JPS6332278Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a locking stopper that prevents rocking in seismically isolated and vibration-proof buildings.

[Prior art]

Traditionally, in the UK and other countries, vibration-isolated buildings constructed to avoid ground vibrations that are a pollution nuisance have used vibration-isolation rubber with low vertical rigidity. This vibration-isolation rubber is placed between the upper building and the lower foundation to isolate the building from vertical vibrations of the ground.

However, since the anti-vibration rubber has very low not only horizontal rigidity but also very low vertical rigidity, when an earthquake occurs, the upper building will be displaced horizontally and the anti-vibration rubber around the building will expand and contract, resulting in a large rocking displacement ( (displacement in the direction of falling down). Therefore, such building vibration isolation methods cannot be directly applied to earthquake-prone countries.

[Purpose of invention]

This idea was made to solve the above problems, and it is possible to avoid vertical vibrations of the ground, suppress the rocking displacement of buildings during earthquakes, and prevent buildings from collapsing due to earthquakes. To provide a rocking stopper that does not prevent absorption of relative horizontal displacement of the ground by seismic rubber.

[Structure of the idea]

The locking stopper according to this invention encloses a viscoelastic substance in the space formed by two parallel pressure receiving plates and an elastic shell covering the outer periphery, and one pressure receiving plate has a solid lubricant layer. abut the fixed plate through the
The above objective is achieved by ensuring a certain clearance between the other pressure receiving plate and the fixed plate.

〔Example〕

This invention will be explained in detail below based on an embodiment shown in the drawings.

In the figure, A is a locking stopper according to this invention.

The locking stopper A has a viscoelastic substance 3 sealed in a space formed by two parallel pressure receiving plates 1 and an elastic shell 2 made of rubber or the like covering the outer periphery thereof. The pressure receiving plates 1, 1 are metal disks, and one pressure receiving plate 1 has a plurality of circular engagement recesses 4 on its outer surface.
is recessed. As the viscoelastic material 3, a material that hardens when subjected to a strain rate of a certain value or higher, such as viscoelastic rubber, can be used.

A fixed plate 6 is brought into contact with one pressure receiving plate 1 via a solid lubricant layer 5 . This pressure receiving plate 1 has no engagement recess 4, and a solid lubricant 5a such as a fluororesin sheet is laid on the outer surface. A solid lubricant 5a is also applied to one surface of the fixed plate 6.
A solid lubricant layer 5 is formed by both solid lubricants 5a, 5a.

A certain clearance c is ensured between the other pressure receiving plate 1 and the fixed plate 6. A cylindrical spacer rubber 7 is provided in a protruding manner on the fixed plate 6 in correspondence with the engagement recess 4 of the pressure receiving plate 1. The height of the spacer rubber 7 is higher than the depth of the engagement recess 4, and when the spacer rubber 7 is fitted into the engagement recess 4, a clearance c is formed between the pressure receiving plate 1 and the fixed plate 6.

The case where the locking stopper A having the above-mentioned configuration is used in a seismically isolated and vibration-proofed building will be explained.

A locking stopper A is interposed between the upper building B and the lower foundation C. Locking stopper A is placed on the outer periphery of the seismic isolation and vibration isolation building. The locking stopper A fixes the fixing plates 6, 6 with bolts to a pedestal provided protruding from the raft of the upper building B and the lower foundation C.

Rubber mounting 8 for vertical support is also attached to upper building B
and fixed to the raft pedestal of the lower foundation C.

The vibration-proof rubber mounting 9 for horizontal support and the hysteretic damper 10 are horizontally attached to the raft sides of the upper building B and lower foundation C with end plates fixed at both ends.

The operation of the locking stopper A in the above-mentioned seismically isolated and vibration-proofed building will be explained.

The rigidity of the elastic shell 2 and the spacer rubber 7 of the locking stopper A is set so that a certain clearance c is created between the fixed plate 6 and the pressure receiving plate 1 when installed between the rafts. Even if the vertical support rubber mounting 8 undergoes expansion/contraction due to temperature changes or creep, it remains constant due to the force balance between the elastic shell 2 and the spacer rubber 7 and the fluidity of the viscoelastic material 3.

This clearance c is ensured, and
Since the vertical rigidity of the spacer rubber 7 is negligibly small compared to the vertical rigidity of the vertical support rubber mounting 8, the locking stopper A contributes to the vertical rigidity of the upper building B within the range of the clearance c. Without this, the vertical vibration of the ground due to pollution is absorbed by this clearance c, and the rocking stopper A does not affect the vibration isolation effect against vertical vibration of the ground. When rocking vibration occurs in the upper building B due to an earthquake, the rocking stopper A is compressed by the vertical displacement of the upper building B, and the viscoelastic material 3 sealed inside hardens to minimize the rocking displacement. suppress.

On the other hand, the upper building B has the horizontal rigidity of the vertical support rubber mounting 8, the horizontal rigidity of the horizontal support rubber mounting 9, and the hysteretic damper 1.
By combining the horizontal elastic-plastic properties of 0, the response of building B to the seismic horizontal force can be set to be optimal. As the rocking displacement of Building B is suppressed to a minimum by the rocking stopper A as described above, the vibration mode of Building B is almost exclusively horizontal translational vibration, making it immune to horizontal ground vibrations caused by earthquakes. A seismic effect can be obtained.

At this time, the solid lubricants 5a, 5a of the solid lubricant layer 5 of the locking stopper A slip, so the locking stopper A does not affect the horizontal rigidity (horizontal natural frequency) of the upper building B. It does not interfere with the seismic isolation effect.

[Effect of idea]

This invention has the above-mentioned configuration and contains a viscoelastic material, so it is possible to minimize the rocking displacement of a seismically isolated and vibration-proofed building due to an earthquake.
Since a certain level of clearance is secured, the anti-vibration effect against vertical vibrations in the ground caused by pollution will not be hindered. Furthermore, since a solid lubricant layer is provided, the seismic isolation effect in the horizontal direction is not hindered.

[Brief explanation of drawings]

Fig. 1 is a side view of one embodiment of the locking stopper according to this invention, Fig. 2 is a longitudinal sectional view, and Fig. 3 is a longitudinal sectional view.
The figure is a - line sectional view, Figure 4 is a - line sectional view,
Figure 5 is a longitudinal cross-sectional view of a seismic isolation and vibration-proof building, and Figure 6 is -
FIG. A... Rocking stopper, B... Upper building, C... Lower foundation, c... Clearance, 1...
...Pressure plate, 2...Elastic shell, 3...Viscoelastic material, 4
... Engagement recess, 5 ... Solid lubricant layer, 6 ... Fixing plate, 7 ... Spacer rubber, 8 ... Rubber mounting for vertical support, 9 ... Rubber mounting for horizontal support, 10 ... Hysteresis Retique damper.

Claims (1)

[Scope of utility model registration request] A viscoelastic substance is sealed in a space formed by two parallel pressure receiving plates and an elastic shell covering the outer periphery, and a fixed plate is brought into contact with one pressure receiving plate through a solid lubricant layer, and the other pressure receiving plate is in contact with a fixed plate through a solid lubricant layer. A locking stopper characterized by ensuring a certain clearance between the pressure receiving plate and the fixed plate.