Modular composite track bed structure

Abstract

This invention relates to a modular combined track bed structure, comprising two rows of track panels and multiple steel plate beams. The two rows of track panels are arranged longitudinally and symmetrically. Each row of track panels includes an L-shaped angle steel longitudinal beam and longitudinally evenly distributed concrete support blocks on its outer side. Multiple steel plate beams are laterally connected between the two rows of track panels. The two track panels of this invention are bolted together by the L-shaped angle steel longitudinal beams and the spaced steel plate beams, forming a lateral load-bearing frame. This provides strong resistance to lateral bending moments and torsion, effectively resisting the lateral horizontal forces generated when a train passes and maintaining track gauge stability. Simultaneously, the connecting steel rods embedded in the concrete support blocks are welded to the longitudinally arranged L-shaped angle steel longitudinal beams, forming a strong longitudinal force transmission system. This effectively disperses the longitudinal loads generated during train starting and braking, preventing relative misalignment and settlement differences between the support blocks, and ensuring the long-term smoothness of the track geometry.

Description

Technical Field

[0001] This invention relates to a track bed structure for rail transit, specifically a modular combined track bed structure. Background Technology

[0002] The track bed is the foundation of the track structure, bearing train loads and maintaining the track's geometry. Currently, most monolithic track beds are constructed using on-site casting, which has significant drawbacks: a large amount of wet work is involved in on-site rebar tying, formwork erection, and concrete pouring, resulting in slow construction progress, long curing times, and severe dependence on weather conditions. More importantly, as a monolithically cast structure, once localized defects appear after operation, such as concrete cracking, damage, or uneven foundation settlement, repairs are extremely difficult. This often requires closing the track, removing the affected section, and recasting, severely disrupting normal operations and incurring high maintenance costs.

[0003] To overcome the drawbacks of cast-in-place track beds, the industry has begun exploring precast track beds. However, some precast solutions simply divide the track bed slabs into blocks, and their connection methods fail to form an effective and stable overall frame load-bearing system. This leads to relative displacement and misalignment between the precast blocks under long-term train dynamic loads, weakening the track bed's ability to withstand longitudinal and transverse horizontal forces. Other solutions precast the track bed under the left and right rails separately, forming independent longitudinal rail sections. While this achieves more thorough precasting, a reliable technical solution remains to be found for how to connect these two independent longitudinal rail sections laterally into a stable overall frame with higher precision and greater rigidity, while maintaining absolute ease of construction and high component replaceability.

[0004] Furthermore, from the perspective of track bed maintenance, traditional methods in the renovation and upgrading of existing track beds typically require the rails to be moved before a series of operations such as chiseling, cleaning, and repositioning of the track bed structure can be carried out. The rails must then be moved back to their original positions and the track restored before the track maintenance window ends. This repeated rail-moving process is extremely time-consuming, consuming a large amount of valuable track closure time, and causing significant disruption to train operations. Moreover, the accuracy of restoring the track geometry after rail-moving is difficult to guarantee.

[0005] Therefore, it is necessary to propose new measures to overcome the above-mentioned shortcomings. Summary of the Invention

[0006] The purpose of this invention is to provide a modular combined track bed structure to at least solve the problems of insufficient stability of the overall frame stress system and difficulty in ensuring the accuracy of geometric restoration during the renovation and upgrading of existing prefabricated assembled track bed structures.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A modular combined track bed structure is provided, which includes two rows of track panels and multiple steel plate crossbeams;

[0009] The two rail structures are arranged longitudinally and symmetrically on the left and right. Each rail structure includes an L-shaped angle steel longitudinal beam and concrete support blocks evenly distributed longitudinally on its outer side.

[0010] Multiple steel plate beams are laterally connected between the two rows of rail structure.

[0011] Furthermore, the L-shaped angle steel longitudinal beam has an L-shaped cross-section, including a flat beam and an outer vertical beam, with the vertical beam located below and to the outside of the flat beam.

[0012] Furthermore, the flat beam is provided with vertically penetrating longitudinal beam connection holes, and the ends of the steel plate crossbeam are correspondingly provided with vertically penetrating crossbeam connection holes.

[0013] The flat beam is placed above the end of the steel plate beam. The L-shaped angle steel longitudinal beam is fixedly connected to the end of the steel plate beam by inserting fastening bolts into the corresponding longitudinal beam connection holes and the transverse beam connection holes.

[0014] Furthermore, the concrete support block is fixedly connected to the outside of the vertical beam by a horizontal connecting steel rod.

[0015] Furthermore, the outer end of the connecting steel rod is pre-embedded in the concrete support block and located in the lower part of the concrete support block.

[0016] Furthermore, the inner end of the connecting steel rod is exposed and welded to the outer side of the vertical beam.

[0017] Furthermore, each of the concrete support blocks has two pre-embedded connecting steel rods, arranged symmetrically front and back.

[0018] Furthermore, two embedded sleeves for installing track fasteners are pre-embedded in the upper part of the concrete support block. The two embedded sleeves are arranged left and right and staggered front and back.

[0019] Furthermore, the pre-embedded sleeve is located above the connecting steel rod.

[0020] Furthermore, multiple steel plate beams are longitudinally and evenly arranged between the two rows of rail structure;

[0021] The steel plate beam corresponds laterally to the concrete support block, or laterally to the midpoint between the two concrete support blocks in the longitudinal direction.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention provides a modular combined track bed structure. The left and right track panels are bolted together with L-shaped angle steel longitudinal beams and spaced steel plate crossbeams to form a transverse load-bearing frame. This provides strong resistance to lateral bending moments and torsion, effectively resisting the lateral horizontal forces generated when trains pass and maintaining track gauge stability. Simultaneously, connecting steel rods embedded in the concrete support blocks are welded to the longitudinally arranged L-shaped angle steel longitudinal beams, forming a robust longitudinal force transmission system. This system effectively disperses the longitudinal loads generated during train starting and braking, preventing relative misalignment and settlement differences between the support blocks, and ensuring the long-term smoothness of the track geometry.

[0024] In addition, in the renovation and upgrading of existing ballastless tracks, the existing track bed can be partially removed, and then the modular combined track bed structure of this invention can be inserted under the track to replace the original part of the existing track bed, thus completing the renovation. The prefabricated track panel structure can be placed directly under the rail without the need for rail adjustment, and then the renovation can be completed by filling with a small amount of quick-setting concrete. This fundamentally avoids the adverse effects of repeated rail adjustment on construction efficiency and line operation, and can better maintain the track geometry, significantly shorten the operation time, and reduce interference with train operation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present 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 only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a plan view of a modular combined track bed structure provided in one embodiment of the present invention.

[0027] Figure 2 This is an elevation view of a modular combined track bed structure provided in one embodiment of the present invention.

[0028] Figure 3 This is a plan view of a single-sided track structure provided in one embodiment of the present invention.

[0029] Figure 4 This is a plan view of a steel plate beam provided in one embodiment of the present invention.

[0030] The diagram is labeled as follows:

[0031] 1- Track panel structure, 2- Steel plate crossbeam, 3- Fastening bolts;

[0032] 11-Concrete support block, 12-Embedded sleeve, 13-Connecting steel rod, 14-L-shaped angle steel longitudinal beam, 15-Weld;

[0033] 21-Crossbeam connection hole;

[0034] 31- Bolt rod, 32- Nut, 32- Washer;

[0035] 141 - Longitudinal beam connection hole. Detailed Implementation

[0036] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "longitudinal", "lateral", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this specific implementation, the direction of the track, i.e., the length of the track, is defined as longitudinal, and the direction perpendicular to it is defined as transverse. Longitudinal refers to front and back, and transverse refers to left and right. In addition, the direction closer to the centerline of the track is defined as the inner side, and the direction farther from the centerline of the track is defined as the outer side.

[0040] This invention provides a modular combined track bed structure, which uses prefabricated single-sided rail panels and transverse steel plate beams bolted together. It is a fully prefabricated assembled structure, suitable for sections of track engineering with seamless lines, short track windows, where track shifting is not allowed or not suitable, space is limited, and the requirements for operational interference control are high. It can be laid along the entire length and can also be used for track bed renovation and upgrading.

[0041] Specifically, such as Figure 1 The modular combined track bed structure includes two rows of track structures 1 and multiple steel plate beams 2. The two rows of track structures 1 are arranged longitudinally and are symmetrical from left to right, and the multiple steel plate beams 2 are connected laterally between the two rows of track structures 1.

[0042] Track panel structure 1 is a prefabricated structure, consisting of independent modules prefabricated in the factory. For example... Figure 3 The track panel structure 1 includes L-shaped angle steel longitudinal beams 14 and longitudinally evenly distributed concrete support blocks 11 on their outer sides. The L-shaped angle steel longitudinal beams 14 have an L-shaped cross-section and include a flat beam and an outer vertical plate beam. The vertical plate beams are located below and to the outside of the flat beam, i.e., bent downwards. Vertically penetrating longitudinal beam connection holes 141 are provided on the flat beam.

[0043] like Figure 4 The steel plate beam 2 is a rectangular steel plate, and its end has a vertically penetrating beam connection hole 21 at the position corresponding to the longitudinal beam connection hole 141. During installation, the flat beam is placed above the end of the steel plate beam 2, and the L-shaped angle steel longitudinal beam 14 is fixedly connected to the end of the steel plate beam 2 by inserting fastening bolts 3 into the corresponding longitudinal beam connection hole 141 and beam connection hole 21. The fastening bolt 3 includes a bolt shank 31, a nut 3, and a washer 33. During installation, the bolt shank 31 of the fastening bolt 3 is passed through the two holes from bottom to top, the washer 33 is installed, and the nut 32 is tightened.

[0044] In addition, such as Figure 2 The concrete support block 11 is fixedly connected to the outer side of the vertical beam by a horizontal connecting steel rod 13. The outer end of the connecting steel rod 13 is embedded in the concrete support block 11 and located in the lower part of the concrete support block 11, which is the anchoring section of the connecting steel rod 13. The inner end of the connecting steel rod 13 is exposed and welded to the outer side of the vertical beam to form a weld 15, which is the welded connection section of the connecting steel rod 13. Each concrete support block 11 has two connecting steel rods 13 embedded in it, arranged symmetrically front and back. Through the connecting steel rods 13, multiple concrete support blocks 11 distributed longitudinally are connected to a single L-shaped angle steel longitudinal beam 14 to form an integral single-sided rail panel structure 1.

[0045] Two embedded sleeves 12 are pre-embedded in the upper part of the concrete support block 11 for installing rail fasteners. They are arranged vertically and are used for later installation of fastener bolts to fix the rail. The two embedded sleeves 12 are arranged left and right and staggered front and back, located above the connecting steel rod 13 inside the concrete support block 11.

[0046] Multiple steel plate beams 2 are longitudinally and evenly arranged at predetermined intervals between two rows of track structures 1. For example... Figure 1 The steel plate beam 2 corresponds laterally to the concrete support block 11, or laterally to the midpoint between the two longitudinal concrete support blocks 11. The steel plate beam 2 connects the left and right track structures 1 laterally, and together they are assembled to form a stable frame-type modular track bed structure with overall lateral stiffness.

[0047] In manufacturing track panel structure 1, firstly, pre-embedded sleeves 12 and connecting steel rods 13 are precisely arranged on a prefabrication platform and spot-welded to form a reinforcing cage. Then, concrete is poured to form concrete support blocks 11 with several protruding ends of connecting steel rods 13. Multiple such concrete support blocks 11 are then precisely placed at intervals, ensuring that the ends of the protruding connecting steel rods 13 are tightly abutted against the outer side of the vertical beam of the L-shaped angle steel longitudinal beam 14, and welded together with weld seams 15 along the abutment edge. In this way, multiple independent concrete support blocks 11 are welded to a single L-shaped angle steel longitudinal beam 14 via connecting steel rods 13 to form a whole, i.e., track panel structure 1. All manufacturing processes of this track panel structure are completed before it is transported to the construction site.

[0048] The on-site construction of this invention includes the following steps:

[0049] First, the single-side rail panel structure 1 is hoisted into place as a reference for positioning;

[0050] Then, hoist the other side rail panel structure 1 and initially position it according to the design gauge;

[0051] Finally, the steel plate beams 2 are hoisted into place one by one, and all the fastening bolts 3 are inserted and tightened to complete the main structure assembly. Then, the fasteners and rails are installed.

[0052] In the later stages of maintenance, the renovation and upgrading of existing track beds usually requires repeated track adjustments, which is time-consuming, causes significant disruption to traffic, and has a long curing cycle for cast-in-place construction. However, in the structure of this invention, if a concrete support block 11 is found to be damaged, it can be removed separately and replaced with a new block and re-welded within the designated window period, simply by cutting off the weld 15 connecting it to the L-shaped angle steel longitudinal beam 14. If the steel plate crossbeam 2 needs to be replaced, only the fastening bolts 3 at both ends need to be removed.

[0053] In the renovation and upgrading of existing ballastless track, the existing ballastless track can be partially removed, and then the modular combined track bed structure of this invention can be inserted under the track to replace the existing ballastless track in part. The prefabricated track panel structure can be placed directly under the rail without the need for rail adjustment, and the renovation and upgrading can be completed by filling with a small amount of quick-setting concrete. This fundamentally avoids the adverse effects of repeated rail adjustment on construction efficiency and line operation, and can better maintain the track geometry, significantly shorten the operation time, and reduce interference with train operation.

[0054] The modular combined track bed structure provided by this invention achieves a greater degree of factory prefabrication, on-site dry bolt connection, and rapid and precise assembly. The resulting overall structure has excellent longitudinal and transverse load-bearing capacity, and all components can be replaced independently, facilitating the upgrading and renovation of existing ballastless track beds. Specifically, it has the following technical advantages:

[0055] 1. It realizes the prefabrication and fully dry connection of the track bed structure.

[0056] This invention fully integrates the fastener embedded parts (embedded sleeves 12) and force-transmitting steel rods (connecting steel rods 13) into individual concrete support blocks 11 through casting, and welds multiple concrete support blocks 11 and an L-shaped angle steel longitudinal beam 14 to form a single-sided rail panel—a prefabricated unit in the factory. This not only ensures high manufacturing precision and quality of each part, but also completely eliminates wet work during on-site construction, requiring only hoisting, positioning, and bolt tightening, significantly improving construction speed, eliminating curing time, and being unaffected by low temperatures and severe weather such as wind and rain.

[0057] 2. The structural stress system is advanced and has high overall stiffness.

[0058] The two track panel structures 1 of this invention are bolted together with L-shaped angle steel longitudinal beams 14 and spaced steel plate crossbeams 2 to form a transverse load-bearing frame. This provides strong resistance to lateral bending moment and torsion, effectively resisting the lateral horizontal force generated when a train passes and maintaining track gauge stability. Simultaneously, the connecting steel rods 13 embedded in the concrete support blocks 11 are welded to the longitudinal L-shaped angle steel longitudinal beams 14, forming a powerful longitudinal force transmission system. This system effectively disperses the longitudinal load generated during train start-up and braking, preventing relative misalignment and settlement differences between the support blocks, and ensuring the long-term smoothness of the track geometry.

[0059] 3. Construction precision is easy to control and it has good adaptability.

[0060] The track panel structure 1 of this invention is a prefabricated structure, and its key geometric parameters such as rail base slope and track gauge can be precisely controlled in the factory using high-precision molds and measurement methods. During on-site assembly, only the steel plate crossbeam 2 needs to be connected to the L-shaped angle steel longitudinal beams 14 on both sides of the track panel structure 1 by fastening bolts 3, which automatically achieves centering and track gauge locking. The operation is simple and the installation accuracy is high. It can realize the track bed renovation and upgrading under seamless track conditions, ensure the accuracy of track geometry and position, and reduce the workload of fine-tuning rail base slope, track gauge, etc.

[0061] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A modular combined track bed structure, characterized in that: The modular combined track bed structure includes two rows of track structure (1) and multiple steel plate beams (2); The two rail structure (1) are arranged longitudinally and symmetrically on the left and right. Each rail structure (1) includes an L-shaped angle steel longitudinal beam (14) and concrete support blocks (11) evenly distributed longitudinally on its outer side. Multiple steel plate beams (2) are laterally connected between two rows of track structures (1).

2. The modular combined track bed structure according to claim 1, characterized in that: The L-shaped angle steel longitudinal beam (14) has an L-shaped cross-section, including a flat beam and a vertical plate beam on its outer side, with the vertical plate beam located below the outer side of the flat beam.

3. The modular combined track bed structure according to claim 2, characterized in that: The flat beam is provided with a vertically penetrating longitudinal beam connection hole (141), and the end of the steel plate beam (2) is provided with a vertically penetrating transverse beam connection hole (21). The flat beam is placed above the end of the steel plate beam (2), and the L-shaped angle steel longitudinal beam (14) is fixedly connected to the end of the steel plate beam (2) by inserting fastening bolts (3) into the corresponding longitudinal beam connection hole (141) and the crossbeam connection hole (21).

4. The modular combined track bed structure according to claim 3, characterized in that: The concrete support block (11) is fixedly connected to the outside of the vertical beam by a horizontal connecting steel rod (13).

5. The modular combined track bed structure according to claim 4, characterized in that: The outer end of the connecting steel rod (13) is embedded in the concrete support block (11) and located in the lower part of the concrete support block (11).

6. The modular combined track bed structure according to claim 5, characterized in that: The inner end of the connecting steel rod (13) is exposed and welded to the outer side of the vertical plate beam.

7. A modular combined track bed structure according to claim 6, characterized in that: Each of the concrete support blocks (11) has two of the connecting steel rods (13) pre-embedded, arranged symmetrically front and back.

8. The modular combined track bed structure according to claim 7, characterized in that: The upper part of the concrete support block (11) is pre-embedded with two pre-embedded sleeves (12) for installing track fasteners. The two pre-embedded sleeves (12) are arranged left and right and staggered front and back.

9. The modular combined track bed structure according to claim 8, characterized in that: The pre-embedded sleeve (12) is located above the connecting steel rod (13).

10. The modular combined track bed structure according to claim 9, characterized in that: Multiple steel plate beams (2) are longitudinally and evenly arranged between two rows of rail structure (1); The steel plate beam (2) corresponds laterally to the concrete support block (11), or laterally to the midpoint between the two concrete support blocks (11) in the longitudinal direction.

Images