JP2023068239A - Base isolation system - Google Patents

Abstract

To provide a base isolation system for a wooden construction housing in a simpler structure than previous ones and at lower cost.SOLUTION: A wooden construction housing supports a wooden structural body of an upper structure by a lower structural body mainly composed of base concrete, wherein a sliding support structure is arranged on an upper part of the base concrete, and an upper surface of the sliding support structure contacts and supports a base isolation cradle of a lower part of the wooden construction housing. Coefficients of static friction between sections relating to the contacting and supporting are adjusted, and upon an earthquake equal to or greater than a predetermined intensity, a base slides on the supporting structure to generate relative positional displacement, so that earthquake energy is absorbed for base isolation. The defection generated through the base displacement is off-set with horizontal displacement force caused by motion of the base position adjustment system.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic isolation system, and more particularly to a seismic isolation system for a wooden detached building.

Conventionally, wooden detached buildings have generally been of the type in which foundation concrete provided on the ground and the base of a wooden structure are fixedly connected by anchor bolts.
When an earthquake occurs, the energy of the earthquake is transmitted to the wooden structure through the foundation. As a result, seismic energy is transmitted to wooden structures, causing problems such as overturning of indoor furniture, damage to the interior due to such overturning, and injuries to people inside the building.
Recently, as an anti-earthquake measure, a system has been proposed in which a seismic isolation device is installed between a building and its foundation to separate the upper wooden structure from the ground, thereby preventing the direct transfer of seismic energy.
However, since such a seismic isolation device has a complicated configuration including ball bearings and the like and is expensive, there are problems of difficulty in construction and high cost in order to popularize the construction in individual homes.

Patent Document 1 describes a seismic isolation device installed between a foundation fixed to a building and the foundation of the building.
This seismic isolation device consists of a sliding bearing attached to the foundation of the building, a bearing sliding base for supporting the sliding bearing, a device fixing plate installed on the foundation for supporting the bearing sliding base, and the and a shock absorbing material interposed between the bearing slide and the device fixed plate.

Here, the contact surface of the sliding bearing is provided with a lubricating resin layer, the contact surface of the bearing slide is provided with a lubricating resin layer, and the contact surface of the sliding bearing is provided with the contact surface of the bearing slide. The device fixing plate is provided with a mounting recess, and the support sliding base is provided with a pair of movement restricting portions. It is attached to the mounting recess of the device fixed plate so as to straddle the mounting recess of the fixed plate, and the reciprocating movement of the bearing sliding base in a predetermined direction is controlled by the pair of movement restricting portions of the device fixed plate and/or Reciprocating movement of the support slide in a direction perpendicular to the predetermined direction is restricted by contact of the support slide with the wall surface of the mounting recess of the device fixing plate. The shock-absorbing material is elastically deformed in the vertical direction to absorb the vertical swaying caused by an earthquake, and the sliding bearings are capable of absorbing the vertical swaying caused by the earthquake. It is shown to dampen roll by moving relative to the
However, the shock consists of an upper device fixed to the base side, including a sliding bearing equipped with a mechanism for evenly transmitting loads and seismic forces, and a bearing slide and elastic body that creates a contact surface with the upper device. It was a complicated structure consisting of a lower device including a seismic isolation device fixed plate that was tightly fixed to the recess of the foundation with a cushioning material via an anchor material.

In addition, the mechanism to restore the relative movement caused by damping the rolling is controlled by an auxiliary device provided to complement the seismic isolation device (upper device and lower device), but the coil spring It depends on the elastic deformation and restoring force of the free stretchable material such as the base, and does not have a sufficient position adjustment function to return the displacement caused by the relative movement between the base and the foundation to the desired position.
Furthermore, the free stretchable material absorbs a part of the seismic energy and releases the energy by the return action. Since it is not designed to absorb all of the energy, there is a risk that the energy released by the auxiliary device will amplify the shaking caused by the earthquake.

JP 2013-174062 A

The problem of the present invention is to eliminate the shaking of the earthquake by absorbing the seismic energy by the relative movement of the foundation concrete and the base of the wooden structure due to slipping, for earthquakes with shaking within the assumption. A seismic isolation system equipped with a simple and inexpensive mechanism that avoids dangers such as damage to buildings and overturning of indoor furniture, and properly restores the gap between the foundation concrete and the foundation of a wooden structure caused by the absorption of earthquake energy. is to provide

In the first aspect of the present invention, a base isolation system for a wooden detached building mainly composed of foundation concrete provided on the ground and a wooden structure placed on the foundation concrete,
a) A slide for contacting and supporting the base of the wooden structure, comprising a height adjustment part detachably attached to the upper part of the foundation concrete to form a horizontal plane, and a sliding bearing member attached to the horizontal plane. a bearing structure;
b) a base position adjustment system including a mounting portion provided in advance on the side surface of the foundation concrete, and a displacement force transmission portion that abuts on the base and applies a horizontal displacement force using the mounting portion as a fulcrum,
including
By adjusting the coefficient of static friction between the parts involved in the contact support, in the event of an earthquake of a preset intensity or greater, the foundation slides on the bearing structure, causing a relative positional deviation to generate seismic energy. seismic isolation by absorbing
A system is provided in which the displacement caused by the seismic isolation is corrected by a horizontal displacement force due to the operation of the base position adjustment system.

If the coefficient of static friction is adjusted so that the strength at which the base starts to slide on the bearing structure is seismic intensity 4, a seismic isolation system can be used in the event of an earthquake that is strong enough to overturn objects such as indoor furniture. A slipping action occurs, absorbing the seismic energy and preventing damage due to overturning of objects.

The slide bearing member is preferably made of a resin having a coefficient of static friction with the base of 0.18 or more and 0.25 or less. No special processing is required for the lower surface of the foundation of the superstructure, and the coefficient of static friction between the base concrete and the timber that constitutes the foundation is adjusted only by processing the structure of the upper surface of the foundation concrete, which is the substructure. Easy.
If the coefficient of static friction is 0.18 or more, it is possible to suppress slippage even in winds of about 40 m/s caused by a strong typhoon, which is the term used by the Japan Meteorological Agency. In addition, even in an earthquake with a seismic intensity of about 7, which is assumed to be the maximum seismic isolation target for this system, seismic isolation can be performed within a range that does not damage housing-related facilities such as pipes and electric wires fixed to the foundation concrete. Hereinafter, this deviation range will be referred to as deviation tolerance.
If the coefficient of static friction is 0.25 or less, sliding occurs during a strong earthquake that may damage wooden detached buildings, and the seismic energy can be absorbed.
The resin may be at least one selected from polyvinyl chloride and polyethylene.

The position of the mounting portion may be the outer peripheral surface sandwiching the corner of the foundation concrete.
This is because the corner has sufficient strength to support the horizontal displacement force. In addition, it is a position that serves as a point of action that allows easy horizontal movement of the base position using another corner as a fulcrum of rotation.

When the movement distance of the displacement reaches a preset distance, a stopper having a shock absorbing portion that abuts on the side surface of the base concrete is installed on the base to restrict displacement exceeding the preset distance. , may be

FIG. 1 is a front view showing an outline of a wooden detached building in Example 1. FIG. FIG. 2 is a plan view showing the planar arrangement of the sliding support structure provided on the foundation concrete and the mounting portion of the base position adjusting device. FIG. 3 is a schematic perspective view showing the appearance of a sliding support structure provided on foundation concrete. FIG. 4 is a schematic cross-sectional view showing the attachment of the slide bearing structure to the foundation concrete. FIG. 5 is a plan view of the seismic isolation mount. FIG. 6 is a perspective view showing the positional relationship between the stopper, its attachment, and the foundation concrete. FIG. 7 is a front view and a side view of the stopper, with the contact surface of the shock absorbing rubber being the front. FIG. 8 is a diagram showing a base position adjusting system composed of a mounting portion provided in foundation concrete and a base position adjusting device. FIG. 9 is an image diagram showing the mounting of the base position adjusting device and the return operation of returning the base to its original position. FIG. 10 is a flow chart showing the process from the seismic isolation operation at the occurrence of an earthquake to the restoration of the displacement after the earthquake.

The examples shown below are examples of preferred embodiments of the present invention, and the present invention should not be construed as being limited thereto.

FIG. 1 is a front view showing an outline of a wooden detached building in Example 1. FIG.
A lower structure mainly composed of foundation concrete 1001 placed in the ground 1000 supports a wooden structure 1002 as an upper structure.
Here, a sliding bearing structure 1003 is provided on the upper portion of the foundation concrete 1001 , and the upper surface of the sliding bearing structure contacts and supports a seismic isolation frame 1004 below the wooden structure 1002 . The seismic isolation frame 1004 is composed of a base 1005 and a stopper 1006 attached to the base, and the bottom surface of the base 1005 is the contact-supported portion.

FIG. 2 is a plan view showing the planar arrangement of the sliding bearing structure 1003 provided on the foundation concrete 1001 and the mounting portion 2001 of the base position adjusting device.
Here, a square-type sliding bearing structure 1003A for contact-supporting the corner prism positions of the wooden structure 1002, rectangular-type sliding-bearing structures 1003B and 1003C for contacting and supporting the outer peripheral positions between the corners of the wooden structure 1002, and A square-type sliding bearing structure 1003D and a rectangular-type sliding bearing structure 1003E are arranged to contact and support the position of the inner pillar in the room.
Here, the square type refers to a slide bearing structure having a square planar top surface. Also, the rectangular type refers to a sliding support structure having a rectangular planar shape on the upper surface.
The planar shape of the sliding bearing structure in the present invention is not limited to the types and areas shown here. Depending on the position in the upper structure to be supported and the load applied to that position, different types of planar shapes such as circular and elliptical, and sliding support structures of the same type but different planar shapes can be appropriately adopted.

In addition, a mounting portion 2001 for a base position adjusting device is provided on the outer periphery sandwiching the corner of the foundation concrete. Here, as the mounting portion 2001, a total of 16 through-holes for mounting are provided in the base concrete, two on each of the outer peripheral surfaces on both sides of the four corners.
This is provided by embedding the vinyl chloride pipe, which will be the mounting portion 2001, and pouring concrete in the foundation work.

FIG. 3 is a schematic perspective view showing the appearance of the slide bearing structure provided on the foundation concrete 1001. As shown in FIG.
In the slide bearing structure 1003A, a slide bearing member 3001A that contacts and supports the corner portion of the seismic isolation frame is fixed to a height adjustment member 3002A. The height adjusting member 3002A has a horizontal portion for adjusting the height of the horizontal level of the concrete upper surface and a vertical portion for fixing the position. The vertical portion is fixed by tightening a bolt 3003A to a female screw of a bolt previously embedded in the outer peripheral side surface of the foundation concrete 1001 as a means for fixing the height adjusting member.
In this sliding bearing structure, when the foundation concrete is formed, the female screw bolt is processed to prevent it from coming off and is set in the form in advance. It is provided by pouring. The height adjustment member 3002A is not adhered to concrete and is made of metal having sufficient strength to maintain the horizontal level. The height adjustment member 3002A and the slide support member 3001A can be freely attached and detached by attaching and detaching the bolt 3003A and the sliding support member fixing bolt described later, thereby facilitating repair and improvement such as member replacement.

In the sliding bearing structure 1003B, a sliding bearing member 3001B that contacts and supports the portion between corners of the seismic isolation frame is fixed to a height adjusting member 3002B. The height adjusting member 3002B has a horizontal portion for adjusting the height of the horizontal level of the concrete upper surface and a vertical portion for fixing the position. The vertical portion is fixed by tightening a bolt 3003B to a female thread of a bolt previously embedded in the inner peripheral side surface of the base concrete 1001 in contact as a means for fixing the height adjusting member.
In this sliding support structure, when the foundation concrete is formed, the female screw bolt is processed to prevent it from falling off and set in the form in advance. It is provided by pouring. The height adjustment member 3002B is not adhered to concrete and is made of metal with sufficient strength to maintain the horizontal level. The height adjustment member 3002B and the sliding bearing member 3001B can be freely attached and detached by attaching and detaching the bolt 3003B and the sliding bearing member fixing bolt described later, thereby facilitating repair and improvement such as member replacement.

In the sliding bearing structure 1003C, a sliding bearing member 3001C that contacts and supports the portion between corners of the seismic isolation frame is fixed to a height adjustment member 3002C. The sliding bearing member 3001C is arranged in two sheets of the same size as the sliding bearing member 3001B in the longitudinal direction, thereby improving the ease of maintenance such as replacement.
The height adjusting member 3002C has a horizontal portion for adjusting the height of the horizontal level of the concrete upper surface and a vertical portion for fixing the position. The vertical portion is fixed by tightening a bolt 3003C to a female screw of a bolt previously embedded in the inner peripheral side surface of the base concrete 1001 in contact as a means for fixing the height adjusting member. Since the area is larger than that of 1003B, the fixing strength is increased by increasing the number of bolts and bolt female threads.
In this sliding support structure, when the foundation concrete is formed, the female screw bolt is processed to prevent it from falling off and set in the form in advance, and the concrete is placed on the form with the height adjustment member 3002C fixed by the bolt 3003C. It is provided by pouring. The height adjustment member 3002C is not adhered to concrete and is made of metal with sufficient strength to maintain the horizontal level. The height adjustment member 3002C and the sliding bearing member 3001C can be freely attached and detached by attaching and detaching the bolt 3003C and the sliding bearing member fixing bolt described later, thereby facilitating repair and improvement such as member replacement.

In the slide bearing structure 1003D, a slide bearing member 3001D that contacts and supports a portion that supports the inner column of the seismic isolation frame is fixed to a height adjustment member 3002D. The sliding bearing member 3001D and the height adjusting member 3002D are configured as a set facing each other so as to sandwich the rising portion of the foundation concrete 1001. As shown in FIG.
The height adjusting member 3002D has a horizontal portion for adjusting the height of the horizontal level of the concrete upper surface and a vertical portion for fixing the position. The vertical portion is fixed by tightening a bolt 3003D to a female thread of a bolt previously embedded as a height adjusting member fixing means in the opposing side surface of the rising portion of the foundation concrete.
In this sliding support structure, when the foundation concrete is formed, the female screw bolt is processed to prevent it from falling off and set in the form in advance, and the concrete is placed on the form with the height adjustment member 3002D fixed by the bolt 3003D. It is provided by pouring. The height adjustment member 3002D is not adhered to concrete and is made of metal with sufficient strength to maintain the horizontal level. The height adjustment member 3002D and the slide support member 3001D can be freely attached and detached by attaching and detaching the bolt 3003D and the sliding support member fixing bolt described later, thereby facilitating repair and improvement such as member replacement.

In the sliding bearing structure 1003E, a sliding bearing member 3001E that contacts and supports a portion that supports the inner column of the seismic isolation frame is fixed to a height adjustment member 3002E. The sliding support member 3001E and the height adjusting member 3002E are configured as a set facing each other so as to sandwich the rising portion of the foundation concrete 1001. As shown in FIG.
The sliding bearing member 3001E is configured by arranging a plurality of divided sliding bearing members in order to improve ease of maintenance such as replacement.
The height adjusting member 3002E has a horizontal portion for adjusting the height of the horizontal level of the concrete upper surface and a vertical portion for fixing the position. The vertical portion is fixed by tightening a bolt 3003E to a female screw of a bolt previously embedded as a height adjusting member fixing means in the opposing side surface of the rising portion of the foundation concrete. Since the area is larger than that of 1003D, the number of bolts and bolt female threads is increased to increase the fixing strength.
In this sliding support structure, when the foundation concrete is formed, the female screw bolt is processed to prevent it from falling off and set in the form in advance, and the concrete is placed on the form with the height adjustment member 3002D fixed by the bolt 3003D. It is provided by pouring. The height adjusting member 3002D is not adhered to concrete and is made of metal with sufficient strength to maintain the horizontal level. The height adjustment member 3002D and the slide support member 3001D can be freely attached and detached by attaching and detaching the bolt 3003D and the sliding support member fixing bolt described later, thereby facilitating repair and improvement such as member replacement.

FIG. 4 is a schematic cross-sectional view showing the attachment of the slide bearing structure to the foundation concrete.
4001 is a schematic cross section taken along a vertical plane including any bolt 3003A of the slide bearing structure 1003A. A horizontal portion 4004A of a height adjusting member 3002A that forms a horizontal plane is laminated on the upper surface of the foundation concrete 1001 .
A vertical portion 4005A of the height adjusting member 3002A is fixed by tightening a bolt 3003A to a female bolt thread 4006A embedded in the side surface of the foundation concrete 1001. As shown in FIG. A sliding bearing member 3001A is fixed to the upper surface of the horizontal portion 4004A by a sliding bearing member fixing bolt 4008A.
In placing the foundation concrete, the female bolt thread 4006A is provided with an anti-loosening process 4007A that forms a protruding edge at the tip, is fixed in advance at a predetermined position within the formwork, and a height adjusting member is attached to the female thread of the bolt. By adopting the process of pouring concrete into the formwork while it is assembled with bolts 3003A, the accuracy of the horizontal level and surface uniformity of the slide bearing structure 1003A can be improved, and the coefficient of static friction can be easily adjusted. .

4002 is a schematic cross-section taken along a vertical plane including either bolt 3003B of the slide bearing structure 1003B. A horizontal portion 4004B of a height adjusting member 3002B forming a horizontal plane is layered on the upper surface of the foundation concrete 1001 .
A vertical portion 4005B of the height adjusting member 3002B is fixed by tightening a bolt 3003B to a female bolt thread 4006B embedded in the side surface of the base concrete 1001. As shown in FIG. A sliding bearing member 3001B is fixed to the upper surface of the horizontal portion 4004B by a sliding bearing member fixing bolt 4008B.
In placing the foundation concrete, the female bolt thread 4006B is provided with an anti-loosening process 4007B that forms a protruding edge at the tip, is fixed in advance at a predetermined position in the formwork, and a height adjusting member is attached to the female thread of the bolt. By adopting the process of pouring concrete into the formwork while assembled with bolts 3003B, the accuracy of the horizontal level and surface uniformity of the slide bearing structure 1003B is improved, and the coefficient of static friction can be easily adjusted.
A schematic cross-section of the slide bearing structure 1003C taken along a vertical plane including any bolt 3003C is the same as that of the slide bearing structure 1003B, and is therefore omitted.

4003 is a schematic cross-section taken along a vertical plane including either bolt 3003D of the slide bearing structure 1003D. A horizontal portion 4004D of a height adjusting member 3002D forming a horizontal plane is layered on the upper surface of the foundation concrete 1001 .
A vertical portion 4005D of the height adjusting member 3002D is fixed by tightening a bolt 3003D to a female bolt thread 4006D embedded in the side surface of the foundation concrete 1001. As shown in FIG. A sliding bearing member 3001D is fixed to the upper surface of the horizontal portion 4004D by a sliding bearing member fixing bolt 4008D.
In placing the foundation concrete, the bolt female thread 4006D is provided with an anti-loosening process 4007D that forms a protruded edge at the tip, is fixed in advance at a predetermined position in the formwork, and a height adjusting member is attached to the bolt female thread. By adopting the process of pouring concrete into the formwork while assembled with bolts 3003D, it is possible to improve the accuracy of the horizontal level and surface uniformity of the slide bearing structure 1003D and to easily adjust the coefficient of static friction.
A schematic cross-section of the sliding bearing structure 1003E taken along a vertical plane including any bolt 3003E is the same as that of the sliding bearing structure 1003D, and is therefore omitted.

The sliding bearing members 1003A, 1003B, 1003C, 1003D and 1003E are flat plates made of resin having a static friction coefficient of 0.18 or more and 0.25 or less with the crosspieces constituting the seismic isolation frame.
By adopting sliding bearings made of such materials, they do not move in winds of about 40 meters per hour, which is assumed in a strong typhoon according to the standards of the Japan Meteorological Agency. Frictional forces can be adjusted to absorb that energy. The allowable deviation range of housing equipment that requires connection between the upper structure and the lower structure such as piping is about 200 mm, and by adopting the above resin, the frictional force can be adjusted according to the allowable deviation range. Hereinafter, the range of misalignment that does not damage housing-related facilities such as pipes and electric wires fixed to the foundation concrete is referred to as the permissible misalignment range.
Here, resins such as polyvinyl chloride and polyethylene can be used as the material of the slide bearing material capable of adjusting the frictional force as described above.

FIG. 5 is a plan view of the seismic isolation frame 1004. FIG.
The seismic isolation frame 1004 is composed of a base 5001 and a stopper. The base 5001 is assembled by assembling wooden pieces as crosspieces, and is erected with pillars to constitute the bottom of the wooden structure 1002 . A position indicated by a dashed circle indicates a stopper installation position 5002 .

FIG. 6 is a perspective view showing the positional relationship between the stopper, its attachment, and the foundation concrete. Here, in order to explain the vertical positional relationship between the cross section of the foundation concrete and the cross section of the stopper, they are drawn on the same plane, ignoring the front-rear relationship.
The stopper 6001 is fixed to a stopper installation position 5002 of the base 5001 with a fixing member 6002 . The impact absorbing rubber 6003 fixed to the fixing member by the bolt 6004 is adjusted so that its contact surface 6005 is positioned 200 mm from the inner surface 6007 directly below the sliding bearing structure 6006 of the foundation concrete. By adjusting in this way, if the seismic energy cannot be completely absorbed by a shift of 200 mm, the shift is restricted by the stopper.
Here, the position of the abutment surface 6005 was adjusted to 200 mm from the inner surface of the foundation concrete, but it can be changed as appropriate according to the allowable deviation range of housing equipment that requires connection between the upper structure such as piping and the lower structure.

FIG. 7 is a front view and a side view of the stopper, with the contact surface 6005 of the shock absorbing rubber 6003 as the front. 7001 is a side view and 7002 is a front view. The fixing member 6002 is composed of a base mounting portion 7003 and a shock absorbing rubber mounting portion 7004 .
The base mounting portion 7003 has a structure in which a crosspiece constituting the base is sandwiched between them and fixed to the crosspiece at the stopper installation position 5002 with a bolt or the like.
As shown in front view 7002 , impact absorbing rubber 6003 is fixed to impact absorbing rubber attachment portion 7004 with a plurality of bolts 6004 .

FIG. 8 is a diagram showing a base position adjusting system composed of a mounting portion 2001 provided on a foundation concrete 1001 and a base position adjusting device.
8001A shows a side surface of the base position adjusting device when the contact surface of the piston with respect to the base is taken as the front, and 8001B is a front view.
The base position adjusting devices 8001A and 8001B are composed of a displacement force holding plate 8002, a fixed arm 8004 having a hook 8003, a fixed base 8005, and a displacement force generating portion 8006 having a displacement force transmission portion 8007.
In the base position adjusting device employed here, the displacement force generating portion 8006 is the jack body, and the displacement force transmitting portion 8007 is the piston of the jack. It is possible to adopt.
The base position adjusting device is used by attaching a fixed arm 8004 to the mounting portion 2001 in order to return the base 1005 to its original position after occurrence of displacement.

FIG. 9 is an image diagram showing the mounting of the base position adjusting device and the return operation of returning the base to its original position.
9001 is an image immediately after installation of the base position adjusting device. A person who adjusts the base position penetrates the fixing arm 8004 through the mounting through-hole which becomes the mounting portion 2001, and the hook 8003 is fixed to the outlet of the hole. The piston 8007 is retracted into the jack body before transmitting the displacement force.
9002 is an image of the base position adjusting device immediately after the return is completed. A displacement force generated by the jack is transmitted from the piston 8007 to the base 1005 so that the position of the base 1005 can be adjusted and returned to its original position.
A fixed arm 8004 of the base position adjusting device is attached to the attachment portion on the side surface of the foundation concrete outer circumference sandwiching the corner where there is a protrusion due to displacement, and the displacement force is transmitted from the piston to the base. Since the displacement force is a leveraged force with a rotation fulcrum at an angle different from the part where the piston abuts, it is possible to generate a large displacement force with a small amount of force, and fine adjustment of the positional movement is easy. .
By adopting a base position adjusting system composed of a device having a simple configuration and a mounting portion provided in advance on the foundation concrete, it is possible to realize a function of restoring the displacement at a low cost.
Here, the through-hole for attachment, which becomes the attachment portion 2001, can be easily formed by pouring concrete in a state in which a pipe made of a resin such as vinyl chloride is fixed at the position of the attachment portion in the formwork when placing the foundation concrete. can be provided.

FIG. 10 is a flow chart showing the process from seismic isolation operation at the occurrence of an earthquake to restoration of the displacement after the earthquake.
The earthquake occurrence step 10001 is the stage when an earthquake occurs and the shaking reaches the wooden detached building adopting this system.
If the earthquake is not so strong as to generate a displacement force exceeding the frictional force, a step without displacement occurs as indicated by 10002, and the seismic isolation operation corresponding to the earthquake does not occur. If the earthquake is strong, it goes to the shift operation step 10003, and the absorption of seismic energy occurs due to the shift operation by the sliding support structure.
In the case of a sway with an expected strength, an energy absorption step 10004 is reached, in which the seismic energy is absorbed by the slip movement, and the slip motion is stopped. In the event that the displacement exceeds the design assumption, the displacement is regulated by the contact between the stopper and the foundation concrete as shown in step 10005 .
Here, the seismic energy that could not be absorbed due to the deviation within the allowable range is absorbed by the collision between the impact-absorbing rubber of the stopper and the foundation concrete.
In a shift return step 10006, the shift caused by absorbing the seismic energy in step 10004 or step 10005 is returned to the original position by the foundation position adjustment system. The return action by the base positioning system is as previously described.

By adopting the seismic isolation system described above, earthquakes of expected strength can be absorbed by the relative movement of the foundation concrete and the base of the wooden structure due to slippage. sway can be eliminated. By exhibiting an effect that can be called a "vibration isolation" effect, it becomes possible to avoid dangers such as damage to wooden detached buildings and overturning of indoor furniture.
In addition, it is possible to regulate the displacement that damages the housing equipment that has fixed parts with the foundation concrete even in the event of an earthquake that causes displacement that exceeds assumptions.
Furthermore, it is possible to provide a mechanism for appropriately correcting the deviation between the foundation concrete and the foundation of the wooden structure caused by the absorption of seismic energy.
A seismic isolation system having these functions can be supplied at a low cost with a simpler configuration than a conventional seismic isolation system having a complicated configuration.

It can be used in the construction industry and the housing sales industry that construct and sell wooden detached buildings such as houses equipped with seismic isolation systems.

1001 Foundation concrete 1002 Wooden structure 1003 Sliding bearing structure 1004 Seismic isolation frame 1005 Foundation 1006 Stopper

Claims (5)

A seismic isolation system for a wooden detached building mainly composed of foundation concrete provided on the ground and a wooden structure placed on the foundation concrete,
a) A slide for contacting and supporting the base of the wooden structure, comprising a height adjustment part detachably attached to the upper part of the foundation concrete to form a horizontal plane, and a sliding bearing member attached to the horizontal plane. a bearing structure;
b) a base position adjustment system including a mounting portion provided in advance on the side surface of the foundation concrete, and a displacement force transmission portion that abuts on the base and applies a horizontal displacement force using the mounting portion as a fulcrum;
including
By adjusting the coefficient of static friction between the parts involved in the contact support, the foundation slides on the bearing structure in the event of an earthquake of a preset intensity or more, causing a relative positional deviation to generate seismic energy. seismic isolation by absorbing
A system characterized in that the displacement caused by the seismic isolation is corrected by a horizontal displacement force caused by the operation of the base position adjustment system. 2. The system according to claim 1, wherein the sliding bearing member is made of resin having a coefficient of static friction with the base of 0.18 or more and 0.25 or less. 3. The system according to claim 2, wherein said resin is at least one selected from polyvinyl chloride and polyethylene. 2. The system according to claim 1, wherein the position of the attachment part is the outer peripheral surface sandwiching the corner of the foundation concrete. When the movement distance of the displacement reaches a preset distance, a stopper having a shock absorbing portion that abuts on the side surface of the base concrete is installed on the base to restrict displacement exceeding the preset distance. 2. The system of claim 1, wherein:

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