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Pre-pressing limiting seismic mitigation and absorption method and device for bridge

A vibration reduction and isolation and preloading technology, which is applied in the field of bridge vibration reduction, can solve problems such as limited service life, bridge pier damage, and poor economy, and achieve the effects of low manufacturing, use and maintenance costs, reduced earthquake response, and reliable and durable structures

Inactive Publication Date: 2020-08-07
CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of seismic isolation measures can effectively reduce the seismic response of the structure, but the cost is high. For small and medium-sized bridges with large quantities and wide areas, the economy is poor
Moreover, the existing shock-absorbing and isolating devices use a large number of rubber products, and their service life in the field is also limited, which will inevitably increase maintenance and management costs
The use of ductile anti-seismic design will cause some bridge piers to be damaged under the action of the earthquake. The damaged bridge cannot reset itself after the earthquake, which will affect the passage of rescue vehicles after the earthquake, and it is difficult to repair after the earthquake.

Method used

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  • Pre-pressing limiting seismic mitigation and absorption method and device for bridge
  • Pre-pressing limiting seismic mitigation and absorption method and device for bridge
  • Pre-pressing limiting seismic mitigation and absorption method and device for bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] see Figure 1 ~ Figure 2 , is a preload limit shock absorbing device for a bridge, including a preload limit unit, the preload limit unit includes a preload spring 1 and a preload box 2 for compressing the preload spring, and the preload limit unit It is arranged between the bridge pier 3 and the main girder 4 , and the compression direction of the preload spring 1 is perpendicular to the extension direction of the bridge pier 3 . In this embodiment, the preload spring 1 is a metal coil spring.

[0031] The pre-compression box 2 is fixedly arranged on the pier 3, and the side of the pier 3 close to the main girder 4 is the top surface. For a continuous girder bridge, there is only one main girder 4. When the space is installed, the preloaded spacer unit can be installed between the top surface of the bridge pier 3 and the main girder 4 .

[0032] The pre-compression box 2 is fixedly arranged on the top surface of the bridge pier 3 . The pre-compression spring 1 is co...

Embodiment 2

[0036] see Figure 3 ~ Figure 4 , the surface around the top surface of the pier 3 is the side. When the installation space between the top surface of the pier 3 and the main girder 4 is small, the pre-compression limit unit can be installed between the side of the pier 3 and the main girder 4. In this embodiment, there are two pre-compression limiting units, and the two pre-compression boxes 2 are respectively arranged on the two corresponding sides of the bridge pier 3 . The two preload springs 1 respectively act on the two limit blocks 6 on the main beam 4 through the two connecting rods 5 .

Embodiment 3

[0038] see Figure 5 ~ Figure 7, for a simply supported bridge, there are two main girders 4 . There are two preloading limit units, and the end of the connecting rod 5 close to the preloading spring 1 is provided with a forward limit 7 and a reset limit 8, and the forward limit 7 and the reset limit 8 are arranged along the extension direction of the connecting rod 5 , The preload spring 1 is arranged between the forward limit 7 and the return limit 8, and the connecting rod 5 performs reciprocating compression on the preload spring 1 through the forward limit 7 and the return limit 8. The pre-compression box 2 is provided with a through hole for the connecting rod 5 to pass through. The other end of the connecting rod 5 is connected to the main beam 4 , and the two preloaded position-limiting units are respectively connected to the two main beams 4 through the connecting rod 5 .

[0039] During the earthquake, when the main girder 4 moves toward the bridge pier 3, the prel...

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Abstract

The invention relates to a pre-pressing limiting seismic mitigation and absorption method and device for a bridge, and belongs to the technical field of bridge seismic mitigation. The pre-pressing limiting seismic mitigation and absorption method comprises the following steps that a pre-pressing spring is arranged between a pier and a main beam, the main beam acts on the pier in the compression direction of the pre-pressing spring through the pre-pressing spring, and the pre-pressing force of the pre-pressing spring is larger than or equal to 1.5 times of the friction force between the pier and the main beam. The pre-pressing limiting shock absorption and isolation device comprises a pre-pressing limiting unit, the pre-pressing limiting unit comprises a pre-pressing spring and a pre-pressing box used for compressing the pre-pressing spring, and a connecting rod is arranged between the pre-pressing spring and the main beam. When an earthquake is weak, the main beam and the bridge pier can be limited, the structural rigidity between the main beam and the bridge pier is kept, and a bridge structure is in a normal use state; when the earthquake intensity is large, the horizontal rigidity between the main beam and the bridge pier can be reduced, the earthquake response of the bridge is reduced, the position between the main beam and the bridge pier is automatically reset after the earthquake is finished, and normal use of the bridge is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of bridge shock absorption, and relates to a method and device for preloading and limiting shock absorption and isolation of bridges. Background technique [0002] In actual production and life, a large number of small and medium-span bridges pass through high-intensity earthquake areas. In order to ensure the safety of bridges in the event of earthquake disasters, one way is to adopt shock-absorbing and isolation measures, that is, to install shock-absorbing and isolating bearings, various damping and energy-consuming devices, etc.; The energy dissipation capacity and ductility capacity of the bridge are improved, and anti-seismic measures such as installation of anti-drop beam devices, lengthening of the lap length of the main girder and the bridge pier, etc. are added. The use of seismic isolation measures can effectively reduce the seismic response of structures, but the cost is high, and the economy is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/00E01D21/00
CPCE01D19/00E01D21/00
Inventor 郑万山唐光武刘怀林高文军谢皓宇
Owner CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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