Construction method for simultaneously replacing catenary and contact wires of entire anchor section of overhead contact system of passenger-dedicated line

Abstract

A construction method for simultaneously replacing catenary and contact wires of an entire anchor section of an overhead contact system of a passenger-dedicated line. The construction method comprises: performing preparation at an early stage of construction; erecting wires on a starting anchor side; replacing compensation devices; performing anchoring of catenary and contact wires; removing old wires; and performing dropper and electrical connection installation, and adjusting an overhead contact system. By means of the construction method in which new contact wires are firstly erected and new catenary wires are immediately erected thereafter, and by means of rationally designed process steps during the process of erection, the present application can always keep the tension on existing uprights and existing guy wire foundations within the load ranges thereof, the construction efficiency is improved, construction windows are reduced, and the safety of wire replacement construction is ensured.

Description

A construction method for simultaneously replacing the entire anchor section of the contact network of a passenger dedicated line Technical Field

[0001] The present application belongs to the technical field of electrified railway contact network construction, and specifically relates to a construction method for simultaneously replacing the supporting conductors of the entire anchor section of the passenger dedicated line contact network. Background Art

[0002] my country's electrified railways are developing rapidly, with technological advancements constantly improving. However, earlier electrified railways are relatively outdated, with aging equipment entering a period of overhaul. This overhaul primarily involves replacing catenary cables and contact wires to improve their standards.

[0003] Common cable replacement methods include single-wire cable replacement and simultaneous cable replacement. Single-wire cable replacement involves replacing the load-bearing cable in one window and the contact wire in the next window. The two windows complete the cable replacement for one anchor section, resulting in low construction efficiency. Simultaneous cable and contact wire replacement typically involves deploying the load-bearing cable simultaneously, removing the old load-bearing cable before anchoring, and then anchoring the new cable. While this method allows for simultaneous cable replacement in a single window, it doesn't utilize the constant-tension cable-laying construction process. According to the "High-Speed ​​Railway Electric Traction Power Supply Project Quality Acceptance Standard" and the requirements of relevant equipment management units, constant-tension cable-laying is currently required for all contact network installations. Failure to use constant-tension cable-laying guarantees the quality of the contact wire deployment, potentially leading to quality issues such as twisted contact wires, hard spots, and surface scratches.

[0004] Cables exert tension. During the installation of conductors, the presence of both new and old conductors can overload and fracture the support posts. Guy wires are designed to stabilize the posts, balancing the tension in all directions and preventing them from bending or toppling. To stabilize the posts and prevent the risk of increased tension during conductor replacement, additional cables are often used to reinforce the posts. However, these additional cables are attached to the existing base, posing a safety hazard of overloading the base.

[0005] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0006] The purpose of this application is to provide a construction method for simultaneously replacing the supporting conductors of the entire anchor section of the passenger dedicated line contact network, so as to solve or alleviate the problems existing in the above-mentioned prior art.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] A construction method for simultaneously replacing the supporting conductors of the entire anchor section of a passenger dedicated line contact network, comprising:

[0009] S1. Preliminary preparation for construction: marshaling of rail cars, and placement of catenary cable drums and contact wire drums on the marshaled rail cars;

[0010] S2. Anchoring and setting up lines:

[0011] First, install two sets of auxiliary ropes on the anchoring side, and use the auxiliary ropes to lower the old supporting wire to the guying foundation and fix it; use the auxiliary ropes to tighten the old supporting wire to loosen the old supporting wire compensation device, and at the same time use a hand hoist to first lift the old sinker string, and then remove the old sinker string; the anchoring side and the anchoring side are carried out simultaneously, and the construction method is the same as the anchoring side; if needed, hang a wire pulley under the horizontal wrist arm load-bearing cable seat to prepare for the load-bearing cable to be deployed and hung;

[0012] The new contact wire is temporarily anchored using a railcar, and the new contact wire is deployed and suspended from the old catenary using a special S-hook. The new catenary is then temporarily anchored using the same method as the new contact wire. The new catenary is deployed and suspended below the flat arm catenary cable seat using a pay-out pulley.

[0013] S3. Replacement of compensation device:

[0014] After the supporting conductor is temporarily anchored, during the line payout process, the old compensating device, anchor angle steel, and limiting frame, which have been relieved of tension, are removed from both sides of the anchoring and lowering. The new supporting conductor anchor angle steel, limiting frame, compensating device, and sinker string are installed. First, the new contact wire is tilted onto the new compensating device on the anchoring side to complete the formal anchoring. Then, the new load-bearing cable is tilted onto the new compensating device on the anchoring side to complete the formal anchoring.

[0015] S4. Anchoring of the supporting conductor:

[0016] After the compensation device is replaced, the new contact wire is anchored first. Before anchoring, the old contact wire is unloaded using the lever hoist on the auxiliary cable. The railcar adjusts the tension of the anchor to 15kN. The new contact wire is connected to the new compensation device on the anchoring side, and then the new catenary is anchored. After the new catenary is anchored, the new catenary is placed in the catenary seat, and the special S-hook for hanging the new contact wire is placed on the new catenary.

[0017] S5. Removal of old conductor: After the new conductor is anchored, the old conductor is cut at the middle anchor and the old conductor is slowly lowered to the ground with a large rope.

[0018] S6, installation of droppers, electrical connection lines, and adjustment of contact lines;

[0019] In step S2, when installing the auxiliary rope, a guide pulley is installed on each side of the field of the old supporting wire anchor angle steel, and one end of the two auxiliary ropes is passed through the two guide pulleys respectively and connected to the hand-operated hoist, and the other end of the hand-operated hoist is connected to the wire base; the other end of the auxiliary rope is connected to the old supporting wire using a tensioner. Beneficial effects:

[0020] The present application provides a construction method in which, during the overhaul of the passenger dedicated line contact network, a new line is first erected and the old line is subsequently dismantled, and the load-bearing cables and the contact line are replaced within the same construction window, wherein the contact line is erected using a constant-tension wire-erecting vehicle and the load-bearing cables are erected using a small-tension vehicle, and the new contact line is erected first and then the new load-bearing cables are erected. In addition, during the erection process, through reasonably designed process steps, the tension of the existing pillars and the existing guying foundation can always be kept within their load range, thereby improving construction efficiency, saving construction windows, and ensuring the safety of the line replacement construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a flow chart of the construction process.

[0022] FIG2 is a plan view of the thread replacement according to an embodiment of the present application.

[0023] FIG3 is a schematic diagram of a railcar formation according to an embodiment of the present application.

[0024] FIG4 is a schematic diagram showing the connection between the auxiliary cable and the old supporting conductor according to an embodiment of the present application.

[0025] FIG5 is a schematic structural diagram of a special S-hook according to an embodiment of the present application.

[0026] In the picture: 1. Auxiliary rope; 2. Old supporting wire; 3. Guide pulley; 4. Wire tensioner; 5. Old sinker string; 6. Support; 7. Special S hook; 8. Wire pulling foundation. DETAILED DESCRIPTION

[0027] The term "supporting wire" is a commonly used general term for supporting cables and contact wires in this field. When there is no need to distinguish between supporting cables and contact wires, this article uses the term "supporting wire" to refer to both supporting cables and contact wires.

[0028] As shown in FIG1 , a construction method for simultaneously replacing the entire anchor section of the contact network of a passenger dedicated line includes:

[0029] S1. Pre-construction preparation: This includes site investigation, measurement of prefabricated hanging string data, confirmation of anchor openings and closings, definition of the cable threading plan, railcar marshaling, cable reel inspection, and placement of the catenary cable and contact wire reels on the marshaled railcars. The railcar marshaling follows the principle of erecting the contact wire first and then the catenary cable. The marshaling consists of a constant tension pay-off vehicle (front vehicle) + a work vehicle + a catenary cable pay-off vehicle + a work vehicle (rear vehicle). Figure 3 shows a schematic diagram of the railcar marshaling.

[0030] S2. Anchoring and setting up lines:

[0031] As shown in Figure 4, two sets of auxiliary ropes 1 are first installed on the anchoring side, and the old supporting wire 2 is respectively poured onto the wire base 8 through the auxiliary ropes 1 and fixed; the auxiliary ropes 1 are used to tighten the old supporting wire to relax the old supporting wire compensation device, and at the same time, a hand hoist is used to first lift the old sinker string 5, and then remove the old sinker string 5. At this time, the sinker string in Figure 4 is indicated as the old sinker string 5 (the existing sinker string); the anchoring side and the anchoring side are carried out simultaneously, and the construction method is the same as the anchoring side; at the same time, a line-paying pulley is hung under the flat wrist arm load-bearing cable seat to prepare for the load-bearing cable to be deployed and hung;

[0032] The new contact line is temporarily anchored using a rail vehicle. After the temporary anchoring of the new contact line is completed, the constant tension stringing vehicle slowly moves forward to deploy the new contact line. The anchoring and stringing tension of the new contact line is 7 kN, and the stringing speed is 5 km / h. The new contact line is suspended on the old load-bearing cable using a special S-hook 7;

[0033] Immediately afterwards, the new catenary cable is temporarily anchored. The anchoring method is the same as that of the new contact line. The anchoring and stringing tension of the new catenary cable is 3kN-5kN, and the stringing speed is 3-5km / h. The new catenary cable is suspended under the flat arm catenary cable seat using the pay-out pulley. The constant tension pay-out vehicle for deploying the contact line is in front, and the catenary cable pay-out vehicle is at least 100 meters behind.

[0034] The present application can reduce the force on the anchor post and the anchor post corresponding to the guy wire foundation 8 by first removing the old contact line weight string and the old bearing cable weight string; at the same time, the new contact line is temporarily suspended on the old bearing cable at multiple points, and the new bearing cable is temporarily suspended on the line-laying pulley at multiple points to disperse the force on the anchor post;

[0035] S3. Replacement of compensation device:

[0036] After the supporting conductor is temporarily anchored, during the line payout process, the old compensating device, anchor angle steel, and limiting frame, which have been relieved of tension, are simultaneously removed from both sides of the anchoring and lowering. The new anchor angle steel, limiting frame, compensating device, and weight string are installed. The new weight string is raised to the height of the compensation device's design b value + the initial extension of the new supporting conductor using a lever hoist. The pulley spacing is adjusted to the compensation device's design a value and sealed to prevent the pulley spacing from changing. First, the new contact wire is tilted onto the new compensating device on the anchoring side to complete the formal anchoring. Then, the new load-bearing cable is tilted onto the new compensating device on the anchoring side to complete the formal anchoring.

[0037] S4. Anchoring the contact wire: After the compensation device is replaced, the new contact wire is anchored first. Before anchoring, the old contact wire is unloaded using the lever hoist on the auxiliary cable 1. The constant tension pay-off vehicle adjusts the anchor tension to 15kN. The new contact wire is connected to the new compensation device on the anchoring side, and then the new bearing wire is anchored. After the new bearing wire is anchored, the a and b values ​​of the compensation device are remeasured and adjusted. The new bearing wire is placed in the bearing wire seat, and the special S hook 7 for hanging the new contact wire is placed on the new bearing wire.

[0038] S5. Removal of the old conductor: After the new conductor is anchored, the old conductor is disconnected at the middle anchor and slowly dropped to the ground using a large rope. The removal of the old conductor includes the removal of the old load-bearing wire, contact wire, dropper string, and electrical connection wire. The disconnection point is set at the middle anchor position. After the conductor drops to the ground, it is disconnected in sections and transported out of the network using a trolley.

[0039] S6, installation of suspension strings and electrical connection lines, and adjustment of the contact network; after the suspension strings are installed, the special S hook 7 is removed;

[0040] Regarding the installation position of the suspension strings, at the beginning of the construction blockade and after personnel enter the network, a dedicated person will use a tape measure to measure the position according to the suspension string arrangement table, and mark it on the rail or stone sleeper with a marker to facilitate inspection by the upper suspension string installers; after the suspension strings are installed, two adjustment teams will be set up to push forward from the middle anchor position toward the anchor columns on both sides for inspection, and new electrical connecting lines will be installed at the joints of the two adjacent anchor sections where both are new contact lines, and the newly erected contact line will be adjusted to meet the design parameter requirements.

[0041] In step S2, when installing the auxiliary rope 1, a 1.5T guide pulley 3 is installed on each side of the anchor angle steel of the old supporting conductor 2 in the field, and one end of the two auxiliary ropes 1 is passed through the two guide pulleys 3 respectively and connected to the hand-operated hoist, and the other end of the hand-operated hoist is connected to the wire base 8; the other end of the auxiliary rope 1 is connected to the old supporting conductor 2 using a tensioner 4; when in use, the auxiliary rope 1 is tightened with the hand-operated hoist on the side of the wire base 8, so that the auxiliary rope 1 is subjected to force and the compensation device droops. At this time, the tension of the old wire has been transferred to the auxiliary rope 1, and the old weight string 5, compensation device and insulator can be removed.

[0042] Step S2, during the deployment of the new contact wire, a special person is assigned to the rail car to hang the upper end of the prefabricated special S hook 7 on the old load-bearing cable, and drag the new contact wire with the lower end to ensure the smoothness of the new contact wire during the deployment process; each pillar has a positioning point, and a 1-meter special S hook 7 is used on both sides of each pillar 6. Two 0.8-meter special S hooks 7 are evenly arranged in the span, that is, four special S hooks 7 are arranged in each span (between two pillars); the special S hook 7 is made of 8mm diameter smooth round steel bars, and the upper and lower bent parts are heat-shrinkably covered with rubber or nylon tubes to prevent wear on the wire; the upper end of the special S hook 7 is a short spiral to prevent it from falling off, and the lower end of the special S hook 7 is hook-shaped; the special S hook 7 is removed after the suspension string is installed.

[0043] In step 2, after the auxiliary ropes 1 on both sides of the lifting and lowering anchors are simultaneously stressed, in addition to removing the old weight string 5, the old center anchor can also be removed; in addition, the new supporting wire is anchored by a hard anchor method, and two auxiliary ropes 1 can be installed on the other side of the pillar 6 for anchoring, or the old supporting wire and anchor angle steel can be used for temporary anchoring, or other methods can be used for anchoring, just to facilitate the replacement of the compensation device and meet the load requirements of the wire base 8.

[0044] In step 3, during the installation of the new compensation device, the values ​​of a and b may change. After the new supporting conductor is connected to the new compensation device to form a formal lifting and lowering anchor, the value of b can be adjusted to the design requirement by adjusting the length of the compensation rope. The pulley spacing a value can be adjusted first, and the two upper compensation ropes between the movable and fixed pulleys are clamped and fixed with steel wire clips to ensure that the value of a remains unchanged. After the new supporting conductor is connected to the new compensation device, the steel wire clips are removed to ensure that the pulleys move flexibly. Adjustments can also be made through other methods to ensure that the parameters of the new compensation device are in place at one time after the formal anchoring is formed.

[0045] In step 4, the new contact line is anchored by adjusting the tension value to the design value using a constant tension pay-out vehicle, and the new load-bearing cable is anchored manually.

[0046] In step S2, when the anchoring side is open, the new contact line is temporarily anchored, the constant tension pay-off vehicle stops at the conversion column close to the anchoring anchor column, the new contact line passes through the working branch contact line close to the pillar 6, the constant tension pay-off vehicle loosens the line, and the contact line is manually pulled to the anchoring anchor column, and the hard anchor is temporarily used to start the line setting; the new bearing cable is temporarily anchored, the pay-off vehicle runs to the conversion column away from the anchoring anchor column, and the line is manually pulled from the special pulley (CN220) pre-installed on the flat wrist arm. The catenary wire in 332517U is passed through a special pay-out pulley device, and a hard anchor is temporarily used to anchor at the anchor post to start the line setting. When the anchoring side is closed, the constant tension pay-out vehicle and the catenary wire pay-out vehicle are both parked at the transfer post near the anchor post. The new contact wire is manually pulled through above the working support contact wire and temporarily anchored at the anchor post using a hard anchor. The new catenary wire is passed above the working support wire and temporarily anchored at the anchor post using a hard anchor.

[0047] In step 4, when the anchoring side is open, the constant tension pay-off vehicle stops at a position 10 meters above the anchoring column, the new contact line is adjusted to 15KN by the constant tension pay-off vehicle, the old contact line tension is manually unloaded using a lever hoist, and the terminal wire clamp is installed using the working platform to connect the anchoring side new compensation device; the catenary pay-off vehicle moves to the conversion column away from the anchoring column and stops, the new catenary is manually passed through the special pulley pre-installed above the flat wrist arm that suspends the old catenary, and the old catenary tension is manually unloaded using a lever hoist. After the new catenary is manually tightened in place, it is connected to the new compensation device on the anchoring side for anchoring; when the anchoring side is closed, the constant tension pay-off vehicle passes The line is stopped at 10 meters after the anchor column. The new contact line tension is adjusted to 15KN by the constant tension pay-off vehicle. The old contact line tension is manually unloaded using a lever hoist. The terminal wire clamp is installed using the working platform and connected to the new compensation device on the anchoring side for anchoring. The load-bearing cable pay-off vehicle stops 10 meters after passing the anchor column. The new load-bearing cable is broken from the wire drum. The new load-bearing cable is manually passed through the working support cable and pulled to the new compensation device on the anchoring side. The line is tightened manually, and the weight string on the anchoring side is lifted by force. The line tightening on the anchoring side is stopped, and the new load-bearing cable is connected to the new compensation device on the anchoring side for anchoring. Before anchoring, the tension of the old load-bearing cable is also unloaded first, and then the new load-bearing cable is anchored.

[0048] Taking a passenger dedicated line catenary overhaul project as an example, the specific construction method of this application is explained:

[0049] The construction content includes: replacement of the supporting conductor, replacement of the suspension string, replacement of the compensation device, etc. The design tension of the new supporting conductor is 15KN+15KN; the tension of the old conductor is 15KN+15KN. The compensation device is a compensation pulley. The transmission ratio of the supporting conductor is 1:3. The existing cable-stayed foundation 8 is designed to withstand a maximum tension of 45KN. The specific construction process is shown in Figure 1:

[0050] S1. Pre-construction preparation: mainly includes:

[0051] Data measurement includes the height of the supporting cable positioning points, the outer rail superelevation, the distance between each positioning point, etc. The catenary calculation uses a dedicated contact network calculation software, and the prefabrication is completed using a dedicated prefabrication platform for the hanging string. During the construction, a dedicated person is assigned to mark the installation position of the hanging wire on the rail with a marker;

[0052] On-site investigation, according to the schematic diagram of the line replacement plan (Figure 2), the lifting and landing anchor sides are all closed, and the line threading path is determined;

[0053] After checking the reel and confirming that the length is correct, hoist it onto the constant tension pay-off vehicle and the load-bearing cable pay-off vehicle, and use wire rope, wheel bolts, and wire clips to fasten it in an eight-shaped manner on all four sides of the pay-off frame;

[0054] The railcar marshaling is based on the principle of first laying the contact wire and then laying the catenary cables. The marshaling is as shown in Figure 3: constant tension pay-off car (front car) + work car + catenary cable pay-off car + work car (rear car);

[0055] S2. Anchoring and setting up lines:

[0056] S2.1. Preparation before weighing anchor:

[0057] After the power outage order is issued and the on-site person in charge notifies that pole operations can be carried out, people will go up to each positioning point and hang a wire-laying pulley under the load-bearing cable seat to prepare for the deployment and hanging of the new load-bearing cable. The anti-positioning tube will be lifted up and tied to the inclined wrist arm tube with iron wire to prevent the constant tension wire-laying vehicle from scraping against the wire-laying column when deploying the wire. According to the line conditions, when anchoring in the area, a special pulley must be installed above the non-supported raised flat wrist arm head to facilitate the anchoring and stringing of the new load-bearing cable.

[0058] Install a 1.5T pulley on each side of the old bearing and wire anchor angle steel in the field, pass the two auxiliary ropes 1 through the two pulleys respectively, and connect them to the hand-operated hoist. Connect the wire rope sleeve on the other side of the hand-operated hoist, and connect the wire rope sleeve to the U-shaped ring to complete the connection between the auxiliary rope 1 and the wire base 8 (Figure 4); Use the tensioner 4 on the other side of the auxiliary rope 1 to connect to the old wire rope, and tighten the auxiliary rope 1 with the hand-operated hoist on the side of the wire base 8 to make the auxiliary rope 1 bear force and compensate for the droop of the pulley. At this time, the tension of the old wire rope has turned Move it to the auxiliary rope 1; at the same time, use another hand hoist to lift the old weight string 5, remove the old weight string 5, compensation pulley and insulator; after the auxiliary ropes 1 on both sides of the lifting and lowering anchor are simultaneously stressed, in addition to removing the old weight string 5, the old middle anchor is also removed and a new middle anchor is installed, that is, the middle anchor can be replaced after the old bearing wire 2 is poured onto the auxiliary rope 1; simultaneously, the old contact wire is removed from the positioning wire clamp of the old middle anchor and fixed with iron wire, and the old bearing wire is poured out from the bearing wire seat and temporarily hung on the side of the flat wrist arm close to the support 6;

[0059] S2.2, temporary anchoring and stringing;

[0060] First, temporarily anchor the new contact line. According to the schematic diagram of line replacement (Figure 2), the anchoring side is closed. The constant tension pay-off vehicle stops at the conversion column near the anchoring anchor column. The tension disk rotates to bring out the new contact line. The new contact line surface is manually checked. After confirming that there is no error, the straightener and the wire-pulling column are aligned. The new contact line passes through the straightener and the wire-pulling column, passes above the working branch contact line, and is pulled to the anchoring anchor column. The terminal wire clamp is installed on the new contact line head and connected to the old double-ring rod. The temporary hard anchor is lifted; the constant tension pay-off vehicle adjusts the tension through the tension disk. The tension is increased to 7KN, the driving speed is 5KM / h, and it drives towards the anchoring side at a constant speed. The wire-pulling column is controlled by a dedicated person. Adjust the horizontal line direction and height of the wire-drawing column according to the running path of the wire; after the constant tension wire-drawing vehicle drives out of the joint, the load-bearing wire-drawing vehicle stops at the conversion column near the anchor post, and the wire is manually pulled through the top of the working support wire and temporarily anchored at the anchor post. The connection method is the same as the temporary anchoring of the new contact line; in case of anchoring of the load-bearing wire in the area, the new load-bearing wire is manually passed through the special pulley and then connected to the insulator for anchoring; during the deployment of the new load-bearing wire, a ladder car follows behind the wire-drawing vehicle, and the personnel in the ladder car pour the deployed new load-bearing wire into the wire-drawing pulley pre-installed under the flat wrist arm to prevent the load-bearing wire from falling to the ground, rubbing against the rail hooks, etc., which may cause damage to the wire;

[0061] S3. Replacement of compensation device:

[0062] First, install the anchor angle steel. The installation height of the anchor angle steel is 7500mm above the rail surface, and the wire anchor angle steel is 6200mm above the rail surface. After adjusting the a value of the compensation pulley, use the steel wire clamp to clamp the two compensation ropes on the upper part of the movable and fixed pulleys to prevent the pulleys from sliding and prevent the distance between the movable and fixed pulleys from changing during the pulley installation process. Install the compensation pulley, pestle ring rod, and insulator. Ground workers align the weight string on the weight rod, connect the weight rod to the compensation rope, and use a hand hoist to lift the weight string to a height equal to the design b value of the compensation pulley + the initial elongation of the new supporting wire.

[0063] After the new compensating pulley and the weight string are installed, the new supporting wire is poured onto the new compensating pulley on the anchoring side. The new contact wire is connected first, and the wire sleeve is put on the pillar 6, and the hand hoist is connected. The hand hoist is connected to the tensioner 4 and connected to the new contact wire. The new contact wire is tightened by the hand hoist. After the old double-ring rod is drooped, the tensioning is stopped, and the terminal wire clamp and the connection between the old double-ring rod are opened. The new contact wire is aligned with the single ear at the end of the new insulator, and a mark is made on the new contact wire. The length of the return is reserved, the terminal wire clamp is reinstalled after the wire is broken, and the connection with the new insulator is completed to officially anchor. At the same time, the steel wire clip between the moving and fixed pulleys is opened to make the pulley transmission flexible. The operation of pouring the new bearing wire onto the new compensating pulley on the anchoring side is the same as that of the new contact wire.

[0064] S4. Anchoring of the supporting conductor:

[0065] According to the schematic diagram of line replacement plan 2, the anchoring side is closed, and the new contact line is anchored first; the constant tension pay-off vehicle moves to the anchoring column and stops, and the old contact lines on both sides of the lifting and lowering anchors are first loosened using the hand winch at the wire pulling foundation 8 to unload the tension of the old contact lines. The tension of the constant tension pay-off vehicle is increased to the design value of 15KN, and the new contact line is moved to the anchoring column using the wire shifting column. The personnel on the working platform mark the alignment of the new contact line and the single ear at the end of the new insulator, and reserve a length of 500mm. The terminal wire clamp is installed after the wire is connected to the new insulator. The steel wire clip between the moving and fixed pulleys is opened to make the pulley transmission flexible, and the hand winch that fixes the new contact line weight string is loosened to make the new weight string bear force. The constant tension pay-off vehicle loosens the tension and moves forward. After the new contact line is anchored, the a and b values ​​of the new compensation pulley on the anchoring side are adjusted. After the parameters meet the requirements, the new contact line is poured into the positioning wire clamp, and the new contact line center anchor rope is installed.

[0066] After the new contact line is anchored, both sides begin to unload the tension of the old bearing cable. The bearing cable pay-off vehicle stops and cuts the line 10 meters behind the anchor column. A pulley is hung on the field side of the top of the anchor column, and a large rope is passed through the pulley to connect the tensioner 4. The other side of the tensioner 4 is connected to the cut new bearing cable. The new bearing cable is tightened by manual pulling. After the anchoring side observes that the bearing cable drop weight string has risen 200mm, the anchoring side stops pulling the wire, and people on the working platform install the terminal wire clamp at the alignment mark of the new bearing cable and the insulator, connect it to the new insulator and anchor it; at the same time, open the steel wire clip between the moving and fixed pulleys to make the pulley transmission flexible, loosen the hand hoist that fixes the new bearing cable drop weight string, and make the new drop weight string bear force; after the new bearing cable is anchored, the special S hook 7 at each positioning point is poured onto the new bearing cable, adjust the a and b values ​​of the new compensation pulley on the anchoring side, and the new bearing cable is poured into the bearing cable seat;

[0067] S5. Remove the old wire: After the new line is anchored, the old supporting wire 2 with tension removed can be removed. Use the tensioner 4 and the hand winch to tighten the wire on both sides of the break point at the middle anchor position. After the wire is broken, use a large rope to slowly lower the wire to the ground.

[0068] S6, installation of hanging strings, electrical connection lines, and contact network adjustment; after installation of hanging strings, removal of special S hook 7;

[0069] After the old line is dismantled, the droppers are installed according to the dropper positions marked on the rails in advance. After the droppers are installed, the surveyors re-measure the contact network, adjust the contact network, and record the data. The two adjacent anchor sections at the joint are both newly replaced contact networks. New electrical connecting lines are installed at this joint. Finally, a cold sliding test is carried out, the site is cleaned, and the conditions for opening are confirmed together with the equipment management unit.

[0070] The traditional method of replacing a single wire is to replace the load-bearing wire with one skylight and the contact wire with the next skylight. Generally, one skylight takes 120 minutes, the effective construction time is about 90 minutes, and the total effective construction time of the two skylights is about 180 minutes, which wastes about 60 minutes. The present application uses one skylight to replace the load-bearing wire at the same time. Although the skylight time is slightly longer, about 240 minutes, the effective construction time is 210 minutes. The skylight utilization efficiency is higher than the single-wire replacement construction method. The present application uses constant tension wire laying to improve the quality of the wire laying, and through the optimized design of the process steps, it ensures that the support 6 and the wire base 8 are safe in the force during the wire replacement process, effectively avoiding safety hazards such as overload.

Claims

1. A construction method for simultaneously replacing the entire anchor section of the contact network of a passenger dedicated line, characterized in that: include: S1. Preliminary preparation for construction: marshaling of rail cars, and placement of catenary cable drums and contact wire drums on the marshaled rail cars; S2. Anchoring and setting up lines: First, install two sets of auxiliary ropes on the anchoring side, and use the auxiliary ropes to lower the old supporting wire to the guying foundation and fix it; use the auxiliary ropes to tighten the old supporting wire to loosen the old supporting wire compensation device, and at the same time use a hand hoist to first lift the old sinker string, and then remove the old sinker string; the anchoring side and the anchoring side are carried out simultaneously, and the construction method is the same as the anchoring side; if needed, hang a wire pulley under the horizontal wrist arm load-bearing cable seat to prepare for the load-bearing cable to be deployed and hung; The new contact wire is temporarily anchored using a railcar, and the new contact wire is deployed and suspended from the old catenary using a special S-hook. The new catenary is then temporarily anchored using the same method as the new contact wire. The new catenary is deployed and suspended below the flat arm catenary cable seat using a pay-out pulley. S3. Replacement of compensation device: After the supporting conductor is temporarily anchored, during the line payout process, the old compensating device, anchor angle steel, and limiting frame, which have been relieved of tension, are removed from both sides of the anchoring and lowering. The new supporting conductor anchor angle steel, limiting frame, compensating device, and sinker string are installed. First, the new contact wire is tilted onto the new compensating device on the anchoring side to complete the formal anchoring. Then, the new load-bearing cable is tilted onto the new compensating device on the anchoring side to complete the formal anchoring. S4. Anchoring of the supporting conductor: After the compensation device is replaced, the new contact wire is anchored first. Before anchoring, the old contact wire is unloaded using the lever hoist on the auxiliary cable. The railcar adjusts the tension of the anchor to 15kN. The new contact wire is connected to the new compensation device on the anchoring side, and then the new catenary is anchored. After the new catenary is anchored, the new catenary is placed in the catenary seat, and the special S-hook for hanging the new contact wire is placed on the new catenary. S5. Removal of old conductor: After the new conductor is anchored, the old conductor is cut at the middle anchor and the old conductor is slowly lowered to the ground with a large rope. S6, installation of droppers, electrical connection lines, and contact network adjustment; In step S2, when installing the auxiliary rope, a guide pulley is installed on each side of the field of the old supporting wire anchor angle steel, and one end of the two auxiliary ropes is passed through the two guide pulleys respectively and connected to the hand-operated hoist, and the other end of the hand-operated hoist is connected to the wire base; the other end of the auxiliary rope is connected to the old supporting wire using a tensioner.

2. The construction method for simultaneously replacing the entire anchor section of the contact network of a passenger dedicated line according to claim 1 is characterized in that: In step S1, the railcar marshaling is carried out according to the principle of first setting up the contact wire and then setting up the catenary wire, and the marshaling is as follows: constant tension pay-off car (front car) + working car + catenary wire pay-off car + working car (rear car).

3. The construction method for simultaneously replacing the entire anchor section of the contact network of a passenger dedicated line according to claim 1 is characterized in that: In step S2, the new contact line anchoring and stringing tension is 7KN, and the stringing speed is 5km / h; the new carrier cable anchoring and stringing tension is 3KN-5KN, and the stringing speed is 3-5km / h; and the constant tension wire-laying vehicle for laying out the contact line is in front, and the carrier cable wire-laying vehicle is at least 100 meters behind at a safe distance.

4. The construction method for simultaneously replacing the entire anchor section of the passenger dedicated line overhead contact wire according to claim 1 is characterized in that: Step S2: During the deployment of the new contact wire, a dedicated person on the rail vehicle will hang the upper end of the prefabricated special S-hook on the old load-bearing cable, and drag the new contact wire with the lower end to ensure the smoothness of the new contact wire during the deployment process. A 1-meter special S-hook is used on both sides of each pillar, and 2 0.8-meter S-hooks are evenly arranged in the span, with 4 special S-hooks arranged in each span; during the deployment of the new load-bearing cable, a dedicated person on the rail vehicle will pour the deployed new load-bearing cable into the wire-laying pulley pre-installed under the flat wrist arm.

5. The construction method for simultaneously replacing the entire anchor section of the passenger dedicated line overhead contact wire according to claim 1 is characterized in that: In step S3, the new weight string is lifted to the height of the compensation device design b value + the initial extension of the new supporting wire using a hand hoist, and the pulley spacing is adjusted to the compensation device design a value and sealed to prevent the pulley spacing from changing; in step S4, after the new supporting wire is anchored and before the new supporting wire is poured into the supporting wire seat, the a and b values of the compensation device are remeasured and adjusted.

6. The construction method for simultaneously replacing the entire anchor section of the overhead contact wire of a passenger dedicated line according to claim 5 is characterized in that: During the installation of the new compensation device, the values of a and b may change. After the new supporting conductor is connected to the new compensation device to form a formal lifting and lowering anchor, the value of b can be achieved by adjusting the length of the compensation rope to meet the design requirements. The pulley spacing a value can be adjusted first, and the two upper compensation ropes between the movable and fixed pulleys can be clamped and fixed with steel wire clips to ensure that the value of a remains unchanged. After the new supporting conductor is connected to the new compensation device, the steel wire clips can be removed to ensure that the pulley moves flexibly. Adjustments can also be made through other means to ensure that the compensation device parameters are in place at one time after the formal anchoring is formed.

7. The construction method for simultaneously replacing the entire anchor section of the contact network of a passenger dedicated line according to claim 2 is characterized in that: In step 2, after the auxiliary cables on both sides of the lifting and lowering anchors are simultaneously stressed, in addition to removing the old weight string, the old middle anchor is also removed and a new middle anchor is installed.

8. The construction method for simultaneously replacing the entire anchor section of the passenger dedicated line overhead contact wire according to claim 2 is characterized in that: When the anchoring side is open, the new contact line is temporarily anchored, the constant tension pay-off vehicle stops at the conversion column near the anchoring anchor column, the new contact line passes through the working support contact line near the pillar side, the constant tension pay-off vehicle loosens the line, manually pulls the contact line to the anchoring anchor column, and temporarily uses a hard anchor to anchor and start stringing; when the new bearing cable is anchored, the pay-off vehicle runs to the conversion column away from the anchoring anchor column, manually pulls the line through the special pulley pre-installed on the flat wrist arm, and temporarily uses a hard anchor to anchor at the anchoring anchor column to start stringing; when the anchoring side is closed, the constant tension pay-off vehicle and the bearing cable pay-off vehicle both stop at the conversion column near the anchoring anchor column, the new contact line is manually pulled, passes above the working support contact line, and is temporarily anchored at the anchoring anchor column using a hard anchor, the new bearing cable passes above the working supporting cable, and is temporarily anchored at the anchoring anchor column using a hard anchor.

9. The construction method for simultaneously replacing the entire anchor section of the overhead contact wire of a passenger dedicated line according to claim 2, characterized in that: In step S4, when the anchoring side is open, the constant tension pay-off vehicle stops at a position of 10 meters after the anchoring column, and the new contact line is adjusted to 15KN by the constant tension pay-off vehicle. The old contact line tension is manually unloaded using a lever hoist, and the terminal wire clamp is installed using the working platform to connect the new compensation device on the anchoring side to drop the anchor; the bearing cable pay-off vehicle moves to a position away from the conversion column of the anchoring column and stops. The new bearing cable is manually passed through the special pulley pre-installed above the flat wrist arm that suspends the old bearing cable, and the old bearing cable tension is manually unloaded using a lever hoist. After the new bearing cable is manually tightened in place, it is connected to the new compensation device on the anchoring side to drop the anchor; when the anchoring side is closed, the constant tension pay-off vehicle passes the anchoring column and stops. The line is stopped at 10 meters after the anchor column. The new contact line tension is adjusted to 15KN by the constant tension pay-off vehicle. The old contact line tension is manually unloaded using a lever hoist. The terminal wire clamp is installed using the working platform and connected to the new compensation device on the anchoring side for anchoring. The load-bearing cable pay-off vehicle stops at 10 meters after passing the anchor column. The new load-bearing cable is broken from the wire drum. The new load-bearing cable is manually passed through the working support cable and pulled to the new compensation device for anchoring. The line is tightened manually, and the weight string on the anchoring side is lifted by force. The line tightening on the anchoring side is stopped, and the new load-bearing cable is connected to the new compensation device on the anchoring side for anchoring. Before anchoring, the tension of the old load-bearing cable is also unloaded before anchoring the new load-bearing cable.

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