A large displacement telescopic device for railway beam ends

Abstract

The present invention relates to the technical field of bridge structures, and aims to overcome some problems of the prior art. The invention provides a large-displacement telescopic device for railway beam ends, comprising a floating displacement box and a plurality of special-shaped sleepers arranged at intervals, wherein a supporting longitudinal beam is arranged inside the floating displacement box, and the floating displacement box is partially or completely buried in the ballast, and the special-shaped sleepers are connected to the floating displacement box, and the special-shaped sleepers include special-shaped fixed sleepers located above the beam body on both sides of the beam joint, and special-shaped movable sleepers located above the beam joint, the special-shaped fixed sleepers located at the beam ends and the ballast retaining walls at the same beam ends are constrained in the bridge direction by a fixed constraint structure, and the special-shaped fixed sleepers located at the beam ends are connected to all special-shaped movable sleepers by a displacement control device; the present invention can adapt to the linear adjustment of the line and match the stiffness of the ballasted roadbed, can meet the maintainability of large-machine tamping, and at the same time, the use of special-shaped sleepers increases the installation height of the supporting longitudinal beam, which can better adapt to the load-bearing requirements of railway large-displacement bridges.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge structures, and in particular to a large-displacement telescopic device for railway beam ends. Background Art

[0002] At present, the expansion joint structure types used in the beam ends of large-span railway bridges are mainly divided into fixed connection methods of connection support with the upper roadbed of the bridge and direct connection support with the bridge. The main difference is that the former is semi-buried with the ballasted roadbed on both sides of the beam joint through concrete sleepers, while the latter mainly uses steel structure sleepers and is connected to the bridge by consolidation of the bottom of the structure and the bridge beam end. The two structural types have their own advantages and disadvantages.

[0003] The structural type of expansion and contraction device connected to the trackbed features longitudinal beams placed above the sleepers. Due to track clearances, the beams' height is limited, making them inadequate for the large displacements required by bridges. Furthermore, this structure primarily relies on the anchoring force between the concrete sleepers and the ballast to provide longitudinal resistance during bridge expansion and contraction, which can easily lead to problems such as sleeper skew and track instability.

[0004] Directly connected to the bridge, the supporting expansion device has a longitudinal beam at the bottom of the structure. This reduces the cross-sectional height of the longitudinal beam by reserving it at the bridge beam end, thus accommodating the load-bearing requirements of bridges with large displacements. However, due to the direct connection of the bottom to the bridge, this structure also suffers from stiffness mismatch with the ballasted track on both sides, poor track insulation, and inability to perform large-scale tamping operations.

[0005] How to solve the problems existing in the current engineering applications of the two structural types has become a difficult technical problem to solve for large-displacement railway bridge expansion devices. Summary of the Invention

[0006] The present invention aims to provide a large displacement telescopic device for railway beam ends to solve the problems existing in engineering applications of the two current telescopic device structural types, namely, support connected to the upper track of a bridge and support directly connected to the bridge.

[0007] The present invention is achieved by adopting the following technical solutions:

[0008] A large displacement telescopic device for railway beam ends comprises a floating displacement box and a plurality of spaced-apart special-shaped sleepers, wherein a supporting longitudinal beam is arranged inside the floating displacement box, the floating displacement box is partially or completely buried in the ballast, the special-shaped sleepers are connected to the floating displacement box, the special-shaped sleepers comprise special-shaped fixed sleepers located above the beam body on both sides of the beam joint, and special-shaped movable sleepers located above the beam joint, the special-shaped fixed sleepers located at the beam ends and the ballast retaining wall at the same beam ends are constrained in the direction of the bridge through a fixed constraint structure, and the special-shaped fixed sleepers located at the beam ends are connected to all special-shaped movable sleepers through a displacement control device.

[0009] The displacement control device is used to ensure the uniformity of displacement of various movable sleepers in working condition.

[0010] Generally speaking, a beam joint refers to the gap between two adjacent beams in the direction along the bridge. The extension direction of the beam joint in the horizontal plane is the transverse direction of the bridge. The beam bodies on both sides of the beam joint in the above-mentioned "special-shaped fixed sleepers located above the beam bodies on both sides of the beam joint" refer to the beam bodies on the left and right sides of the beam joint in the transverse direction of the bridge.

[0011] The large-displacement telescopic device for railway bridges described in the present invention has a floating displacement box partially or completely buried inside the ballast and has no fixed connection with the bridge structure. It can achieve stiffness transition matching with the ballasted lines on both sides, large-scale machine tamping of the ballast on both sides, and track lifting adjustment.

[0012] The large-displacement telescopic device for railway bridges described in the present invention can not only adapt to the linear adjustment of the line and match the stiffness of the ballasted roadbed, but also simultaneously adopt special-shaped sleepers to set the displacement box height as much as possible between the ballast thickness and the rail gap, which can improve the installation height of the supporting longitudinal beam and the utilization rate of the height space, and effectively solve the problem of insufficient cross-sectional height of the supporting longitudinal beam of the railway telescopic device of the support type connected to the upper track of the bridge due to the limitation of the track limit, and can better adapt to the stiffness and bearing requirements of railway large-displacement bridges.

[0013] A ballast retaining wall is set at the beam end, and the special-shaped fixed sleeper at the beam end is connected and fixedly constrained with the ballast retaining wall at the same beam end through a fixed constraint structure, thereby realizing the longitudinal constraint of the special-shaped fixed sleeper, providing longitudinal constraint force for the telescopic device, improving the longitudinal resistance of the telescopic device, ensuring the morphological and positional stability of the track system at the beam end, and meeting the functional requirements of the beam end telescopic device of large-span bridges.

[0014] As the preferred technical solution:

[0015] The special-shaped fixed sleepers and the special-shaped movable sleepers are steel sleepers.

[0016] As the preferred technical solution:

[0017] The fixed constraint structure includes a T-shaped slot and an insulating sliding component, and the insulating sliding component is embedded and fixed in the T-shaped slot.

[0018] An insulating sliding assembly is provided in the T-shaped slot to achieve insulation between the telescopic device and the bridge.

[0019] As the preferred technical solution:

[0020] The supporting longitudinal beams are arranged on both sides of the beam body in the transverse direction of the bridge. The length direction of the supporting longitudinal beams is along the longitudinal direction of the bridge. The two ends of the supporting longitudinal beams are respectively placed in the floating displacement boxes on both sides of the beam seam.

[0021] As the preferred technical solution:

[0022] The floating displacement box includes a displacement box frame steel component, a displacement box upper support, a displacement box lower support, and a guide limit device. The displacement box upper support and the displacement box lower support are used to vertically constrain the supporting longitudinal beam, and the guide limit device is used to laterally constrain the supporting longitudinal beam. The displacement box frame steel component, the displacement box upper support, the displacement box lower support, and the guide limit device jointly constrain the supporting longitudinal beam in the longitudinal direction.

[0023] Wherein: the top of the upper support of the displacement box is fixed to the inner side of the top plate of the floating displacement box, the bottom of the lower support of the displacement box is fixed to the inner side of the bottom plate of the floating displacement box, the upper support of the displacement box and the lower support of the displacement box are both supports with rotation ability, and a first sliding mechanism is provided between the supporting longitudinal beam and the upper support of the displacement box and the lower support of the displacement box, forming a longitudinal sliding pair with the upper support of the displacement box and the lower support of the displacement box; the guide limit device is provided on the inner side of the side plate of the floating displacement box.

[0024] Among them, the longitudinal direction in the longitudinal guidance constraint refers to the direction along the bridge.

[0025] The above structure performs vertical, lateral and longitudinal guiding constraints on the supporting longitudinal beam, which not only realizes the vertical support constraint on the supporting longitudinal beam, but also can release the rotation and longitudinal relative displacement.

[0026] As the preferred technical solution:

[0027] The guide and limit devices are arranged on the left and right sides of the floating displacement box, and are used for the floating displacement box to provide longitudinal guidance, lateral and relative longitudinal limit constraints on the supporting longitudinal beam.

[0028] As the preferred technical solution:

[0029] The supporting longitudinal beam adopts an I-shaped structure or a C-shaped structure.

[0030] As the preferred technical solution:

[0031] When the supporting longitudinal beam adopts an I-shaped structure, the two ends of the special-shaped sleeper are upwardly tilted, and the ends thereof are formed with downwardly opening grooves. The two ends of the special-shaped fixed sleeper straddle the floating displacement boxes on both sides of the lateral side, and the special-shaped movable sleeper straddles the supporting longitudinal beams on both sides of the lateral side. The special-shaped movable sleeper is connected to the supporting longitudinal beams on both sides through a hanging railing device.

[0032] As the preferred technical solution:

[0033] The hanging fence device is fixedly connected to the special-shaped movable sleeper, and the supporting longitudinal beam is nested and penetrates the hanging fence device;

[0034] The hanging rail device includes a hanging rail frame steel component, a hanging rail upper support and a hanging rail lower support. The top of the hanging rail upper support is fixed to the inner side of the top plate of the hanging rail device, and the bottom of the hanging rail lower support is fixed to the inner side of the bottom plate of the hanging rail device. The hanging rail upper support and the hanging rail lower support are supports with rotation capability. A second sliding mechanism is provided between the supporting longitudinal beam and the hanging rail upper support and the hanging rail lower support, forming a longitudinal sliding pair with the hanging rail upper support and the hanging rail lower support.

[0035] The hanging rail device is used to realize the longitudinal displacement, vertical support and lateral limitation of the special-shaped movable sleeper.

[0036] As the preferred technical solution:

[0037] When the supporting longitudinal beam adopts an I-shaped structure, the two ends of the special-shaped sleeper are tilted downward, and the ends are formed with grooves opening upward. The floating displacement boxes on both sides of the lateral side sit in the grooves at both ends of the special-shaped fixed sleeper. The special-shaped movable sleeper is buckled and hung on the supporting longitudinal beams on both sides of the lateral side, and the special-shaped movable sleeper is connected to the supporting longitudinal beams on both sides by a suspension device and a slide device.

[0038] The suspension device and the slide plate device are used to realize the longitudinal displacement, vertical support and lateral limitation of the special-shaped movable sleeper.

[0039] As the preferred technical solution:

[0040] The two ends of the special-shaped sleeper are simultaneously tilted upward and downward, and a hollow groove is formed at the end. The floating displacement boxes on both sides are wrapped in the hollow groove of the special-shaped fixed sleeper, and the special-shaped movable sleeper wraps the supporting longitudinal beams on both sides. The hollow groove is provided with a hollow groove upper support, a hollow groove lower support, and a hollow groove lateral limit device.

[0041] The above structure is used to perform vertical, horizontal and longitudinal guiding constraints on the supporting longitudinal beams in the hollow groove.

[0042] As the preferred technical solution:

[0043] When the supporting longitudinal beam adopts a C-shaped structure, the two ends of the special-shaped sleeper are tilted upward, tilted downward, or kept horizontal, and the ends of the special-shaped fixed sleeper are inserted into the floating displacement boxes on both sides of the lateral side to cooperate with the C-shaped surface of the supporting longitudinal beam. An elastic device is provided between the supporting longitudinal beam and the special-shaped fixed sleeper above and below, and a limit device is provided in the lateral direction to achieve matching adjustment with the vertical stiffness of the line and longitudinal and lateral limit.

[0044] The end of the special-shaped movable sleeper is inserted into the groove on the supporting longitudinal beam and cooperates with its C-shaped surface. An elastic sliding device is provided between the supporting longitudinal beam and the special-shaped movable sleeper above and below, and a sliding limit device is provided laterally to achieve matching adjustment with the vertical stiffness of the line, longitudinal and transverse sliding guidance and lateral limitation.

[0045] As the preferred technical solution:

[0046] The ballast retaining wall is a welded steel structure part, which is fixed to the ends of the beam body on both sides of the beam seam.

[0047] As the preferred technical solution:

[0048] The special-shaped fixed sleepers at the beam ends are arranged above the ballast retaining wall at the beam ends. The displacement control device connects the two special-shaped fixed sleepers above the ballast retaining wall and the ends of all special-shaped movable sleepers in series to ensure the uniformity of displacement of each special-shaped movable sleeper in the working state.

[0049] As the preferred technical solution:

[0050] According to the combination of different special-shaped sleepers and supporting longitudinal beams, the displacement control device can be fixed on both sides or the bottom of the special-shaped sleeper.

[0051] As the preferred technical solution:

[0052] The special-shaped fixed sleeper and the special-shaped movable sleeper can be set to be tilted upward, or to be tilted downward, or to be a combination of the above two, or to be tilted upward and downward at the same time (forming a hollow groove).

[0053] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0054] The large-displacement telescopic device for railway bridges described in the present invention can not only adapt to the linear adjustment of the line and match the stiffness of the ballasted trackbed, but also simultaneously utilize special-shaped rail sleepers to maximize the displacement box height between the ballast thickness and the rail gap, thereby increasing the installation height of the supporting longitudinal beams and the utilization rate of the height space. This effectively solves the problem of insufficient cross-sectional height of the supporting longitudinal beams of railway telescopic devices connected to the upper track of the bridge due to track limits, and can better meet the stiffness and load-bearing requirements of large-displacement railway bridges. Ballast retaining walls are respectively provided at the beam ends on both sides of the beam seam. The special-shaped fixed sleepers at the beam ends are connected and fixedly constrained to the ballast retaining walls through a fixed constraint structure, which increases the longitudinal resistance of the telescopic device and ensures the dimensional and positional stability of the track system at the beam ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1a This is a schematic diagram of the axial structure of the large-displacement telescopic device for railway bridges described in the present invention.

[0056] Figure 1b This is a schematic diagram of the planar structure of the large-displacement telescopic device for railway bridges described in the present invention.

[0057] Figure 1c This is a schematic diagram of the longitudinal section structure of the large-displacement telescopic device for railway bridges described in the present invention.

[0058] Figure 1d This is a schematic diagram of the local structure of the ballast retaining wall of the large-displacement telescopic device for railway bridges described in the present invention.

[0059] Figure 2a This is a schematic structural diagram of the upwardly tilted end portion of the special-shaped sleeper according to the present invention.

[0060] Figure 2b This is a schematic structural diagram of the special-shaped sleeper of the present invention with its end tilted downward.

[0061] Figure 2c This is a schematic diagram of the structure in which the ends of the special-shaped sleeper of the present invention are tilted upward and downward at the same time.

[0062] Figure 3a for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted upward at the same time, the cross-section view in the AA direction is shown.

[0063] Figure 3b for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted upward at the same time, the cross-section view in the BB direction is shown.

[0064] Figure 3c for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted upward at the same time, the cross-sectional view in the CC direction is shown.

[0065] Figure 3d for Figure 3a Enlarged view of point I in the middle.

[0066] Figure 3e for Figure 3c Enlarged view of point II in the middle.

[0067] Figure 4a for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted downward at the same time, the cross-section view in the AA direction is shown.

[0068] Figure 4b for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted downward at the same time, the cross-sectional view in the BB direction is shown.

[0069] Figure 4c for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted downward at the same time, the cross-sectional view in the CC direction is shown.

[0070] Figure 5a for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted up and down at the same time, the cross-section view in the AA direction is shown.

[0071] Figure 5b for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted up and down at the same time, the cross-section view in the BB direction is shown.

[0072] Figure 5c for Figure 1b When the supporting longitudinal beam is I-shaped and the ends of the special-shaped sleepers are tilted up and down at the same time, the cross-sectional view in the CC direction is shown.

[0073] Figure 6a This is the cross-sectional view of the I-shaped supporting longitudinal beam.

[0074] Figure 6b It is a cross-sectional view of the C-shaped supporting longitudinal beam.

[0075] Figure 7a for Figure 1b The cross-section view in the AA direction is when the supporting longitudinal beam is C-shaped and the ends of the special-shaped sleepers are tilted downward at the same time.

[0076] Figure 7b for Figure 1b The cross-sectional view in the BB direction is when the supporting longitudinal beam is C-shaped and the ends of the special-shaped sleepers are tilted downward at the same time.

[0077] Figure 7c for Figure 1bCross-sectional view in CC direction when the supporting longitudinal beam is C-shaped and the ends of the special-shaped sleepers are tilted downward at the same time.

[0078] Figure 7d for Figure 7c Enlarged view of point III in the middle.

[0079] Figure 7e for Figure 7a Enlarged view of point IV in the middle.

[0080] Icons: 1-Special-shaped fixed sleeper, 2-Special-shaped movable sleeper, 3-Displacement control device, 4-Floating displacement box, 5-Supporting longitudinal beam, 6-Ballast retaining wall, 7-Fixed constraint structure, 8-Handrail device, 9-Hanging buckle device, 10-Slide plate device, 11-Elastic device, 12-Limiting device, 13-Elastic sliding device, 14-Sliding limiting device, 15-Rail, 16-Girder joint, 17-Roadbed, 18-Girder body, 19-Concrete sleeper (reference part), 41-Displacement box frame steel component, 42-Displacement box upper support, 43-Displacement box lower support, 44-Guide limiting device, 81-Handrail frame steel component, 82-Handrail upper support, 83-Handrail lower support, 71-T-slot, 72-Insulating sliding component. DETAILED DESCRIPTION

[0081] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0082] Example 1

[0083] See also Figure 1a-Figure 1d This embodiment provides a large-displacement expansion and contraction device for a railway bridge, comprising a special-shaped fixed sleeper 1, a special-shaped movable sleeper 2, and a displacement control device 3. A floating displacement box 4 is disposed at the bottom of the special-shaped fixed sleeper 1, and a supporting longitudinal beam 5 is disposed within the floating displacement box 4. The floating displacement box 4 is partially or fully buried within the ballast and has no fixed connection to the bridge structure. Figure 1c In FIG, h is the height of the track bed 17.

[0084] The supporting longitudinal beams 5 are provided on both sides of the beam body 18 in the transverse direction of the bridge. The length direction of the supporting longitudinal beams 5 is along the longitudinal direction of the bridge. The supporting longitudinal beams 5 span the beam gap 16 between the two beam bodies 18. The two ends of the supporting longitudinal beams 5 are respectively placed in the floating displacement boxes 4 at the bottom of the special-shaped fixed sleepers 1 on both sides of the beam gap 16. Steel ballast retaining walls 6 are fixed at the beam ends of the two beam bodies 18. The ballast retaining walls 6 are fixed at both ends of the beam gap 16. The special-shaped fixed sleepers 1 located on the ballast retaining walls 6 are connected to the ballast retaining walls 6 through the fixed constraint structure 7 to perform longitudinal bridge constraint, provide longitudinal constraint force for the telescopic device, ensure the morphological and positional stability of the track system at the beam end, and meet the functional requirements of the beam end telescopic device of the large-span bridge.

[0085] Specifically, the fixed restraint structure 7 includes a T-shaped slot 71 and an insulating sliding assembly 72. The insulating sliding assembly 72 is embedded and fixed in the T-shaped slot 71 and is used to achieve insulation between the telescopic device and the bridge. The top of the ballast retaining wall 6 is stuck in the T-shaped slot 71, and the insulating sliding assembly 72 is in contact with the ballast retaining wall 6.

[0086] See also Figure 2a 、 Figure 3a-3c 、 Figure 6a When the supporting longitudinal beam 5 adopts an I-shaped structure, the ends of the special-shaped fixed sleeper 1 and the special-shaped movable sleeper 2 can be simultaneously raised upward, and the two ends of the special-shaped fixed sleeper 1 straddle the floating displacement boxes 4 on both sides of the lateral side, and the special-shaped movable sleeper 2 straddles the supporting longitudinal beams 5 on both sides of the lateral side, and the special-shaped movable sleeper 2 is connected to the supporting longitudinal beams 5 on both sides by a hanging rail device 8 to realize the longitudinal displacement, vertical support and lateral limitation of the special-shaped movable sleeper 2.

[0087] The displacement control device 3 connects the two special-shaped fixed sleepers 1 and the ends of all special-shaped movable sleepers 2 located above the ballast retaining wall 6 in series, and the displacement control device 3 is fixed on both sides of the special-shaped sleepers.

[0088] See also Figure 3d and Figure 3e The floating displacement box 4 includes a displacement box frame steel component 41, a displacement box upper support 42, a displacement box lower support 43, and a guide limiter 44. The displacement box upper support 42 and the displacement box lower support 43 are used to vertically constrain the supporting longitudinal beam 5, and the guide limiter 44 is used to laterally constrain the supporting longitudinal beam 5. The displacement box frame steel component 41, the displacement box upper support 42, the displacement box lower support 43, and the guide limiter 44 jointly constrain the supporting longitudinal beam 5 in the longitudinal direction.

[0089] Among them: the top of the displacement box upper support 42 is fixed to the inner side of the top plate of the floating displacement box 4, and the bottom of the displacement box lower support 43 is fixed to the inner side of the bottom plate of the floating displacement box 4. The displacement box upper support 42 and the displacement box lower support 43 are both supports with rotation ability. A first sliding mechanism is provided between the supporting longitudinal beam 5 and the displacement box upper support 42 and the displacement box lower support 43, forming a longitudinal sliding pair with the displacement box upper support 42 and the displacement box lower support 43; the guide limit device 44 is arranged on the left and right sides of the floating displacement box 4.

[0090] In this embodiment, the special-shaped fixed sleeper 1 and the special-shaped movable sleeper 2 are steel sleepers.

[0091] Example 2

[0092] The difference between this embodiment and embodiment 1 is that:

[0093] See also Figure 2b 、 Figure 4a-4c The special-shaped fixed sleeper 1 and the special-shaped movable sleeper 2 can simultaneously adopt the ends to be tilted downward, and the floating displacement boxes 4 on both sides of the lateral side sit in the grooves at both ends of the special-shaped fixed sleeper 1. The special-shaped movable sleeper 2 is buckled and hung on the supporting longitudinal beams 5 on both sides of the lateral side, and the special-shaped movable sleeper 2 and the supporting longitudinal beams 5 on both sides are connected by a suspension device 9 and a slide device 10 to realize the longitudinal displacement, vertical support and lateral limitation of the special-shaped movable sleeper 2.

[0094] Specifically, the suspension device 9 and the slide device 10 are arranged in the groove at the end of the special-shaped movable sleeper 2, the slide device 10 is arranged at the bottom of the floating displacement box 4, and the suspension device 9 is arranged on the side of the floating displacement box 4, and clamps the lower flange of the I-shaped supporting longitudinal beam 5.

[0095] Example 3

[0096] The difference between this embodiment and embodiment 1 is that:

[0097] See also Figure 2c 、 Figure 5a-5c The special-shaped fixed sleeper 1 and the special-shaped movable sleeper 2 can simultaneously adopt the ends to be tilted downward and upward, and hollow grooves are formed at the ends. The floating displacement boxes 4 on both sides of the lateral direction are wrapped in the hollow groove of the special-shaped fixed sleeper 1, and the special-shaped movable sleeper 2 wraps the supporting longitudinal beams 5 on both sides of the lateral direction. The hollow groove is provided with a hollow groove upper support, a hollow groove lower support, and a hollow groove lateral limit device.

[0098] Example 4

[0099] The difference between this embodiment and embodiment 1 is that:

[0100] See also Figure 6b 、 Figure 7a-7e When the supporting longitudinal beam 5 adopts a C-shaped structure, the beam ends of the special-shaped fixed sleeper 1 are inserted into the floating displacement boxes 4 on both sides of the lateral side to cooperate with the C-shaped surface of the supporting longitudinal beam 5. The elastic device 11 and the limit device 12 are used between the supporting longitudinal beam 5 and the special-shaped fixed sleeper 1 above and below to achieve matching adjustment of the vertical stiffness of the line and longitudinal and lateral limitations.

[0101] The beam end of the special-shaped movable sleeper 2 is also inserted into the C-shaped surface of the supporting longitudinal beam 5 for cooperation. An elastic sliding device 13 is used between the supporting longitudinal beam 5 and the special-shaped fixed sleeper 1 above and below, and a sliding limit device 14 is used laterally to achieve matching adjustment with the vertical stiffness of the line and longitudinal and transverse sliding guidance and lateral limitation.

[0102] The ends of the special-shaped fixed sleeper 1 and the special-shaped movable sleeper 2 are tilted upward, downward or in parallel combination, which all meet the above content in Example 4. The accompanying drawings only show a form in which the special-shaped fixed sleeper 1 and the special-shaped movable sleeper 2 are tilted downward at the same time, but are not limited to the form shown in the accompanying drawings.

[0103] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A railway beam end large displacement telescopic device, characterized by: It includes a floating displacement box and a plurality of spaced-apart special-shaped sleepers, wherein a supporting longitudinal beam is provided inside the floating displacement box, the floating displacement box is partially or completely buried in the ballast, the special-shaped sleepers are connected to the floating displacement box, and the special-shaped sleepers include special-shaped fixed sleepers located above the beam body on both sides of the beam joint and special-shaped movable sleepers located above the beam joint. The special-shaped fixed sleepers located at the beam ends and the ballast retaining walls at the same beam ends are constrained in the bridge direction through a fixed constraint structure, and the special-shaped fixed sleepers located at the beam ends are connected to all special-shaped movable sleepers through a displacement control device; The fixed constraint structure includes a T-shaped slot and an insulating sliding component, and the insulating sliding component is embedded and fixed in the T-shaped slot; The supporting longitudinal beams are provided on both sides of the beam body in the transverse direction of the bridge, the length direction of the supporting longitudinal beams is along the longitudinal direction of the bridge, and the two ends of the supporting longitudinal beams are respectively placed in the floating displacement boxes on both sides of the beam seam; The floating displacement box includes a displacement box frame steel component, a displacement box upper support, a displacement box lower support, and a guide limit device. The displacement box upper support and the displacement box lower support are used to vertically constrain the supporting longitudinal beam, and the guide limit device is used to laterally constrain the supporting longitudinal beam. The displacement box frame steel component, the displacement box upper support, the displacement box lower support, and the guide limit device jointly constrain the supporting longitudinal beam in the longitudinal direction. Wherein: the top of the displacement box upper support is fixed to the inner side of the top plate of the floating displacement box, the bottom of the displacement box lower support is fixed to the inner side of the bottom plate of the floating displacement box, the displacement box upper support and the displacement box lower support are both supports with rotation capability, a first sliding mechanism is provided between the supporting longitudinal beam and the displacement box upper support and the displacement box lower support, forming a longitudinal sliding pair with the displacement box upper support and the displacement box lower support; the guide limit device is provided on the inner side of the side plate of the floating displacement box; The supporting longitudinal beam adopts an I-shaped structure or a C-shaped structure.

2. The railway beam end large displacement telescopic device according to claim 1, characterized in that: When the supporting longitudinal beam adopts an I-shaped structure, the two ends of the special-shaped sleeper are upwardly tilted, and the ends thereof are formed with downwardly opening grooves. The two ends of the special-shaped fixed sleeper straddle the floating displacement boxes on both sides of the lateral side, and the special-shaped movable sleeper straddles the supporting longitudinal beams on both sides of the lateral side. The special-shaped movable sleeper is connected to the supporting longitudinal beams on both sides through a hanging railing device.

3. The railway beam end large displacement telescopic device according to claim 2, characterized in that: The hanging fence device is fixedly connected to the special-shaped movable sleeper, and the supporting longitudinal beam is nested and penetrates the hanging fence device; The hanging rail device includes a hanging rail frame steel component, a hanging rail upper support and a hanging rail lower support. The top of the hanging rail upper support is fixed to the inner side of the top plate of the hanging rail device, and the bottom of the hanging rail lower support is fixed to the inner side of the bottom plate of the hanging rail device. The hanging rail upper support and the hanging rail lower support are supports with rotation capability. A second sliding mechanism is provided between the supporting longitudinal beam and the hanging rail upper support and the hanging rail lower support, forming a longitudinal sliding pair with the hanging rail upper support and the hanging rail lower support.

4. The railway beam end large displacement telescopic device according to claim 1, characterized in that: When the supporting longitudinal beam adopts an I-shaped structure, the two ends of the special-shaped sleeper are tilted downward, and the ends are formed with grooves opening upward. The floating displacement boxes on both sides of the lateral side sit in the grooves at both ends of the special-shaped fixed sleeper. The special-shaped movable sleeper is buckled and hung on the supporting longitudinal beams on both sides of the lateral side, and the special-shaped movable sleeper is connected to the supporting longitudinal beams on both sides by a suspension device and a slide device.

5. The railway beam end large displacement telescopic device according to claim 1, characterized in that: The two ends of the special-shaped sleeper are simultaneously tilted upward and downward, and a hollow groove is formed at the end. The floating displacement boxes on both sides are wrapped in the hollow groove of the special-shaped fixed sleeper, and the special-shaped movable sleeper wraps the supporting longitudinal beams on both sides. The hollow groove is provided with a hollow groove upper support, a hollow groove lower support, and a hollow groove lateral limit device.

6. The railway beam end large displacement telescopic device according to claim 1, characterized in that: When the supporting longitudinal beam adopts a C-shaped structure, the two ends of the special-shaped sleeper are tilted upward, tilted downward, or kept horizontal, and the ends of the special-shaped fixed sleeper are inserted into the floating displacement boxes on both sides of the lateral side to cooperate with the C-shaped surface of the supporting longitudinal beam. An elastic device is provided between the supporting longitudinal beam and the special-shaped fixed sleeper above and below, and a limit device is provided laterally; The end of the special-shaped movable sleeper is inserted into the groove on the supporting longitudinal beam and matched with its C-shaped surface. An elastic sliding device is provided between the supporting longitudinal beam and the special-shaped movable sleeper above and below, and a sliding limit device is provided laterally.

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