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, and the cross arm insulator is detachably and fixedly connected with the node fitting and the tower body. The node fitting comprises two clamping plates which are arranged in parallel, and two outer plate surfaces, opposite to each other, of the two clamping plates are connected with fixing plates respectively. The node fitting of the power transmission tower is simple in structure, convenient to machine, beneficial to construction and maintenance, simple and safe to operate and high in overall efficiency, and the cross arm insulator can be independently replaced.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and particularly 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 first, then remove the entire composite cross arm, transport the entire composite cross arm to the ground for replacing the cross arm insulators, and then lift the composite cross arm and assemble it at high altitude. The overall steps are cumbersome, the construction difficulty is high, and the cost is high. At the same time, the existing joint fittings have a complex structure and occupy a large space, which is not conducive to construction and maintenance. Summary of the Utility Model

[0003] In view of this, this application provides a transmission tower with simple joint fittings structure, which is easy to process, conducive to construction and maintenance. The cross arm insulators can be replaced separately, with simple and safe operation and high overall efficiency.

[0004] To solve the above problems, the technical solution adopted in this application is: to provide a transmission tower, which 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 conductors through the joint fittings. The cross arm insulators are detachably fixed to the joint fittings and the tower body. The joint fittings include two parallel clamping plates, and fixing plates are respectively connected to the two outer plate surfaces of the two clamping plates facing away from each other.

[0005] Wherein, construction holes are arranged on the fixing plates.

[0006] Wherein, auxiliary connecting pieces are installed on the fixing plates, and construction holes are arranged on the auxiliary connecting pieces.

[0007] Wherein, the auxiliary connecting piece is a T-shaped plate, and the auxiliary connecting piece is detachably connected to the fixing plate.

[0008] Wherein, reinforcing ribs are arranged between the outer plate surfaces of the clamping plates and the two plate surfaces of the fixing plates facing away from each other.

[0009] Wherein, the cross arm insulators include a post insulator and a stay insulator. One end of the post insulator and one end of the stay insulator are both detachably connected to the tower body, and the stay insulator is located above the post insulator on the tower body. The other end of the post insulator and the other end of the stay insulator are detachably fixed to the joint fittings.

[0010] Wherein, the other end of the post insulator and the other end of the stay insulator are inserted between the two clamping plates through connecting fittings and fixed by fasteners.

[0011] Wherein, an end fitting is provided at the other end of the post insulator. The end fitting includes: a flange cylinder which is axially arranged as a hollow structure; a first sealing plate which seals the end of the flange cylinder away from the post insulator, and a plurality of first connection holes are provided on the first sealing plate.

[0012] Wherein, the connection fitting connected to the post insulator is a post connection fitting. The post connection fitting includes a second sealing plate and a first insertion plate. A plurality of second connection holes corresponding to the plurality of first connection holes are provided on the second sealing plate, and the first insertion plate is vertically arranged on the plate surface of the second sealing plate away from the post insulator.

[0013] Wherein, the connection fitting connected to the stay insulator is a stay connection fitting. An end fitting is provided at the other end of the stay insulator. The end fitting has two connection lugs arranged relatively parallel to each other, and a fifth connection hole is provided on the connection lug for connecting the stay connection fitting. BRIEF 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 a transmission tower according to an embodiment of the present application;

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

[0017] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0018] Figure 4 is a schematic diagram of the load-bearing device in an application scenario;

[0019] Figure 5 is a schematic diagram of the load-bearing device in another application scenario;

[0020] Figure 6 is a schematic structural diagram of another embodiment of the connection of a load-bearing device on a transmission tower according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0022] As used in this application, the term "connection" should be understood in a broad sense unless otherwise clearly defined or limited. It 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", "one end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It 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 should not be construed as a limitation to this application.

[0023] Refer to Figure 1 , the present application provides a transmission tower 10, which includes a tower body 110 and a composite cross arm arranged on the tower body 110. The composite cross arm includes a cross arm insulator 120 and a joint fitting 130. The low-voltage end of the composite cross arm is connected to the tower body 110, and the high-voltage end of the composite cross arm hangs a conductor 101 through the joint fitting 130. The cross arm insulator 120 includes a post insulator 1210 and a stay insulator 1220. One end of the post insulator 1210 and one end of the stay insulator 1220 are both detachably connected to the tower body 110, and the stay insulator 1220 is located above the post insulator 1210 on the tower body 110. The other end of the post insulator 1210 and the other end of the stay insulator 1220 are detachably fixed to the joint fitting 130.

[0024] The tower body 110 can be a transmission tower structure with common structures such as a lattice tower, a pole, or a composite material tower. A composite cross arm can be arranged on one side of the tower body 110 (as shown in Figure 1 ), or composite cross arms can be arranged on multiple sides of the tower body 110. Among them, one composite cross arm can be arranged on one side of the tower body 110 (as shown in Figure 1 ), or multiple composite cross arms can be arranged at intervals in the vertical direction.

[0025] Refer to Figure 1 and Figure 3, the node fitting 130 includes two clamping plates 131 arranged in parallel. Connection fittings are provided at the other ends of the post insulator 1210 and the stay insulator 1220. The post insulator 1210 and the stay insulator 1220 are respectively inserted between the two clamping plates 131 through the connection fittings and fixed by fasteners, so that the post insulator 1210 and the stay insulator 1220 are both connected to the node fitting 130. A wire hanging hole is provided at the bottom of the clamping plate 131, and a wire hanging fitting is arranged in the wire hanging hole through a fastener for hanging the conductor 101.

[0026] The clamping plate 131 is a plate-shaped member. The clamping plate 131 can be a rectangular plate member, a circular plate member or other special-shaped plate members. The two clamping plates 131 are arranged in parallel, and a certain gap is left between the two clamping plates 131 for clamping the connection fitting. In this application, the clamping plate 131 is a special-shaped plate member, specifically a polygonal plate member, which is convenient for connecting with other components. At the same time, the size of the plate surface of the clamping plate 131 is minimized as much as possible to reduce the weight of the clamping plate 131, thereby reducing the weight of the node fitting 130 and lowering the cost. In this application, the node fitting 130 is composed of two parallel clamping plates 131, and a certain gap is left between the two clamping plates 131. Compared with the node fitting composed of a single flat plate with the same total thickness, the cross-sectional coefficient of the node fitting 130 of this application around the neutral axis is larger, with higher bending moment resistance, and can extend the service life of the node fitting 130.

[0027] Since the post insulator 1210 and the stay insulator 1220 are both detachably fixed to the tower body 110 and the node fitting 130, during the operation and maintenance of the transmission tower 10, each cross-arm insulator 120 can be replaced separately, 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. Combined Figures 1 to 3 , Figure 2 is a schematic structural diagram of the transmission tower 10 installed with the load-bearing device 140 during operation and maintenance. The operation and maintenance method of the transmission tower 10 includes:

[0028] S11: Hoist the load-bearing device 140 with adjustable length to the preset working position.

[0029] Use the hoisting mechanism to lift the load-bearing device 140 until the load-bearing device 140 reaches the preset working position close to the tower body 110 and convenient for installation.

[0030] 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 140 to a position close to the cross-arm insulator 120 to be replaced on the transmission tower 10, and prepares to install the load-bearing device 140.

[0031] Before hoisting, the appearance of relevant equipment and tools shall be inspected to ensure that there are no deformations, cracks, damages, etc. The selected equipment and tools must be inspected regularly.

[0032] S12: Install the load-bearing device 140, connect one end of the load-bearing device 140 to the tower body 110, and the other end to the high-voltage end of the composite cross arm.

[0033] The tower body 110 is provided with a first construction hole, the high-voltage end of the composite cross arm is provided with a second construction hole, and both ends of the load-bearing device 140 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 fixed connection of both ends of the load-bearing device 140 to the tower body 110 and the high-voltage end of the composite cross arm respectively, and make the load-bearing device 140 located between the tower body 110 and the high-voltage end of the composite cross arm.

[0034] In an embodiment, fixing plates 132 are respectively connected to two outer plate surfaces of the two splints 131 facing away from each other, and a second construction hole is provided on the fixing plate 132 for connecting the load-bearing device 140.

[0035] In another embodiment, refer to Figure 3 ., an auxiliary connecting member 134 can also be installed on the fixing plate 132. The connection between the fixing plate 132 and the auxiliary connecting member 134 is realized by setting corresponding through holes on the fixing plate 132 and the auxiliary connecting member 134 and passing fasteners through the through holes. A second construction hole is provided on the auxiliary connecting member 134, and the load-bearing device 140 is fixedly connected to the auxiliary connecting member 134 through the second construction hole, and then the load-bearing device 140 is fixedly connected to the joint fitting 130. By providing the auxiliary connecting member 134, it can be avoided that when the load-bearing device 140 is directly installed on the fixing plate 132 of the joint fitting 130, interference occurs with the joint fitting 130 or the cross-arm insulator 120, so as to install the load-bearing device 140 more conveniently.

[0036] In this embodiment, the auxiliary connecting member 134 is a T-shaped plate, and the detachable connection between the auxiliary connecting member 134 and the fixing plate 132 is realized by the cooperation of bolts and nuts, so that the auxiliary connecting member 134 can be removed and reused; in other embodiments, the load-bearing device can also be directly connected by setting a second construction hole on the fixing plate or other components of the joint fitting, which is not limited herein.

[0037] Preferably, one end of the load-bearing device 140 is fixedly connected to the high-voltage end of the composite cross arm first, and then the other end of the load-bearing device 140 is fixedly connected to the tower body 110. Since the length of the load-bearing device 140 is adjustable, before installing the load-bearing device 140, the initial length of the load-bearing device 140 can be set arbitrarily. After the second installation hole at one end of the load-bearing device 140 corresponds to and matches the second construction hole at the high-voltage end of the composite cross arm, they are fixedly connected by fasteners. Then, adjust the length of the load-bearing device 140 so that the first installation hole at the other end of the load-bearing device 140 exactly corresponds to the first construction hole of the tower body 110, and then fixedly connect them through fasteners to complete the installation of the load-bearing device 140.

[0038] Further, the load-bearing device 140 includes an adjusting member, a load-bearing member, and a connecting member connected in sequence. The length of the adjusting member is adjustable, 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 140 is connected to the high-voltage end of the composite cross arm through the connecting member, and the load-bearing device 140 is connected to the tower body 110 through the adjusting member.

[0039] S13: Adjust the length of the load-bearing device 140 to relax the cross-arm insulator 120 to be replaced, and remove the cross-arm insulator 120 to be replaced.

[0040] Among them, the length of the load-bearing device 140 is adjustable through the adjusting member. After the load-bearing device 140 is installed, adjust the length of the load-bearing device 140 again to relax the cross-arm insulator 120, that is, the load on the cross-arm insulator 120 is transferred to the load-bearing device 140, so that the cross-arm insulator 120 can be disassembled and replaced.

[0041] After the cross-arm insulator 120 to be replaced is relaxed, remove the fasteners such as bolts and nuts on the cross-arm insulator 120, and then remove the cross-arm insulator 120 to be replaced.

[0042] S14: Install a new cross-arm insulator 120.

[0043] After removing the original cross-arm insulator 120, keep the position of the load-bearing device 140 unchanged, and continue to install a new cross-arm insulator 120 at the position of the original cross-arm insulator 120 until the structure of the new cross-arm insulator 120 is stable.

[0044] S15: Remove the load-bearing device 140.

[0045] Adjust the length of the load-bearing device 140 to transfer the load on the load-bearing device 140 back to the new cross-arm insulator 120. After the load-bearing device 140 is not stressed, remove the fasteners connecting both ends of the load-bearing device 140 to disconnect the load-bearing device 140 from the transmission tower 10, and the replacement of the cross-arm insulator 120 can be completed.

[0046] The above operation and maintenance method can replace the cross-arm insulator 120 with power on or power off. When replacing the cross-arm insulator 120 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 140 used. When replacing the cross-arm insulator 120 with power off, before step S11, it also 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 101, that is, there is no need to perform temporary suspension treatment on the conductor 101, 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 101. While protecting the conductor 101 and avoiding bumping the conductor 101, unnecessary structural designs are 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 costs are saved.

[0047] Continue to refer to Figure 3 , reinforcing ribs 133 are provided between the outer plate surface of the clamping plate 131 and the two plate surfaces opposite to the fixing plate 132, that is, the two reinforcing ribs 133 are respectively arranged between the two plate surfaces at the fixed connection of the clamping plate 131 and the fixing plate 132. By providing the reinforcing ribs 133, the connection strength between the fixing plate 132 and the clamping plate 131 can be further increased, so that when the load-bearing device 140 is fixed on the joint fitting 130, the phenomenon that the load-bearing device 140 falls off due to the fracture of the fixing plate 132 will not occur, further eliminating potential safety hazards.

[0048] The clamping plate 131, the fixing plate 132 and the reinforcing ribs 133 can be connected by welding after being separately formed, or can be directly integrally formed, which is not limited here.

[0049] The post insulator 1210 and the stay insulator 1220 are both inserted between two clamping plates 131 through connecting fittings, so that the post insulator 1210 and the stay insulator 1220 are respectively connected to the joint fitting 130. Among them, the connecting fitting connected to the post insulator 1210 is the post connecting fitting 1230, that is, the joint fitting 130 is detachably and fixedly connected to the other end of the post insulator 1210 through the post connecting fitting 1230. The post insulator 1210 includes an insulator and end fittings sleeved at both ends of the insulator. The end fitting at the other end of the post insulator 1210 includes a flange cylinder 12111 and a first sealing plate 12112. The flange cylinder 12111 is axially arranged as a hollow structure and is sleeved at one end of the insulator of the post insulator 1210. The first sealing plate 12112 seals the end of the flange cylinder 12111 away from the post insulator 1210. A plurality of first connection holes are provided on the first sealing plate 12112 for connecting the post connecting fitting 1230. The post connecting fitting 1230 includes a second sealing plate 1231 and a first insertion plate (not shown in the figure). The shape and size of the second sealing plate 1231 are the same as those of the first sealing plate 12112. A plurality of second connection holes corresponding to the plurality of first connection holes are provided on the second sealing plate 1231. The first sealing plate 12112 and the second sealing plate 1231 are fixedly connected by passing fasteners through the corresponding first connection holes and second connection holes. The first insertion plate is vertically arranged on the plate surface of the second sealing plate 1231 away from the post insulator 1210. A plurality of third connection holes are provided on the first insertion plate, and a plurality of fourth connection holes corresponding to the plurality of third connection holes are provided on the two clamping plates 131. When the first insertion plate is inserted between the two clamping plates 131, fasteners are passed through the corresponding third connection holes and fourth connection holes, so that the post connecting fitting 1230 is fixedly connected to the joint fitting 130, and the post insulator 1210 can be fixedly connected to the joint fitting 130.

[0050] In other embodiments, when the number of post insulators is at least two, multiple post insulators can be first connected to the post connecting fittings of other structures and then fixedly connected to the joint fittings through the post connecting fittings, which will not be elaborated here.

[0051] The connecting fitting connected to the stay insulator 1220 is the stay connecting fitting 1240, that is, the joint fitting 130 is detachably and fixedly connected to the other end of the stay insulator 1220 through the stay connecting fitting 1240. The stay insulator 1220 includes an insulator and end fittings sleeved at both ends of the insulator. The end fitting at the other end of the stay insulator 1220 has two connecting lugs 1221 arranged relatively parallel. The two connecting lugs 1221 are spaced apart to leave a certain gap therebetween. A fifth connecting hole is provided on the connecting lug 1221 for connecting the stay connecting fitting 1240. The stay connecting fitting 1240 is a plate-shaped member. A sixth connecting hole corresponding to the fifth connecting hole is provided at one end of the stay connecting fitting 1240. The stay connecting fitting 1240 is inserted into the gap between the two connecting lugs 1221, and the fixed connection between the end fitting of the stay insulator 1220 and the stay connecting fitting 1240 is realized by passing a fastener through the corresponding fifth connecting hole and sixth connecting hole. A seventh connecting hole is provided at the other end of the stay connecting fitting 1240. Eighth connecting holes corresponding to the seventh connecting hole are provided on the two clamping plates 131. When the stay connecting fitting 1240 is inserted between the two clamping plates 131, a fastener is passed through the corresponding seventh connecting hole and eighth connecting hole to fixedly connect the stay connecting fitting 1240 to the joint fitting 130, and thus the stay insulator 1220 can be fixedly connected to the joint fitting 130.

[0052] In other embodiments, when the number of stay insulators is at least two, a connecting member can be provided. One end of the connecting member is fixedly connected to the joint fitting, and the other end is fixedly connected to a plurality of stay insulators. Details are not described herein again.

[0053] A third construction hole is further provided at the bottom of the clamping plate 131. The third construction hole is spaced apart from the wire hanging hole and is used for construction or maintenance. The joint fitting 130 of the present application has a simple structure, is convenient for processing, has a clear force transmission path, and a simple stress form.

[0054] In this application, the post insulator 1210 and the stay insulator 1220 are respectively detachably fixedly connected to the post connecting fitting 1230 and the stay connecting fitting 1240. Then, the post connecting fitting 1230 and the stay connecting fitting 1240 are inserted between the two clamping plates 131 of the joint fitting 130. Such a setting enables, when it is necessary to disassemble the post insulator 1210 and the stay insulator 1220, the connection between the post connecting fitting 1230 and the stay connecting fitting 1240 and the joint fitting 130 to be maintained, and only the fasteners between the post insulator 1210 and the post connecting fitting 1230 and the fasteners between the stay insulator 1220 and the stay connecting fitting 1240 need to be removed. This is convenient for disassembling the post insulator 1210 and the stay insulator 1220, and at the same time, the overall structure stability of the joint fitting 130 can be maintained. The fasteners used in this application can adopt the common bolt-nut cooperation fixing structure or other existing technologies as long as the fastening connection can be achieved. For the convenience of clearly showing the component structure, each fastener is not shown in the figure.

[0055] In one embodiment, in order to replace the post insulator 1210, the load-bearing device 140 in step S11 is set as the first load-bearing device 141. Before step S11, two first load-bearing devices 141 are prepared; step S11 is executed, and the first load-bearing device 141 is lifted by the hoisting mechanism until the first load-bearing device 141 reaches a preset working position close to the tower body 110 and convenient for installation; step S12 is executed, and the two first load-bearing devices 141 are installed between the tower body 110 and the joint fitting 130, and the two first load-bearing devices 141 are respectively symmetrically arranged on both sides of the post insulator 1210. The two first load-bearing devices 141 are symmetric about the central axis plane of the post insulator 1210. The two first load-bearing devices 141 and the tower body 110 form an isosceles triangle structure, and the post insulator 1210 is located on the midline of the base of the isosceles triangle. At this time, the loads borne by the two first load-bearing devices 141 are equal, so that the forces in all directions of the joint fitting 130 can be balanced, and the stability of the entire connection structure is improved.

[0056] Before step S12, two first construction holes (not shown in the figure) are provided on the tower body 110. The two first construction holes are symmetrically located on both sides of the connection between the post insulator 1210 and the tower body 110. One end of the first load-bearing device 141 is fixedly connected to the tower body 110 through the first construction hole, and the other end is fixedly connected to the joint fitting 130. Of course, one, three or more first construction holes can also be provided on the tower body 110, which specifically corresponds to the number of the first load-bearing devices 141 and is convenient for connecting the first load-bearing device 141 and the tower body 110.

[0057] In this embodiment, a second construction hole is provided on the fixing plate 132 of the node fitting 130 for connecting the first load-bearing device 141. In other embodiments, the first load-bearing device can also be connected by providing a second construction hole on other components of the node fitting.

[0058] Combined with Figure 4 , the first load-bearing device 141 includes a first adjusting member 1411, a first load-bearing member 1412, and a first connecting member 1413 that are connected in sequence, and the first adjusting member 1411, the first load-bearing member 1412, and the first connecting member 1413 are coaxially arranged. The first adjusting member 1411 includes an outer cavity 14111 and an inner cavity 14112 that are sleeved with each other. Both the outer cavity 14111 and the inner cavity 14112 are columnar structures. The outer cavity 14111 is a hollow columnar structure, and the inner cavity 14112 is located in the hollow inner cavity of the outer cavity 14111, and the outer cavity 14111 and the inner cavity 14112 are coaxially arranged. The relative positions of the outer cavity 14111 and the inner cavity 14112 along their axial directions are adjustable, specifically referring to that the inner cavity 14112 can extend out or retract into the outer cavity 14111, so that the overall length of the first adjusting member 1411 can be adjusted. Furthermore, the overall length of the first load-bearing device 141 can be adjusted through the first adjusting member 1411, making the first load-bearing device 141 applicable to replacing post insulators 1210 of various length specifications. The first adjusting member 1411 further includes a first driving member and a first transmission member that are respectively connected to the outer cavity 14111 and the inner cavity 14112. The first driving member drives the first transmission member to move by means of hydraulic transmission or screw transmission, and the first transmission member drives the inner cavity 14112 to move along the axial direction of the outer cavity 14111. Among them, it can be that the outer cavity 14111 is arranged close to the first load-bearing member 1412 and the inner cavity 14112 is arranged away from the first load-bearing member 1412, or the inner cavity 14112 is arranged close to the first load-bearing member 1412 and the outer cavity 14111 is arranged away from the first load-bearing member 1412, which is not limited here.

[0059] Both ends of the first adjusting member 1411 are provided with first flange plates 14113. Among them, the first flange plate 14113 of the first adjusting member 1411 away from the first load-bearing member 1412 is used for fixedly connecting with the tower body 110. A number of first mounting holes are provided on the first flange plate 14113 away from the first load-bearing member 1412. The number of first mounting holes corresponds to a number of first construction holes provided on the tower body 110. Fasteners are sequentially passed through the corresponding first mounting holes and first construction holes, and then the first load-bearing device 141 is fixedly connected with the tower body 110. The first flange plate 14113 of the first adjusting member 1411 close to the first load-bearing member 1412 is used for connecting with the first load-bearing member 1412. In step S13, the first adjusting member 1411 adjusts its own length by extending its inner cavity 14112 out of the outer cavity 14111, so as to adjust the length of the first load-bearing device 141, and further realize the overall tensioning of the connection structure between the first load-bearing device 141 and the joint fitting 130, so that the load borne by the post insulator 1210 is transferred to the first load-bearing device 141, and then the post insulator 1210 can be relaxed, which is convenient for disassembling and replacing the post insulator 1210. In a specific embodiment, the first adjusting member 1411 can adopt a screw jack, which is convenient to use and easy to operate; in other embodiments, the first adjusting member can also be other tooling equipment, such as a hydraulic jack, as long as the length can be adjusted, and it is not limited here.

[0060] The first load-bearing member 1412 is a pipe structure. At one end of the first load-bearing member 1412 away from the joint fitting 130, a second flange 14121 is provided for fixedly connecting with the first flange 14113 provided at the end of the first adjusting member 1411 close to the first load-bearing member 1412. By setting the first load-bearing member 1412 and the first adjusting member 1411 to be detachably connected, the first load-bearing member 1412 with different lengths can be replaced according to the actual required length during operation, so as to adapt to the post insulators 1210 with different length specifications, enhancing the applicability of the first load-bearing device 141. A number of flange through-holes are correspondingly provided on the first flange 14113 of the first adjusting member 1411 close to the first load-bearing member 1412 and on the second flange 14121. Before step S11, fasteners are sequentially passed through the corresponding flange through-holes to fixedly connect the first load-bearing member 1412 and the first adjusting member 1411. Since the first load-bearing member 1412 needs to bear the load transferred from the post insulator 1210 in step S13, the first load-bearing member 1412 needs to be made of a material with sufficient hardness, and alloy steel can be used. In other embodiments, the first load-bearing member can also be made of metal materials of other materials, such as cast aluminum alloy, etc.; the first load-bearing member can also be made of fiberglass material. Fiberglass has a large elastic modulus, good mechanical properties, and is not easily brittle after being stressed. It can not only ensure the safety and reliability of the support, but also facilitate the construction personnel to carry out construction in the live state. In short, the material of the first load-bearing member only needs to have sufficient hardness to bear the corresponding load, and no limitation is made here.

[0061] In this embodiment, the first load-bearing member 1412 is a hollow pipe, and the cross-section of the first load-bearing member 1412 is circular, which is convenient for processing and connection. In other embodiments, according to different working conditions, the first load-bearing member can also be a solid rod, and the cross-section can be other shapes such as rectangular, as long as it is convenient for connection and meets the connection strength, and no limitation is made here.

[0062] The first connecting member 1413 includes two second insertion plates 14131 arranged at intervals. The two second insertion plates 14131 are arranged at the end of the first load-bearing member 1412 away from the first adjusting member 1411, and the plate surfaces of the two second insertion plates 14131 are parallel to each other. Second mounting holes are provided on the second insertion plates 14131, and the two second insertion plates 14131 are clamped on both side plate surfaces of the fixing plate 132. In step S12, by passing fasteners through the second mounting holes and the second construction holes, the mutual connection between the first load-bearing device 141 and the joint fitting 130 is realized. The connection between the first connecting member 1413 and the first load-bearing member 1412 can be fixed by welding or can also be integrally formed.

[0063] In other embodiments, the first connecting member may also be composed of other numbers of second insertion plates, which may be one, three, four or more. The second insertion plates may be arranged at intervals along the circumferential direction of the first load-bearing member and connected to the first load-bearing member for fixedly connecting to the joint fitting. The specific number of the second insertion plates may be determined according to the actual shape of the joint fitting.

[0064] Combined with Figure 5 , in another embodiment, the first connecting member 1413 is separately provided from the first load-bearing member 1412 and fixedly connected by fasteners. The first connecting member 1413 includes a second insertion plate 14131, a first support member 14132, and a third flange 14133 that are connected in sequence. The first support member 14132 is coaxially arranged with the first load-bearing member 1412. Second flanges 14121 are provided at both ends of the first load-bearing member 1412. The end of the first load-bearing member 1412 away from the joint fitting 130 is fixedly connected to the first flange 14113 provided at the end of the first adjusting member 1411 close to the first load-bearing member 1412 through the second flange 14121. The end of the first load-bearing member 1412 close to the joint fitting 130 is fixedly connected to the third flange 14133 on the first connecting member 1413 through the second flange 14121. In this way, both the connection between the first connecting member 1413 and the first load-bearing member 1412 and the connection between the first load-bearing member 1412 and the first adjusting member 1411 are detachable connections. Different lengths of the first load-bearing member 1412 can be replaced according to the actual length required during operation, so as to adapt to post insulators 1210 of different length specifications, enhancing the applicability of the first load-bearing device 141. At the same time, only different lengths of the first load-bearing member 1412 need to be prepared in advance for replacement, without replacing the first connecting member 1413 and the first adjusting member 1411, and the cost of spare parts is lower.

[0065] A number of flange through holes are correspondingly provided on the second flange 14121 of the first load-bearing member 1412 close to the joint fitting 130 and on the third flange 14133. Before step S11, fasteners are sequentially passed through the corresponding flange through holes to fixedly connect the first load-bearing member 1412 to the first connecting member 1413 and fixedly connect the first load-bearing member 1412 to the first adjusting member 1411. The outer diameter of the first load-bearing member 1412 is larger than the outer diameter of the first support member 14132. In this way, when the first connecting member 1413 is fixedly connected to the joint fitting 130, due to the smaller outer diameter of the first support member 14132, interference with the joint fitting 130 can be effectively avoided, so that it can be applicable to connecting joint fittings 130 of different shapes.

[0066] In an application scenario, the first connecting member 1413 includes two second inserting plates 14131 that are perpendicularly connected to each other. One of the second inserting plates 14131 is vertically disposed on the end face of the first support member 14132 close to the joint fitting 130 and is used for fixedly connecting to the fixing plate 132 on the joint fitting 130. Then, a second mounting hole is provided on this second inserting plate 14131. In step S12, the first load-bearing device 141 and the joint fitting 130 are connected to each other by passing a fastener through the second mounting hole and the corresponding second construction hole on the fixing plate 132. The other second inserting plate 14131 is perpendicular to the plate surface of the above-mentioned second inserting plate 14131 and the end face of the first support member 14132 close to the joint fitting 130 at the same time, and the side edge of this other second inserting plate 14131 abuts against the plate surface of the above-mentioned second inserting plate 14131 and extends to the outer peripheral surface of the first support member 14132, which can enhance the mechanical strength of the first connecting member 1413, and further improve the connection strength between the first connecting member 1413 and the joint fitting 130.

[0067] Of course, in other application scenarios, the first connecting member 1413 can also adopt other structures, as long as the connection between the first load-bearing device 141 and the joint fitting 130 can be achieved and the connection strength can be ensured, which is not limited herein.

[0068] Before step S11, first determine the length of the post insulator 1210 to be replaced, and determine the length of the first load-bearing device 141 required according to the length of the post insulator 1210 to be replaced. Select the length of the corresponding first load-bearing member 1412 according to this length, and select the first connecting member 1413 that matches the joint fitting 130. On the ground, first connect the first load-bearing member 1412 with the first adjusting member 1411 and the first connecting member 1413, that is, connect one end of the first adjusting member 1411 to one end of the first load-bearing member 1412, and connect the other end of the first load-bearing member 1412 to one end of the first connecting member 1413, thereby completing the assembly of the first load-bearing device 141. In step S12, install the other end of the first adjusting member 1411 on the tower body 110, and connect the other end of the first connecting member 1413 to the high-voltage end of the composite cross arm, specifically connect it to the joint fitting 130, thereby completing the installation of the first load-bearing device 141. It can be understood that post insulators with different length specifications can also be applicable to the same specification of the first load-bearing device, as long as the position of the first construction hole on the tower body is adjusted, that is, as long as the distance between the first construction hole on the tower body and the second construction hole on the joint fitting matches the length of the first load-bearing device. In this way, the applicability of the first load-bearing device can be expanded.

[0069] Since the length of the first load-bearing device 141 is adjustable, the initial length of the first load-bearing device 141 can be set according to the actual working conditions. As long as the first load-bearing device 141 can adapt to the post insulator 1210, the two ends of the first load-bearing device 141 can be conveniently installed on the tower body 110 and the joint fitting 130. After the installation of the first load-bearing device 141 is completed, the length of the first load-bearing device 141 is adjusted again so that the length of the first load-bearing device 141 is slightly greater than the length between the first construction hole and the second construction hole, that is, the two ends of the first load-bearing device 141 can support the tower body 110 and the joint fitting 130, thereby increasing the distance between the tower body 110 and the joint fitting 130. The post insulator 1210 is relaxed accordingly, and the load on the post insulator 1210 is transferred to the first load-bearing device 141, so that the post insulator 1210 can be disassembled and replaced.

[0070] In another embodiment, referring to Figure 6 , in order to replace the stay insulator 1220, the load-bearing device 140 in step S11 is set as the second load-bearing device 142. Before step S11, two second load-bearing devices 142 are prepared; step S11 is executed, and the second load-bearing device 142 is lifted by the hoisting mechanism until the second load-bearing device 142 reaches a preset working position close to the tower body 110 and convenient for installation; step S12 is executed, and the two second load-bearing devices 142 are installed between the tower body 110 and the joint fitting 130, and the two second load-bearing devices 142 are symmetrically arranged on both sides of the stay insulator 1220 respectively. The two second load-bearing devices 142 are symmetric about the central axis plane of the stay insulator 1220. The two second load-bearing devices 142 and the tower body 110 form an isosceles triangle structure, and the stay insulator 1220 is located on the median line of the base of the isosceles triangle. At this time, the loads on the two second load-bearing devices 142 are equal, so that the forces on the joint fitting 130 in all directions can be balanced, and the stability of the entire connection structure is improved.

[0071] Before step S12, two first construction holes (not shown in the figure) are provided on the tower body 110. The two first construction holes are symmetrically located on both sides of the connection between the stay insulator 1220 and the tower body 110. One end of the second load-bearing device 142 is fixedly connected to the tower body 110 through the first construction hole, and the other end is fixedly connected to the joint fitting 130. Of course, one, three or more first construction holes can also be provided on the tower body 110, specifically corresponding to the number of the second load-bearing devices 142 and being convenient for connecting the second load-bearing device 142 and the tower body 110.

[0072] In this embodiment, a second construction hole is provided on the auxiliary connecting member 134 of the joint fitting 130 for connecting the second load-bearing device 142. In other embodiments, the second load-bearing device can also be connected by providing second construction holes on other components of the joint fitting.

[0073] The second load-bearing device 142 includes a second adjusting member 1421 connected to each other 、 a second load-bearing member 1422 and a second connecting member 1423, and the second adjusting member 1421, the second load-bearing member 1422 and the second connecting member 1423 are coaxially arranged. The second adjusting member 1421 includes a guy wire member, a second driving member, and a second transmission member. The guy wire member is connected to the second transmission member and the second load-bearing member 1422. The second driving member drives the second transmission member to move, and the two cooperate with each other to shorten or elongate the guy wire member, so that the overall length of the second adjusting member 1421 can be adjusted according to requirements. Furthermore, the overall length of the second load-bearing device 142 can be adjusted through the second adjusting member 1421, so that the second load-bearing device 142 is applicable to replacing stay insulators 1220 of various length specifications.

[0074] The second adjusting member 1421 is connected to the second load-bearing member 1422 through a guy wire member. In step S13, by tensioning the guy wire member, the length of the second adjusting member 1421 is shortened, that is, the length of the second load-bearing device 142 is shortened, so that the connection structure between the second load-bearing device 142 and the joint fitting 130 is tightened as a whole, so that the load on the stay insulator 1220 is transferred to the second load-bearing device 142, and then the stay insulator 1220 can be relaxed, which is convenient for disassembling and replacing the stay insulator 1220. In a specific embodiment, the second adjusting member 1421 can adopt a hand winch, which is convenient to use and easy to operate. In other embodiments, the second adjusting member can also be other tooling equipment, such as an electric hoist or a winch, as long as the length can be adjusted, and no limitation is made here.

[0075] The second load-bearing member 1422 includes a first connecting rope. The length of the first connecting rope corresponds to the length of the stay insulator 1220 and is connected to the second adjusting member 1421. One end of the first connecting rope is connected to the joint fitting 130, and the other end is connected to one end of the second adjusting member 1421 through a guy wire member. The other end of the second adjusting member 1421 is directly connected to the tower body 110. In other embodiments, the second adjusting member may further include a second connecting rope. One end of the first connecting rope is connected to the joint fitting, and the other end is connected to one end of the second adjusting member through a guy wire member. The other end of the second adjusting member is connected to the tower body through the second connecting rope. By providing the first connecting rope and the second connecting rope, first connecting ropes and second connecting ropes of different lengths can be replaced according to the actual required length during operation, so as to adapt to stay insulators 1220 of different length specifications, enhancing the applicability of the second load-bearing device 142. The lengths of the first connecting rope and the second connecting rope correspond to the length of the stay insulator 1220 and are convenient for connecting the joint fitting 130 and the tower body 110, and are not limited herein. Before step S11, the second load-bearing member 1422 is fixedly connected to the second adjusting member 1421 through a guy wire member. Since in step S13, the second load-bearing member 1422 needs to bear the load transferred from the stay insulator 1220, the second load-bearing member 1422 needs to ensure a certain connection strength and can be made of steel wire rope. In other embodiments, the second load-bearing member may also be made of insulating rope to facilitate construction by construction personnel in a live state. Of course, the second load-bearing member may also be made of other materials, as long as the connection strength is satisfied, and is not limited herein.

[0076] Combined with Figure 3 and Figure 6 , a second mounting hole is provided on the second connecting member 1423. In step S12, the second load-bearing device 142 is connected to the joint fitting 130 by passing a fastener through the second mounting hole and the corresponding second construction hole on the auxiliary connecting member 134. In the present embodiment, the second connecting member 1423 is a U-shaped hanging ring. In other embodiments, the second connecting member may also be other connecting fittings such as a right-angle hanging plate, as long as the connection between the second load-bearing device and the joint fitting can be achieved and the connection strength is ensured, and is not limited herein.

[0077] Before step S11, first determine the length of the stay insulator 1220 to be replaced, and determine the length of the second load-bearing device 142 required according to the length of the stay insulator 1220 to be replaced. Select the length of the corresponding second load-bearing member 1422 according to this length. On the ground, first connect the second load-bearing member 1422 with the second adjusting member 1421 and the second connecting member 1423, that is, connect one end of the second adjusting member 1421 with one end of the second load-bearing member 1422, and connect the other end of the second load-bearing member 1422 with one end of the second connecting member 1423, thereby completing the assembly of the second load-bearing device 142. In step S12, install the other end of the second adjusting member 1421 on the tower body 110, and connect the other end of the second connecting member 1423 with the joint fitting 130, thereby completing the installation of the second load-bearing device 142. It can be understood that stay insulators of different length specifications can also be applicable to the second load-bearing device of the same specification, as long as the position of the first construction hole on the tower body is adjusted, that is, as long as the distance between the first construction hole on the tower body and the second construction hole on the joint fitting matches the length of the second load-bearing device. In this way, the applicability of the second load-bearing device can be expanded.

[0078] Since the length of the second load-bearing device 142 is adjustable, the initial length of the second load-bearing device 142 can be set according to the actual working conditions. As long as the second load-bearing device 142 can be adapted to the stay insulator 1220, the two ends of the second load-bearing device 142 can be conveniently installed on the tower body 110 and the joint fitting 130. After the second load-bearing device 142 is installed, adjust the length of the second load-bearing device 142 again to make the length of the second load-bearing device 142 slightly less than the length between the first construction hole and the second construction hole, that is, the two ends of the second load-bearing device 142 can tighten the tower body 110 and the joint fitting 130, then the distance between the tower body 110 and the joint fitting 130 is reduced, the stay insulator 1220 is relaxed accordingly, and the load borne by the stay insulator 1220 is transferred to the second load-bearing device 142, so that the stay insulator 1220 can be disassembled and replaced.

[0079] The beneficial effects of the present application: The joint fitting of the present application is composed of two parallel clamping plates, and there is a certain gap between the two clamping plates. Compared with the joint fitting composed of a single flat plate with the same total thickness, the section modulus of the joint fitting of the present application around the neutral axis is larger, with higher bending moment resistance, and can extend the service life of the joint fitting.

[0080] Meanwhile, the post insulators and stay insulators are detachably and fixedly connected to the joint fittings through connecting fittings. During operation and maintenance, each cross-arm insulator can be replaced individually without separating the conductors hung on the transmission tower, which is simple, safe, highly efficient as a whole, simplifies the operation and maintenance process, and reduces the personal safety risk of operation and maintenance personnel. The joint fittings are provided with second construction holes for connecting the load-bearing device, and the load-bearing device is convenient to install and can greatly reduce the complexity of construction.

[0081] 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 described in the foregoing embodiments, or perform equivalent replacements for 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 two clamping plates arranged in parallel with each other, and fixing plates are respectively connected to the two outer plate surfaces of the two clamping plates facing away from each other.

2. The transmission tower according to claim 1, wherein, Construction holes are arranged on the fixing plates.

3. The transmission tower according to claim 1, characterized in that, Auxiliary connecting pieces are installed on the fixing plates, and construction holes are arranged on the auxiliary connecting pieces.

4. The transmission tower according to claim 3, wherein, The auxiliary connecting piece is a T-shaped plate, and the auxiliary connecting piece is detachably connected to the fixing plate.

5. The transmission tower according to claim 1, characterized in that, Reinforcing ribs are arranged between the outer plate surfaces of the clamping plates and the two plate surfaces of the fixing plates facing away from each other.

6. The transmission tower according to claim 1, characterized in that, The cross arm insulator includes a post insulator and a stay insulator. One end of the post insulator and one end of the stay insulator are both detachably connected to the tower body, and the stay insulator is located above the post insulator on the tower body. The other end of the post insulator and the other end of the stay insulator are detachably fixedly connected to the joint fittings.

7. The transmission tower according to claim 6, wherein, The other end of the post insulator and the other end of the stay insulator are inserted between the two clamping plates through connecting fittings and fixed by fasteners.

8. The transmission tower according to claim 7, characterized in that An end fitting is arranged at the other end of the post insulator. The end fitting includes: A flange cylinder, which is arranged as a hollow structure along the axial direction; A first sealing plate, which seals the end of the flange cylinder away from the post insulator. A plurality of first connection holes are arranged on the first sealing plate.

9. The transmission tower according to claim 8, characterized in that, The connecting fitting connected to the post insulator is a post connecting fitting. The post connecting fitting includes a second sealing plate and a first insertion plate. A plurality of second connection holes corresponding to the plurality of first connection holes are arranged on the second sealing plate. The first insertion plate is vertically arranged on the plate surface of the second sealing plate away from the post insulator.

10. The transmission tower according to claim 7, characterized in that, The connecting fitting connected to the stay insulator is a stay connecting fitting. An end fitting is arranged at the other end of the stay insulator. The end fitting has two connecting lugs arranged relatively parallel to each other. Fifth connection holes are arranged on the connecting lugs for connecting the stay connecting fitting.

Images