A steel pipe concrete sleeper for ballastless track

Abstract

This invention discloses a steel-concrete composite sleeper for ballastless track, belonging to the field of ballastless track technology. The steel-concrete composite sleeper includes multiple adjusting pipes and two spaced-apart sleeper units. Each sleeper unit includes multiple steel pipes and sleeper blocks. For any given sleeper unit, the multiple adjusting pipes and multiple steel pipes correspond one-to-one. One end of each steel pipe is inserted into a sleeper block, and each steel pipe is filled with concrete filler. Each sleeper block and the corresponding concrete filler are integrally cast with concrete. The other ends of two opposing steel pipes are movably and coaxially inserted into the two ends of the corresponding adjusting pipes to adjust the spacing between the two sleeper blocks. This invention provides a steel-concrete composite sleeper for ballastless track, which not only allows for the pre-casting of sleeper units, improving the overall construction efficiency of ballastless track, but also allows for adjustment of the track gauge between the two rails, ensuring the gauge meets on-site installation requirements.

Description

Technical Field

[0001] This invention belongs to the field of ballastless track technology, and more specifically, relates to a steel-concrete composite sleeper for ballastless track. 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 a steel tube concrete sleeper for ballastless track. Its purpose is not only to improve the construction efficiency of the entire ballastless track by pre-casting the sleeper unit, but also to adjust the gauge of the two rails so that the gauge meets the on-site installation requirements.

[0006] The present invention provides a steel-concrete composite sleeper for ballastless track, the steel-concrete composite sleeper comprising a plurality of adjusting pipes and two sleeper units arranged at intervals.

[0007] Each sleeper unit includes multiple steel pipes and sleeper blocks. For any sleeper unit, multiple adjusting pipes and multiple steel pipes correspond one-to-one. One end of each steel pipe is inserted into the sleeper block, and each steel pipe is filled with concrete filler. Each sleeper block and the corresponding concrete filler are integrally cast by concrete.

[0008] The other ends of the two opposing steel pipes are respectively movably and coaxially inserted into the two ends of the corresponding adjusting pipe to adjust the distance between the two sleeper blocks.

[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, the steel-concrete composite sleeper 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 interval between any two adjacent positioning holes at each end of the adjusting tube is 5-10 mm.

[0014] Optionally, the spring has a stiffness coefficient between 100,000 N / m and 200,000 N / m, and the spring is made of 60Si2Mn.

[0015] Optionally, the inner peripheral walls at both ends of the regulating tube are respectively provided with inner flanges, the inner peripheral walls of the inner flanges and the corresponding outer peripheral walls of the steel pipes are in sliding fit, and the outer peripheral walls at the other end of the corresponding steel pipes are provided with outer flanges, the outer peripheral walls of the outer flanges and the corresponding inner peripheral walls of the regulating tubes are in sliding fit, and each of the corresponding outer flanges is located between the two inner flanges.

[0016] Optionally, each end of the regulating tube has a limiting joint, each limiting joint including a threaded sleeve and an annular protrusion. The two threaded sleeves are respectively threaded into the outer peripheral walls of both ends of the regulating tube. Each annular protrusion is coaxially located at one end of the corresponding threaded sleeve and abuts against the end face of the regulating tube. Each annular protrusion is fixedly connected to the corresponding inner flange, and the outer peripheral wall of the inner flange is slidably engaged with the inner peripheral wall of the regulating tube. The inner peripheral wall of the inner flange is also slidably engaged with the outer peripheral wall of the steel pipe.

[0017] Optionally, the threaded sleeve, the annular protrusion, and the corresponding inner flange are integrally formed.

[0018] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0019] The steel-concrete composite sleeper for ballastless track provided in this embodiment of the invention has multiple adjusting pipes and multiple steel pipes that correspond one-to-one. One end of each steel pipe is inserted into the sleeper block, and each steel pipe is filled with concrete filler. Each sleeper block and the corresponding concrete filler are integrally cast with concrete, which makes the sleeper unit structure strong and allows the sleeper unit to be prepared in advance by casting, thus achieving prefabrication and improving the construction efficiency of the entire ballastless track.

[0020] Furthermore, the other ends of the two opposing steel pipes are movably and coaxially inserted into the two ends of the corresponding adjusting pipes 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 through the cooperation of the steel pipes and adjusting pipes, 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 opposing sleeper blocks reaches the set value, thereby adjusting the track gauge of the two rails to meet the on-site installation requirements.

[0021] In other words, the steel-concrete composite sleeper for ballastless track provided in this embodiment of the invention can not only complete the preparation of the sleeper unit in advance by pouring, thereby improving the construction efficiency of the entire ballastless track, but also adjust the gauge of the two rails so that the gauge meets the on-site installation requirements. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a steel-concrete composite sleeper for ballastless track provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the adjusting member provided in an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the regulating tube provided in an embodiment of the present invention.

[0025] The symbols in the diagram represent the following meanings:

[0026] 1. Adjusting pipe; 11. Locking bolt; 12. Positioning hole; 13. Positioning pin; 14. Inner flange; 15. Limiting joint; 151. Threaded sleeve; 152. Annular protrusion; 2. Sleeper unit; 21. Steel pipe; 211. Outer flange; 22. Sleeper block; 3. Adjusting component; 31. Spring; 32. Push plate. Detailed Implementation

[0027] 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.

[0028] Figure 1 This is a structural schematic diagram of a steel-concrete composite sleeper for ballastless track provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the steel-concrete composite sleeper includes multiple adjusting pipes 1 and two sleeper units 2 arranged at intervals.

[0029] Each sleeper unit 2 includes multiple steel pipes 21 and sleeper blocks 22. For any sleeper unit 2, multiple adjusting pipes 1 and multiple steel pipes 21 correspond one-to-one. One end of each steel pipe 21 is inserted into the sleeper block 22, and each steel pipe 21 is filled with concrete filler. Each sleeper block 22 and the corresponding concrete filler are integrally cast by concrete pouring.

[0030] The other ends of the two opposing steel pipes 21 are respectively movably and coaxially inserted into the two ends of the corresponding adjusting pipes 1 to adjust the distance between the two sleeper blocks 22.

[0031] For the steel-concrete composite sleeper for ballastless track provided in this embodiment of the invention, since multiple adjusting pipes 1 and multiple steel pipes 21 correspond one-to-one, one end of each steel pipe 21 is inserted into the sleeper block 22, and each steel pipe 21 is filled with concrete filler, each sleeper block 22 and the corresponding concrete filler are integrally cast by concrete, which makes the sleeper unit 2 structurally strong, and the sleeper unit 2 can be prepared in advance by casting, realizing prefabrication, thereby improving the construction efficiency of the entire ballastless track.

[0032] Furthermore, the other ends of the two opposing steel pipes 21 are respectively movably and coaxially inserted into the two ends of the corresponding adjusting pipes 1 to adjust the distance between the two sleeper blocks 22. This not only effectively increases the geometric position retention capability of the two sleeper blocks 22 in the steel pipe concrete sleeper through the cooperation of the steel pipes 21 and the adjusting pipes 1, but also allows the insertion depth of each steel pipe 21 in the corresponding adjusting pipe 1 to be adjusted by moving the sleeper blocks 22, so that the distance between the two opposing sleeper blocks 22 reaches the set value, thereby adjusting the track gauge of the two rails to meet the on-site installation requirements.

[0033] In other words, the steel-concrete composite sleeper for ballastless track provided in this embodiment of the invention can not only complete the preparation of sleeper unit 2 in advance by pouring, thereby improving the construction efficiency of the entire ballastless track, but also adjust the gauge of the two rails so that the gauge meets the on-site installation requirements.

[0034] In one implementation of the present invention, the other end of each steel pipe 21 has an external thread, and the inner circumferential walls of both ends of the adjusting pipe 1 have internal threads, which are engaged with the external threads.

[0035] In the above embodiment, based on the engagement of internal and external threads, the insertion depth of the steel pipe 21 can be adjusted by screwing on the adjusting tube 1 or the steel pipe 21, thereby conveniently adjusting the spacing between the two sleeper blocks 22. Furthermore, the threaded engagement allows for locking, enabling the pre-assembly of the steel-concrete sleepers without on-site assembly (only the spacing of the sleeper blocks 22 needs to be adjusted on-site), improving construction progress, and preventing accidental movement of the sleeper blocks 22 during actual installation (after adjustment), which could alter the spacing between the two sleeper blocks 22.

[0036] For example, the length of each steel pipe 21 extending out of the sleeper block 22 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 1 can be 200mm, and the wall thickness is 5mm.

[0037] In another implementation of the present invention, locking bolts 11 are respectively inserted at both ends of the regulating pipe 1. Each locking bolt 11 extends radially along the regulating pipe 1 and abuts against the corresponding steel pipe 21 after passing through the pipe wall of the regulating pipe 1.

[0038] In the above embodiment, the locking bolt 11 can lock the steel pipe 21 after adjustment. This not only allows the steel pipe concrete sleeper to be assembled in advance without on-site assembly (only the spacing of the sleeper blocks 22 needs to be adjusted on-site), thus improving the construction progress, but also prevents the sleeper blocks 22 from moving unexpectedly during the actual installation process (after adjustment) and causing a change in the spacing between the two sleeper blocks 22.

[0039] Figure 2 This is a schematic diagram of the structure of the adjusting member provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the steel-concrete composite sleeper also includes an adjusting component 3, which includes a spring 31 and two push plates 32. The outer peripheral wall of each push plate 32 is in sliding fit with the inner peripheral wall of the adjusting pipe 1. The two ends of the spring 31 are respectively two push plates 32, and the two push plates 32 are located between the two steel pipes 21.

[0040] In the above embodiment, the adjusting member 3 can push the steel pipe 21 outward, thereby facilitating the adjustment of the spacing between the sleeper blocks 22 and achieving the purpose of saving effort.

[0041] For example, before adjustment, the distance between the two sleeper blocks 22 is at its minimum (during adjustment, the distance between the sleeper blocks 22 increases from small to large). First, loosen all locking bolts 11 to release the locking bolts 11 from limiting the steel pipe 21. Then, since the steel pipe 21 is released from its limitation, the compressed spring 31 will extend, thereby automatically pushing the push plate 32 and the steel pipe 21 outward through thrust, achieving the purpose of saving effort. Finally, when the steel pipe 21 moves to the appropriate position, tighten the locking bolts 11 to limit the steel pipe 21. At this time, the distance between the two sleeper blocks 22 reaches the set distance.

[0042] In this embodiment, the two ends of the regulating tube 1 have a plurality of positioning holes 12, which extend along the axial direction of the regulating tube 1. At least one positioning pin 13 is inserted into each end of the regulating tube 1. Each positioning pin 13 can be movably inserted into the plurality of positioning holes 12, and one end of each positioning pin 13 passes through the corresponding positioning hole 12 and extends into the regulating tube 1 to restrict the sliding of the push plate 32.

[0043] In the above embodiment, the outward movement distance of the push plate 32 can be limited by inserting a positioning pin 13 into the positioning hole 12.

[0044] For example, before releasing the locking bolt 11 from limiting the steel pipe 21, the positioning pin 13 is inserted into the positioning hole 12 at the appropriate position. When the spring 31 pushes the push plate 32 to the target position, the positioning pin 13 will limit the push plate 32. At this time, the push plate 32 has no force on the steel pipe 21, and the steel pipe 21 does not move. This gives the operator enough time to lock the steel pipe 21 again through the positioning pin 13.

[0045] It should be noted that the steel pipe 21 and the adjusting pipe 1 are fitted with a clearance, and the positioning pin 13 will not restrict the movement of the steel pipe 21.

[0046] For example, the interval between any two adjacent positioning holes 12 at each end of the regulating tube 1 can be 5-10 mm.

[0047] For example, the spring constant of spring 31 is between 100,000 N / m and 200,000 N / m, and the material of spring 31 is 60Si2Mn, thereby improving the elastic force while ensuring the structural strength of spring 31.

[0048] For example, the outer diameter of the steel pipe 21 can be 40-50 mm.

[0049] Figure 3 This is a cross-sectional view of the regulating tube provided in an embodiment of the present invention, such as... Figure 3As shown, the inner peripheral walls at both ends of the regulating pipe 1 have inner flanges 14, and the inner peripheral walls of the inner flanges 14 and the corresponding outer peripheral walls of the steel pipe 21 are in sliding fit. The outer peripheral walls at the other end of the corresponding steel pipe 21 each have outer flanges 211, and the outer peripheral walls of the outer flanges 211 and the corresponding inner peripheral walls of the regulating pipe 1 are in sliding fit. Each corresponding outer flange 211 is located between two inner flanges 14.

[0050] In the above implementation, the inner flange 14 serves to limit the outer flange 211, preventing the steel pipe 21 from detaching from the regulating pipe 1 and affecting the regulating efficiency.

[0051] For example, both the inner flange 14 and the outer flange 211 are steel structures.

[0052] In this embodiment, each end of the regulating pipe 1 has a limiting connector 15. Each limiting connector 15 includes a threaded sleeve 151 and an annular protrusion 152. The two threaded sleeves 151 are threadedly engaged with the outer peripheral walls of both ends of the regulating pipe 1. Each annular protrusion 152 is coaxially located at one end of the corresponding threaded sleeve 151 and abuts against the end face of the regulating pipe 1. Each annular protrusion 152 is fixedly connected to the corresponding inner flange 14, and the outer peripheral wall of the inner flange 14 is slidably engaged with the inner peripheral wall of the regulating pipe 1. The inner peripheral wall of the inner flange 14 is also slidably engaged with the outer peripheral wall of the steel pipe 21.

[0053] In the above embodiment, the inner flange 14 can be conveniently arranged by screwing the limiting joint 15 at both ends of the regulating pipe 1, thus avoiding interference of the inner flange 14 with the assembly of the steel pipe 21.

[0054] For example, after the sleeper unit 2 is prefabricated but before it leaves the factory, an inner flange 14 is fitted onto the steel pipe 21 of each sleeper unit 2, thereby simultaneously completing the installation of the limiting joint 15. Then, an outer flange 211 is arranged on the outer peripheral wall of the other end of the steel pipe 21, and the outer flange 211 is inserted into the adjusting pipe 1. Finally, the limiting joint 15 is slid to the end face of the adjusting pipe 1 and tightened, so that the inner flange 14 is stably arranged on the inner peripheral wall of the end of the adjusting pipe 1, thereby limiting the outer flange 211.

[0055] In other words, the installation of the limiting connector 15 in the regulating pipe 1 can automatically drive the inner flange 14 to form an installation.

[0056] For example, the threaded sleeve 151, the annular protrusion 152 and the corresponding inner flange 14 are integrally formed, thereby increasing the connection strength among the threaded sleeve 151, the annular protrusion 152 and the inner flange 14.

[0057] 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. A steel-concrete composite sleeper for ballastless track, characterized in that, The steel-concrete composite sleeper includes multiple adjusting pipes (1) and two sleeper units (2) arranged at intervals. Each sleeper unit (2) includes multiple steel pipes (21) and sleeper blocks (22). For any sleeper unit (2), multiple adjusting pipes (1) and multiple steel pipes (21) correspond one-to-one. One end of each steel pipe (21) is inserted into the sleeper block (22), and each steel pipe (21) is filled with concrete filler. Each sleeper block (22) and the corresponding concrete filler are integrally cast by concrete. The other ends of the two opposing steel pipes (21) are respectively movably coaxially inserted into the two ends of the corresponding adjusting pipe (1) to adjust the distance between the two sleeper blocks (22); Locking bolts (11) are respectively inserted at both ends of the regulating pipe (1). Each locking bolt (11) extends radially along the regulating pipe (1). After passing through the pipe wall of the regulating pipe (1), each locking bolt (11) abuts against the corresponding steel pipe (21). The steel pipe concrete sleeper also includes an adjusting component (3), which includes a spring (31) and two push plates (32). The outer peripheral wall of each push plate (32) and the inner peripheral wall of the adjusting pipe (1) are in sliding fit. The two ends of the spring (31) are respectively connected to the two push plates (32), and the two push plates (32) are located between the two steel pipes (21). The regulating tube (1) has multiple positioning holes (12) at both ends. The multiple positioning holes (12) extend along the axial direction of the regulating tube (1). At least one positioning pin (13) is inserted into each end of the regulating tube (1). Each positioning pin (13) can be movably inserted into the multiple positioning holes (12), and one end of each positioning pin (13) passes through the corresponding positioning hole (12) and extends into the regulating tube (1) to restrict the sliding of the push plate (32).

2. A steel-concrete composite sleeper for ballastless track according to claim 1, characterized in that, The interval between any two adjacent positioning holes (12) at each end of the regulating tube (1) is 5-10 mm.

3. A steel-concrete composite sleeper for ballastless track according to claim 1, characterized in that, The spring (31) has a spring constant between 100,000 N / m and 200,000 N / m, and the spring (31) is made of 60Si2Mn.

4. A steel-concrete composite sleeper for ballastless track according to any one of claims 1-3, characterized in that, The inner peripheral walls of both ends of the regulating pipe (1) are respectively provided with inner flanges (14). The inner peripheral walls of the inner flanges (14) and the outer peripheral walls of the corresponding steel pipes (21) are in sliding fit. The outer peripheral walls of the other end of the corresponding steel pipes (21) are provided with outer flanges (211). The outer peripheral walls of the outer flanges (211) and the inner peripheral walls of the corresponding regulating pipes (1) are in sliding fit. Each of the corresponding outer flanges (211) is located between the two inner flanges (14).

5. A steel-concrete composite sleeper for ballastless track according to claim 4, characterized in that, The regulating pipe (1) has a limiting connector (15) at both ends. Each limiting connector (15) includes a threaded sleeve (151) and an annular protrusion (152). The two threaded sleeves (151) are threadedly engaged with the outer peripheral walls at both ends of the regulating pipe (1). Each annular protrusion (152) is coaxially located at one end of the corresponding threaded sleeve (151) and abuts against the end face of the regulating pipe (1). Each annular protrusion (152) is fixedly connected to the corresponding inner flange (14). The outer peripheral wall of the inner flange (14) is slidably engaged with the inner peripheral wall of the regulating pipe (1). The inner peripheral wall of the inner flange (14) is slidably engaged with the outer peripheral wall of the steel pipe (21).

6. A steel-concrete composite sleeper for ballastless track according to claim 5, characterized in that, The threaded sleeve (151), the annular protrusion (152), and the corresponding inner flange (14) are integrally formed.

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