A support with a seismic isolation device for a long-span continuous beam
By designing a bridge support with a shock isolation device, using spherical sliding and limiting structures, the longitudinal one-way and lateral displacement of the bridge support in the shock absorption design is solved, and the lateral shock absorption and stability of the bridge are improved. Suitable for railway bridges with large span continuous beams.
Patent Information
- Application Number
- CN201910734606.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-08-09
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2039-08-09
AI Technical Summary
The existing bridge support has longitudinal one-way shock absorption and lateral displacement problems in the shock absorption design, resulting in unstable bridge structure, and friction swing support cannot be used on railway bridges, which cannot meet the horizontal rotation angle of large span continuous beams and Horizontal movement requirements.
A support with a shock isolation device for a large span continuous beam is designed, including an upper plate, a ball crown lining plate, a curved plate and a lower plate. The horizontal direction of the bridge is realized through a planar slide, a spherical slide and a longitudinal bridge limit structure. and longitudinal limits, combined with the spherical sliding surface and sealing ring, provide lateral shock absorption function, and achieve lateral damping shock absorption through the swing of the curved panel and the lower panel during earthquakes.
This support meets the bridge function in normal use and provides effective shock absorption during transverse and vertical displacement, avoids lateral elevation, enhances the stability and seismic resistance of the bridge structure, and reduces the damage to the bridge by earthquakes.
Smart Images
Figure CN110396922B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a support with a seismic isolation device for a large-span continuous beam, belonging to the technical field of roads and bridges. Background Art
[0002] With the continuous advancement of national railway construction, many railway lines need to pass through high-intensity earthquake zones, which requires that bridges be designed to reduce shock during construction.
[0003] At present, there are many ways to achieve the shock absorption function on bridges, generally using friction pendulum bearings or viscous dampers. Viscous dampers can only achieve shock absorption in a single direction (generally longitudinal); while friction pendulum bearings will cause the bridge to have vertical displacement, generating secondary internal forces on the bridge's statically indeterminate structure, which is not conducive to the stability of the bridge structure system. Friction pendulum bearings are rarely used on railway bridges. Therefore, bridges generally use earthquake-resistant structures in the transverse direction, which will cause the transverse earthquake force to have a large impact on the bridge structure and cause damage to the bridge.
[0004] For long-span continuous beams, the bridge support system should not only meet the normal horizontal and longitudinal limits and vertical rotations, but also the horizontal rotation of the bridge. This requires that the bridge support system should not only be horizontally limited at the beam end, but also the bearings at other positions should be able to move both horizontally and longitudinally.
[0005] When designing the seismic isolation of a bridge, a viscous damper is used for longitudinal vibration reduction, and the bearing itself is used for lateral vibration reduction. Conventional bearings do not have the vibration reduction function, and the friction pendulum bearing with the vibration reduction function cannot be used on railway bridges. Therefore, a new type of bearing is needed that can meet the normal use function of the bridge and has the vibration reduction function. Summary of the invention
[0006] The object of the present invention is to provide a support with a seismic isolation device for a large-span continuous beam in order to solve the above-mentioned problems, which can not only meet the normal use function of the bridge, but also has a shock-absorbing function.
[0007] The technical solution adopted in the present invention is as follows:
[0008] A support with a seismic isolation device for a large-span continuous beam comprises, from top to bottom, an upper plate, a spherical crown lining plate, a curved plate and a lower plate. A flat slide plate is arranged between the bottom surface of the upper plate and the top plane of the spherical crown lining plate, and a transverse bridge limiting structure is arranged on the bottom surface of the upper plate to limit the spherical crown lining plate on both sides in the transverse bridge direction. An upper spherical slide plate is arranged between the bottom spherical surface of the spherical crown lining plate and the top concave surface of the curved plate. A lower spherical slide plate is arranged between the bottom curved surface of the curved plate and the top concave surface of the lower plate. A longitudinal bridge limiting structure is arranged on the lower plate to limit the curved plate on both sides in the longitudinal bridge direction.
[0009] In summary, due to the adoption of the above technical solution, the present invention can not only meet the normal use function of the bridge, but also has the lateral shock absorption function.
[0010] Under normal working conditions, due to the lateral limitation between the upper plate and the side of the spherical crown lining, the longitudinal plane between the upper plate and the spherical crown lining slides to adapt to the longitudinal temperature displacement of the bridge, while the lower structure of this bearing is longitudinally limited and cannot move longitudinally, and no longitudinal lifting will be generated. The side of the curved panel and the lower plate are longitudinally limited. When the beam body is displaced laterally, the upper plate drives the spherical crown lining and the curved panel to slide laterally to adapt to the lateral temperature displacement of the bridge. The lateral sliding surface is a curved surface, but because the lateral displacement of the bridge system is very small, the lateral lifting generated is very small and has no effect on the stress of the bridge structure. The sliding surface between the spherical crown lining and the curved panel is a spherical surface. When the bridge is vertically deflected and horizontally twisted, this bearing can simultaneously adapt to the angles generated by the vertical deflection and horizontal twisting of the bridge.
[0011] During an earthquake, the upper structure of the bearing can swing along the spherical surface between the curved plate and the lower plate. Since the curved plate and the side of the lower plate are limited, the bridge can only swing in the horizontal direction, realizing the damping and shock absorption function in the horizontal direction. In addition, limit devices are set at both ends of the lower plate to prevent the beam from falling due to excessive lateral displacement.
[0012] Preferably, the plane slide is fixed integrally with the top plane of the spherical crown lining plate, the upper spherical slide is fixed integrally with the top concave surface of the curved plate and forms an upper spherical sliding pair with the bottom spherical surface of the spherical crown lining plate, and the lower spherical slide is fixed integrally with the bottom curved surface of the curved plate and forms a lower spherical sliding pair with the top concave surface of the lower plate. Further preferably, a sealing ring is embedded around the plane slide on the top plane of the spherical crown lining plate.
[0013] Preferably, the material of the lower spherical skateboard is different from that of the plane skateboard and the upper spherical skateboard, and the friction coefficient between the lower spherical skateboard and the lower plate is greater than the friction coefficient between the plane skateboard and the upper plate and the friction coefficient between the upper spherical skateboard and the bottom spherical surface of the spherical crown lining plate. Further preferably, the plane skateboard and the upper spherical skateboard are made of modified ultra-high molecular weight polyethylene or modified polytetrafluoroethylene and lubricated with silicone grease, and the lower spherical skateboard is made of modified polytetrafluoroethylene but not lubricated with silicone grease. The skateboard material used by the lower spherical skateboard is different from that of the plane skateboard and the upper spherical skateboard, and the friction coefficient between the lower spherical skateboard and the lower plate is large, and the shock absorption and energy consumption effect is good.
[0014] Preferably, the upper and lower surfaces of the lower spherical slide plate are both spherical surfaces, and the concave surface on the top of the lower plate is a spherical surface that matches the lower surface of the lower spherical slide plate.
[0015] Preferably, grooves are provided on both longitudinal sides of the top of the lower plate, and the longitudinal bridge limiting structure is installed in the grooves to limit the curved plate longitudinally. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a transverse bridge schematic diagram of the present invention.
[0017] Figure 2 It is a longitudinal bridge schematic diagram of the present invention.
[0018] Markings in the figure: 1 is an upper plate, 2 is a flat slide plate, 3 is a sealing ring, 4 is a spherical crown lining plate, 5 is an upper spherical slide plate, 6 is a curved plate, 7 is a lower spherical slide plate, 8 is a lower plate, 9 is a transverse bridge limiting structure, and 10 is a longitudinal bridge limiting structure. DETAILED DESCRIPTION
[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0020] Example:
[0021] like Figure 1 , 2 As shown, a support with a seismic isolation device for a large-span continuous beam comprises, from top to bottom, an upper plate 1, a spherical crown lining plate 4, a curved plate 6 and a lower plate 8. A flat slide plate 2 is arranged between the bottom surface of the upper plate 1 and the top plane of the spherical crown lining plate 4, and a transverse bridge limiting structure 9 is arranged on the bottom surface of the upper plate 1 to limit the spherical crown lining plate 4 on both sides in the transverse bridge direction. An upper spherical slide plate 5 is arranged between the bottom spherical surface of the spherical crown lining plate 4 and the top concave surface of the curved plate 6. A lower spherical slide plate 7 is arranged between the bottom curved surface of the curved plate 6 and the top concave surface of the lower plate 8. A longitudinal bridge limiting structure 10 is arranged on the lower plate 8 to limit the curved plate 6 on both sides in the longitudinal bridge direction.
[0022] The plane slide plate 2 is fixed as one with the top plane of the spherical crown lining plate 4, the upper spherical slide plate 5 is fixed as one with the top concave surface of the curved plate 6 and forms an upper spherical sliding pair with the bottom spherical surface of the spherical crown lining plate 4, and the lower spherical slide plate 7 is fixed as one with the bottom curved surface of the curved plate 6 and forms a lower spherical sliding pair with the top concave surface of the lower plate 8. A sealing ring 3 is also embedded around the plane slide plate 2 on the top plane of the spherical crown lining plate 4.
[0023] The material of the lower spherical slide plate 7 is different from that of the plane slide plate 2 and the upper spherical slide plate 5, and the friction coefficient between the lower spherical slide plate 7 and the lower plate 8 is greater than the friction coefficient between the plane slide plate 2 and the upper plate 1 and the friction coefficient between the upper spherical slide plate 5 and the bottom spherical surface of the spherical cap lining plate 4. The plane slide plate 2 and the upper spherical slide plate 5 are made of modified ultra-high molecular weight polyethylene or modified polytetrafluoroethylene and lubricated with silicone grease, and the lower spherical slide plate 7 is made of modified polytetrafluoroethylene but is not lubricated with silicone grease.
[0024] The upper and lower surfaces of the lower spherical slide plate 7 are both spherical surfaces, and the concave surface on the top of the lower plate 8 is a spherical surface that matches the lower surface of the lower spherical slide plate 7 .
[0025] Grooves are arranged on both sides of the top of the lower plate 8 in the longitudinal direction, and the longitudinal bridge limiting structures 10 are installed in the grooves to limit the curved plate 6 in the longitudinal direction.
Claims
1. A support with a seismic isolation device for a long-span continuous beam, characterized in that: From top to bottom, it includes an upper plate (1), a spherical crown lining plate (4), a curved plate (6) and a lower plate (8); a plane slide plate (2) is arranged between the bottom surface of the upper plate (1) and the top plane of the spherical crown lining plate (4); and a transverse bridge limiting structure (9) is arranged on the bottom surface of the upper plate (1) to limit the spherical crown lining plate (4) on both sides in the transverse bridge direction; an upper spherical slide plate (5) is arranged between the bottom spherical surface of the spherical crown lining plate (4) and the top concave surface of the curved plate (6); a lower spherical slide plate (7) is arranged between the bottom curved surface of the curved plate (6) and the top concave surface of the lower plate (8); and a longitudinal bridge limiting structure (10) is arranged on the lower plate (8) to limit the longitudinal bridge direction of the curved plate (6) on both sides; The upper and lower surfaces of the lower spherical slide plate (7) are both spherical surfaces, and the concave surface on the top of the lower plate (8) is a spherical surface that matches the lower surface of the lower spherical slide plate (7); The material of the lower spherical slide plate (7) is different from that of the plane slide plate (2) and the upper spherical slide plate (5), and the friction coefficient between the lower spherical slide plate (7) and the lower plate (8) is greater than the friction coefficient between the plane slide plate (2) and the upper plate (1) and the friction coefficient between the upper spherical slide plate (5) and the bottom spherical surface of the spherical cap lining plate (4); Under normal working conditions, the upper plate (1) and the spherical crown lining plate (4) slide in a longitudinal plane to adapt to the temperature displacement in the longitudinal direction of the bridge; when the beam body is displaced laterally or an earthquake occurs, the upper plate (1) drives the spherical crown lining plate (4) and the curved plate (6) to slide laterally together.
2. The support with a seismic isolation device for a long-span continuous beam according to claim 1, characterized in that: The plane slide plate (2) is fixed as one piece with the top plane of the spherical crown lining plate (4); the upper spherical slide plate (5) is fixed as one piece with the top concave surface of the curved plate (6) and forms an upper spherical sliding pair with the bottom spherical surface of the spherical crown lining plate (4); the lower spherical slide plate (7) is fixed as one piece with the bottom curved surface of the curved plate (6) and forms a lower spherical sliding pair with the top concave surface of the lower plate (8).
3. The support with a seismic isolation device for a long-span continuous beam according to claim 2, characterized in that: A sealing ring (3) is also embedded on the top plane of the spherical crown lining plate (4) around the flat slide plate (2).
4. The support with a seismic isolation device for a long-span continuous beam according to claim 1, characterized in that: The plane slide plate (2) and the upper spherical slide plate (5) are made of modified ultra-high molecular weight polyethylene or modified polytetrafluoroethylene and are lubricated with silicone grease, and the lower spherical slide plate (7) is made of modified polytetrafluoroethylene but is not lubricated with silicone grease.
5. The support with a seismic isolation device for a long-span continuous beam according to claim 1, characterized in that: Grooves are arranged on both sides of the top of the lower plate (8) in the longitudinal direction, and the longitudinal bridge limiting structure (10) is installed in the grooves to limit the curved plate (6) in the longitudinal direction.