Load-bearing device and operation and maintenance method for power transmission tower

Abstract

Provided in the present application is a load-bearing device for replacement of cross-arm insulators mounted on a power transmission tower. The load-bearing device comprises an adjusting member, a load-bearing member and a connecting member which are connected in sequence, wherein a first end of the adjusting member is configured to connect to a tower body of the power transmission tower, and a second end is fixedly connected to a first end of the load-bearing member; a second end of the load-bearing member is fixedly connected to the connecting member; and the adjusting member is used for adjusting the length of the load-bearing device. The load-bearing device has a simple structure, is convenient to operate, and enables removal and replacement of cross-arm insulators of different specifications by selecting load-bearing members of different models, thus achieving wide applicability. Further provided in the present application is an operation and maintenance method for a power transmission tower.

Description

Force bearing device and power transmission tower operation and maintenance method TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, in particular to a force bearing device and a power transmission tower operation and maintenance method. BACKGROUND

[0002] Current operation and maintenance of composite cross arms often requires the entire composite cross arm to be removed after the wires are separated and lifted, the entire composite cross arm is transported to the ground for replacement of cross arm insulators, and then the composite cross arm is hoisted and assembled in the air. The overall procedure is complicated, the construction difficulty is great, and the cost is high. SUMMARY

[0003] To solve the above problems, the technical scheme adopted by the present application is to provide a force bearing device for replacing cross arm insulators installed on a power transmission tower. The force bearing device comprises a adjusting member, a force bearing member and a connecting member connected in sequence. The first end of the adjusting member is used to connect with the tower body of the power transmission tower, and the second end is fixedly connected with the first end of the force bearing member. The second end of the force bearing member is fixedly connected with the connecting member. The adjusting member is used to adjust the length of the force bearing device.

[0004] In an embodiment, the adjusting member comprises an outer cavity and an inner cavity. The inner cavity is a solid or hollow columnar structure, and the outer cavity is a hollow columnar structure. The inner cavity is located in the hollow cavity of the outer cavity, and the outer cavity and the inner cavity are coaxially arranged in the axial direction of the adjusting member. The relative position of the outer cavity and the inner cavity along the axial direction of the adjusting member is adjustable.

[0005] In an embodiment, the adjusting member further comprises a first driving member and a first transmission member connected with the outer cavity and the inner cavity respectively. The first driving member drives the first transmission member to move, and the first transmission member drives the inner cavity to move along the axial direction of the outer cavity.

[0006] In an embodiment, the second end of the adjusting member is provided with a first flange plate, and the first end of the force bearing member is provided with a second flange plate. The first flange plate and the second flange plate are correspondingly matched and connected to fixedly connect the adjusting member and the force bearing member.

[0007] In an embodiment, the connecting member comprises a second plug plate. The number of the second plug plates is two. The two second plug plates are arranged parallel to each other, or the two second plug plates are arranged perpendicular to each other.

[0008] In an embodiment, the first end of the adjusting member is connected with the tower body through a hinge member, so that the force bearing device can rotate relative to the tower body.

[0009] In an embodiment, the adjusting member comprises a tension member, a second driving member and a second transmission member. The first end of the tension member is connected with the second transmission member, and the second end is connected with the force bearing member. The length of the tension member is adjustable, and the second driving member drives the second transmission member to move. In an embodiment, the adjusting member comprises a tension member, a second driving member and a second transmission member. The first end of the tension member is connected with the second transmission member, and the second end is connected with the force bearing member. The length of the tension member is adjustable, and the second driving member drives the second transmission member to move.

[0010] The application also provides a power transmission tower operation and maintenance method, which can simplify the operation and maintenance process and improve the operation and maintenance efficiency. The power transmission tower includes a tower body and a composite cross arm arranged on the tower body. 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 is used for hanging a conductor. The composite cross arm includes at least one cross arm insulator. The first end of the cross arm insulator is detachably connected to the tower body, and the second end of the cross arm insulator is detachably connected to the high-voltage end of the composite cross arm. The power transmission tower operation and maintenance method is used for replacing the cross arm insulator. The force bearing device is used, and the method includes the following steps: S11: hoisting the force bearing device to a preset working position; S12: installing the force bearing device, connecting the first end of the force bearing device to the tower body, and connecting the second end of the force bearing device to the high-voltage end of the composite cross arm; S13: adjusting the length of the force bearing device to loosen the cross arm insulator to be replaced, and removing the cross arm insulator to be replaced; S14: installing a new cross arm insulator; and S15: removing the force bearing device.

[0011] In an embodiment, the force bearing device is assembled before step S11. In step S12, the force bearing device is connected to the high-voltage end of the composite cross arm through the connecting piece and connected to the tower body through the adjusting piece. In step S13, the length of the force bearing device is adjusted through the adjusting piece.

[0012] In an embodiment, the composite cross arm further includes a node fitting. The cross arm insulator is detachably connected to the node fitting and the tower body. The cross arm insulator includes one support insulator and one cable-stayed insulator. The first end of the support insulator and the first end of the cable-stayed insulator are connected to the tower body. The second end of the support insulator and the second end of the cable-stayed insulator are connected through the node fitting. In step S12, the second end of the force bearing device is connected to the node fitting.

[0013] In an embodiment, the node fitting includes two clamping plates arranged in parallel with each other. Two outer plates of the two clamping plates are respectively connected with fixing plates. The support insulator and the cable-stayed insulator are respectively inserted between the two clamping plates through the connecting fitting. The clamping plate is provided with a wire hanging hole for hanging the conductor.

[0014] In an embodiment, two force bearing devices are prepared before step S11. In step S12, the two force bearing devices are arranged on the two sides of the cross arm insulator respectively. The two force bearing devices are symmetrical about the axis of the cross arm insulator.

[0015] In an embodiment, the composite cross arm further includes a node fitting. The cross arm insulator is detachably connected to the node fitting and the tower body. The cross arm insulator includes two support insulators and two cable-stayed insulators. The first end of the two support insulators and the first end of the two cable-stayed insulators are connected to the tower body. The second end of the two support insulators and the second end of the two cable-stayed insulators are connected through the node fitting. In step S12, the second end of the force bearing device is connected to the node fitting. In an embodiment, the composite cross arm further includes a node fitting. The cross arm insulator is detachably connected to the node fitting and the tower body. The cross arm insulator includes two support insulators and two cable-stayed insulators. The first end of the two support insulators and the first end of the two cable-stayed insulators are connected to the tower body. The second end of the two support insulators and the second end of the two cable-stayed insulators are connected through the node fitting. In step S12, the second end of the force bearing device is connected to the node fitting.

[0016] In an embodiment, the node fitting comprises a first strain connecting fitting, a second strain connecting fitting, and two wire hanging pieces, the first strain connecting fitting comprises two first flange sleeves and two first connecting flange plates covering the two first flange sleeves respectively, the two wire hanging pieces are connected to opposite ends of the second strain connecting fitting respectively, the first strain connecting fitting is connected to the second strain connecting fitting through the wire hanging pieces arranged close to the tower body, the post insulator is connected to the first strain connecting fitting, the cable-stayed insulator is connected to the first strain connecting fitting or the second strain connecting fitting, and the wire hanging piece is used for hanging the conductor.

[0017] In an embodiment, the node fitting comprises a first connecting plate, two second connecting plates, and a shielding ring, the first connecting plate comprises a first surface and a second surface arranged oppositely, the first connecting plate is used for connecting the second end of the post insulator, the two second connecting plates are arranged on the first surface in a spaced manner and connected to the first surface in a side surface, the second connecting plate is used for connecting the second end of the cable-stayed insulator, and the shielding ring is installed on the first surface.

[0018] In an embodiment, before step S11, at least one force bearing device is prepared, and in step S12, the at least one force bearing device is arranged in the middle of the two post insulators or in the middle of the two cable-stayed insulators, so that the two post insulators or the two cable-stayed insulators are symmetrical about the force bearing device.

[0019] In an embodiment, before step S12, a construction hole is arranged on the tower body, and in step S12, the force bearing device is connected to the tower body through the construction hole.

[0020] The beneficial effects of the present application are as follows: Different from the prior art, the force bearing device of the present application can be used for replacing the cross arm insulator, different structures of the force bearing device are provided for the post insulator and the cable-stayed insulator, the structure is simple, the operation is convenient, and by selecting different types of force bearing pieces, the removal and replacement of cross arm insulators of different specifications can be realized, and the applicability is wide.

[0021] Meanwhile, the operation and maintenance method of the power transmission tower of the present application uses the force bearing device to remove and replace a single cross arm insulator, without the need to separate or remove the conductor originally hung on the cross arm insulator, that is, without the need to temporarily suspend the conductor or remove the entire composite cross arm, so that the operation and maintenance steps can be simplified to the greatest extent, the operation and maintenance efficiency is improved, and the cost is saved.

[0022] In addition, the operation and maintenance method of the power transmission tower of the present application uses the node fitting arranged at the high-voltage end of the composite cross arm to connect the force bearing device, the force bearing device is convenient to install, the complexity of construction can be greatly reduced, and the force bearing device can be applied to various types of composite cross arms. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in

[0024] Fig. 1 is a flowchart of an embodiment of the power transmission tower operation and maintenance method of the present application;

[0025] Fig. 2 is a schematic diagram of the original structure of a power transmission tower before operation and maintenance;

[0026] Fig. 3 is a schematic diagram of the structure of a power transmission tower connected with a force bearing device according to an embodiment of the present application;

[0027] Fig. 4 is an enlarged schematic diagram of A in Fig. 3;

[0028] Fig. 5 is a schematic diagram of the force bearing device in an application scenario;

[0029] Fig. 6 is a schematic diagram of the force bearing device in another application scenario;

[0030] Fig. 7 is a schematic diagram of the structure of another embodiment of a power transmission tower connected with a force bearing device according to an embodiment of the present application;

[0031] Fig. 8 is a schematic diagram of the structure of a power transmission tower connected with a force bearing device according to another embodiment of the present application;

[0032] Fig. 9 is a schematic diagram of the structure of another embodiment of a power transmission tower connected with a force bearing device according to another embodiment of the present application;

[0033] Fig. 10 is a schematic diagram of the structure of a power transmission tower connected with a force bearing device according to yet another embodiment of the present application;

[0034] Fig. 11 is a schematic diagram of the structure of another embodiment of a power transmission tower connected with a force bearing device according to yet another embodiment of the present application;

[0035] Fig. 12 is an enlarged schematic diagram of the connection between the force bearing device and the node fitting according to another embodiment of the present application;

[0036] Fig. 13 is an enlarged schematic diagram of B in Fig. 10;

[0037] Fig. 14 is an enlarged schematic diagram of C in Fig. 13;

[0038] Fig. 15 is an enlarged schematic diagram of the node fitting according to yet another embodiment of the present application;

[0039] Fig. 16 is a partial enlarged schematic diagram of the force bearing device in Fig. 6. DETAILED DESCRIPTION

[0040] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0041] Unless otherwise explicitly specified or limited, the "connection" described in the present application should be understood in a broad sense, which can be direct connection or connection through an intermediate medium. In the description of the present application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end" and the like is the orientation or position relationship shown based on the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0042] The power transmission tower operation and maintenance method of the present application is used for replacing cross arm insulators. The power transmission tower includes a tower body and a composite cross arm arranged on the tower body. 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 is used for hanging a conductor. The composite cross arm includes at least one cross arm insulator. The first end of the cross arm insulator is detachably connected to the tower body, and the second end of the cross arm insulator is detachably connected to the high-voltage end of the composite cross arm. The cross arm insulator can include only a post insulator, or can include a post insulator and a stay insulator. The specific number and combination structure are determined according to the actual working conditions.

[0043] In an embodiment, in combination with FIGS. 1 to 3, FIG. 1 is a flowchart of the operation and maintenance method of the present application, and FIGS. 2 and 3 are structural schematic diagrams of the power transmission tower 10 before and during operation and maintenance, respectively. Since the tower body before and during operation and maintenance does not change, the tower body before and during operation and maintenance is denoted by the same reference numeral.

[0044] The power transmission tower 10 includes a tower body 110 and a composite cross arm arranged on the tower body 110. 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 is used for hanging a conductor 101. The composite cross arm includes a cross arm insulator 120. The first end of the cross arm insulator 120 is detachably connected to the tower body 110, and the second end of the cross arm insulator 120 is detachably connected to the high-voltage end of the composite cross arm.

[0045] The operation and maintenance method of the power transmission tower 10 includes:

[0046] S11: hoist the length-adjustable load-bearing device 140 to a preset working position.

[0047] The load-bearing device 140 is hoisted by the hoisting mechanism until the load-bearing device 140 reaches the preset working position close to the tower body 110 and convenient for installation.

[0048] The lifting mechanism can be a crane or other commonly used lifting device. The crane moves the load bearing device 140 to the position near the cross arm insulator 120 to be replaced on the power transmission tower 10 by moving the winch, wire rope sleeve and other tools, and then prepares to install the load bearing device 140.

[0049] Before lifting, the appearance of the relevant equipment and tools should be checked to ensure that there is no deformation, crack, damage, etc. The selected equipment and tools must be regularly inspected.

[0050] S12: Install the load bearing device 140, connect the first end of the load bearing device 140 to the tower body 110, and connect the second end to the high-voltage end of the composite cross arm.

[0051] 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, the first end of the load bearing device 140 is provided with a first installation hole corresponding to the first construction hole, and the second end of the load bearing device 140 is provided with a second installation hole corresponding to the second construction hole, so as to facilitate the connection of the two ends of the load bearing device 140 with the tower body 110 and the high-voltage end of the composite cross arm, and make the load bearing device 140 located between the tower body 110 and the high-voltage end of the composite cross arm.

[0052] First, connect the second end of the load bearing device 140 to the high-voltage end of the composite cross arm, and then connect the first end of the load bearing device 140 to the tower body 110. Since the length of the load bearing device 140 is adjustable, the initial length of the load bearing device 140 can be set arbitrarily before installation. When the second installation hole of the second end of the load bearing device 140 corresponds to the second construction hole of the high-voltage end of the composite cross arm, connect and fix it by fasteners, then adjust the length of the load bearing device 140, so that the first installation hole of the first end of the load bearing device 140 corresponds to the first construction hole of the tower body 110, and then connect and fix it by fasteners, which completes the installation of the load bearing device 140.

[0053] 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, the first end of the adjusting member is provided with a first installation hole for connecting with the tower body 110, the second end of the adjusting member is fixedly connected with the first end of the load bearing member, the second end of the load bearing member is fixedly connected with the first end of the connecting member, and the second end of the connecting member is provided with a second installation hole for connecting with the high-voltage end of the composite cross arm.

[0054] The tower body 110 is a common lattice iron tower in the art, and only part of its structure is shown in the drawings, which will not be described here.

[0055] S13: Adjust the length of the load bearing device 140 to loosen the cross arm insulator 120 to be replaced, and remove the cross arm insulator 120 to be replaced.

[0056] The length of the force bearing device 140 can be adjusted by the adjusting member. When the force bearing device 140 is installed, the length of the force bearing device 140 is adjusted to loosen the cross arm insulator 120, i.e. the load on the cross arm insulator 120 is transferred to the force bearing device 140, and then the fasteners such as bolts and nuts on the cross arm insulator 120 are removed, and then the cross arm insulator 120 to be replaced is removed.

[0057] S14: Install a new cross arm insulator 120.

[0058] After the cross arm insulator 120 to be replaced is removed, the position of the force bearing device 140 is kept unchanged, and the new cross arm insulator 120 is installed until the new cross arm insulator 120 is stable.

[0059] S15: Remove the force bearing device 140.

[0060] The length of the force bearing device 140 is adjusted to transfer the load on the force bearing device 140 to the new cross arm insulator 120 again, and when the force bearing device 140 is not under load, the fasteners connected to the ends of the force bearing device 140 are removed to disconnect the force bearing device 140 from the power transmission tower 10, and the replacement of the cross arm insulator 120 is completed.

[0061] The above operation and maintenance method can replace the cross arm insulator 120 under live line, and the construction personnel need to wear shielding clothes to perform equipotential operation, and the entire operation and maintenance process needs to use tools made of insulating materials, including the force bearing device 140 used. The cross arm insulator 120 can also be replaced under de-energized, and before step S11, step S01 of de-energizing the power transmission tower 10 is further included. That is, it is ensured that the power transmission tower 10 is de-energized to ensure the safety of the operation and maintenance process. The above operation and maintenance method can replace each cross arm insulator 120 connected to the high-voltage end of the composite cross arm in a detachable manner individually, without the need to separate the conductor 101 hung on the power transmission tower 10, or to temporarily hang the conductor 101 by using a ground wire support or an upper-phase composite cross arm, etc. In this way, the conductor 101 is protected and the unnecessary structure design is omitted, the overall structure of the power transmission tower 10 is optimized, the operation is simple and safe, the operation and maintenance steps are simplified, the operation and maintenance efficiency is improved, the cost is saved, and the personal safety risk of the operation and maintenance personnel is reduced.

[0062] In an application scenario, in combination with FIGS. 2-5, the composite cross arm includes a cross arm insulator 120 and a node fitting 130, the low-voltage end of the composite cross arm is connected to the tower body 110, the high-voltage end of the composite cross arm is hung with the conductor 101 through the node fitting 130, and the cross arm insulator 120 is detachably connected with the node fitting 130 and the tower body 110. The cross arm insulator 120 includes a strut insulator 1210 and a cable-stayed insulator 1220, the first end of the strut insulator 1210 and the first end of the cable-stayed insulator 1220 are both detachably connected with the tower body 110, and the cable-stayed insulator 1220 is located above the strut insulator 1210 on the tower body 110, and the second end of the strut insulator 1210 and the second end of the cable-stayed insulator 1220 are detachably connected with the node fitting 130.

[0063] The node fitting 130 includes two clamping plates 131 arranged in parallel with each other, the second end of the strut insulator 1210 and the second end of the cable-stayed insulator 1220 are both provided with a connecting fitting, the strut insulator 1210 and the cable-stayed insulator 1220 are respectively inserted between the two clamping plates 131 through the connecting fitting and fixed through a fastener, so that the strut insulator 1210 and the cable-stayed insulator 1220 are both detachably connected with the node fitting 130, the bottom of the clamping plate 131 is provided with a wire hanging hole, and a wire hanging fitting is arranged in the wire hanging hole through a fastener, for hanging the conductor 101. The node fitting 130 is provided with a second construction hole, for connecting the force bearing device 140.

[0064] The clamping plate 131 is a plate-shaped member, the clamping plate 131 can be a rectangular plate-shaped member, a circular plate-shaped member or other special-shaped plate-shaped member, the two clamping plates 131 are arranged in parallel, and a certain gap is left between the two clamping plates 131 for clamping the connecting fitting. In the present application, the clamping plate 131 is a special-shaped plate-shaped member, specifically a polygonal plate-shaped member, which is convenient for connecting with other components.

[0065] In an embodiment, the plate surface of any one clamping plate 131 away from the other clamping plate 131 is defined as the outer plate surface of the clamping plate 131, the two outer plate surfaces of the two clamping plates 131 are respectively connected with a first fixing plate 132, the first fixing plate 132 is perpendicular to the outer plate surface of the clamping plate 131, and the first fixing plate 132 is provided with a second construction hole, for connecting the force bearing device 140.

[0066] In another embodiment, referring to FIG. 4, an auxiliary connecting piece 134 can also be mounted on the first fixing plate 132, and the detachable connection between the first fixing plate 132 and the auxiliary connecting piece 134 can be achieved by providing corresponding through holes on the first fixing plate 132 and the auxiliary connecting piece 134 and threading fasteners in the through holes, so that the auxiliary connecting piece 134 can be detached and reused. The auxiliary connecting piece 134 is a T-shaped plate, and a second construction hole is provided on the auxiliary connecting piece 134 for connecting the force bearing device 140. By providing the auxiliary connecting piece 134, interference between the force bearing device 140 and the node fitting 130 or the cross arm insulator 120 when the force bearing device 140 is directly mounted to the first fixing plate 132 can be avoided, thereby facilitating the installation of the force bearing device 140.

[0067] In other embodiments, a second construction hole can also be provided on other components of the node fitting for connecting the force bearing device, which is not limited herein.

[0068] Referring to FIG. 4, reinforcing ribs 133 are provided between the outer plate surface of the clamping plate 131 and the two plate surfaces of the first fixing plate 132 to further increase the connection strength between the first fixing plate 132 and the clamping plate 131, so that when the force bearing device 140 is mounted on the node fitting 130, the phenomenon of the force bearing device 140 falling off due to the breakage of the first fixing plate 132 does not occur, further eliminating safety hazards.

[0069] The connecting fitting connected with the post insulator 1210 is a post connecting fitting 1230. The post insulator 1210 includes an insulator and end fittings sleeved on both ends of the insulator, and the end fitting at the second end of the post insulator 1210 includes a flange barrel 12111 and a first sealing plate 12112. The flange barrel 12111 is provided in a hollow structure along the axial direction and is sleeved on one end of the insulator. The first sealing plate 12112 covers the end of the flange barrel 12111 away from the post insulator 1210, and a plurality of first connecting 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), and the first insertion plate is vertically provided on the plate surface of the second sealing plate 1231 away from the post insulator 1210. The shape and size of the second sealing plate 1231 are consistent with those of the first sealing plate 12112, and a plurality of second connecting holes corresponding to the plurality of first connecting holes are provided on the second sealing plate 1231. The connection between the first sealing plate 12112 and the second sealing plate 1231 can be achieved by threading fasteners in the corresponding first connecting holes and second connecting holes, so that the post connecting fitting 1230 can be connected with the post insulator 1210. A plurality of third connecting holes are provided on the first insertion plate, and a plurality of fourth connecting holes corresponding to the plurality of third connecting holes are provided on the two clamping plates 131. When the first insertion plate is inserted between the two clamping plates 131, the post connecting fitting 1230 can be connected with the node fitting 130 by threading fasteners in the corresponding third connecting holes and fourth connecting holes.

[0070] The connecting hardware connected with the stay insulator 1220 is a stay connecting hardware 1240. The stay insulator 1220 comprises an insulator and end hardware sleeved on both ends of the insulator, and the end hardware at the second end of the stay insulator 1220 comprises two connecting lugs 1221 arranged in parallel and spaced apart to leave a certain gap therebetween, and the connecting lugs 1221 are provided with a fifth connecting hole. The stay connecting hardware 1240 is a plate-shaped piece, the first end of the stay connecting hardware 1240 is provided with a sixth connecting hole corresponding to the fifth connecting hole, the first end of the stay connecting hardware 1240 is inserted into the gap between the two connecting lugs 1221, and a fastener is threaded in the corresponding fifth connecting hole and sixth connecting hole to realize the connection of the stay insulator 1220 and the stay connecting hardware 1240, and the second end of the stay connecting hardware 1240 is provided with a seventh connecting hole, and the two clamping plates 131 are provided with an eighth connecting hole corresponding to the seventh connecting hole, when the second end of the stay connecting hardware 1240 is inserted between the two clamping plates 131, a fastener is threaded in the corresponding seventh connecting hole and eighth connecting hole to connect the stay connecting hardware 1240 with the node hardware 130.

[0071] The above arrangement makes it possible to maintain the connection of the stay connecting hardware 1230 or the stay connecting hardware 1240 with the node hardware 130 when the stay insulator 1210 or the stay insulator 1220 needs to be disassembled, and only the fasteners between the stay insulator 1210 and the stay connecting hardware 1230 or the fasteners between the stay insulator 1220 and the stay connecting hardware 1240 need to be removed, which facilitates the disassembly of the stay insulator 1210 or the stay insulator 1220 while maintaining the stability of the overall structure of the node hardware 130.

[0072] In other embodiments, when the node hardware of the composite cross arm is of other structures, the stay insulator and the stay insulator can also be directly connected to the node hardware without the connecting hardware, i.e., the end hardware at the second end of the stay insulator is directly connected to the node hardware through a fastener, and the end hardware at the second end of the stay insulator is directly connected to the node hardware through a fastener, which will not be described in detail.

[0073] The fasteners used in the present application can adopt common bolt and nut structures or other existing technologies as long as they can realize fastening connection. For the purpose of clearly showing the structures of the components, each fastener is not shown in the figures.

[0074] In an 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 performed, the first load bearing device 141 is hoisted by the hoisting mechanism until the first load bearing device 141 reaches the preset working position. Before step S12, two first construction holes (not shown in the figure) are set 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. Of course, one, three or more first construction holes can also be set on the tower body 110, which specifically corresponds to the number of the first load bearing device 141 and is convenient for connecting the first load bearing device 141 and the tower body 110. Step S12 is performed, the two first load bearing devices 141 are installed between the tower body 110 and the node fitting 130. The first end of the first load bearing device 141 is connected to the tower body 110 through the first construction hole, the second end is connected to the node fitting 130 through the second construction hole on the first fixing plate 132, and the two first load bearing devices 141 are symmetrically arranged on both sides of the post insulator 1210, the two first load bearing devices 141 are symmetric about the axis of the post insulator 1210, the two first load bearing devices 141 form an isosceles triangle structure with the tower body 110, and the post insulator 1210 is located on the midline of the base of the isosceles triangle, at this time the load on the two first load bearing devices 141 is equal, which can balance the stress of the node fitting 130 in all directions, and improves the stability of the whole connection structure.

[0075] In combination with FIG. 5, the first force bearing device 141 comprises a first adjusting member 1411, a first force bearing member 1412 and a first connecting member 1413 connected in sequence, and the first adjusting member 1411, the first force bearing member 1412 and the first connecting member 1413 are coaxially arranged. The first adjusting member 1411 comprises an outer cavity 14111 and an inner cavity 14112, both of which are columnar structures. The inner cavity 14112 is a solid or hollow columnar structure, and the outer cavity 14111 is a hollow columnar structure. 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 in the axial direction of the first adjusting member 1411, that is, the axis of the outer cavity 14111, the inner cavity 14112 and the first adjusting member 1411 are in the same straight line. The relative position of the outer cavity 14111 and the inner cavity 14112 along the axial direction of the first adjusting member 1411 is adjustable, specifically, the inner cavity 14112 can be extended or retracted from the outer cavity 14111, so that the overall length of the first adjusting member 1411 is adjustable, and the overall length of the first force bearing device 141 is adjustable through the first adjusting member 1411, so that the first force bearing device 141 is suitable for replacing a variety of length specifications of the support insulator 1210. The first adjusting member 1411 further comprises a first driving member and a first transmission member connected with the outer cavity 14111 and the inner cavity 14112 respectively. The first driving member drives the first transmission member to move through 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. The outer cavity 14111 can be arranged close to the first force bearing member 1412, and the inner cavity 14112 can be arranged away from the first force bearing member 1412, or the inner cavity 14112 can be arranged close to the first force bearing member 1412, and the outer cavity 14111 can be arranged away from the first force bearing member 1412, which is not limited herein.

[0076] In an embodiment, the first end of the first adjusting member 1411 is provided with a tower flange 14114 for direct connection with the tower body 110. The tower flange 14114 is provided with a plurality of first mounting holes corresponding to a plurality of first construction holes provided on the tower body 110. The fasteners are sequentially inserted through the corresponding first mounting holes and first construction holes, and then the first force bearing device 141 is connected with the tower body 110. The tower flange 14114 has a simple structure, which can facilitate the installation and fixation of the first force bearing device 141 on the tower body 110, and at the same time ensure the connection strength between the first force bearing device 141 and the tower body 110.

[0077] In another embodiment, the tower flange plate 14114 is connected to the end face of the tower body 110 via a third plug-in plate 14134. The first end of the first adjusting member 1411 is connected to the tower body 110 via a hinge member 14115, so that the first force bearing device 141 is rotatable relative to the tower body 110. The hinge member 14115 includes a hinge shaft and a hinge plate connected to each other, the hinge shaft is rotatably arranged on the tower body 110, and the hinge plate is connected to the first end of the first adjusting member 1411, specifically connected to the first adjusting member 1411 via the third plug-in plate 14134. The hinge member 14115 can make the first force bearing device 141 rotatable in the horizontal direction relative to the tower body 110. Compared with the direct connection of the tower flange plate 14114 to the tower body 110, the hinge member 14115 can simplify the matching design required for the installation of the first force bearing device 141 on the tower body 110, for example, reduce the number of first construction holes, and make the connection structure simple and convenient for the installation of the first force bearing device 141.

[0078] The second end of the first adjusting member 1411 is provided with a first flange plate 14113 for connecting with the first force bearing member 1412. In step S13, the length of the first force bearing device 141 is adjusted by the first adjusting member 1411. The first adjusting member 1411 extends out of the outer cavity 14111 through the inner cavity 14112 to realize the overall tensioning of the connection structure of the first force bearing device 141 and the node fitting 130, so that the load on the tower insulator 1210 is transferred to the first force bearing device 141, and then the tower insulator 1210 can be loosened, facilitating the disassembly and replacement of the tower insulator 1210. In specific embodiments, the first adjusting member 1411 can be 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, for example, a hydraulic jack, as long as it can realize the adjustable length, which is not limited here.

[0079] The first force bearing piece 1412 is a pipe structure, and a second flange plate 14121 is arranged at the first end of the first force bearing piece 1412, which is used for corresponding matching connection with the first flange plate 14113 arranged at the second end of the first adjusting piece 1411. Specifically, the first flange plate 14113 arranged at the second end of the first adjusting piece 1411 and the second flange plate 14121 arranged at the first end of the first force bearing piece 1412 are detachably connected through fasteners. Different lengths of the first force bearing piece 1412 can be replaced according to the actual length required during operation, so as to adapt to the support insulator 1210 of different length specifications, and the applicability of the first force bearing device 141 is improved. A plurality of flange plate through holes are arranged on the first flange plate 14113 arranged at the second end of the first adjusting piece 1411 and the second flange plate 14121 arranged at the first end of the first force bearing piece 1412. Before step S11, the fasteners are sequentially inserted through the corresponding flange plate through holes to fixedly connect the first force bearing piece 1412 and the first adjusting piece 1411. Since the first force bearing piece 1412 needs to bear the load transferred by the support insulator 1210, the first force bearing piece 1412 needs to be made of a material with sufficient hardness, and can be made of alloy steel. In other embodiments, the first force bearing piece can also be made of other metal materials, such as cast aluminum alloy; the first force bearing piece can also be made of a composite material, such as a glass fiber reinforced material, which has a large elastic modulus, good mechanical properties, and is not easy to break after being stressed. The first force bearing piece can ensure safety and reliability of support, and can also facilitate construction personnel to perform construction under a live condition, that is, the material of the first force bearing piece only needs to have sufficient hardness to bear the corresponding load, which is not limited here.

[0080] In the embodiment, the first force bearing piece 1412 is a hollow pipe, and the cross section of the first force bearing piece 1412 is circular, which is convenient for processing and connection. In other embodiments, according to different working conditions, the first force bearing piece can also be a solid rod, and the cross section can be rectangular or other shapes, as long as it is convenient for connection and meets the connection strength, which is not limited here.

[0081] The first connecting piece 1413 includes a second plug plate 14131, and the number of the second plug plate 14131 is two. In an application scenario, the two second plug plates 14131 are arranged in parallel, that is, the two second plug plates 14131 are arranged at intervals and the plate surfaces are parallel to each other. The two second plug plates 14131 are arranged on the end face of the second end of the first force bearing piece 1412. Each second plug plate 14131 is provided with a second mounting hole, and the first fixed plate 132 is clamped between the two second plug plates 14131.

[0082] In another application scenario, as shown in FIG. 5, two second inserting plates 14131 are arranged perpendicularly to each other. One of the second inserting plates 14131 is arranged perpendicularly on the end face of the second end of the first force bearing member 1412, and is used to connect with the first fixing plate 132 on the node fitting 130. The second inserting plate 14131 is provided with a second mounting hole. The other second inserting plate 14131 is arranged perpendicularly to the plate face of the above-mentioned second inserting plate 14131 and the end face of the second end of the first force bearing member 1412. The side edge of the other second inserting plate 14131 abuts against the plate face of the above-mentioned second inserting plate 14131 and extends to the outer circumferential face of the first force bearing member 1412, thereby strengthening the mechanical strength of the first connecting member 1413 and improving the connecting strength between the first connecting member 1413 and the node fitting 130.

[0083] In step S12, the first force bearing device 141 is connected with the node fitting 130 by inserting fasteners in the second mounting hole and the second construction hole. The connection between the first connecting member 1413 and the first force bearing member 1412 can be fixed by welding or can be formed integrally. In other embodiments, the first connecting member can also be composed of other numbers of second inserting plates, which can be one, three, four or more. The second inserting plates can be arranged at intervals along the circumference of the first force bearing member and connected with the first force bearing member, and are used to be fixedly connected with the node fitting. The specific number of the second inserting plates can be determined according to the actual shape of the node fitting, or the first connecting member can adopt other structures as long as it can realize the connection between the first force bearing device and the node fitting and ensure the connecting strength. Therefore, the first connecting member is not limited herein.

[0084] In another embodiment, the first connecting piece 1413 is arranged separately from the first force bearing piece 1412 and is fixedly connected by fasteners. The first connecting piece 1413 comprises a second insertion plate 14131, a support piece 14132 and a third flange plate 14133 connected in sequence, and the support piece 14132 is coaxially arranged with the first force bearing piece 1412. The first force bearing piece 1412 is provided with a second flange plate 14121 at both ends, the first end of the first force bearing piece 1412 is fixedly connected with the first flange plate 14113 arranged at the second end of the first adjusting piece 1411 through the second flange plate 14121, and the second end of the first force bearing piece 1412 is fixedly connected with the third flange plate 14133 of the first end of the first connecting piece 1413 through the second flange plate 14121, so that the first connecting piece 1413 and the first force bearing piece 1412, and the first force bearing piece 1412 and the first adjusting piece 1411 are all detachably connected, and different lengths of the first force bearing piece 1412 can be replaced according to the actual length required during operation, so as to adapt to the support insulator 1210 of different length specifications, improve the applicability of the first force bearing device 141, and only need to prepare different lengths of the first force bearing piece 1412 for replacement, without the need to replace the first connecting piece 1413 and the first adjusting piece 1411, and the cost of spare parts is lower. The second flange plate 14121 of the second end of the first force bearing piece 1412 and the third flange plate 14133 of the first end of the first connecting piece 1413 are correspondingly provided with a plurality of flange plate through holes, and before step S11, the fasteners are sequentially inserted through the corresponding flange plate through holes to fixedly connect the first force bearing piece 1412 with the first connecting piece 1413 and fixedly connect the first force bearing piece 1412 with the first adjusting piece 1411. The outer diameter of the first force bearing piece 1412 is larger than the outer diameter of the support piece 14132, so that when the first connecting piece 1413 is connected with the node fitting 130, the support piece 14132 can effectively avoid interference with the node fitting 130 due to the smaller outer diameter, so as to be applicable to connection with node fittings 130 of different shapes.

[0085] Before step S11, the first force bearing device 141 is assembled. First, the length of the support insulator 1210 to be replaced is determined, and then the length of the first force bearing device 141 to be used is determined, and the length of the corresponding first force bearing piece 1412 is determined according to the length, and the first connecting piece 1413 matched with the node fitting 130 is selected. The first force bearing piece 1412 is connected with the first adjusting piece 1411 and the first connecting piece 1413 on the ground, that is, the second end of the first adjusting piece 1411 is connected with the first end of the first force bearing piece 1412, and the second end of the first force bearing piece 1412 is connected with the first end of the first connecting piece 1413, so as to complete the assembly of the first force bearing device 141. In step S12, the first force bearing device 141 is connected to the high-voltage end of the composite cross arm through the first connecting piece 1413, and the first force bearing device 141 is connected to the tower body 110 through the first adjusting piece 1411. The first end of the first adjusting piece 1411 is installed on the tower body 110, and the second end of the first connecting piece 1413 is connected with the high-voltage end of the composite cross arm, specifically connected with the node fitting 130, so as to complete the installation of the first force bearing device 141. The support insulator of different length specifications can also use the same specification of the first force bearing device, as long as the position of the first construction hole on the tower body is adjusted, and the applicability of the first force bearing device can be expanded.

[0086] Since the length of the first force bearing device 141 is adjustable, the initial length of the first force bearing device 141 can be set according to the actual working condition, as long as the first force bearing device 141 can adapt to the support insulator 1210, and then the two ends of the first force bearing device 141 can be conveniently installed on the tower body 110 and the node fitting 130. When the first force bearing device 141 is installed, the length of the first force bearing device 141 is adjusted again, so that the length of the first force bearing device 141 is slightly larger than the length between the first construction hole and the second construction hole, that is, the two ends of the first force bearing device 141 can support the tower body 110 and the node fitting 130, so that the distance between the tower body 110 and the node fitting 130 is increased, the support insulator 1210 is relaxed, and the load on the support insulator 1210 is transferred to the first force bearing device 141, so that the support insulator 1210 can be disassembled and replaced.

[0087] In another embodiment, referring to FIG. 7, in order to replace the cable-stayed 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 performed to hoist the second load bearing device 142 by the hoisting mechanism until the second load bearing device 142 reaches the preset working position. Before step S12, two first construction holes (not shown in the figure) are set on the tower body 110, the two first construction holes are symmetrically located on both sides of the connection between the cable-stayed insulator 1220 and the tower body 110, the first end of the second load bearing device 142 is connected to the tower body 110 through the first construction hole, and the second end is connected to the node fitting 130 through the second construction hole set on the auxiliary connecting piece 134. Of course, one, three or more first construction holes can also be set on the tower body 110, which specifically corresponds to the number of second load bearing devices 142 and facilitates the connection between the second load bearing device 142 and the tower body 110. Step S12 is performed to install the two second load bearing devices 142 between the tower body 110 and the node fitting 130, and the two second load bearing devices 142 are symmetrically arranged on both sides of the cable-stayed insulator 1220, respectively. The two second load bearing devices 142 are symmetric about the axis of the cable-stayed insulator 1220, the two second load bearing devices 142 form an isosceles triangle structure with the tower body 110, and the cable-stayed insulator 1220 is located on the midline of the base of the isosceles triangle. At this time, the load on the two second load bearing devices 142 is equal, which can balance the stress of the node fitting 130 in all directions and improve the stability of the entire connection structure.

[0088] The second load bearing device 142 comprises a second adjusting piece 1421, a second load bearing piece 1422 and a second connecting piece 1423 connected in sequence. The second adjusting piece 1421 comprises a pulling piece, a second driving piece and a second transmission piece, the first end of the pulling piece is connected with the second transmission piece, the second end is connected with the second load bearing piece 1422, and the length of the pulling piece is adjustable. The second driving piece drives the second transmission piece to move, and the two are matched with each other to shorten or lengthen the pulling piece, so that the overall length of the second adjusting piece 1421 is adjustable according to the demand, and then the overall length of the second load bearing device 142 is adjusted through the second adjusting piece 1421, so that the second load bearing device 142 is suitable for replacing cable-stayed insulators 1220 of various length specifications.

[0089] The second adjusting member 1421 is connected with the second force bearing member 1422 through a pull wire. In step S13, the length of the second force bearing device 142 is adjusted by the second adjusting member 1421. By tensioning the pull wire, the length of the second adjusting member 1421 is shortened, i.e. the length of the second force bearing device 142 is shortened, so that the whole second force bearing device 142 is tensioned together with the connecting structure of the node fitting 130, thereby the load on the cable-stayed insulator 1220 is transferred to the second force bearing device 142, and then the cable-stayed insulator 1220 can be loosened, facilitating the dismounting and replacing of the cable-stayed insulator 1220. In a specific embodiment, the second adjusting member 1421 can be a hand-operated hoist, which is convenient to use and easy to operate. The hand-operated hoist comprises a first hook, a second hook, a steel wire rope, a transmission mechanism and a handle. The transmission mechanism comprises a gear set and a ratchet pawl. In this case, the steel wire rope is the pull wire, the handle is the second driving member, and the transmission mechanism is the second transmission member. The first end of the steel wire rope is connected with the transmission mechanism, and the second end is connected with the second force bearing member 1422 through the second hook. The length of the steel wire rope is adjustable. The first end of the hand-operated hoist is fixedly connected with the tower body 110 through the first hook, and the second end is fixedly connected with the second force bearing member 1422 through the steel wire rope and the second hook. The handle is pulled to drive the gear to rotate, so that the steel wire rope is shortened or lengthened. In other embodiments, the second adjusting member can also be other tooling equipment, such as an electric hoist or a winch, as long as it can adjust the length, which is not limited here.

[0090] The second force bearing member 1422 comprises a first connecting rope. The first end of the first connecting rope is connected with the second end of the second adjusting member 1421 through a pull wire, and the second end is connected with the node fitting 130 through a second connecting member 1423. The first end of the second adjusting member 1421 is directly connected with the tower body 110. In other embodiments, the second adjusting member can also comprise a second connecting rope. The first end of the first connecting rope is connected with the second end of the second adjusting member through a pull wire, and the first end of the second adjusting member is connected with the tower body through the second connecting rope. By arranging the first connecting rope and the second connecting rope, different lengths of the first connecting rope and the second connecting rope can be replaced according to the actual length required during operation, so as to adapt to cable-stayed insulators 1220 of different length specifications, thereby improving the applicability of the second force bearing device 142. Before step S11, the second force bearing member 1422 is fixedly connected with the second adjusting member 1421 through a pull wire. Since the second force bearing member 1422 needs to bear the load transferred from the cable-stayed insulator 1220, the second force bearing member 1422 needs to ensure a certain connection strength, which can be made of a steel wire rope. In other embodiments, the second force bearing member can also be made of an insulating rope to facilitate the construction personnel to work under the live condition. Of course, the second force bearing member can also be made of other materials, as long as it meets the connection strength, which is not limited here.

[0091] In combination with FIG. 4 and FIG. 7, the second mounting hole is arranged on the second connecting piece 1423, and in step S12, the fastener is threaded through the second mounting hole and the corresponding second construction hole of the auxiliary connecting piece 134 to realize the connection between the second force bearing device 142 and the node fitting 130. In the embodiment, the second connecting piece 1423 is a U-shaped hanging ring, and in other embodiments, the second connecting piece can also be a right-angle hanging plate or other connecting fittings, as long as the connection between the second force bearing device and the node fitting can be realized and the connection strength is ensured, which is not limited herein.

[0092] Before step S11, the second force bearing device 142 is assembled. First, the length of the cable-stayed insulator 1220 to be replaced is determined, and then the length of the second force bearing device 142 to be used is determined, and the length of the corresponding second force bearing piece 1422 is determined according to the length. The second force bearing piece 1422 is connected with the second adjusting piece 1421 and the second connecting piece 1423 on the ground, that is, the second end of the second adjusting piece 1421 is connected with the first end of the second force bearing piece 1422, and the second end of the second force bearing piece 1422 is connected with the first end of the second connecting piece 1423, thereby completing the assembly of the second force bearing device 142. In step S12, the second force bearing device 142 is connected to the high-voltage end of the composite cross arm through the second connecting piece 1423, and connected to the tower body 110 through the second adjusting piece 1421. The first end of the second adjusting piece 1421 is installed on the tower body 110, and the second end of the second connecting piece 1423 is connected with the node fitting 130, thereby completing the installation of the second force bearing device 142. The second force bearing device of the same specification can be applied to the cable-stayed insulator of different length specifications, as long as the position of the first construction hole on the tower body is adjusted, which can improve the applicability of the second force bearing device.

[0093] Since the length of the second force bearing device 142 is adjustable, the initial length of the second force bearing device 142 can be set according to the actual working condition, as long as the second force bearing device 142 can adapt to the cable-stayed insulator 1220, the two ends of the second force bearing device 142 can be conveniently installed on the tower body 110 and the node fitting 130. When the installation of the second force bearing device 142 is completed, the length of the second force bearing device 142 is adjusted again, so that the length of the second force bearing device 142 is slightly smaller than the length between the first construction hole and the second construction hole, that is, the two ends of the second force bearing device 142 can pull the tower body 110 and the node fitting 130, thereby reducing the distance between the tower body 110 and the node fitting 130, and the cable-stayed insulator 1220 is loosened, and the load on the cable-stayed insulator 1220 is transferred to the second force bearing device 142, so that the cable-stayed insulator 1220 can be disassembled and replaced.

[0094] In another application scenario, in combination with FIG. 8 and FIG. 12, the power transmission tower 20 includes a tower body 210 and a composite cross arm provided on the tower body 210, the composite cross arm includes a cross arm insulator 220 and a node fitting 230, a low-voltage end of the composite cross arm is connected to the tower body 210, a high-voltage end of the composite cross arm is hung with the conductor 201 through the node fitting 230, the cross arm insulator 220 includes two support insulators 2210 and two cable-stayed insulators 2220, first ends of the two support insulators 2210 and first ends of the two cable-stayed insulators 2220 are detachably connected to the tower body 210, and the cable-stayed insulators 2220 are located above the support insulators 2210 on the tower body 210, second ends of the two support insulators 2210 and second ends of the two cable-stayed insulators 2220 are detachably connected to the node fitting 230, and the two support insulators 2210 form a V-shaped structure with the node fitting 230 as the vertex, and the two cable-stayed insulators 2220 form a V-shaped structure with the node fitting 230 as the vertex.

[0095] The node fitting 230 includes a first connecting plate 231, two second connecting plates 232, and a shielding ring 233, the first connecting plate 231 includes a first surface and a second surface arranged opposite to each other, the two second connecting plates 232 are arranged on the first surface of the first connecting plate 231 and connected to the first surface in side surface, and the shielding ring 233 is installed on the first surface. The second ends of the support insulators 2210 and the second ends of the cable-stayed insulators 2220 are provided with end fittings, the end fittings are provided with connecting holes, the first connecting plate 231 is provided with first through holes corresponding to the connecting holes of the end fittings of the support insulators 2210, the two second connecting plates 232 are respectively provided with second through holes corresponding to the connecting holes of the end fittings of the cable-stayed insulators 2220, and the second ends of the two support insulators 2210 are connected to the first connecting plate 231 and the second ends of the two cable-stayed insulators 2220 are respectively connected to the two second connecting plates 232 through fasteners. The shielding ring 233 is in a semi-enclosing structure and is arranged at the periphery of the first connecting plate 231. The second surface of the first connecting plate 231 is provided with a wire hanging plate 235, the wire hanging plate 235 is provided with a wire hanging hole at the bottom, a wire hanging fitting is arranged in the wire hanging hole through a fastener, and the wire hanging fitting is used for hanging the conductor 201. When the support insulators 2210 and the cable-stayed insulators 2220 need to be detached, only the fasteners between the end fittings and the node fitting 230 need to be removed, which can facilitate detachment and can maintain the stability of the overall structure of the node fitting 230.

[0096] The node fitting 230 further comprises a third connecting plate 234, which is installed on the first surface of the first connecting plate 231 and connected with the two second connecting plates 232 on the side. The third connecting plate 234 is connected with the first connecting plate 231 and the two second connecting plates 232 at the same time, which can increase the connecting strength of the node fitting 130. In addition, some through holes can be arranged on the third connecting plate 234 for construction or maintenance. In other embodiments, the third connecting plate can also be selected not to be arranged, as long as the connecting strength can be met, which is not limited here.

[0097] In an embodiment, the first connecting plate 231 of the node fitting 230 is provided with a second construction hole for connecting the force bearing device 140.

[0098] In another embodiment, a second fixing plate 236 can also be installed between the two second connecting plates 232 to set the second construction hole. The second fixing plate 236 is arranged on the first surface of the first connecting plate 231 and connected with the first surface on the side. The force bearing device 140 is connected with the second fixing plate 236 through the second construction hole, which can avoid the interference between the force bearing device 140 and the node fitting 230 or the cross arm insulator 220 when the force bearing device 140 is directly installed on the first connecting plate 231, and improves the convenience of installation. In other embodiments, the force bearing device can also be connected by arranging the second construction hole on other components of the node fitting, which is not limited here.

[0099] In an embodiment, in order to replace the support insulator 2210, the force bearing device 140 in step S11 is set as a first force bearing device 141. Before step S11, a first force bearing device 141 is prepared; step S11 is performed, and the first force bearing device 141 is hoisted by the hoisting mechanism until the first force bearing device 141 reaches the preset working position. Before step S12, a first construction hole (not shown in the figure) is arranged on the tower body 210. The first construction hole is located at the middle position of the connection between the two support insulators 2210 and the tower body 210. The first end of the first force bearing device 141 is connected to the tower body 210 through the first construction hole, and the second end is connected to the node fitting 230 through the second construction hole arranged on the first connecting plate 231. Step S12 is performed, and the first force bearing device 141 is installed between the tower body 210 and the node fitting 230, and the first force bearing device 141 is located in the middle of the two support insulators 2210, so that the two support insulators 2210 are symmetrical about the first force bearing device 141. The two support insulators 2210 and the tower body 210 form an isosceles triangle structure, and the first force bearing device 141 is located on the middle line of the base of the isosceles triangle, so that the stress of the node fitting 230 in each direction can be balanced, and the stability of the whole connecting structure is improved.

[0100] The structure of the first force bearing device 141 is consistent with the foregoing, and the process of disassembling and replacing the post insulator 2210 by using the first force bearing device 141 is also consistent with the process of the post insulator 1210, which will not be described here.

[0101] In another embodiment, referring to FIG. 9, in order to replace the diagonal insulator 2220, the force bearing device 140 in step S11 is set as a second force bearing device 142. Before step S11, a second force bearing device 142 is prepared; step S11 is performed to hoist the second force bearing device 142 by using the hoisting mechanism until the second force bearing device 142 reaches the preset working position. Before step S12, a first construction hole (not shown in the figure) is arranged on the tower body 210, the first construction hole is located at a middle position between the two diagonal insulators 2220 and the tower body 210, the first end of the second force bearing device 142 is connected to the tower body 210 through the first construction hole, and the second end is connected to the node fitting 230 through a second construction hole arranged on the second fixing plate 236. Step S12 is performed to install the second force bearing device 142 between the tower body 210 and the node fitting 230, and the second force bearing device 142 is located in the middle of the two diagonal insulators 2220, so that the two diagonal insulators 2220 are symmetric about the second force bearing device 142. The two diagonal insulators 2220 and the tower body 210 form an isosceles triangle structure, and the second force bearing device 142 is located on the middle line of the base of the isosceles triangle, so that the stress of the node fitting 230 in each direction can be balanced, and the stability of the entire connecting structure is improved.

[0102] The structure of the second force bearing device 142 is consistent with the foregoing, and the process of disassembling and replacing the diagonal insulator 2220 by using the second force bearing device 142 is also consistent with the process of the diagonal insulator 1220, which will not be described here.

[0103] In another application scenario, referring to FIGS. 10 and 13, the power transmission tower 30 includes a tower body 310 and a composite cross arm arranged on the tower body 310, the composite cross arm includes cross arm insulators 320 and a node fitting 330, a low-voltage end of the composite cross arm is connected to the tower body 310, a high-voltage end of the composite cross arm is hung with a conductor through the node fitting 330, the structure of the cross arm insulator 320 is the same as that of the cross arm insulator 220, and both include two post insulators 3210 and two diagonal insulators 3220, which will not be described in detail, and the difference lies in the structure of the node fitting 330.

[0104] The node fitting 330 comprises a first strain connecting fitting 331, a second strain connecting fitting 332, and two wire hanging fittings 333, the two wire hanging fittings 333 are respectively connected to opposite ends of the second strain connecting fitting 332, and the length of the second strain connecting fitting 332 can be adjusted according to the required spacing between the two wire hanging fittings 333. The first strain connecting fitting 331 is connected to the second strain connecting fitting 332 through one of the wire hanging fittings 333, and the two wire hanging fittings 333 are both used for hanging the conductors. The two wire hanging fittings 333 are integrated into one node fitting 330, which can reduce the layer spacing of the composite cross arm, compress the overall size of the tower head of the power transmission tower 30, improve the electromagnetic environment of the power transmission tower 30, reduce the wind load of the power transmission tower 30, and save the manufacturing cost. The support insulator 3210 is connected to the first strain connecting fitting 331, and the cable-stayed insulator 3220 is connected to the first strain connecting fitting 331 or the second strain connecting fitting 332.

[0105] The wire hanging fitting 333 comprises a wire hanging flange cylinder 3331 and a wire hanging part 3332, the wire hanging part 3332 is arranged at the periphery of the wire hanging flange cylinder 3331 and connected to the wire hanging flange cylinder 3331, and is used for hanging the conductors. The wire hanging fitting 333 comprises two wire hanging parts 3332, and the two wire hanging parts 3332 are distributed on both sides of the periphery of the wire hanging flange cylinder 3331 along the radial direction of the wire hanging cylinder 3331, so that the conductors located on both sides of the wire hanging flange cylinder 3331 are respectively connected to the two wire hanging parts 3332, and the conductors located on both sides of the wire hanging flange cylinder 3331 are electrically connected through the jumper. The central axes of the wire hanging flange cylinders 3331 of the two wire hanging fittings 333 are on the same straight line.

[0106] In an embodiment, referring to FIG. 15, the node fitting 330 connects the delta link plate through the insulator string 336 to hang the conductors. The arrangement of the insulator string 336 can make the current transmitted through the jumper without being shunted to the node fitting 330, thereby avoiding the problem of reducing the service life of the node fitting 330 due to heating. In other embodiments, the node fitting can also directly connect the connecting fittings such as the delta link plate according to the actual working conditions to hang the conductors.

[0107] The wire hanging fitting 333 further comprises two third sealing plates 3333. The two third sealing plates 3333 respectively cover the two ends of the wire hanging flange cylinder 3331, and in the radial direction of the wire hanging flange cylinder 3331, the two third sealing plates 3333 protrude from the wire hanging flange cylinder 3331, and the wire hanging part 3332 is located between the two third sealing plates 3333, which is conducive to improving the radial structural strength of the wire hanging flange cylinder 3331, reducing the thickness of the cylinder wall of the wire hanging flange cylinder 3331, reducing the material cost, and preventing water vapor from entering the inside of the wire hanging flange cylinder 3331.

[0108] The first strain connecting fitting 331 comprises two first flange sleeves 3311 and two first connecting flanges 3312 covering the two first flange sleeves 3311 respectively, and the first connecting flanges 3312 are away from the wire hanging part 333. The second ends of the two first flange sleeves 3311 are connected with one of the wire hanging parts 333, and the first ends are connected with the second ends of the two support insulators 3210 through the first connecting flanges 3312 respectively. The end fitting of the support insulator 3210 comprises a second flange sleeve 3211 and a second connecting flange 3212 covering the second flange sleeve 3211, and the second connecting flange 3212 is away from the support insulator 3210. The first connecting flange 3312 and the second connecting flange 3212 are provided with through holes correspondingly, and the detachable connection between the first strain connecting fitting 331 and the support insulator 3210 can be realized by penetrating fasteners in the corresponding through holes. Among them, the second ends of the two first flange sleeves 3311 are close to each other, so that the two first flange sleeves 3311 are combined and connected with the wire hanging part 333, and the first ends of the two first flange sleeves 3311 are separated from each other on the side away from the wire hanging part 333, so that the two first strain connecting fittings 331 form a V-shaped structure, and the connection between the two support insulators 3210 and the two first flange sleeves 3311 can be facilitated.

[0109] Preferably, the two first flange sleeves 3311 are symmetrically arranged on both sides of the central axis of the wire hanging flange sleeve 3331 of the wire hanging part 333, which can ensure that the overall structure formed by the connection of the two first flange sleeves 3311 and the two support insulators 3210 is balanced in stress.

[0110] In order to facilitate operation and maintenance, the second end of the stay insulator 3220 is connected with the second strain connecting fitting 332 through the triangular connecting plate 3321. Among them, the second strain connecting fitting 332 connects the triangular connecting plate 3321, the triangular connecting plate 3321 and the end fitting of the stay insulator 3220 are provided with through holes correspondingly, and the detachable connection between the triangular connecting plate 3321 and the stay insulator 3220 can be realized by penetrating fasteners in the corresponding through holes, and then the detachable connection between the second strain connecting fitting 332 and the stay insulator 3220 can be realized.

[0111] In an embodiment, a second construction hole is arranged on the triangular connecting plate 3321 of the node fitting 330 for connecting the force bearing device 140. Among them, the second construction hole is located on the symmetry axis of the triangular connecting plate 3321, which can not only ensure that the force bearing device 140 does not interfere with the cross arm insulator 320 when installed on the node fitting 330, but also ensure that the overall connecting structure is balanced in stress.

[0112] In another embodiment, as shown in FIG. 14, the second construction hole can also be arranged by installing a third fixing plate 334 on the node fitting 330, and the force bearing device 140 is connected with the third fixing plate 334 through the second construction hole, and then the force bearing device 140 is connected with the node fitting 330. The node fitting 330 includes two third fixing plates 334, which are respectively inserted above and below the first flange cylinder 3311. Each third fixing plate 334 includes a transition plate 3341 and an auxiliary connecting plate 3342 connected perpendicularly with the transition plate 3341. The surface of the transition plate 3341 is parallel to the surface of the third sealing plate 3333 of the wire hanging piece 333. The auxiliary connecting plate 3342 is arranged on the surface of the transition plate 3341 away from the wire hanging piece 333. In this embodiment, the number of auxiliary connecting plates 3342 is two, and the two auxiliary connecting plates 3342 are perpendicular to the transition plate 3341 and arranged perpendicularly to each other. In other embodiments, the number of auxiliary connecting plates can also be one, and the auxiliary connecting plate is perpendicular to the transition plate. At this time, the third fixing plate is a plate piece 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 support insulator, which is not limited here. The second construction hole is arranged on the auxiliary connecting plate 3342, which can ensure that the force bearing device 140 does not interfere with the cross arm insulator 320 when it is installed on the node fitting 330, thereby more conveniently installing the force bearing device 140, and can also ensure that the entire connecting structure is balanced in stress. In other embodiments, the force bearing device can also be connected by arranging a second construction hole on other components of the node fitting, which is not limited here.

[0113] The node fitting 330 further includes a reinforcing plate 335, which is irregularly shaped. One end of the reinforcing plate 335 is connected to the surface of the transition plate 3341 away from the support insulator 3210, and the other end is connected to the third sealing plate 3333 of the wire hanging piece 333 arranged close to the support insulator 3210, thereby further connecting and fixing the third fixing plate 334 with the wire hanging piece 333 and making the structure of the third fixing plate 334 more stable. At the same time, the side surface of the reinforcing plate 335 is connected to the wire hanging flange cylinder 3331 of the wire hanging piece 333 arranged close to the support insulator 3210. The reinforcing plate 335 is arranged in two, which are respectively above and below the wire hanging flange cylinder 3331, i.e., the two reinforcing plates 335 are respectively connected to the two third fixing plates 334 on the first flange cylinder 3311 and the wire hanging flange cylinder 3331.

[0114] In an embodiment, in order to replace the post insulator 3210, two first force bearing devices 141 are arranged in step S11. Before step S11, two first force bearing devices 141 are prepared; step S11 is performed to hoist the first force bearing devices 141 by the hoisting mechanism until the first force bearing devices 141 reach the preset working position. Before step S12, two first construction holes (not shown in the figure) are arranged on the tower body 310, the two first construction holes are arranged in the vertical direction, i.e., the centers of the two first construction holes are located in the same vertical direction, and the two first construction holes are located at the middle positions of the two post insulators 3210 and the tower body 310, the first ends of the two first force bearing devices 141 are connected to the tower body 310 through the two first construction holes respectively, and the second ends are connected to the node fittings 330. Step S12 is performed to arrange the two first force bearing devices 141 at the middle positions of the two post insulators 3210, so that the two post insulators 3210 are symmetrical about the first force bearing devices 141, i.e., the axes of the two first force bearing devices 141 are located in the same vertical plane, and the two post insulators 3210 are symmetrical about the vertical plane, so that the stress of the node fittings 330 in each direction can be balanced, and the stability of the entire connecting structure is improved.

[0115] In other embodiments, the number of first force bearing devices can also be one, three or more, and the specific number is determined in combination with the shape of the node fittings and the size specifications of the post insulators, so as to facilitate the connection with the node fittings and meet the connection strength requirements.

[0116] In the embodiment, the auxiliary connecting plate 3342 of the third fixed plate 334 is provided with a second construction hole for connecting the first force bearing device 141, wherein a plurality of groups of auxiliary clamping plates 143 are arranged to connect the auxiliary connecting plate 3342 and the first connecting piece 1413 arranged at the end of the first force bearing device 141, the first connecting piece 1413 includes a plurality of second inserting plates, each of which is provided with a second mounting hole, the plurality of second inserting plates are respectively inserted at one end of the plurality of groups of auxiliary clamping plates 143, the auxiliary connecting plate 3342 is respectively inserted at the other end of the plurality of groups of auxiliary clamping plates 143, the auxiliary clamping plate 143 is provided with a plurality of through holes, and in step S12, the connection between the first force bearing device 141 and the node fittings 330 can be achieved by inserting fasteners in the through holes and the second construction hole and inserting fasteners in the through holes and the second mounting hole.

[0117] Further, the auxiliary clamping plate 143 is provided with a plurality of through holes, each through hole is uniform in shape and size, each through hole is located at different positions on the auxiliary clamping plate 143, and any through hole on the auxiliary clamping plate 143 can be selected to be fastened with the second construction hole provided on the auxiliary connecting plate 3342 and the second mounting hole provided on the first connecting piece 1413 to realize the connection between the auxiliary clamping plate 143 and the auxiliary connecting plate 3342 and the first connecting piece 1413. The through hole of the auxiliary clamping plate 143 used to connect the auxiliary connecting plate 3342 and the first connecting piece 1413 in one of the cases is defined as a group of through holes, then the through holes on the auxiliary clamping plate 143 can be divided into multiple groups, each group of through holes can be used to connect the auxiliary connecting plate 3342 and the first connecting piece 1413, so that the relative distance between the auxiliary connecting plate 3342 and the first connecting piece 1413 is adjustable, the redundancy of installation is reduced, the installation difficulty is reduced, and the installation efficiency is improved.

[0118] In the embodiment, the number of the second plugs is four, each second plug is vertically arranged on the end face of the second end of the first force bearing device 141, and the number of the auxiliary clamping plates 143 is four. In other embodiments, the number and structure of the second plugs arranged on the end of the first force bearing device, the auxiliary connecting plates arranged on the third fixed plates, and the corresponding auxiliary clamping plates can be determined according to actual conditions, as long as they can be matched to realize the connection between the force bearing device and the node fittings. Of course, the first force bearing device can also be connected to the node fittings by arranging second construction holes on other components of the node fittings, as long as it is convenient to connect the node fittings and can meet the connection strength. Here, no limitation is made.

[0119] The structure of the first force bearing device 141 is consistent with the foregoing, and the process of disassembling and replacing the support insulator 3210 by using the first force bearing device 141 is also consistent with the process of the foregoing support insulator 1210. Here, no longer description is made.

[0120] In another embodiment, as shown in FIG. 11, to replace the cable-stayed insulator 3220, the load bearing device 140 in step S11 is set as the second load bearing device 142. Before step S11, a second load bearing device 142 is prepared; step S11 is performed to hoist the second load bearing device 142 by the hoisting mechanism until the second load bearing device 142 reaches the preset working position. Before step S12, a first construction hole (not shown in the figure) is set on the tower body 310, the first construction hole is located at the middle position between the two cable-stayed insulators 3220 and the tower body 310, the first end of the second load bearing device 142 is connected with the tower body 310 through the first construction hole, and the second end is connected with the node fitting 330 through a second construction hole set on the triangular connecting plate 3321. Step S12 is performed to set the second load bearing device 142 at the middle position between the two cable-stayed insulators 3220, so that the two cable-stayed insulators 3220 are symmetrical about the second load bearing device 142. The two cable-stayed insulators 3220 and the tower body 310 form an isosceles triangle structure, and the second load bearing device 142 is located on the middle line of the base of the isosceles triangle, so that the stress of the node fitting 330 in each direction is balanced, and the stability of the whole connecting structure is improved.

[0121] In other embodiments, the number of second load bearing devices can also be two, three or more, and the specific number is determined in combination with the shape of the node fitting and the size specification of the cable-stayed insulator, so as to meet the convenience of connection with the node fitting and to meet the connection strength.

[0122] The structure of the second load bearing device 142 is consistent with the foregoing, and the process of disassembling and replacing the cable-stayed insulator 3220 by using the second load bearing device 142 is also consistent with the foregoing process of the cable-stayed insulator 1220, which will not be described here again.

[0123] In another application scenario, the composite cross arm only includes the cross arm insulator without setting the independent node fitting, that is, the high-voltage end of the composite cross arm is directly hung with the conductor without passing through the node fitting, the cross arm insulator includes one support insulator and one cable-stayed insulator, the first end of the support insulator and the first end of the cable-stayed insulator are detachably connected with the tower body, the second end of the support insulator and the second end of the cable-stayed insulator are connected, that is, the cable-stayed insulator is detachably connected with the end fitting of the second end of the support insulator, and the composite cross arm directly hangs the conductor through the end fitting of the support insulator. At this time, the operation and maintenance method of the present application can only replace the cable-stayed insulator, and cannot replace the support insulator, and the cable-stayed insulator is replaced by using the aforementioned second force receiving device 142, which will not be described in detail. Further, in the cross arm insulator operation and maintenance scenario without setting the node fitting, the cross arm insulator can include a plurality of support insulators and a plurality of cable-stayed insulators, the cable-stayed insulator is detachably connected with the end fitting of the second end of the support insulator, and the composite cross arm directly hangs the conductor through the end fitting of the support insulator, then the operation and maintenance method of the present application can only replace the cable-stayed insulator.

[0124] In the present embodiment, the first force receiving device 141 is used to replace the support insulator 1210, and the second force receiving device 142 is used to replace the cable-stayed insulator 1220. In other embodiments, the first force receiving device can be used to replace the cable-stayed insulator, and the second force receiving device can be used to replace the support insulator, as long as the replacement of the cross arm insulator can be realized, which is not limited herein.

[0125] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part 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, which should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A force bearing device for replacing a cross arm insulator mounted on a power transmission tower, characterized in that, The force bearing device comprises a regulating member, a force bearing member and a connecting member connected in sequence, the first end of the regulating member is used for connecting with the tower body of the power transmission tower, the second end is fixedly connected with the first end of the force bearing member, the second end of the force bearing member is fixedly connected with the connecting member, and the regulating member is used for adjusting the length of the force bearing device.

2. The force transfer device of claim 1, wherein The regulating member comprises an outer cavity and an inner cavity, the inner cavity is a solid or hollow columnar structure, the outer cavity is a hollow columnar structure, the inner cavity is located in the hollow inner cavity of the outer cavity, and the outer cavity and the inner cavity are coaxially arranged in the axial direction of the regulating member, and the relative positions of the outer cavity and the inner cavity along the axial direction of the regulating member are adjustable.

3. The force transfer device of claim 2, wherein, The regulating member further comprises a first driving member and a first transmission member connected with the outer cavity and the inner cavity respectively, the first driving member drives the first transmission member to move, and the first transmission member drives the inner cavity to move along the axial direction of the outer cavity.

4. The force transfer device of claim 1, wherein, The second end of the regulating member is provided with a first flange plate, the first end of the force bearing member is provided with a second flange plate, the first flange plate is correspondingly matched and connected with the second flange plate, so that the regulating member and the force bearing member are fixedly connected.

5. The force transfer device of claim 1, wherein, The connecting member comprises a second plug plate, the number of the second plug plate is two, and the two second plug plates are arranged in parallel with each other, or the two second plug plates are arranged perpendicular to each other.

6. The force transfer device of claim 1, wherein The first end of the regulating member is connected with the tower body through a hinge member, so that the force bearing device can rotate relative to the tower body.

7. The force transfer device of claim 1, wherein The regulating member comprises a pull wire member, a second driving member and a second transmission member, the first end of the pull wire member is connected with the second transmission member, the second end is connected with the force bearing member, the length of the pull wire member is adjustable, and the second driving member drives the second transmission member to move.

8. A method for operating and maintaining a power transmission tower, the power transmission tower comprising a tower body and a composite cross arm arranged on the tower body, a low-voltage end of the composite cross arm being connected to the tower body, a high-voltage end of the composite cross arm being used for hanging a conductor, the composite cross arm comprising at least one cross arm insulator, a first end of the cross arm insulator being detachably connected to the tower body, a second end of the cross arm insulator being detachably connected to the high-voltage end of the composite cross arm, the method being used for replacing the cross arm insulator, and characterized in that, The force bearing device of claim 1 is adopted, comprising the following steps: S11: hoisting the force bearing device to a preset working position; S12: installing the force bearing device, connecting the first end of the force bearing device to the tower body and connecting the second end to the high-voltage end of the composite cross arm; S13: adjusting the length of the force bearing device to loosen the cross arm insulator to be replaced and remove the cross arm insulator to be replaced; S14: installing a new cross arm insulator; S15: removing the force bearing device.

9. The transmission tower operation and maintenance method according to claim 8, characterized in that, Before the step S11, the force bearing device is assembled; in the step S12, the force bearing device is connected to the high-voltage end of the composite cross arm through the connecting member and connected to the tower body through the regulating member; in the step S13, the length of the force bearing device is adjusted through the regulating member.

10. The transmission tower operation and maintenance method according to claim 8, characterized in that, The composite cross arm further comprises a node fitting, the cross arm insulator is detachably connected with the node fitting and the tower body, the cross arm insulator comprises a support insulator and a cable-stayed insulator, the first end of the support insulator and the first end of the cable-stayed insulator are connected with the tower body, and the second end of the support insulator and the second end of the cable-stayed insulator are connected through the node fitting.

11. The transmission tower operation and maintenance method according to claim 10, characterized in that, The node fitting comprises two clamping plates arranged in parallel with each other, two outer plates of the two clamping plates are respectively connected with fixing plates, the support insulator and the cable-stayed insulator are respectively inserted between the two clamping plates through connecting fittings, and the clamping plates are provided with wire hanging holes for hanging the conductors.

12. The transmission tower operation and maintenance method according to claim 10, characterized in that, Before the step S11, two force bearing devices are prepared, and in the step S12, the two force bearing devices are arranged on the two sides of the cross arm insulator, and the two force bearing devices are symmetrical about the axis of the cross arm insulator.

13. The transmission tower operation and maintenance method according to claim 8, characterized in that, The composite cross arm further comprises a node fitting, the cross arm insulator is detachably connected with the node fitting and the tower body, the cross arm insulator comprises two support insulators and two cable-stayed insulators, the first end of the two support insulators and the first end of the two cable-stayed insulators are connected with the tower body, and the second end of the two support insulators and the second end of the two cable-stayed insulators are connected through the node fitting.

14. The transmission tower operation and maintenance method according to claim 13, characterized in that, The node fitting comprises a first strain connecting fitting, a second strain connecting fitting and two wire hanging pieces, the first strain connecting fitting comprises two first flange sleeves and two first connecting flange plates covering the two first flange sleeves respectively, the two wire hanging pieces are connected at the opposite ends of the second strain connecting fitting respectively, the first strain connecting fitting is connected with the second strain connecting fitting through the wire hanging pieces arranged close to the tower body, the support insulator is connected with the first strain connecting fitting, the cable-stayed insulator is connected with the first strain connecting fitting or the second strain connecting fitting, and the wire hanging pieces are used for hanging the conductors.

15. The transmission tower operation and maintenance method according to claim 13, characterized in that, The node fitting comprises a first connecting plate, two second connecting plates and a shielding ring, the first connecting plate comprises a first surface and a second surface arranged oppositely, the first connecting plate is used for connecting the second end of the support insulator, the two second connecting plates are arranged on the first surface in a spaced manner and connected with the first surface on the side surface, the second connecting plates are used for connecting the second end of the cable-stayed insulator, and the shielding ring is installed on the first surface.

16. The transmission tower operation and maintenance method according to claim 13, characterized in that, Before the step S11, at least one force bearing device is prepared, and in the step S12, the at least one force bearing device is arranged between the two support insulators or between the two cable-stayed insulators, so that the two support insulators or the two cable-stayed insulators are symmetrical about the force bearing device.

17. The transmission tower operation and maintenance method according to claim 8, characterized in that, Before the step S12, a construction hole is arranged on the tower body, and in the step S12, the force bearing device is connected to the tower body through the construction hole.

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