Method for operating maintenance of ballastless track during window period

Abstract

This invention relates to the field of railway transportation technology and provides a method for maintaining ballastless track during operational maintenance windows. The method includes the following steps: removing the concrete slab between sleepers within the maintenance area; removing the sleepers and their corresponding concrete slab within the maintenance area, replacing the removed sleepers and their corresponding concrete slab with wooden sleepers; installing a slab frame; the slab frame is a prefabricated component; the slab frame includes a template frame, a rail support platform, and a reinforcing steel frame; pouring the concrete slab into the template frame; and completing the maintenance of the ballastless track. This invention solves the problem that existing ballastless tracks require the removal of old concrete slabs when replacing track slabs, leading to obstructed track traffic; and that the work involved in removing concrete slabs, binding reinforcing steel, assembling and dismantling templates is extensive and time-consuming, easily exceeding the maintenance window period, resulting in delayed operation and economic losses within the maintenance area.

Description

Technical Field

[0001] This invention relates to the field of railway transportation technology, and in particular to a method for maintaining ballastless track during operational maintenance windows. Background Technology

[0002] In the railway transportation sector, ballastless track has been increasingly widely used due to its ease of construction and maintenance. By the end of 2022, my country's high-speed railways had laid 53,000 track kilometers of ballastless track, of which 25,986 track kilometers were double-block ballastless track, accounting for 49.5%, making it the longest-laid ballastless track type. During operation, ballastless track sometimes experiences instability in its subgrade, such as subgrade and bridge subsidence, or tunnel arching. Replacement of the ballastless track slabs is necessary to restore the track surface elevation and ensure track smoothness and reliability.

[0003] The existing ballastless track slab replacement work is generally carried out during the operation window. First, the existing track bed concrete is removed, and then steel bars are tied, formwork is assembled, and a new concrete track bed slab is poured to form a new ballastless track slab structure. However, the removal of track bed concrete is a large-scale and time-consuming operation, which can easily lead to the removal work not being completed within the operation window, resulting in the track not being able to operate on time and causing economic losses. In the construction stage of the new concrete track bed slab, the on-site steel bar tying and formwork assembly processes are time-consuming, which can also easily lead to the construction period exceeding the operation window and causing economic losses. Summary of the Invention

[0004] The purpose of this invention is to solve the problems that existing ballastless tracks require the removal of old track bed concrete when replacing ballastless track slabs, which obstructs track traffic; and that the large amount of work involved in excavating track bed concrete, binding steel bars, and assembling formwork makes it easy to miss the maintenance window, resulting in the track in the maintenance area not being able to operate on time and causing economic losses. The invention provides a method for maintaining ballastless tracks during the operation window.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for maintaining ballastless track during an operational maintenance window includes the following steps:

[0007] A. Remove the concrete between the sleepers within the maintenance area; the track after removing the concrete between the sleepers can be reopened for operation at the preset speed.

[0008] B. Remove the sleepers and corresponding sleeper track bed concrete within the maintenance area, and replace the removed sleepers and corresponding sleeper track bed concrete with wooden sleepers; the track after the wooden sleepers are installed can be reopened for operation at a preset speed.

[0009] C. Install the track bed frame; the track bed frame is a precast component; the track bed frame includes a template frame and a rail support platform; the size and shape of the template frame match the size and shape of the track bed concrete; several transverse supports are connected inside the template frame; the transverse supports are distributed at intervals along the longitudinal direction of the track, and the rail support platform is located on top of the transverse supports; a steel reinforcement frame is also connected inside the template frame; when installing the track bed frame, remove all the wooden sleepers in the corresponding area;

[0010] D. Pour the track bed concrete into the template frame; complete the maintenance of the ballastless track.

[0011] The removal work in steps A and B can take various forms, such as manual removal or removal using a special crushing vehicle; the preset speed in steps A and B depends on the specific size of the maintenance area, settlement or camber, but should be lower than the normal operating speed of the track.

[0012] In step C, the template frame of the track bed skeleton can be a permanent structure, such as serving as a new ballastless track slab structure together with the track bed concrete after the track bed concrete is poured; or it can be a temporary structure, such as being dismantled after the track bed concrete is poured; as long as it can be manufactured before step C, thus saving on-site assembly work.

[0013] The specific steps for pouring the track bed concrete in step D refer to existing technologies, such as vibrating, smoothing, and curing the concrete after pouring.

[0014] The maintenance method for ballastless track during the operation window in this plan adopts an arrangement of first removing the concrete between the sleepers and then removing the concrete from the sleepers themselves. This disperses the removal of the concrete into two steps. On the one hand, it reduces the amount of work to be done in each step, making it easier to complete the removal work within the operation window and avoiding interference with the operation of the track in the maintenance area. On the other hand, retaining the sleepers and their concrete in step A preserves some of the track's load-bearing capacity, allowing the track under maintenance to be reopened at a preset speed after step A. After removing the sleepers and their corresponding concrete in step B, wooden sleepers are used as temporary supports, allowing the track under maintenance to be reopened at a preset speed after step B as well.

[0015] In step C, this solution uses a precast track bed frame that includes a steel reinforcement skeleton, a formwork frame, transverse supports, and rail supports. Factory prefabrication eliminates the need for on-site adjustments to rail support spacing, steel reinforcement binding, formwork assembly, and formwork dismantling. This makes steps C and D, i.e., the construction of the new track bed concrete, easier to complete within the maintenance window, avoiding interference with the operation of the track in the maintenance area. Furthermore, the use of precast components makes it easier to control the maintenance quality and results in a more aesthetically pleasing appearance of the ballastless track after maintenance.

[0016] In summary, this plan breaks down the removal of old track bed concrete into two steps, and utilizes prefabrication in the factory to complete the reinforcement binding and formwork assembly of the new track bed concrete. This reduces the workload of steps A and B, and steps C and D, speeds up the work, and makes it easier to complete each step within the maintenance window, avoiding interference with track operation in the maintenance area due to work exceeding the time limit. Furthermore, this plan removes the inter-sleeper track bed concrete, sleepers, and sleeper track bed concrete in steps A and B respectively, and temporarily replaces the sleepers and sleeper track bed concrete with wooden sleepers. This ensures that the track can be reopened for operation after steps A and B, further reducing the impact of this plan on track traffic during maintenance.

[0017] As a preferred embodiment of the present invention, when removing the inter-pillow track concrete in step A, N1 inter-pillow track concretes are removed every M1 inter-pillow track concretes, where M1≥N1, and this process is repeated until all the inter-pillow track concretes in the maintenance area are removed.

[0018] M1 can be an integer multiple of N1, so that the removal of the inter-pillar track bed concrete is completed after M1 / N1 removal operations.

[0019] This solution employs a multi-stage, intermittent removal method when removing the concrete between the sleepers. This avoids the situation where the rail's load-bearing capacity drops excessively and abruptly during the removal section, as is the case with other solutions, such as continuous removal. This prevents situations where the smoothness of train operation decreases or even the track becomes impassable. In other words, this solution ensures that the track can still be reopened at the preset speed after the concrete between the sleepers has been removed.

[0020] In a preferred embodiment of the present invention, M1 = 1 and N1 = 1.

[0021] This plan involves using two sections of inter-pillar track concrete as a group, removing one section of inter-pillar track concrete every other section, and completing the removal of all inter-pillar track concrete in the maintenance area in two separate operations.

[0022] Under the specific arrangement of the segmented removal of the concrete between the sleepers in this plan, on the one hand, it can ensure that the removal of each group of concrete between the sleepers can be completed within a single maintenance window, thereby avoiding the situation where the track cannot run on time due to overtime construction; on the other hand, this plan can avoid the situation where the density of the removal work is too high, which would cause the removal work of two adjacent sleeper concrete sections to interfere with each other and thus affect the construction efficiency.

[0023] As a preferred embodiment of the present invention, in step B, when removing the sleepers and the sleeper track bed concrete, N2 sleepers and the corresponding sleeper track bed concrete are removed every M2 sleepers, where M2≥N2. This process is repeated multiple times until all the sleepers and sleeper track bed concrete in the maintenance area are removed and replaced with the wooden sleepers.

[0024] M2 can be an integer multiple of N2, so that the removal of the track bed concrete between the sleepers is completed after M2 / N2 removal operations. The installation of wooden sleepers can be arranged in various ways, such as installing them after each sleeper and track bed concrete is removed, or installing them all at once after a group of sleepers and track bed concrete has been removed, as long as it can ensure that the track can be reopened for operation.

[0025] This solution employs a multi-stage, intermittent removal method when removing the sleepers and sleeper ballast concrete. This avoids the situation where the load-bearing capacity of the rails drops excessively and abruptly during the removal section, as is the case with other solutions, such as continuous removal. This prevents situations where the smoothness of train operation decreases or even the track becomes impassable. In other words, this solution ensures that the track can still be reopened at the preset speed after the sleepers and sleeper ballast concrete have been removed.

[0026] In a preferred embodiment of the present invention, M2 = 6 and N2 = 3.

[0027] This plan involves grouping nine sleepers and their corresponding track bed concrete into three sets. Every six sleepers, three sleepers and their corresponding track bed concrete are removed, and the removal of all sleepers and track bed concrete within the maintenance area is completed in three phases.

[0028] Under the specific arrangement of the segmented removal of sleepers and corresponding sleeper track bed concrete in this scheme, on the one hand, it can ensure that the removal of each group of sleepers and corresponding sleeper track bed concrete can be completed within one track window, thereby avoiding the situation where the track cannot run on time due to construction exceeding the time limit; on the other hand, this scheme can avoid the situation where the density of removal operations is too high, which would cause the removal operations of two adjacent sleepers and their corresponding sleeper track bed concrete to interfere with each other, thereby affecting the construction efficiency.

[0029] As a preferred embodiment of the present invention, step A further includes the following steps:

[0030] A lateral limiting component is installed between the left and right rails; the lateral limiting component is used to limit the relative displacement of the two rails along the lateral direction of the track.

[0031] Lateral limiting components can take various forms, such as gauge tie rods or lateral supports with a length matching the gauge.

[0032] This solution involves installing lateral limiting components between the left and right rails to connect them together. This can maintain the integrity of the track after the concrete in the sleeper bed is removed in step A, thereby reducing the possibility of track operation accidents.

[0033] As a preferred embodiment of the present invention, step C includes the following steps:

[0034] C1. Remove the wooden sleeper from the predetermined installation position of the track bed frame;

[0035] C2. A rolling element is placed between the track bed frame and the ground, with the axis of the rolling element along the longitudinal direction of the track.

[0036] C3. Move the track bed frame to the predetermined installation position by using the rolling elements; fix the track bed frame.

[0037] Rolling elements can take many forms, such as logs or steel pipes.

[0038] This solution uses rolling elements to assist in the placement of the track bed frame during installation, allowing it to be pushed manually. This reduces the need for large hoisting equipment and lowers construction costs. It also avoids the problem of large hoisting equipment interfering with the rails due to limited installation space above the track bed frame installation location.

[0039] As a preferred embodiment of the present invention, the longitudinal reinforcement of the track bed is retained in step A; and the longitudinal reinforcement of the track bed is removed in step B.

[0040] This solution retains the longitudinal reinforcement before it must be removed, i.e. before installing the wooden sleepers in step B. This ensures the integrity of the reinforcement in the track bed concrete along the longitudinal direction of the track, thereby ensuring the stability of the track after the track bed concrete between the sleepers is removed in step A and reducing the possibility of track operation accidents.

[0041] As a preferred embodiment of the present invention, the preset speed in steps A and B is less than or equal to 45 km / h.

[0042] This plan recommends specific preset speeds in steps A and B, which are lower than the normal operating speed of the track to ensure the safe operation of the track.

[0043] As a preferred embodiment of the present invention, a horizontal wing plate is further provided on the top surface of the template frame facing the side of the track bed concrete; the upper surface of the horizontal wing plate is flush with the top surface of the track bed concrete.

[0044] This solution involves setting a horizontal wing plate on the top surface of the template frame, with its upper surface flush with the top surface of the track bed concrete. When smoothing the track bed concrete, the upper surface of the horizontal wing plate can be used as a smoothing control point, thereby improving the efficiency of smoothing operations and reducing the time spent on smoothing operations.

[0045] As a preferred embodiment of the present invention, when installing the wooden pillow in step B, several pads are placed under the wooden pillow.

[0046] The shims can take various forms, such as steel shims or concrete shims, as long as the elevation of the top surface of the wooden sleeper can be changed by changing the number of shims.

[0047] This solution involves placing shims under the wooden sleepers. By changing the number of shims, the elevation of the top surface of the sleepers can be altered. This facilitates the adjustment of the track elevation after a new track alignment and elevation have been determined for the settlement or arching of the maintenance area.

[0048] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0049] 1. The maintenance method for ballastless track during the operation window of this plan adopts an arrangement of first removing the concrete between the sleepers and then removing the concrete from the sleepers themselves. This disperses the removal of the concrete into two steps. On the one hand, it reduces the amount of work to be done in each step, making it easier to complete the removal work within the operation window and avoiding interference with the operation of the track in the maintenance area. On the other hand, retaining the sleepers and the concrete between the sleepers in step A preserves some of the track's load-bearing capacity, allowing the track under maintenance to be reopened at a preset speed after step A. After removing the sleepers and the corresponding concrete between the sleepers in step B, wooden sleepers are used as temporary supports, allowing the track under maintenance to be reopened at a preset speed after step B as well.

[0050] In step C, this solution uses a precast track bed frame that includes a steel reinforcement skeleton, a formwork frame, transverse supports, and rail supports. Factory prefabrication eliminates the need for on-site adjustments to rail support spacing, steel reinforcement binding, formwork assembly, and formwork dismantling. This makes steps C and D, i.e., the construction of the new track bed concrete, easier to complete within the maintenance window, avoiding interference with the operation of the track in the maintenance area. Furthermore, the use of precast components makes it easier to control the maintenance quality and results in a more aesthetically pleasing appearance of the ballastless track after maintenance.

[0051] In summary, this plan breaks down the removal of old track bed concrete into two steps, and utilizes prefabrication in the factory to complete the reinforcement binding and formwork assembly of the new track bed concrete. This reduces the workload of steps A and B, and steps C and D, speeds up the work, and makes it easier to complete each step within the maintenance window, avoiding interference with track operation in the maintenance area due to work exceeding the time limit. Furthermore, this plan removes the inter-sleeper track bed concrete, sleepers, and sleeper track bed concrete in steps A and B respectively, and temporarily replaces the sleepers and sleeper track bed concrete with wooden sleepers. This ensures that the track can be reopened for operation after steps A and B, further reducing the impact of this plan on track traffic during maintenance. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the plan layout in step A of the ballastless track maintenance method during the operation window period of the present invention. Figure 1 ;

[0053] Figure 2 This is a schematic diagram of the plan layout in step A of the ballastless track maintenance method during the operation window period of the present invention. Figure 2 ;

[0054] Figure 3 This is a schematic diagram of the plan layout in step B of the present invention, which describes a method for maintaining ballastless track during an operational window. Figure 1 ;

[0055] Figure 4 This is a schematic diagram of the plan layout in step B of the present invention, which describes a method for maintaining ballastless track during an operational window. Figure 2 ;

[0056] Figure 5 This is a schematic diagram of the plan layout in step B of the present invention, which describes a method for maintaining ballastless track during an operational maintenance window. Figure 3 ;

[0057] Figure 6 This is a schematic diagram of the plan layout in step C of the present invention, which describes a method for maintaining ballastless track during an operational maintenance window. Figure 1 ;

[0058] Figure 7 This is a schematic diagram of the plan layout in step B of the present invention, which describes a method for maintaining ballastless track during an operational window. Figure 2 ;

[0059] Figure 8 This is a schematic diagram of the planar layout of the template frame used in the maintenance method of ballastless track during the operation window period of the present invention;

[0060] Icons: 1-Sleeper track bed concrete; 2-Sleeper track bed concrete; 3-Wooden sleeper; 4-Track bed frame; 41-Formwork frame; 42-Rail support platform; 43-Transverse support; 44-Reinforcing steel frame; 6-Rolling element; 7-Longitudinal reinforcement. Detailed Implementation

[0061] The present invention will now be described in detail with reference to the accompanying drawings.

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0063] Example 1

[0064] like Figures 1 to 8 As shown, the ballastless track maintenance method during the operation window period adopted in this invention includes the following steps:

[0065] A. Remove the concrete 1 between the sleepers within the maintenance area; the track after removing the concrete 1 between the sleepers can be reopened for operation at the preset speed.

[0066] B. Remove the sleepers and corresponding sleeper track bed concrete 2 within the maintenance area, and replace the removed sleepers with wooden sleepers 3; the track after installing wooden sleepers 3 can be reopened for operation at the preset speed;

[0067] C. Install the track bed frame 4; the track bed frame 4 is a precast component; the track bed frame 4 includes a template frame 41 and a rail support platform 42; the size and shape of the template frame 41 match the size and shape of the track bed concrete; several transverse supports 43 are connected inside the template frame 41; the transverse supports 43 are distributed at intervals along the longitudinal direction of the track, and the rail support platform 42 is set on top of the transverse supports 43; a steel reinforcement frame 44 is also connected inside the template frame 41; when installing the track bed frame 4, remove all wooden sleepers 3 in the corresponding area.

[0068] D. Pour the track bed concrete into the template frame 41; complete the maintenance of the ballastless track.

[0069] In step A, when removing the inter-pillar track concrete 1, N1 inter-pillar track concrete 1s are removed every M1 inter-pillar track concrete 1s, where M1 ≥ N1. This process is repeated until all inter-pillar track concrete 1s in the maintenance area are removed.

[0070] In this embodiment, M1=1, N1=1, meaning that two sections of inter-pillar track concrete 1 are grouped together, and every other section of inter-pillar track concrete 1 is removed, completing the removal of all inter-pillar track concrete 1 within the maintenance area in two separate operations; Figures 1 to 2For example, when removing the concrete 1 between the sleepers, the first step is to remove... Figure 1 The concrete of the sleeper track bed 1 marked with the cross-section line was then chiseled away. Figure 2 The cross-sectional lines of the inter-pillar track concrete 1 are marked in the middle; and when chiseling away the inter-pillar track concrete 1, the longitudinal reinforcing bars 7 of the track bed are retained without being cut; specifically, the chiseling operation of each inter-pillar track concrete 1 is carried out by a group of at least six people, of which at least four people take turns using two pneumatic picks to chisel away the inter-pillar track concrete 1; at least two people are responsible for cleaning up construction debris, such as fragments of inter-pillar concrete slabs; thus, the chiseling and debris cleaning operation of each group of inter-pillar track concrete 1 can be controlled within six hours to avoid exceeding the maintenance window period;

[0071] After the concrete of the sleeper track bed 1 is removed, a transverse limiting device is installed between the two rails on the left and right sides of the track. The transverse limiting device is used to limit the relative displacement of the two rails along the transverse direction of the track. Specifically, in this embodiment, a gauge tie rod is used to connect the rails on both sides.

[0072] After removing the construction debris from the track and checking its geometry, the track can be reopened for operation at a preset speed, which is lower than the track's normal operating speed, for example, less than or equal to 45 km / h.

[0073] In step B, when removing the concrete 2 of the sleeper track bed, N2 sleepers and the corresponding concrete 2 of the sleeper track bed are removed every M2 sleepers, M2≥N2. This process is repeated until all sleepers and concrete 2 of the sleeper track bed in the maintenance area are removed and replaced with wooden sleepers 3.

[0074] In this embodiment, M2=6, N2=3, meaning that nine sleepers and their corresponding sleeper track bed concrete 2 are grouped together. Every six sleepers, three sleepers and their corresponding sleeper track bed concrete 2 are removed, and the removal of all sleepers and sleeper track bed concrete 2 within the maintenance area is completed in three stages. Figures 3 to 5For example, for the sleepers at locations I, II, III, IV, V, VI, VII, VIII, and IX, and their corresponding sleeper ballast concrete 2, the sleepers at locations VII, VIII, and IX are removed first, followed by locations IV, V, and VI, and then locations I, II, and III. The removal order at locations IV, V, and VI and at locations I, II, and III can be interchanged. Specifically, the removal of every three sleepers and their corresponding sleeper ballast concrete 2 is carried out by a group of at least seventy people, with at least sixteen people performing the removal work, at least four people cutting the longitudinal reinforcing steel bars 7, and at least thirty people handling debris cleaning, transporting waste sleepers, and transporting wooden sleepers 3. At least sixteen people are responsible for the installation and reinforcement of wooden sleepers 3, and at least four people are responsible for the transportation and pouring of leveling mortar. According to the personnel allocation, the removal of sleepers and sleeper track bed concrete 2 is carried out. At least nine to twelve sleepers and sleeper track bed concrete 2 can be removed in each maintenance window, and at least one group of nine sleepers and sleeper track bed concrete 2 can be removed. If seventy people are arranged for each group of sleepers and sleeper track bed concrete 2 as in this embodiment, the removal of sleepers and sleeper track bed concrete 2 in the entire maintenance area can be completed in one maintenance window, which can improve the time utilization rate of the maintenance window.

[0075] After removing the concrete slab 2 of the sleeper track bed, wooden sleepers 3 are installed as temporary replacements for the sleepers and the concrete slab 2 of the sleeper track bed. Before installing the wooden sleepers 3, the longitudinal reinforcing bars 7 of the track bed are cut to ensure that the wooden sleepers 3 can be installed without interference. The ground at the installation location of the wooden sleepers 3 is also filled with leveling mortar and several shims are inserted to ensure that the wooden sleepers 3 are installed horizontally. The elevation of the top surface of the wooden sleepers 3 can be changed by changing the number of shims, which allows for easy adjustment of the elevation at the corresponding position of the track. Limiting fixtures are installed between the wooden sleepers 3 and the ground, and / or between the wooden sleepers 3 to fix the position and posture of the wooden sleepers 3, thereby ensuring reliable support for the rail. After installation, the wooden sleepers 3 are connected to the rail with fasteners.

[0076] After removing the construction debris from the track and checking its geometry, the track can be reopened for operation at a preset speed, which is lower than the track's normal operating speed, for example, less than or equal to 45 km / h.

[0077] Before implementing step C, the track surface elevation can be measured again, and a new track alignment and elevation can be designed based on the settlement or supply situation of the maintenance area. The track elevation in the maintenance area can be adjusted according to the new track alignment and elevation, so that the track slope and elevation meet the requirements of the newly designed track alignment and elevation. The catenary guide height can also be adjusted accordingly. After adjusting the track elevation, the track can be reopened for operation at a preset speed, where the preset speed is lower than the normal operating speed of the track, for example, less than or equal to 45 km / h.

[0078] Specifically, when adjusting the track elevation within the maintenance area, i.e., when the track elevation of the sleepers, sleeper track bed concrete 2, and inter-sleeper track bed concrete 1 has been removed, the track elevation at the corresponding location can be adjusted by adjusting the number of shims under the wooden sleepers 3. For the track elevation outside the maintenance area, i.e., when the track elevation of the sleepers, sleeper track bed concrete 2, and inter-sleeper track bed concrete 1 has not been removed, the track elevation at the corresponding location can be adjusted by, for example, replacing fasteners or adjusting the height of the shims. The track elevation adjustment work can be carried out in multiple stages, with each adjustment being approximately ±5mm. At least 126 people can be assigned to the track elevation adjustment work, with at least 80 people responsible for the track elevation adjustment work within the maintenance area and at least 26 people responsible for the track elevation adjustment work outside the maintenance area.

[0079] After the track elevation adjustment is completed, the raw materials and equipment required in step C, such as water, concrete, early-strength concrete mortar mixture, concrete mixing equipment, and track bed frame 4, can be transported to the construction site in advance and then proceed to step C.

[0080] In step C, the track bed frame 4 is connected to a horizontal wing plate on the inner side of the top surface of the template frame 41. The top surface of the horizontal wing plate is flush with the top surface of the track bed concrete, so that it can serve as a control point for concrete finishing when pouring track bed concrete, thus speeding up the concrete finishing operation. The transverse support 43 adopts a multi-hole spatial truss structure, so that when pouring track bed concrete, the concrete can pass through the transverse support 43 and spread freely throughout the template body 41, thereby filling the entire template frame with concrete in one pour and improving the efficiency of the pouring operation.

[0081] like Figures 7 to 8 As shown, step C specifically includes the following steps:

[0082] C1. Remove the wooden pillow 3 from the predetermined installation position of the track bed frame 4;

[0083] C2. Place rolling elements 6 between the track bed frame 4 and the ground, with the axis of the rolling elements 6 along the longitudinal direction of the track.

[0084] C3. Move the track bed frame 4 to the predetermined installation position using the rolling element 6; fix the track bed frame 4.

[0085] In step C1, as Figure 6 As shown, the hook or sling can be directly fixed to the space truss, that is, the hole of the transverse support 43 to realize the hoisting of the transverse support 43; the fasteners at the predetermined installation position of the track bed frame 4 along the longitudinal ends of the track within a certain range, such as within five meters, can also be loosened, and the rail can be lifted to clean the residue at the predetermined installation position of the track bed frame 4 again, thereby facilitating the installation of the track bed frame 4.

[0086] In steps C2 and C3, the rolling element 6 used in this embodiment is a steel pipe; the fixed track bed frame 4 specifically includes erecting a rail panel support, connecting the track bed frame 4 and the rail with fasteners, drilling holes and installing reinforcing bars on the foundation according to the design position; after fixing the track bed frame 4, the geometry of the track is checked again.

[0087] In step D, concrete of grade C30 or higher is used for pouring the track bed concrete. Horizontal flanges are used as control points for the concrete finishing process, thereby accelerating the work and improving efficiency. After finishing, the track bed concrete is allowed to reach its design strength; for example, for C30 concrete, this takes 70 to 90 minutes. In this step, for each group of sleepers, 75 people are assigned to pour the track bed concrete, ensuring the pouring operation is kept within the track maintenance window.

[0088] After the concrete pouring of the track bed is completed, the site is cleaned up again, and the ballastless track is repaired.

[0089] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for maintaining ballastless track during an operational maintenance window, characterized in that, It includes the following steps: A. Remove the inter-sleeper track bed concrete (1) within the maintenance area; remove N1 inter-sleeper track bed concrete (1) every M1 inter-sleeper track bed concrete (1), M1≥N1, and repeat the process until all the inter-sleeper track bed concrete (1) within the maintenance area is removed; the track after removing the inter-sleeper track bed concrete (1) can be reopened at the preset speed. B. Remove the sleepers and corresponding sleeper track bed concrete (2) within the maintenance area, and replace the removed sleepers and corresponding sleeper track bed concrete (2) with wooden sleepers (3); remove N2 sleepers and corresponding sleeper track bed concrete (2) every M2 sleepers, M2≥N2, and repeat the construction until all sleepers and sleeper track bed concrete (2) in the maintenance area are removed and replaced with wooden sleepers (3); the track after the wooden sleepers (3) are installed can be reopened at the preset speed. C. Install the track bed frame (4); the track bed frame (4) is a precast component; the track bed frame (4) includes a template frame (41) and a rail support platform (42); the size and shape of the template frame (41) match the size and shape of the track bed concrete; a horizontal wing plate is also provided on the side of the top surface of the template frame (41) facing the track bed concrete; the upper surface of the horizontal wing plate is flush with the top surface of the track bed concrete; several transverse supports (43) are connected inside the template frame (41); the transverse supports ( 43) The rail support platform (42) is set on the upper part of the transverse support (43) and is distributed longitudinally along the track. The template frame (41) is also connected with a steel reinforcement skeleton (44). When installing the track bed skeleton (4), all the wooden sleepers (3) in the corresponding area are removed. A rolling body (6) is placed between the track bed skeleton (4) and the ground. The axis of the rolling body (6) is along the longitudinal direction of the track. The rail is lifted and the track bed skeleton (4) is rolled to the predetermined installation position using the rolling body (6). The track bed skeleton (4) is fixed. D. Pour the track bed concrete into the template frame (41); complete the maintenance of the ballastless track.

2. The method for maintaining ballastless track during an operational window period according to claim 1, characterized in that, M1=1, N1=1.

3. The method for maintaining ballastless track during an operational window period according to claim 1, characterized in that, M2=6, N2=3.

4. A method for maintaining ballastless track during an operational maintenance window according to any one of claims 1 to 3, characterized in that, Step A also includes the following steps: A lateral limiting component is installed between the left and right rails; the lateral limiting component is used to limit the relative displacement of the two rails along the lateral direction of the track.

5. A method for maintaining ballastless track during an operational maintenance window according to any one of claims 1 to 3, characterized in that, In step A, the longitudinal reinforcement bars of the track bed (7) are retained; in step B, the longitudinal reinforcement bars of the track bed (7) are removed.

6. A method for maintaining ballastless track during an operational maintenance window according to any one of claims 1 to 3, characterized in that, When installing the wooden pillow (3) in step B, several pads are placed under the wooden pillow (3).

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