A method for quickly replacing failed turnout sleeper in high-speed railway operation period

Abstract

The application discloses a kind of suitable for high-speed railway operation period failure turnout sleeper quick replacement method, comprising the following steps: first, using ballastless track bed concrete breaking device to break the concrete around the failure turnout sleeper track bed;Then the internal reinforcement of track bed is cut off, replaced or reserved in situ;Next, the bottom truss of failure turnout sleeper is separated from the track bed concrete, the failure turnout sleeper is removed, after reinstalling effective turnout sleeper, the internal reinforcement of track bed is arranged after fine adjustment positioning of effective turnout sleeper, and steel bar insulation test is carried out;Finally, the replacement material of track bed concrete is recast.The application can complete single turnout sleeper quick replacement in 4h conventional skylight time, and the application has the advantages of less skylight occupation, less damage to existing ballastless track structure, high structural stability, safety and small risk.

Description

Technical Field

[0001] This invention relates to the field of turnout sleeper replacement technology, and more specifically to a method for rapid replacement of failed turnout sleepers during the operation of high-speed railways. Background Technology

[0002] Ballastless track structures are a common track structure form in high-speed railway mainlines and turnout areas. With the large-scale construction and operation of high-speed railways, the application of ballastless track structures in turnout areas has accumulated a wealth of operational and practical experience. Turnouts are the weakest link in the high-speed railway track structure and a key device limiting train speed. Furthermore, due to their complex structure and strong wheel-rail interaction, they are prone to various defects, making them a key focus and challenge in railway maintenance. As an important component of the turnout structure, the condition of concrete turnout sleepers in high-speed railways has a significant impact on the entire turnout system.

[0003] Concrete turnout sleepers are important components in the embedded ballastless track structure of the turnout area. On the one hand, they transfer the train load borne by the turnout rail components to the underlying foundation; on the other hand, they maintain the track geometry, including gauge, direction, and elevation, in the turnout area. Due to the complex track alignment and wheel-rail interaction in the turnout area, the stress characteristics and structural design of turnout sleepers are more complex than those of mainline sleepers.

[0004] Turnout sleepers are a critical structural component of ballastless track turnouts, and severe damage to them can compromise the durability and stability of the turnout's load-bearing capacity, necessitating timely replacement. Existing ballastless turnout defect remediation technologies primarily target defects such as poor connection between the turnout and adjacent tracks, exceeding track direction and elevation limits, turnout mud pumping, and incorrect track alignment. In-depth research has been conducted on the causes of these defects and their remedial measures.

[0005] In the existing technology, certain research results have been achieved for the replacement of prestressed concrete sleepers for ballasted tracks and sleepers for double-block ballastless tracks. For example, CN103161104A discloses a sleeper replacement device and method, which uses a ballast pusher plate that is inserted into the rail to a certain depth to push the ballast, mainly solving the technical problem of low ballast removal efficiency during sleeper replacement, and is only applicable to the replacement of sleepers for ballasted tracks; CN102261024 discloses a sleeper quick replacement machine, which uses a grab bucket stone removal device and a rotary drilling mechanism to clean the ballast bed and a rail lifting and sleeper replacement mechanism to replace sleepers, and is applicable to the replacement of sleepers for ballasted tracks; CN115404731A discloses a construction method for quickly replacing double-block sleepers during a track maintenance window, which utilizes the track maintenance window (7 hours) for construction, with each cycle lasting two days, and the construction is completed in 1 day. The section ballast slab is not suitable for replacing embedded turnout sleepers under the conventional 4-hour track window during operation, as the construction process is more complex. CN111733639A discloses a method for replacing damaged sleepers in ballastless track. This method uses high-pressure water jet technology to break up the ballast around the sleeper. It is difficult to miniaturize the equipment and requires a high-pressure water pump, water storage car, and high-power generator. At the same time, the efficiency of concrete breaking is low, and it requires two track windows to complete the replacement of one sleeper. CN100543228C discloses a construction process and equipment for replacing railway turnouts. This technology is suitable for replacing the rail section of the entire turnout, but not for replacing embedded turnout sleepers.

[0006] In summary, due to the significant unique characteristics of the design, production, construction, and service environment of embedded turnout sleepers in ballastless track, the turnout area where these sleepers are located involves long, movable rail components, the upper area is obscured by the rails, there are many precision devices such as trackside detectors and switches, the bottom truss reinforcement of the sleepers is dense, and the track structure requires high precision. These characteristics make them significantly different from ballasted track sleepers and turnout sleepers in terms of structural design. Furthermore, the existing replacement methods for double-block sleepers are not applicable to the replacement of embedded turnout sleepers in ballastless track. Therefore, turnout sleeper replacement technology in ballastless track, especially during the operation of high-speed railways, remains a gap.

[0007] Therefore, providing a method for the rapid replacement of failed turnout sleepers during the operation of high-speed railways is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a method for rapid replacement of failed turnout sleepers during the operation of high-speed railways, which can be completed within a normal 4-hour maintenance window during the operation period, and has high safety and stability.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways includes the following steps: First, a ballastless track bed concrete crushing device is used to break up the track bed concrete around the failed turnout sleeper; then, the internal reinforcing bars of the track bed are cut off, replaced, or retained in situ; next, the bottom truss reinforcement of the failed turnout sleeper is separated from the track bed concrete, the failed turnout sleeper is removed, a valid turnout sleeper is reinstalled, the valid turnout sleeper is finely positioned and the internal reinforcing bars of the track bed are arranged, and the insulation of the reinforcing bars is tested; finally, the track bed concrete is re-poured to replace the materials.

[0011] Furthermore, the ballastless track concrete breaking device is one or more of the following: electric hammer, pneumatic hammer, hydraulic breaker, and high-pressure water jet device.

[0012] Furthermore, the transverse boundary of the concrete slab around the failed turnout sleeper is to be broken down to the adjacent turnout sleeper, and the longitudinal boundary is to be broken down along the edge of the adjacent intact turnout sleeper to the bottom of the failed turnout sleeper, with a breaking depth of 180-200mm.

[0013] Furthermore, the internal reinforcement treatment process of the track bed is as follows: cut off the φ18 longitudinal reinforcement on the shoulder side with a cutting length of 300-380mm, then remove and replace the φ18 transverse reinforcement on both sides, and retain the φ12 U-shaped reinforcement and the φ18 longitudinal reinforcement on the inter-line side in their original positions.

[0014] Further, the process of separating the bottom truss reinforcement of the failed turnout sleeper from the track bed concrete is as follows: First, remove the fasteners within the range of 10 turnout sleepers before and after the failed turnout sleeper. Then, lift the rail by 10-30mm and remove the bottom pad of the failed turnout sleeper. Next, evenly install 3 hydraulic jacks on the side of the failed turnout sleeper. Use square timber to isolate the hydraulic jacks from the adjacent turnout sleepers. Use the lifting force to push longitudinally to separate the failed turnout sleeper from the bottom track bed concrete.

[0015] Further, the process of removing the faulty turnout sleeper: the faulty turnout sleeper is pulled out from the bottom of the rail on the shoulder side by a hydraulic traction device and transported off the track; the process of reinstalling the valid turnout sleeper: the valid turnout sleeper is inserted into the cleaned turnout sleeper groove from the bottom of the rail on the shoulder side by a hydraulic traction device.

[0016] Further, the fine-tuning and positioning process of the turnout sleepers: Place and coarsely adjust the turnout sleepers according to the marked relative positions to ensure that the relative deviation of the distance between the front and rear turnout sleepers is within ±5mm and the relative deviation of the lateral position of the turnout sleepers is within ±2mm; the horizontal position of the turnout sleepers is adjusted by a level, and the height is adjusted by installing height adjustment screws at both ends of the turnout sleepers. After fine-tuning, fix the position of the turnout sleepers.

[0017] Further, the process of arranging the internal reinforcement of the track bed is as follows: the φ18 transverse reinforcement of the track bed slab is insulated and connected with the φ12 U-shaped reinforcement; the original φ18 longitudinal reinforcement cut off on the shoulder side is lapped and welded on one side using the same type of reinforcement, with a lap weld length of 100-200mm; the longitudinal reinforcement of the track bed slab and the truss reinforcement of the turnout sleeper are connected by insulating clips, and the insulating clips are ensured to be firm.

[0018] Further, the insulation testing process for the reinforcing bars is as follows: using an insulation resistance tester, the insulation resistance between each exposed track bed slab reinforcing bar and the sleeper reinforcing bar is tested under a measurement voltage of 500V. During the test, the longitudinal reinforcing bars are used as the measurement reference bars to check whether the resistance between the sleeper reinforcing bars and each longitudinal reinforcing bar is qualified. If the test resistance is ≥2MΩ, the insulation performance meets the requirements; otherwise, the cause is investigated and dealt with until the insulation performance between each reinforcing bar meets the requirements.

[0019] Furthermore, the replacement material for the re-poured track bed concrete is one or more of polymer early-strength concrete, polymer early-strength mortar, and epoxy resin mortar. The bond strength of the replacement material for the track bed concrete is ≥1.5MPa, and the compressive strength after 1 hour is ≥10MPa.

[0020] Therefore, this invention provides a rapid replacement method for failed turnout sleepers during the operation of high-speed railways. Compared with the prior art, this invention has the following advantages:

[0021] (1) A single turnout sleeper can be replaced within the 4-hour window during the operation period, which minimizes the window occupation and has little impact on operation;

[0022] (2) The construction process for replacing turnout sleepers is closely linked, causing little damage to the existing ballastless track structure and resulting in high structural stability;

[0023] (3) The ballastless track bed concrete breaking device used can complete the removal of track bed concrete around a single turnout sleeper within 90 minutes, with high treatment efficiency.

[0024] (4) A technology for separating the bottom truss reinforcement of the turnout sleeper from the track bed concrete based on longitudinal jacking was proposed, which realized the rapid separation of the failed turnout sleeper from the track bed concrete.

[0025] (5) The ballastless track bed concrete replacement material has good workability, high interfacial bond strength, early mechanical properties that meet the requirements for traffic opening, and can reach the strength required for traffic operation within 1 hour after pouring.

[0026] (6) No track closure construction is required. During the replacement process, multiple safety measures such as the three-dimensional reinforcement device for turnout sleepers can be used to reinforce the track, ensuring the stability of the ballastless track structure in the turnout area, with low safety and risk. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 The attached figure is a Gantt chart showing the construction progress of a method for replacing a failed turnout sleeper during the construction period of a high-speed railway, as described in Example 1.

[0029] Figure 2 The attached figure is a Gantt chart showing the progress of track bed removal in Comparative Example 1.

[0030] Figure 3 The attached diagram shows the progress of the turnout sleeper replacement construction in Comparative Example 1. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] like Figure 1As shown, this embodiment of the invention provides a method for quickly replacing failed turnout sleepers during the operation of a high-speed railway, including the following steps: First, a hydraulic breaker and an electric breaker with an impact energy of not less than 55J are used to break up the ballast concrete around the failed turnout sleeper. The lateral boundary of the ballast concrete breaking range extends to the adjacent turnout sleeper, and the longitudinal boundary is defined by the side elevation of the ballast slab, breaking along the edge of the adjacent intact turnout sleeper to the bottom of the sleeper, with a breaking depth of 190mm; then, the internal reinforcement of the ballast is treated: the φ18 longitudinal reinforcement on the shoulder side is cut off with a cutting length of 380mm, and the φ18 transverse reinforcement on both sides is removed and replaced with new φ12 U-shaped reinforcement and the original φ18 longitudinal reinforcement on the track side. The position is retained; next, the fasteners within 10 sleepers before and after the failed sleeper are removed, the rail is raised by 10mm, the bottom pad of the failed sleeper is removed, and then 3 hydraulic jacks are evenly installed on the side of the failed sleeper. Square timber is used to separate the hydraulic jacks from adjacent sleepers. The failed sleeper is then separated from the bottom of the track bed concrete by longitudinal jacking using the lifting force. The failed sleeper is then pulled out from the bottom of the rail on the shoulder side using a hydraulic traction device. After removing the failed sleeper, a valid sleeper of the same type (new sleeper) is inserted into the cleaned sleeper slot from the bottom of the rail on the shoulder side using a hydraulic traction device. After reinstalling the new sleeper, proceed according to the marked relative positions of the sleepers. Placement and coarse adjustment are performed to ensure that the relative deviation of the distance between the front and rear turnout sleepers is within ±5mm, and the relative deviation of the lateral position of the sleepers is within ±2mm. The level of the sleepers is controlled with a spirit level, and the height is finely adjusted by installing height adjustment screws at both ends of the sleepers. After fine adjustment, the position of the sleepers is fixed. The internal reinforcement of the track bed is arranged according to the original design, with the φ18 transverse reinforcement of the track bed slab insulated and connected to the φ12 U-shaped reinforcement. The original φ18 longitudinal reinforcement cut off on the shoulder side is replaced with the same type of reinforcement and lapped and welded on one side, with a lap weld length of 100mm. The longitudinal reinforcement of the track bed slab and the truss reinforcement of the turnout sleepers are insulated with insulating clips to ensure that the insulating clips are firm, and the reinforcement is then reinforced. Insulation testing was conducted using an insulation resistance tester at a measurement voltage of 500V. The insulation resistance between each exposed track bed slab reinforcement and the sleeper reinforcement was tested, with the longitudinal reinforcement used as the reference reinforcement. The resistance between the sleeper reinforcement and each longitudinal reinforcement was checked to see if it met the requirements. If the test resistance was ≥2MΩ, the insulation performance met the requirements; otherwise, the cause was investigated and addressed until the insulation performance between each reinforcement met the requirements. Finally, polymer early-strength concrete with a bond strength of 2.8MPa and a 1-hour compressive strength of 16.0MPa was used as the replacement material for the track bed concrete, and the track bed was re-poured to achieve rapid replacement of the failed turnout sleepers.

[0034] Example 2:

[0035] This invention discloses a method for quickly replacing failed turnout sleepers during the operation of a high-speed railway, comprising the following steps: First, using a hydraulic breaker and a pneumatic hammer with an impact energy of not less than 55J, the concrete of the track bed around the failed turnout sleeper is broken. The lateral boundary of the concrete breaking range extends to the adjacent turnout sleeper, and the longitudinal boundary is defined by the side elevation of the track bed slab, breaking along the edge of the adjacent intact turnout sleeper to the bottom of the sleeper, with a breaking depth of 180mm; then, the internal reinforcement of the track bed is treated: the φ18 longitudinal reinforcement on the shoulder side is cut off with a cutting length of 350mm, the φ18 transverse reinforcement on both sides is removed and replaced, and the original φ12 U-shaped reinforcement and the φ18 longitudinal reinforcement on the track side are removed. The position is retained; next, the fasteners within 10 sleepers before and after the failed sleeper are removed, the rail is lifted 20mm, the bottom pad of the failed sleeper is removed, and then 3 hydraulic jacks are evenly installed on the side of the failed sleeper. The hydraulic jacks are separated from the adjacent sleepers by square timber. The lifting force is used to longitudinally push the failed sleeper to separate it from the bottom of the track bed concrete. The failed sleeper is pulled out from the bottom of the rail on the shoulder side by a hydraulic traction device. After removing the failed sleeper, a new sleeper of the same model is inserted into the cleaned sleeper slot from the bottom of the rail on the shoulder side by a hydraulic traction device. After reinstalling the new sleeper, it is placed according to the marked relative position of the sleeper. Coarse adjustment is performed to ensure that the relative deviation of the distance between the front and rear turnout sleepers is within ±5mm, and the relative deviation of the lateral position of the sleepers is within ±2mm. The level of the sleepers is controlled using a spirit level, and the height is adjusted by installing height adjustment screws at both ends of the sleepers. Fine adjustment is performed to ensure the elevation and level of the sleepers. After fine adjustment, the position of the sleepers is fixed. The internal reinforcement of the track bed is arranged according to the original design, and the φ18 transverse reinforcement of the track bed slab is insulated and connected to the φ12 U-shaped reinforcement. The original φ18 longitudinal reinforcement cut off on the shoulder side is replaced with the same type of reinforcement and lapped and welded on one side. The lap weld length is 150mm. The longitudinal reinforcement of the track bed slab and the truss reinforcement of the sleepers are insulated with insulating clips to ensure that the insulating clips are firm and the reinforcement is insulated. Insulation testing was conducted using an insulation resistance tester at a measurement voltage of 500V to test the insulation resistance between each exposed track bed slab reinforcement and the sleeper reinforcement. During the test, the longitudinal reinforcement was used as the measurement reference reinforcement to check whether the resistance between the sleeper reinforcement and each longitudinal reinforcement was qualified. If the test resistance was ≥2MΩ, the insulation performance met the requirements; otherwise, the cause was investigated and dealt with until the insulation performance between each reinforcement met the requirements. Finally, polymer early-strength mortar with a bond strength of 3.2MPa and a 1-hour compressive strength of 14.2MPa was used as the replacement material for the track bed concrete to recast the track bed, realizing the rapid replacement of the failed turnout sleepers.

[0036] Example 3:

[0037] This invention discloses a method for quickly replacing failed turnout sleepers during the operation of a high-speed railway, comprising the following steps: First, a hydraulic breaker with an impact energy of not less than 55J and a high-pressure water jet device are used to break up the ballast concrete around the failed turnout sleeper. The lateral boundary of the ballast concrete breaking range extends to the adjacent turnout sleeper, and the longitudinal boundary is defined by the side elevation of the ballast slab, breaking along the edge of the adjacent intact turnout sleeper to the bottom of the sleeper, with a breaking depth of 200mm; then, the internal reinforcement of the ballast is treated: the φ18 longitudinal reinforcement on the shoulder side is cut off with a cutting length of 300mm, the φ18 transverse reinforcement on both sides is removed and replaced, and the φ12 U-shaped reinforcement and the φ1... 8. The longitudinal reinforcement bars are retained in their original positions. Next, the fasteners within 10 sections of the failed turnout sleeper are removed, the rail is raised by 30mm, the bottom pad of the failed turnout sleeper is removed, and then 3 hydraulic jacks are evenly installed on the side of the failed turnout sleeper. The hydraulic jacks are separated from the adjacent turnout sleepers by square timber. The jacking force is used to longitudinally push the failed turnout sleeper to separate it from the bottom of the track bed concrete. The failed turnout sleeper is pulled out from the bottom of the rail on the shoulder side using a hydraulic traction device. After removing the failed turnout sleeper, a new turnout sleeper of the same model is inserted into the cleaned turnout sleeper groove from the bottom of the rail on the shoulder side using a hydraulic traction device. After reinstalling the new turnout sleeper, proceed according to the marked relative positions of the turnout sleepers. Placement and coarse adjustment are performed to ensure that the relative deviation of the distance between the front and rear turnout sleepers is within ±5mm, and the relative deviation of the lateral position of the sleepers is within ±2mm. The level of the sleepers is controlled with a spirit level, and the height is finely adjusted by installing height adjustment screws at both ends of the sleepers. After fine adjustment, the position of the sleepers is fixed. The internal reinforcement of the track bed is arranged according to the original design, with the φ18 transverse reinforcement of the track bed slab insulated and connected to the φ12 U-shaped reinforcement. The original φ18 longitudinal reinforcement cut off on the shoulder side is replaced with the same type of reinforcement and lapped and welded on one side, with a lap weld length of 200mm. The longitudinal reinforcement of the track bed slab and the truss reinforcement of the sleepers are insulated with insulating clips to ensure that the insulating clips are firm and steel reinforcement is installed. For the insulation test, an insulation resistance tester is used to test the insulation resistance between each exposed track bed slab reinforcement and the sleeper reinforcement under a measurement voltage of 500V. During the test, the longitudinal reinforcement is used as the measurement reference reinforcement to check whether the resistance between the sleeper reinforcement and each longitudinal reinforcement is qualified. If the test resistance is ≥2MΩ, the insulation performance meets the requirements; otherwise, the cause is investigated and dealt with until the insulation performance between each reinforcement meets the requirements. Finally, epoxy resin mortar with a bonding strength of 5.6MPa and a 1-hour compressive strength of 25.5MPa is used as the track bed concrete replacement material to recast the track bed, realizing the rapid replacement of the failed turnout sleepers.

[0038] Comparative Example 1:

[0039] like Figure 2 , 3As shown in the comparative example, this invention discloses a method for replacing failed turnout sleepers during the construction period of a high-speed railway, including the following steps: using an electric pick or pneumatic pick to break up the ballast concrete around the failed turnout sleeper, with the lateral boundary of the ballast concrete breaking area extending to the adjacent turnout sleeper, and the longitudinal boundary being the side elevation of the ballast slab, breaking along the edge of the adjacent intact turnout sleeper to the bottom of the sleeper, with a breaking depth of 190mm; then, the internal reinforcement of the ballast is processed: the φ18 longitudinal reinforcement on the shoulder side is cut off with a cutting length of 280mm, the φ18 transverse reinforcement on both sides is removed and replaced, and the φ12U... The reinforcing bars and φ18 longitudinal bars on the track sides were retained in their original positions. The failed turnout sleepers were separated from the bottom track bed concrete by vertical jacking. The failed turnout sleepers were manually pulled out from the bottom of the rails on the shoulder side. After the failed turnout sleepers were removed, new turnout sleepers of the same type were manually inserted into the track bed from the bottom of the rails on the shoulder side. After the new turnout sleepers were reinstalled, the elevation and level of the turnout sleepers were finely adjusted using a total station and track gauge. After the fine adjustment was completed, the position of the turnout sleepers was fixed. Finally, ordinary quick-setting concrete was used as the replacement material for the track bed concrete to recast the track bed, realizing the replacement of the failed turnout sleepers during the construction period.

[0040] The following table compares the technical effects of Examples 1, 2, and 3 with Comparative Example 1:

[0041]

[0042] Therefore, it can be seen that the embodiment of the present invention can complete the demolition of the track bed concrete around the turnout sleeper within 90 minutes, while Comparative Example 1 requires 180 minutes. Furthermore, the embodiment of replacing a single turnout sleeper only requires one 4-hour track window, while Comparative Example 1 requires two track windows: track bed demolition and turnout sleeper replacement. The present invention has the advantages of simple construction procedures, minimal track window occupation, and low safety risks. The replacement of a single turnout sleeper can be completed within a conventional 4-hour track window, with good results after replacement.

[0043] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways, characterized in that, Includes the following steps: First, the ballastless track bed concrete breaking device is used to break up the track bed concrete around the failed turnout sleeper; then, the internal steel bars of the track bed are cut off, replaced, or retained in place; next, the bottom truss bars of the failed turnout sleeper are separated from the track bed concrete, the failed turnout sleeper is removed, and a valid turnout sleeper is reinstalled. After the valid turnout sleeper is finely adjusted and positioned, the internal steel bars of the track bed are arranged, and the steel bar insulation test is carried out; finally, the track bed concrete is re-poured and the materials are replaced. The ballastless track concrete crushing device is one or more of the following: electric hammer, pneumatic hammer, hydraulic crusher, and high-pressure water jet device; The process of separating the bottom truss reinforcement of the failed turnout sleeper from the track bed concrete is as follows: First, remove the fasteners within the range of 10 turnout sleepers before and after the failed turnout sleeper. Then, lift the rail by 10-30mm and remove the bottom pad of the failed turnout sleeper. Next, evenly install 3 hydraulic jacks on the side of the failed turnout sleeper. Use square timber to isolate the hydraulic jacks from the adjacent turnout sleepers. Use the lifting force to push longitudinally to separate the failed turnout sleeper from the bottom track bed concrete.

2. The method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, The transverse boundary for the removal of the concrete slab around the failed turnout sleeper extends to the adjacent turnout sleeper, while the longitudinal boundary is defined by the side elevation of the slab, extending along the edge of the adjacent intact turnout sleeper to the bottom of the failed turnout sleeper, with a removal depth of 180-200mm.

3. The method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, The process of handling the internal reinforcement of the track bed is as follows: cut off the φ18 longitudinal reinforcement on the shoulder side with a cutting length of 300-380mm, then remove the φ18 transverse reinforcement on both sides and replace it with a new one, while the φ12 U-shaped reinforcement and the φ18 longitudinal reinforcement on the inter-line side are retained in their original positions.

4. A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, The process of removing the faulty turnout sleeper: The faulty turnout sleeper is pulled out from the bottom of the rail on the shoulder side by a hydraulic traction device and transported off the track; The process of reinstalling the valid turnout sleeper: The valid turnout sleeper is inserted into the cleaned turnout sleeper groove from the bottom of the rail on the shoulder side by a hydraulic traction device.

5. A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, Fine-tuning and positioning process of turnout sleepers: Place and coarsely adjust the turnout sleepers according to the marked relative positions to ensure that the relative deviation of the distance between the front and rear turnout sleepers is within ±5mm and the relative deviation of the lateral position of the turnout sleepers is within ±2mm; the horizontal position of the turnout sleepers is adjusted by a level, and the height is adjusted by installing height adjustment screws at both ends of the turnout sleepers. After fine-tuning, fix the position of the turnout sleepers.

6. A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, The process of arranging the internal reinforcement of the track bed is as follows: the φ18 transverse reinforcement of the track bed slab is insulated and connected to the φ12 U-shaped reinforcement; the original φ18 longitudinal reinforcement cut off on the shoulder side is lapped and welded on one side using the same type of reinforcement, with a lap weld length of 100-200mm; the longitudinal reinforcement of the track bed slab and the truss reinforcement of the turnout sleeper are connected by insulating clips, and the insulating clips are ensured to be firm.

7. A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, Reinforcing bar insulation testing process: Using an insulation resistance tester, the insulation resistance between each exposed track bed slab reinforcing bar and the sleeper reinforcing bar is tested under a measurement voltage of 500V. During the test, the longitudinal reinforcing bar is used as the measurement reference reinforcing bar to check whether the resistance between the sleeper reinforcing bar and each longitudinal reinforcing bar is qualified. If the test resistance is ≥2MΩ, the insulation performance meets the requirements; otherwise, the cause is investigated and dealt with until the insulation performance between each reinforcing bar meets the requirements.

8. A method for rapid replacement of failed turnout sleepers during the operation of high-speed railways according to claim 1, characterized in that, The replacement material for the re-poured track bed concrete is one or more of polymer early-strength concrete, polymer early-strength mortar, and epoxy resin mortar. The bond strength of the replacement material for the track bed concrete is ≥1.5MPa, and the compressive strength after 1 hour is ≥10MPa.

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