CN113981805A

CN113981805A - Bridge end track slab transverse deformation resisting structure under earthquake action

Info

Publication number: CN113981805A
Application number: CN202111310597.6A
Authority: CN
Inventors: 谢毅; 徐浩; 胡连军; 曾永平; 蔡文锋; 杨文茂; 林红松; 熊维; 曹保; 张威风; 罗圆; 余浩伟; 鄢红英; 寇峻瑜
Original assignee: China Railway Eryuan Engineering Group Co Ltd CREEC
Current assignee: China Railway Eryuan Engineering Group Co Ltd CREEC
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-01-28
Anticipated expiration: 2041-11-08
Also published as: CN113981805B

Abstract

The transverse deformation resisting structure of the track slab at the end part of the bridge under the action of the earthquake can effectively improve the earthquake resistance of the ballastless track structure on the bridge, and the track structure can keep the original geometric shape and position under the condition of large deformation displacement of the bridge caused by the earthquake. The bridge structure comprises track plates located on bridge structures at the end parts of bridges and adjacent bridge abutments, wherein the adjacent track plates are longitudinally connected into a whole through steel rails and longitudinal connecting devices, a sliding mechanism is fixedly arranged on the top surface of the bridge structure at intervals, the track plates are located on the sliding mechanism, and the bridge structure can transversely swing relative to the track plates.

Description

Bridge end track slab transverse deformation resisting structure under earthquake action

Technical Field

The invention belongs to the technical field of railway track traffic, and particularly relates to a transverse deformation resistant structure of a track slab at the end part of a bridge under the action of earthquake.

Background

The track structure directly bears the load from the train and transfers the load to the foundation under the line, such as a roadbed, a bridge, a tunnel and the like, and the track structure must be firm and stable and have correct geometric configuration and position so as to ensure the safe operation of the train.

With frequent earthquake disasters in China in recent years, the damage of a track structure, such as track plate cracking, steel rail twisting and the like, is caused, and the safe operation of a train is directly threatened. The bridge deforms greatly under the action of earthquake, so that the damage of a ballastless track structure on the bridge is prominent. In the prior published patent, an anti-seismic track structure is used for resisting vibration load from a train or reducing vibration under the action of vehicle-track coupling power, and the damage of seismic waves to the track structure is rarely reported aiming at the vibration from a lower foundation under the action of an earthquake, and the anti-seismic design measure is not considered in the structural design of the ballastless track in China at present.

The bridge structure is designed in an earthquake-proof manner according to three levels of 'small earthquake is not damaged, medium earthquake can be repaired, and large earthquake is not fallen', so that the research on the structure of the earthquake-proof ballastless track under the action of the earthquake is carried out to be suitable for the bridge structure, and the method has important significance.

Disclosure of Invention

The invention aims to provide a transverse deformation resistant structure of a track slab at the end part of a bridge under the action of earthquake, so that the earthquake resistant performance of a ballastless track structure on the bridge is effectively improved, and the track structure can keep the original geometric shape and position under the condition of large deformation and displacement of the bridge caused by the earthquake.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the invention relates to a transverse deformation resistant structure of a track slab at the end part of a bridge under the action of an earthquake, which comprises the track slab on a bridge structure at the adjacent part of the end part of the bridge and a bridge abutment, and is characterized in that: the adjacent track plates are longitudinally connected into a whole through the steel rails and the longitudinal connecting device, the sliding mechanisms are fixedly arranged on the top surface of the bridge structure at intervals, the track plates are located on the sliding mechanisms, and the bridge structure can transversely swing relative to the track plates.

The sliding mechanism comprises a sliding chute component and a sliding shaft, wherein the sliding chute component is arranged below the track slab at intervals in the transverse and longitudinal directions and is fixedly connected with the bridge structure; each sliding chute component is provided with a transversely extending groove cavity, at least one sliding shaft is arranged in each groove cavity, the lower end face of each sliding shaft is located on the bottom face of each groove cavity, the upper end face of each sliding shaft extends out of the port of each groove cavity, and the bottom face of each track plate is located on the upper end face of each sliding shaft.

The groove cavity of the sliding groove component is arc-shaped.

The beneficial effects of the invention are mainly reflected in the following aspects:

under the condition of large deformation displacement of a bridge caused by an earthquake, a bridge structure transversely swings relative to a track board through a sliding mechanism, and the track board can be kept still, so that the original geometric form and position of the track structure are kept, and the earthquake resistance of a ballastless track structure on a bridge is effectively improved;

after the earthquake, the bridge structure can be reset, normal use of the original structure can be realized, and quick traffic can be realized.

Drawings

The specification includes the following five figures:

FIG. 1 is a perspective view of a structure for resisting transverse deformation of a track slab at the end of a bridge under the action of an earthquake according to the present invention;

FIG. 2 is a perspective view showing the arrangement of the chute members in the transverse deformation resisting structure of the track slab at the end of the bridge under the action of an earthquake;

FIG. 3 is a plan view showing the arrangement of the chute members in the transverse deformation resisting structure of the track slab at the end of the bridge under the action of an earthquake;

FIG. 4 is a schematic diagram showing the structure of a sliding mechanism in the transverse deformation resisting structure of the track slab at the end of the bridge under the action of an earthquake;

fig. 5 is a partially enlarged schematic view of the structure of the invention for resisting transverse deformation of the track slab at the end of the bridge under the action of earthquake.

The figures show the components and corresponding references: the track plate 10, the chute member 20, the sliding shaft 21, the fixing cable 22 and the bridge structure 30, the radius R of the slot cavity and the transverse length L of the slot cavity.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Referring to fig. 1, the structure for resisting transverse deformation of the track slab at the end of the bridge under the action of an earthquake comprises track slabs 10 located on bridge structures 30 (beam bodies and bridge abutments) at the positions adjacent to the bridge ends and the bridge abutments, wherein the adjacent track slabs 10 are longitudinally connected into a whole through steel rails and longitudinal connecting devices, sliding mechanisms are fixedly arranged on the top surfaces of the bridge structures 30 at intervals, the track slabs 10 are located on the sliding mechanisms, and the bridge structures 30 can transversely swing relative to the track slabs 10. Under the condition that the bridge is subjected to large deformation displacement due to an earthquake, the bridge structure 30 transversely swings relative to the track slab 10 through the sliding mechanism, and the track slab 10 can be kept still, so that the original geometric shape and position of the track structure are kept, and the anti-seismic performance of the ballastless track structure on the bridge is effectively improved. After the bridge structure 30 can be reset after an earthquake, the normal use of the original structure can be realized, and the rapid traffic can be realized.

Referring to fig. 2 and 3, the sliding mechanism includes a chute member 20 and a sliding shaft 21, and the chute member 20 is disposed below the track plate 10 at a lateral and longitudinal interval and fixedly connected to the bridge structure 30. Each runner component 20 has a transversely extending cavity in which at least one runner 21 is disposed, the lower end face of the runner 21 is seated on the bottom face of the cavity, the upper end face of the runner 21 protrudes out of the cavity port, and the bottom face of the track plate 10 is seated on the upper end face of the runner 21. The arrangement quantity of the track slabs 10 and the sliding mechanisms is determined according to the seismic intensity grade and the transverse action of the bridge.

Referring to fig. 3 and 4, as a preferred embodiment, the cavity of the chute member 20 is arc-shaped, and the radius R and the transverse length L of the cavity are determined according to the seismic intensity level and the transverse action of the bridge. Referring to fig. 5, the sliding shaft 21 is fixedly connected to the track plate 10. The fixed cables 22 are arranged at the two lateral sides of the sliding shaft 21 in the groove cavity of the chute component 20, and the two ends of the fixed cables 22 are connected with the side walls of the groove cavity in an anchoring manner. The anchor cable 22 acts as a safety cable and through the track structure can rock laterally of the bridge structure 30 under normal wind loads and microwave seismic events. When a large earthquake occurs, under the transverse action of the bridge structure 30, the fixed cable 22 is sheared, and the sliding shaft 21 can slide along the arc-shaped slot cavity, so that the track structure is protected.

The foregoing is illustrative of the principles of the present invention for the transverse deformation resistant construction of a track plate at the end of a bridge under seismic conditions and is not intended to limit the invention to the specific constructions and applications shown and described, and it is intended to cover all modifications and equivalents thereof which may be resorted to, falling within the scope of the invention.

Claims

1. Anti transverse deformation structure of bridge tip track board under seismic action, including track board (10) that are located bridge tip and abutment adjacent position bridge structures (30), characterized by: the adjacent track plates (10) are longitudinally connected into a whole through steel rails and longitudinal connecting devices, a sliding mechanism is fixedly arranged on the top surface of the bridge structure (30) at intervals, the track plates (10) are located on the sliding mechanism, and the bridge structure (30) can transversely swing relative to the track plates (10).

2. The structure of claim 1 for resisting lateral deformation of a track slab at the end of a bridge under the action of an earthquake, which is characterized in that: the sliding mechanism comprises a sliding chute component (20) and a sliding shaft (21), wherein the sliding chute component (20) is arranged below the track plate (10) at intervals in the transverse direction and the longitudinal direction and is fixedly connected with the bridge structure (30); each sliding chute component (20) is provided with a transversely extending groove cavity, at least one sliding shaft (21) is arranged in each groove cavity, the lower end face of each sliding shaft (21) is located on the bottom face of each groove cavity, the upper end face of each sliding shaft extends out of a port of each groove cavity, and the bottom face of each track plate (10) is located on the upper end face of each sliding shaft (21).

3. The structure of claim 2 for resisting lateral deformation of a track slab at the end of a bridge under the action of an earthquake, which is characterized in that: the groove cavity of the sliding groove component (20) is arc-shaped.

4. The structure of claim 3 for resisting lateral deformation of a track slab at the end of a bridge under the action of an earthquake, wherein: the sliding shaft (21) is fixedly connected with the track plate (10).

5. The structure of claim 4 for resisting lateral deformation of a track slab at the end of a bridge under the action of an earthquake, wherein: and fixed cables (22) are arranged at the two transverse sides of the sliding shaft (21) in the groove cavity of the chute component (20), and the two ends of each fixed cable (22) are connected with the side wall of the groove cavity in an anchoring manner.