JP3739725B2 - Seismic isolation structure in wooden buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation structure in a wooden building that reliably prevents collapse and destruction of the wooden building due to an earthquake.
[0002]
[Prior art]
Conventionally, a wooden building is tightly bound to a concrete foundation by anchor bolts so that the building does not fall off the foundation due to the impact, vibration, etc. of an earthquake. The structure is designed to withstand the impact of an earthquake by providing a number of struts attached to the wall, or by providing a number of walls. The current situation is that it cannot prevent collapse or destruction.
[0003]
Therefore, the applicant of the present application, as Japanese Patent No. 3034449, “is a seismic isolation device interposed between a foundation and a foundation in a wooden building, provided with seat plates above and below an elastic body made of a compression coil spring, Invented the seismic isolation structure in a wooden building, characterized in that a cylindrical barrel portion having elasticity is provided between the seat plates and the inside thereof is hermetically closed and an air circulation port is provided in the barrel portion.
This is due to the elastic action of the elastic body, which accelerates the damping of vibrations caused by earthquakes, absorbs and absorbs shocks and vibrations generated in buildings, and is subject to impacts caused by earthquakes, especially the vertical vibrations of direct earthquakes. When the air is contracted, the air in the air chamber in the body is compressed and gradually exhausted from the air circulation hole, and the compression of the air in the air chamber promotes a buffering action against a sudden impact. The air in the room is gradually sucked in from the air circulation hole to suppress the sudden expansion state of the elastic body, and the impact generated in the elastic body that expands and contracts can be mitigated. The seismic isolation performance can be improved compared to the seismic isolation system, and the destruction and collapse of buildings can be prevented.
[0004]
[Problems to be solved by the invention]
However, while the above prior art has a reliable seismic isolation function for pitching, the seismic isolation function for rolling is deformed only by deformation of the elastic body because it is fixed to the foundation side. Because there is a limit to the amount, if an earthquake with a large amplitude that cannot be covered only by the amount of deformation of the elastic body, the impact propagates to the building, causing partial damage to the building, collapse of indoor furniture, etc. There were issues that had to be solved, such as the possibility of being denied.
[0005]
[Means for Solving the Problems]
The present invention makes it possible to slide the seismic isolation device in an arbitrary direction below the conventional seismic isolation device in view of the problem that it is difficult to deal with an earthquake of a direct type and a large amplitude based on the conventional technology. Rolling support means are provided, and the seismic isolation device is placed on the bottom surfaces of the recesses provided on the upper surfaces of a plurality of support foundations provided on the foundation slab, and a base is mounted and fixed on the seismic isolation device. In this way, the elastic body can be isolated and slidable with respect to the ground, reducing the sudden expansion and contraction of the elastic body due to the impact and vibration caused by the earthquake. By adding the amount of deformation and the amount of slide of the seismic isolation device to cope with large-amplitude earthquakes, it is possible to prevent the impact of large vertical and horizontal shaking in a direct type large earthquake from propagating to the building side. Solve the above problems.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 7 and 8, a large number of support foundations 3, 3a are provided at appropriate positions on the concrete foundation slab 1 constructed on the ground W, and seismic isolation devices 4, 4a are provided on the support foundations 3, 3a. Is placed, and the base 5 of the building 2 is placed and fixed on the seismic isolation devices 4, 4 a, and the base isolation devices 4, 4 a are supported by the support foundations 3, 3 a, and the foundation slab 1. It is in between.
[0007]
The location of the seismic isolation devices 4, 4 a... Is provided at a position corresponding to at least the lower part of the base 5 on which the main pillar 6 such as a pipe column and a through column is erected, and preferably the appropriate location between the location and the location. It is good to arrange a single or a large number, and in short, considering the weight and balance of the building 2 constructed on the foundation slab 1, the building 2 is horizontally arranged with respect to the foundation slab 1 by the seismic isolation devices 4, 4a. Like you.
[0008]
A concave portion 7 is formed on the upper surface of each support base 3, 3a, and the center of the bottom surface 7a of the concave portion 7 is a flat portion 7b. The outer peripheral portion of the flat portion 7b is a gentle slope portion 7c, and the flat portion 7b The seismic isolation devices 4, 4 a.
[0009]
As shown in FIGS. 1 to 3, the seismic isolation devices 4, 4 a... Support bolts 10, 10 a, which fix the base plates 9, 9 a on the upper and lower sides of the elastic body 8 and fix the base 5 to the upper seat plate 9. The support bolts 10, 10a are fixed to the seat plates 9, 9a by means such as nut tightening or welding.
The elastic body 8 is composed of one compression coil spring 11 or, as shown in FIG. 1, at least two compression coil springs 11 and 11a having different diameters concentrically and winding the inner and outer compression coil springs 11 and 11a. It consists of concentric compression coil springs 12 whose directions are reversed. And by making the elastic body 8 a concentric compression coil spring 12, there is no lateral buckling, vibration, etc. with respect to the shock caused by an earthquake, and it has an elastic action with as much ability as possible, so that the vibration caused by the earthquake can be further attenuated. It becomes possible to speed up.
The seat plates 9 and 9a are formed in a disk shape or a square shape having a diameter or side slightly larger than the width of the foundation slab 1 and the base 5, and side walls 13 and 13a having a predetermined height are formed on the opposing surfaces of the seat plates 9 and 9a. In addition, an approximately cylindrical synthetic rubber body 14 having elasticity is provided so as to surround the space between the seat plates 9 and 9a, and the inside is hermetically closed, and the upper and lower seat plates 9 and 9a and the body portion are sealed. The space provided by 14 is an air chamber 15.
As shown in FIG. 1, the body portion 14 has a rubber bellows having a bellows and an elastic body 8, and an adhesive is applied to each end portion that becomes a joint portion between the body portion 14 and the side walls 13 and 13 a. The end portion of the body portion 14 is externally fitted to the end portions of the side walls 13 and 13a in an airtight manner, and the joint portion between the side walls 13 and 13a and the body portion 14 is fastened by an elastic annular band 16 and 16a. Maintains airtightness.
In addition, at least one or more small air circulation ports 17 are provided at appropriate positions in the body portion 14 so that air enters and exits the air chamber 15 as the elastic body 8 is deformed. I try to reduce the impact.
[0010]
The supporting bolts 10, 10a are formed in a straight line longer than the height of the base 5, and are formed on the upper seat plate 9 by four protrusions in the cross direction at equal intervals from the center thereof, and connecting the protruding portions. The length of one side of the formed square is set longer than the width of the base 5.
[0011]
Rolling support means 18 is provided on the lower surface of the lower seat plate 9a. The rolling support means 18 allows the seismic isolation devices 4, 4a,... To slide in any direction.
The rolling support means 18 is not limited to the four free casters 19, 19a as shown in the figure, but includes, for example, the ball casters 27, 27a as shown in FIG. Any configuration may be used as long as it can slide in any direction.
[0012]
As shown in FIGS. 5 to 8, a pressing plate 20 is provided on the base 5 above the upper seat plate 9 to fix the front ends of the support bolts 10, 10 a. The seismic isolation device 4, 4 a is made of a metal plate such as a steel plate or a steel plate having a diameter or side slightly larger than the width of the base 5 and corresponding to the lower part of the base 5 where the column 6 is erected. ... Are limited to those provided with a circular or square hole of a predetermined size in the center of the holding plate 20 to form a tenon insertion port 21 of the column 6.
[0013]
Further, around the insertion port 21, four insertion holes 22, 22a,... Are formed at equal intervals on a circle having a predetermined radius from the center of the pressing plate 20.
[0014]
The seismic isolation devices 4, 4 a... Are locations where main pillars 6 such as cross-shaped, T-shaped, right-angled joints and other joint parts, pipe pillars, through pillars, etc. are erected on the base 5. For the seismic isolation devices 4, 4 a... Installed at the locations where the pillars 6 and the interposition pillars 6 a are erected, a pressing plate 20 having an insertion port 21 is used, and other pillars 6 The holding plate 20 that does not have the insertion port 21 is used in a place where there is not.
And after constructing the foundation slab 1 and the support foundations 3, 3a ..., the seismic isolation devices 4, 4a ... are placed on the bottom surface 7a of the recess 7 of the support foundations 3, 3a ... ... the base 5 is placed on the upper seat plate 9 of each seismic isolation device 4, 4a ... so that the base 5 is placed between them. In this state, the base 5 on the base isolation device 4, 4a ... Is located between the support bolts 10, 10a.
Then, the presser plate 20 is placed on the base 5 with the tips of the support bolts 10, 10 a... Inserted into the insertion holes 22, 22 a... And the nuts 23, 23 a at the projecting ends of the support bolts 10, 10 a. ... are screwed and fastened, the base 5 is clamped by the upper seat plate 9 and the holding plate 20, and the base 5 is placed and fixed on the seismic isolation devices 4, 4a, so that the foundation slab 1 and the base are fixed. Seismic isolation devices 4, 4a ... can be installed between the five.
In addition, in the joint portion and other joint portions in which the base 5 is formed in a cross shape, a T shape, or a right angle, the joint portion of each base 5 is a pressing plate 20 and a seat plate 9 above the seismic isolation devices 4, 4 a. Since the interposition can be sandwiched between them, the joint portion and joint portion of the base 5 can be firmly connected and fixed. However, if the main column 6 such as a pipe column or a through column or the column 6a is erected on the base 5, if the holding plate 20 provided with the insertion port 21 is used, the column 6 or the column from the insertion port 21 is used. 6a can be inserted into the base 5 and does not interfere with the framework of the building 2.
[0015]
As shown in FIGS. 7 and 8, a plurality of compression elastic members 24, 24a... Are appropriately disposed between the foundation slab 1 and the base 5, and the upper and lower portions of the compression elastic members 24, 24a. 5 is fixed. Further, in the drawing, the compression elastic members 24, 24a... Are coil springs, and the upper and lower portions thereof are fixed to the upper portion of the anchor bolts 25 placed on the foundation slab 1 and the lower portion of the bolts 26 fixed to the base 5. is doing.
[0016]
As means 28, 28a ... for fixing the building 2 to the foundation side (foundation slab 1 or support foundation 3, 3a ...), one of the two components of each fixing means 28, 28a ... The other side is fixed to the foundation side (the foundation slab 1 or the supporting foundation 3, 3a ...), and both can be engaged and disengaged with one touch. Specifically, as shown in FIGS. 7 and 8, a latch 29 fixed to the building 2 side and a latch receiver 30 fixed to the foundation side (the foundation slab 1 or the supporting foundation 3, 3 a...) Are configured.
[0017]
Next, the effect | action of the seismic isolation structure in the wooden building which concerns on this invention is demonstrated.
Since there is a seismic isolation device 4, 4a ... between the foundation slab 1 and the base 5 of the building 2, the deformation of the elastic body 8 and the sliding of the seismic isolation device 4, 4a ... start simultaneously or at any time when an earthquake occurs. The seismic isolation devices 4, 4 a... Accelerate the damping of the vibration due to the earthquake, and the rolling support means 18 causes the base isolation devices 4, 4 a. Since the seismic isolation devices 4, 4a,... Are movable with respect to the supporting foundations 3, 3a,... (The foundation slab 1), the allowable amplitude is increased.
However, by lowering the center of the recess 7 where the seismic isolation devices 4, 4 a, etc. are lowered to a flat portion 7 b, the seismic isolation devices 4, 4 a, and so on always return to their initial positions after the earthquake has ceased. It is made up.
[0018]
In a strong wind, for example, in the case of a typhoon in which arrival can be predicted, for example, as shown in FIG. 9A, the lever 31 in the latch 29 is raised, the U-shaped hook 32 is hooked on the latch receiver 30, and then the lever 31 is tilted to latch. If the building 2 is fixed to the foundation side (the foundation slab 1 or the supporting foundation 3, 3a ...) by the fixing means 28, 28a ... in advance by connecting the 29 and the latch receiver 30, etc., the building 2 is large. Even if a wind load acts, the building 2 does not move.
It should be noted that the fixing means 28, 28a... Normally have to be in a released state as shown in FIG. 9B, and are fixed as necessary.
[0019]
In addition, when installing the seismic isolation device 4, 4a ... based on this invention in the existing building 2, after jacking up the building 2, the existing foundation is removed and the foundation slab 1 and the support foundation 3, 3a ... After building, the building 2 is lowered and the building 2 is fixed to the seismic isolation devices 4, 4a.
[0020]
【The invention's effect】
In short, the present invention is provided between the base plates 9 and 9a provided above and below the elastic body 8 composed of the compression coil springs 11 and 11a on the plurality of support foundations 3 and 3a provided on the foundation slab 1 in the wooden building 2. a cylindrical barrel 14 having elasticity is provided on its internal as well as air-tight closure, the seismic isolation device 4 provided with vent port 17, 4a ... were placed on the barrel 14,該免Isolation system 4, 4a ... rests a base 5 between, in fixed seismic isolation structure, the lower surface of the seismic isolation device 4, 4a ... of the lower in the seat plate 9a, the recess 7 provided in the supporting foundation 3, 3a ... upper surface of the Since the rolling bearing means 18 that can move in any direction on the bottom surface 7a is provided , the seismic isolation device 4, 4a (elastic body 8) has a function of absorbing and buffering shock and vibration to the building 2, In addition to the effect of improving the seismic isolation by the impact mitigation function that acts during expansion and contraction, the seismic isolation device 4, 4a ... is the basic slab 1 ( Since it is possible to slide in any direction without being fixed to the holding foundation 3, 3a ...) side, the ground W side and the building 2 can be completely separated, so it is immune to large vertical and horizontal shaking in a direct earthquake. The seismic function can be provided to prevent the building 2 from being destroyed or collapsed and the indoor furniture falling down.
Further, since the center of the bottom surface 7a of the concave portion 7 is a flat portion 7b and the outer peripheral portion of the flat portion 7b is a gentle slope portion 7c, the seismic isolation devices 4, 4a. Even if it is located on the outer peripheral side, that is, on the gentle slope portion 7c, it automatically returns to the flat portion 7b, so that the building 2 can be automatically returned to the initial position.
[0021]
Since the upper and lower parts of the compression elastic members 24, 24a are fixed to the foundation slab 1 and the base 5, the foundation slab 1 and the building 2 can be connected, and the seismic isolation devices 4, 4a, etc. are supported by the support foundations 3, 3a. In addition to being able to be fixed so that the building 2 does not shake even if a certain amount of wind load acts on the building 2 by pressing on the upper surface of the ..., it is exempted by the elastic restoring force of the compression elastic members 24, 24a ... The seismic devices 4, 4 a can be reliably returned to the initial positions. In addition, since the vibration can be absorbed by the compression elastic members 24, 24a, etc., the seismic isolation function can be further improved.
In addition, one of the means 28, 28a... For fixing the building 2 to the foundation side (the foundation slab 1 or the supporting foundation 3, 3a...) At the appropriate position on the outer periphery of the building 2 is the foundation side (the foundation slab 1 or the support. Since the other of the fixing means 28, 28a... Is provided on the foundation 3, 3a..., And both are made detachable, the building 2 is moved to the foundation side (the foundation slab 1 or the supporting foundation 3 by the fixing means 28, 28a. , 3a ...), because the building 2 is integrated on the foundation side (foundation slab 1 or support foundation 3, 3a ...) even if a large wind load is applied, such as during a typhoon. It is possible to maintain a comfortable living environment even under strong winds without shaking, and the typhoon only arrives a few times a year. On other days, the fixing means 28, 28a, etc. are released. It can be used, and it can be made into a building 2 that does not shake even in the event of a large earthquake or strong wind. It become one.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a seismic isolation device.
2 is a plan view of the seismic isolation device of FIG. 1. FIG.
FIG. 3 is a bottom view of the seismic isolation device of FIG. 1;
FIG. 4 is a bottom view of a seismic isolation device using a ball caster as a rolling support means.
FIG. 5 is an enlarged plan view showing an installation state of the seismic isolation device.
6 is a cross-sectional view taken along the line XX in FIG.
FIG. 7 is an enlarged view of a main part of a base prone map in a building using the seismic isolation device of FIG. 1;
8 is a cross-sectional view taken along line YY in FIG.
FIG. 9 is a side view showing a fixed / released state of the fixing means.
[Explanation of symbols]
1 Foundation slab 2 Wooden building 3, 3a ... Support foundation 4, 4a ... Seismic isolation device 5 Base 7 Recess
7a Bottom
7b Flat part
7c Slope 8 Elastic body 9, 9a Seat plate
11, 11a Compression coil spring
14 Torso
17 Air distribution port
18 Rolling support means
24, 24a… Compression elastic material
28, 28a… Fixing means

Claims (4)

On a plurality of support foundations provided on a foundation slab in a wooden building , a cylindrical body having elasticity is provided between seat plates provided above and below an elastic body made of a compression coil spring to hermetically close the inside. In addition, in the seismic isolation structure in which a base isolation device provided with an air circulation port in the trunk is placed, and a base is mounted and fixed between the base isolation devices,
A seismic isolation structure in a wooden building, characterized in that a rolling support means is provided on the lower surface of the lower seat plate in the seismic isolation device so as to be movable in any direction on the bottom surface of the recess provided on the upper surface of the support foundation. . The seismic isolation structure in a wooden building according to claim 1, wherein the center of the bottom surface of the concave portion is a flat portion, and the outer peripheral portion of the flat portion is a gentle slope portion. 3. A base-isolated structure in a wooden building according to claim 1 or 2, wherein a compression elastic material is disposed between the foundation slab and the base, and upper and lower portions of the compression elastic material are fixed to the foundation slab and the foundation. One of the components in the means for fixing the building to the foundation slab or support foundation is provided at an appropriate location on the outer periphery of the building, and the other of the components in the fixing means is provided to the foundation slab or support foundation, and both can be freely attached and detached. The seismic isolation structure in the wooden building of Claim 1, 2, or 3 characterized by the above-mentioned.

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