Railway contact network bearing wire replacement construction method
By setting anchor section parameters, designing work vehicle formations, and using constant tension wire laying vehicles for wire laying operations, the problem of unstable replacement of contact wire in traditional construction methods was solved. This enabled safe and stable replacement of the catenary and contact wire, improved the conductivity and fatigue resistance of the contact network, and met the transportation needs of high-speed railways.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-27
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional methods for replacing railway overhead contact line conductors often involve insufficient preparation before the replacement, leading to unstable connections during construction and failing to meet the demands of high-speed railway transportation.
A construction method for replacing railway catenary conductors is adopted, which includes pre-replacement preparation, replacement, and fine-tuning. By setting anchor section parameters, formulating work vehicle grouping, using constant tension wire laying vehicle for pushing and laying operations, and conducting precise testing and adjustments, the stable disassembly and replacement of old and new catenary wires and contact wires is ensured.
It enabled the safe and stable replacement of the catenary and contact wire, ensured the restoration of normal speed during dynamic testing, improved the conductivity and fatigue resistance of the contact network, and met the requirements of high-speed railway transportation.
Smart Images
Figure CN121734196A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of railway construction, and in particular to a construction method for replacing the overhead contact line conductor of a railway. Background Technology
[0002] With the development of high-speed railways, the overhead contact line equipment of high-speed railways is gradually entering a period of major overhaul. Some old railway networks can no longer meet the current needs of railway transportation, and the transformation of existing high-speed railway lines has become an important part of railway construction.
[0003] In the field of high-speed railway overhead contact line replacement, there are a variety of conventional methods. However, traditional construction methods are not adequately prepared before the replacement, which cannot provide a good foundation for the subsequent replacement construction and may lead to problems such as unstable connections during the construction process. Summary of the Invention
[0004] To address the aforementioned issues, this application provides a construction method for replacing the overhead contact line conductor in railway systems.
[0005] The technical solution for replacing the overhead contact line conductor in this application is as follows: A construction method for replacing the overhead contact line conductor in a railway system includes the following steps: S1. Preparations for line replacement; S11. Existing crimp-type electrical connection clamps are dismantled and replaced with bolt-type electrical connection clamps. S12. Temporarily remove the old bomber crane; S13. Conduct a comprehensive measurement of the existing anchor section parameters and the tension of the spring suspension; S14. Divide the anchor section parameters into 30 anchor section support parameters, namely anchor section support No. 1 to anchor section support No. 30. S15. Work vehicle grouping: According to construction needs, the constant tension vehicles are grouped into No. 1 work vehicle, No. 2 line laying vehicle, and No. 3 work vehicle. S16. Develop a work vehicle operation plan and move the work vehicle to the designated anchor section support according to the support of anchor section No. 30. S2, Line Replacement Construction: S21. Replace the catenary; use a constant tension cable laying machine for cable laying operations; select the anchoring and lowering method of the catenary according to the type of anchor joint and anchor the cable after threading it through or temporarily remove the working support for positioning and then lower the cable. S22. Replace the contact wire; use a constant tension wire laying vehicle for wire laying operations; select the anchoring and anchoring method of the contact wire according to the type of anchor joint and anchor the wire through the anchor or temporarily remove the working support for positioning before anchoring. S3, Fine-tuning construction; S31. Overhead contact line fine-tuning; S4, Dynamic inspection resumes normal speed.
[0006] By adopting the above technical solution, and through preparatory work before the line replacement, preparations are made for the environment, materials, and tools required for replacing the entire anchor section's catenary and contact wire. For example, the anchor section parameters are set to divide the anchor section into 30 sections, and the work vehicles are grouped together. The work vehicles move along a specific path to the 30 anchor section supports. The grouped work vehicles strictly follow the anchor section parameters to move to the designated position, ensuring that the work vehicles play their intended role by passing the predetermined anchor section supports. This guarantees the stable disassembly and replacement of the old and new catenary and contact wires during the line replacement construction. After the replacement is completed, fine adjustments are made to the contact wire's spring suspension and droppers, and the acceptance test is ensured to pass the adjustment, so that the dynamic test can stably and safely return to normal speed.
[0007] Optionally, in step S1, the pre-construction preparation stage before line replacement also includes on-site measurement of the existing conductor type, tension, number of anchor weights, and cantilever structure parameters to determine the new conductor laying scheme and tensioning parameters.
[0008] By adopting the above technical solution and measuring and determining these parameters, the laying scheme for the new conductor can be determined, and the required type and quantity of weights can be determined by the tensioning parameters of the anchor weights, ensuring that the tension of the laid conductor meets the requirements during the replacement of the new conductor.
[0009] Optionally, in step 15, the constant tension wire laying vehicles are grouped in the order of No. 1 work vehicle, No. 2 wire laying vehicle and No. 3 work vehicle, with the platform side of No. 2 wire laying vehicle facing the anchoring end of the wire, and the constant tension vehicle is equipped with a straightening device that has been properly adjusted.
[0010] By adopting the above technical solution, the orientation of the No. 2 wire laying vehicle is determined, and the straightness of the contact wire is measured and evaluated using a straightness straightener. This provides accurate detection data for the hard spots, wear, and other conditions of the contact wire, so as to facilitate subsequent adjustment and maintenance work.
[0011] Optionally, in step S21, the step of replacing the catenary is as follows: S211. Enter the blocked area, reach the work site, and verify the grounding; S212, the cable-laying vehicle and ladder truck are in place; S213, Unanchor; S214, Anchoring operation; S215, Catenary cable pushing and laying line; S216, Anchoring operation; S217. Install the new center anchor of the load-bearing cable; S218, Replacement of old and new load-bearing cables; S219. Installation of droppers and electrical connections; S2102, Removal of old catenary cables; S2103, Contact suspension inspection and adjustment.
[0012] By adopting the above technical solution, through steps 211-2103, the grouped work vehicles strictly follow the anchor section parameters to move to the designated position. Work vehicle No. 1 runs to anchor section No. 4 to install temporary guy wires, perform anchor removal, and prepare for anchoring. The middle of the work platform of work vehicle No. 2 is aligned with anchor section No. 6. Work vehicle No. 3 runs to anchor section No. 28 to install temporary guy wires, perform anchor removal, and prepare for anchoring. Then, the following steps are performed: anchoring, pushing and laying the catenary, anchoring, installing the new catenary anchor, replacing the old and new catenary, installing droppers and electrical connections, removing the old catenary, and checking and adjusting the contact suspension. This ensures that the catenary can be replaced safely and stably.
[0013] Optionally, in step S22, replacing the contact wire includes the following steps: S221, Release the anchor; S222, Anchoring operation; S223, Contact wire pusher frame line; S224, Anchoring operation; S225. Install the new contact wire anchor; S226, Switching between old and new contact wires; S227. Removal of old contact wire; S228. Contact suspension inspection and adjustment.
[0014] By adopting the above technical solution, during anchoring, a chain hoist is used to unload and fix the existing contact wire to prevent the weight from shifting. During anchoring, the new contact wire is pulled to the anchoring post for anchoring and fixed on the non-supporting pipe. A constant tension wire laying trolley is used to lay the new contact wire to the anchoring post in one go, with insulated wire laying pulleys used for suspension along the way. During anchoring, the new contact wire is pulled to the anchoring post for anchoring preparation, and a tensioner and chain hoist are used to tighten it. The anchor clamp of the old contact wire is removed, and the wire is installed on the new contact wire. The chain hoist fixing the old contact wire is then released. After the tension is fully unloaded, the wire is broken at the mid-span position near the middle anchor. The old contact wire is slowly lowered to the ground and moved outside the track for disconnection and recovery. Finally, the contact suspension is checked and adjusted, so that the contact wire can be replaced safely and stably.
[0015] Optionally, in step S31, the contact wire fine-tuning includes the following steps: S311, Spring-loaded unloading; S312, Flexible suspension installation; S313, Spring-loaded adjustment.
[0016] By adopting the above technical solutions, and through the material cutting, installation, and adjustment of the overhead contact line, the overall parameters of the contact network can be finely adjusted to ensure that the contact network meets design requirements and operational standards, thereby improving the quality of the contact network.
[0017] Optionally, after the contact wire fine-tuning in step 31, the process also includes S32, crimping the electrical connection clamps.
[0018] By adopting the above technical solutions, the electrical connection clamps of the catenary and contact wires in the catenary are crimped or screwed together, thereby improving the conductivity and fatigue resistance of the catenary and increasing the train's running speed and stability.
[0019] Optionally, step S32, crimping the electrical connection wires, includes the following steps: S321, Grinding and removing oxide layer; S322, Apply electrical compound grease; S323, Installation of the catenary cable electrical connection clamp; S324. Installation of contact wire electrical connection clamps; S325, Electrical connection cable binding.
[0020] By adopting the above technical solution, in the crimping of electrical connection clamps, cleaning the crimping surface, applying conductive grease, binding the catenary cable electrical connection clamps, and tightening the contact wire electrical connection clamps, the crimping and threaded connection of the electrical connection clamps can be ensured to be stable, thereby eliminating contact wire defects, reducing contact wire wear, and extending the contact wire life.
[0021] Optionally, in step S21, the catenary is replaced with a 5KN constant tension line, which is advanced at a fixed line release speed. Line release pulleys are set on the catenary at 10m intervals, and the anchoring end is fixed between the catenary seat of the anchoring support and the double sleeve connector through the line release pulleys.
[0022] By adopting the above technical solution, the directionality of the constant tension car pushing the line is fixed. By releasing the line with constant tension and advancing at a fixed release speed, and in conjunction with the release pulley in the anchor section, the catenary can be replaced stably.
[0023] Optionally, in step S22, the contact wire is replaced with a constant tension of 10kN. During the wire laying process, it is forbidden to stop midway. The starting end controls the twisting of the wire through a stable surface positioner, and the anchoring end achieves tension transmission through a steel wire rope pulley block and a 3T chain hoist.
[0024] By adopting the above technical solution, the tension can be transmitted through the stabilizing positioner of the anchoring section and the steel wire pulley block of the anchoring end, in conjunction with the 3T chain hoist, ensuring the stability of the tension of the contact line during the laying process.
[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Before the line replacement, prepare the environment, materials, and tools for replacing the catenary and contact wire of the entire anchor section. For example, set the anchor section parameters to divide the anchor section into 30 anchor section support parameters, and formulate the work vehicle grouping. The work vehicle will move to the 30 anchor section supports along a specific path. After grouping, the work vehicle will strictly follow the anchor section parameters to move to the designated position. The work vehicle will play its intended role by passing the predetermined anchor section support. This will ensure the stable disassembly and replacement of the old and new catenary and contact wires during the line replacement construction. After the replacement is completed, fine adjustment will be carried out. The spring suspension and dropper of the contact network will be adjusted, and the acceptance test will be qualified after adjustment. This will enable the dynamic test to return to normal speed stably and safely. 2. By measuring and determining these parameters, the laying scheme for the new conductor can be determined, and the required type and quantity of weights can be determined by the tensioning parameters of the anchor weights, ensuring that the tension of the laid conductor meets the requirements during the replacement of the new conductor. 3. Determine the orientation of the No. 2 wire laying vehicle, and use a straightness straightener to measure and evaluate the straightness of the contact wire, so as to provide accurate detection data on the hard spots, wear and other conditions of the contact wire, so as to know the subsequent adjustment and maintenance work. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the planar structure of the work vehicle assembly in one embodiment of this application; Figure 2 This is a schematic diagram of the planar structure of the anchor section support parameters in some embodiments of this application; Detailed Implementation
[0027] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand other advantages and effects of this application from the information disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.
[0028] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.
[0029] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.
[0030] Furthermore, the terms "first" and "second" are used only to indicate an objective and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0031] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.
[0032] The following is in conjunction with the appendix Figure 1 - Appendix Figure 2 This application will be described in further detail below.
[0033] This application discloses a construction method for replacing the overhead contact line conductor in a railway.
[0034] A construction method for replacing the overhead contact line conductor of a railway is applied to the wired reconstruction section of a high-speed railway, belonging to the construction of overhead contact line conductors on an operational high-speed railway.
[0035] Includes the following steps: S1. Preparations for the replacement work include investigating the existing overhead contact line, the cantilever structure, electrical connections, and center anchorage, and obtaining actual data parameters as a basis.
[0036] S2. Replacement work: Replacement work requires dismantling the old catenary and contact wire and replacing them with new catenary and contact wire.
[0037] S3. Fine-tuning construction: Fine-tuning involves adjusting the contact wire's suspension and droppers.
[0038] S4. After dynamic inspection and restoration to normal speed, the replacement of the entire anchor section of the catenary and contact wire is completed, and the train can resume operation. After resumption, the speed shall not exceed 160km / h. After the catenary is adjusted, the train speed shall not exceed 200km / h. After fine adjustment and passing the comprehensive inspection by relevant departments, the normal speed shall be restored. The speed limit in the construction and renovation section shall be 160km / h from the start of the catenary erection to the end of the fine adjustment. After the fine adjustment is completed and the inspection by the inspection vehicle is passed, the normal speed shall be restored in the construction section.
[0039] The preparatory work before the line replacement involves preparing the environment, materials, and tools for replacing the entire anchor section of the catenary and contact wire to ensure stability during the replacement. After the preparation work is completed, the line replacement work is carried out, the old catenary and contact wire are dismantled, and new catenary and contact wire are replaced. After the replacement is completed, fine-tuning is carried out, and the spring suspension and droppers of the contact network are adjusted. After the adjustment, acceptance testing is carried out. If the test is qualified, the system is then tested and restored to normal speed.
[0040] The construction schedule is based on the opening time of railway construction windows, with Class III construction windows lasting 240 minutes and Class II construction windows lasting 290 minutes.
[0041] The first step: Dismantle the existing crimp-type electrical connection clamps and replace them with bolt-type electrical connection clamps. Conduct a comprehensive measurement of the existing anchor section parameters and spring tension.
[0042] The second point: Replace the load-bearing cable, and switch the droppers and electrical connections.
[0043] The third point: Replace the contact wire, and switch the droppers and electrical connections.
[0044] The fourth point: fine-tuning, installing the spring suspension and replacing the suspension cable, crimping the new electrical connection, and adjusting the AB value.
[0045] Point 5: Fine-tuning, comprehensive inspection, defect handling, and final inspection by vehicle.
[0046] The replacement of the catenary wire in the entire anchorage section of the high-speed railway is a Class II closure construction project. According to the construction sequence, the replacement of the catenary wire and the replacement of the contact wire require two Class II closure construction projects, while the remaining construction projects are Class III closure construction projects.
[0047] In step S1, the preparatory work before the line change includes the following steps: S11. Existing crimp-type electrical connectors are dismantled and replaced with bolt-type electrical connectors. Crimped electrical connectors are easy to dismantle and can be easily dismantled, while bolt-type electrical connectors have better overall stability than crimp-type electrical connectors. Bolted electrical connectors are used for the installation of contact wires, while crimp-type electrical connectors can still be used for the catenary.
[0048] S12. Temporarily remove the old suspension cable and replace the two sides of the positioning point with adjustable suspension cables. Then install them during the fine-tuning stage.
[0049] S13. Conduct a comprehensive measurement of the existing anchor section parameters and the tension of the spring suspension. Based on the measured parameters such as distance, height, and spacing, divide the anchor section parameters.
[0050] S14. Divide the anchor section parameters into 30 anchor section support parameters, namely anchor section support No. 1 to anchor section support No. 30. The distance between adjacent anchor section support can be fixed, or an adjustable deviation value within the allowable range can be set based on the fixed distance. This is to adapt to different environments, such as slope, number of obstacles, etc. After dividing the anchor section support from No. 1 to No. 30 into sections, the constant tension vehicle can accurately determine the replacement section, as well as the positions for laying lines and raising anchors, according to the travel position.
[0051] Among them, the number of anchor sections 1 to 30 is not fixed. The number of anchor support columns can be increased or decreased according to the length of the replaced section, but anchor support columns from anchor section 1 to 30 are preferred as the benchmark.
[0052] S15. Work vehicle formation: Based on construction needs, the constant tension vehicles are formed, referring to... Figure 1 As shown, there are three work vehicles: No. 1, No. 2, and No. 3. According to the constant tension vehicle grouping, No. 1, No. 2, and No. 3 work vehicles are moved to the planned anchor sections from No. 1 to No. 30, so as to carry out operations according to the predetermined path and position.
[0053] S16. Develop an operation plan for the work vehicle, referring to... Figure 2 As shown, based on the anchor section support of No. 30, the work vehicle is moved to the designated anchor section support. There are designated planned routes for work vehicle No. 1, line laying vehicle No. 2, and work vehicle No. 3, so that line laying, anchor lifting and other operations can be carried out accurately.
[0054] First, determine the train formation sequence and driving plan of the constant tension car through steps S15-S16. Then, determine the anchoring and threading plan for the new conductor by considering whether the joints at both ends of the anchor section are crossed or open. If the anchoring side of the new line is open, the contact wire can be anchored directly, and the catenary wire needs to be anchored by parallel anchoring and threading. If the anchoring side of the new line is crossed, the catenary wire can be anchored directly, and the contact wire at the joint crossing post is temporarily positioned by removing another one, and the dropper is moved to the anchor post for anchoring.
[0055] The directionality of the constant tension car pushing the cable is fixed, while the arrangement of the anchor section joint on the anchoring side of the up line is a cross-to-open arrangement. Therefore, the anchoring of the up line catenary cable adopts the method of parallel anchoring (temporary anchoring) + cable threading anchoring; the anchoring of the down line contact line on the cross side of the anchor section joint adopts the method of temporarily removing the positioning clamp, dropper and electrical connection of another branch (working branch) and then moving it to the anchor post for anchoring.
[0056] In step S2, the line replacement work includes the following steps: S21. Replace the catenary; use a constant tension cable laying machine for cable laying operations; select the anchoring and lowering method of the catenary according to the type of anchor joint and anchor the cable after threading it through the anchor or temporarily remove the working support for positioning and then lower the anchor.
[0057] In S21, replacing the catenary cable includes the following steps: S211. Enter the blocked area, reach the work site, and verify the grounding; S212, the cable-laying vehicle group and ladder truck arrived at their positions. After the cable-laying vehicle group disengaged at anchor section 6, work vehicle No. 1 moved to anchor section 4 to perform temporary guy wire installation, anchor removal, and preparation for anchoring; the middle of the work platform of cable-laying vehicle No. 2 was aligned with anchor section 6; work vehicle No. 3 moved to anchor section 28 to perform temporary guy wire installation, anchor removal, and preparation for anchoring.
[0058] S213. Unanchoring: The 2m hoisting sling is installed above the anchoring angle steel of anchor section 4 and anchor section 28, and connected to a 3T chain hoist. The other end of the hoist is connected to a tensioner installed 2m in front of the lower anchor insulator. The existing catenary is unloaded by operating the 3T chain hoist, and the rigid anchor is fixed to the support. The force on the 3T chain hoist should be such that the weight drops slightly downwards.
[0059] Then, a 1.5T chain hoist and a 0.6m lifting sling were used to fix the catenary weight string to the ratchet base. The 1.5T chain hoist was tightened to loosen the ratchet compensation rope, so that the ratchet was locked onto the stop block. The existing catenary end was removed to make room for the new catenary lifting anchor.
[0060] At the same time, a large rope is used to fix the contact wire compensation weight to the lower base of the compensation limiting frame to prevent the contact wire from moving.
[0061] S214. Anchoring Operation: The line-laying team will flip the new catenary cable end head over the existing catenary cable at anchor section 6 and hand it over to the anchoring team to pull it to anchor section 4 for anchoring. At the same time, a line-laying pulley will be installed between the catenary cable seat and the double-sleeve connector at anchor section 6 to secure the new catenary cable.
[0062] S215, the catenary cable is pushed and laid out; after the anchor of anchor section 4 is lifted, the constant tension cable laying vehicle pushes and lays the cable in the direction of the larger diameter at anchor section 6.
[0063] When the cable reaches the positioning point, stop the car and use the cable pulling device to fix the catenary cable. Use a φ10 Nilen rope loop + insulated cable release pulley to suspend the catenary cable seat and double sleeve connector for secure fixation. When the catenary cable is erected past the reverse positioning point, disconnect the positioning tube suspension line from the positioning tube end in advance and temporarily fix it with a 2m oil rope to make room for the new catenary cable. When the suspension is adjusted, restore the positioning tube suspension line.
[0064] During the stringing process, each ladder truck group will pour out the existing catenary from the catenary seat and fix it between the catenary seat and the double sleeve connector on the horizontal cantilever. Protective measures must be taken for the horizontal cantilever to prevent damage to the protective layer on the surface of the cantilever.
[0065] When the No. 3 work vehicle is pushed to the No. 20 transition post, the new and old catenary cables are anchored together using slings in the middle of the span between the No. 20 and No. 22 anchor sections. The No. 3 work vehicle group continues to push the cable to the No. 28 anchor section post for the cable breakage procedure, without suspending the cable-laying pulleys during this process.
[0066] S216, Anchoring Operation: After the No. 3 work vehicle breaks the line, the adjacent ladder truck work group assists the anchoring operation group in pulling the new catenary cable end back to the No. 20 anchor section support, crossing the non-support contact line, and pulling it along the existing catenary cable route to the No. 28 anchor section support for anchoring preparation. At the same time, the new catenary cable is securely suspended between the catenary cable seat and the double sleeve connector of the No. 20, No. 22, No. 24, and No. 26 anchor sections using a nylon sleeve and a line-laying pulley.
[0067] During anchoring, the new catenary is secured to the wire rope pulley block using a tensioner. Subsequently, the adjacent ladder truck working group assists the anchoring group in tightening the tail rope of the pulley block, extending it to a 3T chain hoist fixed at the bottom of the support column of anchor section 26. The 3T chain hoist is then operated to tighten the new catenary until the weight at the anchoring end moves upward and the weight string is fully stressed, stopping the tensioning.
[0068] The No. 2 cable laying vehicle fabricated a new catenary cable terminal on the work vehicle platform and connected it to the anchor insulator. Finally, the pulley block, the No. 20 anchor section support, and the anchor lock were removed, and the anchoring operation was completed.
[0069] S217. Install the new center anchor of the catenary; invert the old center anchor clamp of the catenary that was removed in advance onto the new catenary.
[0070] S218, Replacement of old and new catenary cables; After the installation of the central anchor is completed, each work group installs the new catenary cable into the catenary cable seat according to the installation curve requirements, and at the same time installs and secures the copper-aluminum transition protective pad.
[0071] S219. Installation of droppers and electrical connections, and replacement of droppers and electrical connections.
[0072] S2102. Removal of the old catenary cable: After all components on the old catenary cable have been removed and replaced, the anchor-lifting team simultaneously loosens the 3T chain hoist of the old catenary cable to unload it. After full unloading, the cable is secured to the pulley block near the mid-span of the central anchor using a tensioner before being cut. After the old catenary cable breaks, the pulley block is slowly loosened to allow both ends to fall to the ground. Each work team uses a rope to slowly lower the old catenary cable to the ground and moves the cable outside the track for easy breaking and retrieval. After the ladder truck team completes its work, it cooperates with the retrieval teams to recover the old catenary cable.
[0073] S2103. Contact suspension inspection and adjustment: After the old catenary cables are dismantled, each work group should promptly measure the contact network parameters and immediately adjust any parameters that do not meet the standards. After the parameters are verified and adjusted, each work group should conduct another top-down inspection, focusing on checking the operating status of all parts, compensation devices, electrical connections, and other equipment on the new catenary cables.
[0074] Through steps 211-2103, the grouped work vehicles strictly follow the anchor section parameters to move to the designated positions. Work vehicle No. 1 moves to anchor section No. 4 to install temporary guy wires, perform anchor removal, and prepare for anchoring. Work vehicle No. 2 aligns its platform with anchor section No. 6. Work vehicle No. 3 moves to anchor section No. 28 to install temporary guy wires, perform anchor removal, and prepare for anchoring. Then, the following steps are performed: anchoring, pushing and laying the catenary cable, anchoring, installing the new catenary cable anchor, replacing the old and new catenary cables, installing droppers and electrical connections, removing the old catenary cable, and checking and adjusting the contact suspension. This ensures that the catenary cable can be replaced safely and stably.
[0075] In step S21, the catenary replacement uses a constant tension of 5KN and is advanced at a fixed speed, such as 3km / h. The catenary pulleys are set on the catenary at 10m intervals, and the anchoring end is fixed between the catenary seat of the anchoring support and the double sleeve connector through the catenary pulleys. The directionality of the catenary being pushed by the constant tension cart is fixed. By using constant tension catenary and advancing at a fixed speed, and in conjunction with the catenary pulleys in the anchoring section, the catenary can be replaced stably.
[0076] S22. Replace the contact wire; use a constant tension wire laying vehicle for wire laying operations; the method of anchoring and lowering the contact wire is selected according to the type of anchor joint and the anchor is laid down after the anchor is threaded through or after the working support is temporarily removed and positioned. The contact wire replacement operation adopts the constant tension wire laying vehicle pushing method for wire replacement operations, and the wire laying direction and wire laying vehicle group are consistent with the catenary.
[0077] In S22, replacing the contact wire includes the following steps: S221. Unanchoring: The 3m hoisting sling is installed on the support column of anchor section 4 and above the anchor angle steel of anchor column 28, and connected to a 3T chain hoist. The other end of the hoist is connected to the tensioner installed 2m in front of the lower anchor insulator. The existing contact wire is unloaded by operating the 3T chain hoist, and the hard anchor is fixed on the support column. The 3T chain hoist is tightened until the chain is straight, and the hoist is only slightly stressed.
[0078] Subsequently, a 1.5T chain hoist and a 0.6m lifting sling were used to fix the contact wire weight onto the ratchet base.
[0079] Tighten the 1.5T chain hoist to loosen the ratchet compensation rope, allowing the ratchet to lock onto the stop block, and remove the old contact wire end.
[0080] At the same time, a large rope is used to fix the contact wire compensation weight to the lower base of the compensation limiting frame to prevent the contact wire from moving when tensioning the wire.
[0081] S222, Anchoring Operation: The laying-out team flips the new contact wire end over the existing contact wire at anchor section 6 and hands it over to the anchoring team to be pulled to anchor section 4 for anchoring. Simultaneously, the new contact wire is secured to the non-support positioning pipe of anchor section 6 using the laying-out pulley. To prevent conductor twisting at the non-support anchoring point, the laying-out team controls the wire end and pulls it out, then hands it over to the anchoring team. The anchoring team installs two positioning devices distributed on both sides of the conductor near the end clamp. The tail of the positioning devices is fixed to the catenary cable with a V-shaped guy wire. After the conductor is under full tension, the stabilizing positioning devices are removed. The anchoring point is also treated with stabilizing measures to prevent conductor twisting under load.
[0082] S223. Contact wire laying: After the anchoring of anchor section 4 is completed, the constant tension laying vehicle will lay the new contact wire towards the larger direction at anchor section 6. An insulated laying pulley will be installed every 10 meters along the route to suspend the new contact wire on the old contact wire. The laying vehicle will operate at a constant speed during the laying process, laying the wire in one go without stopping. The speed will be a constant 3 km / h, and the laying tension will be 10 kN.
[0083] S224. Anchoring Operation: During the anchoring operation, when the No. 3 work vehicle is pushed to anchor post No. 28, with the middle of the work platform directly facing the anchor insulator of anchor section No. 28, the constant tension wire laying vehicle's wire-pulling arm is used to bring the contact wire as close as possible to the anchor insulator in preparation for anchoring. During anchoring, the new contact wire is fixed to the wire rope pulley block using a tensioner. Subsequently, the adjacent ladder truck work group assists the anchoring group in tightening the tail rope of the pulley block, extending it to the 3T chain hoist fixed at the bottom of anchor section No. 26. The 3T chain hoist is operated to tighten the new contact wire until the weight at the anchoring end moves upward, and the weight string is fully stressed, stopping the tensioning.
[0084] The No. 2 wire-laying vehicle fabricated a new contact wire terminal on the work vehicle platform and connected it to the anchor insulator. Finally, the pulley block was removed, and the anchoring operation was completed.
[0085] S225. Install the new contact wire anchor, remove the old contact wire anchor clamp, and invert it onto the new contact wire. At the same time, each work group should check the contact wire working surface in turn, starting from the anchor clamp and moving towards both sides of the anchor.
[0086] S226. When switching between old and new contact lines, after each ladder car group confirms the working surface of the contact line from the direction of the central anchor, the working surface must be handed over to the next group before the switch between old and new lines can be carried out. First, switch the positioning, and then switch the droppers and electrical connections. After the droppers are switched, use a 2m oil rope + a line-laying pulley to temporarily suspend the old contact line on the catenary. The old contact line should be 200mm lower than the new line.
[0087] S227. Removal of the old contact wire: After all components on the old contact wire have been removed and replaced, the anchor lifting and lowering team releases the 3T chain hoist securing the old contact wire. Once the tension is fully released, the old wire is stabilized near the mid-span of the central anchor using a tensioner and pulley system before being cut. The pulley system is then slowly released until both ends of the old contact wire reach the ground. Each work team uses a rope to slowly lower the old contact wire to the ground and move it outside the track before disconnecting and retrieving it. After the ladder truck team completes its work, it coordinates with the retrieval teams to recover the old contact wire.
[0088] S228. Contact line inspection and adjustment: After the old contact line is dismantled, each work group should promptly measure the contact line parameters. Any parameters that do not meet the standards should be adjusted immediately, and the final measurement data should be recorded and archived. After the parameters are verified and adjusted, each work group should conduct another top-down inspection, focusing on checking the operating status of various parts, compensation devices, electrical connections, and other equipment on the new contact line.
[0089] In steps 221-228, during anchoring, a chain hoist is used to unload and secure the existing contact wire to prevent the weight from shifting. During anchoring, the new contact wire is pulled to the anchor post for anchoring and secured to the non-supporting pipe. A constant tension wire laying trolley is used to lay the new contact wire to the anchor post in one go, with insulated wire laying pulleys used for suspension along the way. During anchoring, the new contact wire is pulled to the anchor post for anchoring preparation and tightened using a tensioner and chain hoist. The anchor clamp in the old contact wire is removed, and the wire is inverted and installed on the new contact wire. The chain hoist securing the old contact wire is then released. After the tension is fully unloaded, the wire is broken at the mid-span position near the anchor. The old contact wire is slowly lowered to the ground and moved outside the track for disconnection and retrieval. Finally, the contact suspension is checked and adjusted to ensure that the contact wire can be replaced safely and stably.
[0090] In step S22, the contact wire is replaced with a constant tension of 10kN. Stopping is prohibited during the wire laying process. The anchoring end controls the wire twisting through a surface stabilizer, and the anchoring end uses a wire rope pulley block and a 3T chain hoist to achieve tension transmission. Through the surface stabilizer at the anchoring section and the wire rope pulley block at the anchoring end, in conjunction with the 3T chain hoist, tension transmission can be achieved, ensuring the stability of the contact wire tension during the wire laying process.
[0091] In step S3, the fine-tuning construction includes the following steps: S31. Fine-tuning of the contact wire: The contact wire can be a fully compensated elastic chain suspension. The tension of the elastic sling is determined according to the requirements. In this embodiment, the preset value is 2.8KN. The wire and tension combination can be JTMH120 (20KN) + CTMH150 (25KN). The contact wire height is 5300mm for example, and the structural height is 1600mm for example.
[0092] The catenary cantilever support is made of aluminum alloy. During the replacement of the catenary cable, the old catenary cable is emptied out of the catenary cable seat and placed on the flat cantilever arm, with protective rubber pads used. The reverse positioning tube is temporarily fixed with Φ10 nylon soft rope. The suspension pulley is wrapped with soft rope or iron wire in plastic tube. The iron S-hook is wrapped with plastic tube, etc. The line laying pulley is fixed with nylon rope between the catenary cable seat and the sleeve seat to protect the existing catenary components from damage.
[0093] S32. Electrical connection wire clamp crimping: After the catenary wire or contact wire is replaced, the electrical connection wire needs to be re-clamped and maintenance procedures need to be performed.
[0094] The fine-tuning of the overhead contact system includes: S311, Spring-loaded unloading; In the pre-assembly workshop, cut the elastic sling rope to 18m + 20cm intervals. The elastic sling rope is made of 35mm² bronze stranded wire. Mark the middle of the total length of the elastic sling rope. Secure the ends and the 170mm mark with tape.
[0095] S312, Flexible suspension installation; The installation of the flexible slings should begin from the center anchor point and proceed towards both sides in the downward anchoring direction. Only two work teams are allowed to install one anchor section. When installing the flexible slings, the slings should be bisected at the suspension point, with the center position mark of the flexible sling aligned with the center of the cantilever tube, allowing a 20mm allowable deviation. The 200mm longer end of the flexible sling should face downward anchoring.
[0096] The elastic sling is designed to have a tension of 3.5 kN. A special elastic sling tensioner must be used to adjust the tension of the elastic sling to the design value.
[0097] The bolts of the elastic sling clamps should be inserted from top to bottom, ensuring that the shorter bolts are on the line side and the longer bolts are on the field side. The tightening torque is 23 N·m, and all anti-loosening washers should be bent towards the nut side. The elastic sling clamp at the lower anchoring end should be exposed with a 30mm outer edge; the clamp at the middle anchoring end should be exposed with a 170mm outer edge.
[0098] The height difference between the conductor of the first suspension cable in the middle of the span and the adjacent elastic suspension cable suspension cable must be less than 10mm; the height of the conductor of the elastic suspension cable suspension cable and the positioning clamp should be equal, and there should be no “V” shaped conductor height. The construction error should not exceed ±5mm.
[0099] S313, Spring-loaded adjustment.
[0100] After completing the adjustment of two or more sets of elastic slings and the overall suspension of two or more spans, perform elastic sling adjustment and check for negative and positive sag of the contact line at the mid-span.
[0101] By adjusting the tension of the spring suspension, the height difference of the contact line at adjacent suspension points should not exceed 5mm. The height difference of the contact line at adjacent positioning points should not exceed 10mm, and the contact line height should meet the standard with an error of ±20mm.
[0102] By marking the material unloading of the flexible contact wire, determining the installation point using the markings, and adjusting the tension of the flexible contact wire, the overall parameters of the contact network can be finely adjusted to ensure that the contact network meets design requirements and operational standards, thereby improving the quality of the contact network.
[0103] In step S32, the crimping of the electrical connection clamp includes the following steps: S321. Grinding and removing oxide layer: The contact wires, catenary wires, electrical connection clamps, and middle clamping plates at the crimping joints must be sanded to remove the oxide layer, and the sanding powder and debris should be cleaned with a soft brush. The cleaned surface should have a metallic sheen, ensuring the crimping area is clean.
[0104] S322. Apply electrical composite grease; apply a thin, even layer (approximately 0.2 mm thick) of electrical composite grease to the crimping locations of the catenary wire and contact wire, as well as the inner surface of the clamp and the curved surface of the middle clamp plate. Crimping should be performed as soon as possible after applying the conductive grease; it should not be left in the air for an extended period, otherwise the conductive metal base elements in the grease will oxidize, affecting the electrical performance of the electrical connection clamp. Generally, the conductive grease should not be exposed to air for more than 30 minutes.
[0105] S323. Installation of catenary cable electrical connector clamps: The installation principle is as follows: the smaller diameter cable is installed on the short side of the clamp body (with groove markings), and the larger diameter cable is installed on the long side of the clamp body (without groove markings). However, when the diameters of the catenary cable and the electrical connector are similar, the catenary cable should be installed on the long side of the clamp, and the electrical connector on the short side. For example, when connecting TJR95 and JTMH120, JTMH120 should be installed on the long side, and TJR95 on the short side. The opening directions of the catenary cable electrical connector clamps for the up and down lines should be opposite. Before crimping the electrical connection, prepare a 140-150mm long single wire of the electrical connector for binding the end of the electrical connector to prevent the wire from unraveling.
[0106] S324. Installation of contact wire electrical connection clamps: The threaded clip inside the contact wire electrical connection clamp must be within the contact wire groove. After crimping, ensure that the threaded clip protrudes 1-3mm from the clamp body, and the end of the electrical connection wire protrudes approximately 10-20mm from the clamp body. The ring of the threaded clip should face the direction of train travel. The end of the electrical connection wire at the contact wire electrical connection clamp should face the opposite direction of train travel.
[0107] S325. Electrical connection wire binding: Electrical connection wire clamp binding (the binding wire is the same as the catenary wire), the edge of the clamp is 100mm away from the binding wire, and the binding length is 50mm.
[0108] In the crimping of electrical connector clamps, the crimping surfaces are cleaned, conductive grease is applied, the catenary cable electrical connector clamps are tied, and the contact wire electrical connector clamps are tightened to ensure stable crimping and threaded connection of the electrical connector clamps. This can eliminate contact wire defects, reduce contact wire wear, and extend the service life of the contact wire.
[0109] In some embodiments, in step S1, the pre-construction preparation stage before line replacement also includes on-site measurement of the existing conductor type, tension, number of anchor weights, and cantilever structure parameters to determine the new conductor laying scheme and tensioning parameters. By measuring and determining these parameters, the new conductor laying scheme can be determined, and the required weight type and quantity can be determined by the anchoring parameters, ensuring that the tension of the laid conductor meets the requirements during the replacement of the new conductor.
[0110] Furthermore, in step 15, the constant tension wire laying vehicles are grouped in the order of No. 1 work vehicle, No. 2 wire laying vehicle, and No. 3 work vehicle, with the platform side of No. 2 wire laying vehicle facing the anchoring end of the wire, which can also be understood as the low mileage side. The constant tension vehicle is equipped with a qualified straightening device, which allows the straightness of the contact wire to be measured and evaluated, providing accurate detection data for the hard spots, wear, and other conditions of the contact wire, so as to know the subsequent adjustment and maintenance work.
[0111] Among these, safety measures during the replacement process must be strictly implemented in accordance with relevant regulations to ensure the safety of the overall replacement construction.
[0112] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A construction method for replacing a catenary conductor of a railway overhead line system, characterized in that It comprises the following steps: S1, preparation before line replacement; S11, disassemble the existing pressure contact electric connection clamp and replace it with a bolt type electric connection clamp; S12, temporarily remove the old suspension; S13, comprehensively measure the parameters of the existing anchor section and the tension of the suspension; S14, divide the anchor section parameters into 30 anchor section support parameters, respectively, No. 1 anchor section support to No. 30 anchor section support; S15, work car marshalling: according to the construction requirements, the constant tension car is marshalled, respectively, No. 1 work car, No. 2 pay-off car and No. 3 work car; S16, develop a work car operation plan, according to No. 30 anchor section support, move the work car to the designated anchor section support; S2, line replacement construction: S21, replace the load-bearing cable; use the constant tension pay-off car to perform the push pay-off operation; the load-bearing cable anchoring and anchoring mode is selected according to the anchor section joint type and anchored through the line and anchored or temporarily removed after positioning the working support and anchored; S22, replace the contact wire; use the constant tension pay-off car to perform the push pay-off operation; the load-bearing cable anchoring and anchoring mode is selected according to the anchor section joint type and anchored through the line and anchored or temporarily removed after positioning the working support and anchored; S3, fine adjustment construction; S31, contact net fine adjustment; S4, dynamic inspection and recovery of normal speed.
2. The method according to claim 1, wherein In step S1, the preparation before line replacement construction stage also includes on-site measurement of the existing load-bearing wire type, tension, number of anchor sinkers and wrist arm structure parameters to determine the pay-off scheme and tight line parameters of the new load-bearing wire.
3. The method according to claim 1, wherein the method is characterized by, In step 15, the marshalling sequence of the constant tension pay-off car is No. 1 work car, No. 2 pay-off car and No. 3 work car, and the platform side of No. 2 pay-off car faces the cable anchor end, and the constant tension car is equipped with a qualified flatness corrector.
4. The method according to claim 1, wherein, In step S21, the steps for replacing the load-bearing cable are: S211, enter the blocked interval, reach the work site, and check the electricity grounding; S212, pay-off car group, ladder car in place; S213, disassemble the anchor; S214, anchor lifting operation; S215, load-bearing cable push pay-off; S216, anchoring operation; S217, installation of new load-bearing cable anchor; S218, new and old load-bearing cable replacement; S219, installation of suspension and electrical connection; S2102, removal of old load-bearing cable; S2103, contact suspension inspection and adjustment.
5. The method according to claim 1, wherein the method is characterized by, In step S22, replacing the contact wire comprises the following steps: S221, disassemble the anchor; S222, anchor lifting operation; S223, contact wire push pay-off; S224, anchoring operation; S225, installation of new contact wire anchor; S226, new and old contact wire replacement; S227, removal of old contact wire; S228, contact suspension inspection and adjustment.
6. The method according to claim 1, wherein the method is characterized by, In step S31, contact net fine adjustment comprises the following steps: S311, suspension feeding; S312, suspension installation; S313, suspension adjustment.
7. The method according to claim 1, wherein the method is characterized by, In step 31, after the contact net fine adjustment, it also includes S32, electrical connection clamp pressure connection.
8. The method according to claim 1, wherein the method is characterized by, Step S32, electrical connection line pressure connection comprises the following steps: S321, polishing and removing the oxide layer; S322, applying electrical power composite grease; S323, installation of load-bearing cable electrical connection clamp; S324, installation of contact wire electrical connection clamp; S325, electrical connection line binding.
9. The method according to claim 1, wherein the method is characterized by, In step S21, the load cable replacement adopts 5KN constant tension pay-off to advance at a fixed pay-off speed. The pay-off pulleys are arranged on the load cable at intervals of 10m, and the anchor end is fixed between the load cable seat of the anchor support pillar and the double casing connector through the pay-off pulley.
10. The method according to claim 1, wherein the method is characterized by, In step S22, the contact line replacement adopts 10kN constant tension pay-off. Parking is prohibited during the pay-off process. The anchor end is controlled by the stabilizing surface positioner to control the wire twisting, and the anchor end is controlled by the steel wire rope pulley group and 3T chain hoist to realize tension transmission.