A reinforced cross arm structure of a power transmission line tower

Abstract

The utility model provides a kind of reinforcing cross arm structure of transmission line tower, belong to transmission tower wind resistance reinforcing technical field, the reinforcing cross arm structure of this transmission line tower includes tower body structure and bottom support seat, tower body structure includes main support structure and lateral reinforcing cross arm, both are fixedly connected by diagonal bracing, and between connection setting shock absorption mechanism;Shock absorption mechanism includes suspension damper;Reinforcing cross arm below is provided with wire slot, and the inboard end of wire slot is connected with tower body structure by elastic connecting piece;Elastic connecting piece is equipped with self-adapting adjusting buffer component;Wire slot outside is equipped with reinforcing device, and reinforcing device includes multiple locking pins and locking block;Reinforcing cross arm and diagonal bracing, shock absorption mechanism junction is provided with sealed anticorrosive cavity, and cavity is filled with anticorrosive grease;The utility model can solve the problem that the cross arm structure of existing transmission tower is deformed easily, poor shock resistance and further affect the bearing strength caused by tension.

Description

Technical Field

[0001] This utility model belongs to the field of wind-resistant reinforcement technology for transmission towers, specifically, it relates to a reinforced crossarm structure for transmission line towers. Background Technology

[0002] In power transmission line engineering, the crossarm structure of traditional transmission line towers is usually welded from angle steel or steel pipes. The conductors are fixed by a simple support structure, which can meet basic power transmission requirements under normal operating conditions. At present, this type of crossarm has been widely used in transmission lines in low-voltage areas and flat terrain. Through standardized design and prefabricated components, rapid construction and cost control have been achieved, which has ensured the stability of power transmission to a certain extent.

[0003] However, with the development of power grid construction towards higher voltage levels and longer-span transmission, and the increasing demands on the safety of transmission lines in complex environments (such as coastal areas with strong winds, high-altitude icing areas, and earthquake zones), the traditional crossarm structure has revealed significant defects. Firstly, its load-bearing capacity is insufficient. When faced with high-tension conductors or extreme loads (such as typhoons and blizzards), the crossarm is prone to bending deformation or even breakage, leading to excessive conductor sag and insufficient safety distance, increasing the risk of short circuits. Secondly, its vibration damping performance is weak, lacking an effective buffering mechanism. Under wind vibration, conductor galloping, or earthquakes, the crossarm and its connections are prone to loosening and cracking due to fatigue. Thirdly, its corrosion resistance is poor. In harsh environments such as salt spray and acid rain, the surface of the metal crossarm is prone to rust, reducing structural strength and shortening its service life. Fourthly, its connection method is rigid and cannot adapt to the thermal expansion and contraction of conductors or minor structural displacements, leading to stress concentration at connection nodes and accelerating structural failure. In summary, under the special environmental and working conditions, the crossarm structure of transmission line towers currently suffers from problems such as easy deformation due to tension, poor seismic resistance, and consequently, reduced load-bearing capacity. Utility Model Content

[0004] This utility model provides a reinforced crossarm structure for transmission line towers, which can solve the problems of easy deformation and poor seismic resistance caused by tension on the crossarm structure of existing transmission towers, thus affecting the load-bearing strength.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a reinforced crossarm structure for a transmission line tower, including a tower body structure and a bottom support base. The tower body structure comprises a main support structure and an outer reinforced crossarm, which are fixedly connected by diagonal braces and connected by a shock-absorbing mechanism. The shock-absorbing mechanism includes a suspended damper. A conductor groove is provided below the reinforced crossarm, and the inner end of the conductor groove is connected to the tower body structure through an elastic connector. An adaptively adjustable buffer component is provided inside the elastic connector. A reinforcing device is provided on the outside of the conductor groove, which includes multiple locking bolts and locking blocks. A sealed anti-corrosion cavity is provided at the connection between the reinforced crossarm, the diagonal braces, and the shock-absorbing mechanism, and the cavity is filled with anti-corrosion grease.

[0007] The technical effects of the reinforced crossarm structure for transmission line towers provided by this utility model are as follows: The main support structure, together with the reinforced crossarm, forms a triangular support system and is combined with elastic connectors to assist in fixing the conductors. Through the shock absorption mechanism, the crossarm structure can withstand greater conductor tension, and vibration buffering is achieved during tension and vibration, reducing the impact on the main body of the tower, the crossarm structure, and the connection points, ensuring the load-bearing strength of the crossarm structure, and making the facility more durable and stable.

[0008] Based on the above technical solution, the reinforced crossarm structure of the transmission line tower of this utility model can be further improved as follows:

[0009] The suspended damper includes an upper hinge seat connected to the reinforcing crossbeam, a lower hinge seat connected to the main support structure, and a viscous damping cylinder disposed between the upper and lower hinge seats, the viscous damping cylinder being filled with high-viscosity silicone oil.

[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the damper is allowed to swing with the crossarm through the hinge seat, thus expanding the vibration reduction range; the internal friction force generated by the high viscosity silicone oil flowing in the viscous damping cylinder can efficiently convert vibration energy into heat energy dissipation, especially for high-frequency small-amplitude vibrations, which have a significant attenuation effect.

[0011] Furthermore, the elastic adaptive connector includes an outer sleeve, an elastic core embedded in the outer sleeve, and an annular rubber buffer layer disposed between the two. The two ends of the elastic core are respectively hinged to the reinforcing crossarm and the tower structure terminal. Axial steel springs are evenly distributed in the annular rubber buffer layer to form a two-stage buffer structure.

[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: through the two-stage buffer structure, the rubber layer combined with the steel spring can absorb the deformation caused by changes in conductor tension or vibration, and avoid stress concentration caused by rigid connection; the hinged design allows the connecting parts to rotate within a certain range, compensating for the small displacement of the crossarm.

[0013] Furthermore, the multiple locking bolts of the reinforcement are evenly distributed circumferentially along the outer side of the wire groove. Each locking bolt has an arc-shaped locking block at its end. The inner side of the locking block is provided with anti-slip teeth and a silicone rubber anti-slip pad layer. The multi-point coordinated fastening improves the wire's anti-slip ability.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by coordinating multiple points to tighten and distribute the pressure on the conductor, excessive force on a single point is avoided; the anti-slip serrations and silicone rubber pad increase the friction and prevent the conductor from slipping under conditions such as strong winds and icing.

[0015] Furthermore, the reinforcing crossbeams, diagonal braces, and main support structure are all made of hot-dip galvanized high-strength alloy steel, with a nano self-cleaning anti-corrosion coating on the surface.

[0016] Furthermore, the sealed corrosion-resistant cavity is a semi-closed structure, including an annular groove opened at the connection end of the reinforced crossbeam, a sealing collar sleeved on the connection part of the diagonal brace or shock absorption mechanism, and a sealing lip provided on the edge of the sealing collar.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the sealed anti-corrosion cavity prevents moisture and salt from entering through the sealing lip, and the lithium-based grease isolates the metal from contact with air, effectively preventing corrosion of the connection parts.

[0018] Furthermore, the diagonal bracing is welded from Q420 high-strength steel plates.

[0019] Furthermore, the bottom of the guide channel is provided with a drainage slope of 3-5%, and the surface of the guide channel is arranged with micro-grooves.

[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the drainage slope allows the accumulated water to flow quickly out of the groove under the action of gravity, avoiding long-term accumulation that leads to aging of the conductor insulation layer; the micro-groove further refines the water flow path and increases the water flow speed, while reducing the risk of icing in cold regions and preventing damage to the conductor due to ice expansion.

[0021] Furthermore, prestressed cables are installed between the reinforcing crossarm and the main support structure. The two ends of the cables are fixed to the outer end of the reinforcing crossarm and the root of the main support structure respectively by anchors. The cables are made of epoxy-coated steel strands, and the initial tension is 30-50% of the design load.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the prestressed cable, through the pre-applied tension force, shares part of the conductor tension, reduces the bending moment and deflection of the reinforced crossarm, and improves the overall stiffness of the structure; the epoxy coating effectively prevents the corrosion of the steel strand and extends the service life of the cable.

[0023] Furthermore, the shock absorption mechanism also includes metal-rubber composite springs installed on both sides of the suspended damper. One end of the composite spring is hinged to the reinforcing crossbeam, and the other end is connected to the main support structure through a ball joint.

[0024] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the metal-rubber composite spring has the high strength of metal and the high elasticity of rubber, and can provide elastic constraints in three directions: horizontal, vertical and torsional. Through the synergistic effect with the suspension damper, it can suppress vibrations in different directions in all directions, and has a significant control effect on multimodal vibrations under complex loads such as typhoons and earthquakes.

[0025] Compared with existing technologies, the beneficial effects of the reinforced crossarm structure for transmission line towers provided by this utility model are as follows: the main support structure, together with the reinforced crossarm, forms a triangular support system and is combined with elastic connectors to assist in fixing the conductors. Through the shock absorption mechanism, the crossarm structure can withstand greater conductor tension, achieving vibration buffering during tension and vibration, reducing the impact on the tower body, crossarm structure, and connections, ensuring the load-bearing strength of the crossarm structure, and making the facility more durable and stable; by further designing the drainage slope, accumulated water flows quickly out of the groove under the action of gravity, avoiding long-term accumulation that leads to aging of the conductor insulation layer; the micro-grooves further refine the water flow path, increase the water flow velocity, and at the same time reduce the risk of icing in cold regions, preventing damage to the conductors due to ice expansion. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a reinforced crossarm structure for a power transmission line tower.

[0028] Figure 2 This is a schematic diagram of the bottom structure of a reinforced crossarm of a transmission line tower;

[0029] Figure 3 A schematic diagram of the structure of the sealed and corrosion-resistant cavity connected above the suspended damper;

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Main support structure; 11. Reinforced crossbeam; 12. Diagonal brace; 13. Suspended damper; 131. Upper hinge seat; 132. Lower hinge seat; 133. Viscous damping cylinder; 14. Wire groove; 141. Guide surface; 15. Outer sleeve; 16. Elastic core column; 17. Annular rubber buffer layer; 18. Axial steel spring; 19. Locking bolt; 20. Locking block; 21. Sealed anti-corrosion cavity; 211. Annular groove; 212. Sealing collar; 213. Sealing lip; 22. Prestressed cable. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figure 1-3 The diagram shows a reinforced crossarm structure for a transmission line tower provided by this utility model, including a tower body structure and a bottom support base. The tower body structure includes a main support structure 10 and an outer reinforced crossarm 11, which are fixedly connected by diagonal braces 12 and connected by a shock-absorbing mechanism. The shock-absorbing mechanism includes a suspended damper 13. A conductor groove 14 is provided below the reinforced crossarm, and the inner end of the conductor groove is connected to the tower body structure through an elastic connector. The elastic connector has an adaptively adjustable buffer component. A reinforcing device is provided on the outside of the conductor groove, which includes multiple locking bolts 19 and locking blocks 20. A sealed anti-corrosion cavity 21 is provided at the connection between the reinforced crossarm, the diagonal brace, and the shock-absorbing mechanism, and the cavity is filled with anti-corrosion grease.

[0034] In the above technical solution, the suspension damper includes an upper hinge seat 131 connected to the reinforcing crossbeam, a lower hinge seat 132 connected to the main support structure, and a viscous damping cylinder 133 disposed between the upper and lower hinge seats, the viscous damping cylinder being filled with high-viscosity silicone oil.

[0035] The suspended damper is installed between the reinforced crossarm and the main support structure. Its upper end is hinged to the bottom of the reinforced crossarm via an upper hinge seat using high-strength bolts, ensuring flexible rotation during vibration. Its lower end is also hinged to the top of the main support structure via a lower hinge seat using high-strength bolts. The viscous damping cylinder is filled with high-viscosity silicone oil. When the crossarm vibrates due to wind vibration, conductor galloping, or earthquakes, the piston reciprocates within the cylinder. The silicone oil generates viscous resistance through the throttling orifice, converting the vibration kinetic energy into heat energy, thereby consuming the vibration energy and attenuating the vertical and part of the horizontal vibration of the crossarm.

[0036] Furthermore, in the above technical solution, the elastic adaptive connector includes an outer sleeve 15, an elastic core column 16 embedded in the outer sleeve, and an annular rubber buffer layer 17 disposed between the two. The two ends of the elastic core column are respectively hinged to the reinforcing crossbeam and the tower structure terminal. Axial steel springs 18 are evenly distributed in the annular rubber buffer layer to form a two-stage buffer structure.

[0037] Furthermore, in the above technical solution, the multiple locking bolts of the reinforcement are evenly distributed circumferentially along the outer side of the wire groove, and each locking bolt is provided with an arc-shaped locking block at its end. The inner side of the locking block is provided with anti-slip teeth and a silicone rubber anti-slip pad is attached. The anti-slip ability of the wire is improved through multi-point coordinated fastening.

[0038] Furthermore, in the above technical solution, the reinforcing crossbeams, diagonal braces, and main support structure are all made of hot-dip galvanized high-strength alloy steel, and the surface is coated with a nano self-cleaning anti-corrosion coating.

[0039] The nano self-cleaning anti-corrosion coating consists of an epoxy zinc-rich primer at the bottom, a fluorocarbon resin coating in the middle, and a titanium dioxide photocatalytic nano layer on the surface. The total thickness is 150-200μm. It has the functions of superhydrophobicity, self-cleaning, and photocatalytic degradation of pollutants.

[0040] Furthermore, in the above technical solution, the sealing and anti-corrosion cavity is a semi-closed structure, including an annular groove 211 opened at the connection end of the reinforcing crossbeam and a sealing collar 212 fitted onto the connection part of the diagonal brace or shock absorber mechanism, with a sealing lip 213 provided on the edge of the sealing collar.

[0041] The annular groove is filled with lithium-based grease.

[0042] Furthermore, in the above technical solution, the diagonal brace is welded from Q420 high-strength steel plate.

[0043] The diagonal bracing adopts a hollow box-section structure with transverse stiffening ribs and longitudinal partitions inside, forming multiple independent cavities. The cavities are filled with lightweight foamed polyurethane material to enhance wind resistance. The hollow box section has high torsional stiffness and bending capacity, which can effectively resist the torsional moment caused by wind load. The use of high-strength steel plates reduces the self-weight of the components and lowers the foundation load while ensuring structural strength.

[0044] Furthermore, in the above technical solution, the bottom of the conductor trough is provided with a guide surface 141 with a drainage slope of 3-5%, and the surface of the guide surface is provided with micro-grooves.

[0045] Furthermore, in the above technical solution, a prestressed cable 22 is installed between the reinforcing crossarm and the main support structure. The two ends of the cable are fixed to the outer end of the reinforcing crossarm and the root of the main support structure respectively by anchors. The cable is made of epoxy-coated steel strand, and the initial tension is 30-50% of the design load.

[0046] Furthermore, in the above technical solution, the shock absorption mechanism also includes metal-rubber composite springs installed on both sides of the suspended damper. One end of the composite spring is hinged to the reinforcing crossbeam, and the other end is connected to the main support structure through a ball joint.

[0047] Metal-rubber composite springs are symmetrically arranged on both sides of the suspended damper, one on each side. One end of the metal-rubber composite spring is hinged to the bottom of the reinforced crossarm via a U-shaped hinge seat, which is fixed to the reinforced crossarm by welding or bolting. The other end is connected to the top of the main support structure via a ball joint, which allows free rotation in three directions. The metal-rubber composite spring is made of metal wire and rubber material, combining the high strength of metal and the high elasticity of rubber. It can absorb energy through its own elastic deformation when the crossarm is subjected to lateral, longitudinal, and torsional vibrations.

[0048] When the crossarm is subjected to vertical vibration, the suspension damper takes priority, consuming most of the energy through viscous damping; the metal-rubber composite spring also undergoes elastic deformation in the vertical direction, assisting in absorbing the remaining energy. When the crossarm is subjected to lateral or longitudinal vibration, the metal-rubber composite spring, with its elastic properties in the horizontal direction, effectively buffers the vibration; at this time, the suspension damper, due to its hinged structure, also participates in suppressing horizontal vibration to some extent. When the crossarm experiences torsional vibration, the ball-jointed metal-rubber composite spring provides elastic resistance from multiple angles, preventing the torsional tendency. Working together with the suspension damper, it forms a comprehensive, multi-dimensional, three-dimensional vibration reduction system, greatly improving the stability of the crossarm in complex vibration environments.

[0049] Specifically, the principle of this utility model is as follows: the main support structure and the reinforcing crossarm form a stable triangular mechanical system through diagonal bracing, effectively dispersing conductor tension, improving overall load-bearing capacity, and ensuring that the structure does not deform or fail under heavy load conditions. The suspended damper in the shock absorption mechanism utilizes the viscous resistance of the silicone oil in the viscous damping cylinder to convert vibration energy into heat energy for consumption. Simultaneously, the metal-rubber composite spring provides three-dimensional elastic constraint through a ball joint connection. These two components work together to achieve multi-directional suppression of vertical, horizontal, and torsional vibrations, reducing structural fatigue damage. The elastic adaptive connector adopts a two-stage buffer structure combining an outer sleeve, an elastic core column, and a rubber buffer layer. Combined with a hinged design, it can adaptively compensate for the deformation caused by conductor thermal expansion and contraction and structural displacement, avoiding stress concentration that could lead to connection failure. The reinforcement device uses multiple locking bolts and locking blocks with anti-slip teeth to secure the conductor from multiple points, preventing the conductor from slipping in severe weather. In terms of corrosion protection, the high-strength alloy steel material combined with the nano self-cleaning anti-corrosion coating improves corrosion resistance from both the material itself and surface protection perspectives. At the same time, the sealed anti-corrosion cavity is filled with anti-corrosion grease through a semi-closed structure, isolating key connection nodes from external corrosive media. Ultimately, this achieves a comprehensive improvement in the crossarm structure's performance in terms of load-bearing capacity, vibration reduction, connection, and corrosion protection.

Claims

1. A reinforced crossarm structure for a transmission line tower, comprising a tower body structure and a bottom support base, characterized in that, The tower structure includes a main support structure and an outer reinforcing crossbeam, which are fixedly connected by diagonal braces and connected by a shock-absorbing mechanism. The shock-absorbing mechanism includes a suspended damper. A wire groove is provided below the reinforcing crossbeam, and the inner end of the wire groove is connected to the tower structure through an elastic connector. The elastic connector is equipped with an adaptive buffer component. The outside of the conductor trough is equipped with a reinforcing device, which includes multiple locking bolts and locking blocks; a sealed anti-corrosion cavity is set at the connection between the reinforcing crossarm and the diagonal brace and the shock absorption mechanism, and the cavity is filled with anti-corrosion grease.

2. The reinforced crossarm structure of a transmission line tower according to claim 1, characterized in that, The suspended damper consists of upper and lower hinge seats and a viscous damping cylinder, which is filled with high-viscosity silicone oil.

3. The reinforced crossarm structure of a transmission line tower according to claim 2, characterized in that, The elastic adaptive connector includes an outer sleeve, an elastic core column, and an annular rubber buffer layer. The two ends of the core column are hinged to the reinforcing crossarm and the tower structure terminal, respectively. The rubber buffer layer contains an axial steel spring, forming a two-stage buffer structure.

4. The reinforced crossarm structure of a transmission line tower according to claim 3, characterized in that, The locking bolts of the reinforcement are evenly distributed along the outer side of the wire groove. Each locking bolt has an arc-shaped locking block at its end, and the inner side of the locking block is provided with anti-slip teeth to improve the wire's anti-slip ability.

5. A reinforced crossarm structure for a transmission line tower according to claim 4, characterized in that, The reinforcing crossbeams, diagonal braces, and main support structure are all made of hot-dip galvanized high-strength alloy steel, with a nano self-cleaning anti-corrosion coating on the surface.

6. A reinforced crossarm structure for a transmission line tower according to claim 5, characterized in that, The sealed corrosion-resistant cavity is a semi-closed structure, including an annular groove opened at the connection end of the reinforced crossbeam, a sealing collar sleeved on the connection part of the diagonal brace or shock absorption mechanism, and a sealing lip provided on the edge of the sealing collar.

7. A reinforced crossarm structure for a transmission line tower according to claim 6, characterized in that, The diagonal bracing is welded from high-strength steel plates.

8. A reinforced crossarm structure for a transmission line tower according to claim 7, characterized in that, The bottom of the guide channel is provided with a drainage slope of 3-5%, and the surface of the guide channel is arranged with micro-grooves.

9. A reinforced crossarm structure for a transmission line tower according to claim 8, characterized in that, A prestressed cable is installed between the reinforcing crossarm and the main support structure. The two ends of the cable are fixed to the outer end of the reinforcing crossarm and the root of the main support structure by anchors. The cable is made of epoxy-coated steel strand, and the initial tension is 30-50% of the design load.

10. A reinforced crossarm structure for a transmission line tower according to claim 9, characterized in that, The shock absorption mechanism also includes metal-rubber composite springs installed on both sides of the suspended damper. One end of the composite spring is hinged to the reinforcing crossbeam, and the other end is connected to the main support structure through a ball joint.

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