WO2011152690A2

WO2011152690A2 - Seismic isolation device responding to earthquake having at least certain intensity

Info

Publication number: WO2011152690A2
Application number: PCT/KR2011/004105
Authority: WO
Inventors: 제희문
Original assignee: Je Hee Mun
Priority date: 2010-06-04
Filing date: 2011-06-03
Publication date: 2011-12-08
Also published as: WO2011152690A3; KR100971365B1

Abstract

The present invention relates to a seismic isolation device responding to an earthquake in which has a certain intensity, and the seismic isolation device comprises: a lower plate (100) having a plurality of lower moving units (110) formed thereon; an upper plate (200) arranged on the lower plate (100), and having a plurality of upper moving units (210) formed thereon and corresponding to the lower moving units (110); steel balls (300) which are in contact with and are interposed between the lower moving units (110) and the upper moving units (210), and allow the lower plate (100) and the upper plate (200) to move in a horizontal direction with each other; and minor-earthquake movement prevention units (400) for preventing the upper plate (200) from being horizontally moved on the lower plate (100) due to an earthquake of a weak intensity. Thus, the invention is capable of stably protecting the state of installation of structures or equipment or the like during the occurrence of an earthquake.

Description

Isolation device responding to an earthquake over a certain magnitude

The present invention relates to a seismic isolator, and more particularly, to a seismic isolator that responds to an earthquake of a certain magnitude or more that can safely protect a structure or equipment from an earthquake.

In general, an earthquake refers to a phenomenon in which the energy inside the earth comes to the surface and the ground is shaken and shaken. The earthquake is classified into a structural earthquake, volcanic earthquake and sinking earthquake according to the form and cause of occurrence.

Magnitude and intensity are used as a measure of the magnitude of the earthquake.

Among them, the scale is related to the wave energy emitted when an earthquake occurs, and is a quantity determined for a specific earthquake. On the other hand, magnitude is the magnitude of the earthquake based on its impact on buildings and terrain, and the United States' modified Mercalli (MM), which divided the earthquakes into 12 classes as a representative criterion for classifying the magnitude. There is a progression class.

According to the MM progress class, it was found that the intensity less than 3 had little effect on the installation state of the structure or equipment, and when the intensity exceeded 4, the installation state of the structure or equipment was generated.

Recently, as the frequency of earthquakes increases, various efforts have been made to reduce earthquake damage, and isolating isolators for protecting structures and equipment are one of them.

As shown in FIG. 1, the conventional seismic isolation device disclosed in Japanese Patent Laid-Open No. 10-220066 has a lower support plate 20 fixed to a base and having a constant inclined surface 22 on an inner side thereof, and an upper support plate fixed to a structure. 30, a steel ball 40 and a lower support plate 20 and an upper support plate which are installed between the lower support plate 20 and the upper support plate 30 to flow when the lower support plate 20 and the upper support plate 30 are horizontally displaced. 30 or

elastic rubbers

21 and 31 for setting a coefficient of friction on one surface of the steel ball 40.

However, the seismic isolation device as described above is provided with an inclined surface 22 only in the lower support plate 20, so that the return to the initial position is slow when an earthquake occurs, and the upper support plate is easy even in a weak earthquake (an earthquake of magnitude 3 or less in the MM magnitude class). There is a problem that the horizontal movement of (30) is made.

And when the structure or equipment placed on the upper support plate 30 has a large weight, cracks are generated in the elastic rubber (21, 31) is a factor that hinders horizontal movement during the earthquake.

It is an object of the present invention to provide a seismic isolator that responds to an earthquake of a certain magnitude or more that is selectively operated according to the magnitude of the earthquake as well as smoothly moving and returning horizontally.

An earthquake isolation device responding to an earthquake of a certain magnitude or more according to the present invention includes: a lower plate on which a plurality of lower flow units are formed; An upper plate disposed on the lower plate and having a plurality of upper flow units corresponding to the lower flow units; A steel ball interposed between the lower flow part and the upper flow part to allow horizontal movement of the lower plate and the upper plate; The technical characteristics of the upper plate is configured to include a weak flow prevention unit for preventing the horizontal movement of the lower plate by the earthquake of weak magnitude.

According to the present invention, the horizontal movement is not only smoothly made during the earthquake, but also by the weakly moving flow prevention part and the steel ball groove, the structure or the equipment is stably protected from the earthquake by operating only at an earthquake of a certain magnitude or more. can do.

In addition, it is possible to prevent the flow preventing ball from being separated to the outside through the fixing piece, it is easy to replace the spring or the flow preventing ball because the fixing piece has a removable structure.

And the lower plate is made of a non-conductor can prevent the leakage current generated by the earthquake to flow into the structure or equipment placed on the top of the seismic isolation device, it is possible to easily adjust the elastic force of the spring through the elastic adjustment bolt, the present invention Appropriate and adjustable to carry out horizontal movements relative to progress class 3.

1 is a cross-sectional view showing a conventional seismic isolator,

2 is a perspective view of a seismic isolator in response to an earthquake of a certain magnitude or more according to the present invention;

Figure 3 is an exploded cross-sectional view showing the seismic isolator in response to an earthquake of a certain magnitude or more according to the present invention,

Figure 4 is a perspective view showing a weak vibration prevention part of the seismic isolator in response to an earthquake of a certain magnitude or more according to the present invention,

Figure 5 is a cross-sectional view showing another embodiment of the weak vibration prevention unit of the seismic isolator in response to an earthquake of a certain magnitude or more according to the present invention,

6 and 7 is an operation state diagram of the base isolation device in response to an earthquake of a certain magnitude or more according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in Figures 2 to 4, the seismic isolator in response to an earthquake of a certain magnitude or more according to the present invention comprises a lower plate (100); An upper plate 200 disposed above the lower plate 100; A steel ball 300 provided between the lower plate 100 and the upper plate 200; It is configured to include a weak vibration prevention unit 400 provided between the lower plate 100 and the upper plate 200.

The lower plate 100 is fixed at the installation place and is horizontally moved by the shock wave when an earthquake occurs.

Upper and lower left and right four lower flow portion 110 is formed on the upper surface of the lower plate 100, the number and arrangement of the lower flow portion 110 can be changed as necessary.

The upper plate 200 has a shape symmetrical with the lower plate 100, even if the lower plate 100 is horizontally moved due to the occurrence of an earthquake more than a certain magnitude is not interlocked with this structure or equipment installed on the upper surface The state can be kept stable.

A plurality of upper flow portions 210 corresponding to the lower flow portions 110 of the lower plate 100 are formed on the lower surface of the upper plate 200.

The lower flow part 110 of the lower plate 100 and the upper flow part 210 of the upper plate 200 have a concave shape in which a predetermined inclination is formed toward the center thereof, thus returning to an initial state when an earthquake occurs. Of course, there is an advantage that the vertical movement displacement of the upper plate 200 according to the horizontal movement of the lower plate 100 is also made small.

In addition, hemispherical

steel ball grooves

111 and 211 are formed at the center of the lower flow part 110 and the upper flow part 210 to insert a portion of the steel ball 300. Not only maintains the installation state of the 100 and the upper plate 200 but also serves to limit the horizontal movement with the weak vibration prevention unit 400 when a weak earthquake (weak progress) occurs. In addition, the outer periphery of the lower flow section 110 and the upper flow section 210, the separation prevention jaw (120, 220) of a predetermined height is formed, respectively, the departure prevention jaw (120, 220) is a steel ball 300 is the lower flow section 110 And serves to prevent the outflow of the upper flow portion 220 to the outside.

And since the lower plate 100 and the upper plate 200 of the present invention is manufactured in the same shape, it can be produced through a single mold, and thus the lower plate 100 and the lower plate 200 is not molded separately It is easy to manufacture and can reduce the mold manufacturing cost.

On the other hand, when the wire is exposed to the outside due to an earthquake, the leakage current generated from the exposed wire may flow into the structure or equipment placed on the top of the seismic isolation device. In addition, there is a risk of significant damage.

Therefore, in the present invention, the lower plate 100 and the upper plate 200 are made of a non-conductor, in particular, a plastic material that is easy to manufacture a mold, it is preferable to prevent the secondary damage of the equipment due to the leakage current during the earthquake. .

The steel ball 300 is interposed between the lower flow portion 110 of the lower plate 100 and the upper flow portion 220 of the upper plate 200, the lower plate 100 and the upper plate 200 constant Rolling at the time of earthquake in the spaced apart state to enable the horizontal movement of the lower plate 100 and the upper plate 200 mutually.

Since the horizontal movement of the upper plate 200 is minimized by the steel ball 300 when the earthquake occurs, it can be effectively prevented from being damaged by the structure or equipment shake placed on the upper plate 200.

The weak flow prevention unit 400 prevents the upper plate 200 from being horizontally moved with respect to the lower plate 100 when the lower plate 100 moves horizontally due to an earthquake (weak progress) with a weak magnitude.

The weak vibration prevention unit 400 is provided two at regular intervals, the number and arrangement can be changed as necessary.

In particular, the weak flow prevention unit 400 of the present invention is not horizontally moved against a weak earthquake, but horizontally moved at a higher magnitude, wherein the selection criteria for the weak earthquake is the US Modified Mercalli (MM) magnitude rank. Follow.

The MM progress class is classified into 12 classes according to the degree of human response and the damage of buildings during an earthquake. Table 1 shows the classification criteria table of the MM progress class.

Table 1

Earthquake	Earthquake damage
One	none
2	Delicate hanging object shakes
3	A stationary car shakes slightly, resulting in vibrations and durations such as a truck passing by
4	Bowls, windows, doors, etc. shake and sound like cracking walls. Large trucks feel the wall.
5	Bowls and windows may break, and unfixed objects may fall
6	Heavy furniture moves and cracks in building walls
7	Damage can be neglected in well-designed and well-built buildings, but in general, slight damage occurs in poor buildings, considerable damage in poor buildings and collapse of chimneys.
8	Significant damage, including minor damage to specially designed buildings, partial collapse to general buildings, and severe damage to secondary buildings, commodities, chimneys, columns, monuments, and bricks
9	Significant damage to specially designed buildings, partial collapse of solid buildings, cracks on the ground, damage to underground water pipes
10	Most buildings break with foundations, severe cracks on the surface, rails warp and landslides
11	Few buildings remain and extensive cracking occurs on the surface, the surface sinks and the rails are severely bent
12	Total destruction, waves on earth's surface, warp horizontally and objects are thrown into the sky

As shown in Table 1, since the damage of a person or a building hardly occurs at the magnitude 3 or less of the MM magnitude, the present invention provides the weak vibration prevention unit 400. ), The seismic isolator is not operated below the magnitude 3, and the seismic isolator is operated only at the magnitude 4 or higher which may affect the structure or equipment.

The weak flow prevention unit 400 is a groove 102 formed in the lower plate 100; A spring 410 inserted into the recess 102; A fixing piece 430 coupled to an upper portion of the recess 102 and having a support hole 431 formed therein; A flow preventing ball 420 interposed between the spring 410 and the fixing piece 430, the upper end of which protrudes to the outside of the support hole 431; Is formed on the upper plate 200 is made of a flow preventing groove 401 is inserted into the flow preventing ball 420.

Groove 102 has a width and depth enough to accommodate the spring 410, the spring 410 can be replaced with another type of elastic body that can provide a certain elastic force.

And the fixing piece 430 is preferably coupled to the screw 440 in order to facilitate replacement when the spring 410 or the ball preventing ball 420, the fixing piece 430 is stable in the installation state It is seated in the fixing piece seating groove 101 formed in the lower plate 100 to maintain.

On the other hand, the weak flow prevention portion 400 is involved in the elastic force of the spring 410 and the depth of the flow preventing groove 401 into which the flow preventing ball 420 is inserted. However, in the case of the weak flow prevention groove 401 because it is difficult to control the depth, as shown in FIG. 5, the elastic adjustment bolt 411 is coupled to the bottom surface of the groove 102 to flow through the rotation operation. By selectively adjusting the elastic force of the spring 410 supporting the prevention ball 420 may control the operation of the weak flow prevention unit 400.

The operation of the base isolation device will be described below with reference to FIGS. 6 and 7.

First, when the earthquake of the magnitude that does not affect the installation state of the structure or equipment is generated, the seismic isolator is shown in Figure 6 when the horizontal movement of the lower plate 100, the weak vibration flow prevention unit 400 and the steel ball groove The lower plate 100 and the upper plate 200 are constrained to each other by (111, 211), and do not move horizontally to each other. At this time, the lower plate 100 is horizontal with the floor (or the ground) due to a weak earthquake. At the same time as the upper plate 200 is moved horizontally.

That is, when the earthquake is weak, the flow prevention ball 420 of the weak flow prevention part 400 is inserted into the flow preventing groove 401, and formed in the lower flow part 110 and the upper flow part 210, respectively. The

steel ball grooves

111 and 211 are maintained in a state where the steel ball 300 is inserted.

And when an earthquake of magnitude that may affect the installation state of the equipment or structure occurs, the lower plate 100 of the present invention is horizontally moved in response to the horizontal movement of the floor (or ground) by the earthquake, Rapid and strong horizontal movement of the lower plate 100 occurs due to the seismic force, so that the flow preventing ball 420 of the weak vibration prevention part 400 is separated from the flow preventing groove 401, and at the same time, the steel ball groove 111, As the restraint of the steel ball 300 inserted in the 211) is released, the horizontal movement strength of the lower plate 100 is reduced and transmitted relative to the upper plate 200, in addition to the weight of the equipment and the inertia of the upper plate and the equipment. According to the law, the horizontal movement is minimized, so the horizontal movement due to the seismic force is minimized.

In addition, as shown in Figure 7 after the horizontal movement of the lower plate 100, the steel ball 300 along the concave groove of the lower flow portion 110 and the upper flow portion 210 by the rolling motion of the initial It is moved to a position to maintain a stable posture so that the lower plate 100 and the upper plate 200 are positioned on the top and bottom of each other.

On the other hand, when the lower plate 100 and the upper plate 200 is moved horizontally by the steel ball 300 by the departure prevention jaw (120, 220) of the present invention, the horizontal movement range is limited and at the same time the steel ball 300 The lower flow portion 110 and the upper flow portion 210 is prevented from being separated to the outside.

Claims

A lower plate 100 on which a plurality of lower flow units 110 are formed;

An upper plate 200 disposed on the lower plate 100 and having a plurality of upper flow units 210 corresponding to the lower flow units 110;

A steel ball 300 interposed between the lower flow unit 110 and the upper flow unit 210 to horizontally move the lower plate 100 and the upper plate 200;

The upper plate 200 includes a weak flow prevention unit 400 for preventing the horizontal movement of the lower plate 100 by the earthquake of weak magnitude,

The weak flow prevention part 400 is a groove 102 formed in the lower plate 100; A spring 410 inserted into the groove 102; A fixing piece 430 coupled to an upper portion of the groove 102 and having a support hole 431 formed therein; A flow preventing ball 420 interposed between the spring 410 and the fixing piece 430 and having an upper end protruding to the outside of the support hole 431; A seismic isolator that responds to an earthquake of a certain magnitude or more, wherein the upper plate is formed on the upper plate 200 and includes a flow preventing groove 401 into which the top of the flow preventing ball is inserted.
The method according to claim 1,

The lower plate 100 is seismic isolation device in response to an earthquake of a certain magnitude or more, characterized in that the fixing piece seating groove 101 is formed on which the fixing piece 430 is seated.
The method according to claim 1 or 2,

The fixing piece 430 is seismic isolation device in response to an earthquake of a certain magnitude, characterized in that the screw is coupled.
The method according to claim 1,

The lower flow portion 110 and the upper flow portion 210 has a concave shape, the center is a certain progress, characterized in that formed in the center of the steel ball grooves (111, 211) into which a portion of the steel ball 300 is inserted A seismic isolator responding to the earthquake.
The method according to claim 4,

The steel ball groove 111, 211 is seismic isolation device in response to an earthquake of a certain magnitude or more, characterized in that having a hemispherical shape.
The method according to claim 1,

Seismic isolation in response to an earthquake of a predetermined magnitude or more, characterized in that the separation prevention jaw (120,220) is formed on the outer periphery of the lower flow portion 110 and the upper flow portion 210 to prevent the separation of the steel ball (300) Device.
The method according to claim 1,

The lower plate 100 and the upper plate 200 is an insulator is seismic isolation device in response to an earthquake of a predetermined magnitude or more.
The method according to claim 7,

The lower plate 100 and the upper plate 200 is seismic isolation device in response to an earthquake of a certain magnitude or more, characterized in that made of a plastic material.
The method according to claim 1,

The seismic weakness of the magnitude is seismic isolation device responsive to an earthquake of a certain magnitude or more, characterized in that less than the magnitude of the MM magnitude.
The method according to claim 1,

A seismic isolator that responds to an earthquake of a certain magnitude or more, further comprising an elastic adjustment bolt 411 coupled to the bottom surface of the groove 102 to adjust the elastic force of the spring 410 by a rotation operation.