Method for erecting a power transmission line on a bridge

Abstract

The present application belongs to the technical field of power transmission line erection, and particularly relates to a method for erecting a power transmission line on a bridge, comprising the following steps: S1. erecting a cross arm, and mounting one end of the cross arm to the bridge; S2. mounting an insulator string at each end of the cross arm, the bottom of the insulator string being clamped to the power transmission line, the power transmission line being a direct current line or an alternating current line; and S3. mounting the cross arm at one end to the bridge through a clamping assembly, the clamping assembly being used for connecting the cross arm to the bridge and assisting in the installation or maintenance of the power transmission line. The present application does not occupy the road when erecting the line on the bridge, can ensure normal driving of vehicles, avoid causing traffic pressure, has a simple structure, is easy to install and maintain, reduces the labor intensity of workers, improves the erection efficiency, avoids wind deviation flashover of the power transmission line, saves the cost of towers, is low in cost, and is convenient to popularize.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line erection technology, specifically relating to a method for erecting power transmission lines on bridges. Background Technology

[0002] my country has numerous AC, DC high-voltage, ultra-high-voltage, and extra-high-voltage transmission lines, some reaching thousands of kilometers in length, inevitably crossing rivers and valleys. Currently, the common method is to erect very tall towers on both sides of the crossing point, raising the transmission conductors to pass through. For large crossings, additional towers are needed in the middle for support. This method is difficult to construct, expensive, results in large conductor spans that are prone to swaying, and the tall towers make line maintenance difficult. Some transmission lines use cables buried underwater, which is also expensive and difficult to maintain; a very small number use underwater cables, which is also expensive and difficult to maintain; and a very small number use gas-insulated metal enclosures, requiring tunnel excavation, which is very expensive. Especially when transmission lines cross bridges, the common practice is to either bury the cables in the bridge during its initial construction or erect tall towers on both sides of the bridge to facilitate the passage, but both methods are costly and also detrimental to subsequent maintenance.

[0003] For example, the invention with authorization announcement number CN 212271777 U discloses a transmission tower for erecting transmission lines, including a base, an electric telescopic pole, crossarms, and terminals. A top rod is fixedly connected to the top of the electric telescopic pole, and a rotating shaft is installed on the top of the top rod. A bearing is fitted at the lower end of the rotating shaft, and the rotating shaft and the top rod are rotatably connected via the bearing. A crossarm is fixedly connected to the top of the rotating shaft, and fan blades are installed at both ends of the crossarm. Crossarms are symmetrically installed on the left and right sides of the top rod, and the crossarms are hinged to the top rod. Terminals are distributed on the lower surface of the crossarms, and a telescopic mechanism is provided above the crossarms. One end of the telescopic mechanism is hinged to the top rod. This invention allows adjustment of the tilt angle of the crossarms according to the actual cable erection requirements. However, this transmission tower is not suitable for erecting transmission lines on bridges, where wind speeds are high. In such cases, if the transmission line is erected at a higher location using a transmission tower, the wind force on the transmission line will be even greater, causing this part of the transmission line to sway directly under the wind load, leading to wind-induced flashover.

[0004] For example, the invention with authorization announcement number CN 112054454 B discloses a protective device for laying cables on roads and bridges. The protector has a main wire hole on its surface, a partition plate is fixedly connected inside the mounting opening, a guide rail is fixedly connected to the inner surface of the partition plate, an end pulley is rotatably connected to the bottom end of the guide rail, a traction rope is wound around the surface of the end pulley, a pull seat is movably connected inside the guide rail, a roller is rotatably connected to the bottom surface of the pull seat, the roller is rolled inside the guide rail, and a top pulley is rotatably connected to the top end of the guide rail. A plug-in rod is threadedly connected to a spiral column, which rotates inside the spiral column. The rotating rod rises and falls inside the spiral column, and a spring rod pulls the traction rope to lower a limiting rod, preventing the rotating rod from falling off. This achieves the goal of supporting the cable and preventing direct contact with materials such as cement. However, the operation of this protective device is too complex. To ensure the cable is securely installed, the protector needs to be installed on the bridge, and then the main structure of the protective device is installed on top of it. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for erecting power transmission lines on bridges, thereby improving the efficiency of power transmission line erection.

[0006] This invention discloses a method for erecting power transmission lines on bridges, comprising the following steps: S1. Erect the crossarm and install one end of the crossarm onto the bridge; S2. Install insulator strings at both ends of the crossarm, with the bottom of each insulator string clamped to the power transmission line, which is a DC line or an AC line; S3. One end of the crossarm is installed on the bridge via a clamping assembly, which is used to connect the crossarm to the bridge and assist in the installation or maintenance of the power transmission line.

[0007] Furthermore, the clamping assembly includes a U-shaped frame, a rotating shaft, a bearing seat, and a slot. The rotating shaft is fixed through and fixed to one end of the crossarm near the bridge. Holes are provided on both sides of the U-shaped frame, and the two ends of the rotating shaft pass through the holes to be rotatably mounted on the U-shaped frame. The bearing seat is mounted on one end of the rotating shaft, and the slot is mounted on the other end of the rotating shaft.

[0008] Furthermore, the slot is a hollow groove, and a locking block is provided inside the groove; a rocker arm is provided in conjunction with the slot, and the rocker arm has an L-shaped structure with a protrusion at the end, and the protrusion has a groove that engages with the locking block on the slot.

[0009] Furthermore, the top of the U-shaped frame is provided with a rotatable first limiting rod, and the end of the first limiting rod is provided with at least one hole three. The top of the crossarm near the rotating shaft is provided with at least one hole four. A screw is used to pass through the hole three and the hole four to limit the crossarm in the vertical direction.

[0010] Furthermore, the top of the crossarm is provided with an L-shaped barb.

[0011] Furthermore, the crossarm consists of a single bar.

[0012] In a further optimized version, the crossarm consists of two rods, rod one and rod two, which are installed in sequence and rotated in turn.

[0013] Furthermore, multiple auxiliary devices are installed at equal intervals on one side of the bridge.

[0014] Transmission lines are lines that transmit electrical energy from power plants to load centers and serve as interconnecting lines within the power system. Therefore, the steady improvement of transmission line erection technology is a prerequisite for the robust development of the power industry. Based on the terrain, conditions, and importance of the line within the power system, pole-type auxiliary erection devices are currently widely used for transmission line construction. However, the installation of pole structures requires site surveying, and maintenance necessitates climbing to the top of the tower, presenting certain inconveniences. Furthermore, due to the vast land area and complex and varied environmental conditions in different regions, transmission lines often need to cross bridges, culverts, and tunnels. In these environments, pole-type erection requires foundations to provide strong support and ensure the tower's stability. Moreover, for long crossing distances, the crossing and laying of transmission lines becomes difficult, and pole construction is arduous and extremely dangerous. Furthermore, transmission line erection is only the first step in its operation; subsequent inspections of the line equipment and the installation of transmission lines and protection devices on the poles are necessary, making these inspections extremely challenging.

[0015] For ultra-long bridges, if only towers are erected on both sides to support the transmission lines, the supporting capacity of the transmission lines in the middle of the bridge is insufficient. This makes them vulnerable to severe weather events such as strong winds, temperature drops, rain, and snow, leading to varying degrees of conductor icing and galloping. In severe cases, this can cause line tripping, power outages, substation voltage loss, and power plant unit shutdowns. The scale of the damage and the number of affected devices are unprecedented, making the power grid's peak winter load situation exceptionally severe. If additional towers are installed on the bridge, the base of the towers has weak bearing capacity, making them prone to insecure fixing. Furthermore, the towers themselves need to be fixed to the bridge, increasing the difficulty and danger of maintenance.

[0016] In addition to using poles to erect power transmission lines, when erecting power transmission lines on bridges in cities, the power transmission lines are often installed at the bottom of the road on the bridge. During maintenance, it is sometimes necessary to dig up the road on the bridge. The maintenance process is complicated and will occupy the road on the bridge, which will not be able to guarantee the normal driving of vehicles and will also cause traffic pressure. Relatively speaking, the structure is also more complicated, and installation and maintenance are more difficult.

[0017] This invention addresses the technical problem of erecting a transmission line on a bridge using a crossarm and two insulator strings, and fixing the transmission line with the bridge as a support. This is a technique that is not easily discovered, and the specific reasons are as follows: First, the conventional practice for erecting power transmission lines is to use poles or towers or to lay the power transmission lines directly on the road of the bridge. Designers may not realize that in actual use, the bridge itself can be used as a support to install power transmission lines. Secondly, since crossarms and insulator strings are often used as auxiliary equipment for line erection on poles and towers, users of this structure may not think of combining them with bridges to create a low-cost and simple erection auxiliary device. Third, for auxiliary devices that can fix an object to a structure, it is difficult for designers to think of using a slot with a locking block to combine with a rocker arm to achieve the effect of controlling the erection or maintenance of power transmission lines in a time-saving, labor-saving and safe manner. Fourth, it is difficult for designers to conceive of using the inherent characteristics of the crossarm itself to deform the crossarm into a structure in which two poles rotate sequentially, thereby achieving the effect of easily recovering auxiliary devices and transmission lines when inspecting or altering the line.

[0018] In summary, participants in the design, production, and maintenance of transmission lines are unlikely to realize that bridges can be used as poles for fixed installation of transmission lines. They are even less likely to think of the technical effect of making the installation, recycling, and maintenance of transmission lines simpler, safer, and less labor-intensive by simply deforming the crossarms through such an easy-to-implement technical solution.

[0019] The beneficial effects of this invention are as follows: In this method, the transmission line is installed outside the bridge, which does not occupy the space on the bridge. When this part of the transmission line is maintained, it will not affect the normal driving of vehicles on the road, avoid traffic pressure, improve the erection efficiency, and the transmission line is erected under the bridge, which reduces the wind resistance of the transmission line and reduces the occurrence of power faults such as wind-induced flashover. By combining crossarms and insulator strings, the transmission line section is clamped onto the insulator strings, resulting in low structural cost. Furthermore, the crossarms and insulator strings form a triangular structure, which is stable and not prone to shaking. Adding a clamping component that can indirectly control the rotation position of the crossarm and insulator string allows for the rotation of the crossarm of the transmission line when installing transmission lines or when maintenance devices are required. This is achieved by manually inserting the rocker arm into the slot and rotating the rocker arm, or by using a long rod with a hook to hook the L-shaped barb, thus bringing the transmission line closer to the maintenance personnel for replacement or repair. This reduces the labor intensity of the workers and improves maintenance efficiency. A rotatable first limiting rod is installed above the U-shaped frame to clamp the transmission line between two insulator strings. After the triangular structure containing the crossarm and insulator strings is rotated to the horizontal, the first limiting rod is rotated until hole three on the first limiting rod is in line with hole four on the top of the crossarm. Then, it is fixed with bolts. By adding the first limiting rod to limit the crossarm in the vertical direction, the erection and installation of the transmission line can be made more stable. The crossarm can be a single pole or two poles connected together in sequence. When the crossarm is the latter, the crossarm is broken to make it easier to recover. By folding the crossarm, the transmission line clamped at the bottom of the insulator string can be brought closer to the maintenance personnel, which facilitates the disassembly and assembly of the entire device and the close-range maintenance of the transmission line. Anti-loosening warning bolts can be installed at the connection of holes three and four to ensure the reliable installation of the auxiliary device. If the warning bolts become loose, an alarm message can be sent to the corresponding backend of the warning bolts for appropriate maintenance. This invention allows for the installation of tracks on bridges without obstructing roads, ensuring normal vehicle traffic and avoiding traffic congestion. It features a simple structure, is easy to install and maintain, reduces the labor intensity of workers, improves installation efficiency, and is low in cost, making it easy to promote. Attached Figure Description

[0020] Figure 1 This is an overall view of the erection of a method for erecting power transmission lines on a bridge according to Embodiment 1 of the present invention.

[0021] Figure 2 This is an enlarged schematic diagram of Embodiment 1 of a method for erecting power transmission lines on a bridge according to the present invention. Figure 1 .

[0022] Figure 3 This is a schematic diagram of a U-shaped frame for a method of erecting power transmission lines on a bridge according to the present invention.

[0023] Figure 4 This is a schematic diagram of a rocker arm for a method of erecting power transmission lines on a bridge according to the present invention.

[0024] Figure 5 This is an overall diagram of an embodiment 1 of the method for erecting power transmission lines on a bridge during the erection or maintenance of power transmission lines according to the present invention.

[0025] Figure 6This is an enlarged schematic diagram of an embodiment 1 of the method for erecting power transmission lines on a bridge during the erection or maintenance of power transmission lines according to the present invention.

[0026] Figure 7 This is an overall view of the erection of a method for erecting power transmission lines on a bridge according to Embodiment 2 of the present invention.

[0027] Figure 8 This is an enlarged schematic diagram of the second embodiment of the method for erecting power transmission lines on a bridge according to the present invention, after the line has been erected.

[0028] Figure 9 This is an overall diagram of the erection or maintenance of a method for erecting power transmission lines on a bridge, according to Embodiment 2 of the present invention.

[0029] Figure 10 This is an enlarged schematic diagram of an embodiment 2 of the method for erecting power transmission lines on a bridge according to the present invention, during the erection or maintenance process.

[0030] Figure 11 This is an enlarged schematic diagram of the fixing ring in a method for erecting power transmission lines on a bridge according to the present invention. Figure 1 .

[0031] Figure 12 This is an enlarged schematic diagram of the fixing ring in a method for erecting power transmission lines on a bridge according to the present invention. Figure 2 .

[0032] The attached diagram shows: 1: crossarm, 2: insulator string, 3: transmission line, 4: barb, 5: U-shaped frame, 6: rotating shaft, 7: bearing seat, 8: slot, 9: hole one, 10: hole two, 11: hole three, 12: hole four, 13: rocker arm, 14: first limit rod, 15: lifting ring, 16: fixing ring, 17: stationary rod, 18: L-shaped hook, 19: hole five, 20: hole six, 21: rod body one, 22: rod body two, 23: receiving groove, 24: second limit rod, 25: extension plate. Implementation

[0033] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. It should be noted that the terms "a," "b," etc., used in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such terms can be interchanged where appropriate. It should also be noted that in this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" generally refer to the direction shown in the drawings, or to the vertical, perpendicular, or gravitational direction of the component itself. Similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours relative to the components themselves, but these directional terms are not intended to limit the present invention. Example

[0034] like Figure 1-6 As shown, a method for erecting a power transmission line on a bridge, which assists in the erection of a power transmission line 3 on the bridge, includes the following steps: S1. Erect crossbeam 1, and install one end of crossbeam 1 onto the bridge, using the bridge as a fulcrum to support the erection of the auxiliary device. S2. Install insulator strings 2 at both ends of the crossarm 1. The bottom of each insulator string 2 is clamped to the transmission line 3. The transmission line 3 is a DC line or an AC line. The type is not limited and can be an overhead conductor, cable or gas-insulated metal-enclosed transmission line, etc.

[0035] S3. One end of the crossarm 1 is installed on the bridge via a clamping assembly. The clamping assembly is used to connect the crossarm 1 to the bridge and to assist in the installation or maintenance of the transmission line 3.

[0036] The clamping assembly includes a U-shaped frame 5, a rotating shaft 6, a bearing seat 7, and a slot 8. The rotating shaft 6 is horizontally welded to one end of the crossarm 1 near the bridge. Holes 9 are provided on both sides of the U-shaped frame 5. One end of the crossarm 1 is rotatably mounted on the U-shaped frame 5 through the rotating shaft 6 passing through the holes 9. Both ends of the rotating shaft 6 protrude from the holes 9. The bearing seat 7 is rotatably mounted on one end of the rotating shaft 6 and fixed to the U-shaped frame 5. The slot 8 is fixedly mounted on the other end of the rotating shaft 6.

[0037] The slot 8 is a cylindrical hollow groove with a locking block inside. A rocker arm 13 is provided in conjunction with the slot 8. The rocker arm 13 has an L-shaped structure with a cylindrical protrusion at one end. The cylindrical protrusion has a groove that engages with the locking block on the slot 8.

[0038] The top of the U-shaped frame 5 is provided with a first limiting rod 14 that can rotate horizontally. One end of the first limiting rod 14 is rotatably installed at the second hole 10 at the top of the U-shaped frame 5 by bolts. The other end of the first limiting rod 14 has two third holes 11. The top of the crossarm 1 near the bridge is provided with two fourth holes 12. Ordinary bolts or anti-loosening warning bolts are used to pass through the third holes 11 and the fourth holes 12 to limit the crossarm 1 in the vertical direction.

[0039] In this embodiment, the crossarm 1 is a single rod. An L-shaped barb 4 is provided at the top of the crossarm 1. The crossarm 1 can be rotated by inserting the rocker arm 13 into the slot 8 to rotate the shaft 6, or the crossarm 1 can be driven to rotate by hooking the barb 4 with a long rod with a hook.

[0040] The transmission line section 3 is clamped at the bottom of two insulator strings 2. The insulator strings are suspension insulator strings. In this embodiment, the specific clamping structure is as follows: Figure 7-8 As shown, specifically, lifting rings 15 are provided at the bottom of both sides of the crossarm 1. The tops of the two insulator strings 2 are respectively installed on the lifting rings 15, and the bottoms of the two insulator strings 2 are provided with fixing rings 16. The transmission line 3 is partially clamped to the bottom of the insulator strings 2 by the fixing rings 16. In this embodiment, the fixing ring 16 has a U-shaped structure, including a stationary rod 17 and a rotatable L-shaped hook 18. The top of the L-shaped hook 18 is rotatably installed on the insulator string 2, and the other end of the L-shaped hook 18 is provided with an opening slot. Holes 19 are provided through the side of the opening slot on the same straight line. The top of the stationary rod 17 is fixed to the insulator string 2, and the bottom of the stationary rod 17 is provided with a hole 20. After clamping the transmission line 3 or cable between the stationary rod 17 and the L-shaped hook 18, the L-shaped hook 17 is rotated, and bolts are used to clamp the transmission line 3 onto the insulator string 2 by connecting the holes 19 and 20.

[0041] Four auxiliary devices are installed at equal intervals on one side of the bridge. These four auxiliary devices clamp multiple parts of the transmission line 3 to ensure its secure installation and reduce the occurrence of power faults such as wind-induced flashover.

[0042] The specific implementation steps of this invention are as follows: When installing the transmission line 3, first weld or fix the U-shaped frame 5 to the side of the bridge by bolts, then pass the rotating shaft 6 installed on one side of the crossarm 1 through the holes 9 on both sides of the U-shaped frame 5. Install the bearing seat 7 on one end of the rotating shaft 6 and weld the groove 8 on the other end of the rotating shaft 6. The transmission line 3 is clamped at the fixed ring 16 at the end of the two insulator strings 2 respectively. The L-shaped hook 18 is rotated and the fixed ring 16 is closed by passing the bolt through the holes 7 and 8. Then, the crossarm 1 is slowly rotated to the horizontal position by hand cranking the rocker arm 13, or the crossarm 1 is slowly placed in the horizontal direction by hooking the barb 4 on the crossarm 1 with a long rod. Once the crossarm 1 is in the horizontal position, rotate the first limit rod 14 and use bolts through holes 3 11 and 4 12 to limit the crossarm 1 in the vertical direction to ensure the stability of the transmission line 3 and prevent wind-induced swaying and flashover. When it is necessary to remove or repair, first remove the bolts of fixing holes 11 and 12 on the first limiting rod 14, rotate the first limiting rod 14 to remove the limitation of the first limiting rod 14 on the crossarm 1, and then directly control the crossarm 1 by hand cranking the rocker arm 13 or by hooking the barb 4 with a long rod. The rotation of the crossarm 1 will drive the transmission line 3 clamped at the bottom of the insulator string 2 on it to rotate, thereby bringing the transmission line 3 closer to the maintenance personnel, and then the maintenance can be carried out.

[0043] However, in Embodiment 1, the crossarm 1 consists of only a single rod. If maintenance is required, the slot on the clamping assembly is rotated by a rocker until the crossarm 1 can no longer tilt. This position is the closest distance between the maintenance personnel and the power transmission line, but this distance is still too far, and there are still too many inconveniences in actual maintenance. Example

[0044] like Figure 7-10 As shown, a method for erecting power transmission lines on a bridge is described in this embodiment, which is an optimization of the crossarm 1 based on Embodiment 1. Specifically, the crossarm 1 consists of two poles, pole 1 21 and pole 22, which are installed in sequence and rotated. Pole 1 21 is positioned close to the bridge, while pole 22 is positioned away from the bridge. A rotating shaft is horizontally fixed to the side of pole 1 21 closest to the bridge. A hole 7 is horizontally provided at the end of pole 1 21. Mounting plates extend outward from both sides of the end of pole 22 closest to pole 1 21. Holes 8 are symmetrically provided on the mounting plates. A rotating shaft is used to rotatably connect pole 22 to pole 1 21 by passing through holes 7 and 8. An extension plate 25 is provided at the bottom of the end of rod 1 21. The extension plate 25 is used to partially support rod 22 at the end of rod 1 21. A second limiting rod 24 is horizontally and rotatably installed at the top of rod 1 21 near the end position. A hole 9 is opened at the end of the second limiting rod 24. A hole 10 is opened at the top of rod 22. Bolts are used to pass through holes 9 and 10 to further fix rod 22 at the end of rod 1 21.

[0045] The specific implementation steps of this embodiment are as follows: When installing the transmission line 3, first weld or fix the U-shaped frame 5 to the side of the bridge by bolts, then pass the two ends of the rotating shaft 6 installed on one side of the crossarm 1 through the holes 9 on both sides of the U-shaped frame 5, install the bearing seat 7 on one end of the rotating shaft 6, and weld the groove 8 on the other end of the rotating shaft 6. At this time, the first rod 21 and the second rod 22 on the crossarm 1 are set at an acute angle, and the transmission line 3 is clamped at the fixing ring 16 at the end of the two insulator strings 2 respectively. Rotate the L-shaped hook, and then pass the bolt through the hole seven and the hole eight to form a closed loop of the fixing ring 16. Rotate rod 22 to the same horizontal plane as rod 121, and rotate the second limiting rod 24 horizontally until hole 9 on the second limiting rod 24 and hole 10 on rod 22 are in the same straight line. Use bolts to pass through holes 9 and 10 to further fix the connection between rod 22 and rod 12. The crossarm 1 can be slowly rotated to a horizontal position by hand cranking the lever 13, or the crossarm 1 can be slowly placed horizontally by hooking the hook 4 on the long rod. After the crossarm 1 is rotated to the horizontal position, the first limiting rod 14 is rotated horizontally until the third hole on the first limiting rod 14 and the fourth hole on the rod body 21 are in the same straight line. The crossarm 1 is then limited in the vertical direction by bolts passing through the third hole 11 and the fourth hole 12 to ensure the stability of the transmission line 3 and to prevent wind-induced swaying and flashover. When it is necessary to remove or repair, first remove the bolts from the fixing holes 11 and 12 on the first limiting rod 14, rotate the first limiting rod 14 horizontally, and then rotate the crossarm 1 by hand-cranking the rocker arm 13 or hooking the barb 4 with a long rod to move it closer to the maintenance personnel. After reaching the closest point, remove the second limiting rod 24 from limiting the second rod body 22, rotate the second rod body 22 to move it closer to the first rod body 21, thereby driving the transmission line 3 at the bottom of the insulator string 2 to rotate towards the bridge to the limit position, and then the maintenance can be carried out. Example

[0046] like Figure 8 As shown, a method for erecting transmission lines on a bridge is described in this embodiment, which is an optimization of the crossarm 1 based on embodiment 3. A receiving groove 23 is provided on the first pole 21 of the crossarm 1. The receiving groove 23 and the L-shaped barb 4 are symmetrically arranged with respect to the rotational connection points of the first pole 21 and the second pole 22, so that the L-shaped barb 4 on the second pole 22 is partially housed in the receiving groove 23 after folding. This results in a higher degree of folding of the first pole 21 and the second pole 22, and the transmission line 3 clamped at the bottom of the insulator string 2 is closer to maintenance personnel, making maintenance easier.

[0047] In this embodiment, at all locations where bolted connections are used, a nut is provided at the bottom of the bolt.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for erecting power transmission lines on a bridge, characterized in that, Includes the following steps: S1. Erect the crossarm and install one end of the crossarm onto the bridge; S2. Install insulator strings at both ends of the crossarm, with the bottom of each insulator string clamped to the power transmission line, which is a DC line or an AC line; S3. One end of the crossarm is installed on the bridge via a clamping assembly, the clamping assembly being used to connect the crossarm to the bridge and to assist in the installation or maintenance of the power transmission line; The clamping assembly includes a U-shaped frame, a rotating shaft, a bearing seat, and a slot. The rotating shaft is fixed through and on one end of the crossarm near the bridge. The U-shaped frame has holes on both sides, and the two ends of the rotating shaft pass through the holes to be rotatably mounted on the U-shaped frame. The bearing seat is mounted on one end of the rotating shaft, and the slot is mounted on the other end of the rotating shaft. The slot is a hollow groove, and a locking block is provided inside the groove; a rocker arm is provided in conjunction with the slot, and the rocker arm is an L-shaped structure with a protrusion at the end, and the protrusion has a groove that engages with the locking block on the slot; The top of the U-shaped frame is provided with a rotatable first limiting rod, and the end of the first limiting rod is provided with at least one hole three. The top of the crossarm near the rotating shaft is provided with at least one hole four. A screw is used to pass through the hole three and the hole four to limit the crossarm in the vertical direction.

2. A method for erecting power transmission lines on a bridge according to claim 1, characterized in that, The top of the crossarm is provided with an L-shaped barb.

3. A method for erecting power transmission lines on a bridge according to claim 2, characterized in that, The crossarm consists of a single bar.

4. A method for erecting power transmission lines on a bridge according to claim 2, characterized in that, The crossarm consists of two rods, rod one and rod two, which are installed in sequence and rotated in turn.

5. A method for erecting power transmission lines on a bridge according to claim 3 or 4, characterized in that, Multiple auxiliary devices are installed at equal intervals on one side of the bridge.

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