JP3640330B2 - Seismic isolation devices and seismic isolation structures for light weight buildings - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a seismic isolation device used to protect a building from vibration caused by an earthquake and a seismic isolation structure of a light-weight building to which the seismic isolation device is attached.
[0002]
[Prior art]
As is well known, conventional seismic isolation devices to protect buildings from vibrations caused by earthquakes are as follows: (1) The upper structure is supported from below by laminated rubber in which rubber and steel plates are alternately stacked (2) Earthquake (3) Insulation between the ground or the foundation and the superstructure is proposed. For example, as the insulation method of (3), the structure is levitated by liquid or magnetism, the ground or the foundation and the upper structure are slid (sliding support), or the roll bearing is rolled. Various things have been proposed. In addition, in the conventional seismic isolation device or seismic isolation structure, the above-described device (1) or structure and the device (2) or structure are used in combination, or the device (1) or structure and the device (3) or structure. A combination of these two has been proposed.
[0003]
[Problems to be solved by the invention]
By the way, research and development of such seismic isolation devices or structures has been rapidly progressed by major construction companies in recent years, and some of them have been put into practical use, but most of them are for heavy objects such as buildings. Yes, very few have considered seismic isolation for light-weight buildings such as detached houses. Therefore, when considering seismic isolation devices or structures for light-weight buildings such as detached houses, it may be due to the laminated rubber described in (1) above, but sufficient seismic isolation is possible even for light-weight buildings. It is currently difficult to ensure performance. Based on this, it is realistic to use the insulation method (3), particularly the sliding bearing, as a seismic isolation for light weight buildings. However, when such a sliding bearing is used, since the object is a light-weight building, the structure may be overturned or lifted or pulled out by wind pressure. Although devices or structures for preventing such adverse effects due to wind pressure while adopting such a seismic isolation structure have been proposed in the past, they are extremely complex and heavy equipment because they are applied to heavy objects. It is the actual situation, and for this reason, it cannot be denied that it is expensive, and it is practically difficult to apply to light-weight buildings such as detached houses.
[0004]
Therefore, the present invention has been proposed in order to solve the problems of the conventional seismic isolation device or seismic isolation structure described above, and even if it is a light-weight building such as a detached house, An object of the present invention is to provide a seismic isolation device or structure that can fully exhibit its functions and that also sufficiently considers the adverse effects of wind pressure.
[0005]
[Means for Solving the Problems]
The present invention has been proposed to achieve the above object, and relates to the first invention (the invention according to claim 1), which has an inverted conical recess and an upper end. Is formed with a ring-shaped flange portion whose upper surface is one sliding surface, the flange portion is embedded in an exposed state on the upper surface of the foundation, and one insertion hole is formed on the bottom surface. The lower support member is fixed to the lower surface of the base of the light weight construction, and the lower surface is placed on the upper surface of the flange portion and the other sliding surface, and the other insertion hole is formed in the center. An upper support member and a shaft portion fixed on the upper surface of the base via a nut and screwed with a screw to which the nut is screwed on the outer periphery on the upper end side, and the lower end side is inserted into the other insertion hole And the lower end side is embedded in the foundation An embedded portion whose serial made is inserted into one of the insertion hole, an upper end a lower end fixed to the lower end of the shaft portion and a anchor bolt comprising a wire portion composed is fixed to an upper end of the embedded portion, It is configured so as to be seismically isolated by contact between the one sliding surface and the other sliding surface.
[0006]
Moreover, 2nd invention (invention of Claim 2) concerns on the seismic isolation structure of a light weight building, Comprising: The seismic isolation apparatus which concerns on the said 1st invention is attached, It is characterized by the above-mentioned. To do.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a seismic isolation device according to the present invention and a seismic isolation structure for a light-weight building to which the seismic isolation device is attached will be described in detail with reference to the drawings. In addition, the seismic isolation structure using the seismic isolation device described below is used in combination with a structure in which an upper structure is supported from below by laminated rubber in which rubber and iron plates (not shown) are alternately stacked. Since the seismic isolation device using laminated rubber has been used conventionally, detailed description thereof will be omitted.
[0012]
First, the first seismic isolation device will be described in detail. As shown in FIG. 1, the seismic isolation device 1 includes a lower support member 2, an upper support member 3 whose lower surface slides on the upper surface of the lower support member 2, and an anchor bolt 4. The lower support member 2 is integrally formed of iron. As shown in FIG. 2, the lower support member 2 is formed in an inverted conical shape, and a planar shape is formed in the upper end of the concave portion 5. The flange portion 6 is formed. In addition, the upper surface of the said flange part 6 is one sliding surface which comprises this invention. Then, at the bottom of the recess 5, one insertion hole 5a through which an anchor bolt 4 described later is inserted is formed. In addition, the hole formation surface which forms said one insertion hole 5a is made into circular arc shape.
[0013]
On the other hand, the upper support member 3 is integrally formed of a metal material such as iron, and is formed in a disk shape as shown in FIG. The lower surface of the upper support member 3 is the other sliding surface that slides on the upper surface of the flange portion 6 when vibration due to an earthquake occurs. And the other insertion hole 3a in which the anchor bolt 4 is inserted is drilled in the center of the upper support member 3, and four bolt insertion holes 3b, 3c, 3d, through which the bolt 7 is inserted on the outer peripheral side. 3e is drilled. As shown in FIG. 3, the diameter l of the upper support member 3 is the same as the diameter of the flange portion 6 constituting the lower support member 2, and the upper support member 3 is fixed to the structure. The length is the same as or slightly shorter than the base of the object. Further, the anchor bolt 4 is integrally formed of iron, and as shown in FIG. 2, a screw 4a is formed on the outer periphery on the upper end side, and the lower end is bent in an arc shape to prevent it from coming off. Has been.
[0014]
Hereinafter, the construction method of the seismic isolation apparatus 1 which concerns on the structure mentioned above is demonstrated easily. First, when placing concrete as a foundation, the lower support member 2 is embedded together with anchor bolts 4 in a predetermined position in advance. The embedding operation of the lower support member 2 and the anchor bolt 4 may be performed by pressing the lower support member 2 and the anchor bolt 4 downward from above immediately after placing concrete. On the other hand, the upper support member 3 is fixed to the lower surface of the wooden base 9 via the bolts 7 and nuts 8. These bolts 7 and nuts 8 are fixing means constituting the present invention. In addition, an insertion hole (reference numeral is omitted) through which the bolt 7 is inserted is formed in the base 9 in advance, and an insertion hole through which the anchor bolt 4 is inserted is also formed. Next, the anchor bolt 4 is inserted from the upper end side into the other insertion hole 3 a formed at the center of the upper support member 3, and the lower surface of the upper support member 3 of the flange portion 6 constituting the lower support member 2. Placed on top. With this operation, as shown in FIG. 1, the lower surface of the upper support member 3 is accurately placed on the upper surface of the flange portion 6. By this operation, the washer 10 is inserted into the anchor bolt 4 protruding from the upper surface of the base 9 and the nut 11 is screwed to fix the foundation 12 and the base 9.
[0015]
According to the seismic isolation device 1 according to the above-described configuration and the seismic isolation structure such as the wooden light weight building shown in FIG. 1 using the seismic isolation device 1, when an earthquake occurs, the flange formed on the lower support member 2 Since the upper surface of the part 6 and the lower surface of the upper support member 3 slide with each other, it is possible to effectively prevent vibrations from being transmitted to the base 9. At this time, the state in which the foundation is moved to the maximum by the earthquake will be described. As shown in FIG. 4, the anchor bolt 4 is slightly bent near the bottom of the lower support member 2 and near the lower surface of the upper support member 3. Is repeated. In addition, when the vibration by an earthquake is complete | finished, it will return to the original state shown in FIG. 1 with the seismic isolation apparatus using the laminated rubber which is not shown in figure. Moreover, in this seismic isolation device 1, since one through-hole 5a formed in the bottom part of the lower support member 2 has an arc-shaped hole forming surface as described above, the anchor bolt 4 in the event of an earthquake. Even when this bending is repeated, the bent portion is not easily cut. Furthermore, in this seismic isolation device 1, as a basic configuration, since it is composed of the lower bearing member 2, the upper bearing member 3, and the anchor bolt 4, not only is it inexpensive, but also the mounting work of each member is extremely easy. Therefore, extension of the construction period can be prevented. Furthermore, since the anchor bolt 4 described above is used as a constituent element, even if the building is subjected to wind pressure due to a typhoon or the like, it is possible to effectively prevent the building from rising or falling. Further, in this seismic isolation device 1, when the width of the vibration due to the earthquake exceeds the length of the radius of the upper support member 3, the lower support member 2 and the upper support member are anchored by the anchor bolt 4 as shown in FIG. 4. Since the relative displacement length with respect to 3 is regulated, it has a role as a stopper, and can effectively prevent the risk that the lower support member 2 and the upper support member 3 are greatly displaced. .
[0016]
Next, a seismic isolation device according to a second embodiment of the present invention and a seismic isolation structure for a light-weight building to which the seismic isolation device is attached will be described in detail with reference to the drawings. As shown in FIG. 5, the seismic isolation device 20 includes a lower bearing member 2 having the same configuration as the lower bearing member 2 constituting the seismic isolation device 1 according to the first embodiment described above (detailed description is The upper support member 21, the same anchor bolt 4 as that constituting the seismic isolation device 1 according to the first embodiment, and the elastic member 22 housed in the lower support member 2. It is configured.
[0017]
The upper support member 21 is composed of a disk part 23 formed in a disk shape and a pipe part 24 that stands upward from the center of the disk part 23. Screw 24a is threaded. In addition, the other insertion hole 23a (refer FIG. 6) in which the anchor bolt 4 is penetrated is drilled in the center of the said disk part 23. As shown in FIG. The elastic member 22 is formed into an outer shape corresponding to the shape of the concave portion formed in the lower support member 2, that is, a substantially inverted triangular frustum shape, and is integrally formed of rubber in this example. An insertion hole 22a through which the anchor bolt 4 is inserted is formed in the center of the elastic member 22 in the length direction.
[0018]
And the seismic isolation apparatus 20 mentioned above is embed | buried in the foundation concrete in the state in which the lower support member 2 accommodated the said elastic member 22 in the inside like FIG. 6 which shows the seismic isolation structure of a light weight building. The lower end side of the anchor bolt 4 is also embedded in the concrete. On the other hand, the upper support member 21 is configured such that the pipe portion 24 is inserted from the lower side of the base 9 into the base 9 in which the insertion hole 9a is formed in advance, and the washer 26 is inserted into the pipe portion 24 protruding from the upper surface. It is fixed by screwing 27 to the screw 24a. The anchor bolt 4 is inserted into the pipe portion 24 through an insertion hole 22a drilled in the upper support member 22 at the front end side, and the upper end of the anchor bolt 4 projecting upward from the upper end of the pipe portion 24. The nut 28 is screwed. In addition, on the nut 27 for fixing the upper support member 21 to the base 9, one washer 29 is placed in a state of being inserted through the anchor bolt 4, and a coil spring 30 is placed on the one washer 29. Is inserted through the anchor bolt 4 and placed thereon, and the other washer 31 is inserted through the anchor bolt 4 and placed on the coil spring 30. The nut 28 is placed on the other washer 30. The anchor bolt 4 is screwed onto the screw 4a. Therefore, the base 9 is fixed by screwing the nut 28 against the elastic force of the coil spring 30.
[0019]
As described above, according to the seismic isolation device 20 according to the second embodiment described above and the seismic isolation structure using the seismic isolation device 20, the same operational effects as those of the first embodiment described above can be realized. Instead, even if the vibration due to the earthquake stops and the anchor bolt 4 is deformed, the original state can be restored again by screwing the nut 28. Further, in the seismic isolation device 20 according to this embodiment, since the elastic member 22 is disposed in the lower support member 2, local deformation of the anchor bolt 4 can be avoided, and further, the elasticity The elastic force of the member 22 can contribute to the restoring force of the building after the end of vibration.
[0020]
In the seismic isolation devices 1 and 20 according to the first and second embodiments described above, the anchor bolt 4 integrally formed from the upper end to the lower end is illustrated and described as the anchor bolt constituting the present invention. However, the anchor bolt constituting the present invention is not necessarily limited to such a configuration. For example, the anchor bolt 35 shown in FIG. 7 may be used. FIG. 7 shows a seismic isolation device 40 using the anchor bolt 35 as a constituent element instead of the anchor bolt 4 constituting the seismic isolation device 1 with respect to the seismic isolation device 1 according to the first embodiment. It is a thing. The anchor bolt 35 has an embedded portion 36 whose lower end is embedded in the foundation, a shaft portion 37 fixed to the base 9 and screwed with a screw 37a on the outer periphery on the upper end, and an upper end that is the lower end of the shaft portion 37. The lower end is composed of a wire portion 38 fixed to the upper end of the embedded portion 36. The embedded portion 36 is a portion embedded from the midway portion to the lower end in the foundation concrete, and an insertion hole 36a through which the lower end side of the wire portion 38 is inserted is formed in the upper end side midway portion, and the lower end is prevented from coming off. It is bent in an arc shape for. The shaft portion 37 has an insertion hole 37a through which the lower end side of the wire portion 38 is inserted on the upper end side.
[0021]
According to the seismic isolation device 40 or the seismic isolation structure including the anchor bolt 35 described above, the middle portion of the anchor bolt 35 is the wire portion 38. Therefore, the first or second embodiment described above can be used. Even when the force that deforms due to the vibration of the earthquake continues to act like the anchor bolt 4 constituting the seismic isolation devices 1 and 20 according to the embodiment, it is possible to effectively prevent the occurrence of metal fatigue. it can.
[0022]
In addition, the seismic isolation structure according to each of the embodiments described above is used in combination with a structure in which an upper structure is supported from below by a laminated rubber in which rubber and an iron plate (not shown) are alternately stacked as described at the beginning. However, it is not always necessary to use the laminated rubber together with the one that supports the upper structure from below, and it may be used together with other various seismic isolation devices that have been proposed.
[0023]
【The invention's effect】
According to the seismic isolation device or seismic isolation structure according to the implementation of the embodiment of the present invention described above, not only there is a seismic isolation effect that not be transmitted vibrations caused by an earthquake to a lightweight building, wind pressure during a typhoon Therefore, lighting can be effectively prevented. Moreover, the present invention is basically composed of a lower support member, an upper support member and an anchor bolt, and is an extremely simple device, so that the manufacturing cost can be sufficiently suppressed, and a wooden house or the like can be used. Even in the construction of light weight buildings, the construction becomes simple and the possibility of significantly extending the construction period can be effectively avoided.
Furthermore, since the anchor bolt constituting the present invention is provided with a wire portion, even if a force that changes due to earthquake vibration is continuously applied, metal fatigue occurs as in a normal anchor bolt. There is nothing.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a base isolation structure using a base isolation device according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the seismic isolation device shown in FIG. 1;
FIG. 3 is a plan view showing a part of the base of the seismic isolation device structure shown in FIG.
4 is a cross-sectional view showing a state most deviated from the state shown in FIG. 1. FIG.
FIG. 5 is an exploded perspective view of a seismic isolation device according to a second embodiment of the present invention.
FIG. 6 is a sectional view showing a seismic isolation structure using a seismic isolation device according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a base-isolated structure using another anchor bolt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Lower support member 3 Upper support member 3a The other insertion hole 4 Anchor bolt 5 Recessed part 5a One insertion hole 6 Flange part 9 Base 20 Seismic isolation device 21 Upper support member 22 Elastic member 35 Anchor bolt 36 Embedded part 37 Shaft part 38 Wire part 40 Seismic isolation device

Claims (2)

A ring-shaped flange portion having an inverted conical recess and having an upper surface formed as one sliding surface is formed at the upper end, and the flange portion is buried in an exposed state on the upper surface of the foundation, while the bottom surface is A lower support member in which one insertion hole is formed;
An upper support member that is fixed to the lower surface of the base of the light weight structure and that the lower surface is placed on the upper surface of the flange portion and the other sliding surface, and the other insertion hole is formed in the center;
The upper surface of the base is fixed via a nut, and the upper end side outer periphery is screwed with a screw to which the nut is screwed , the lower end side is a shaft portion inserted through the other insertion hole, and the lower end side is a foundation. A buried portion that is embedded in the first insertion hole and a wire portion that is fixed to the lower end of the shaft portion and whose lower end is fixed to the upper end of the embedded portion. Anchor bolts,
The seismic isolation device is configured to be isolated by contact between the one sliding surface and the other sliding surface. A seismic isolation structure for a light weight building, to which the seismic isolation device according to claim 1 is attached.

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