Power transmission tower

Abstract

The utility model provides a power transmission tower which comprises a tower body and a composite cross arm arranged on the tower body, the composite cross arm comprises a cross arm insulator and a node fitting, the low-voltage end of the composite cross arm is connected with the tower body, a wire is hung at the high-voltage end of the composite cross arm through the node fitting, the cross arm insulator is detachably and fixedly connected with the node fitting and the tower body, and the node fitting comprises a first connecting fitting and a second connecting fitting, comprising two first flange cylinders and two first flange plates for sealing and covering the two first flange cylinders respectively; a second connection fitting; the two wire hanging hardware fittings are connected to the two opposite ends of the second connecting hardware fitting respectively, the first connecting hardware fitting is connected with the second connecting hardware fitting through the wire hanging hardware fitting arranged close to the tower body, and the two wire hanging hardware fittings are both used for hanging wires; and the two fixing plates are inserted above and below the first flange cylinder respectively, and construction holes are formed in the fixing plates. According to the power transmission tower, the bearing capacity of the node fittings is improved, cost is saved, the cross arm insulators can be independently replaced, and construction and maintenance are facilitated.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and specifically relates to a transmission tower. Background Art

[0002] Currently, for the operation and maintenance of composite cross arms, it is often necessary to separate and lift the conductors, and then remove the entire composite cross arm, transport the entire composite cross arm to the ground for replacing the cross arm insulators, and then hoist the composite cross arm and perform high-altitude assembly. The overall steps are cumbersome, and the construction difficulty is large and the cost is high. At the same time, on the one hand, the existing joint fittings have weak bearing capacity, and on the other hand, the design redundancy leads to large wind loads, wasting costs. Utility Model Content

[0003] In view of this, this application provides a transmission tower, which improves the bearing capacity of the joint fittings, saves costs, the cross arm insulators can be replaced separately, which is beneficial to construction and maintenance, the operation is simple and safe, and the overall efficiency is high.

[0004] To solve the above problems, the technical solution adopted in this application is: to provide a transmission tower, the transmission tower includes a tower body and a composite cross arm arranged on the tower body. The composite cross arm includes cross arm insulators and joint fittings. The low-voltage end of the composite cross arm is connected to the tower body, and the high-voltage end of the composite cross arm hangs the conductor through the joint fittings. The cross arm insulators are detachably fixedly connected to the joint fittings and the tower body. The joint fittings include: a first connection fitting, including two first flange cylinders and two first flange plates respectively covering the two first flange cylinders; a second connection fitting; two hanging fittings, respectively connected to opposite ends of the second connection fitting. The first connection fitting is connected to the second connection fitting through the hanging fitting close to the tower body. Both of the two hanging fittings are used for hanging the conductor; two fixing plates are respectively inserted above and below the first flange cylinder, and construction holes are arranged on the fixing plates.

[0005] Wherein, the fixing plate includes a transition plate and an auxiliary connection plate perpendicular to the transition plate. The auxiliary connection plate is arranged on the plate surface of the transition plate close to the tower body, and construction holes are arranged on the auxiliary connection plate.

[0006] Wherein, the joint fittings further include a reinforcing plate. One end of the reinforcing plate is connected to the plate surface of the transition plate away from the tower body, and the other end is connected to the hanging fitting close to the tower body.

[0007] Wherein, the hanging fitting includes a hanging flange cylinder and a hanging part. The hanging part is arranged on the periphery of the hanging flange cylinder and is connected to the hanging flange cylinder. The central axes of the hanging flange cylinders of the two hanging fittings are on the same straight line.

[0008] Among them, the wire hanging parts are arranged in two, and the two wire hanging parts are distributed on both sides of the wire hanging flange cylinder along the extension direction of the wire, so that the wires located on both sides of the wire hanging flange cylinder are respectively connected to the two wire hanging parts, and at the same time, the wires located on both sides of the wire hanging flange cylinder are electrically connected through jumpers.

[0009] Among them, the two first flange cylinders are symmetrically arranged on both sides of the central axis of the wire hanging flange cylinder.

[0010] Among them, the wire hanging fitting further includes two sealing plates, and the two sealing plates respectively cover the two ends of the wire hanging flange cylinder. In the radial direction of the wire hanging flange cylinder, both sealing plates protrude from the wire hanging flange cylinder.

[0011] Among them, the cross-arm insulator includes two column insulators and two stay insulators. One end of the two column insulators and one end of the two stay insulators are both detachably connected to the tower body, and the stay insulators are located above the column insulators on the tower body. The other ends of the two column insulators and the other ends of the two stay insulators are detachably fixed to the joint fitting.

[0012] Among them, the end fitting of the column insulator includes a second flange cylinder and a second flange plate covering the second flange cylinder. The first flange plate and the second flange plate are correspondingly provided with through holes for passing fasteners to realize the detachable fixed connection between the first connection fitting and the column insulator.

[0013] Among them, the second connection fitting is connected to the triangular connection plate. The triangular connection plate and the end fitting of the stay insulator are correspondingly provided with through holes for passing fasteners to realize the detachable fixed connection between the second connection fitting and the stay insulator. Description of the Drawings

[0014] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0015] Figure 1 is a schematic structural diagram of the connection of the load-bearing device on the transmission tower of the present application;

[0016] Figure 2 is a schematic structural diagram of another embodiment of the connection of the load-bearing device on the transmission tower of the present application;

[0017] Figure 3 is Figure 1 the enlarged schematic diagram at A in

[0018] Figure 4 is Figure 3 the enlarged schematic diagram at B in

[0019] Figure 5 It is an enlarged schematic diagram of the node fitting for hanging conductors in this application. Specific Embodiments

[0020] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0021] In this application, the "connection", unless otherwise clearly defined or limited, shall be understood in a broad sense, which can be directly connected or connected through an intermediate medium. In the description of this application, it should be understood that the orientation or positional relationship indicated by "upper", "lower", "end portion", "one end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0022] Refer to Figure 1 , the transmission tower 10 of this application includes a tower body 20 and a composite cross arm 30 arranged on the tower body 20. The composite cross arm 30 includes cross arm insulators and a node fitting 330. The low-voltage end of the composite cross arm 30 is connected to the tower body 20, and the high-voltage end of the composite cross arm 30 hangs conductors through the node fitting 330. The cross arm insulators include two post insulators 310 and two stay insulators 320. One end of the two post insulators 310 and one end of the two stay insulators 320 are detachably connected to the tower body 20, and the stay insulators 320 are located above the post insulators 310 on the tower body 20. The other ends of the two post insulators 310 and the other ends of the two stay insulators 320 are detachably fixedly connected to the node fitting 330. The two post insulators 310 form a V-shaped structure with the node fitting 330 as the apex angle, and the two stay insulators 320 form a V-shaped structure with the node fitting 330 as the apex angle.

[0023] The tower body 20 can be a transmission tower structure with common structures such as a lattice tower, a pole body, or a composite material tower. Among them, a composite cross arm 30 can be arranged on one side of the tower body 20 (as shown in Figure 1 ), or composite cross arms can be arranged on multiple sides of the tower body 20. Among them, one composite cross arm 30 can be arranged on one side of the tower body 20 (as shown in Figure 1 ), or multiple composite cross arms can be arranged at intervals along the vertical direction.

[0024] The post insulator 310 includes an insulator, an umbrella skirt wrapped around the outer periphery of the insulator, and end fittings provided at both ends of the insulator. The insulator is a composite insulator made of glass fiber impregnated with epoxy resin. The umbrella skirt can be made of materials such as high-temperature vulcanized silicone rubber, liquid silicone rubber, or room-temperature vulcanized silicone rubber, and there is no limitation here. The structure and material of the stay insulator 320 are similar to those of the post insulator 310 and will not be elaborated.

[0025] In this application, the end fittings of the two post insulators 310 are respectively detachably fixedly connected to the node fitting 330, and the end fittings of the two stay insulators 320 are respectively detachably fixedly connected to the node fitting 330. When it is necessary to disassemble the post insulator 310 and the stay insulator 320, only the fasteners between the end fitting and the node fitting 330 need to be removed. While facilitating the disassembly of the post insulator 310 and the stay insulator 320, the overall structure stability of the node fitting 330 can also be maintained. Furthermore, when performing operation and maintenance on the transmission tower 10, each cross-arm insulator can be replaced individually, and there is no need to separate the conductors hung on the transmission tower 10. The operation is simple, safe, with high overall efficiency, simplifies the operation and maintenance process, and also reduces the personal safety risk of the operation and maintenance personnel. The operation and maintenance method of the transmission tower 10 includes:

[0026] S11: Hoist the adjustable-length load-bearing device to the preset working position.

[0027] Use the hoisting mechanism to lift the load-bearing device until the load-bearing device reaches the preset working position close to the tower body 20 and convenient for installation.

[0028] The hoisting mechanism can specifically be a crane, or other common hoisting devices can also be used. The crane uses tools such as a moving winch and a wire rope sleeve to hoist the load-bearing device to a position close to the cross-arm insulator to be replaced on the transmission tower 10, and prepares to install the load-bearing device.

[0029] Before hoisting, the appearance of relevant equipment and tools should be checked to ensure that there are no deformations, cracks, damages, etc. The selected equipment and tools must be regularly inspected.

[0030] S12: Install the load-bearing device, connect one end of the load-bearing device to the tower body 20, and the other end to the high-voltage end of the composite cross-arm 30.

[0031] The tower body 20 is provided with a first construction hole, the high-voltage end of the composite cross-arm 30 is provided with a second construction hole, and both ends of the load-bearing device are respectively provided with a first installation hole corresponding to the first construction hole and a second installation hole corresponding to the second construction hole, so as to facilitate the two ends of the load-bearing device to be fixedly connected to the tower body 20 and the high-voltage end of the composite cross-arm 30 respectively, and make the load-bearing device located between the tower body 20 and the high-voltage end of the composite cross-arm 30.

[0032] Preferably, one end of the load-bearing device is fixedly connected to the high-voltage end of the composite cross arm 30 first, and then the other end of the load-bearing device is fixedly connected to the tower body 20. Since the length of the load-bearing device is adjustable, the initial length of the load-bearing device can be set arbitrarily before installing the load-bearing device. After the second installation hole at one end of the load-bearing device corresponds to and matches the second construction hole at the high-voltage end of the composite cross arm 30, they are fixedly connected by fasteners. Then, adjust the length of the load-bearing device so that the first installation hole at the other end of the load-bearing device exactly corresponds to the first construction hole of the tower body 20, and then fixedly connect them by fasteners to complete the installation of the load-bearing device.

[0033] Further, the load-bearing device includes an adjusting member, a load-bearing member, and a connecting member connected in sequence. The length of the adjusting member is adjustable, and a first installation hole is provided on the adjusting member, and a second installation hole is provided on the connecting member. The load-bearing device is connected to the high-voltage end of the composite cross arm 30 through the connecting member, and the load-bearing device is connected to the tower body 20 through the adjusting member.

[0034] S13: Adjust the length of the load-bearing device to relax the cross-arm insulator to be replaced, and remove the cross-arm insulator to be replaced.

[0035] Among them, the length of the load-bearing device is adjustable through the adjusting member. After the load-bearing device is installed, adjust the length of the load-bearing device again to relax the cross-arm insulator, that is, the load on the cross-arm insulator is transferred to the load-bearing device, so that the cross-arm insulator can be disassembled and replaced.

[0036] After the cross-arm insulator to be replaced is relaxed, remove the fasteners such as bolts and nuts on the cross-arm insulator, and then remove the cross-arm insulator to be replaced.

[0037] S14: Install a new cross-arm insulator.

[0038] After removing the original cross-arm insulator, keep the position of the load-bearing device unchanged, and continue to install a new cross-arm insulator at the original position of the cross-arm insulator until the structure of the new cross-arm insulator is stable.

[0039] S15: Remove the load-bearing device.

[0040] Adjust the length of the load-bearing device to transfer the load on the load-bearing device back to the new cross-arm insulator. When the load-bearing device is not stressed, remove the fasteners connecting both ends of the load-bearing device to disconnect the load-bearing device from the transmission tower 10, and the replacement of the cross-arm insulator can be completed.

[0041] The above operation and maintenance method can replace the cross-arm insulator with power on or power off. When replacing the cross-arm insulator with power on, the construction personnel wear shielding clothing for equipotential operation, and tools made of insulating materials are required throughout the operation and maintenance process, including the load-bearing device used. When replacing the cross-arm insulator with power off, before step S11, it further includes S01: performing a power-off operation on the transmission tower 10. That is, before starting the operation and maintenance, it is ensured that the transmission tower 10 is powered off to ensure the safety of the operation and maintenance process. At the same time, the above operation and maintenance method does not require removing the suspended conductor, that is, there is no need to perform temporary suspension treatment on the conductor, and naturally there is no need to use the ground wire support or the upper-phase composite cross-arm, etc. to temporarily suspend the conductor. While protecting the conductor and avoiding bumping the conductor, unnecessary structural design is omitted, the overall structure of the transmission tower 10 is optimized, the operation and maintenance steps are simplified, the operation and maintenance efficiency is improved, and the cost is saved.

[0042] Combined with Figure 3 , the joint fitting 330 includes a first connection fitting 331, a second connection fitting 332, and two wire hanging fittings 333. The two wire hanging fittings 333 are respectively connected to opposite ends of the second connection fitting 332, and the length of the second connection fitting 332 can be adjusted according to the required distance between the two wire hanging fittings 333. The first connection fitting 331 is connected to the second connection fitting 332 through the wire hanging fitting 333 disposed close to the tower body 20, and both of the two wire hanging fittings 333 are used for hanging the conductor. Integrating the two wire hanging fittings 333 into one joint fitting 330 can reduce the layer spacing, compress the overall size of the tower head of the transmission tower 10, improve the electromagnetic environment of the transmission tower 10, reduce the wind load of the transmission tower 10, and save the manufacturing cost at the same time. Among them, the post insulator 310 is connected to the first connection fitting 331, and the stay insulator 320 is connected to the first connection fitting 331 or the second connection fitting 332.

[0043] The wire hanging fitting 333 includes a wire hanging flange cylinder 3331 and a wire hanging portion 3332. The wire hanging portion 3332 is disposed on the periphery of the wire hanging flange cylinder 3331 and connected to the wire hanging flange cylinder 3331 for hanging the conductor. The wire hanging fitting 333 includes two wire hanging portions 3332, and the two wire hanging portions 3332 are distributed on both sides of the wire hanging flange cylinder 3331 along the extending direction of the conductor, so that the conductors located on both sides of the wire hanging flange cylinder 3331 are respectively connected to the two wire hanging portions 3332, and at the same time, the conductors located on both sides of the wire hanging flange cylinder 3331 are electrically connected through a jumper wire. Among them, the central axes of the wire hanging flange cylinders 3331 of the two wire hanging fittings 333 are on the same straight line.

[0044] In an embodiment, referring to Figure 5, the node fitting 330 is connected to the triangular link plate through the insulator string 336 to hang the conductor. The setting of the insulator string 336 allows the current to be transmitted through the jumper wire without being shunted to the node fitting 330, avoiding the problem of reduced service life of the node fitting 330 due to heating. In other embodiments, the node fitting can also be directly connected to connection fittings such as the triangular link plate according to the actual working conditions to hang the conductor.

[0045] The wire hanging fitting 333 further includes two sealing plates 3333. The two sealing plates 3333 respectively cover the two ends of the wire hanging flange cylinder 3331. In the radial direction of the wire hanging flange cylinder 3331, both of the two sealing plates 3333 protrude from the wire hanging flange cylinder 3331. At the same time, the wire hanging part 3332 is located between the two sealing plates 3333, which is beneficial to improving the radial structural strength of the wire hanging flange cylinder 3331, reducing the wall thickness of the wire hanging flange cylinder 3331, lowering the material cost, and preventing water vapor from invading the inside of the wire hanging flange cylinder 3331.

[0046] The first connection fitting 331 includes two first flange cylinders 3311 and two first flange plates 3312 that respectively cover the two first flange cylinders 3311. The first flange plates 3312 are arranged away from the wire hanging fitting 333. One end of each of the two first flange cylinders 3311 is connected to one of the wire hanging fittings 333, and the other end is respectively connected to the ends of the two post insulators 310 that are not connected to the tower body 20 through the first flange plates 3312. Specifically, the end fitting of the post insulator 310 includes a second flange cylinder 3211 and a second flange plate 3212 that covers the second flange cylinder 3211. The second flange plate 3212 is arranged away from the post insulator 310. The first flange plates 3312 and the second flange plates 3212 are provided with through holes correspondingly. The detachable fixed connection between the first connection fitting 331 and the post insulator 310 can be realized by passing fasteners through the correspondingly arranged through holes. Among them, one ends of the two first flange cylinders 3311 close to the wire hanging fitting 333 are close to each other so that the two first flange cylinders 3311 are combined and connected to the wire hanging fitting 333, and the other ends of the two first flange cylinders 3311 are separated from each other on the side away from the wire hanging fitting 333, which is convenient for the connection between the two post insulators 310 and the two first flange cylinders 3311.

[0047] Preferably, the two first flange cylinders 3311 are symmetrically arranged on both sides of the central axis of the wire hanging flange cylinder 3331 of the wire hanging fitting 333, which can ensure the balanced force of the overall structure formed by the connection between the two first flange cylinders 3311 and the two post insulators 310.

[0048] For the convenience of operation and maintenance, one end of the stay insulator 320 that is not connected to the tower body 20 is connected to the second connecting fitting 332. The second connecting fitting 332 is connected to the triangular gusset plate 3321. Through holes are correspondingly provided on the triangular gusset plate 3321 and the end fitting of the stay insulator 320. The detachable fixed connection between the second connecting fitting 332 and the stay insulator 320 can be realized by passing a fastener through the correspondingly provided through holes.

[0049] In one embodiment, a second construction hole is provided on the triangular gusset plate 3321 of the node fitting 330 for connecting the load-bearing device. The second construction hole is located on the axis of symmetry of the triangular gusset plate 3321, which can not only ensure that the load-bearing device will not interfere with the cross-arm insulator when installed on the node fitting 330, but also ensure the balanced force of the entire connection structure.

[0050] In another embodiment, combined with Figure 4 , the second construction hole can also be set by installing a fixing plate 334 on the node fitting 330. The load-bearing device is connected to the fixing plate 334 through the second construction hole, and then the load-bearing device is fixedly connected to the node fitting 330. The node fitting 330 includes two fixing plates 334, which are respectively inserted above and below the first flange cylinder 3311. Each fixing plate 334 includes a transition plate 3341 and an auxiliary connecting plate 3342 vertically connected to the transition plate 3341. The plate surface of the transition plate 3341 is parallel to the plate surface of the sealing plate 3333 on the suspension fitting 333. The auxiliary connecting plate 3342 is arranged on the plate surface of the transition plate 3341 close to the tower body 20. In this embodiment, the number of the auxiliary connecting plates 3342 is two, and the two auxiliary connecting plates 3342 are perpendicularly arranged. In other embodiments, the number of the auxiliary connecting plates can also be one, and the auxiliary connecting plate is perpendicular to the transition plate. At this time, the fixing plate is a plate member with a T-shaped cross-section. Of course, the auxiliary connecting plate can also be arranged at other positions of the transition plate as long as it does not interfere with the post insulator, and no limitation is made here. The second construction hole is arranged on the auxiliary connecting plate 3342, which can not only ensure that the load-bearing device will not interfere with the cross-arm insulator when installed on the node fitting 330, so as to install the load-bearing device more conveniently, but also ensure the balanced force of the entire connection structure. In other embodiments, the second construction hole can also be set on other components of the node fitting to connect the load-bearing device, and no limitation is made here.

[0051] The node fitting 330 further includes a reinforcing plate 335. The reinforcing plate 335 is in an irregular shape. One end of the reinforcing plate 335 is connected to the plate surface of the transition plate 3341 away from the tower body 20, and the other end is connected to the sealing plate 3333 of the suspension fitting 333 arranged close to the tower body 20, further connecting and fixing the fixing plate 334 to the suspension fitting 333, making the structure of the fixing plate 334 more stable. Meanwhile, the side surface of the reinforcing plate 335 is connected to the suspension flange cylinder 3331 of the suspension fitting 333 arranged close to the post insulator 310. Two reinforcing plates 335 are provided, respectively located above and below the suspension flange cylinder 3331.

[0052] In this application, the end fittings of the two post insulators 310 are detachably and fixedly connected to the first connecting fitting 331, and the end fittings of the two stay insulators 320 are detachably and fixedly connected to the second connecting fitting 332. When it is necessary to disassemble the post insulator 310 and the stay insulator 320, only the fasteners between the end fitting and the node fitting 330 need to be removed. While facilitating the disassembly of the post insulator 310 and the stay insulator 320, the overall structure stability of the node fitting 330 can also be maintained.

[0053] Refer to Figure 1 , in an embodiment, in order to replace the post insulator 310, the load-bearing device in step S11 is set as two first load-bearing devices 141. Before step S11, prepare two first load-bearing devices 141; execute step S11, use the hoisting mechanism to lift the first load-bearing device 141 until the first load-bearing device 141 reaches a preset working position close to the tower body 20 and convenient for installation; execute step S12, install the two first load-bearing devices 141 between the tower body 20 and the node fitting 330, and the two first load-bearing devices 141 are at different heights on the central axis plane of the two post insulators 310, so that the force on the node fitting 330 in each direction can be balanced, and the stability of the entire connection structure is improved.

[0054] In other embodiments, the number of the first load-bearing devices can also be one, three or more. The specific number is determined in combination with the shape of the node fitting and the size specifications of the post insulator, which should not only meet the convenience of connecting with the node fitting, but also be able to meet the connection strength.

[0055] Before step S12, two first construction holes (not shown in the figure) are provided on the tower body 20. The two first construction holes are arranged at intervals in the vertical direction, that is, the centers of the two first construction holes are located on the same vertical line, and the two first construction holes are located at the middle positions of the connections between the two post insulators 310 and the tower body 20. One end of each of the two first load-bearing devices 141 is fixedly connected to the tower body 20 through the two first construction holes respectively, and the other end is fixedly connected to the joint fitting 330. Of course, one, three or more first construction holes can also be provided on the tower body 20, which specifically corresponds to the number of the first load-bearing devices 141 and is convenient for connecting the first load-bearing devices 141 and the tower body 20.

[0056] In this embodiment, a second construction hole is provided on the auxiliary connection plate 3342 of the fixing plate 334 for connecting the first load-bearing device 141. Among them, a plurality of groups of auxiliary clamping plates 143 are provided to cooperate with the connection of the auxiliary connection plate 3342 and the first connecting member provided at the end of the first load-bearing device 141. The first connecting member includes a plurality of insertion plates, and each insertion plate is provided with a second installation hole. The plurality of insertion plates are respectively fixedly inserted at one end of the plurality of groups of auxiliary clamping plates 143, and the auxiliary connection plate 3342 of the fixing plate 334 is respectively fixedly inserted at the other end of the plurality of groups of auxiliary clamping plates 143. A plurality of through holes are provided on the auxiliary clamping plate 143. In step S12, the mutual connection between the first load-bearing device 141 and the joint fitting 330 can be realized by passing fasteners through the through holes and the second construction holes and passing fasteners through the through holes and the second installation holes.

[0057] Furthermore, a plurality of through holes are provided on the auxiliary clamping plate 143. The shape and size of each through hole are the same, and each through hole is located at a different position on the auxiliary clamping plate 143. Any through hole on the auxiliary clamping plate 143 can be selected to be fixedly connected to the second construction hole provided on the auxiliary connection plate 3342 and the second installation hole provided on the first connecting member 1413. Define the through holes on the auxiliary clamping plate 143 used to connect the auxiliary connection plate 3342 and the first connecting member 1413 in one case as a group of through holes. Then, the through holes on the auxiliary clamping plate 143 can be divided into multiple groups, and each group of through holes can be used to fixedly connect the auxiliary connection plate 3342 and the first connecting member, so that the relative distance between the auxiliary connection plate 3342 and the first connecting member is adjustable, increasing the redundancy of installation, reducing the installation difficulty, and improving the installation efficiency.

[0058] In this embodiment, the number of the insertion plates is four, and each insertion plate is vertically arranged on the end face of the first load-bearing device 141 close to the joint fitting 330. The number of the auxiliary clamping plates 143 is four groups. In other embodiments, the number and structure of the insertion plates arranged at the end of the first load-bearing device, the auxiliary connecting plates arranged on the fixing plate, and the corresponding auxiliary clamping plates can also be determined according to actual situations, as long as they can cooperate to realize the connection between the load-bearing device and the joint fitting. Of course, the first load-bearing device can also be connected by arranging a second construction hole on other components of the joint fitting, as long as it is convenient to connect the joint fitting and can meet the connection strength, and no limitation is made here.

[0059] In another embodiment, in combination with Figure 2 , in order to replace the stay insulator 320, the load-bearing device in step S11 is set as the second load-bearing device 142. Before step S11, prepare a second load-bearing device 142; execute step S11, use the hoisting mechanism to lift the second load-bearing device 142 until the second load-bearing device 142 reaches a preset working position close to the tower body 20 and convenient for installation; execute step S12, install the second load-bearing device 142 in the middle of the two stay insulators 320, so that the two stay insulators 320 are symmetrical about the central axis plane of the second load-bearing device 142. The two stay insulators 320 and the tower body 20 form an isosceles triangle structure, and the second load-bearing device 142 is located on the median line of the base of the isosceles triangle, so that the forces on the joint fitting 330 in all directions can be balanced, and the stability of the entire connection structure is improved.

[0060] In other embodiments, the number of the second load-bearing devices can also be two, three or more. The specific number is determined in combination with the shape of the joint fitting and the size specifications of the stay insulators, which should not only meet the convenience of connecting with the joint fitting, but also be able to meet the connection strength.

[0061] Before step S12, set a first construction hole (not shown in the figure) on the tower body 20. One first construction hole is located at the middle position of the connection between the two stay insulators 320 and the tower body 20. One end of the second load-bearing device 142 is fixedly connected to the tower body 20 through the first construction hole, and the other end is fixedly connected to the joint fitting 330. Of course, two, three or more first construction holes can also be set on the tower body 20, which specifically correspond to the number of the second load-bearing devices 142 and are convenient for connecting the second load-bearing device 142 and the tower body 20.

[0062] In this embodiment, a second construction hole is set on the triangular link plate 3321 of the joint fitting 330 for connecting the second load-bearing device 142. In other embodiments, the second load-bearing device can also be connected by setting a second construction hole on other components of the joint fitting.

[0063] Advantages of the present application: The joint fitting of the present application includes two wire suspension fittings, which can improve the load-bearing capacity of the joint fitting, compress the overall deflection of the tower head of the transmission tower, reduce the layer spacing of the transmission lines, improve the electromagnetic environment of the transmission tower, reduce the wind load of the transmission tower, and save costs.

[0064] At the same time, the post insulator and the stay insulator are both detachably and fixedly connected to the joint fitting through the connecting fitting. During operation and maintenance, each cross-arm insulator can be replaced individually, and there is no need to separate the conductors hung on the transmission tower. The operation is simple, safe, and highly efficient as a whole. It simplifies the operation and maintenance process and also reduces the personal safety risk of the operation and maintenance personnel.

[0065] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A transmission tower, characterized in that, The transmission tower includes a tower body and a composite cross arm arranged on the tower body. The composite cross arm includes cross-arm insulators and joint fittings. The low-voltage end of the composite cross arm is connected to the tower body, and the high-voltage end of the composite cross arm hangs a conductor through the joint fittings. The cross-arm insulators are detachably fixedly connected to the joint fittings and the tower body. The joint fittings include: A first connection fitting, including two first flange cylinders and two first flange plates respectively covering the two first flange cylinders; A second connection fitting; Two wire-hanging fittings, respectively connected to opposite ends of the second connection fitting. The first connection fitting is connected to the second connection fitting through the wire-hanging fitting arranged close to the tower body. Both of the two wire-hanging fittings are used for hanging the conductor; Two fixing plates, respectively inserted above and below the first flange cylinder, and construction holes are arranged on the fixing plates.

2. The transmission tower according to claim 1, characterized in that, The fixing plate includes a transition plate and an auxiliary connection plate perpendicular to the transition plate. The auxiliary connection plate is arranged on the surface of the transition plate close to the tower body, and the construction hole is arranged on the auxiliary connection plate.

3. The transmission tower according to claim 2, wherein The joint fittings further include a reinforcing plate. One end of the reinforcing plate is connected to the surface of the transition plate away from the tower body, and the other end is connected to the wire-hanging fitting arranged close to the tower body.

4. The transmission tower according to claim 1, wherein The wire-hanging fitting includes a wire-hanging flange cylinder and a wire-hanging part. The wire-hanging part is arranged on the periphery of the wire-hanging flange cylinder and connected to the wire-hanging flange cylinder. The central axes of the wire-hanging flange cylinders of the two wire-hanging fittings are on the same straight line.

5. The transmission tower according to claim 4, characterized in that, The wire-hanging part is arranged in two. The two wire-hanging parts are distributed on both sides of the wire-hanging flange cylinder along the extension direction of the conductor, so that the conductors on both sides of the wire-hanging flange cylinder are respectively connected to the two wire-hanging parts, and at the same time, the conductors on both sides of the wire-hanging flange cylinder are electrically connected through a jumper wire.

6. The transmission tower according to claim 4, wherein, The two first flange cylinders are symmetrically arranged on both sides of the central axis of the wire-hanging flange cylinder.

7. The transmission tower according to claim 4, wherein, The wire-hanging fitting further includes two sealing plates, which respectively cover both ends of the wire-hanging flange cylinder. In the radial direction of the wire-hanging flange cylinder, both of the two sealing plates protrude from the wire-hanging flange cylinder.

8. The transmission tower according to claim 1, characterized in that, The cross-arm insulators include two post insulators and two stay insulators. One end of each of the two post insulators and one end of each of the two stay insulators are detachably connected to the tower body, and the stay insulators are located above the post insulators on the tower body. The other ends of the two post insulators and the other ends of the two stay insulators are detachably fixedly connected to the joint fittings.

9. The transmission tower according to claim 8, characterized in that, The end fitting of the post insulator includes a second flange cylinder and a second flange plate covering the second flange cylinder. Through holes are correspondingly arranged on the first flange plate and the second flange plate for passing through fasteners to realize the detachable fixed connection between the first connection fitting and the post insulator.

10. The transmission tower according to claim 8, characterized in that, The second connection fitting is connected to a triangular link plate. Through holes are correspondingly arranged on the triangular link plate and the end fitting of the stay insulator for passing through fasteners to realize the detachable fixed connection between the second connection fitting and the stay insulator.

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