Specially-made short sleeper overlapping type track structure suitable for low-height condition

Abstract

The utility model discloses a special short sleeper overlapping type track structure suitable for a low-height condition. The special short sleeper overlapping type track structure comprises a steel rail, a fastener, a short sleeper, ballast bed steel bars embedded into an existing ballast bed and a wrapping structure. The short sleeper comprises a rail bearing table and a steel plate with an anchoring hole; the steel plate is connected with anchoring ribs of the existing ballast bed in a welded mode through the anchoring holes. The wrapping structure is composed of ballast bed concrete, wraps the short sleepers and the ballast bed steel bars and forms an overlapping body with the existing ballast bed, and through the overlapping design of the short sleepers and the existing ballast bed, the performance of the low-height track structure is remarkably improved; the short sleeper is composed of a rail bearing table and a steel plate with anchoring holes, the steel plate is connected with anchoring ribs of an existing ballast bed in a welded mode through the anchoring holes, a rigid joint is formed, and structural stability and anti-pulling strength are ensured. Meanwhile, the ballast bed concrete wraps the short sleepers and the ballast bed steel bars and forms a continuous overlapping body with the existing ballast bed, so that uniform load transmission is realized, and local stress concentration is avoided.

Description

Technical Field

[0001] This utility model relates to the field of rail transit track bed structure technology, and in particular to a specially designed short sleeper stacked track structure suitable for low-height conditions. Background Technology

[0002] With the rapid development of rail transit technology, integral track beds, due to their advantages of high stability, smoothness, and low maintenance, have become the mainstream track structure for high-speed railways, suburban railways, and urban rail transit. Traditional integral track beds consist of rails, fasteners, sleepers, and a reinforced concrete track bed. The standard structural height in rectangular tunnels is 560mm, and in circular tunnels it reaches 760mm. While this structure can guarantee routine operational needs, it faces severe challenges under special working conditions in actual engineering projects.

[0003] During the construction phase of new railway lines, track alignment and gradient adjustments are often necessary due to factors such as tunnel structure construction errors and geological deformation. After gradient adjustments, the track structure height in some sections can be significantly reduced, especially when the height is less than 350mm. Traditional sleepers cannot be installed due to size limitations, and conventional track bed structures are difficult to adapt. Although the engineering community has attempted to reinforce the structural foundations, the depth of modification is often insufficient to meet the functional requirements under extremely low height conditions due to foundation bearing capacity safety requirements, becoming a technical bottleneck restricting the refined construction of track engineering.

[0004] For existing railway lines, the problem of uneven settlement of tunnel structures caused by the complex geological environment of cities is particularly prominent. Long-term settlement leads to deformation of the existing track bed, and the geometric deviation of the track far exceeds the adjustment range of the fasteners. Current renovation schemes mostly adopt the technique of burying new short sleepers, which requires the removal of a large area of ​​existing sleepers and cutting of drainage bars. This not only has a long construction period and high cost, but also seriously damages the integrity of the original structure. The renovated track bed often suffers from secondary settlement, concrete cracking and other durability problems, which directly affect the operational safety of the line.

[0005] To address the dual challenges of low height restrictions in new construction projects and the need to address defects in existing tracks, an innovative track structure is urgently required. This structure must overcome the traditional limitations on track bed height while also exhibiting characteristics such as minimal disturbance to existing track beds, ease of construction, and high long-term stability, in order to meet the specific requirements of complex engineering scenarios. Utility Model Content

[0006] Purpose of the invention: The purpose of this utility model is to provide a specially designed short sleeper stacked track structure suitable for low-altitude conditions, and to solve the problems of track bed defects caused by special design of track bed in sections with low track bed height after track alignment and slope adjustment, as well as uneven settlement of civil engineering structures.

[0007] Technical solution:

[0008] A specially designed short-sleeper composite track structure suitable for low-altitude conditions includes rails, fasteners, short sleepers, track bed reinforcement embedded in the existing track bed, and a wrapping structure; the short sleeper includes a rail support platform and a steel plate with anchor holes; the steel plate is welded to the anchor bars of the existing track bed through the anchor holes; the wrapping structure is made of track bed concrete, which covers the short sleeper and track bed reinforcement and forms a composite with the existing track bed.

[0009] Furthermore, the thickness of the short sleeper is 70-100mm, its rail support platform is a concrete platform, and the steel plate is embedded in the bottom of the rail support platform.

[0010] Furthermore, the short sleeper also includes a steel sleeve that penetrates the steel plate and the rail support platform, with the bottom of the steel sleeve exposed on the bottom surface of the steel plate, and a nylon sleeve installed inside the steel sleeve.

[0011] Furthermore, two sets of the steel sleeve and nylon sleeve are arranged diagonally along the short pillow.

[0012] Furthermore, multiple anchor holes are arranged circumferentially along the steel plate.

[0013] Furthermore, the track bed reinforcement bars are horizontally arranged embedded bars, with their ends extending into the existing track bed.

[0014] Furthermore, the top surface of the rail support platform is provided with an array of bolt holes for connection with fasteners, and the distance between the bottom surface of the steel plate and the surface of the existing track bed is 20-50mm.

[0015] Furthermore, the total vertical height of the composite is less than 350 mm.

[0016] Beneficial Effects: The design of combining short sleepers with existing track bed significantly improves the performance of low-height track structures. The short sleeper consists of a rail support platform and a steel plate with anchoring holes. The steel plate is welded to the existing track bed's anchoring bars through these holes, forming a rigid node that ensures structural stability and pull-out strength. Simultaneously, the track bed concrete encases the short sleeper and track bed reinforcement, forming a continuous composite with the existing track bed, achieving uniform load distribution and avoiding localized stress concentration. This design not only compresses the track structure height to below 350mm, meeting the construction requirements of extremely low-height sections, but also significantly reduces damage to the existing track bed. Construction is convenient and the alteration is concealed, making it suitable for track engineering under complex conditions. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the track structure in a section with a low height of the rectangular tunnel structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the track structure for the settlement treatment of existing track bed in a circular tunnel according to this utility model.

[0019] Figure 3 This is a plan view of the present invention;

[0020] Figure 4 This is a cross-sectional view of the short pillow of this utility model;

[0021] Figure 5 This is a plan view of the short pillow of this utility model. Detailed Implementation

[0022] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figure 1-4 As shown, a specially designed short-sleeper composite track structure suitable for low-altitude conditions includes a rail 1, fasteners 2, short sleepers 3, track bed reinforcement 4 embedded in the existing track bed 6, and a wrapping structure; the short sleeper 3 includes a rail support platform 7 and a steel plate 8 with anchor holes 11; the steel plate 8 is welded to the anchor bars of the existing track bed 6 through the anchor holes; the wrapping structure is composed of track bed concrete 5, which covers the short sleeper 3 and track bed reinforcement 4 and forms a composite with the existing track bed 6.

[0025] The existing track bed 6 has longitudinal anchor bars 12 pre-embedded inside. During construction, the surface of the base needs to be roughened and cleaned so that the steel plate 8 of the short sleeper 3 can be welded to the pre-embedded anchor bars 12 through the anchor holes 11, and finally wrapped by the track bed concrete 5 to form a composite body.

[0026] The core of this invention lies in solving the technical challenges of low-height track structures through the overlapping design of the short sleeper 3 and the existing track bed 6. The short sleeper 3 consists of a rail support platform 7 and a steel plate 8 with anchor holes 11. The steel plate 8 is welded to the anchor bars of the existing track bed 6 through the anchor holes to form a rigid node, ensuring structural stability. The track bed concrete 5 encases the short sleeper 3 and the track bed reinforcement 4, forming a continuous overlap with the existing track bed 6 to achieve uniform load transfer. This design compresses the track structure height to below 350mm while reducing damage to the existing track bed, making it suitable for construction needs in low-height sections.

[0027] In this embodiment, the spur sleeper 3 has a thickness of 70-100mm, and its rail support platform 7 is a concrete platform. The steel plate 8 is embedded in the bottom of the rail support platform. The spur sleeper 3 adopts a thin design of 70-100mm, which significantly reduces the height of the track structure and meets the installation requirements under extreme slope conditions. The rail support platform 7 is a concrete platform with high compressive strength, and the embedded steel plate 8 enhances the overall rigidity of the spur sleeper, ensuring its durability under dynamic loads.

[0028] In this embodiment, the short sleeper 3 further includes a steel sleeve 10 that penetrates the steel plate and the rail support platform 7. The bottom of the steel sleeve 10 is exposed on the bottom surface of the steel plate, and a nylon sleeve 9 is installed inside the steel sleeve 10. This provides precise positioning and installation. The exposed bottom design of the steel sleeve 10 facilitates positioning and ensures reliable connection.

[0029] In this embodiment, two sets of steel sleeves 10 and nylon sleeves 9 are arranged diagonally along the short pillow 3. The diagonal arrangement of the steel sleeves 10 and nylon sleeves 9 allows for quick positioning by using two sets of diagonal arrangement.

[0030] In this embodiment, multiple anchor holes 11 are arranged circumferentially along the steel plate 8. The circumferential distribution design of the anchor holes 11 allows the short sleepers 3 to be connected to the existing track bed 6 through multi-point welding to form a three-dimensional anchoring system, which significantly enhances the pull-out and shear resistance and ensures the long-term stability of the structure under dynamic loads.

[0031] In this embodiment, the track bed reinforcement 4 is a transversely arranged embedded reinforcement with its end extending into the existing track bed 6. The transversely embedded track bed reinforcement 4 and the existing track bed 6 form an integral force system, further enhancing the bending and shear resistance of the composite and avoiding concrete cracking or structural deformation caused by uneven load.

[0032] In this embodiment, the top surface of the track support platform 7 is provided with an array of bolt holes that connect to the fasteners 2. The bottom surface of the steel plate 8 is 20-50mm away from the surface of the existing track bed 6. The bolt hole array is designed in a standardized manner to accommodate various types of fasteners and improve construction efficiency. The 20-50mm distance between the bottom surface of the steel plate 8 and the surface of the existing track bed 6 facilitates welding operations and ensures the compactness of the concrete pouring, thereby improving the overall structural integrity.

[0033] In this embodiment, the total vertical height of the composite body is less than 350mm. By optimizing the thickness of the short sleeper 3 and the design of the composite body, the height of the track structure is compressed to less than 350mm, breaking through the traditional track bed height limit, meeting the construction requirements of extremely low height sections, and ensuring structural safety and durability.

[0034] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A specially designed short-pier laminated track structure suitable for low height conditions, characterized in that, The application relates to a short sleeper structure for a railway track, which comprises a steel rail (1), a fastener (2), a short sleeper (3), a track bed reinforcing bar (4) embedded in an existing track bed (6) and a wrapping structure; the short sleeper (3) comprises a rail bearing platform (7) and a steel plate (8) with an anchoring hole (11); the steel plate (8) is welded to the anchoring bar of the existing track bed (6) through the anchoring hole; the wrapping structure is composed of track bed concrete (5) and covers the short sleeper (3) and the track bed reinforcing bar (4) and forms a superimposed body with the existing track bed (6).

2. A specially designed short-pier folded track structure suitable for low height conditions according to claim 1, characterized in that, The thickness of the short sleeper (3) is 70-100 mm, the rail bearing platform (7) is a concrete platform body, and the steel plate (8) is embedded in the bottom of the rail bearing platform.

3. A specially designed short-pier folded track structure suitable for low height conditions according to claim 1, characterized in that, The short sleeper (3) further comprises a steel sleeve (10) arranged through the steel plate and the rail bearing platform (7), the bottom of the steel sleeve (10) is exposed to the bottom surface of the steel plate, and a nylon sleeve (9) is arranged in the steel sleeve (10).

4. A specially designed short-pier folded track structure for low height conditions according to claim 1, characterized in that, Two groups of steel sleeves (10) and nylon sleeves (9) are arranged along the diagonals of the short sleeper (3).

5. A specially designed short-pier folded track structure suitable for low height conditions according to claim 1, characterized in that, A plurality of anchoring holes (11) are arranged along the circumference of the steel plate (8).

6. A specially designed short-pier folded track structure for low height conditions according to claim 1, characterized in that, The track bed reinforcing bar (4) is a transversely arranged embedded bar, and the end of the embedded bar extends into the existing track bed (6).

7. A specially designed short-pier folded track structure suitable for low height conditions according to claim 1, characterized in that, The top surface of the rail bearing platform (7) is provided with an array of bolt holes connected with the fastener (2), and the distance between the bottom surface of the steel plate (8) and the surface of the existing track bed (6) is 20-50 mm.

8. A specially designed short-pier folded track structure for low height conditions according to claim 1, characterized in that, The total vertical height of the superimposed body is less than 350 mm.

Images