Base isolation building structure

Abstract

To provide a base isolation building structure which is easy to construct and can suppress construction costs.SOLUTION: A foundation 1 has a housing part 11 having an inner bottom surface 11a and an inner side surface 11b and an open upper part. A column 4 is erected above the inner bottom surface 11a of the housing part 11. A granular material 5 is filled between the inner bottom surface 11a and the inner side surface 11b of the housing part 11 and the column 4. A lower bottom plate 2 is provided on the inner bottom surface 11a, an upper bottom plate 3 is slidably provided on the lower bottom plate 2, and the column 4 is erected on the upper bottom plate 3. A lid 6 for closing the housing part 11 is provided, and the lid 6 has a hole for penetrating the column 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a seismically isolated building structure. [Background technology]

[0002] A conventional seismic isolation building structure is a seismic control / seismic isolation device that is installed between a concrete foundation and a building to mitigate and absorb the impact and vibration caused by an earthquake.The device main body is formed by stacking and housing multiple seismic isolation layers, each made of a synthetic resin box filled with granular material to form a vibration-damping layer, in a compressed state in the vertical direction inside a hollow column made of elastic synthetic resin, and a pair of fixing plates are fixed to the concrete foundation and building on the top and bottom surfaces of the device main body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-145198 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the seismic isolation building structure described in Patent Document 1 involves stacking multiple seismic isolation layers inside a hollow column, which makes construction difficult and increases construction costs.

[0005] The present invention has been made in response to these problems, and aims to provide a seismically isolated building structure that is easy to construct and can reduce construction costs. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the seismically isolated building structure of the present invention is characterized by having a foundation having an open storage section with an inner bottom surface and inner side surfaces, a column erected above the inner bottom surface of the storage section, and granular material filled between the inner bottom surface and inner side surfaces of the storage section and the column.

[0007] In the base-isolated building structure of the present invention, the granular material inside the storage section converts the vibration energy of vertical and horizontal earthquake vibrations into internal friction, thereby reducing it. Furthermore, because columns are erected above the inside bottom surface of the storage section of the foundation, and the granular material is filled between the inside bottom and side surfaces of the storage section and the columns, construction is easy and construction costs can be reduced. In the present invention, the granular material is preferably sand, and particularly preferably sand having a diameter of 1 / 16 mm or more and 2 mm or less.

[0008] In the seismically isolated building structure of the present invention, it is preferable that a lower bottom plate is provided on the inner bottom surface, an upper bottom plate is slidably provided on the lower bottom plate, and the pillars are erected on the upper bottom plate. In this case, during lateral shaking caused by an earthquake, resonance between the lower and upper bottom plates is prevented, and the upper bottom plate slides in response to the lateral shaking of the lower bottom plate, thereby damping the vibration energy of the lateral shaking of the lower bottom plate.

[0009] In the seismic isolation architectural structure according to the present invention, it is preferable that a lid that covers the storage section is provided, and that the lid has a hole through which the column passes. In this case, the lid can prevent the granular material from scattering outside the storage section. Also, since the pillar passes through the hole in the lid, the position of the pillar can be prevented from shifting horizontally in the event of an earthquake.

[0010] In the seismic isolation building structure of the present invention, it is preferable that the column has an outer pipe, an inner column, and a core rod, the inner column is arranged inside the outer pipe with a gap therebetween, the inner column is composed of a plurality of short columns of the same shape arranged in series with plates sandwiched between each short column, granular material is filled between the outer pipe and the inner column, and the core rod penetrates the inner column along the center line of the inner column and its lower end is supported by the upper bottom plate.

[0011] In this case, the inner column is made up of multiple short columns of the same shape arranged in series with plates sandwiched between each short column, and has a core rod whose lower end is supported by the upper bottom plate, which limits lateral movement and can attenuate the vibration energy of lateral earthquake shaking.In addition, granular material is filled between the outer pipe and the inner column, which can convert the vibration energy of vertical and lateral earthquake shaking into internal friction and reduce it.

[0012] In the seismic isolation building structure according to the present invention, it is preferable that the columns support beams at their upper ends, and that a buffer plate is provided between the columns and the beams. In this case, the vibration of the pillar can be prevented from being transmitted to the beam. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a seismic isolation building structure that is easy to construct and can reduce construction costs. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a vertical cross-sectional view showing a seismic isolation building structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the base-isolated building structure shown in FIG. 1. [Figure 3] FIG. 2 is a vertical cross-sectional view showing the column structure of the base-isolated architectural structure of FIG. 1. [Figure 4] FIG. 4 is a vertical cross-sectional view showing the upper part of the column structure and the beam material of the base-isolated architectural structure of FIG. 3. [Figure 5] FIG. 10 is a cross-sectional view showing a modified example of a seismic isolation architectural structure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show a base-isolated building structure according to an embodiment of the present invention. As shown in Figures 1 and 2, the seismic isolation building structure has a foundation 1, two lower bottom plates 2, two upper bottom plates 3, two columns 4, granular material 5, a cover 6, and a top plate 7.

[0016] Foundation 1 has an outer shape in which a rectangular parallelepiped with a smaller top surface is placed on top of the same rectangular parallelepiped, and the sides of each rectangular parallelepiped are joined by inclined surfaces that extend from top to bottom. Foundation 1 is made of concrete. Foundation 1 has two rectangular parallelepiped storage sections 11 that are open at the top. Each storage section 11 is arranged in parallel, has the same shape, and each has an inner bottom surface 11a and inner side surface 11b. Foundation 1 is surrounded on the bottom and lower periphery by crushed stone 8. Crushed stone 8 is surrounded by clay, sand, silt, gravel, etc.

[0017] Each lower bottom plate 2 is made of a stainless steel plate with smooth surfaces on both sides, and is provided over the entire inner bottom surface 11a of each storage section 11. Each upper bottom plate 3 is made of a stainless steel plate with smooth surfaces on both sides that is slightly smaller than the lower bottom plate 2, and is provided with its lower surface overlapping the upper surface of each lower bottom plate 2 so that it can slide. Each pillar 4 is made of a square pipe, extends vertically, and is erected vertically on the upper bottom plate 3 of each storage section 11. The lower end of the pillar 4 is not fixed, but rests on the upper bottom plate 3. The granular material 5 is made of sand having a diameter of 1 / 16 mm to 2 mm, and is filled between the inner bottom surface 11a and inner side surface 11b of the storage section 11 and the pillar 4. The granular material 5 may be made of shirasu or a mixture of sand and shirasu.

[0018] The lid 6 is made of a steel or stainless steel plate and is arranged to cover the top surface of the base 1 and close the storage section 11. The edge of the lid 6 is bent so that it fits over the upper part of the side of the base 1, forming a stopper. The lid 6 is slightly larger than the cross section of the pillars 4 and has two holes 61 through which the pillars 4 pass. The top plate 7 is arranged between the top surface of the base 1 and the bottom surface of the lid 6. The top plate 7 is made of a stainless steel plate with smooth surfaces on both sides and is slightly larger than the cross section of the pillars 4 and has two holes 71 through which the pillars 4 pass.

[0019] As shown in Figures 3 and 4, the column 4 has an outer pipe 41, an inner column 42, and a core rod 43. The outer pipe 41 is made of a steel pipe. The inner column 42 is provided inside the outer pipe 41 with a gap. The inner column 42 is made of multiple short columns 42a of the same shape arranged in series with plates 42b sandwiched between each short column 42a. The uppermost short column 42c has a larger diameter at the top than at the bottom. Granular material 5 is filled between the outer pipe 41 and the inner column 42. The core rod 43 passes through the inner column 42 along the centerline of the inner column 42 and is supported at its lower end by the upper bottom plate 3.

[0020] As shown in Figure 4, the column 4 supports a beam 9 at the upper end of the inner column 42, and a buffer plate 10 is provided between the uppermost short column 42a and the beam 9. The buffer plate 10 is made of felt. The buffer plate 10 has a C-shaped cross section and covers the upper end of the uppermost short column 42a.

[0021] FIG. 5 shows a modified example of the base-isolated building structure according to the embodiment of the present invention. In the modified example shown in FIG. 5, the same parts as those in the vibration-isolated building structure shown in FIGS. 1 to 4 are designated by the same reference numerals, and redundant explanations will be omitted. As shown in Figure 5, the foundation 20 is constructed by fixing two side walls 21 vertically and parallel to each other on a bottom plate, attaching stainless steel plates 22 along the inner surface of each side wall 21, and fixing two blocks 23 spaced apart between each stainless steel plate 22. The foundation 20 has a storage section 11 surrounded by the bottom plate, two stainless steel plates 22, and two blocks 23. The storage section 11 has two inner stainless steel plates 22 arranged parallel to the inside of the two stainless steel plates 22. The edges of each inner stainless steel plate 22 are fixed to the two blocks 23. The storage section 11 has an inner bottom surface 11a and an inner side surface 11b and is open at the top.

[0022] Two H-shaped steel beams 24 are erected inside the two inner stainless steel plates 22, extending vertically. Each H-shaped steel beam 24 integrally has two parallel flanges 24a and an arm portion 24b connected at right angles to each flange 24a. The two flanges 24a of each H-shaped steel beam 24 are arranged along the two inner stainless steel plates 22. The two H-shaped steel beams 24 are arranged with the edges of their flanges 24a butting against each other to form a long, narrow space inside. Inside the long, narrow space, inner columns 42 of columns 4 made of rectangular pillars are arranged with their two opposite side surfaces aligned with the flanges 24a of each H-shaped steel beam 24. There is a gap between the other two side surfaces of the column 4 and the arm portions 24b of the H-shaped steel beam 24.

[0023] The granular material 5 is filled in the spaces between the inner bottom surface 11a and inner side surface 11b of the storage section 11 and the column 4. As a result, the granular material 5 is filled between the two stainless steel plates 22 and the two inner stainless steel plates 22, between the side surface of the block 23 and the H-shaped steel 24, and between the H-shaped steel 24 and the column 4.

[0024] In the base-isolated architectural structure according to the embodiment of the present invention, the granular material 5 in the storage section 11 can convert the vibration energy of earthquake vertical and horizontal shaking into internal friction and reduce it. Furthermore, the columns 4 can be erected above the inside bottom surface 11a of the storage section 11 of the foundation 1, and the granular material 5 can be filled between the inside bottom surface 11a and inside side surface 11b of the storage section 11 and the columns 4, making construction easier and reducing construction costs.

[0025] In a seismic isolation building structure, the upper base plate 3 is slidably mounted on the lower base plate 2, and the columns 4 are erected on the upper base plate 3, so that during lateral shaking caused by an earthquake, resonance between the lower base plate 2 and the upper base plate 3 is prevented, and the upper base plate 3 slides in response to the lateral shaking of the lower base plate 2, thereby damping the vibration energy of the lateral shaking of the lower base plate 2. The low coefficient of friction between the upper base plate 3 and the lower base plate 2 is used to prevent resonance, damp vibration, and act as an isolator. In addition, since the storage section 11 is covered with the lid 6, the lid 6 can prevent the granular material 5 from scattering outside the storage section 11. Furthermore, since the pillars 4 pass through the holes in the lid 6, the position of the pillars 4 can be prevented from shifting horizontally in the event of an earthquake.

[0026] Furthermore, the inner column 42 is made up of multiple short columns 42a of the same shape arranged in series with plates 42b sandwiched between each of the short columns 42a, and has a core 43 whose lower end is supported by the upper bottom plate 3, so the core 43 limits lateral movement and can attenuate the vibration energy of lateral earthquake shaking. Furthermore, since granular material 5 is filled between the outer pipe 41 and the inner column 42, the granular material 5 can convert the vibration energy of vertical and lateral earthquake shaking into internal friction and reduce it.

[0027] The granular material 5 contained in the container 11 preferably has dilatancy. In this case, the granular material 5 can reduce earthquake energy through internal friction and dilatancy. Furthermore, the granular material 5 can reduce the base shear coefficient by acting as a damper and isolator. In addition, buffer plates 10 are provided between the pillars 4 and the beams 9, which can prevent vibrations from the pillars 4 from being transmitted to the beams 9. The buffer plates 10 can function as both a damper and an isolator. It is preferable to customize the size, position, and number of pillars 4, taking into consideration the rotation moment due to the position of the center of rigidity. This vibration-isolated building structure may be applied to buildings such as houses, as well as bridge piers, etc. [Explanation of symbols]

[0028] 1 foundation, 2 lower bottom plate, 3 upper bottom plate, 4 pillars, 5 granules, 6 lid, 7 top plate, 8 crushed stone, 9 beam material, 10 buffer plate, 11 storage section, 11a inner bottom surface, 11b inner side surface, 21 side wall, 22 stainless steel plate, 23 Block, 24 H-beam, 24a Flange, 24b Arm

Claims

1. a base having an upper open storage section with an inner bottom surface and an inner side surface; a pillar erected on the upper side of the inner bottom surface of the storage section; Granular material filled between the inner bottom surface, the inner side surface, and the pillar of the storage section, A seismic isolation building structure characterized by having:

2. The seismically isolated building structure according to claim 1, characterized in that a lower bottom plate is provided on the inner bottom surface, an upper bottom plate is slidably provided on the lower bottom plate, and the pillar is erected on the upper bottom plate.

3. The seismic isolation building structure according to claim 2, further comprising a lid for closing the storage section, the lid having a hole through which the column passes.

4. 4. A seismically isolated building structure according to claim 3, characterized in that the column has an outer pipe, an inner column, and a core rod, the inner column is provided with a gap inside the outer pipe, the inner column is composed of a plurality of short columns of the same shape arranged in series with plates sandwiched between each short column, granular material is filled between the outer pipe and the inner column, the core rod penetrates the inner column along the center line of the inner column and its lower end is supported by the upper bottom plate.

5. 5. The seismic isolation building structure according to claim 4, wherein the columns support beams at their upper ends, and buffer plates are provided between the columns and the beams.

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