixed plate 3. The pressure regulating mechanism is used to adjust the vibration reduction effect according to the wind intensity.

[0040] The pressure regulating mechanism includes a cross plate 10 mounted on a fixed plate 3, a threaded rod 11 mounted on the cross plate 10, and a handle 12 mounted on the threaded rod 11;

[0041] During operation, the threaded rod 11 is used to generate extrusion force on the hexagonal plate 8. When the hexagonal plate 8 moves downward, it will drive the telescopic rotating plate 7 to rotate downward, and the threaded rod 11 and the hexagonal plate 8 will come into contact with each other.

[0042] A spring is installed between the cross plate 4 and the hexagonal plate 8. The counterweight 9 is used to improve the stability of the steel pipe tower body 1 by gravity. When the telescopic rotating plate 7 rotates downward, it will tighten the chamfered plate 6.

[0043] In this embodiment, during operation: In windy weather, strong winds blow towards the steel pipe tower, easily causing it to sway. Under strong winds, the variable cross-section truss of the large-span heavy-load steel pipe tower will experience wind-induced vibration. The connection points of the tower body will experience relative reciprocating micro-displacement and vibration deformation. This vibration will be transmitted to the straight rod 5. When the steel pipe tower body 1 vibrates, the vibration will cause the straight rod 5 to move up and down. The movement of the straight rod 5 will cause the springs on its surface to expand and contract. At the same time, as the straight rod 5 moves due to vibration, the counterweight 9 will move downwards under gravity, causing the straight rod 5 to move downwards. Subsequently, the downward movement of the straight rod 5 will cause the hexagonal plate 8 to move downwards. The downward movement of the hexagonal plate 8 will cause the telescopic rotating plate 7 to rotate downwards. When the hexagonal plate 8 moves upwards, the telescopic rotating plate 7... The tower will contract. When the telescopic rotating plate 7 rotates downwards, it will tighten the chamfered plate 6 and then transfer the tension to the fixed plate 3, thereby causing the entire tower to generate an inward contraction force. This effectively counteracts the outward expansion and overturning loads of strong winds on the tower, restrains the expansion deformation of the truss frame, and significantly reduces the amplitude of lateral swaying and wind-induced vibration of the tower. At the same time, this contraction force can optimize the overall stress state, significantly alleviate the stress concentration problem caused by the sudden change in stiffness of variable cross-section truss nodes, reduce alternating fatigue damage of members and nodes, improve the overall stability and wind resistance of the structure, adapt to field service environments, have high reliability, and are easy to maintain. With the limit structure, the amount of contraction deformation can be strictly controlled to avoid buckling of members under compression and ensure the normal operation of the tower. The load-bearing capacity effectively solves the defects of traditional variable cross-section trusses, such as weak wind resistance and easy damage to nodes. When it is necessary to adjust the elastic vibration-resistant pressure, the operator can rotate the handle 12 to drive the threaded rod 11 to rotate. The rotation of the threaded rod 11 will move up and down through the threaded groove on its surface. When the threaded rod 11 moves downward, it will contact the hexagonal plate 8 and exert downward pressure on the hexagonal plate 8, thereby limiting the movement distance of the hexagonal plate 8. It can change the preload of the straight rod 5, adjust the vibration reduction trigger threshold, and adapt to the stiffness and vibration characteristics of different tower sections and different variable cross-section nodes of large-span heavy-duty steel pipe tower variable cross-section trusses. Through pressure adjustment, it can be applied to different wind load conditions. The current vibration reduction performance adjustment can not only fully dissipate vibration energy and suppress wind-induced vibration under strong wind conditions, but also avoid frequent deformation and reciprocation of elastic vibration damping rods under medium and low wind forces, reducing fatigue and aging of elastic components. At the same time, according to the differences in load and vibration amplitude at different height positions of the tower, the pressure of each vibration damping rod can be adjusted to balance the vibration reduction effect of each variable cross-section node, alleviate stress concentration at variable cross-section positions, and adjust the preload according to the actual heavy load bearing state of the tower body to prevent excessive preload from causing vibration damping rod stiffness failure, or insufficient preload from causing a decrease in support capacity. It takes into account the load-bearing capacity of the truss structure and the vibration reduction and suppression effect, extends the service life of elastic vibration damping rods, and improves the operational reliability of steel pipe towers in complex wind environments.

[0044] Example 2:

[0045] Please see Figures 1-7Based on the above embodiments, in another embodiment of the present invention, the wind-resistant vibration reduction mechanism further includes a leveling mechanism 13 installed on the fixed plate 3. The leveling mechanism 13 includes a hinge block 131 installed on the cross plate 10, a rotating block 133 rotatably installed on the hinge block 131, a hinge rod 132 installed on the telescopic rotating plate 7, and an elastic telescopic rod 134 installed on the rotating block 133. The movement of the hinge rod 132 will drive the elastic telescopic rod 134 to move.

[0046] The hinge rod 132 is rotatably connected to the elastic telescopic rod 134.

[0047] The leveling mechanism 13 also includes a slide rail 135 installed on the steel pipe tower body 1, a gear 136 installed on the slide rail 135, a toothed plate 137 installed on the slide rail 135, a counterweight plate 138 installed on the toothed plate 137, a toothed plate 139 installed on the slide rail 135, and a wind deflector 1310 installed on the toothed plate 139. The movement of the wind deflector 1310 will drive the toothed plate 139 to move synchronously.

[0048] The counterweight plate 138 is used to adjust the center of gravity of the steel pipe tower according to the wind direction, and the wind baffle plate 1310 is used to withstand the wind force.

[0049] Gear plate 137 meshes with gear 136, and gear 136 meshes with gear plate 139. When gear plate 139 moves backward, it will drive gear 136 to rotate counterclockwise through its teeth.

[0050] In this embodiment, during vibration resistance in windy weather, the movement of the telescopic rotating plate 7 will cause the hinge rod 132 to move, which in turn will cause the elastic telescopic rod 134 to move. At this time, the elastic telescopic rod 134 can improve the vibration and compression resistance of the telescopic rotating plate 7, further enhancing its vibration resistance. Simultaneously, in windy weather, the wind will blow towards the windbreak plate 1310, forcing it to move backward. The movement of the windbreak plate 1310 will cause the toothed plate 139 to move synchronously. The backward movement of the toothed plate 139 will drive the gear 136 to rotate counterclockwise via its teeth. The rotation of the gear 136 will drive the toothed plate 137 to move forward via its teeth. The forward movement of the toothed plate 137 will drive the counterweight plate 1... The counterweight plate 138 moves forward, allowing it to move in the opposite direction of the wind during strong winds. This generates a reverse inertial moment and an offset gravity moment, counteracting the overturning moment exerted on the tower by the strong wind, reducing the lateral offset of the tower, suppressing the swaying amplitude of the tower, and weakening the wind-induced vibration of the variable cross-section truss. The reverse movement of the counterweight plate 138 can balance the lateral load generated by the wind pressure on the tower, reduce the alternating load on the transition nodes and truss members of the variable cross-section, alleviate the stress concentration caused by the sudden change in stiffness at the variable cross-section position, reduce fatigue damage to the members, and effectively improve the structural safety reserve of the steel pipe tower in strong wind environments. The counterweight plate 138 passively triggers displacement following the wind load without the need for an additional drive mechanism, making it suitable for outdoor tower working conditions.

[0051] Example 3:

[0052] Please see Figures 1-7 Based on the above embodiments, in another embodiment of the present invention, the wind-resistant vibration reduction mechanism further includes an anti-fall-off mechanism 14 installed on the fixed plate 3. The anti-fall-off mechanism 14 includes an elastic rod 141 installed on the fixed plate 3, a movable plate 142 installed on the elastic rod 141, and an inner groove block 143 installed on the movable plate 142. The movement of the elastic rod 141 will drive the movable plate 142 to move synchronously.

[0053] The inner groove block 143 is used to prevent the nut from loosening and improve the stability of the steel pipe tower connection. The movement of the moving plate 142 will drive the inner groove block 143 to move.

[0054] The anti-fall-off mechanism 14 also includes a limiting block 144 installed on the elastic rod 141, a second fixed plate 145 installed on the first fixed plate 3, a sliding rod 146 installed on the second fixed plate 145, and a locking block 147 installed on the sliding rod 146. The elastic rod 141 will move and compress towards the second fixed plate 145 by a spring provided on its surface. A spring is provided between the first fixed plate 3 and the moving plate 142.

[0055] The locking block 147 is used to limit the limiting block 144. During the movement of the limiting block 144, it will contact the locking block 147. A spring is provided between the locking block 147 and the fixing plate 145. The limiting block 144 and the locking block 147 are in contact with each other.

[0056] In this embodiment, during the installation of the steel pipe tower body 1, the elastic rod 141 is compressed and moved towards the fixed plate 145 via a surface spring. The movement of the elastic rod 141 causes the moving plate 142 to move synchronously, which in turn causes the inner groove block 143 to move. The inner groove block 143 then locks the nut in place, thus limiting its position. This provides a stable preload for assembly, resists reciprocating vibrations caused by strong winds, prevents bolt loosening and component displacement, and ensures the proper positioning of all components. Stability ensures normal load transfer of the truss, further enhancing vibration resistance and anti-loosening effects, adapting to complex field conditions. Nut connections facilitate on-site assembly, and components can be disassembled and replaced during later maintenance without welding or cutting the steel pipe tower body 1, reducing maintenance difficulty. While meeting the requirements of large-span heavy load bearing, it improves the reliability of node connections and extends the overall service life of the truss. During fixing, the movement of the elastic rod 141 will drive the limit block 144 to move. During the movement of the limit block 144, it will contact the locking block 147 and generate pressure through the inclined surface on the locking block 147. The squeezing force forces the locking block 147 to move, which in turn moves the sliding rod 146 and compresses the spring on the surface of the sliding rod 146. When disassembly is required, the elastic rod 141 is pulled outward to prevent the limiting block 144 from contacting the locking block 147. At this time, the sliding rod 146 moves towards the inner groove block 143 via the spring on its surface. The inner groove block 143 is no longer in contact with the nut, and the locking block 147 will lock onto the rear side of the limiting block 144, limiting the position of the limiting block 144. 3. The nut will no longer be limited, making it easier for workers to disassemble it. When the tower is in normal service, the inner groove block 143 is used to block and limit the nut, restricting its rotation and resisting the reciprocating vibration caused by strong winds, effectively preventing the nut from loosening and ensuring the reliability of the assembly of each connecting component. When maintenance, adjustment or replacement of parts is required, the moving plate 142 is operated to make the inner groove block 143 and the nut position staggered, no longer obstructing or interfering with the nut, leaving operating space for disassembly and assembly tools. Workers can directly use tools to disassemble the nut without cutting or grinding the tower components.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable cross-section truss structure for a long-span, heavy-load steel pipe tower, comprising a steel pipe tower body (1), a fixing frame (2) mounted on the steel pipe tower body (1), and a fixing plate (3) mounted on the steel pipe tower body (1), characterized in that, The variable cross-section truss structure of the large-span heavy-load steel pipe tower also includes: A wind-resistant vibration reduction mechanism is installed on the steel pipe tower body (1). The wind-resistant vibration reduction mechanism is used to improve the wind resistance of the steel pipe tower. The wind-resistant and vibration-damping mechanism includes a cross plate (4) installed on the fixed frame (2), a chamfer plate (6) installed on the fixed plate (3), a telescopic rotating plate (7) installed on the chamfer plate (6), a hexagonal plate (8) installed on the chamfer plate (6), and a straight rod (5) installed on the hexagonal plate (8), with a counterweight (9) installed on the straight rod (5). A pressure regulating mechanism is installed on the fixed plate (3). The pressure regulating mechanism is used to adjust the vibration reduction effect according to the wind force intensity.

2. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 1, characterized in that: The pressure regulating mechanism includes a cross plate two (10) mounted on the fixed plate one (3), a threaded rod (11) mounted on the cross plate two (10), and a throttle (12) mounted on the threaded rod (11). The threaded rod (11) is used to generate extrusion force on the hexagonal plate (8) during operation, and the threaded rod (11) is in contact with the hexagonal plate (8).

3. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 2, characterized in that: A spring is provided between the cross plate (4) and the hexagonal plate (8), and the counterweight (9) is used to improve the stability of the steel pipe tower body (1) by gravity.

4. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 2, characterized in that: The wind-resistant vibration reduction mechanism also includes a leveling mechanism (13) installed on the fixed plate (3). The leveling mechanism (13) includes a hinge block (131) installed on the cross plate (10), a rotating block (133) rotatably installed on the hinge block (131), a hinge rod (132) installed on the telescopic rotating plate (7), and an elastic telescopic rod (134) installed on the rotating block (133). The hinge rod (132) is rotatably connected to the elastic telescopic rod (134).

5. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 4, characterized in that: The leveling mechanism (13) further includes a slide rail (135) installed on the steel pipe tower body (1), a gear (136) installed on the slide rail (135), a toothed plate (137) installed on the slide rail (135), a counterweight plate (138) installed on the toothed plate (137), a toothed plate (139) installed on the slide rail (135), and a wind deflector (1310) installed on the toothed plate (139). The counterweight plate (138) is used to adjust the center of gravity of the steel pipe tower according to the wind direction, and the wind baffle plate (1310) is used to withstand the wind force.

6. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 5, characterized in that: The first toothed plate (137) meshes with the gear (136), and the gear (136) meshes with the second toothed plate (139).

7. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 6, characterized in that: The wind-resistant vibration reduction mechanism also includes an anti-fall-off mechanism (14) installed on the fixed plate (3). The anti-fall-off mechanism (14) includes an elastic rod (141) installed on the fixed plate (3), a movable plate (142) installed on the elastic rod (141), and an inner groove block (143) installed on the movable plate (142). The inner groove block (143) is used to prevent the nut from loosening and to improve the stability of the steel pipe tower connection.

8. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 7, characterized in that: The anti-fall-off mechanism (14) further includes a limiting block (144) installed on the elastic rod (141), a fixing plate two (145) installed on the fixing plate one (3), a sliding rod (146) installed on the fixing plate two (145), and a locking block (147) installed on the sliding rod (146). A spring is provided between the fixing plate one (3) and the moving plate (142).

9. The variable cross-section truss structure for a large-span heavy-load steel pipe tower according to claim 8, characterized in that: The locking block (147) is used to limit the limiting block (144). A spring is provided between the locking block (147) and the second fixing plate (145). The limiting block (144) and the locking block (147) are in contact with each other.

Images