A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system for passenger transport lines.

Abstract

This is a construction method that involves simultaneously replacing the entire catenary and contact wires in the anchor section of the overhead contact system for passenger transport lines. [Solution] The construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system for passenger transport lines includes pre-construction preparation, mounting wires on the anchor lifting side, replacing the compensation device, lowering the anchors of the catenary and contact wires, removing the old wires, installing droppers and electrical connection wires, and adjusting the overhead contact system. The present invention is a construction method in which the new contact wires are erected first, followed by the erection of the new catenary wires, and through rationally designed technical steps in the erection process, the tension of the existing struts and existing guy wire foundations is always kept within their load range, thereby increasing construction efficiency, saving construction skylights, and ensuring the safety of wire replacement work.

Description

Technical Field

[0001] This application relates to the technical field of the construction of the overhead contact system for electrified railways. Specifically, it is a construction method (construction method for simultaneously replacing catenary and contact wires of entire anchor section of overhead contact system of passenger-dedicated line) for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system.

Background Art

[0002] The electrified railways in China have developed rapidly, and the technical level has been continuously improved. The technical standards of the electrified railways completed earlier are relatively lagging, and the equipment has deteriorated over time and has entered the period of major overhaul. However, the major overhaul of the overhead contact system is mainly a wire replacement construction carried out to improve the standards of the catenary wire, messenger wire, and contact wire.

[0003] There are two common wire replacement methods: single wire replacement and simultaneous replacement of catenary and contact wires (catenary wire and contact wire). Single wire replacement involves replacing the catenary wire at one skylight, then the contact wire at the next skylight, completing the replacement of one anchor section wire at two skylights, which is not highly efficient. Simultaneous replacement of catenary and contact wires usually employs simultaneous deployment of the catenary and contact wires, removing (dismantling) the existing old catenary and contact wires before lowering the anchors, and then lowering the new wires. This method allows for simultaneous replacement of catenary and contact wires at one skylight, but does not employ constant tension wire delivery construction techniques. Based on the "High-Speed ​​Rail Power Traction and Supply Construction Quality Acceptance Standards" and the requirements of the relevant equipment management departments, it is now necessary to use constant tension wire delivery for the installation of overhead contact systems. On the other hand, if constant tension wire delivery is not adopted, the quality of contact wire deployment cannot be guaranteed, and quality problems such as twisted contact wires, hard point formation, and surface scratches are likely to occur.

[0004] Cables (wires) are under tension, and during the installation process of catenaries and contact wires, new and old catenaries and contact wires may be present simultaneously, potentially causing strut overload and breakage. Guy wires (wire tensioners) are installed to stabilize struts, balancing the tensile forces in each direction of the strut and preventing bending or tilting. During the replacement process of catenaries and contact wires, auxiliary ropes are usually added to reinforce the struts to stabilize them and protect against the risk of increased tension. However, if additional guy wires are secured to the existing guy wire foundation, a safety risk arises due to overloading of the guy wire foundation.

[0005] Therefore, it is necessary to provide an improved technical proposal that addresses the shortcomings of the conventional technology described above. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The purpose of this application is to overcome the shortcomings of the prior art described above, and this application provides a construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system for passenger transport lines. [Means for solving the problem]

[0007] To achieve the above objective, this application provides the following technical solution.

[0008] Step S1, which is the preliminary preparation for construction, involves assembling railcars and placing catenary wire wire reels and contact wire wire reels on the assembled railcar group. Two sets of auxiliary ropes (auxiliary cords) are attached to the anchor starting side, and the old catenary and contact wires are then pulled down (tilted) and secured to the guy wire foundation via the auxiliary ropes. The auxiliary ropes are used to tighten the old catenary and contact wires and to loosen the compensating devices of the old catenary and contact wires. At the same time, a lever hoist is used to pull up the old weight string and weight rope, and then the old weight string is removed. The anchor lowering side is performed simultaneously with the anchor starting side, and the construction method is the same as the anchor starting side. If necessary, a wire payoff pulley is installed below the catenary wire support clamp on the horizontal arm. Step S2 involves setting up a pulley to prepare for the deployment and attachment of the catenary wire, the new contact wire being pulled up using a temporary rigid anchor in the track assembly, the new contact wire being deployed, the new contact wire being attached to the old catenary wire using a special S-hook, the temporary anchoring of the new catenary wire being performed, the anchoring method being the same as for the new contact wire being attached, the new catenary wire being deployed, the new catenary wire being attached to the catenary wire support clamp of the horizontal arm using a wire delivery pulley, and then the wire being routed on the anchoring side (pulling up the anchor and routing the wire). Step S3 involves replacing the compensating devices, which are then used to complete the formal anchor lifting process. This involves removing the old compensating devices, anchor angle steel, and limiting frames from both the anchor lifting and anchor lowering sides, where the tension has already been reduced (released), and installing new anchor angle steel, limiting frames, compensating devices, and weight strings for the new catenary and contact wires. The new contact wire is then lowered into the new compensating device on the anchor lifting side to complete the formal anchor lifting, and finally the new catenary wire is lowered into the new compensating device on the anchor lifting side to complete the formal anchor lifting. After replacing the compensating device, the new contact wire anchor is lowered. However, before lowering the anchor, the tension of the old contact wire is reduced by a lever hoist on the auxiliary rope, and the track assembly tightens the wire to adjust the anchor lowering tension to 15KN. After the new contact wire is connected to the new compensating device on the anchor lowering side, the new catenary wire anchor is lowered. After the lowering of the new catenary and contact wire anchors is complete, the new catenary wire is pulled down to the catenary wire support clamp, and the special S-hook to which the new contact wire is attached is pulled down to the new catenary wire. This is step S4 of lowering the catenary and contact wire anchors. After the new catenary and contact wires have been lowered, the old wires are disconnected at the middle anchor, and the old catenary and contact wires are slowly lowered using a large rope, in step S5, to remove the old wires. Step S6 involves installing the dropper and electrical connection wires and adjusting the overhead contact system. A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system (contact network) of a passenger transport line, including, In step S2, when attaching the auxiliary ropes, one guide pulley is attached to the field side of the anchor angle steel of the old catenary and contact wire. One end of each of the two auxiliary ropes passes through the two guide pulleys and connects to the lever hoist, the other end of the lever hoist is connected to the guy wire foundation, and the other end of the auxiliary ropes is connected to the old catenary and contact wire using a wire gripper (device for tightening the wire). This is a construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system for passenger transport lines. Beneficial effects

[0009] This invention proposes a construction method for major repairs of passenger overhead contact systems in which new wires are installed first, the old wires are removed, and the catenary wires and contact wires are replaced within the same construction skylight. However, the construction method employs a constant tension wire installation vehicle for the contact wires and a low tension installation vehicle for the catenary wires, and involves installing the new contact wires first, followed by the new catenary wires. Furthermore, through rationally designed technical steps in the installation process, the tension of the existing struts and guy wire foundations is always kept within their load range, thereby increasing construction efficiency, saving construction skylights, and ensuring the safety of the wire replacement work. [Brief explanation of the drawing]

[0010] [Figure 1] This is a construction process flow chart. [Figure 2] This is a plan view of the wire replacement mechanism according to the present embodiment. [Figure 3] This is a schematic diagram of the train configuration of the railcar according to the present embodiment. [Figure 4] This is a schematic diagram illustrating the connection between the auxiliary rope and the old catenary or contact wire in this embodiment of the present invention. [Figure 5] This is a schematic diagram of the configuration of the special S-hook according to the embodiment of the present invention. [Modes for carrying out the invention]

[0011] "Catenary wire" and "contact wire" are conventional general terms in this field for catenary wire and contact wire, respectively. In this text, "catenary wire" and "contact wire" refer to catenary wire and contact wire, respectively, when there is no need to distinguish between them.

[0012] As shown in Figure 1, the construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system for passenger transport lines includes the following steps S1 to S6.

[0013] Step S1, the preliminary preparation for construction, includes site surveys, measurement of dropper prefabricated data, confirmation of openings for anchor lifting and lowering, clarification of wire routing plans, assembly of railcars, and inspection of wire reels. The assembled railcars are fitted with catenary wire reels and contact wire reels. However, following the principle that the contact wires are erected before the catenary wires, the railcars are assembled as follows: constant tension wire feeder (front) + work vehicle (work vehicle) + catenary wire feeder + work vehicle (rear). Figure 3 is a schematic diagram of the railcar assembly.

[0014] In step S2, where a wire is installed on the anchor lifting side, As shown in Figure 4, two sets of auxiliary ropes 1 are attached to the anchor lifting side, and the old catenary and contact wires 2 are then pulled down and fixed to the guy wire foundation 8 via the auxiliary ropes 1. The old catenary and contact wires 2 are tightened using the auxiliary ropes 1, and the compensating devices of the old catenary and contact wires are loosened. At the same time, the old weight string 5 is lifted using one lever hoist and then removed. In Figure 4 at this time, the weight string refers to the old weight string 5 (existing weight string). The anchor lowering side is performed simultaneously with the anchor lifting side, and the construction method is the same as the anchor lifting side. Simultaneously, one wire delivery pulley is placed under the catenary wire support clamp of the horizontal arm to prepare for the deployment and attachment of the catenary wire.

[0015] The new contact wire is raised using a temporary rigid anchor in the track assembly, and after the temporary anchor of the new contact wire is raised, the constant tension wire installation vehicle slowly moves forward to deploy the new contact wire, the anchor of the new contact wire and the tension of the overhead line are 7KN, the overhead line speed is 5km / h, and the new contact wire is attached to the old catenary wire using a special S-hook 7.

[0016] Subsequently, a temporary anchor hoisting of the new catenary wire is performed, with the anchor hoisting method being the same as for the new contact wire. The anchor hoisting of the new catenary wire and the tension of the overhead line are 3KN to 5KN, and the overhead line speed is 3 to 5 km / h. The new catenary wire is placed under the catenary wire support clamp of the horizontal arm using a wire delivery pulley, the constant tension wire delivery vehicle for deploying the contact wire is positioned in front, and the catenary wire wire delivery vehicle is positioned at a safety distance of at least 100 meters behind.

[0017] This invention reduces the load on the guy wire foundation 8 corresponding to the anchor lifting and anchor lowering anchor columns by first removing the weight strings of the old contact wire and the old catenary wire. Additionally, the new contact wire is temporarily suspended in multiples on the old catenary wire, and the new catenary wire is temporarily suspended in multiples on the wire delivery pulley to distribute the load on the anchor lifting anchor column.

[0018] In step S3, where the compensation device is replaced, After the temporary anchor lifting of the catenary and contact wires, in the wire feed-out process, the old compensators, anchor angle steels, and limiting frames, whose tension has already been reduced, are simultaneously removed from both the anchor lifting and anchor lowering sides. New anchor angle steels, limiting frames, compensators, and weight strings for the catenary and contact wires are then installed. The new weight strings are lifted using a lever hoist to the height of the compensator design value b + the initial elongation of the new catenary and contact wires, and the pulley spacing is adjusted and sealed to the compensator design value a to prevent changes in the pulley spacing. The new contact wires are then lowered to the new compensator on the anchor lifting side to complete the formal anchor lifting, and finally the new catenary wires are lowered to the new compensator on the anchor lifting side to complete the formal anchor lifting.

[0019] In step S4 of lowering the anchors of the catenary and contact wire, after replacing the compensation device, the new contact wire anchor is lowered. However, before lowering the anchor, the tension of the old contact wire is reduced by the lever hoist in the auxiliary rope 1, and the track vehicle set tightens the wire to adjust the anchor lowering tension to 15 KN. After the new contact wire is connected to the new compensation device on the anchor lowering side, the new catenary wire anchor is lowered. After the anchor lowering of the new catenary and contact wire is completed, the a-value and b-value of the compensation device are re-measured and adjusted. The new catenary wire is pulled down to the catenary wire support clamp, and the special S-hook 7 with the new contact wire is pulled down to the new catenary wire.

[0020] In step S5 of removing the old wire, after the anchor lowering of the new catenary and contact wire is completed, the old wire is disconnected at the central anchor, and the old catenary and contact wire 2 slowly lands using a large rope. The removal of the old catenary and contact wire 2 includes the removal of the old catenary wire, contact wire, dropper, and electrical connection wire. The disconnection point is provided at the position of the central anchor. After the wire lands, segment disconnection is performed and carried out of the system using a trolley.

[0021] In step S6 of attaching the dropper and electrical connection wire and adjusting the overhead contact system, after attaching the dropper, the special S-hook 7 is removed.

[0022] Regarding the dropper installation location, once construction has begun and personnel have entered the system, a dedicated person (dedicated staff) will measure the position using a measuring tape according to the dropper placement chart and mark it on the rails and stone bolsters with a marker pen for easy viewing by the upper dropper installation personnel. After the dropper installation is complete, two adjustment groups will be set up, and a flat-press inspection will be performed from the central anchor position toward the anchor columns on both sides. Two adjacent anchor segments will all be fitted with new electrical connection wires to the joints of the new overhead contact system, and the newly erected overhead contact system will be adjusted to meet the design parameter requirements.

[0023] In step S2, when attaching the auxiliary rope 1, one 1.5T guide pulley 3 is attached to the field side of the anchor angle steel of the old catenary and contact wire 2. One end of each of the two auxiliary ropes 1 passes through the two guide pulleys 3 and is connected to the lever hoist, and the other end of the lever hoist is connected to the guy wire foundation 8. The other end of the auxiliary rope 1 is connected to the old catenary and contact wire 2 using the wire gripper 4. When in use, the auxiliary rope 1 is tightened with the wrench hoist on the guy wire foundation 8 side, and the load (force) is applied to the auxiliary rope 1, causing the compensating device to droop. At this time, the tension of the old wire has already been transferred to the auxiliary rope 1, and the old weight string 5, compensating device and insulator can be removed.

[0024] In step S2, during the new contact wire deployment process, a dedicated person in the track assembly attaches the upper end of a pre-made (pre-prepared) special S-hook 7 to the old catenary wire, and the lower end of the special S-hook 7 pulls the new contact wire, ensuring the smoothness of the new contact wire during the deployment process. Each strut has a positioning point, and 1-meter special S-hooks 7 are used on both sides of each strut (support column) 6. On average, two 0.8-meter S-hooks are placed in the center (middle span), meaning that four special S-hooks 7 are placed in each span (between two struts). The special S-hooks 7 are made using 8mm diameter round reinforcing bars, and the parts that are bent at the top and bottom are covered with heat-shrinkable rubber or nylon tubing to prevent wire wear. The upper end of the special S-hook 7 is short spiral in shape to prevent it from falling off, and the lower end of the special S-hook 7 is hook-shaped, and the special S-hook 7 is removed after the dropper is attached.

[0025] In step S2, after the auxiliary ropes 1 on both the anchor lifting and anchor lowering sides are simultaneously loaded, the old weight string 5 is removed, as well as the old central anchor. The new catenary and contact wires can be used to lift the anchor using a rigid anchoring method, attaching the two auxiliary ropes 1 to the opposite side of the strut 6 to lift the anchor, or to temporarily lift the anchor using the old catenary wire and wire anchor angle steel, or to lift the anchor in any other way, as long as the compensating device is replaced and the load requirements of the guy wire foundation 8 are met.

[0026] In step S3, during the installation process of the new compensating device, the values ​​of a and b may change. After the new catenary and contact wires are connected to the new compensating device and formal anchor raising and lowering are performed, the b value can be adjusted to meet the design requirements by adjusting the length of the compensating cable. The pulley spacing a value can be adjusted in advance. The two upper compensating cables between the dynamic pulleys are secured with a wire chuck (wire clip) to ensure that the a value does not change. After the new catenary and contact wires are connected to the new compensating device, the wire chuck is removed to ensure that the pulleys are free to move. Adjustments can also be made in other ways. After formal anchor lowering is performed, the compensating device parameters can be adjusted to predetermined values ​​all at once.

[0027] In step S4, the new contact wire is lowered to the anchor by adjusting the tension value to the design value using a constant tension wire feeder, while the new catenary wire is lowered manually.

[0028] In step S2, when the anchor lifting side is open, a temporary anchor lift of the new contact wire is performed, the constant tension wire delivery vehicle parks at a switching pole near the anchor lifting anchor column, the new contact wire passes on the side of the contact wire closer to strut 6 (indicating the combination of contact wire and catenary wire that directly contacts the pantograph (receiving bow) and transmits power during normal rail operation), the constant tension wire delivery vehicle loosens the wire, and the contact wire is manually pulled to the anchor lifting anchor column, and the anchor is lifted using a temporarily stiff anchor to start the overhead line, a temporary anchor lift of the new catenary wire is performed, the wire delivery vehicle moves to a switching pole away from the anchor lifting anchor column, and the wire is manually pulled The wire is pulled and passes through a special type pulley (special type wire feed pulley device for catenary wire overheading in CN220332517U) that is attached to the horizontal arm in advance, and the anchor is temporarily pulled up to the anchor column for anchor retrieval using a stiff anchor to start overheading. When the anchor retrieval side is closed, the constant tension wire feed vehicle and the catenary wire feed vehicle are both parked at a switching column close to the anchor column for anchor retrieval, and a new contact wire is manually pulled, passes over the work support contact wire, and the anchor is temporarily pulled up to the anchor column for anchor retrieval using a stiff anchor. The new catenary wire passes over the work support catenary wire and the anchor is temporarily pulled up to the anchor column for anchor retrieval using a stiff anchor.

[0029] In step S4, when the anchor lifting side is open, the constant tension wire feed vehicle parks 10 meters from the anchor lowering anchor column, the new contact wire is tightened by the constant tension wire feed vehicle to adjust the anchor lowering tension to 15KN, the old contact wire tension is reduced manually using a lever hoist, the end clip is attached using a work platform and connected to the new compensation device on the anchor lowering side to lower the anchor, the anchor is lowered, the catenary wire feed vehicle operates and parks at a switching column away from the anchor lowering anchor column, the new catenary wire is manually passed through a special pulley that is previously attached to the horizontal arm on which the old catenary wire is hung, the old catenary wire tension is reduced manually using a lever hoist, the new catenary wire is manually pulled and adjusted to a predetermined value all at once and then connected to the new compensation device on the anchor lowering side to lower the anchor, when the anchor lifting side is closed, the constant tension wire feed vehicle The anchor lowering vehicle is parked 10 meters from the anchor column, the new contact wire is tightened by the constant tension wire feed vehicle to adjust the anchor lowering tension to 15KN, the old contact wire tension is reduced manually using a lever hoist, the end clip is attached using a work platform and connected to the new compensator on the anchor lowering side to lower the anchor, the anchor is lowered, the catenary wire feed vehicle is operated and parked 10 meters from the anchor column, the new catenary wire is cut from the wire reel, manually passed over the work support contact wire, pulled to the new compensator on the anchor lowering side, the wire is manually pulled and the weight string on the anchor lifting side is lifted under load, the wire pull is stopped on the anchor lowering side, the new catenary wire is connected to the new compensator on the anchor lowering side to lower the anchor, the old catenary wire tension is reduced first before lowering the anchor with the new catenary wire.

[0030] The specific construction method of this invention will be explained using the example of major repair work on an overhead contact system for a dedicated passenger transport line.

[0031] The work includes replacing the catenary and contact wires, replacing the droppers, and replacing the compensating device. The design tension for the new catenary and contact wires is 15KN + 15KN, and the old wire tension is 15KN + 15KN. The compensating device is a compensating pulley, and the catenary and contact transmission ratio is 1:3 for all. The existing guy wire foundation 8 has a design maximum tensile strength of 45KN, and the specific construction process is shown in Figure 1.

[0032] Step S1, the preliminary preparation phase for construction, mainly includes data measurement, site surveys, wire reel inspections, and track car assembly. In data measurement, the data measured includes the height of the catenary wire positioning points, the outer rail height, and the distance between each positioning point. Dropper calculations are performed using dedicated overhead contact system calculation software, and the calculations are completed in advance using a dedicated prefabricated platform for the droppers. During installation, a dedicated person is present on the rail to mark the suspension wire attachment points with a marker pen. In the on-site survey, based on Figure 2, a schematic plan view of the wire replacement, all anchor lifting sides were closed, and the wire routing path was determined. In the wire reel inspection, after checking that the wire reel length is correct, it is lifted onto the constant tension wire delivery vehicle and the catenary wire delivery vehicle, and fastened to the four sides of the wire delivery rack using a figure-eight fastening method with wire rope, wreath bolts, and steel wire chucks. Following the principle that the track vehicle formation installs the contact wires before installing the catenary wires, the formation is as shown in Figure 3: constant tension wire delivery vehicle (front) + work vehicle + catenary wire delivery vehicle + work vehicle (rear).

[0033] Step S2, which involves laying a wire on the anchor-lifting side, includes steps S2.1 to S2.2. In step S2.1, which is the preparation for raising the anchor, After a power outage order is issued and the site supervisor is notified that work can be carried out on the lever, the person at each positioning point places one wire feed pulley under the catenary wire support clamp to prepare for the deployment and attachment of the new catenary wire, lifts the anti-positioning pipe and ties it to the inclined arm pipe with iron wire to prevent contact with the wire release pole when the wire is deployed by the constant tension wire feeder, and depending on the track conditions, when raising the anchor in the section, it may be necessary to attach a special type pulley inside to the tip of the horizontal arm that is not supported and has been lifted, to facilitate the wire installation on the anchor raising side of the new catenary wire. One 1.5T pulley is attached to each of the anchor corner steels of the old catenary and contact wire, two auxiliary ropes 1 pass through two guide pulleys and are connected to a lever hoist, the other end of the lever hoist is connected to a wire sleeve, the wire rope sleeve is connected to a U-ring, completing the connection between the auxiliary ropes 1 and the guy wire foundation 8 (Figure 4), the other end of the auxiliary ropes 1 is connected to the old wire using a wire gripper 4, the auxiliary ropes 1 are tightened with a wrench hoist on the guy wire foundation 8 side, the auxiliary ropes 1 are loaded and the compensating device is lowered, at which point the tension of the old wire has already been transferred to the auxiliary ropes 1, and at the same time the old wire is connected to the other lever hoist The thread string 5 can be lifted, and the old weight string 5, compensator and insulator can be removed. After the auxiliary ropes 1 on both the anchor lifting side and the anchor lowering side are loaded simultaneously, not only can the old weight string 5 be removed, but the old central anchor can also be removed and a new central anchor can be installed. This means that after the old catenary and contact wires 2 are pulled down onto the auxiliary ropes 1, the central anchor can be replaced. Synchronously, the old contact wires can be detached from the positioning wire chuck of the old central anchor and secured with iron wire, and the old catenary wires can be pulled down from inside the catenary wire support clamp and temporarily attached to the side of the horizontal arm closer to the strut 6.

[0034] In step S2.2, where a wire is temporarily installed on the anchor lifting side, first, a new contact wire is temporarily installed to lift the anchor. According to the schematic wire replacement plan diagram (Figure 2), the anchor lifting side is closed, the constant tension wire delivery vehicle is positioned and parked near the switching column close to the anchor lifting column, the tension reel rotates, and a new contact wire is brought out. The wire surface of the new contact wire is manually inspected, and if there are no errors, it is positioned on the calibrator and wire removal column, the new contact wire is passed through the calibrator and wire removal column, over the working support contact wire, and pulled to the anchor lifting column. The wire end of the new contact wire is fitted with a terminal clip and connected to the old double ring lever, and the anchor is lifted using a temporarily stiff anchor. The constant tension wire delivery vehicle adjusts the tension via the tension reel, increasing the tension to 7KN, the travel speed is 5km / h, and it travels at a uniform speed on the anchor lowering side, and a dedicated person is positioned on the wire removal column. The system is designed and controlled to adjust the position and height of the wire delivery column in the lateral direction of the wire based on the wire travel path. After the constant tension wire delivery vehicle leaves the joint, the catenary wire delivery vehicle is positioned and parked at a switching column close to the anchor lifting anchor column. The wire is then manually pulled over the working support catenary wire, temporarily lifting the anchor to the anchor lifting anchor column. The connection method is the same as the temporary anchor lifting of a new contact wire. If the catenary wire is lifting the anchor within the area, the new catenary wire is manually passed through a special pulley, then connected to the insulator to lift the anchor. During the new catenary wire deployment process, a ladder truck follows behind the wire delivery vehicle. The person inside the ladder truck pulls the deployed new catenary wire down to a wire delivery pulley that has been pre-installed under the horizontal arm, preventing wire damage due to floor friction, rail hook abrasion, etc.

[0035] In step S3, where the compensation device is replaced, First, the anchor angle steel is installed, the installation height of the anchor angle steel is returned to 7500 mm above the track surface, the wire anchor angle steel is returned to 6200 mm above the track surface, the compensating pulley a value is adjusted, and then the two compensating cables on the top of the dynamic pulley are held down using a steel wire chuck to prevent the pulley from sliding and to prevent changes in the dynamic pulley spacing during the pulley installation process. The compensating pulley, pestle-type ring handle and insulator are then installed. Ground workers align the weight strings with the weight string rods, connect the weight string rods and compensating cables, and use a lever hoist to lift the compensating device to the design b value + the height of the first extension of the new catenary or contact wire. After the new compensating pulley and weight string have been installed, the new catenary and contact wires are pulled down to the new compensating pulley on the anchor lifting side, the new contact wires are connected, the wire covers are placed over strut 6, the lever hoist is connected, the lever hoist is connected to the cable, the new contact wires are connected, the new contact wires are tightened through the lever hoist, the old double ring lever is lowered, the wire tightening is stopped, the end clip is opened at the connection point of the old double ring lever, the new contact wire and the new insulator end ear are aligned, the new contact wire is marked, leaving a length for turning, the wire is cut and the end clip is reattached, the connection with the new insulator is completed and the anchor lifting is performed formally, simultaneously opening the steel wire chuck between the moving pulleys to make the pulley transmission flexible, and the operation of pulling down the new catenary wire to the new compensating pulley on the anchor lifting side coincides with the new contact wire.

[0036] In step S4, where the catenary and contact wire anchors are lowered, According to schematic diagram 2 of the wire replacement plan, the anchor lowering side is closed. After lowering the new contact wire, the constant tension wire delivery vehicle moves and parks at the anchor column for anchor lowering. The old contact wires on both the anchor lifting side and the anchor lowering side are loosened using the lever hoist at the guy wire foundation 8 to reduce the tension of the old contact wires. The tension of the constant tension wire delivery vehicle is increased to the design value of 15KN. The new contact wire is transferred to the anchor column for anchor lowering using the wire removal column. Personnel on the work platform align the new contact wire with the new insulator end ear and mark it. After noting, leaving a 500mm turning length, the wire is cut and a termination clip is attached, and after connecting to the new insulator, the steel wire chuck between the dynamic pulleys is opened to make the pulley transmission flexible, the lever hoist of the weight string of the new contact wire is loosened and fixed, the new weight string is loaded, the tension wire feeder releases tension and moves forward, after the anchor lowering of the new contact wire is complete, the a and b values ​​of the new compensation pulley on the anchor lowering side are adjusted, and after the parameters meet the requirements, the new contact wire is pulled down to the positioning wire clip, and the center anchor cable of the new contact wire is attached. After the new contact wire anchoring is complete, both sides begin to release the tension on the old catenary wire. The catenary wire feeder is parked 10 meters behind the anchor column for anchoring and the wire is cut. A pulley is placed on the field side of the top of the anchor column for anchoring, and a large rope is passed through the pulley and connected to the wire gripper 4. The other end of the wire gripper 4 is connected to the cut new catenary wire. The wire is manually pulled to tighten the new catenary wire, and after lifting the catenary wire weight string 200 mm on the anchor lifting side, the pulling of the wire is stopped on the anchoring side. On the work platform, the person attaches the end clip to the alignment marker of the new catenary wire and insulator, connects it to the new insulator and lowers the anchor, simultaneously opening the steel wire chuck between the fixed pulleys to make the pulley transmission flexible, loosening the lever hoist that secures the weight string of the new catenary wire, loading the new weight string, and after the anchoring of the new catenary wire is complete, the special S-hook 7 is pulled down onto the new catenary wire at each positioning point, the new compensation device a and b values ​​on the anchor lowering side are adjusted, and the new catenary wire is pulled down onto the catenary wire support clamp.

[0037] In step S5, which involves removing the old wire, after the anchoring of the new wire is complete, the old catenary and contact wire 2, whose tension has been reduced, are removed, and the wire is tightened on both sides of the break point at the central anchor position using the wire gripper 4 and lever hoist. After the wire breaks, the wire is slowly lowered using a large rope.

[0038] In step S6, which involves installing the dropper and electrical connection wires and adjusting the overhead contact system, after installing the dropper, remove the special S-hook 7. After removing the old wires, the droppers are installed according to the dropper positions marked on the rails beforehand. The measurer remeasures the overhead contact system after the droppers are installed, adjusts the overhead contact system, and records the data. The two adjacent anchor sections of the joint are the same newly replaced overhead contact system. The joint is fitted with new electrical connection wires, and finally a cold-slip test is performed to clean up the site and confirm the opening conditions in cooperation with the equipment management department.

[0039] Conventional single-wire replacement methods involve replacing the catenary wire at one skylight and the contact wire at the next skylight. Generally, this requires 120 minutes per skylight, with an effective construction time of approximately 90 minutes. The total effective construction time for two skylights is approximately 180 minutes, wasting about 60 minutes. In contrast, this invention uses one skylight to replace both the catenary and contact wires simultaneously. While the skylight time is slightly longer at approximately 240 minutes, the effective construction time is 210 minutes, resulting in higher skylight utilization efficiency than the single-wire replacement method. Furthermore, this invention enhances the quality of wire deployment by using constant-tension wire delivery and optimizes the design through process steps, ensuring that the load on the struts 6 and guy wire foundations 8 is safe during the overhead wire replacement process and effectively avoiding safety risks such as overload. [Explanation of Symbols]

[0040] 1. Auxiliary rope 2. Old catenary or contact wires 3 Guide pulleys 4 Wire gripper 5 Old weight strings 6 strut 7 Special S-hook 8 Guy wire foundation

Claims

1. Step S1, which is the preliminary preparation for construction, involves assembling the railcars and placing the catenary wire reels and contact wire reels on the assembled railcars. Two sets of auxiliary ropes are attached to the anchor lifting side, and the old catenary and contact wires are pulled down to the guy wire foundation via the auxiliary ropes and secured. The auxiliary ropes are used to tighten the old catenary and contact wires and to loosen the compensating devices of the old catenary and contact wires. At the same time, a lever hoist is used to lift the old weight string, and then the old weight string is removed. The anchor lowering side is performed simultaneously with the anchor lifting side, and the construction method is the same as the anchor lifting side. If necessary, a wire feed pulley is attached below the catenary wire support clamp of the horizontal arm, and the catenary... Step S2 involves preparing for the deployment and attachment of the catenary wire, where the new contact wire is pulled up using a temporary rigid anchor in the track assembly, the new contact wire is deployed, the new contact wire is attached to the old catenary wire using a special S-hook, the temporary anchor of the new catenary wire is pulled up, the anchor pulling method is the same as for the new contact wire, the new catenary wire is deployed, and the new catenary wire is attached to the catenary wire support clamp of the horizontal arm using a wire delivery pulley, and the wire is mounted on the anchor pulling side. Step S3 involves replacing the compensating device, which is performed after a temporary anchor lift of the catenary or contact wire, and during the wire delivery process, the old compensating device, anchor angle steel, and limiting frame, whose tension has already been reduced, are simultaneously removed from both the anchor lifting side and the anchor lowering side, and new anchor angle steel, limiting frame, compensating device, and weight string for the catenary or contact wire are installed. The new contact wire is then lowered into the new compensating device on the anchor lifting side to complete the formal anchor lift, and then the new catenary wire is lowered into the new compensating device on the anchor lifting side to complete the formal anchor lift. After replacing the compensating device, the new contact wire anchor is lowered. However, before lowering the anchor, the tension of the old contact wire is reduced by a lever hoist on the auxiliary rope, and the track vehicle assembly tightens the wire to adjust the anchor lowering tension to 15 kN. After the new contact wire is connected to the new compensating device on the anchor lowering side, the new catenary wire anchor is lowered. After the lowering of the new catenary and contact wire anchors is completed, the new catenary wire is pulled down to the catenary wire support clamp, and the special S-hook to which the new contact wire is attached is pulled down to the new catenary wire. This is step S4 of lowering the catenary and contact wire anchors. Step S5 involves removing the old wires, after the new catenary and contact wires have been lowered to anchor, the old wires are disconnected at the central anchor, and the old catenary and contact wires are slowly lowered using a large rope. Step S6 involves installing the dropper and electrical connection wires and adjusting the overhead contact system. A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system for a passenger transport line, including, In step S2, when attaching the auxiliary ropes, a guide pulley is attached to the field side of the anchor corner steel of the old catenary and contact wire, one end of each of the two auxiliary ropes passes through the two guide pulleys and is connected to a lever hoist, the other end of the lever hoist is connected to the guy wire foundation, and the other end of the auxiliary ropes is connected to the old catenary and contact wire using a wire gripper, characterized in that the catenary and contact wires of the entire anchor section of the overhead contact system of a dedicated passenger transport line are replaced simultaneously.

2. A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system for a passenger transport line as described in claim 1, characterized in that, in step S1, the train configuration is a constant tension wire delivery vehicle (front) + work vehicle + catenary wire delivery vehicle + work vehicle (rear) in accordance with the principle that the train configuration is a constant tension wire delivery vehicle (front) + work vehicle + catenary wire delivery vehicle + work vehicle (rear).

3. A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system for passenger transport lines according to claim 1, characterized in that, in step S2, the anchor raising of the new contact wire and the tension of the overhead line are 7 kN, the overhead line speed is 5 km / h, the anchor raising of the new catenary wire and the tension of the overhead line are 3 kN to 5 kN, the overhead line speed is 3 to 5 km / h, and a constant tension wire delivery vehicle for deploying the contact wires is positioned in front, and a wire delivery vehicle for the catenary wires is positioned behind, maintaining a safety distance of at least 100 meters.

4. In step S2, during the new contact wire deployment process, a dedicated person in the track assembly hooks the upper end of a specially made S-hook onto the old catenary wire, the lower end of the specially made S-hook pulls the new contact wire, ensuring the smoothness of the new contact wire during the deployment process, a 1-meter specially made S-hook is used on both sides of each strut, an average of two 0.8-meter S-hooks are placed in the center of the span, and four specially made S-hooks are placed in each span, and during the new catenary wire deployment process, a dedicated person in the track assembly pulls the deployed new catenary wire down to a wire delivery pulley that is pre-installed below the horizontal arm, characterized in that a construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system of a passenger transport line according to claim 1.

5. A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system for passenger transport lines according to claim 1, characterized in that in step S3, the new weight string is lifted using a lever hoist to a compensation device design value b + the height of the first elongation of the new catenary and contact wire, the pulley spacing is adjusted to the compensation device design value a and sealed to prevent changes in the pulley spacing, and in step S4, after the anchoring of the new catenary and contact wires is completed and before they are pulled down to the new catenary wire support clamp, the compensation device values ​​a and b are remeasured and adjusted.

6. The method for simultaneously replacing the catenary and contact wires of the entire anchor section of an overhead contact system for passenger transport lines according to claim 5, characterized in that, during the installation process of the new compensation device, the values ​​of a and b may change, after the new catenary and contact wires and the new compensation device are connected and formal anchor raising and lowering are performed, the b value can be adjusted to the design requirements by adjusting the length of the compensation cable, the pulley spacing a value can be adjusted in advance, the two upper compensation cables between the movable pulleys are secured with a steel wire chuck to ensure that the a value does not change, the steel wire chuck is removed after the new catenary and contact wires and the new compensation device are connected to ensure that the pulleys are free to move, and adjustments can also be made in other ways, and after formal anchor lowering is performed, the compensation device parameters can be adjusted to predetermined values ​​all at once.

7. In step S2, after the auxiliary ropes on both the anchor lifting side and the anchor lowering side are simultaneously loaded, the old weight string is removed, as well as the old central anchor is removed and a new central anchor is installed, characterized in that the catenary and contact wires of the entire anchor section of the overhead contact system for passenger transport lines as described in 2 are simultaneously replaced.

8. In step S2, when the anchor lifting side is open, a temporary anchor lifting of a new contact wire is performed, the constant tension wire delivery vehicle parks at a switching pole near the anchor lifting anchor column, the new contact wire passes on the side of the working support contact wire closer to the strut, the constant tension wire delivery vehicle loosens the wire, and the contact wire is manually pulled to the anchor lifting anchor column, and the anchor is lifted using a temporarily stiff anchor to start the overhead line operation, the new catenary wire lifts the anchor, the wire delivery vehicle moves to a switching pole away from the anchor lifting anchor column, the wire is manually pulled and passes through a special pulley that is previously attached to the horizontal arm, and is temporarily pulled to the anchor lifting anchor column. A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system of a passenger transport line as described in 2, characterized in that, when the anchor lifting side is closed, a constant tension wire delivery vehicle and a catenary wire delivery vehicle are both parked at a switching pole close to the anchor lifting anchor pole, a new contact wire is manually pulled, passes over the work support contact wire, and the anchor is temporarily lifted using a rigid anchor to the anchor lifting anchor pole, and a new catenary wire passes over the work support catenary wire and the anchor is temporarily lifted using a rigid anchor to the anchor lifting anchor pole.

9. In step S4, when the anchor lifting side is open, the constant tension wire feed vehicle parks at a position 10 meters from the anchor lowering anchor column, the new contact wire is tightened by the constant tension wire feed vehicle to adjust the anchor lowering tension to 15 kN, the old contact wire tension is reduced manually using a lever hoist, the end clip is attached using a work platform and connected to the new compensation device on the anchor lowering side to lower the anchor, the anchor is lowered, the catenary wire feed vehicle operates and parks at a switching column away from the anchor lowering anchor column, the new catenary wire is manually passed through a special pulley that is previously attached to the horizontal arm on which the old catenary wire is hung, the old catenary wire tension is reduced manually using a lever hoist, the new catenary wire is manually pulled and adjusted to a predetermined value all at once and then connected to the new compensation device on the anchor lowering side to lower the anchor, when the anchor lifting side is closed, the constant tension wire feed vehicle The anchor lowering vehicle is parked 10 meters from the anchor column, a new contact wire is tightened by a constant tension wire feeder to adjust the anchor lowering tension to 15 kN, the old contact wire tension is reduced manually using a lever hoist, the end clip is attached using a work platform and connected to the new compensator on the anchor lowering side to lower the anchor, and the anchor is lowered. The catenary wire feeder is operated and parked 10 meters from the anchor column, the new catenary wire is cut from the wire reel, manually passed over the work support contact wire, pulled to the new compensator on the anchor lowering side, the wire is manually pulled, the weight string on the anchor lifting side is lifted under load, the wire pull is stopped on the anchor lowering side, the new catenary wire is connected to the new compensator on the anchor lowering side to lower the anchor, and the anchor is lowered, similarly the old catenary wire tension is reduced first before lowering the anchor with the new catenary wire.A construction method for simultaneously replacing the catenary and contact wires of the entire anchor section of the overhead contact system for a passenger transport line as described in feature 2.

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