A double-block sleeper structure suitable for a passenger and freight co-linear railway

Abstract

The application provides a double-block sleeper structure suitable for a passenger and freight common-line railway, relates to the technical field of track engineering, and comprises two sleeper blocks which are arranged at intervals in the transverse direction; a support frame group which is connected to the bottom of the two sleeper blocks; and a track fixing member which is arranged on the top surface of the sleeper block; wherein a groove is arranged on the lateral surface of the sleeper block in the transverse direction. The application has the effects of high stability, flexible applicability and low cost.

Description

Technical Field

[0001] This application relates to the field of track engineering technology, and in particular to a double-block sleeper structure suitable for passenger and freight railways. Background Technology

[0002] In railway track structures, sleepers serve as the supporting foundation for the rails, and their performance directly affects the stability and durability of the track. Passenger-freight mixed-use railways, which simultaneously bear the combined loads of high-speed passenger trains and heavy-duty freight trains, require sleepers with high strength, elasticity, and fatigue resistance.

[0003] Currently, common sleeper structures mainly include elastic support block sleepers for ballastless tracks, double sleeper sleepers (two independent sleepers side by side), and long sleeper sleepers (a single wide sleeper). Among them, elastic support block sleepers are suitable for ballastless tracks with high smoothness requirements, but are more expensive; double sleeper sleepers offer flexible construction, but lack lateral stability; long sleeper sleepers have strong overall integrity, but are less adaptable and have higher costs.

[0004] Therefore, there is an urgent need for a sleeper structure that combines high stability, flexibility, and low cost to meet the track structure requirements of passenger and freight railways. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a double-block sleeper structure suitable for passenger and freight railways.

[0006] The technical solution for a double-block sleeper structure suitable for both passenger and freight railways provided in this application is as follows: A double-block sleeper structure suitable for passenger and freight railways includes: Two sleeper blocks are installed at intervals along the transverse direction; A support frame assembly connects the bottoms of the two sleeper blocks; A track fixing component is provided on the top surface of the sleeper block; The sleeper block has grooves on its transverse side surfaces.

[0007] Furthermore, the groove has a triangular cross-section, and the top edge of the groove is rounded.

[0008] Furthermore, the length of the groove accounts for 30-60% of the lateral length of the sleeper.

[0009] Furthermore, the sleeper block is in the shape of a rectangular frustum, and its area gradually increases from the top to the bottom.

[0010] Furthermore, the support frame assembly includes two parallel support trusses, which are spaced apart longitudinally.

[0011] Furthermore, the supporting truss includes upper reinforcing bars, lower reinforcing bars, and a central reinforcing bar connecting the upper and lower reinforcing bars. Both the upper and lower reinforcing bars are arranged transversely. The upper reinforcing bars are embedded in the sleeper block, and two lower reinforcing bars are arranged longitudinally at intervals and located on both sides of the upper reinforcing bars.

[0012] Furthermore, the central reinforcing bar is alternately connected to the upper and lower reinforcing bars in a wavy pattern.

[0013] Furthermore, a steel mesh is pre-embedded inside the sleeper block, and the steel mesh is fixedly connected to the upper layer of steel bars by multiple vertical bars.

[0014] Furthermore, the track fixing component includes two symmetrically arranged embedded seats, and the bottom of the embedded seats is provided with a laterally extending extension.

[0015] Furthermore, the sleeper has rounded corners on all four sides.

[0016] In summary, this application includes at least one of the following beneficial technical effects: This application, by setting grooves on the sides of the sleeper blocks in a double-block sleeper structure, can effectively increase the contact area between new and old concrete during the casting process. Through mechanical interlocking, the contact area is increased, stress is dispersed, and shrinkage is restrained, significantly enhancing the crack resistance and integrity of the interface between the new and old concrete. Furthermore, in conjunction with the bottom support frame assembly and the top embedded seat, the integrity between the sleeper block and the track bed is improved after secondary casting, thereby enhancing the stability of the double-block sleeper structure. This application gives the double-block sleeper structure the advantages of high stability, flexible applicability, and low cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0019] Figure 2 This is a vertical exploded view of an embodiment of this application.

[0020] Figure 3 This is the front view of an embodiment of this application.

[0021] Figure 4 This is a top view of an embodiment of this application.

[0022] Figure 5This is a side view of an embodiment of this application.

[0023] Reference numerals: 1. Sleeper block; 11. Groove; 2. Support frame assembly; 21. Upper layer reinforcement; 22. Lower layer reinforcement; 23. Middle reinforcement; 3. Track fixing component; 31. Embedded seat; 4. Reinforcing mesh. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] This application discloses a double-block sleeper structure suitable for passenger and freight railways. (Refer to...) Figure 1 Double-block sleeper structures suitable for both passenger and freight railways include: Sleeper block 1 is a precast concrete block, with two blocks spaced apart in the transverse direction; its transverse length is 844mm, its longitudinal width is 260mm, its height is 150mm, and the furthest distance between two sleeper blocks 1 is 2470mm.

[0026] The support frame assembly 2 is pre-embedded and anchored inside the sleeper block 1 at the top, connecting the bottom of the two sleeper blocks 1; The track fixing component 3 is disposed on the top surface of the sleeper block 1; The sleeper block 1 has grooves 11 on its transverse side.

[0027] This application connects two concrete sleeper blocks 1 into one unit using a support frame assembly 2. Each concrete block has a set of track fixing parts 3 on its top surface for installing and fixing a single track. The sleeper blocks 1 have grooves 11 on their transverse sidewalls, which can effectively increase the contact area between the new and old concrete during the casting process. Through mechanical interlocking, the contact area is increased, stress is dispersed, and shrinkage is restrained, significantly enhancing the crack resistance and integrity of the interface between the new and old concrete. In addition, in conjunction with the bottom support frame assembly 2 and the top embedded seat 31, the integrity of the sleeper blocks 1 and the track bed is improved after the secondary casting, thereby improving the stability of the double-block sleeper structure. This application achieves the dual-block sleeper structure's advantages of high stability, flexible applicability, and low cost.

[0028] Specifically, such as Figure 1 and Figure 2As shown, the cross-section of the groove 11 is triangular, and the top edge of the groove 11 is rounded. The hypotenuse of the triangular groove 11 forms a stress diffusion angle, dispersing the compressive stress on the track bed concrete to both sides. Compared to a rectangular groove, this reduces stress concentration at the bottom of the groove by more than 30%. Furthermore, the rounded top edge further eliminates stress singularities at the corners, preventing concrete cracking. Under train dynamic loads, the rounded top edge prevents the initiation of microcracks at right angles, and the triangular groove makes the crack propagation path tortuous (requiring detours around the inclined surface), extending fatigue life by 2-3 times. The combination of the triangular groove and rounded corners reduces the mold demolding resistance by more than 40% (compared to a right-angled groove), thus facilitating the demolding of the groove 11.

[0029] Furthermore, the length of the groove 11 needs to be controlled within a reasonable range to ensure sufficient mechanical interlocking while avoiding excessive weakening of the sleeper body rigidity and affecting its load-bearing capacity. The length of the groove 11 accounts for 30-60% of the transverse length of the sleeper. In this embodiment, the length of the groove 11 is set to 500mm, the depth to 20mm, and the height to 40mm.

[0030] In addition, the sleepers are rounded around all four sides, which can effectively eliminate stress concentration, reduce edge spalling and crack propagation, reduce ballast breakage rate and improve demolding efficiency, thus comprehensively enhancing durability and construction convenience.

[0031] To further improve the stability of the connection between the sleeper block 1 and the track bed after secondary casting, the sleeper block 1 is designed as a rectangular frustum shape, and its area gradually increases from the top to the bottom. The rectangular frustum-shaped sleeper block 1 (narrower at the top and wider at the bottom) enhances the mechanical engagement with the track bed through the inclined self-locking effect, optimizes stress distribution and reduces demolding resistance, and significantly improves pull-out stability and construction efficiency.

[0032] On the other hand, the support frame group 2 consists of two parallel support trusses. The two support trusses are spaced apart in the longitudinal direction, which can reduce the weight and save materials while ensuring the overall rigidity of the sleeper, and facilitate the compaction of concrete pouring, thus achieving a balance between mechanical performance and construction economy.

[0033] Specifically, refer to Figure 4 and Figure 5 The supporting truss includes upper reinforcing bars 21, lower reinforcing bars 22, and middle reinforcing bars 23. Both the upper and lower reinforcing bars 21 are arranged transversely. The upper reinforcing bars 21 are pre-embedded within the sleeper block 1, and two lower reinforcing bars 22 are spaced apart longitudinally, located on either side of the upper reinforcing bars 21. The lower reinforcing bars 22 can be pre-embedded in the track bed or anchored to the track bed via pre-reserved reinforcing bars. The middle reinforcing bars 23 connect the upper and lower reinforcing bars 21. This layout, with its inverted V-shape, reduces the self-weight while ensuring support rigidity.

[0034] Furthermore, the middle steel bar 23 is alternately welded and fixed to the upper steel bar 21 and the lower steel bar 22 in a wavy pattern along the transverse direction, which can enhance the overall shear stiffness of the truss, disperse the peak longitudinal stress, and form a three-dimensional spatial truss effect through the alternating welding with the upper and lower steel bars 22, which significantly improves the bending and fatigue resistance of the sleeper.

[0035] like Figure 2 and Figure 3 As shown, to further improve the stability of the sleeper mechanism, a pre-embedded steel mesh 4 is embedded in the sleeper block 1. The steel mesh 4 is anchored to the upper steel bar 21 through multiple vertical bars (not shown in the figure). The pre-fabricated steel mesh 4 inside the sleeper connects with the upper steel bar 21 to form an integral load-bearing skeleton, enhancing the co-bearing capacity of the concrete, effectively dispersing dynamic stress and inhibiting crack propagation, significantly improving structural durability and fatigue resistance, and further enhancing the stability of the structure of this application.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-block sleeper structure suitable for passenger and freight railways, characterized in that, include: Two sleeper blocks are installed at intervals along the transverse direction; A support frame assembly connects the bottoms of the two sleeper blocks; A track fixing component is provided on the top surface of the sleeper block; The sleeper block has grooves on its transverse side surfaces.

2. The double-block sleeper structure suitable for passenger and freight railways according to claim 1, characterized in that, The groove has a triangular cross-section, and the top edge of the groove is rounded.

3. A double-block sleeper structure suitable for passenger and freight railways according to claim 2, characterized in that, The length of the groove accounts for 30-60% of the lateral length of the sleeper.

4. A double-block sleeper structure suitable for passenger and freight railways according to claim 1, characterized in that, The sleeper block is in the shape of a rectangular frustum, and its area gradually increases from the top to the bottom.

5. A double-block sleeper structure suitable for passenger and freight railways according to claim 1, characterized in that, The support frame assembly includes two parallel support trusses, which are spaced apart longitudinally.

6. A double-block sleeper structure suitable for passenger and freight railways according to claim 5, characterized in that, The supporting truss includes upper-layer steel bars, lower-layer steel bars, and middle steel bars connecting the upper-layer steel bars and the lower-layer steel bars. Both the upper-layer steel bars and the lower-layer steel bars are arranged in the transverse direction. The upper-layer steel bars are embedded in the sleeper blocks. The lower-layer steel bars are arranged in two longitudinal intervals and are located on both sides of the upper-layer steel bars.

7. A double-block sleeper structure suitable for passenger and freight railways according to claim 6, characterized in that, The central reinforcing bars are alternately connected to the upper and lower reinforcing bars in a wavy pattern.

8. A double-block sleeper structure suitable for passenger and freight railways according to claim 6, characterized in that, The sleeper block is pre-embedded with a steel mesh, which is fixedly connected to the upper steel bar by multiple vertical bars.

9. A double-block sleeper structure suitable for passenger and freight railways according to claim 1, characterized in that, The track fixing component includes two symmetrically arranged embedded seats, and the bottom of the embedded seats is provided with a laterally extending extension.

10. A double-block sleeper structure suitable for passenger and freight railways according to claim 1, characterized in that, The sleeper has rounded corners on all four sides.

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