A multi-stage cooperative seismic system based on tunnel-bridge integration

Abstract

The application relates to a multi-stage cooperative anti-seismic system based on tunnel-bridge integration, and belongs to the technical field of civil engineering anti-seismic technology. The multi-stage cooperative anti-seismic system comprises a tunnel, a bridge and an abutment, further comprises a multi-stage connecting device and a shock absorption and isolation device, one end of the bridge is placed on the abutment through the shock absorption and isolation device, the shock absorption and isolation device provides energy dissipation and self-resetting functions; the tunnel and the bridge are connected into a whole through the multi-stage connecting device, the multi-stage connecting device can control the relative dislocation of the tunnel and the bridge, simultaneously generates damping through deformation and realizes energy dissipation capacity; wherein the abutment is arranged at the outer end of the tunnel, a joint is arranged between the abutment and the outer end of the bridge, and the two ends of the multi-stage connecting device are arranged on the abutment and the bridge on the two sides of the joint. The application can effectively reduce the damage of the bridge-tunnel and railway structure under the action of earthquakes.

Description

Technical Field

[0001] This invention relates to a multi-stage collaborative seismic resistance system based on tunnel-bridge integration, belonging to the field of seismic resistance technology in civil engineering. Background Technology

[0002] Because some railways, such as the Sichuan-Tibet Railway, pass through earthquake zones or seismic belts and have complex terrain, tunnels and bridges may be directly connected. The stiffness of tunnels is much higher than that of the connected bridge structures. Under earthquake action, this sudden change in stiffness causes the deformation and displacement responses of tunnels and bridges to be uncoordinated, leading to aggravated earthquake damage to bridge, tunnel, and railway structures and seriously affecting their post-earthquake usability. Summary of the Invention

[0003] To address the aforementioned deficiencies in existing technologies, this invention proposes a multi-stage collaborative seismic resistance system based on tunnel-bridge integration, which can effectively reduce damage to bridge, tunnel, and railway structures under seismic loads.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A multi-stage collaborative seismic resistance system based on tunnel-bridge integration includes a tunnel, a bridge, and bridge abutments. The multi-stage collaborative seismic resistance system also includes a multi-level connection device and a seismic isolation device. One end of the bridge is placed on the bridge abutment through the seismic isolation device, which provides energy dissipation and self-resetting functions. The tunnel and bridge are connected as a whole through the multi-level connection device, which can control the relative displacement between the tunnel and the bridge, and generate damping through deformation to achieve energy dissipation. The bridge abutment is located at the outer end of the tunnel, and a joint is provided between the bridge abutment and the outer end of the bridge. The two ends of the multi-level connection device are respectively located on the bridge abutment and the bridge on both sides of the joint.

[0006] Furthermore, the vibration damping and isolation device is a reset energy-dissipating vibration isolation bearing.

[0007] Furthermore, the reset energy-dissipating vibration isolation bearing is a lead-core rubber vibration isolation bearing or a friction pendulum vibration isolation bearing.

[0008] Furthermore, railway tracks are laid inside the tunnel and on the bridge.

[0009] Furthermore, the multi-level connection device is a polygonal deformation system, and is at least one set arranged on both sides of the bridge abutment and the bridge. Each set includes a middle connection energy dissipation device and hinged fixing devices at both ends. The hinged fixing devices at both ends extend out and are vertically fixed to the outer wall of the bridge abutment and the bridge, respectively.

[0010] Furthermore, the bridge includes piers, cap beams, and abutments, with a sway interface provided between the piers, cap beams, and abutments, or with a vibration damping and isolation device provided between the piers and cap beams.

[0011] Furthermore, for bridge piers with a swaying interface, it also includes prestressing tendons and energy dissipation devices; the prestressing tendons vertically penetrate the pier and are anchored at both ends in the cap beam and the abutment respectively; the energy dissipation devices are located on the left and right sides of the upper and lower ends of the pier.

[0012] Furthermore, the energy-consuming device consists of two cross-shaped energy-consuming rods, with the fixed end of each energy-consuming rod installed on the bridge pier, cap beam, or pier cap.

[0013] Furthermore, the energy dissipation device is composed of a metal yielding damper.

[0014] The principle is as follows:

[0015] During normal operation, the multi-stage connection device connects the tunnel and the bridge together. There is almost no relative displacement between the bridge and the tunnel. The two work together to bear the force and can be regarded as a whole. The piers, cap beams and abutments are in close contact to ensure the stability of train operation.

[0016] Under the action of small to medium earthquakes, the connection force provided by the multi-stage connection device is insufficient to meet the resistance required for the consolidation of the bridge and tunnel, causing relative displacement between the tunnel and the bridge, and the connection between the two changes from rigid to semi-connection. At the same time, the multi-stage connection device and the joints dissipate some of the seismic energy due to deformation and friction, reducing the structural displacement response. In addition, gaps are generated at the connection between the piers and the abutments and cap beams, which are "lifted away" under the action of earthquakes and "closed" under the action of prestressing tendons. Meanwhile, the energy dissipation device dissipates the energy brought by the earthquake, prevents other parts of the bridge from being damaged, and reduces the residual displacement of the bridge.

[0017] Under the action of a major earthquake, the relative displacement between the tunnel and the bridge further increases, the multi-level connection device fails, the bridge and the tunnel are completely separated, and each resists the seismic action; at the same time, the seismic isolation and energy dissipation devices play the functions of seismic isolation and energy dissipation.

[0018] After the earthquake, the seismic isolation devices, multi-stage connection devices, and prestressed tendons achieve self-resetting function, restoring the bridge to its original position and reducing residual deformation after the earthquake.

[0019] This invention utilizes multi-stage connection devices and seismic isolation devices to transform the bridge-tunnel connection method. This allows for the full utilization of the tunnel's stiffness advantage during normal operation, reducing relative bridge-tunnel displacement and maintaining train stability. Simultaneously, it enables phased seismic resistance of the tunnel-bridge integrated structural system under earthquakes of varying intensities. This system achieves bridge-tunnel connection, fusing, and seismic isolation functions, effectively improving the seismic performance of railways. Specific beneficial effects are as follows:

[0020] 1. During normal operation, the bridge and tunnel are rigidly connected, and the relative displacement of the bridge is small, ensuring the smooth operation of trains.

[0021] 2. Under seismic loading, it has good energy dissipation performance and small residual displacement, and strong vibration reduction and isolation capabilities.

[0022] 3. Under the action of a major earthquake, the tunnel and the bridge remain independent, which reduces the earthquake damage caused by the deformation incoordination of the tunnel-bridge connection system and ensures the overall consistency of the bridge's seismic performance.

[0023] 4. It has a good self-resetting function, ensuring the system's post-earthquake usability and recoverability, and the device is easy to maintain and replace.

[0024] 5. The tunnel-bridge system can achieve multi-stage seismic resistance under earthquakes of different intensities, minimizing railway earthquake damage and improving the seismic performance of the Sichuan-Tibet Railway. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the multi-stage collaborative seismic resistance system based on tunnel-bridge integration of the present invention.

[0026] Figure 2 This is a schematic cross-sectional view of the connecting section of the multi-stage collaborative seismic resistance system based on tunnel-bridge integration according to the present invention;

[0027] Figure 3 This is a top view of the connecting section during normal operation of the present invention;

[0028] Figure 4 This is a top view of the connecting section under seismic action according to the present invention;

[0029] Figure 5 A schematic diagram of a bridge pier equipped with an energy-consuming device for this invention. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0031] Example 1

[0032] like Figure 1-4As shown, this embodiment of a multi-stage collaborative seismic resistance system based on tunnel-bridge integration includes a tunnel 01, a bridge 02, and an abutment 06. Rails are laid inside the tunnel 01 and on the bridge 02. The multi-stage collaborative seismic resistance system also includes a multi-level connecting device 03 and a seismic isolation device 05. One end of the bridge 02 is placed on the abutment 06 via the seismic isolation device 05. The seismic isolation device 05 provides energy dissipation and self-resetting functions. In this embodiment, the seismic isolation device 05 is a reset energy-dissipating seismic isolation bearing, specifically a lead-core rubber seismic isolation bearing. The tunnel 01 and bridge 02 are connected as a whole by the multi-level connecting device 03. The multi-level connecting device 03 can control the relative misalignment between the tunnel 01 and bridge 02, and simultaneously generate damping through deformation to achieve energy dissipation. The abutment 06 is located at the outer end of the tunnel 01, and a joint 04 is provided between the abutment 06 and the outer end of the bridge 02. The two ends of the multi-level connecting device 03 are respectively located on the abutment 06 and the bridge 02 on both sides of the joint 04. Figure 2-4 As shown, the multi-level connection device 03 is a polygonal deformation system and is a set installed on both sides of the bridge abutment 06 and the bridge 02. It includes a middle connection energy dissipation device and hinged fixing devices at both ends. The hinged fixing devices at both ends extend out and are vertically fixed on the outer walls of the bridge abutment 06 and the bridge 02, respectively.

[0033] like Figure 5 As shown, bridge 02 includes piers 021, cap beams 025, and abutments 026. A sway interface 023 is provided between piers 021, cap beams 025, and abutments 026, or as shown... Figure 1 As shown, a vibration damping and isolation device 05 is installed between pier 021 and cap beam 025.

[0034] like Figure 5 As shown, for the bridge pier 021 of bridge 02 with a sway interface 023, it also includes prestressing tendons 024 and energy dissipation devices 027. The prestressing tendons 024 vertically penetrate the pier 021, and both ends are anchored in the cap beam 025 and the abutment 026, respectively. The energy dissipation devices 027 are located on the left and right sides of the upper and lower ends of the pier 021. The energy dissipation device 027 consists of two cross-shaped energy dissipation bars, with the fixed end of each bar located on the pier 021, cap beam 025, or abutment 026. In this embodiment, the energy dissipation device 027 is composed of a metal yielding damper.

[0035] Its operating principle is as follows:

[0036] During normal operation, the multi-stage connection device 03 connects the tunnel 01 and the bridge 02 together. There is almost no relative displacement between the bridge and the tunnel. The two work together to bear the force and can be regarded as a whole. Furthermore, the bridge pier 021, the cap beam 025, and the abutment 026 are in close contact, ensuring the stability of the train.

[0037] Under the action of small to medium earthquakes, the connecting force provided by the multi-stage connection device 03 is insufficient to meet the resistance required for the consolidation of the bridge and tunnel, causing relative misalignment between tunnel 01 and bridge 02, transforming their rigid connection into a semi-connection. Simultaneously, the multi-stage connection device 03 and joint 04 dissipate some seismic energy due to deformation and friction, reducing the structural displacement response. Furthermore, gaps appear at the connections between pier 021 and abutment 026 and cap beam 025, which are "lifted away" under seismic action and "closed" under the action of prestressed tendons 024. At the same time, the energy dissipation device 027 dissipates the energy brought by the earthquake, preventing damage to other parts of bridge 02 and reducing the residual displacement of the bridge.

[0038] Under the influence of a major earthquake, the relative displacement between tunnel 01 and bridge 02 further increases, the multi-stage connection device 03 fails, and tunnel 01 and bridge 02 are completely disconnected, each resisting the seismic force. At the same time, the seismic isolation device 05 and the energy dissipation device 027 perform their functions of seismic isolation and energy dissipation.

[0039] After the earthquake, the seismic isolation device 05, the multi-stage connection device 03, and the prestressed tendon 024 achieve self-resetting function, restoring the bridge 02 to its original position and reducing post-earthquake residual deformation.

[0040] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the structure of the present invention. The arrangement and quantity of the present invention are not limited to this example and can be optimized according to actual engineering conditions. Any modifications, equivalent changes, and decorations made to the above embodiments based on the technical principles of the present invention, without departing from the scope of the present invention, are still within the scope of the present invention.

Claims

1. A multi-stage collaborative seismic resistance system based on tunnel-bridge integration, comprising a tunnel (01), a bridge (02) and an abutment (06), characterized in that: The multi-stage collaborative seismic resistance system also includes a multi-level connection device (03) and a seismic isolation device (05). One end of the bridge (02) is placed on the abutment (06) through the seismic isolation device (05), which provides energy dissipation and self-resetting function. The tunnel (01) and the bridge (02) are connected into a whole through the multi-level connection device (03). The multi-level connection device (03) can control the relative displacement between the tunnel (01) and the bridge (02), and at the same time generate damping through deformation and realize energy dissipation capacity. The abutment (06) is set at the outer end of the tunnel (01), and a joint (04) is set between the abutment (06) and the outer end of the bridge (02). The two ends of the multi-level connection device (03) are respectively set on the abutment (06) and the bridge (02) on both sides of the joint (04). The bridge (02) includes piers (021), cap beams (025) and abutments (026). A sway interface (023) is provided between the piers (021) and the cap beams (025) and the abutments (026), or a vibration damping and isolation device (05) is provided between the piers (021) and the cap beams (025). For a bridge pier (021) of a bridge (02) with a swing interface (023), it also includes prestressed tendons (024) and energy dissipation devices (027); the prestressed tendons (024) penetrate vertically through the pier (021) and are anchored at both ends in the cap beam (025) and the abutment (026) respectively; the energy dissipation devices (027) are located on the left and right sides of the upper and lower ends of the pier (021); The energy dissipation device (027) consists of two cross-shaped energy dissipation bars, with the fixed end of each energy dissipation bar set on the pier (021), cap beam (025), or pier cap (026). The energy dissipation device (027) is composed of a metal yielding damper; During normal operation, the multi-level connection device (03) connects the tunnel (01) and the bridge (02) together. There is almost no relative displacement between the bridge and the tunnel. The two work together to bear the force and can be regarded as a whole. The piers (021), the cap beams (025) and the abutments (026) are in close contact to ensure the stability of the train. Under the action of small and medium earthquakes, the connection force provided by the multi-level connection device (03) is insufficient to meet the resistance required for the consolidation of the bridge and tunnel, causing relative displacement between the tunnel (01) and the bridge (02), and the two are changed from rigid connection to semi-connection; at the same time, the multi-level connection device (03) and the joint (04) dissipate some of the seismic energy due to deformation and friction, reducing the structural displacement response; in addition, gaps are generated at the connection between the pier (021) and the abutment (026) and the cap beam (025), which are "lifted away" under the action of earthquake and "closed" under the action of prestressed tendons (024); at the same time, the energy dissipation device (027) dissipates the energy brought by the earthquake, prevents other parts of the bridge (02) from being damaged, and reduces the residual displacement of the bridge; Under the action of a major earthquake, the relative displacement between the tunnel (01) and the bridge (02) further increases, the multi-level connection device (03) fails, the tunnel (01) and the bridge (02) are completely disconnected, and each resists the earthquake action; at the same time, the seismic isolation device (05) and the energy dissipation device (027) play the functions of seismic isolation and seismic energy dissipation. After the earthquake, the seismic isolation device (05), the multi-stage connection device (03), and the prestressed tendons (024) achieve self-resetting function, restoring the bridge (02) to its original position and reducing post-earthquake residual deformation; The multi-level connection device (03) is a polygonal deformation system and is provided on both sides of the abutment (06) and the bridge (02). Each group includes a middle connection energy dissipation device and hinged fixing devices at both ends. The hinged fixing devices at both ends extend out and are vertically fixed on the outer walls of the abutment (06) and the bridge (02).

2. The multi-stage cooperative seismic resistance system based on tunnel-bridge integration according to claim 1, characterized in that: The vibration damping and isolation device (05) is a reset energy-dissipating vibration isolation bearing.

3. The multi-stage cooperative seismic resistance system based on tunnel-bridge integration according to claim 2, characterized in that: The reset energy-dissipating seismic isolation bearing is a lead-core rubber seismic isolation bearing or a friction pendulum seismic isolation bearing.

4. The multi-stage collaborative seismic resistance system based on tunnel-bridge integration as described in claim 1, characterized in that: The tunnel (01) and the bridge (02) are equipped with railway tracks.

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