CN103046662A - Soft contact limit mechanism for isolation layers - Google Patents

Abstract

A soft contact limit mechanism for a shock-isolation layer, which belongs to the technical field of shock absorption and shock isolation for engineering structures, and includes a limiter, a buffer and a reaction force support. Both the limiter and the buffer are elastic devices, and the limiter The stiffness of the stopper is greater than that of the buffer; one end of the stopper is fixed on the reaction support, the other end of the stopper is fixedly connected to one end of the buffer, and the other end of the stopper is connected to the upper floor of the shock-isolation floor. There is a reserved distance between them; the reaction support is connected with the lower part of the shock-isolation layer. When the earthquake causes a large lateral displacement of the isolation floor, the upper floor of the isolation floor collides with the buffer, causing the buffer and the limiter to deform. Since the buffer itself has a small The seismic layer brings a large impact, which avoids the damage to the building structure caused by the impact; at the same time, due to the large deformation and deformation stiffness of the stopper, it not only allows a certain amount of lateral displacement of the seismic isolation layer, but also prevents the It is controlled within a safe range.

Description

A soft contact limit mechanism for shock-isolation layer

technical field

The invention relates to a shock-isolation layer soft-contact limit mechanism, which belongs to the field of engineering structure shock absorption and shock isolation technology, and is mainly used for the protection of foundation shock-isolation devices of buildings such as houses and bridges.

Background technique

There are two most commonly used forms of foundation isolation structure, one is rubber bearing isolation structure, and the other is sliding isolation structure. Due to its excellent performance in earthquakes, it is more and more widely used. When investigating the earthquake-isolated buildings after the earthquake, it was found that the earthquake-isolation layer collided with the foundation. Due to the irregularity of the seismic wave, the low-frequency part of the earthquake wave has the possibility of resonating with the structure, so that the earthquake-isolation layer The displacement exceeds the original design value, causing damage to the seismic isolation layer and related pipelines.

In order to prevent the displacement of the isolation layer from exceeding the design value, a limit device is often used to limit the displacement of the isolation layer. There are three commonly used limit devices, the first is to directly set the limit baffle, and the second is to use springs, U-shaped steel plates and the like are used as stoppers, and the third is to use rubber as stoppers. The first two limit measures, due to the high contact stiffness during the collision, will bring impact to the shock-isolation layer, and when the impact is large, it will cause structural damage; the third measure, because the rubber layer When the rubber layer is thick, the deformation is large and cannot play a limiting effect. When the rubber layer is thin, after the rubber layer is compressed, it will still bring impact to the upper structure.

Contents of the invention

In order to solve the negative impact of the existing limiting device, the present invention proposes a soft contact limiting mechanism for the shock-isolation layer with relatively small contact stiffness and relatively large deformation stiffness, which will not impact the shock-isolation layer during contact, and can Play a good limit effect.

Technical scheme of the present invention is as follows:

A shock-isolation layer soft contact limit mechanism, including a limiter, a buffer and a reaction force support, the limiter and the buffer are elastic devices, and the stiffness of the limiter is greater than the stiffness of the buffer; wherein, One end of the limiter is fixed on the reaction force support, the other end of the limiter is fixedly connected with one end of the buffer, and there is a reserved distance between the other end of the buffer and the upper floor of the shock-isolation floor; the reaction force The support is connected with the lower part of the shock-isolation layer.

The limiter is a spring or a U-shaped steel plate. Its stiffness is relatively large, and the specific stiffness is determined by calculation.

The buffer is a spring or a rubber block. Its stiffness is small, and the specific stiffness is determined by calculation.

When the earthquake causes a large lateral movement of the isolation floor, the upper floor of the isolation floor collides with the buffer, causing deformation of the buffer and the limiter. When the floor is in contact, the contact stiffness is also small, which will not give a large reaction force to the seismic isolation layer, and avoid the damage to the building structure caused by the impact; at the same time, due to the large deformation and deformation stiffness of the stopper, it allows The shock-isolation layer has a certain amount of lateral movement, and it will be controlled within a safe range to exert the shock-isolation effect.

The above-mentioned soft contact limit mechanism of the shock-isolation layer can be applied not only to the shock-isolation structure of the rubber bearing foundation, but also to the shock-isolation structure of the foundation sliding.

Beneficial effect:

The shock-isolation layer soft contact limiting mechanism adopted in the present invention will not produce impact on the shock-isolation layer when in contact, but also has a good position-limiting effect, and has low cost and convenient construction.

Description of drawings

Fig. 1 is the schematic diagram of the soft contact limit mechanism of the shock-isolation layer of the present invention;

Fig. 2 is the elevation schematic diagram that the present invention uses in the rubber bearing shock-isolation system;

Fig. 3 is the mechanism schematic diagram that adopts spring stopper rubber block buffer of the present invention;

Fig. 4 is the mechanism schematic diagram of adopting U-shaped steel plate limiter rubber block buffer of the present invention;

In the figure: 1-limiter; 2-bumper; 3-reaction support; 4-upper floor of the isolation floor; 5-rubber bearing; 6-superstructure of the isolation system.

Detailed ways

As shown in Figures 1-4, the specific implementation of the shock-isolation layer soft contact limit mechanism of the present invention is as follows:

Example 1:

As shown in Figure 1-2, a shock-isolation layer soft contact limit mechanism of the present invention includes a limiter 1, a buffer 2 and a reaction force support 3, and both the limiter 1 and the buffer 2 are elastic devices , the stiffness of the limiter 1 is greater than that of the buffer 2; wherein, one end of the limiter 1 is fixed on the reaction support 3, the other end of the limiter 1 is fixedly connected with one end of the buffer 2, and the buffer 2 There is a reserved distance between the other end and the upper floor 4 of the shock-isolation layer; the reaction support 3 is connected with the lower part of the shock-isolation layer. Wherein, the limiter 1 adopts a spring, and its rigidity is relatively large; the buffer 2 also adopts a spring, and its rigidity is relatively small. The shock-isolation layer adopts a rubber bearing 5 for shock isolation, and the rubber bearing 5 is provided with an upper floor 4 of the earthquake-isolation layer, and the upper part of the upper floor 4 of the earthquake-isolation layer is the upper structure 6 of the earthquake-isolation system.

When the side shift of the seismic isolation layer is greater than the reserved distance, the upper floor 4 of the seismic isolation layer collides with the buffer 2. Since the contact stiffness of the buffer 2 is small, the contact will not bring a greater impact to the building structure. When the buffer 2 deforms, it drives the limiter 1 to deform, and the two together provide a reaction force to the shock-isolation layer, limit the lateral movement of the shock-isolation layer, and protect the shock-isolation layer and its auxiliary facilities.

Example 2:

As shown in Fig. 3, in the shock-isolation layer soft contact limit mechanism of the present invention, the limiter 1 adopts a spring, and the buffer 2 adopts a rubber block. Other structures and principles are the same as those in Embodiment 1, and will not be detailed here. the

Example 3:

As shown in Figure 4, in the shock-isolation layer soft contact limit mechanism of the present invention, the limiter 1 adopts a U-shaped steel plate, and the buffer 2 adopts a rubber block. Other structures and principles are the same as those in Embodiment 1, and will not be described in detail here. .

Wherein, the rubber bearing 5 in the base isolation structure of the rubber bearing of the above embodiment can also be replaced by a base sliding bearing, and used for position limitation in the base sliding base isolation structure.

The above are only three specific embodiments of the present invention, and the implementation of the present invention is not limited thereto.

Claims (3)

1. A shock-isolation layer soft contact limit mechanism, including a limiter (1), a buffer (2) and a reaction support (3), characterized in that: the limiter (1) and the buffer (2) are all elastic devices, and the stiffness of the limiter (1) is greater than that of the buffer (2); wherein, one end of the limiter (1) is fixed on the reaction support (3), and the limiter ( The other end of 1) is fixedly connected with one end of the buffer (2), and there is a reserved distance between the other end of the buffer (2) and the upper floor (4) of the seismic isolation floor; the reaction support (3) Connect with the lower part of the isolation layer. 2. A shock-isolation layer soft contact limit mechanism according to claim 1, characterized in that: said limiter (1) is a spring or a U-shaped steel plate. 3. A shock-isolation layer soft contact limit mechanism according to claim 1, characterized in that: the buffer (2) is a spring or a rubber block.

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