Conductor sealing and protection device and its usage method

Abstract

This invention discloses a conductor sealing and protection device, mainly comprising a fixing frame, a sealing rope, and a zipline pulley. The fixing frame is in a straight line shape, with multiple clamps evenly arranged on it. Both ends of the fixing frame have sealing rope fixing rings. Both ends of the sealing rope have safety buckles that match and connect to the sealing rope fixing rings at both ends of the fixing frame. The zipline pulley is installed on the lower surface of the fixing frame. Based on this, the inventors have also developed a corresponding method for using the device. This invention features a reasonable design, simple structure, lightweight and compact design, ease of use, and good performance, making it suitable for widespread application in conductor replacement and sealing operations.

Description

Technical Field

[0001] This invention belongs to the field of power transmission and transformation engineering construction technology, and in particular relates to a conductor sealing and protection device and its usage method. Background Technology

[0002] As ultra-high voltage transmission lines age, there is an increasing number of cases where aging conductors need to be replaced when these lines cross high-speed railways, highways, electrified railways, and other transmission lines. During conductor replacement construction, to prevent damage to the objects being crossed due to accidents such as conductor breakage during tensioning and pulling, a reliable protective net needs to be erected above the objects to ensure their safety.

[0003] Currently, the Southern Power Grid covers over 13,000 kilometers of ultra-high voltage (UHV) and above power lines, spanning approximately 2,000 kilometers east to west. These lines traverse areas with complex geological structures and diverse weather conditions. Many UHV lines were constructed in the 1980s and 90s, and after three to four decades, the conductors have aged to varying degrees and require replacement. With the increasing number of crossings beneath these lines, conductor joints within the crossing spans no longer meet operational requirements and also necessitate timely conductor replacement. UHV line conductors typically employ four-split or six-split configurations.

[0004] Ensuring the safety of high-speed railway operation and construction crossings has become an urgent issue that needs to be addressed. my country implements the safety operation principle of "no construction during operation and no operation during construction" for high-speed railways. Nighttime tension stringing construction crossing high-speed railways must be carried out during the "maintenance window" when trains are not running at night. The tight schedule and poor visibility at night pose new challenges to traditional tension stringing construction technology and construction organization.

[0005] Common internet blocking techniques currently include:

[0006] (1) Use enclosed pulleys for netting. This involves using multiple enclosed pulleys fixed to the sub-conductors of each phase (pole) of the original line to provide protection during conductor replacement. The disadvantages are: the pulleys are made entirely of metal, have a large weight, and are not conducive to installation and removal; if the pulleys are fully enclosed, the resistance to laying the conductor increases, and if they are not enclosed, the conductor may jump out of the trench.

[0007] (2) Interphase (pole) sealing net. This involves installing a protective net between the outermost sub-conductors on both sides of the original line. Its disadvantages include: the conductors will sway during tension stringing; the interphase sealing net is an open structure, and the sealing rope cannot provide sufficient safety protection width for the conductors to be replaced, posing a safety threat to objects being crossed below the conductors; the net rope needs to be securely tied between the outermost conductors of the two phases, making installation and removal time-consuming and labor-intensive, requiring multiple high-altitude personnel to cooperate on both phases, resulting in low construction efficiency; to ensure the replaced conductors avoid friction with the sealing rope during tension stringing, the conductors need to maintain high tension, increasing the possibility of the old conductors breaking, posing a significant safety hazard to objects being crossed, and making it difficult to guarantee construction safety.

[0008] (3) Use 360° limiters on two adjacent conductors within the span to achieve mutual protection. The disadvantages are: (When two conductors enter a 360° limiter ring together, one is pulled while the other is stationary as a load-bearing protection line. During the laying process, it is difficult to avoid mutual friction, which damages the line and increases the friction force during laying; at least 6-8 360° limiters are needed at each important crossing point. The limiters need to be connected by ropes to prevent slippage, which increases the installation time of safety measures; after each conductor is replaced, high-altitude workers need to go up to adjust the conductor in the 360° limiter ring in order to replace the next sub-conductor. The process is cumbersome and time-consuming.

[0009] In addition, there are some related patent technologies reported, as follows:

[0010] Chinese patent application "Tension Overhead Line Crossing Protection Device and Construction Method for Power Line Fall Prevention" (Patent Application No. 202111039947, Publication Date 2021.11.30) utilizes a tension overhead line crossing protection device to restrict the movement of the power line to be repaired within a certain radius, ensuring a sufficient safe distance between the power line to be repaired and the crossing area, effectively bearing the vertical load of the power line to be repaired, and preventing the power line from falling. The construction method for power line fall prevention involves installing multiple tension overhead line crossing protection devices at intervals above the crossing area to be protected, providing good protection against whiplash and cutting.

[0011] Chinese patent application "A Protective Pulley System for Power Line Renovation and Crossing Construction" (patent application number 202221035310, publication date 2022.09.16) describes a system comprising a plurality of protective pulleys connected in series. This system effectively protects the objects being crossed and offers advantages such as convenient and efficient construction, minimal environmental impact, and low construction costs. Therefore, it is suitable for widespread application in power line renovation and replacement projects. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide a wire sealing and protection device and its usage method that is reasonably designed, simple in structure, lightweight and compact, easy to use and effective.

[0013] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0014] The conductor sealing net protection device mainly includes a fixing frame, sealing rope, and zipline pulley; the fixing frame is in the shape of a straight line, with multiple strong clamps evenly arranged on the fixing frame, and sealing rope fixing rings at both ends of the fixing frame; the sealing rope has safety buckles at both ends that match the sealing rope fixing rings at both ends of the fixing frame; the zipline pulley is installed on the lower surface of the fixing frame.

[0015] The sealing net rope is made of high-strength Dyneema rope.

[0016] The zipline pulley mainly consists of a shaft, a nylon pulley, a fall arrestor, and a thick nut. The fixed end of the shaft and the thick nut are fixed to the lower surface of the fixed frame one in front of the other along the axis of the fixed frame. The nylon pulley is installed on the shaft through the movable end of the shaft via a washer. The fall arrestor is a steel wire rope with fixed rings at both ends. One fixed ring is installed on the outside of the nylon pulley at the movable end of the shaft via a thin nut, and the other fixed ring is installed on the thick nut via a thin nut and a bolt.

[0017] The clamp has an adjusting screw to adjust the opening size, and the inner side of the clamp's jaws is equipped with cushioning rubber.

[0018] The upper surface of the mounting bracket is equipped with a carrying handle, which is made of aluminum alloy profile.

[0019] The mounting bracket is made of high-strength, lightweight profiles with a rectangular cross-section.

[0020] Four pairs of heavy-duty clamps are evenly arranged on the fixing frame, with each pair of two heavy-duty clamps positioned at opposite positions on the front and rear sides of the fixing frame.

[0021] The four pairs of clamps along the fixing frame are, from left to right, clamp #1, clamp #2, clamp #3, and clamp #4.

[0022] The method of using the above-mentioned conductor sealing and protection device includes the following steps:

[0023] (1) Before work, the construction personnel shall use a car or a line to reach a safe position 10 meters away from the object to be crossed by the conductor. A pulley shall be installed on the conductor, and after the suspension rope is threaded, the two ends of the suspension rope shall be slowly lowered to the ground.

[0024] (2) Ground staff pack the wire mesh protection device in an orderly manner, tie it securely, and hang it on one end of the hoisting rope. They then manually pull the other end of the hoisting rope to lift the wire mesh protection device to the construction workers on the wire.

[0025] (3) After receiving the conductor sealing net protection device, the construction personnel unpacked the package one by one, hung the zipline pulley on the outermost sub-conductor, and kept the fixing frame in a suspended state. The conductor sealing net protection device was then easily pushed to the designated position on the conductor through the zipline pulley.

[0026] (4) According to the instructions of the ground personnel, the high-altitude construction personnel shall set up and install a set of wire sealing net protection device every 2-3 meters starting from the designated position;

[0027] (5) First, use the No. 2 and No. 4 strong clamps to firmly clamp the fixing frame onto the corresponding old No. 2 and No. 4 sub-conductors. Then, fasten one end of the sealing rope to the sealing rope fixing ring at one end of the fixing frame, and fasten the other end around the bottom of all the sub-conductors to the sealing rope fixing ring at the other end of the fixing frame. The installation is completed, and the high-altitude construction personnel retreat back to the iron tower.

[0028] (6) Loosen the old #1 sub-conductor and start the traction replacement. After completion, tighten the new conductor to raise it to the same height as the old #2 and #4 sub-conductors. Then replace the old #3 sub-conductor in the same way.

[0029] (7) The high-altitude construction personnel walk out of the conductor again, and use the No. 1 and No. 3 strong clamps to firmly clamp the fixing frame on the corresponding new No. 1 and No. 3 sub-conductors. Then loosen the strong clamps on the old No. 2 and No. 4 sub-conductors. Repeat the above steps until all conductor sealing and protection devices are adjusted. The high-altitude construction personnel return to the iron tower.

[0030] (8) Loosen the old #2 sub-conductor and start the traction replacement. After completion, tighten the new conductor to raise it to the same height as the new #1 and #3 sub-conductors. Then replace the old #4 sub-conductor in the same way until all sub-conductors are replaced.

[0031] (9) The high-altitude construction personnel walked out of the conductor again, loosened the strong clamps of each conductor sealing net protection device one by one, untied the sealing net rope, and slowly lowered the conductor sealing net protection device to the ground to end the construction.

[0032] To address the problems existing in current wire replacement construction netting techniques, the inventors designed a wire netting protection device, mainly comprising a fixing frame, a netting rope, and a zipline pulley. The fixing frame is in a straight line shape, with multiple clamps evenly distributed on it, and netting rope fixing rings at both ends. The netting rope has safety buckles at both ends that match the fixing rings at the ends of the fixing frame. The zipline pulley is detachably connected to the netting rope fixing rings via safety buckles. Based on this, the inventors also developed a corresponding method for using the device.

[0033] Compared with the prior art, the outstanding advantages of the present invention are:

[0034] <1> Using the same phase (pole) sub-conductors as the fixing objects of the sealing net device, there is no need to separately erect a protective net crossing frame above the crossing object; its closed conductor fall protection structure design can keep the conductor within the protection range of the protective net during the conductor replacement construction, playing a reliable safety protection role.

[0035] <2> The replaced conductor can be appropriately relaxed during tension laying and pulling construction, maintaining a lower tension, which significantly reduces the possibility of the conductor being pulled apart and significantly improves construction safety.

[0036] <3> With its simple structure and light weight, it is easy to install, fix, and remove on the sub-conductor, significantly improving construction efficiency and ensuring the safety of the object being crossed.

[0037] <4> Using a cable pulley system, the sealing net device can be suspended on the sub-conductor and slid quickly, easily pushed to the designated position, effectively saving the deployment and installation time of multiple sealing net devices.

[0038] <5> It can be operated by only one person, effectively reducing the number of workers required for high-altitude operations and lowering personal safety risks.

[0039] In summary, this invention features reasonable design, simple structure, lightweight and compact design, ease of use, and good results, making it suitable for widespread application in wire replacement and netting construction. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the wire sealing and protection device of the present invention.

[0041] Figure 2 This is a schematic diagram of the installation status of the wire mesh protection device of the present invention.

[0042] Figure 3 This is a schematic diagram of the installation state of the cable pulley of the wire sealing and protection device in the method of use of the present invention. In the figure: a) cable pulley is placed, b) cable pulley is locked.

[0043] Figure 4 This is a schematic diagram of the installation and arrangement of the wire sealing and protection device in the method of use of the present invention.

[0044] Figure 5 This is a schematic diagram of the replacement of sub-wires #1 and #3 in the method of using this invention.

[0045] Figure 6 This is a schematic diagram of the replacement of sub-wires #2 and #4 in the method of using this invention.

[0046] Figure 7 This is a schematic diagram of the cable pulley structure in the wire mesh protection device of the present invention. In the figure: a is placed horizontally, and b is placed vertically.

[0047] Figure 8 This is a schematic diagram of the assembly of the cable pulley in the conductor sealing and protection device of the present invention.

[0048] In the diagram: 1. Fixing frame; 2. Heavy clamp; 3. Sealing net rope fixing ring; 4. Cable pulley; 5. Safety buckle; 6. Sealing net rope; 7. Hand ring; 8. Sub-conductor #1; 9. Sub-conductor #2; 10. Sub-conductor #3; 11. Sub-conductor #4; 12. Iron tower; 13. Conductor; 14. Conductor sealing net protection device; 15. Pulley; 16. Object to be crossed; 17. Shaft; 18. Washer; 19. Nylon pulley; 20. Thin nut; 21. Fall arrestor rope; 22. Thick nut; 23. Bolt. Detailed Implementation

[0049] I. Basic Structure

[0050] like Figures 1 to 2 As shown, the conductor sealing net protection device of the present invention mainly includes a fixing frame 1, a sealing net rope 6, and a zipline pulley 4, wherein:

[0051] The fixing frame is in a straight line shape and is made of high-strength, lightweight rectangular profiles, effectively ensuring the overall bending and torsional resistance of the ladder while maintaining portability. It possesses sufficient strength to reliably support the conductor in the event of an accidental breakage during cable laying, protecting the safety of the object being crossed. Four pairs of clamps are evenly distributed on the fixing frame, with two clamps 2 in each pair positioned opposite each other on the front and rear sides of the frame; the four pairs of clamps, from left to right, are clamp #1, clamp #2, clamp #3, and clamp #4. The fixing frame has anchoring rings 3 at both ends for securing the sealing net rope. A carrying handle 7 is located on the upper surface of the fixing frame; both ends of the sealing net rope have safety buckles 5 that match the anchoring rings at both ends of the fixing frame; pulleys are installed on the lower surface of the fixing frame.

[0052] The sealing rope is made of high-strength Dyneema rope (as shown in Table 1), which is lightweight and strong. In the event of an accident, it can effectively support the falling conductor and ensure the safety of the object being crossed.

[0053] like Figure 7 and Figure 8As shown, the cableway pulley mainly consists of a rotating shaft 17, a nylon pulley 19, a fall arrestor 21, and a thick nut 22. The pulley is made of nylon to avoid damaging the conductor, and its deep groove design prevents it from easily swaying during operation on the conductor. The fixed end of the rotating shaft and the thick nut are fixed to the lower surface of the fixed frame, one in front and one behind, along the axis of the fixed frame. The fall arrestor is a thin, soft Φ3 steel wire rope with fixed rings at both ends. Using the cableway pulley, workers at height can quickly slide the fixed frame suspended on the conductor during construction, effectively saving installation time. The specific operation is as follows: the nylon pulley is installed on the rotating shaft through the movable end of the rotating shaft via the washer 18. The gap between the washer on both sides of the pulley is slightly larger than the thickness of the pulley, which helps the pulley rotate smoothly; one end of the anti-fall rope is fixedly installed on the outside of the nylon pulley at the movable end of the rotating shaft via the thin nut 20, and the other end of the fixed ring is rotatably installed on the thick nut via the thin nut and the bolt 23. Its function is to prevent the sealing net device from falling off due to excessive sway angle when it moves on the conductor.

[0054] The clamp (as shown in Table 1) has an adjusting screw to adjust the opening size, allowing for quick tightening and loosening of the jaws, improving installation efficiency. It is used to firmly clamp and fix the fixing bracket to the conductor, preventing movement of the fixing bracket during tension stringing and maintaining a reasonable distance from other fixing brackets, thus effectively protecting the conductor. The clamp's jaws have cushioning rubber on the inside to prevent damage to the aluminum conductor.

[0055] The carrying handle is made of aluminum alloy profile to enhance the portability of the mounting bracket.

[0056] Safety buckles (as shown in Table 1) are used to connect the netting ropes. Safety buckles can quickly anchor the netting ropes to the fixing rings, improving construction efficiency.

[0057] Table 1. Market Sources of Some Components of Conductor Sealing and Protection Devices

[0058]

[0059] II. Usage Method

[0060] like Figures 3 to 6 As shown,

[0061] (1) Before work, the construction personnel shall use a car or a line to reach a safe position 10 meters away from the object to be crossed 16 by the wire, install a pulley 15 on the wire, thread the suspension rope, and then slowly lower both ends of the suspension rope to the ground.

[0062] (2) Ground staff pack the wire mesh protection device in an orderly manner, tie it securely, and hang it on one end of the hoisting rope. They then manually pull the other end of the hoisting rope to lift the wire mesh protection device to the construction workers on the wire.

[0063] (3) After receiving the conductor sealing net protection device, the construction personnel unpacked the package one by one, hung the zipline pulley on the outermost sub-conductor, loosened the bolts before the pulley was put into the conductor, and screwed the bolts into the thick nut after the pulley was put into the conductor. In this way, the fixing frame, pulley and anti-fall cable form a closed structure to prevent the sealing net device from falling. This keeps the fixing frame in a suspended state (at this time, the zipline pulley can slide flexibly on the conductor with the conductor sealing net protection device). The conductor sealing net protection device can be easily pushed to the designated position on the conductor through the zipline pulley.

[0064] (4) According to the instructions of the ground personnel, the high-altitude construction personnel shall set up and install a set of wire sealing net protection device every 2-3 meters starting from the designated position;

[0065] (5) First, use the No. 2 and No. 4 strong clamps to firmly clamp the fixing frame onto the corresponding old No. 2 sub-conductor 9 and No. 4 sub-conductor 11. Then, fasten one end of the sealing rope to the sealing rope fixing ring at one end of the fixing frame, and fasten the other end around the bottom of all the sub-conductors to the sealing rope fixing ring at the other end of the fixing frame. The installation is completed, and the high-altitude construction personnel retreat back to the iron tower 12.

[0066] (6) Loosen the old #1 sub-conductor 8 and start the traction replacement. After completion, tighten the new conductor to raise it to the same height as the old #2 and #4 sub-conductors. Then replace the old #3 sub-conductor 10 in the same way.

[0067] (7) The high-altitude construction personnel walk out of the conductor again, and use the No. 1 and No. 3 strong clamps to firmly clamp the fixing frame on the corresponding new No. 1 and No. 3 sub-conductors. Then loosen the strong clamps on the old No. 2 and No. 4 sub-conductors. Repeat the above steps until all conductor sealing and protection devices are adjusted. The high-altitude construction personnel return to the iron tower.

[0068] (8) Loosen the old #2 sub-conductor and start the traction replacement. After completion, tighten the new conductor to raise it to the same height as the new #1 and #3 sub-conductors. Then replace the old #4 sub-conductor in the same way until all sub-conductors are replaced.

[0069] (9) The high-altitude construction personnel walked out of the conductor again, loosened the strong clamps of each conductor sealing net protection device one by one, untied the sealing net rope, and slowly lowered the conductor sealing net protection device to the ground to end the construction.

[0070] In conclusion,

[0071] First, the most significant feature of this invention is its ingenious use of the same-phase (polarity) sub-conductors as the fixing points for the sealing net device, eliminating the need for a separate protective netting frame above the crossing. Compared to open-structure phase-to-phase sealing netting, even if the replaced sub-conductor sways during tensioning, the closed conductor fall protection structure of this invention ensures the sub-conductor remains within the protective netting's range, providing reliable safety. Second, by employing a sealing net rope of appropriate length, the replaced sub-conductor can be appropriately relaxed during tensioning, maintaining a lower tension and significantly reducing the possibility of the old sub-conductor breaking, thus greatly improving construction safety. Furthermore, the use of a cable pulley allows the sealing net device to be suspended on the conductor and slid quickly, easily pushed to the designated position, effectively saving deployment and installation time for multiple sealing net devices. The use of high-pressure clamps allows for rapid installation and removal, significantly improving construction efficiency.

Claims

1. A wire mesh sealing and protection device, characterized in that... The system includes a fixed frame, a netting rope, and a zipline pulley. The fixed frame is in a straight line shape, with multiple high-strength clamps evenly distributed on it. Both ends of the fixed frame have netting rope fixing rings. Both ends of the netting rope have safety buckles that match and connect to the netting rope fixing rings at both ends of the fixed frame. The zipline pulley is installed on the lower surface of the fixed frame. The netting rope is made of high-strength Dyneema rope. The zipline pulley consists of a rotating shaft, a nylon pulley, a fall arrestor, and a thick nut. The fixed end of the rotating shaft and the thick nut are fixed to the lower surface of the fixed frame, one in front of the other, along the axis of the fixed frame. The nylon pulley is installed on the rotating shaft via a washer through the movable end of the rotating shaft. The fall arrestor is a steel wire rope with fixing rings at both ends. One fixing ring is installed on the outside of the nylon pulley at the movable end of the rotating shaft via a thin nut, and the other fixing ring is installed on the thick nut via a thin nut and a bolt.

2. The conductor sealing and protection device according to claim 1, characterized in that: The clamp has an adjusting screw for adjusting the opening size, and the inner side of the clamp's jaws is provided with cushioning rubber.

3. The conductor sealing and protection device according to claim 1, characterized in that: The upper surface of the fixed frame is provided with a carrying handle, which is made of aluminum alloy profile.

4. The conductor sealing and protection device according to claim 1, characterized in that: The fixing frame is made of high-strength, lightweight profiles with a rectangular cross-section.

5. The conductor sealing and protection device according to claim 4, characterized in that: Four pairs of clamps are evenly arranged on the fixing frame, with each pair of two clamps positioned at opposite positions on the front and rear sides of the fixing frame.

6. The conductor sealing and protection device according to claim 5, characterized in that: The four pairs of clamps along the fixing frame are, from left to right, clamp #1, clamp #2, clamp #3, and clamp #4.

7. The method of using the conductor sealing and protection device according to claim 1, characterized in that... Includes the following steps: (1) Before work, the construction personnel shall use a car or walking method to reach a safe position 10 meters away from the object to be crossed, install a pulley on the conductor, thread the suspension rope, and then slowly lower both ends of the suspension rope to the ground. (2) Ground staff pack the conductor sealing net protection device in an orderly manner, tie it securely, and hang it on one end of the hoisting rope. They then manually pull the other end of the hoisting rope to lift the conductor sealing net protection device to the construction personnel on the conductor. (3) After receiving the conductor sealing net protection device, the construction personnel unpacked the package one by one, hung the zipline pulley on the outermost sub-conductor, and kept the fixing frame in a suspended state. The conductor sealing net protection device was then easily pushed to the designated position on the conductor through the zipline pulley. (4) According to the instructions of the ground personnel, the high-altitude construction personnel shall set up and install a set of wire sealing net protection device every 2-3 meters starting from the designated position; (5) First, use the No. 2 and No. 4 strong clamps to firmly clamp the fixing frame onto the corresponding old No. 2 and No. 4 sub-conductors. Then, fasten one end of the sealing rope to the sealing rope fixing ring at one end of the fixing frame, and fasten the other end around the bottom of all the sub-conductors to the sealing rope fixing ring at the other end of the fixing frame. The installation is completed, and the high-altitude construction personnel retreat back to the iron tower. (6) Loosen the old No. 1 sub-conductor and start the traction replacement. After completion, tighten the new conductor to raise it to the same height as the old No. 2 and No. 4 sub-conductors. Then replace the old No. 3 sub-conductor in the same way. (7) The high-altitude construction personnel walk out of the conductor again, and use the No. 1 and No. 3 strong clamps to firmly clamp the fixing frame on the corresponding new No. 1 and No. 3 sub-conductors. Then loosen the strong clamps on the old No. 2 and No. 4 sub-conductors. Repeat the above steps until all conductor sealing and protection devices are adjusted, and the high-altitude construction personnel return to the iron tower. (8) Loosen the old No. 2 sub-conductor and start the traction replacement. After completion, tighten the new conductor to raise it to the same height as the new No. 1 and No. 3 sub-conductors. Then replace the old No. 4 sub-conductor in the same way until all sub-conductors have been replaced. (9) The high-altitude construction personnel walked out of the conductor again, loosened the strong clamps of each conductor sealing net protection device one by one, untied the sealing net rope, and slowly lowered the conductor sealing net protection device to the ground to end the construction.

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