JPH0139337Y2 - - 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]

Conventionally, earthquake-proof buildings built to avoid ground vibrations that occur as a result of pollution in the UK and elsewhere have used rubber bearings with relatively low vertical rigidity. This rubber bearing is interposed between the upper building and the lower foundation to provide vibration isolation from vertical vibrations in the ground.

However, since rubber bearings have very low not only horizontal rigidity but also vertical rigidity, when an earthquake occurs, the upper building will be displaced horizontally, and the rubber bearings around the building will expand and contract, resulting in a large rocking displacement (in the direction of collapse) as a whole. displacement). Therefore, such building vibration isolation construction methods cannot be adopted as they are in earthquake-prone countries like Japan.

[Purpose of invention]

This idea was devised to solve the above-mentioned problems. It is possible to avoid the vertical vibration of the ground, suppress the rocking displacement of the building, and reduce the relative relationship between the building and the ground caused by an earthquake. It is an object of the present invention to provide a locking stopper that does not prevent horizontal displacement from being absorbed by a rubber bearing.

[Structure of the idea]

The locking stopper according to this invention has a solid viscoelastic substance sandwiched between two parallel pressure-receiving plates, and a fixing plate is placed facing each of the two pressure-receiving plates, and one of the fixing plates is solid. It contacts the pressure receiving plate via a lubricant layer, and a spacer rubber is interposed between the other fixed plate and the pressure receiving plate to form a clearance therebetween.

The clearance formed between the fixed plate and the pressure plate absorbs vertical vibrations in the ground caused by pollution, and the solid viscoelastic material minimizes rocking displacement.
The solid lubricant layer prevents horizontal displacement between the pressure receiving plate and the fixed plate from being restricted.

〔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 solid viscoelastic material 3 fixed between two parallel pressure receiving plates 1,1. 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, it is possible to use a material such as viscoelastic rubber, which hardens when subjected to a strain rate of a certain level or more, and which absorbs a large amount of energy.

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 engaging 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 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.

When the rocking stopper A is installed between the rafts, it is set so that a certain clearance c is created between the fixed plate 6 and the pressure receiving plate 1, so that the vertical support rubber mounting 8 Even if expansion and contraction occur due to temperature changes or creep,
Due to the fluid nature of the solid viscoelastic material 3, the clearance c remains constant.

In addition, since the vertical rigidity of the spacer rubber 7 is relatively negligible compared to the vertical rigidity of the vertical support rubber mounting 8, the locking stopper A has no effect on the vertical rigidity of the upper building B within the range of the clearance c. 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 the vertical vibration of the ground.

When rocking vibration occurs in the upper building B due to an earthquake, the rocking stopper A moves the upper building B
Although the viscoelastic material 3 is compressed by the vertical displacement of
The hardening and damping effect minimizes rocking displacement.

On the other hand, the upper building B is resistant to earthquake horizontal force due to the combination of the horizontal rigidity of the vertical support rubber mounting 8, the horizontal rigidity of the horizontal support rubber mounting 9, and the horizontal elastic-plastic characteristics of the hysteretic damper 10. On the other hand, the response of building B 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, since the solid lubricants 5a and 5a of the solid lubricant layer 5 of the locking stopper A slide against each other,
The rocking stopper A does not affect the horizontal stiffness (horizontal natural frequency) of the upper building B,
It does not interfere with the seismic isolation effect.

[Effects of the invention] This invention has the above-mentioned configuration and uses a viscoelastic material, so it is possible to minimize the rocking displacement of a seismically isolated building due to an earthquake. Since a certain level of clearance is secured, the vibration isolation 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 the drawing]

FIG. 1 is a side view of an embodiment of the locking stopper according to this invention, and FIG. 2 is a longitudinal sectional view thereof.
3 is a sectional view taken along the - line, FIG. 4 is a sectional view taken along the - line, FIG. 5 is a vertical sectional view of the seismically isolated and vibration-proof building, and FIG. 6 is a sectional view taken along the - line. A... Rocking stopper, B... Upper building, C... Lower foundation, c... Clearance, 1
... Pressure receiving plate, 3 ... Viscoelastic substance, 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 damper.

Claims (1)

[Scope of utility model registration request] A solid viscoelastic substance is sandwiched between two parallel pressure-receiving plates, and a fixed plate is placed facing each of the two pressure-receiving plates, and one of the fixed plates contacts the pressure-receiving plate through a solid lubricant layer. A locking stopper characterized in that a spacer rubber is interposed between the other fixing plate and the pressure receiving plate so that a clearance is formed between the two.