JP5357911B2 - Base isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic isolated foundation structure capable of being easily and inexpensively designed and constructed. <P>SOLUTION: In the seismic isolated foundation structure G, an upper foundation packing 5 fixed to a base ta is superposed on a lower foundation packing 4 fixed to a foundation H so that both the foundation packings slide on each other's contact surface, thereby consuming earthquake energy when an earthquake occurs. By this, quake transmitted to a wooden building T can be alleviated. In addition, an anchor bolt 3 embedded in the foundation H and a buffer body 7 attached to the building T are connected via a connecting member 8 so as to restrain the upper foundation packing 5 from moving and convert horizontal quake into vertical quake, thereby absorbing the horizontal quake. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a base isolation structure for a building.

  In Japan, where there are many earthquakes, various researches and developments have been conducted on the basic structures of buildings with seismic isolation functions. For example, Patent Document 1 discloses a seismic isolation device composed of a frame in which steel materials are assembled in a lattice shape, a base and a moving support unit having a rolling support interposed between the frame and a plurality of such seismic isolation devices. The invention of the seismic isolated base structure is described. The present invention reduces the vibration transmitted to the building by absorbing the vibration of the earthquake (earthquake energy) with the rolling bearing. In addition, an invention is described in which a rolling support and a fixed portion (for example, the ground) are connected by a damper or the like, thereby increasing the horizontal shaking absorption effect.

JP-A-4-315650 (FIG. 1)

However, the invention according to Patent Document 1 must be provided with a solid frame that can withstand building loads and earthquake shaking, and the design and construction of this frame is complicated and increases the construction cost. It was.
This invention is made | formed in order to solve this subject, and makes it a subject to provide the seismic isolation base structure which is easy to design and construct and can be constructed at low cost.

  The invention devised to solve such a problem is a seismic isolation foundation structure having a foundation, a building, and a plurality of foundation packings interposed between the foundation and the building. The foundation packing includes a lower foundation packing fixed to an upper end of the foundation and an upper foundation packing fixed to a lower end of a lower member of the building, and an upper surface of the lower foundation packing. Are formed with a plurality of flat concave inclined surfaces that are inclined substantially downward from the outer edge side of the lower basic packing, and the lower edge of the upper basic packing is formed on the outer edge of the upper basic packing. A plurality of flat convex inclined surfaces that are inclined substantially downward from the side are formed, and the concave inclined surface and the convex inclined surface are in surface contact with each other when horizontal shaking occurs. Characterized by sliding .

According to this invention, since the lower foundation packing fixed to the foundation and the upper foundation packing fixed to the building are slidably contacted, when an earthquake occurs, both foundation packings slide. Thereby, since earthquake energy is consumed, the vibration transmitted to the building can be reduced. In addition, unlike the prior art, it is not necessary to install a gantry and only two basic packings are overlapped, so that design and construction can be performed relatively easily and inexpensively.
Moreover, according to this invention, when an earthquake occurs, since the base packing which carried out surface contact slides on an inclined surface, earthquake energy is consumed and a shake can be reduced. Furthermore, the upper basic packing that has slid along the concave inclined surface can be smoothly restored to the original position along the concave inclined surface by the weight of the building.
In addition, the lower member in this invention means the member concerning the lower end of a building. In addition, when a foundation is provided on the foundation, the foundation is included in the concept of the building. That is, when a base is provided, the lower member including the base and the lower frame material is referred to as a lower member.

The invention according to claim 2, concave inclined surface formed on an upper surface of the lower underlying packing, a pair of planes inclined toward the substantially central downward from an outer edge portion side opposite of the lower underlying packing The convex inclined surface formed on the lower surface of the upper basic packing is formed of a pair of planes inclined substantially downward from the outer edge side of the upper basic packing facing the center. said base packing are pieces interposed, a set of basic packing with the concave inclined surface and said protrusion inclined surface inclined to one direction, the recess slope inclined in the other direction orthogonal to the prior SL direction And a set of the foundation packing having the surface and the convex inclined surface.

  According to a third aspect of the present invention, there is provided a recessed groove portion provided on the upper surface of the lower basic packing so as to be recessed from the outer edge portion and formed larger than the width of the upper basic packing, It has a gap formed by fitting the upper base packing, and a damping material installed in the gap.

  According to this invention, when an earthquake occurs and the upper foundation packing slides, the seismic energy is absorbed by the damping material, so that the shaking of the earthquake can be further reduced.

  According to a fourth aspect of the present invention, the anchor bolt embedded in the foundation, the shock absorber installed at the upper end of the lower member, the lower foundation packing, the upper foundation packing, and the lower member are penetrated. It has a connecting member inserted through a through hole and connecting the anchor bolt and the buffer.

  According to this invention, in order to connect the anchor bolt embedded in the foundation and the shock absorber installed in the lower member via the connecting member, when the lower base packing and the upper base packing slide, the connecting member Is pulled and the buffer is compressed. That is, since the seismic energy is used and absorbed by the compression action of the buffer, the vibration can be further reduced.

  According to the present invention, since the shaking of an earthquake can be reduced by overlapping two base packings and sliding them, the seismic isolation base structure is designed and constructed easily and inexpensively. be able to.

It is the perspective view which showed the seismic isolation basic structure which concerns on 1st embodiment. It is the figure which showed the seismic isolation apparatus which concerns on 1st embodiment, Comprising: (a) is a perspective view, (b) is the perspective view which showed the foundation packing. It is the perspective view which showed the operation state of the seismic isolation apparatus which concerns on 1st embodiment. It is the figure which showed the seismic isolation apparatus which concerns on 2nd embodiment, Comprising: (a) is sectional drawing of a seismic isolation apparatus, (b) is a top view of a seismic isolation apparatus. It is the figure which showed the seismic isolation apparatus which concerns on a reference example, Comprising: (a) is sectional drawing of a seismic isolation apparatus, (b) is a top view of a seismic isolation apparatus. It is the figure which showed the modification of the foundation packing, Comprising: (a) is a reference example, (b) is 3rd embodiment, (c) is the perspective view which showed the reference example.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing the base isolation structure according to the first embodiment. 2A and 2B are diagrams illustrating the seismic isolation device according to the first embodiment, in which FIG. 2A is a perspective view, and FIG. 2B is a perspective view illustrating a basic packing of the seismic isolation device. FIG. 3 is an enlarged perspective view showing an operating state of the seismic isolation device when an earthquake occurs. In the description of the embodiment, the vertical and horizontal directions follow the arrows in FIG.

[First embodiment]
The seismic isolation foundation structure G according to the first embodiment includes a rectangular foundation H, a building T constructed above the foundation H, and a substantially equal interval between the foundation H and the building T. The seismic isolation devices 1, 1... And the seismic isolation devices 1 ′, 1 ′. In this embodiment, the building T is, for example, a house constructed by a frame wall construction method, and a wall frame E having a floor plywood tb, a lower frame material tc, and wall surface materials td and td at the upper end of the base ta. It will be installed. In the present embodiment, a wooden building T will be described as an example. However, the present invention is not limited to a wooden building, and may be a steel frame building or the like.
Hereinafter, the structure of the seismic isolation device 1 will be described in detail.

  The foundation H fixes the building T to the ground and transmits the force acting on the building T to the ground to maintain stability. As shown in FIG. 1, the foundation H is a cloth foundation made of reinforced concrete in the first embodiment. In the first embodiment, the fabric H is used as the foundation H. However, the foundation H is not limited to this and may be another kind of foundation.

  The lower member t is a member located at the lower end of the building T as shown in FIG. 1 and FIG. That is, in the first embodiment, the lower member t refers to the base ta, the floor plywood tb, and the lower frame material tc.

The foundation ta is used as a horizontal member that supports the lower part of the building T. As shown in FIGS. 1 and 2, the base ta is interposed between the upper foundation packing 5 and the floor plywood tb.
As shown in FIGS. 1 and 2A, the lower frame member tc is a member applied to the lower end of the wall set E, and is installed on the upper surface of the floor plywood tb. The base ta, the floor plywood tb, and the lower frame material tc are each provided with a through hole 9 through which a connecting member 8 described later is inserted.

  As shown in FIG. 2A, the seismic isolation device 1 according to the first embodiment is an anchor bolt 3 embedded in the foundation H, a foundation packing P, and a lower member that is a member related to the lower end of the building T. t, a buffer body 7 installed at the upper end of the lower member t, and a connecting member 8 that connects the anchor bolt 3 and the buffer body 7.

  The anchor bolt 3 fixes the foundation H and the building T (lower member t) in the vertical direction by using a buffer 7 and a connecting member 8 which will be described later. In the first embodiment, the anchor bolt 3 is embedded up to the upper end of the foundation H as shown in FIGS. 1 and 2. Usually, as a method for fixing the foundation and the foundation, a method is used in which the foundation is penetrated by an anchor bolt embedded in the foundation and protruding above the foundation, and the foundation is fixed with a washer and a nut. However, in the first embodiment, since the foundation H and the building T (lower member t) are fixed in the vertical direction using the buffer body 7 and the connecting member 8 that connects the buffer body 7 and the anchor bolt 3 described later, the anchor The bolt 7 that is embedded up to the upper end of the foundation H is used.

  As shown in FIG. 2 (a), the foundation packing P is composed of a lower foundation packing 4 and an upper foundation packing 5, and is interposed between the foundation H and the building T, with a gap between the foundation H and the base ta. By providing this, the ventilation under the floor is improved. Furthermore, when vibration occurs, the seismic energy is consumed by sliding on the contact surfaces of the lower base packing 4 and the upper base packing 5.

  As shown in FIGS. 2A and 2B, the lower foundation packing 4 has a width substantially equal to that of the foundation H, and is fixed to the upper end of the foundation H. The lower base packing 4 has concave inclined surfaces 10 and 10 that are recessed from both outer edge portions M and M substantially downward toward the center.

  As shown in FIGS. 2A and 2B, the upper base packing 5 has a width substantially equal to the base ta and is fixed to the lower end of the base ta. The upper basic packing 5 has convex inclined surfaces 11 and 11 projecting from both outer edge portions N and N (see FIG. 2B) substantially downward in the center. A through hole 9 through which a connecting member 8 to be described later passes is provided at the approximate center of the lower base packing 4 and the upper base packing 5.

  The concave inclined surface 10 and the convex inclined surface 11 have substantially the same inclination angle α as shown in FIG. 2B, and in the stationary state, the concave inclined surface 10 and the convex inclined surface 11 It is formed so that all surfaces are in surface contact. As a result, the upper foundation packing 5 can maintain a stable stationary state at the center of the lower foundation packing 4. In the first embodiment, the inclination angles α of the concave inclined surface 10 and the convex inclined surface 11 are both about 10 °.

  In the first embodiment, the lower foundation packing 4 and the foundation H and the upper foundation packing 5 and the base ta are fixed using a fastener (not shown) such as a screw. The head of the fastener is buried with a groove (not shown) so as not to protrude from the surfaces of the concave inclined surface 10 and the convex inclined surface 11.

  In the first embodiment, since the width of the lower foundation packing 4 is larger than the width of the upper foundation packing 5, the upper foundation packing 5 is positioned on the lower side even when a vibration occurs. It is formed so that it is difficult to drop off from the base packing 4.

  The manufacturing method of the lower base packing 4 and the upper base packing 5 is manufactured by injection molding in the first embodiment, but is not limited to this, and may be another manufacturing method. In addition, the inclination angle α of the inclination of the concave inclined surface 10 and the convex inclined surface 11 may be appropriately set according to the load of the building T and the assumed level of the earthquake in consideration of the slidability and the recoverability. . Although the inclination angle α is about 10 ° in the first embodiment, the inclination angle is preferably 0 to 20 °.

In the first embodiment, the lower foundation packing 4 and the foundation H, and the upper foundation packing 5 and the base ta are fixed using fasteners. However, the present invention is not limited to this. For example, an epoxy resin You may fix using an adhesive agent. Moreover, you may fix using both an adhesive agent and a fastener.
The basic packing P in the first embodiment is made of resin, but is not limited to this, and may be other materials. The base packing P is preferably a material having a low friction coefficient because the lower base packing 4 and the upper base packing 5 slide in surface contact with each other.

  The shock absorber 7 absorbs seismic energy in the horizontal direction in the vertical direction by being compressed through a connecting member 8 described later. As shown in FIG. 2A, the buffer body 7 is installed on the vertical line of the anchor bolt 3 and at the upper end of the lower frame member tc. In the first embodiment, the shock absorber 7 is made of urethane foam, is sandwiched by sandwiching plates K and K, and is coupled to a connecting member 8 described later by a bolt J. In the present embodiment, the buffer body 7 is housed in the wall set E by two wall surface materials td and td (see FIG. 1) installed at both ends of the lower frame material tc. The upper landscape is not damaged.

  The shock absorber 7 is not limited to urethane foam, and for example, an elastically deformable member such as a spring, rubber, damper, or foamed resin may be used. Conventionally, hydraulic dampers, shock absorbers, and the like have been used as means for absorbing vibration, leading to an increase in the size of the device and an increase in construction costs. Can be constructed. Further, in the present embodiment, the buffer body 7 is arranged as described above, but is not limited thereto. For example, the buffer body 7 is cut through the upper portion of the base ta or the lower frame material tc. It may be buried.

Further, in the present embodiment, the sandwiching plate K related to the upper portion of the buffer body 7 is a disc having a single thickness, but the present invention is not limited to this. The sandwiching plate K related to the upper portion of the buffer body 7 is, for example, continuously narrow in the downward direction (conical frustum shape) or intermittently narrow (a shape in which discs are stacked), and is swayed. You may form so that it may sink into the buffer body 7 as it becomes large. Thereby, since the pressure receiving area of the clamping plate K with respect to the buffer material 7 changes depending on the magnitude of the shaking, for example, even if a small shaking occurs, the cushioning body 7 absorbs the shaking and restores the building T. be able to.
Further, the buffer body 7 and the connecting member 8 may be directly connected without using the clamping plate K.

The connecting member 8 connects the anchor bolt 3 and the buffer body 7. The connecting member 8 normally fixes each member of the foundation H, the foundation packing P, and the lower member t in the vertical direction. On the other hand, at the time of an earthquake, the connecting member 8 is pulled left and right by the upper base packing 5 to be deformed, thereby compressing the buffer body 7 and allowing the base packing P to slide within a predetermined range. .
In the first embodiment, as shown in FIG. 2, the connecting member 8 is inserted into the through hole 9 that penetrates the base packing P and the lower member t, and the anchor bolt 3 and the buffer 7 are connected. In the first embodiment, as shown in FIG. 2A, the connecting member 8 has one end joined to the upper end of the anchor bolt 3 by welding and the other end screwed by the bolt J to provide a shock absorber. 7 is joined.
The connecting member 8 preferably has a high vertical tensile strength and deforms in the horizontal direction. The connection member 8 in the first embodiment uses a steel wire, but is not limited to this, and other materials may be used. Moreover, the upper end of the anchor bolt 3 and the connecting member 8 may be joined by a known joining method other than welding.
The through hole 9 is a hole through which the connecting member 8 is inserted. The connecting member 8 is formed so as to be larger than the diameter of the connecting member 8 as shown in FIG. The shape of the through hole 9 is a cylindrical shape in the first embodiment, but may be another shape.

Next, the operation of the seismic isolation device 1 will be described when an earthquake occurs.
As shown in FIG. 3, when shaking occurs on the right side in the horizontal direction (arrow 20), the upper base packing 5 slides on the concave inclined surface 10 and moves to the right side from the center. At this time, the connecting member 8 is also pulled to the right side, and the buffer body 7 is compressed as much as the connecting member 8 is pulled (arrow 21). That is, horizontal shaking (earthquake energy) is absorbed by compressing the buffer 7 in the vertical direction. When the shaking is settled, the building T smoothly returns to the state shown in FIG. 2A along the inclination of the concave inclined surface 10 and the convex inclined surface 11 due to its own weight.

Here, as indicated by an arrow F in FIG. 2A, the inclination direction of the concave inclined surface 10 and the convex inclined surface 11 is defined as F.
As shown in FIG. 2B, the concave inclined surface 10 and the convex inclined surface 11 according to the seismic isolation device 1 are formed from two inclined surfaces that are inclined downward from the outer edge portions M and N toward the center. Therefore, for example, when a swing in the left-right direction (inclination direction F) occurs, the original position can be restored along the concave inclined surface 10 and the convex inclined surface 11. However, for example, when a shaking in the front-rear direction occurs, it cannot be restored to the original position with one seismic isolation device.
Therefore, in the first embodiment, as shown in FIG. 1, by using a plurality of seismic isolation devices 1, 1... The seismic isolation base structure G is constructed so that the building T can be restored to the original position against the shaking in the front-rear direction. If the seismic isolation device 1 can flexibly cope with shaking in the left-right direction, the front-rear direction, and the oblique direction, the shape (inclination direction F), the arrangement direction, the arrangement position, the number of arrangements, etc. of the foundation packing P may be appropriately set Good.

  As explained above, according to the seismic isolation device 1 of the first embodiment of the present invention, the lower base packing 4 fixed to the foundation H and the upper base packing 5 fixed to the lower member t are overlapped. Therefore, when an earthquake occurs, both basic packings P slide on the contact surface, and the earthquake energy is consumed. Thereby, the vibration transmitted to the building T can be reduced. Moreover, since the anchor bolt 3 embedded in the foundation H and the buffer body 7 installed in the lower member t are connected via the connecting member 8, the earthquake energy is absorbed by compressing the buffer body 7. The Thereby, the shake by the earthquake transmitted to the building T can be reduced more. Moreover, since it is not necessary to install a pedestal as in the prior art, design and construction can be performed relatively easily and inexpensively.

  Moreover, since the foundation packing P has the recessed part inclined surface 10 and the convex part inclined surface 11 which incline toward the center downward direction, even if an earthquake generate | occur | produces and the building T moves, the building T is the recessed part inclined surface 10 by dead weight. Can be restored to the original position smoothly.

In addition, in the prior art, the height of the floor surface is increased by about 20 cm to 60 cm from the normal level due to the installation of the gantry and the rolling support. However, according to the first embodiment, since only two foundation packings are overlapped, an increase in the height of the floor surface can be suppressed.
In the prior art, when the building T is renovated, the structure of the gantry must be taken into consideration, and the content of the renovation is restricted. However, according to the first embodiment, since no pedestal is provided, renovation can be performed without receiving such restrictions.

  In addition, although the structure of the seismic isolation apparatus 1 was demonstrated above, as shown in FIG. 1, you may construct the base isolation structure G combining the seismic isolation apparatus 1 and the seismic isolation apparatus 1 '. As shown in FIG. 1, the seismic isolation device 1 ′ includes only the lower base packing 4 and the upper base packing 5, and when an earthquake occurs, both are slid to consume earthquake energy. . That is, like the seismic isolation device 1 ′, the anchor bolt 3, the connecting member 8, etc. (see FIG. 2) do not necessarily need to be provided in the vertical direction. The detailed configuration of the seismic isolation device 1 ′ is substantially the same as that of the seismic isolation device 1, and is therefore omitted.

  As mentioned above, although the best embodiment of the seismic isolation apparatus 1 of this invention was described in detail, in the range which is not contrary to the meaning of this invention, it can change suitably. Other embodiments of the present invention are described below. In addition, about the member same as 1st embodiment, the same code | symbol shall be attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 4 is a diagram illustrating the seismic isolation device according to the second embodiment, in which (a) is a cross-sectional view of the seismic isolation device, and (b) is a plan view of the seismic isolation device. 5A and 5B are diagrams illustrating a seismic isolation device according to a reference example, in which FIG. 5A is a cross-sectional view of the seismic isolation device, and FIG. 5B is a plan view of the seismic isolation device. FIG. 6 is a view showing a modification of the base packing, in which (a) is a reference example, (b) is a third embodiment, and (c) is a perspective view showing a reference example.

[Second Embodiment]
As shown in FIG. 4, the seismic isolation device 31 according to the second embodiment is characterized in that the damping material 12 is installed. That is, the lower base packing 13 is formed by the concave inclined surfaces 10, 10, the outer peripheral portion 17 protruding from the outer edge portion M of the lower basic packing 13, and the concave inclined surface 10 and the outer peripheral portion 17. The groove portion 15 is formed. The recessed groove portion 15 is formed with a larger width than the upper basic packing 14. Thus, when the lower foundation packing 13 and the upper foundation packing 14 are fitted, a gap 16 is formed, and the damping material 12 is installed in the gap 16. The gap 16 is formed so as to surround the outer periphery of the upper base packing 14 as shown in FIG. In the second embodiment, the damping material 12 uses, for example, a foamed resin.

According to the second embodiment, the damping material 12 can suppress the movement of the upper foundation packing 14 and reduce the vibration transmitted to the building T, regardless of which direction of vibration occurs.
In addition, although the foaming resin is used for the damping material 12 in 2nd embodiment, it is not limited to this, For example, natural rubber, synthetic rubber, urethane, etc. should just be a material which can absorb vibration. Further, the buffer body 7 and the damping material 12 may be the same material.

[Reference example]
As shown in FIG. 5, the seismic isolation device 41 according to the reference example is characterized in that the damping material 12 is used and the contact surface between the lower base packing 42 and the upper base packing 43 is flat.
The seismic isolation device 41 includes a foundation H, a lower foundation packing 42, an upper foundation packing 43, a base ta, an anchor bolt 3 embedded in the foundation H, and a connecting member 8 that connects the anchor bolt 3 and the buffer material 7. The buffer material 7 is formed in a plate shape with a hole in the center, and is joined to the connecting member 8 by a washer 46 and a nut 47. The buffer body 7, the washer 46, and the nut 47 are embedded in a space that penetrates the upper end of the base ta.
Further, as shown in FIGS. 5A and 5B, the lower base packing 42 is formed with a concave groove 48 formed larger than the width of the upper base packing 43, and the lower base packing 42 The damping material 12 is installed in the gap 49 formed on the outer periphery of the upper base packing 43 by fitting 42 and the upper base packing 43 together.

Thereby, since the damping material 12 is installed in the outer periphery of the upper side foundation packing 43, the seismic isolation apparatus 41 can reduce the vibration transmitted to the building T with respect to the vibration in any direction.
In addition, since the anchor bolt 3 embedded in the foundation H and the buffer body 7 installed on the base ta are connected via the connecting member 8, the buffer body 7 is compressed with horizontal shaking (seismic energy). Therefore, the vibration transmitted to the building T can be further reduced.

[Reference example]
As shown in FIG. 6A, the seismic isolation device 71 according to the reference example has a lower basic packing 74 that is circular in plan view and has a bowl shape, and an upper basic packing 75 that protrudes downward and has a conical shape. (Basic packing P1) is used.

[Third embodiment]
In addition, as shown in FIG. 6B, the seismic isolation device 81 according to the third embodiment has a rectangular shape in plan view, and an upper foundation packing 85 that protrudes downward in a quadrangular pyramid shape, and an upper foundation. The lower base packing 84 (base packing P2) in surface contact with the packing 85 is used.

[Reference example]
In addition, as shown in FIG. 6C, the seismic isolation device 91 according to the reference example includes a lower base packing 94 that is circular in plan view and has a bowl shape, and an upper base packing that is spherical and protrudes downward. 95 (basic packing P3) is used.

According to basic packing P _2, it is possible to restore to the original position with respect to swing in all directions, without considering the inclination direction F of the basic packing P (see FIG. 1), it may be applied.

  Moreover, although the seismic isolation base structure G which concerns on 1st embodiment comprised from the seismic isolation apparatus 1,1 ... and the seismic isolation apparatus 1 ', 1' ..., it is not limited to this, The seismic isolation base structure G may be configured from one type of seismic isolation device, or may be configured by appropriately combining three or more types of seismic isolation devices.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 3 Anchor bolt 4 Lower side foundation packing 5 Upper side foundation packing 7 Cushioning body 8 Connection member 9 Through-hole 10 Concave inclined surface 11 Convex inclined surface 12 Damping material 15 Concave groove 16 Gap H foundation G Seismic isolation base structure M Outer edge N Outer edge T Wooden building t Lower member ta Foundation tb Floor plywood tc Lower frame material

Claims (4)

A base-isolated base structure having a foundation, a building, and a plurality of foundation packings that are interposed between the foundation and the building and stacked one above the other.
The basic packing is
A lower foundation packing fixed to the upper end of the foundation;
It is composed of an upper foundation packing fixed to the lower end of the lower member of the building,
On the upper surface of the lower basic packing, a plurality of flat concave inclined surfaces that are inclined substantially downward from the outer edge side of the lower basic packing are formed.
On the lower surface of the upper base packing, a plurality of flat convex inclined surfaces that are inclined substantially downward from the outer edge side of the upper basic packing are formed,
A seismic isolation foundation structure, wherein the concave inclined surface and the convex inclined surface slide while in surface contact when horizontal shaking occurs. Concave inclined surface formed on an upper surface of the lower underlying gasket is formed of a pair of planes inclined toward the substantially central downward from an outer edge portion side opposite of the lower underlying gasket,
The convex inclined surface formed on the lower surface of the upper basic packing is formed of a pair of planes inclined substantially downward from the outer edge side of the upper basic packing facing the center,
Said base packing which a plurality interposed, the recess which is inclined in the other direction orthogonal to the set of basic packing with the concave inclined surface and said protrusion inclined surface inclined to one direction, before Symbol one direction The base-isolated foundation structure according to claim 1, further comprising an inclined surface and a set of the foundation packing provided with the convex inclined surface. On the upper surface of the lower base packing, a concave groove portion provided to be recessed from the outer edge portion and formed larger than the width of the upper base packing,
A gap formed by fitting the concave groove and the upper base packing,
The base isolation structure according to claim 1, further comprising a damping material installed in the gap. Anchor bolts embedded in the foundation;
A shock absorber installed on the lower member;
The connecting member connecting the anchor bolt and the shock absorber through the through hole penetrating the lower base packing, the upper base packing, and the lower member. 4. Base isolation structure according to any one of 3 above.

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