CN113981805B

CN113981805B - Bridge end track slab transverse deformation resistant structure under earthquake action

Info

Publication number: CN113981805B
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: 2023-05-16
Anticipated expiration: 2041-11-08
Also published as: CN113981805A

Abstract

The transverse deformation resistant structure of the bridge end track plate under the action of an earthquake is used for effectively improving 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 that the bridge is greatly deformed and displaced due to the earthquake. The bridge structure comprises a track plate arranged on a bridge structure at the adjacent part of the end part of the bridge and the abutment, wherein the adjacent track plate is longitudinally connected into a whole through a steel rail and a longitudinal connecting device, sliding mechanisms are fixedly arranged on the top surface of the bridge structure at intervals, the track plate is located on the sliding mechanisms, and the bridge structure can transversely swing relative to the track plate.

Description

Bridge end track slab transverse deformation resistant 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 bridge end track plate under the action of an earthquake.

Background

The track structure directly receives the load from the train and transmits it to the subgrade or the bridge-tunnel off-line foundation, the track structure must be strong and stable with the correct geometry to ensure safe operation of the train.

Along with frequent earthquake disasters in China in recent years, the damage of a track structure, such as cracking of a track plate, twisting of a steel rail and the like, is caused, and the safe running of a train is directly threatened. The bridge is greatly deformed under the action of earthquake, so that the damage of the ballastless track structure on the bridge is as outstanding. In the prior published patent, the earthquake-resistant track structure is used for resisting vibration load from a train or reducing vibration under the action of coupling power of a vehicle and a track, and aiming at vibration from a lower foundation under the action of earthquake, few reports are provided for reducing damage of earthquake waves to the track structure, and no earthquake-resistant design measures are considered in the current ballastless track structure design in China.

The bridge structure is suitable for the earthquake-resistant ballastless track structure under the action of earthquake according to three-level fortification that small earthquake is not bad, medium earthquake is repairable and large earthquake is not inverted in earthquake-resistant design, and has important significance.

Disclosure of Invention

The invention aims to solve the technical problem of providing the transverse deformation resistant structure of the bridge end track plate under the action of an earthquake so as to 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 technical scheme adopted for solving the technical problems is as follows:

the invention discloses a transverse deformation resistant structure of a bridge end track plate under the action of an earthquake, which comprises a track plate positioned on a bridge structure at the adjacent part of the bridge end and a bridge abutment, and is characterized in that: adjacent track slabs are longitudinally connected into a whole through steel rails and a longitudinal connecting device, sliding mechanisms are fixedly arranged on the top surface of the bridge structure at intervals, the track slabs are located on the sliding mechanisms, and the bridge structure can transversely swing relative to the track slabs; the sliding mechanism comprises a sliding groove component and a sliding shaft, wherein the sliding groove component is arranged below the track plate at intervals in the transverse direction and the longitudinal direction and is fixedly connected with the bridge structure; each chute member is provided with a transversely extending chute cavity, at least one sliding shaft is arranged in the chute cavity, the lower end face of the sliding shaft is seated on the bottom face of the chute cavity, the upper end face of the sliding shaft extends out of the port of the chute cavity, the bottom face of the track plate is seated on the upper end face of the sliding shaft, and the sliding shaft is fixedly connected with the track plate; the groove cavity of the chute component is arc-shaped; fixing cables are arranged in the groove cavity of the chute component at two lateral sides of the sliding shaft, and two ends of each fixing cable are connected with the side wall of the groove cavity in an anchoring manner; the fixed cable plays a role of a safety cable, when the safety cable is acted by normal wind load and tiny earthquake waves, the track structure transversely shakes relative to the bridge structure, and when a large earthquake occurs, the fixed cable is sheared under the transverse action of the bridge structure, and the sliding shaft slides along the arc-shaped groove cavity.

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

1. under the condition that the bridge is greatly deformed and displaced due to an earthquake, the bridge structure transversely swings relative to the track plate through the sliding mechanism, and the track plate can be kept motionless, so that the original geometric shape and position of the track structure are kept, and the earthquake resistance of the ballastless track structure on the bridge is effectively improved;

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

Drawings

The specification includes the following five drawings:

FIG. 1 is a perspective view of a bridge end rail plate transverse deformation resistant structure under the action of an earthquake of the invention;

FIG. 2 is a perspective view of the arrangement of chute members in the bridge end rail plate transverse deformation resistant structure of the present invention under the action of an earthquake;

FIG. 3 is a plan view of the arrangement of the chute members in the bridge end rail plate transverse deformation resistant structure of the present invention under the action of an earthquake;

FIG. 4 is a schematic diagram of the construction of a slip mechanism in a bridge end rail plate transverse deformation resistant structure under the action of an earthquake of the invention;

FIG. 5 is an enlarged view of a portion of the bridge end rail plate structure of the present invention in a partially expanded form for resisting lateral deformation under the action of an earthquake.

The components and corresponding indicia are shown: track plate 10, chute member 20, slide shaft 21, fixed cable 22, bridge structure 30, slot radius R, slot lateral length L.

Description of the embodiments

The invention will be further described with reference to the drawings and examples.

Referring to fig. 1, the structure for resisting transverse deformation of a bridge end rail plate under the earthquake action of the invention comprises a rail plate 10 positioned on a bridge structure 30 (a beam body and a bridge abutment) at the adjacent part of the bridge end and the bridge abutment, wherein the adjacent rail plates 10 are longitudinally connected into a whole through steel rails and a longitudinal connecting device, sliding mechanisms are fixedly arranged on the top surface of the bridge structure 30 at intervals, the rail plate 10 is located on the sliding mechanisms, and the bridge structure 30 can transversely swing relative to the rail plate 10. Under the condition that the bridge is greatly deformed and displaced due to an earthquake, the bridge structure 30 swings transversely relative to the track plate 10 through the sliding mechanism, and the track plate 10 can be kept motionless, so that the original geometric shape and position of the track structure are ensured, and the earthquake resistance of the ballastless track structure on the bridge is effectively improved. After the bridge structure 30 is reset after an earthquake, normal use of the original structure can be realized, and quick traffic is realized.

Referring to fig. 2 and 3, the sliding mechanism includes a sliding chute member 20 and a sliding shaft 21, wherein the sliding chute member 20 is disposed at a distance from each other transversely and longitudinally under the track slab 10, and is fixedly connected with the bridge structure 30. Each chute member 20 has a laterally extending chute cavity in which at least one slide shaft 21 is provided, the lower end surface of the slide shaft 21 being seated on the bottom surface of the chute cavity, the upper end surface extending out of the port of the chute cavity, and the bottom surface of the track plate 10 being seated on the upper end surface of the slide shaft 21. The arrangement quantity of the track boards 10 and the sliding mechanisms is determined according to the earthquake intensity level and the transverse action of the bridge.

Referring to fig. 3 and 4, as a preferred embodiment, the slot cavity of the chute member 20 has a circular arc shape, and the radius R and the transverse length L of the slot cavity are determined according to the seismic intensity level and the transverse action of the bridge. Referring to fig. 5, the slide shaft 21 is fixedly connected with the track plate 10. The inside of the groove cavity of the chute member 20 is provided with fixing cables 22 at two lateral sides of the sliding shaft 21, and two ends of the fixing cables 22 are connected with the side wall of the groove cavity in an anchoring manner. The securing cables 22 act as safety cables and the track structure may rock laterally relative to the bridge structure 30 under normal wind loads and micro seismic waves. When a large earthquake occurs, the fixed cable 22 is sheared under the transverse action of the bridge structure 30, and the sliding shaft 21 can slide along the arc-shaped groove cavity, so that the track structure is protected.

The foregoing is intended to illustrate the principles of the invention in its structure against lateral deformation for a bridge end rail slab under seismic action, and is not intended to limit the invention to the particular structure and application shown and described, but to limit the invention to all corresponding modifications and equivalents which may be employed, as long as they are within the scope of the invention as claimed.

Claims

1. The utility model provides an anti transverse deformation structure of bridge tip track board under earthquake effect, including being located track board (10) on bridge structure (30) of bridge tip and abutment adjacent position, characterized by: adjacent track plates (10) are longitudinally connected into a whole through steel rails and a longitudinal connecting device, sliding mechanisms are fixedly arranged on the top surface of the bridge structure (30) at intervals, the track plates (10) are located on the sliding mechanisms, and the bridge structure (30) can transversely swing relative to the track plates (10); the sliding mechanism comprises a sliding groove component (20) and a sliding shaft (21), wherein the sliding groove 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 chute component (20) is provided with a transversely extending chute cavity, at least one sliding shaft (21) is arranged in the chute cavity, the lower end face of the sliding shaft (21) is seated on the bottom face of the chute cavity, the upper end face extends out of the port of the chute cavity, the bottom face of the track plate (10) is seated on the upper end face of the sliding shaft (21), and the sliding shaft (21) is fixedly connected with the track plate (10); the groove cavity of the chute component (20) is arc-shaped; fixing cables (22) are arranged at two lateral sides of the sliding shaft (21) in a groove cavity of the sliding groove component (20), and two ends of each fixing cable (22) are connected with the side wall of the groove cavity in an anchoring manner; the fixed cable (22) plays a role of a safety cable, when the safety cable is acted by normal wind load and tiny earthquake waves, the track structure transversely shakes relative to the bridge structure (30), and when a large earthquake occurs, the fixed cable (22) is sheared under the transverse action of the bridge structure (30), and the sliding shaft (21) slides along the arc-shaped groove cavity.