JPH094280A - Seismic isolating method - Google Patents

Abstract

PURPOSE: To prevent a structure to be seismic-isolated from falling down by interposing a housing member which houses a seismic isolation material which is further liquefied by seismic waves between an underground area where the seismic waves are transmitted and the seismic isolated article and allowing the seismic isolated material to support the seismic isolated article during a normal time and shutting down the transmission of seismic waves to the seismic isolated article by liquefying the seismic isolation material when an earthquake occurs. CONSTITUTION: A seismic isolation material 8 is so arranged that its interparticle bonding is broken by the vibration of seismic waves and its granular material, which has been solidified hitherto, is liquefied resultantly. The seismic isolation material 8 is spread over a first concrete foundation 6. As a result, when the first concrete foundation 6 is vibrated by seismic waves which are transmitted through an underground area 3, the seismic isolation material 8 causes a liquefied phenomenon accompanied by the vibrations. When the seismic isolation material 8 causes the liquefied phenomenon, a building, which is an seismic isolated structure with an upper mat foundation constructed on the seismic isolation material 8 is forced to sink. When the earthquake ends and the seismic waves ceases, the water floating on the surface of the seismic isolation material 8 sinks down, so that the liquefied seismic isolation material 8 solidifies again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation construction method for preventing collapse, destruction and damage of a body to be isolated, such as a building, a buried pipe and an electric pole due to an earthquake, and more specifically, to absorb a seismic wave to be isolated. It relates to something that blocks the propagation of seismic waves to the body.

[0002]

2. Description of the Related Art Conventionally, there has been a structure in which a building or the like is provided with a seismic design in order to prevent collapse, destruction, damage, etc. due to an earthquake. There are some that are made to be rigid. However, thickening the pillars and beams in this way makes the building larger, so even if such an earthquake-resistant design can be applied to ordinary buildings, it is difficult to apply it to high-rise buildings, for example. There are cases.

Therefore, when building a high-rise building,
Instead of implementing a seismic design, for example, install a shock absorber between the building and the ground where the seismic wave propagates, and use this shock absorber to absorb or reduce the shaking due to the seismic wave to prevent the body to be isolated from collapsing. In some cases, the vibration isolation method will be introduced.

[0004]

By the way, in such a conventional vibration isolating construction method, a spring, a rubber bowl, etc. are provided as a shock absorbing device, and the seismic wave is absorbed by the elastic force of these springs, rubber, etc. However, there is a problem in that the device having such a structure has a complicated structure and must be regularly maintained and maintained.

On the other hand, the vibration-isolating construction method in which the vibration-absorbing device is used to protect the vibration-isolated body is large-scaled, so that it can be applied to a large vibration-isolated body such as a high-rise building. There is a problem in that it cannot be used for small vibration-isolated bodies such as gas pipes and water pipes buried in, and telephone poles planted on the ground.

[0006] Therefore, a first object of the present invention is to provide a vibration isolation method which has a simple structure and does not require maintenance.

A second object of the present invention is to provide a vibration isolation method capable of protecting a vibration-isolated body such as a telephone pole planted on the ground with a simple structure.

A third object of the present invention is to provide a vibration isolation method capable of protecting a vibration-isolated body such as a pipe buried in the ground with a simple structure.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and includes a container for accommodating a vibration isolation material that is liquefied by an earthquake wave, and the seismic wave is propagated through the container. Between the ground and the vibration-isolated body to be isolated, the vibration-isolation material normally supports the vibration-isolation body, and the vibration-isolation material is liquefied when an earthquake occurs. This is a vibration isolation method in which the propagation of the seismic wave to the body to be isolated is blocked.

Further, the vibration-isolating material is composed of a liquid and particles which are normally bonded and solidified by the interposition of the liquid, and when an earthquake occurs, the intergranular bond is broken by the seismic waves to be liquefied. There is a vibration isolation method.

Further, in the case of planting the vibration-isolated body, there is a vibration-isolation construction method in which the underground portion of the vibration-isolated body is covered with the storage body.

When the vibration-isolated body is embedded,
In the vibration isolation method, the outer surface of the vibration-isolated body is covered with the storage body.

[0013]

[Function] Based on the above configuration, while the vibration isolation material that is liquefied by the seismic wave is stored in the storage body, the storage body is placed between the ground where the seismic wave propagates and the vibration-isolated body to be isolated. By interposing, the vibration-isolated material can normally support the vibration-isolated body. Further, when the earthquake occurs, the vibration isolation material is liquefied, so that the propagation of the seismic wave to the vibration-isolated body can be blocked and the vibration-damped body can be prevented from collapsing.

Further, the vibration-isolating material is composed of liquid and granules, and the granules are usually bonded and solidified by the interposition of liquid, while the intergranular bond is broken by the seismic wave when an earthquake occurs. Try to liquefy the granules.

Further, when the vibration-isolated body is planted, the ground-isolated portion of the vibration-isolated body is covered with a container, and the vibration-damping material is liquefied when an earthquake occurs, so Block the propagation of seismic waves to the vibration body to prevent breakage of the body to be isolated.

Further, when the vibration-isolated body is buried in the ground, by covering the outer surface of the vibration-isolated body with a container and liquefying the vibration-damping material when an earthquake occurs, When it occurs, the vibration isolation material is liquefied to block the propagation of seismic waves to the vibration-isolated body and prevent damage to the vibration-isolated body.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a high-rise building constructed by applying the vibration isolation method according to the present invention. The building 1 is built on a double type solid foundation 2. And this 2
The heavy type solid foundation 2 is a first foundation concrete foundation 6 which is built after the pile 4 and the root cutting 5 are constructed inside the ground 3,
It is composed of an upper solid foundation 7 which is arranged above this first foundation concrete foundation 6 and on which the building 1 is directly built.

Here, this first foundation concrete foundation 6
Is a container for accommodating the vibration-isolating material 8 therein, and is constructed in a pool-like shape with an opening at the top. on the other hand,
The vibration-isolating material 8 is, for example, a particle (sand in this embodiment) such as sand having a predetermined thickness (several tens of centimeters) laid inside the first basic concrete foundation 6, and water, seawater, or the like. The liquid (in this embodiment, water) is mixed to solidify the granules, and the upper solid foundation 7 is placed on the vibration-isolating material 8 which is the artificial ground thus solidified. It is supposed to be built.

By the way, the vibration-isolating material 8 was in a solid state until the intergranular bond was broken by vibrating by the seismic wave when an earthquake with a magnitude larger than the set seismic intensity occurred. The granules are configured to liquefy, and by laying such a vibration isolation material 8 on the first foundation concrete foundation 6, the first foundation concrete foundation 6 propagates through the ground 3. When vibrated by an earthquake wave, the vibration isolating material 8 causes a liquefaction phenomenon with this vibration.

When the vibration isolating material 8 undergoes the liquefaction phenomenon in this way, the building 1 which is the body to be isolated sinks together with the upper solid foundation 7 built on the vibration isolating material 8. become. However, even if the building 1 sinks in this way, the seismic wave is blocked by the liquefied isolation material 8 due to the liquefaction phenomenon of the isolation material 8 and propagates to the building 1. No, the building 1 will not collapse due to this. When the vibration isolation material 8 undergoes a liquefaction phenomenon, water usually floats on the surface of the vibration isolation material 8.

On the other hand, as shown in FIGS. 2 and 3, on the inner bottom surface 6a and the inner side surface 6b of the first foundation concrete foundation 6, a large number of secondary vibration isolator 9, 9 formed of an elastic body such as hard rubber is used.
Is fixed. Here, the secondary vibration isolator 9, 9 is for holding the building 1 that has been submerged due to the liquefaction phenomenon of the vibration isolation material 8 and then holding it without tilting. It is possible to prevent the building 1 from tilting by a predetermined angle or more and from damaging the inner bottom surface 6a of the first foundation concrete foundation 6 by the swing members 9 and 9. Furthermore, when an earthquake occurs like this, the building 1
By retaining the secondary vibration isolator 9 with 9, the building 1 can be protected even if an aftershock occurs thereafter.

In this embodiment, a spring joint anchor 10 is attached to the upper end of the first foundation concrete foundation 6 as shown in FIG. Here, this spring joint anchor 10
Is to prevent lateral slippage of the building 1 by absorbing lateral seismic waves by bringing the moving end into contact with the upper solid foundation 7, and thus restricting lateral slippage. By doing so, the subducting building 1 can be securely held by the secondary vibration isolator 9, 9.

On the other hand, when the earthquake is over and the seismic wave disappears, the water floating on the surface of the vibration isolating material 8 sinks into the sand and the liquefied vibration isolating material 8 solidifies again. As a result, the building 1 is jacked up as described later, and then supported again by the vibration isolating material 8 thus solidified. When liquefying, the sand and water of the vibration isolation material 8 may spring up to the surface of the earth, but in this case, the double isolation method is used so that the vibration isolation material 8 can securely support the building 1 after the end of the earthquake. Make sure to replenish the inside of the solid foundation 2 with water or sand.

By the way, the side wall 6A of the first foundation concrete foundation 6 has a drain hole 11 formed therein.
A blocking plate 12 is attached between the concrete foundation 6 and the upper solid foundation 7 so that a large amount of rainwater or the like does not soak into the vibration isolating material 8. The drainage hole 11 and the closing plate 12 prevent the vibration-isolating material 8 from containing more than the required amount of water, which causes rain or the like until an earthquake of a magnitude greater than the set seismic intensity occurs. The vibration-isolating material 8 can be kept in a solidified state even when it falls. In addition, in this way, the drain hole 11 and the closing plate 1
Since the material 8 for vibration isolation can be maintained in a solid state in 2,
There is no need to perform maintenance especially in case of an earthquake.

On the other hand, a plurality of jack-up devices 13 are attached to the upper solid foundation 7, and the jack-up devices 13 can be used to jack up the building 1 that has been sunk by an earthquake. By allowing the building 1 to be jacked up in this manner, it is possible to promptly restore the building 1 to the state before the subduction after the earthquake is over. In the figure, 14 is an internal waterproof material, and 15 is a gravel grain preparation material.

Next, the vibration isolation function of the vibration isolation method constructed as described above will be described.

When an earthquake of a magnitude greater than the set seismic intensity occurs, the seismic wave propagating in the ground 3 vibrates the first foundation concrete foundation 6 and, as a result, the vibration isolation material stored in the first foundation concrete foundation 6. 8 vibrates and causes a liquefaction phenomenon.

When the vibration isolating material 8 liquefies in this way, the building 1 sinks together with the upper solid foundation 7, but seismic waves are generated by the liquefaction phenomenon of the vibration isolating material 8. Building 1 is not transmitted and building 1 does not collapse. In addition, the building 1 submerged by the liquefaction phenomenon of the vibration isolation material 8 in this way is
Since the movement in the lateral direction is restricted by 0, it is held by the secondary vibration isolator 9 without tilting.

When the earthquake ends and the seismic wave disappears, the submerged building 1 is first jacked up by the jack-up device 13 to promptly restore the building 1 to the state before subduction. Also, when the seismic wave disappears, the water floating on the surface of the vibration isolation material 8 sinks into the sand, and eventually the liquefied vibration isolation material 8 solidifies again, so the building was jacked up. 1 is again supported by the solidified isolating material 8. Note that when liquefied, if sand, water, or the like of the vibration isolation material 8 springs up on the ground surface, the water or sand is replenished.

In this way, the vibration isolating material 8 is interposed between the building 1 and the first foundation concrete foundation 6 and the liquefaction phenomenon is generated in the vibration isolating material 8 when an earthquake occurs, so that the building 1 Building 1 to prevent the propagation of seismic waves to
Can be prevented from collapsing. Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a side sectional view of an essential part of a foundation portion of a low-rise building. In FIG. 4, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions.

In the figure, 16 is a building cloth foundation,
A low-rise building 1A is constructed on the building cloth foundation 16. In addition, 17 is a primary vibration isolation system pallet (hereinafter referred to as a pallet) which is a container that supports the building cloth foundation 16 and stores the vibration isolation material 8, 18 is discarded concrete, and 19 is chestnut. Here, as shown in FIG. 5, the pallet 17 is provided inside a box-shaped container (hereinafter, referred to as a pallet container) 20 formed of a resin having a predetermined strength, such as plastic or vinyl chloride (hereinafter referred to as a pallet container). It is formed by filling and sealing.

The pallet container 2 of this pallet 17
Although 0 depends on the load of the building 1A to be built, it is formed in a size that can be carried into a construction site, and the vibration-isolating material 8 is, for example, sand (dry sea sand) after being vibration-pressed, The pallet container 20 is filled and hermetically sealed by injecting seawater at a rate suitable for causing a liquefaction phenomenon obtained by an experiment or the like and then sealing it.

The sand thus filled and sealed is in a state of being hardened by water, and the solid vibration isolating material 8 is hardened in this way, so that the pallet 17 is hardened and supports the building 1A. Is able to. The number of pallets 17 arranged under the building cloth foundation 16 is proportional to the load of the building 1A.
When the weight is heavy, it is arranged continuously, and when the weight is light, it is arranged at a predetermined interval.

By the way, the pallet 17 formed in this way vibrates when an earthquake occurs, whereby the vibration-isolating material 8 filled in the pallet 17 causes a liquefaction phenomenon. When the vibration-isolating material 8 that hardens the pallet 17 causes a liquefaction phenomenon, the pallet container 20 alone cannot support the building 1A and the building 1A sinks. However, by thus softening the pallet 17 that normally supports the building 1A in a rigid state when an earthquake occurs, it is possible to prevent the seismic wave from propagating to the building 1A, and thus prevent the building 1A from collapsing. You can

On one side of this pallet 17, FIG.
The curved notch 21 is formed as shown in FIG.
When the two pallets 17 are arranged side by side by forming the notch 21 in this way, a storage portion 22 as shown in FIG.
To be able to form.

The accommodating portion 22 is for accommodating the cylindrical secondary vibration isolator 9, 9 and thus the secondary vibration isolator 9, 9 is accommodated between the pallets 17. As a result, the building 1A that sinks can be held horizontally. On the other hand, the height of the secondary vibration isolator 9, 9 is lower than the height of the pallet 17 as shown in FIG. 7, and when the pallet 17 becomes softer, the building 1
A can be sunk without being hindered by the secondary vibration isolator 9, 9 and can be horizontally held by the secondary vibration isolator 9, 9 after being sunk.

Although the pallet 17 has been described as being placed below the building cloth foundation 16, the pallet 1
By arranging 7 to the side of the building cloth foundation 16, it is possible to prevent lateral seismic waves from propagating to the building 1A, and to protect the building 1A more effectively.

Next, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 8 is a view showing the lower part of the telephone pole that has been planted.

In the figure, numeral 23 is a utility pole, and a semi-cylindrical pallet 24 is fixed to the underground portion of the utility pole 23 with a fixing band 25. Here, this semi-cylindrical pallet 24 is, as shown in FIG. 9, a semi-cylindrical container (hereinafter referred to as a semi-cylindrical container) 26 formed of a resin having a predetermined strength such as plastic or vinyl chloride. It is formed by filling the inside with the vibration-isolating material 8 and then sealing it. The method of filling the vibration-isolating material 8 is the same as that of the pallet 17 described above.

By the way, the vibration-isolating material 8 thus filled and sealed in the semi-cylindrical container 26 is in a solid state, and the semi-cylindrical pallet 24 is also solid by solidifying the inside in this way. Therefore, by fixing such a semi-cylindrical pallet 24, the diameter of the underground portion of the utility pole 23 becomes large, and the utility pole 23 can stand in a more stable state. Reference numeral 26 is a sling material for stabilizing the electric pole 23.

By the way, the semi-cylindrical pallet 24 formed in this way vibrates when an earthquake occurs, so that the vibration isolating material 8 filled therein causes a liquefaction phenomenon. Then, in this way, the vibration isolation material 8
When the liquefaction occurs, the semi-cylindrical pallet 24 becomes soft and the utility pole 23 swings around the ground surface as a fulcrum as shown in FIG.

When the utility pole 23 oscillates in this way, the shearing force applied to the utility pole 23 becomes smaller than that of a conventional utility pole in which the underground portion is fixed and the ground surface portion sways as a fulcrum. It is possible to prevent the utility pole 23 from being broken. When the electric pole 23 swings in this way, when the earthquake ends, the vibration-isolating material 8 that has undergone a liquefaction phenomenon is the electric pole 23.
Since the electric pole 23 cannot be supported, the electric pole 23 may be inclined. In this case, when the tilted utility pole 23 is held straight after the end of the earthquake, the vibration-isolating material 8 in the semi-cylindrical pallet 24 eventually solidifies again, which causes the utility pole to be solidified again. 23 will be fixed while standing upright.

Next, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 11 is a front sectional view of a pipe such as a gas pipe buried in the ground.

In the figure, 27 is a pipe buried in the ground, and a semi-cylindrical pallet 24 is fixed to the pipe 27 by a fixing band 25. Then, when an earthquake occurs, the vibration isolating material 8 filled inside undergoes a liquefaction phenomenon and the semi-cylindrical pallet 24 becomes soft,
As a result, it is possible to prevent the seismic wave from propagating to the pipe 27 and prevent the pipe 27 from being damaged.

By the way, when protecting the pipe 27 in this way, the semi-cylindrical pallet 24 is effective for protecting a relatively short portion such as a bent portion or a joint portion of the pipe 27, but one long pipe is used. In order to protect the pipe, the pipe 27 may be covered with a cylindrical pallet 28 having the vibration-isolating material 8 filled therein as shown in FIGS. The cylindrical pallet 28 may be formed by filling a cylindrical container with the vibration isolating material 8 or by forming the vibration isolating material 8 by laminating or the like. Good.

On the other hand, when burying a rectangular shape such as a concrete trench 29 as shown in FIG. 14,
The plate-shaped pallet 30 covers the entire circumference to prevent the seismic wave from propagating to the concrete trench 29 and prevent damage to the trench 29.

In this way, the pipe 27 and the trench 29 are
By protecting the pallets with the pallets 28 and 29, it is not necessary to cover the periphery of the pipe 27 and the like with mountain sand as in the conventional case, so that the cost can be reduced. Further, by not using the sand and sand in this way, it is possible to reduce the load on the pipe 27 and the like when an earthquake occurs because the sand and sand are not integrated with the original geology, and damage to the pipe 27 and the like is prevented. You can prevent it.

By the way, in the above description, the vibration isolating material 8 has been described as being composed of sand which is a granular body and water which is a liquid. The present invention is not limited to this, and the vibration isolating material is not limited to this. Spherical metal or scientific aggregate may be used as the granules constituting 8, and oil or the like may be used as the liquid.

In the above description, the vibration isolating material 8 has been described as being liquefied by vibration due to seismic waves. However, for example, the vibration isolating material 8 is made of a substance that liquefies by energization. On the other hand, this vibration isolating material may be combined with a sensor that outputs an energization signal when an earthquake is detected. With such a configuration, when an earthquake occurs, the vibration isolation material 8 is immediately liquefied based on the energization signal from the sensor, and the vibration-isolated body can be protected.

[0054]

As described above, according to the present invention, by interposing the housing containing the material for vibration isolation between the ground where the seismic wave is propagated and the vibration-isolated body to be isolated, At the time of occurrence, the vibration isolating material can be liquefied to block the propagation of seismic waves to the vibration-isolated body, and thus the vibration-damaged body can be prevented from collapsing. Further, by liquefying the material for vibration isolation in this way to prevent the body to be isolated from collapsing, the structure can be simplified, and since springs and rubbers are not used, maintenance work is not required. There is no need, and costs can be reduced.

When a vibration-isolated body such as a utility pole is planted, the grounding part of the vibration-isolated body is covered with a storage body so that the vibration-isolation material can be used when an earthquake occurs. It can be liquefied to block the propagation of seismic waves to the vibration-isolated body, and the vibration-damaged body can be prevented from being broken by a simple structure.

Furthermore, when a vibration-isolated body such as a pipe is buried in the ground, the outer surface of the vibration-isolated body is covered with a storage body so that the vibration-damping material can be used when an earthquake occurs. It can be liquefied to block the propagation of seismic waves to the body to be isolated,
With a simple structure, it is possible to prevent damage to the body to be isolated.

[Brief description of drawings]

FIG. 1 is a side sectional view of a high-rise building constructed by applying a vibration isolation method of the present invention.

FIG. 2 is a plan sectional view of the building.

FIG. 3 is an enlarged side sectional view of a main part of the building.

FIG. 4 is a side sectional view of an essential part of a foundation portion of a low-rise building constructed by applying the vibration isolation method of the present invention.

FIG. 5 is a perspective view of a primary vibration isolation system pallet attached to the foundation of the low-rise building.

FIG. 6 is a plan view of the primary vibration isolation system pallets arranged side by side.

FIG. 7 is a side sectional view of the primary vibration isolation system pallets arranged side by side.

FIG. 8 is a view showing a lower portion of an electric pole that has been planted.

FIG. 9 is a perspective view of a semi-cylindrical pallet attached to a utility pole.

FIG. 10 is a diagram showing how a utility pole swings.

FIG. 11 is a front cross-sectional view of a pipe such as a gas pipe buried in the ground.

FIG. 12 is a front sectional view of a pipe such as a gas pipe surrounded by a cylindrical pallet.

FIG. 13 is a side view of a pipe such as a gas pipe surrounded by a cylindrical pallet.

FIG. 14 is a front sectional view of a trench surrounded by a box-shaped pallet.

[Explanation of symbols]

 1,1A Building 6 1st foundation concrete foundation 8 Vibration isolation material 17 Primary vibration isolation system pallet 20 Pallet container 23 Electric pole 24 Semi-cylindrical pallet 26 Semi-cylindrical container 27 Piping 28 Cylindrical pallet 30 Plate pallet

Claims (4)

[Claims] 1. A storage body containing a vibration-isolating material that is liquefied by seismic waves, and the storage body is interposed between the ground where the seismic waves propagate and a vibration-isolated body to be isolated. Usually, the vibration isolating material supports the body to be isolated, and when an earthquake occurs, the vibration isolating material is liquefied to block the propagation of the seismic wave to the body to be isolated. Characteristic vibration isolation method. 2. The vibration-isolating material is composed of a liquid and particles which are normally bonded and solidified by the interposition of the liquid, and when an earthquake occurs, the intergranular bond is broken by the seismic waves to be liquefied. The vibration-isolated construction method according to claim 1, wherein 3. The plant according to claim 1, wherein, when the vibration-isolated body is planted, the ground portion of the vibration-isolated body is covered with the storage body. Vibration isolation method. 4. The vibration isolation system according to claim 1, wherein when the vibration-isolated body is embedded, the outer surface of the vibration-isolated body is covered with the storage body. Construction method.