A rapid replacement method for the ballastless track bed of concrete-filled steel tube sleeper type

Abstract

The present invention discloses a rapid replacement method for the ballastless track bed of concrete-filled steel tube sleeper type, belonging to the technical field of railway tracks. A steel bar mesh is arranged in the track bed to be replaced; replacement units are divided according to the replacement area and construction resource allocation; the between-sleeper concrete between each pair of sleepers in the construction replacement unit is removed; the around-sleeper concrete around each sleeper in the construction replacement unit is removed; the supporting concrete at the bottom end of each sleeper is removed; the concrete-filled steel tube sleepers are rearranged and the track bed is re-poured; and the above process is repeated in a cycle until the replacement of all construction replacement units is completed. The present invention provides a rapid replacement method for the ballastless track bed of concrete-filled steel tube sleeper type, which can, when defects occur in the subgrade under the track line, achieve rapid and accurate treatment of the defective track, and does not affect the train operation and traffic safety during the time period outside the construction skylight during the disease treatment process, reduces the risk of overall replacement, and does not require relatively complex transition measures.

Description

Technical Field

[0001] The present invention belongs to the technical field of railway tracks, and particularly relates to a rapid replacement method for the ballastless track bed of a concrete-filled steel tube sleeper type. Background Art

[0002] China has a vast territory and complex railway service environments. With the increase in the railway operation mileage and service time, diseases have occurred in the subgrade foundations of many lines, such as the settlement of bridges and tunnels, and the deviation of subgrades. The track structures of high-speed railways and intercity and suburban railways generally adopt ballastless tracks, which have the advantages of good stability and less maintenance. However, after displacement diseases occur in the subgrade foundation, the workload of rectifying the subgrade is large, the structure is complex, and the construction organization is relatively difficult. Usually, the alignment of the rail surface is ensured by rectifying the ballastless track. Common methods include adjusting the fasteners and rectifying the ballastless track bed. Generally, the adjustment range of the ballastless track fasteners is limited. When a large displacement occurs in the subgrade foundation, the adjustment amount of the fasteners cannot meet the rectification requirements, and it is necessary to rectify the ballastless track bed to ensure the smoothness of the rail surface.

[0003] According to different construction processes, the rectification of the ballastless track bed can be divided into mechanical rectification and chemical rectification. Mechanical rectification uses machinery such as jacks to lift or deflect the track structure, and chemical rectification uses chemical expansion materials for subgrade filling to lift the track structure. The applicability of both rectification methods is relatively limited. Chemical rectification can only be applied in the subgrade section by injecting chemical materials into the subgrade filling. For the continuous ballastless track structure, mechanical rectification needs to consider the characteristics of the continuous ballastless track, which increases the rectification range and workload, and generally has poor economy. Summary of the Invention

[0004] In view of one or more of the above defects or improvement requirements in the prior art, the present invention provides a rapid replacement method for the ballastless track bed of a concrete-filled steel tube sleeper type, which can quickly and accurately process the diseased track when defects occur in the subgrade foundation of the track, and does not affect the traffic and driving safety during the time period outside the construction skylight during the disease treatment process, reduces the risk of overall replacement, and does not require relatively complex transition measures.

[0005] To achieve the above object, the present invention provides a rapid replacement method for the ballastless track bed of a concrete-filled steel tube sleeper type, which is used to replace the ballastless track bed with a steel mesh inside that has diseases, and includes the following steps:

[0006] Detect the ballastless track bed to determine the disease, determine the replacement area according to the disease, divide the construction replacement units according to the replacement area and the construction resource allocation, and determine the construction batches and the construction replacement units that are constructed simultaneously in the same batch;

[0007] Remove the concrete between the sleepers and the transverse steel bars between the sleepers in each construction replacement unit, and retain the longitudinal steel bars;

[0008] Remove the concrete around each sleeper in the construction replacement unit, and retain the supporting concrete at the bottom end of each sleeper;

[0009] Remove the longitudinal steel bars in the construction replacement unit and the fasteners on each sleeper, remove the supporting concrete at the bottom end of each sleeper, and then extract the concrete-filled steel tube sleepers;

[0010] Re-arrange all the concrete-filled steel tube sleepers in the construction replacement unit, and re-pour the roadbed in the construction replacement unit;

[0011] Select the construction replacement unit for the next construction batch, and repeat the above process in a loop until the replacement of all construction replacement units is completed.

[0012] As a further preference of the present invention, both longitudinal sides of each construction replacement unit are non-construction sections.

[0013] As a further preference of the present invention, the non-construction section is the unconstructed replacement unit or the normal roadbed.

[0014] As a further preference of the present invention, removing the concrete between the sleepers and the transverse steel bars in the construction replacement unit includes the following steps:

[0015] Set at least one set of anchoring components between the roadbed and the subgrade under the line on both transverse sides of the construction replacement unit; use a cutting device to cut the steel bars on each side of the construction replacement unit; gradually remove the concrete between the sleepers and remove the transverse steel bars.

[0016] As a further preference of the present invention, a pickaxe, an electric pickaxe, a high-pressure water jet, or a combination of one or more of them is used to remove the concrete between the sleepers.

[0017] As a further preference of the present invention, the process of removing the concrete around each sleeper in the construction replacement unit is as follows:

[0018] Mark the position of the steel tube on the concrete around the sleeper; use a pickaxe or an electric pickaxe to break the concrete around the sleeper away from the steel tube; remove the concrete around the sleeper close to the steel tube without damaging the steel tube.

[0019] As a further preference of the present invention, the concrete around the sleeper close to the steel tube is removed by a high-pressure water jet.

[0020] As a further preference of the present invention, the removal of the supporting concrete includes the following steps:

[0021] Remove part of the concrete at the bottom end of the sleeper and set temporary supports; remove the remaining concrete outside the temporary supports.

[0022] As a further preference of the present invention, the rearrangement of all the concrete-filled steel tubular sleepers in the construction replacement unit presents the following process:

[0023] Rearrange the steel bar mesh in the construction replacement unit; arrange each concrete-filled steel tubular sleeper at the corresponding position of the steel bar mesh, and fix the rail on the concrete-filled steel tubular sleeper by using fasteners.

[0024] As a further preference of the present invention, the re-pouring of the roadbed of the construction replacement unit includes the following steps:

[0025] Set up formwork around the construction replacement unit to enclose the roadbed pouring area; use a track geometry measuring instrument in cooperation with a total station and a screw adjuster to finely adjust the direction, elevation and level of the track panel; re-pour polymer concrete of the same grade as the original roadbed in the roadbed pouring area, and after the polymer concrete meets the design requirements, polish and trim the surface of the polymer concrete.

[0026] As long as the above-mentioned improved technical features do not conflict with each other, they can be combined with each other.

[0027] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include:

[0028] (1) For a rapid replacement method of a ballastless track roadbed with concrete-filled steel tubular sleepers of the present invention, by adopting the step of preferentially dividing construction units, construction resources are accurately allocated, thereby realizing the high efficiency and rationalization of construction operations; and by successively breaking the concrete between sleepers, the concrete around sleepers and the concrete at the bottom of sleepers, the phased breaking of the roadbed concrete is realized, thereby effectively ensuring that the entire construction replacement unit always has passability outside the construction skylight period, ensuring the safety and reliability of vehicle passage, greatly reducing the risk of overall replacement of the roadbed, and there is no more complex transition method, effectively reducing the construction cost of roadbed replacement.

[0029] (2) For a rapid replacement method of a ballastless track roadbed with concrete-filled steel tubular sleepers of the present invention, during the process of breaking the concrete around the sleepers, by accurately marking the steel pipes between the sleepers transversely, damage to the rails between the sleepers during the process of breaking the concrete is avoided, and further, a step-by-step breaking scheme with different breaking tools is adopted. On the premise of ensuring the high efficiency of concrete breaking, the integrity of the steel pipe structure is further ensured, and the stability of the sleeper structure can be ensured after breaking the concrete around the sleepers, providing a reliable guarantee for the safe passage of vehicles outside the construction skylight period.

[0030] (3) A rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type in the present invention has a simple process, high reliability, and wide application. It adopts the step of preferentially dividing construction units to accurately allocate construction resources, and through the interval setting between the construction replacement unit and the non-construction replacement unit, it ensures the structural stability of the construction replacement unit except during the skylight period; and by using a variety of clearing tools in combination, while achieving efficient breaking of the concrete around the sleeper, it ensures that the rails will not be damaged and the integration of the two transverse sleepers is ensured; and through the temporary support structure adopted during the process of breaking the concrete at the bottom end of the sleeper, it realizes the temporary support of the sleeper, improves the stability during the breaking of the supporting concrete at the bottom end of the sleeper, effectively reduces the construction cost of the track bed replacement, and has excellent economic benefits and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flowchart of a rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type in the present invention;

[0032] Figure 2 is a cross-sectional view of the concrete-filled steel tubular sleeper type ballastless track in the present invention;

[0033] Figure 3 is a schematic structural diagram of the replacement unit in the present invention;

[0034] Figure 4 is a schematic diagram of clearing the concrete between the sleepers of the track bed slab in the present invention;

[0035] Figure 5 is a schematic diagram of clearing the concrete around the sleeper box in the present invention.

[0036] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0037] 1, rail; 2, concrete-filled steel tubular sleeper; 3, steel pipe; 4, track bed; 5, concrete between sleepers; 6, concrete around the sleeper. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] Embodiment:

[0044] Such as Figures 1 to 5As shown in the figure, the rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper in the preferred embodiment of the present application can quickly and accurately handle the ballastless track bed with a steel mesh inside when there are defects in the subgrade under the track, and does not affect the traffic and driving safety during the time period outside the construction skylight during the disease treatment process, reducing the risk of overall replacement and eliminating the need for relatively complex transition measures.

[0045] Specifically, as Figure 1 shown in the figure, it includes the following steps:

[0046] S1. Detect the ballastless track bed to determine the disease, determine the replacement area according to the disease, divide the construction replacement units according to the replacement area and the construction resources allocation, and determine the construction batches and the construction replacement units that are constructed simultaneously in the same batch;

[0047] S2. Remove the concrete between the sleepers 5 and the transverse steel bars between each sleeper in the construction replacement unit, and retain the longitudinal steel bars;

[0048] S3. Remove the concrete around each sleeper 6 around each sleeper in the construction replacement unit, and retain the supporting concrete at the bottom of each sleeper;

[0049] S4. Remove the longitudinal steel bars in the construction replacement unit and the fasteners on each sleeper, remove the supporting concrete at the bottom of each sleeper, and then extract the concrete-filled steel tubular sleeper 2;

[0050] S5. Rearrange all the concrete-filled steel tubular sleepers 2 in the construction replacement unit, and re-pour the ballastless track bed 4 in the construction replacement unit;

[0051] S6. Select the construction replacement unit of the next construction batch, and repeat the above process until the replacement of all construction replacement units is completed.

[0052] Furthermore, in the preferred embodiment of the present application, both longitudinal sides of the construction replacement unit in step 1 are non-construction sections, and the non-construction section is preferably an unconstructed replacement unit or a normal ballastless track bed 4. In the actual construction process, setting non-construction sections on both longitudinal sides of the construction replacement unit can avoid the occurrence of continuous construction replacement units, so that during the construction process, the overall structure strength of the track can be guaranteed, and the stability of vehicle operation outside the construction skylight period can be avoided. Preferably, the construction replacement units and non-construction replacement units are arranged alternately. In addition, it should be noted that all the sleepers mentioned in the present application are concrete-filled steel tubular sleepers 2.

[0053] More specifically, in a preferred embodiment of the present application, the steps of removing the concrete between the sleepers 5 and the transverse steel bars between each sleeper in the construction replacement unit in step S2 include the following steps:

[0054] S21. Set at least one set of anchoring components between the track bed 4 on both lateral sides of the construction replacement unit and the subgrade under the line.

[0055] Preferably, the anchoring components preferably adopt post - installed rebar anchoring to achieve the fixation between the track bed 4 and the subgrade under the line, so as to facilitate the deformation of the track slabs and / or the subgrade under the line caused by the force of removing concrete during the construction process. Further preferably, the post - installed rebar anchoring is fixed with anti - cracking anchoring adhesive.

[0056] S22. Use a cutting device to cut the steel bars on each side of the construction replacement unit.

[0057] S23. Gradually remove the concrete 5 between the sleepers and the transverse steel bars between each sleeper.

[0058] Preferably, the cutting depth of the cutting device is the same as the vertical depth of removing the concrete 5 between the sleepers, and both are preferably up to the bottom end face of the track bed 4, that is, the connection position of the track bed 4 and the subgrade under the line, to ensure the accurate removal of the track bed 4.

[0059] Further preferably, one or more of a pneumatic pick, an electric pick or a high - pressure water jet are used to remove the concrete 5 between the sleepers to ensure the removal efficiency of the concrete and ensure the removal of the concrete 5 between the sleepers and the transverse steel bars of the construction replacement unit during the construction skylight period.

[0060] In the actual construction process, since only the removal of the concrete 5 between the sleepers and the transverse steel bars between each sleeper is completed in step S2, after the construction of step S2 is completed, the concrete 6 around the sleepers and the longitudinal steel bars between each sleeper are set to ensure that there is sufficient strength in the whole construction replacement unit, and normal vehicle passage can be guaranteed after the construction skylight period.

[0061] Further, in a preferred embodiment of the present application, in step S3, the removal of the concrete 6 around each sleeper in the construction replacement unit includes the following steps:

[0062] S31. Mark the position of the steel pipe 3 on the concrete 6 around the sleeper.

[0063] Preferably, the position shapes of the steel pipe 3 corresponding to the three end faces are drawn on the top and both side faces of the concrete 6 around the sleeper, so as to facilitate the subsequent breaking of the concrete around the steel pipe 3.

[0064] S32. Use a pneumatic pick or an electric pick to break the concrete 6 around the sleeper far from the steel pipe 3.

[0065] S33. Remove the concrete 6 around the sleeper close to the steel pipe 3 without damaging the steel pipe 3. [[ID=з5]]

[0066] Preferably, the concrete 6 around the sleeper near the steel pipe 3 is the concrete with a thickness of 1 to 2 times the diameter of the steel pipe 3.

[0067] Since it is necessary to ensure that the steel pipe 3 is not damaged while removing the concrete 6 around the sleeper, preferably, a high-pressure water jet is used to remove the concrete 6 around the sleeper near the steel pipe 3.

[0068] In the actual construction process, since the concrete at the bottom of the sleeper is retained in step S3 to achieve the support at the bottom of the sleeper, and at the same time, through the longitudinal steel bars between the sleepers and the concrete of the steel pipe 3 between the two transverse sleepers, the overall structural strength of the entire construction replacement unit is ensured, so that it is possible to ensure completely reliable and stable traffic after the construction window period of step S3 is completed.

[0069] Furthermore, in another preferred embodiment of the present application, in step S4, the concrete for supporting the bottom of each sleeper includes the following steps:

[0070] S41. Remove part of the concrete at the bottom end of the sleeper to form a temporary support layout space;

[0071] S42. Set up a temporary support in the temporary support layout space;

[0072] S43. Remove the concrete at the bottom end of the sleeper outside the temporary support layout space.

[0073] Preferably, the temporary support layout space is the entire excavation space from the bottom end face of the sleeper to the subgrade foundation excavated at the four corners of the sleeper. Further preferably, the temporary support can be a support structure such as an I-beam, which is used to achieve the temporary support of the sleeper and facilitate the accurate and rapid removal of the concrete for supporting the bottom of the sleeper.

[0074] In the above embodiment, since after the construction operations in the first two construction skylight periods, in the third construction skylight period, only the concrete under the sleeper needs to be removed, and the concrete construction workload is small. Therefore, there is sufficient time in the third construction skylight period to complete steps 4 and 5, that is, after the removal of each sleeper in the construction replacement unit is completed, the deployment of new sleepers can also be completed simultaneously in the third skylight period.

[0075] Furthermore, in a preferred embodiment of the present application, in step S5, rearranging all the steel pipe concrete sleepers 2 in the construction replacement unit includes the following steps:

[0076] S51. Rearrange the steel bar mesh in the construction replacement unit;

[0077] Preferably, the steel bar mesh includes transverse steel bars and longitudinal steel bars, which are arranged at the bottom end of the sleeper to achieve the support of the sleeper and can achieve the stable connection between the sleeper and the roadbed 4 after the concrete pouring is completed.

[0078] S52. Arrange each concrete-filled steel tube sleeper 2 at the corresponding position of the steel bar mesh, and use fasteners to fix the rail 1 on the concrete-filled steel tube sleeper 2.

[0079] Preferably, after the arrangement of the concrete-filled steel tube sleepers 2 is completed, longitudinal steel bars extending longitudinally can also be set. The longitudinal steel bars sequentially pass through a plurality of concrete-filled steel tube sleepers 2 longitudinally to realize the longitudinal connection of each sleeper in the entire construction replacement unit and ensure the stability of the construction replacement unit.

[0080] Further, in a preferred embodiment of the present application, in step S5, the re-pouring of the roadbed 4 of the construction replacement unit includes the following steps:

[0081] S53. Set up formwork around the construction replacement unit to enclose the pouring area of the roadbed 4;

[0082] S54. Use a track geometry measuring instrument in cooperation with a total station and screw adjusters to finely adjust the direction, elevation, and level of the track panel

[0083] S55. Re-pour polymer concrete of the same grade as the original roadbed 4 within the pouring area of the roadbed 4. After the polymer concrete meets the design requirements, polish and trim the surface of the polymer concrete.

[0084] Further, in another preferred embodiment of the present application, the rapid replacement method further includes step S7, specifically as follows:

[0085] S7. Re-finely adjust the fasteners of the rail 1 until the smoothness of the rail 1 meets the design requirements.

[0086] Further preferably, in a preferred embodiment of the present application, the longitudinal steel bars between adjacent two replacement units after replacement are connected by welding.

[0087] More specifically, in order to increase the connection strength between adjacent two replacement units or between the replacement unit and the vertical section of the roadbed without diseases, in a preferred embodiment of the present application, the connection strength between adjacent replacement units is increased by means of sanding the vertical section of the completed replacement unit or the roadbed without diseases and setting expansion bolts.

[0088] A rapid replacement method for the ballastless track bed 4 of a concrete-filled steel tube sleeper type in the present invention has a simple process, high reliability and wide application. It adopts the step of preferentially dividing construction units to accurately allocate construction resources, and by setting intervals between construction replacement units and non-construction replacement units, it ensures the structural stability of the construction replacement units except during the skylight period; and by using a combination of various removal tools, while achieving efficient breaking of the concrete 6 around the sleeper, it ensures that the rail 1 will not be damaged and ensures the integration of the two transverse sleepers; and through the temporary support structure adopted during the process of breaking the concrete at the bottom end of the sleeper, it realizes the temporary support of the sleeper, improves the stability during the breaking of the concrete supporting the bottom end of the sleeper, effectively reduces the construction cost of the replacement of the track bed 4, and has excellent economic benefits and popularization value.

[0089] It is easy for those skilled in the art to understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rapid replacement method for the ballastless track bed of a concrete-filled steel tubular sleeper type, which is used to replace the track bed with a steel mesh inside that has developed diseases, is characterized in that, It includes the following steps: Detect the roadbed to determine the disease, determine the replacement area according to the disease, divide the construction replacement units according to the replacement area and the construction resource allocation, and determine the construction batches and the construction replacement units constructed simultaneously in the same batch; Remove the concrete between the sleepers and the transverse steel bars between each sleeper in the construction replacement unit, and retain the longitudinal steel bars; wherein, Set at least one set of anchoring components between the roadbed and the subgrade under the line on both lateral sides of the construction replacement unit; use a cutting device to cut the steel bars on each side of the construction replacement unit; gradually remove the concrete between each sleeper and remove the transverse steel bars; Remove the concrete around each sleeper in the construction replacement unit and retain the supporting concrete at the bottom end of each sleeper; wherein, Mark the positions of the steel pipes on the concrete around the sleeper; use a pneumatic pick or an electric pick to break the concrete around the sleeper far from the steel pipe; remove the concrete around the sleeper close to the steel pipe without damaging the steel pipe; Remove the longitudinal steel bars in the construction replacement unit and the fasteners on each sleeper, remove the supporting concrete at the bottom end of each sleeper, and then extract the steel pipe concrete sleepers; Re-arrange all the steel pipe concrete sleepers in the construction replacement unit and re-pour the roadbed in the construction replacement unit; Select the construction replacement units of the next construction batch and repeat the above process in a loop until the replacement of all the construction replacement units is completed.

2. The rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type according to claim 1, wherein, Both longitudinal sides of each construction replacement unit are non-construction sections.

3. The rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type according to claim 2, wherein, The non-construction section is an unconstructed replacement unit or a normal roadbed.

4. The rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type according to claim 1, wherein, The concrete between the sleepers is removed by using one or more of a pneumatic pick, an electric pick, and a high-pressure water jet.

5. The rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type according to claim 1, wherein, The concrete around the sleeper close to the steel pipe is removed by using a high-pressure water jet.

6. The rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type according to any one of claims 1 to 5, wherein, The removal of the supporting concrete includes the following steps: Remove part of the concrete at the bottom end of the sleeper and set a temporary support for the sleeper; remove the remaining concrete outside the temporary support.

7. The rapid replacement method for the ballastless track bed of concrete-filled steel tube sleeper type according to any one of claims 1 to 5, wherein, The re-arrangement of all the steel pipe concrete sleepers in the construction replacement unit is as follows: Re-arrange the steel bar mesh in the construction replacement unit; arrange each steel pipe concrete sleeper at the corresponding position of the steel bar mesh and fix the rail on the steel pipe concrete sleeper by using a fastener.

8. The rapid replacement method for the ballastless track bed of concrete-filled steel tubular sleeper type according to claim 7, wherein, The re-pouring of the roadbed in the construction replacement unit includes the following steps: Set templates around the construction replacement unit to enclose the roadbed pouring area; use a track geometry measuring instrument in cooperation with a total station and a screw adjuster to finely adjust the direction, elevation, and level of the track panel; re-pour polymer concrete of the same grade as the original roadbed in the roadbed pouring area, and after the polymer concrete meets the design requirements, polish and trim the surface of the polymer concrete.

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