CN211368329U - A combined seismic isolation system with multi-level seismic fortification function - Google Patents

Abstract

The utility model discloses a combined seismic mitigation and isolation system with multi-level seismic fortification function, which comprises a main beam, a capping beam or a pier, a stop block, a seismic mitigation and isolation support, a large anchor bolt, a damper and a pre-buried slotted hole; the shock absorption and isolation support is arranged at the top of the capping beam or the pier, the damper is arranged between the main beam and the capping beam along the longitudinal bridge direction, or the damper is arranged between the main beam and the pier along the longitudinal bridge direction, the pre-buried slotted hole is arranged at the bottom of the main beam, and a certain non-working length is reserved along the bridge direction and the transverse bridge direction for embedding a large anchor bolt; the lower part of the large anchor bolt is fixed on the bent cap or the pier, the upper part of the large anchor bolt is embedded into the pre-buried slotted hole of the main beam, and the stop blocks are arranged at two ends of the top of the bent cap or the pier. The utility model discloses under the protection of the multi-level function of seting up defences of this system, can improve the anti-seismic performance of the bridge construction as lifeline engineering, guarantee the unblocked of life line after shaking, improve the efficiency of rescuing and rescuing, the loss of lives and property that the secondary disaster that significantly reduces brought.

Description

A combined seismic isolation system with multi-level seismic fortification function

technical field

The utility model belongs to the technical field of bridge seismic isolation, in particular to a combined seismic isolation system capable of resisting the seismic effect of large-span concrete continuous girder bridges when different levels of ground motion are input, and is suitable for large-span concrete continuous girder bridges.

Background technique

my country is one of the most earthquake-prone countries in the world, and the form of earthquake resistance and disaster prevention is very severe. As an important part of lifeline engineering, the seismic performance of bridges has received extensive attention. Seismic isolation technology can reduce the seismic response of the main structure by extending the structural period and increasing the structural damping, and can achieve higher seismic fortification goals. At present, most of the commonly used seismic isolation technologies use single seismic measures such as seismic isolation bearings or dampers, which cannot meet the needs of different ground motion intensities, especially for super earthquakes exceeding E2 seismic action, lack of effective seismic resistance measure. Especially long-span concrete continuous girder bridges have large tonnage bearing capacity and displacement requirements, and it is impossible to solve their seismic problems simply by using isolation bearings or dampers.

Therefore, for long-span concrete continuous girder bridges, it is urgent to propose anti-seismic measures to meet the needs of different seismic intensities.

Utility model content

The purpose of this utility model is to overcome the above-mentioned deficiencies of the prior art, and to provide a combined seismic isolation system with multi-level seismic fortification functions, which can meet the requirements of small earthquakes, medium earthquakes, large earthquakes and strong earthquakes. Seismic requirements of long-span bridges under the action of different earthquake motions.

The technical scheme adopted by the utility model is: a combined seismic isolation system with multi-level seismic fortification function, comprising main beams, cover beams or bridge piers, blocks, seismic isolation bearings, large anchor bolts, dampers and pre- Buried slot hole;

The shock-absorbing support is arranged on the top of the cover beam or the bridge pier, and mainly bears the vertical load and the horizontal load, and transmits the supporting reaction force of the upper structure; the damper is arranged between the main beam and the cover beam along the longitudinal bridge direction. , or the damper is arranged between the main girder and the bridge pier along the longitudinal bridge direction, mainly dissipating the seismic action along the bridge direction; the pre-embedded slot holes are arranged at the bottom of the main beam, and a certain amount of space is reserved in the longitudinal and transverse bridge directions. The non-working length is used for the embedding of large anchor bolts; the lower part of the large anchor bolt is fixed on the cover beam or bridge pier, and the upper part is embedded in the pre-embedded slot hole of the main beam, which mainly bears the horizontal seismic action; the block is arranged on the cover beam or bridge pier. The two ends of the top of the beam or pier are used to realize the lateral limit of the transverse bridge.

The working principle of the utility model: when the E1 level earthquake acts, the seismic isolation bearing is used to resist the earthquake action; when the E2 level earthquake acts, the anti-seismic bearing, the large anchor bolt and the stop block jointly resist the transverse bridge earthquake, and the anti-seismic bearing is used to resist the earthquake. , dampers jointly resist the longitudinal bridge earthquake; when the super earthquake exceeds the E2 level earthquake, the anti-seismic bearing, large anchor bolts and blocks jointly resist the transverse bridge earthquake, and the anti-seismic bearing, damper and large anchor bolt Jointly resist longitudinal bridge earthquakes.

Preferably, the shock-absorbing and isolating bearings can be selected from different types of bearings according to the actual seismic requirements of the bridge structure, including lead-core rubber bearings, natural rubber bearings, high-damping rubber bearings, friction pendulum bearings and other shock-absorbing bearings. Vibration isolation support.

Preferably, the dampers can be selected from viscous dampers or steel dampers, and the number of dampers and the specific parameters of the dampers can be determined according to the specific seismic requirements of the bridge structure.

Preferably, the material of the large anchor bolts can be selected from steel, the diameter of the anchor bolts is determined by calculation according to the earthquake resistance requirements, and one or more bolts can also be selected and arranged as required.

Preferably, the stopper can be a concrete stopper or a steel stopper. When there is a cover beam, it is arranged at both ends of the top of the cover beam, and when there is no cover beam, it can be arranged in the middle of the top of the bridge pier. Location.

Beneficial effects: under the protection of the multi-level fortification function of the system, the present utility model can improve the seismic performance of the bridge structure as a lifeline project, ensure the smooth flow of the lifeline after the earthquake, improve the efficiency of emergency rescue and disaster relief, and greatly reduce the damage caused by secondary disasters. loss of life and property.

Description of drawings

Fig. 1 is the layout along the bridge of the combined shock isolation system provided by the utility model;

Fig. 2 is the transverse bridge arrangement diagram of the large combined shock isolation system provided by the utility model;

FIG. 3 is a plan view of the combined shock isolation system provided by the utility model.

In the picture: 1-main beam, 2-cover beam, 3-block, 4-shock isolation bearing, 5-large anchor bolt, 6-viscous damper, 7-pre-embedded slot.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

Example 1:

As shown in Figures 1-3, this embodiment introduces the embodiment in which the blocks are placed at both ends of the cover beam in the combined seismic isolation system (covered beam), including the main beam 1, the cover beam 2, the stop block 3, the reducing Seismic isolation support 4, large anchor bolt 5, viscous damper 6, pre-embedded slot 7. The shock isolation bearing 4 is arranged on the top of the cover beam 2, mainly bears vertical load and horizontal load, and transmits the supporting reaction force of the upper structure; the viscous damper 6 is arranged on the main beam 1 and the main beam along the longitudinal bridge direction. Between the cover beams 2, the seismic action along the bridge direction is mainly dissipated; the lower part of the large anchor bolt 5 is fixed on the cover beam 2, and the upper part is embedded in the embedded slot hole 7 of the main beam 1, which mainly bears the horizontal earthquake action; The blocks 3 are arranged at both ends of the top of the cover beam 2, and its function is to realize the limit in the transverse bridge direction; the pre-embedded slot holes 7 are arranged at the bottom of the main beam 1, and a certain amount is reserved in the longitudinal and transverse directions. Non-working length, for large anchor bolts 5 to be embedded.

The shock-absorbing and isolating bearings 4 can be selected from different types of bearings according to the actual seismic requirements of the bridge structure, including lead-core rubber bearings, natural rubber bearings, high-damping rubber bearings, friction pendulum bearings and other shock-absorbing and isolating bearings. support. The material of the large anchor bolt 5 can be selected from steel, and the diameter of the anchor bolt is determined by calculation according to the seismic requirements, and one or more of the anchor bolts can also be selected and arranged as required. The stopper 3 can be a concrete stopper or a steel stopper. When there is a cover beam, it is arranged at both ends of the top of the cover beam, and when there is no cover beam, it can be arranged at the middle position of the top of the bridge pier.

The working principle of the present invention is as follows: when the E1 level earthquake acts, the seismic isolation bearing 4 is used to resist the earthquake action; the transverse bridge direction earthquake when the E2 level earthquake acts is caused by the seismic isolation bearing 3, the large anchor bolt 5, the block 3 Common resistance, the longitudinal bridge earthquake is jointly resisted by the isolation bearing 4 and the viscous damper 6; when the super earthquake exceeds the E2 level earthquake, the transverse bridge earthquake is resisted by the isolation bearing 4 and the large anchor bolt 5. , Blocks 3 are jointly resisted, and longitudinal bridge earthquakes are jointly resisted by shock-absorbing and isolating bearings 4 , viscous dampers 6 and large anchor bolts 5 . When the system is subjected to different levels (intensity) of ground motion, the damping of the structure is greatly increased, the acceleration response and displacement response of the main beam are reduced, and the internal force of the pier bottom of the fixed pier is greatly reduced, which is beneficial to the overall coordinated force of the continuous girder bridge.

Example 2:

This example introduces the embodiment in which the block is placed in the middle of the top of the bridge pier in the combined shock isolation system (beam without cover), including the main beam, the bridge pier, the block, the shock isolation bearing, the large anchor bolt, and the viscous damper , Pre-embedded slot holes. The shock-absorbing and isolating bearings are arranged on the top of the bridge pier, mainly bear the vertical load and the horizontal load, and transmit the supporting reaction force of the upper structure; the viscous damper is arranged between the main girder and the bridge pier along the longitudinal bridge direction, mainly Dissipate the seismic action along the bridge; the lower part of the large anchor bolt is fixed on the bridge pier, and the upper part is embedded in the pre-embedded slot hole of the main girder, which mainly bears the horizontal earthquake action; the block is arranged in the middle of the top of the bridge pier, and its function In order to realize the limit in the transverse bridge direction; the pre-embedded slot holes are arranged at the bottom of the main girder, and a certain non-working length is reserved in the transverse bridge direction and the transverse bridge direction for the displacement of the anchor bolts.

The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, within the scope of the principles and technical ideas of the present invention, various changes, modifications, substitutions and deformations to these embodiments still fall within the protection scope of the present invention.

Claims (5)

1. a combined shock isolation system with multi-level seismic fortification function, it is characterized in that: comprise main beam, cover beam or bridge pier, block, shock isolation bearing, large anchor bolt, damper and embedded slot hole ; The shock isolation bearing is arranged on the top of the cover beam or the bridge pier, and the damper is arranged between the main beam and the cover beam along the longitudinal bridge direction, or the damper is arranged between the main beam and the bridge pier along the longitudinal bridge direction. The pre-embedded slot holes are arranged at the bottom of the main girder, and the non-working length for the embedding of large anchor bolts is reserved in the bridge direction and the transverse bridge direction. The lower part of the large anchor bolt is fixed on the cover beam or bridge pier, and the upper part is embedded in the main beam. In the pre-embedded slot hole, the stopper is arranged at both ends of the top of the cover beam or the bridge pier. 2. A combined shock isolation system with multi-level seismic fortification function according to claim 1, characterized in that: the shock isolation support is a lead core rubber support, a natural rubber support, a high damping rubber bearing or friction pendulum bearing. 3 . The combined shock absorption and isolation system with multi-level seismic fortification function according to claim 1 , wherein the damper is a viscous damper or a steel damper. 4 . 4 . The combined seismic isolation system with multi-level seismic fortification function according to claim 1 , wherein the material of the large anchor bolt is selected from steel. 5 . 5. A combined seismic isolation system with multi-level seismic fortification function according to claim 1, characterized in that: the block is a concrete block or a steel block, and when there is a cover beam, it is arranged on the cover The two ends of the top of the beam, when there is no cover beam, are arranged in the middle of the top of the bridge pier.

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