An adjustable steel-concrete composite sleeper-type ballastless track and its construction method

Abstract

This invention discloses an adjustable steel-concrete composite sleeper-type ballastless track and its construction method, belonging to the field of ballastless track technology. The ballastless track includes two rails, multiple fasteners, multiple steel-concrete composite sleepers, and a track bed. Each rail is mounted on a fastener. Multiple steel-concrete composite sleepers are arranged in parallel at intervals. Each sleeper includes an adjusting pipe and a sleeper unit. Each sleeper unit includes a steel pipe and a sleeper block. One end of the steel pipe is inserted into the sleeper block, and the steel pipe is filled with concrete filler. Each sleeper block and the corresponding concrete filler are integrally cast with concrete. Two steel pipes are movably and coaxially inserted into both ends of the adjusting pipe. The track bed is a slab-like structure formed by cast-in-place concrete between multiple steel-concrete composite sleepers. The adjustable steel-concrete composite sleeper-type ballastless track provided by this invention not only allows for the pre-preparation of sleeper units through casting but also enables adjustment of the track gauge between the two rails.

Description

Technical Field

[0001] This invention belongs to the field of ballastless track technology, and more specifically, relates to an adjustable steel-concrete composite sleeper ballastless track and its construction method. Background Technology

[0002] In railway ballastless track systems, there is a type of prefabricated sleeper, which is either installed in the track bed or cast into the track bed using concrete.

[0003] Currently, the application of concrete-filled steel tube sleepers in ballastless tracks is becoming increasingly common. Concrete-filled steel tube sleepers are formed by integrally molding concrete-filled steel tubes with sleeper blocks, that is, the concrete-filled steel tubes are formed at the same time as the sleeper blocks are poured. The concrete-filled steel tubes are designed to be composed of multiple hollow steel tubes, which effectively increases the sleeper's geometric position retention capability, reduces the amount of steel tubes used, improves workability, and can be directly constructed on site, meeting the requirements for sleeper bending and torsional resistance.

[0004] However, the aforementioned steel-concrete composite sleepers adopt a fixed gauge structure, meaning the spacing between the sleeper blocks at both ends is fixed. When encountering changes in gauge (for example, when encountering structures such as turnouts that require a gradual change in gauge length), the ballastless track cannot meet the on-site installation requirements. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides an adjustable steel-concrete composite sleeper ballastless track and construction method. The purpose is not only to complete the preparation of sleeper units in advance by pouring, thereby improving the overall construction efficiency, but also to effectively increase the connection strength of the two sleeper blocks in the steel-concrete composite sleeper and adjust the track gauge of the two rails so that the track gauge meets the on-site installation requirements.

[0006] In a first aspect, the present invention provides an adjustable steel-concrete composite sleeper ballastless track, the ballastless track comprising two rails, multiple fasteners, multiple steel-concrete composite sleepers and a track bed arranged sequentially from top to bottom;

[0007] Each of the aforementioned rails is respectively installed on one of the aforementioned fasteners;

[0008] Multiple steel-concrete composite sleepers are arranged in parallel at intervals. Each steel-concrete composite sleeper includes at least one adjusting pipe and two sleeper units arranged at intervals. Each sleeper unit includes at least one steel pipe and a sleeper block. Each fastener is located on the corresponding sleeper block. For any sleeper unit, one end of the steel pipe is inserted into the sleeper block, and the steel pipe is filled with concrete filler. Each sleeper block and the corresponding concrete filler are integrally cast with concrete. The two steel pipes are respectively movably and coaxially inserted into the two ends of the adjusting pipe to adjust the distance between the two sleeper blocks. The track bed is a plate-like structure formed by cast-in-place concrete between the multiple steel-concrete composite sleepers, and each sleeper block protrudes from the track bed.

[0009] Optionally, each of the steel pipes has an external thread at the other end, and the inner circumferential walls at both ends of the adjusting pipe have internal threads, with the internal threads and the external threads engaging.

[0010] Optionally, locking bolts are inserted at both ends of the regulating tube, each locking bolt extending radially along the regulating tube and abutting against the corresponding steel pipe after passing through the tube wall of the regulating tube.

[0011] Optionally, each of the steel-concrete composite sleepers further includes an adjusting component, which includes a spring and two push plates. The outer peripheral wall of each push plate is slidably engaged with the inner peripheral wall of the adjusting tube. The two ends of the spring are respectively the two push plates, and the two push plates are located between the two steel pipes.

[0012] Optionally, each end of the adjusting tube has a plurality of positioning holes, which extend along the axial direction of the adjusting tube. At least one positioning pin is inserted into each end of the adjusting tube. Each positioning pin is movably inserted into the plurality of positioning holes, and one end of each positioning pin passes through the corresponding positioning hole and extends into the adjusting tube to restrict the sliding of the push plate.

[0013] Optionally, the spring has a stiffness coefficient between 100,000 N / m and 200,000 N / m, and the spring is made of 60Si2Mn.

[0014] Optionally, the outer diameter of the steel pipe is 40-50 mm.

[0015] In a second aspect, the present invention provides a construction method for adjustable steel-concrete composite sleeper-type ballastless track, the construction method being based on the ballastless track described in the first aspect, the construction method comprising:

[0016] Concrete is poured in advance through the steel pipes and molds to integrally form multiple sleeper units;

[0017] By coaxially inserting the steel pipes of each sleeper unit into both ends of each of the adjusting pipes, a plurality of steel pipe concrete sleepers are obtained.

[0018] Pre-embed or implant connecting steel bars in the bridge deck or foundation slab, and arrange the track bed slab steel cage at the connecting steel bars;

[0019] Multiple steel-concrete composite sleepers are placed in parallel at intervals in the track bed reinforcement cage, and the sleeper blocks of each steel-concrete composite sleeper are moved to adjust the insertion depth of each steel pipe in the corresponding adjustment tube, so that the distance between two sleeper blocks in each steel-concrete composite sleeper reaches a set value.

[0020] Formwork is erected around the reinforcing cage of the track bed slab to pour concrete into the reinforcing cage, thereby forming the track bed and curing it.

[0021] Remove the mold, arrange the corresponding fasteners on each of the sleeper blocks, and install the corresponding rails on the fasteners.

[0022] Optionally, before pre-casting multiple sleeper units by pouring concrete through the steel pipe and mold to form a single unit, the construction method further includes:

[0023] A scale is provided on the outer peripheral wall of each of the regulating pipes and each of the steel pipes, and the scale extends along the axial direction of the regulating pipe or the steel pipe.

[0024] Optionally, before obtaining multiple steel-tube concrete sleepers by coaxially inserting the steel pipes of each sleeper unit into both ends of each of the adjusting pipes, the construction method further includes:

[0025] Locking bolts are provided at both ends of the regulating pipe. Each locking bolt extends radially along the regulating pipe and abuts against the corresponding steel pipe after passing through the pipe wall of the regulating pipe, so as to restrict the steel pipe from sliding inside the regulating pipe.

[0026] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0027] The adjustable steel-concrete composite sleeper ballastless track provided in this embodiment of the invention features a steel pipe with one end inserted into a sleeper block and filled with concrete filler. Each sleeper block and its corresponding concrete filler are integrally cast using concrete, resulting in a high-strength sleeper unit structure. Furthermore, the sleeper units can be prefabricated through casting, improving overall construction efficiency. Additionally, each rail is mounted on multiple fasteners, each fastener located on a corresponding sleeper block. The track bed is a slab-like structure formed by cast-in-place concrete between multiple steel-concrete composite sleepers, with each sleeper block protruding from the track bed, thus forming the entire ballastless track.

[0028] Furthermore, two steel pipes are movably and coaxially inserted into both ends of the adjusting pipe to adjust the distance between the two sleeper blocks. This not only effectively increases the geometric position retention capability of the two sleeper blocks in the steel-concrete composite sleeper (based on the connection of the track bed) through the cooperation of the steel pipes and the adjusting pipe, but also allows the insertion depth of each steel pipe in the corresponding adjusting pipe to be adjusted by moving the sleeper blocks, so that the distance between the two sleeper blocks reaches the set value, thereby adjusting the track gauge of the two rails to meet the on-site installation requirements.

[0029] In other words, the adjustable steel-concrete composite sleeper ballastless track provided by the embodiments of the present invention can not only complete the preparation of sleeper units in advance by pouring, thereby improving the overall construction efficiency, but also adjust the gauge of the two rails so that the gauge meets the on-site installation requirements. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an adjustable steel-concrete composite sleeper-type ballastless track provided in an embodiment of the present invention;

[0031] Figure 2 This is a structural schematic diagram of the steel-concrete composite sleeper provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the adjusting member provided in an embodiment of the present invention;

[0033] Figure 4 This is a flowchart of a construction method for an adjustable steel-concrete composite sleeper ballastless track provided in an embodiment of the present invention.

[0034] The symbols in the diagram represent the following meanings:

[0035] 1. Rail; 2. Fastener; 3. Steel pipe concrete sleeper; 31. Adjusting pipe; 311. Locking bolt; 312. Positioning hole; 313. Positioning pin; 32. Sleeper unit; 321. Steel pipe; 322. Sleeper block; 33. Adjusting component; 331. Spring; 332. Push plate; 4. Track bed. Detailed Implementation

[0036] 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. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Figure 1This is a structural schematic diagram of an adjustable steel-concrete composite sleeper-type ballastless track provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the ballastless track includes two rails 1, multiple fasteners 2, multiple steel pipe concrete sleepers 3, and track bed 4 arranged from top to bottom.

[0038] Each rail 1 is installed on multiple fasteners 2, and multiple steel pipe concrete sleepers 3 are arranged in parallel at intervals (the steel pipe concrete sleepers 3 are perpendicular to the rail 1).

[0039] Figure 2 This is a structural schematic diagram of the steel-concrete composite sleeper provided in an embodiment of the present invention, as shown below. Figure 2 As shown, each steel-concrete composite sleeper 3 includes at least one adjusting pipe 31 and two spaced sleeper units 32. Each sleeper unit 32 includes at least one steel pipe 321 and a sleeper block 322. Each fastener 2 is located on the corresponding sleeper block 322. For any sleeper unit 32, one end of the steel pipe 321 is inserted into the sleeper block 322, and the steel pipe 321 is filled with concrete filler. Each sleeper block 322 and the corresponding concrete filler are integrally cast with concrete. The two steel pipes 321 are movably coaxially inserted into the two ends of the adjusting pipe 31 to adjust the distance between the two sleeper blocks 322. The track bed 4 is a plate-shaped structure formed by cast-in-place concrete between multiple steel-concrete composite sleepers 3, and each sleeper block 322 protrudes from the track bed 4.

[0040] In the adjustable steel-concrete composite sleeper ballastless track provided in this embodiment of the invention, since one end of the steel pipe 321 is inserted into the sleeper block 322 and the steel pipe 321 is filled with concrete filler, and each sleeper block 322 and the corresponding concrete filler are integrally cast with concrete, the sleeper unit 32 has high structural strength and can be prefabricated by casting, thereby improving the overall construction efficiency. In addition, each rail 1 is installed on multiple fasteners 2, and each fastener 2 is located on the corresponding sleeper block 322. The track bed 4 is a plate-shaped structure formed by cast-in-place concrete between multiple steel-concrete composite sleepers 3, and each sleeper block 322 protrudes from the track bed 4, thus forming the entire ballastless track.

[0041] Furthermore, two steel pipes 321 are movably and coaxially inserted into both ends of the adjusting pipe 31 to adjust the spacing between the two sleeper blocks 322. This not only effectively increases the geometric position retention capability of the two sleeper blocks 322 in the steel-concrete composite sleeper 3 (based on the connection of the track bed 4) through the cooperation of the steel pipes 321 and the adjusting pipe 31, but also allows the insertion depth of each steel pipe 321 in the corresponding adjusting pipe 31 to be adjusted by moving the sleeper blocks 322, so that the spacing between the two sleeper blocks 322 reaches the set value, thereby adjusting the track gauge of the two rails 1 to meet the on-site installation requirements.

[0042] In other words, the adjustable steel-concrete composite sleeper track provided in this embodiment of the invention can not only complete the preparation of the sleeper unit 32 in advance by pouring, thereby improving the overall construction efficiency, but also adjust the gauge of the two rails 1 so that the gauge meets the on-site installation requirements.

[0043] In one implementation of the present invention, the other end of each steel pipe 321 has an external thread, and the inner circumferential walls of both ends of the adjusting pipe 31 have internal threads, which are engaged with the external threads.

[0044] In the above embodiment, based on the engagement of internal and external threads, the insertion depth of the steel pipe 321 can be adjusted by screwing on the adjusting tube 31 or the steel pipe 321, thereby conveniently adjusting the spacing between the two sleeper blocks 322. Furthermore, the threaded engagement allows for locking, enabling the pre-assembly of the steel-concrete composite sleeper 3 without on-site assembly (only the spacing of the sleeper blocks 322 needs to be adjusted on-site), improving construction progress. It also prevents accidental movement of the sleeper blocks 322 during actual installation (after adjustment), which could alter the spacing between the two sleeper blocks 322.

[0045] For example, the length of each steel pipe 321 extending out of the sleeper block 322 can be 500-700mm. The length of the internal and external threads can be 100mm, and the spacing between the threads can be 1mm. The length of the adjusting pipe 31 can be 200mm.

[0046] In a second implementation of the present invention, locking bolts 311 are respectively inserted at both ends of the regulating pipe 31. Each locking bolt 311 extends radially along the regulating pipe 31 and abuts against the corresponding steel pipe 321 after passing through the pipe wall of the regulating pipe 31.

[0047] In the above embodiment, the locking bolt 311 can lock the steel pipe 321 after adjustment. This not only allows the assembly of the steel pipe concrete sleeper 3 to be completed in advance without on-site assembly (only the spacing of the sleeper blocks 322 needs to be adjusted on-site), thus improving the construction progress, but also prevents the sleeper blocks 322 from moving unexpectedly during the actual installation process (after adjustment) and causing the spacing between the two sleeper blocks 322 to change.

[0048] Figure 3 This is a schematic diagram of the structure of the adjusting member provided in an embodiment of the present invention, as shown below. Figure 3 As shown, each steel pipe concrete sleeper 3 also includes an adjusting component 33. The adjusting component 33 includes a spring 331 and two push plates 332. The outer peripheral wall of each push plate 332 and the inner peripheral wall of the adjusting pipe 31 are in sliding fit. The two ends of the spring 331 are respectively two push plates 332, and the two push plates 332 are located between the two steel pipes 321.

[0049] In the above embodiment, the adjusting member 33 can push the steel pipe 321 outward, thereby facilitating the adjustment of the spacing of the sleeper blocks 322 and achieving the purpose of saving effort.

[0050] For example, before adjustment, the distance between the two sleeper blocks 322 is at its minimum (during adjustment, the distance between the sleeper blocks 322 increases from small to large). First, loosen all locking bolts 311 to release the locking bolts 311 from limiting the steel pipe 321. Then, since the steel pipe 321 is released from its limitation, the compressed spring 331 will extend, thereby automatically pushing the push plate 332 and the steel pipe 321 outward through thrust, achieving the purpose of saving effort. Finally, when the steel pipe 321 moves to the appropriate position, tighten the locking bolts 311 to limit the steel pipe 321, at which point the distance between the two sleeper blocks 322 reaches the set distance.

[0051] In addition, each end of the regulating tube 31 has a plurality of positioning holes 312, which extend along the axial direction of the regulating tube 31. At least one positioning pin 313 is inserted into each end of the regulating tube 31. Each positioning pin 313 can be movably inserted into the plurality of positioning holes 312, and one end of each positioning pin 313 passes through the corresponding positioning hole 312 and extends into the regulating tube 31 to restrict the sliding of the push plate 332.

[0052] In the above embodiment, by inserting a positioning pin 313 into the positioning hole 312, the outward movement distance of the push plate 332 can be limited.

[0053] For example, before releasing the locking bolt 311 from limiting the steel pipe 321, the positioning pin 313 is inserted into the positioning hole 312 at a suitable position. When the spring 331 pushes the push plate 332 to the target position, the positioning pin 313 will limit the push plate 332. At this time, the push plate 332 has no force on the steel pipe 321, and the steel pipe 321 does not move. This gives the operator enough time to lock the steel pipe 321 again through the positioning pin 313.

[0054] It should be noted that the steel pipe 321 and the adjusting pipe 31 are fitted with a clearance, and the positioning pin 313 will not restrict the movement of the steel pipe 321.

[0055] In this embodiment, the spring constant of spring 331 is between 100,000 N / m and 200,000 N / m, and the material of spring 331 is 60Si2Mn, thereby improving the elastic force while ensuring the structural strength of spring 331.

[0056] For example, the outer diameter of the steel pipe 321 can be 40-50mm.

[0057] Figure 4 This is a flowchart illustrating a construction method for an adjustable steel-concrete composite sleeper-type ballastless track according to an embodiment of the present invention. Figure 4 As shown, this construction method is based on the aforementioned ballastless track, and the construction method includes:

[0058] S401, concrete is poured in advance through steel pipe 321 and mold to form multiple sleeper units 32 in one piece.

[0059] Prior to step S401, the processing method further includes:

[0060] A scale is provided on the outer peripheral wall of each regulating pipe 31 and each steel pipe 321, and the scale extends along the axial direction of the regulating pipe 31 or the steel pipe 321.

[0061] In the above embodiment, the lengths (extended portions) of the adjusting pipe 31 and the steel pipe 321 can be accurately determined by using a scale on the adjusting pipe 31 and the steel pipe 321, thereby determining the distance between the two sleeper blocks 322.

[0062] S402. By coaxially inserting the steel pipes 321 of each sleeper unit 32 into both ends of each adjusting pipe 31, multiple steel pipe concrete sleepers 3 are obtained.

[0063] Before step S402, the processing method further includes:

[0064] Locking bolts 311 are provided at both ends of the regulating pipe 31. Each locking bolt 311 extends radially along the regulating pipe 31. After passing through the pipe wall of the regulating pipe 31, each locking bolt 311 abuts against the corresponding steel pipe 321 to restrict the steel pipe 321 from sliding inside the regulating pipe 31.

[0065] In the above embodiment, the locking bolt 311 can lock the steel pipe 321 after adjustment. This not only allows the assembly of the steel pipe concrete sleeper 3 to be completed in advance without on-site assembly (only the spacing of the sleeper blocks 322 needs to be adjusted on-site), thus improving the construction progress, but also prevents the sleeper blocks 322 from changing the spacing between the two sleeper blocks 322 due to accidental movement during actual installation.

[0066] S403. Pre-embed or implant connecting steel bars in the bridge deck or foundation slab, and arrange the track bed slab steel cage at the connecting steel bars.

[0067] S404. Place multiple steel-concrete composite sleepers 3 in parallel at intervals into the track bed reinforcement cage, and move the sleeper blocks 322 of each steel-concrete composite sleeper 3 to adjust the insertion depth of each steel pipe 321 in the corresponding adjusting pipe 31, so that the distance between the two sleeper blocks 322 in each steel-concrete composite sleeper 3 reaches the set value.

[0068] S405. Erect molds around the reinforcing cage of the track bed slab to pour concrete into the reinforcing cage, thereby forming the track bed 4 and curing it.

[0069] S406. Remove the mold, arrange the corresponding fasteners 2 on each sleeper block 322, and install the corresponding rails 1 on the fasteners 2.

[0070] For example, by adjusting the distance between the two sleeper blocks 322, the resulting track gauge can be 1440mm, 1450mm, or 1460mm, etc.

[0071] For the construction method of adjustable steel-concrete composite sleeper track provided in the embodiments of the present invention, during the construction of the ballastless track, firstly, concrete is poured in advance through steel pipes 321 and molds to integrally form multiple sleeper units 32. By coaxially inserting the steel pipes 321 of each sleeper unit 32 into both ends of each adjusting pipe 31, multiple steel-concrete composite sleepers 3 are obtained, thereby obtaining multiple steel-concrete composite sleepers 3 in advance. Then, connecting steel bars are pre-embedded or implanted in the bridge deck or foundation slab, and the track bed 4 reinforcement cage is placed at the location where the connecting steel bars are arranged. The connecting steel bars serve to connect the track bed 4 and the bridge deck or foundation slab during the subsequent concrete pouring process, and the track bed 4 reinforcement cage can increase the structural strength of the track bed 4. Next, multiple steel-concrete composite sleepers 3 are placed parallel and spaced apart within the reinforcing cage of the track bed 4. The sleeper blocks 322 of each sleeper 3 are moved to adjust the insertion depth of each steel pipe 321 in the corresponding adjusting pipe 31, ensuring the spacing between two opposing sleeper blocks 322 reaches a set value. This allows for adjustment of the gauge of the subsequent two rails 1, ensuring the gauge meets on-site installation requirements. Finally, molds are erected around the track bed reinforcing cage to pour concrete into the cage, forming the track bed 4, which is then cured. The molds are removed, and corresponding fasteners 2 are arranged on each sleeper block 322, with the corresponding rails 1 installed on the fasteners 2.

[0072] In other words, the construction method of the adjustable steel-concrete composite sleeper ballastless track provided by the embodiments of the present invention can not only complete the preparation of the sleeper unit 32 in advance by pouring, thereby improving the overall construction efficiency, but also adjust the gauge of the two rails 1 so that the gauge meets the on-site installation requirements.

[0073] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is 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 scope of protection of the present invention.

Claims

1. An adjustable steel-concrete composite sleeper-type ballastless track, characterized in that, The ballastless track includes two rails (1), multiple fasteners (2), multiple steel pipe concrete sleepers (3), and track bed (4) arranged from top to bottom. Each of the steel rails (1) is respectively installed on one of the fasteners (2); Multiple steel-concrete composite sleepers (3) are arranged in parallel at intervals. Each steel-concrete composite sleeper (3) includes at least one adjusting pipe (31) and two sleeper units (32) arranged at intervals. Each sleeper unit (32) includes at least one steel pipe (321) and a sleeper block (322). Each fastener (2) is located on the corresponding sleeper block (322). For any sleeper unit (32), one end of the steel pipe (321) is inserted into the sleeper block (322). The steel pipe (321) is filled with concrete filler, and each sleeper block (322) and the corresponding concrete filler are integrally cast by concrete. The two steel pipes (321) are respectively movably coaxially inserted into the two ends of the adjusting pipe (31) to adjust the distance between the two sleeper blocks (322). The track bed (4) is a plate-shaped structure formed by cast-in-place concrete between multiple steel pipe concrete sleepers (3), and each sleeper block (322) protrudes from the track bed (4). Locking bolts (311) are respectively inserted at both ends of the regulating pipe (31). Each locking bolt (311) extends radially along the regulating pipe (31). After passing through the pipe wall of the regulating pipe (31), each locking bolt (311) abuts against the corresponding steel pipe (321). Each of the steel-concrete composite sleepers (3) further includes an adjusting component (33), which includes a spring (331) and two push plates (332). The outer peripheral wall of each push plate (332) and the inner peripheral wall of the adjusting tube (31) are in sliding fit. The two ends of the spring (331) are respectively the two push plates (332), and the two push plates (332) are located between the two steel pipes (321). The regulating tube (31) has multiple positioning holes (312) at both ends. The multiple positioning holes (312) extend along the axial direction of the regulating tube (31). At least one positioning pin (313) is inserted into each end of the regulating tube (31). Each positioning pin (313) can be movably inserted into the multiple positioning holes (312). One end of each positioning pin (313) passes through the corresponding positioning hole (312) and extends into the regulating tube (31) to restrict the sliding of the push plate (332).

2. The adjustable steel-concrete composite sleeper-type ballastless track according to claim 1, characterized in that, The spring (331) has a spring constant between 100,000 N / m and 200,000 N / m, and the spring (331) is made of 60Si2Mn.

3. An adjustable steel-concrete composite sleeper-type ballastless track according to any one of claims 1-2, characterized in that, The outer diameter of the steel pipe (321) is 40-50mm.

4. A construction method for an adjustable steel-concrete composite sleeper-type ballastless track, characterized in that, The construction method is based on the ballastless track according to any one of claims 1-3, and the construction method includes: Concrete is poured in advance through the steel pipe (321) and the mold to form multiple sleeper units (32) in one piece. By coaxially inserting the steel pipe (321) of each sleeper unit (32) into both ends of each of the adjustment pipes (31), a plurality of steel pipe concrete sleepers (3) are obtained. Pre-embed or implant connecting steel bars in the bridge deck or foundation slab, and arrange the track bed slab steel cage at the connecting steel bars; Multiple steel-concrete composite sleepers (3) are placed in parallel at intervals in the track bed reinforcement cage, and the sleeper blocks (322) of each steel-concrete composite sleeper (3) are moved to adjust the insertion depth of each steel pipe (321) in the corresponding adjustment pipe (31), so that the distance between the two sleeper blocks (322) in each steel-concrete composite sleeper (3) reaches the set value. Erect molds around the reinforcing cage of the track bed slab to pour concrete into the reinforcing cage of the track bed slab, thereby forming the track bed (4) and curing it; Remove the mold, arrange the corresponding fasteners (2) on each of the sleeper blocks (322), and install the corresponding rails (1) on the fasteners (2).

5. The construction method of an adjustable steel-concrete composite sleeper-type ballastless track according to claim 4, characterized in that, Before the pre-cast concrete pouring of the steel pipe (321) and mold to integrally form multiple sleeper units (32), the construction method further includes: A scale is provided on the outer peripheral wall of each of the regulating pipes (31) and each of the steel pipes (321), and the scale extends along the axial direction of the regulating pipe (31) or the steel pipe (321).

6. The construction method of an adjustable steel-concrete composite sleeper-type ballastless track according to claim 4, characterized in that, Before obtaining multiple steel-concrete sleepers (3) by coaxially inserting the steel pipes (321) of each sleeper unit (32) into both ends of each of the adjusting pipes (31), the construction method further includes: Locking bolts (311) are provided at both ends of the regulating tube (31). Each locking bolt (311) extends radially along the regulating tube (31). After passing through the tube wall of the regulating tube (31), each locking bolt (311) abuts against the corresponding steel pipe (321) to restrict the steel pipe (321) from sliding inside the regulating tube (31).

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