JPH10280731A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the uplift of a vibration isolation object by providing an uplift preventing function to at least one of a plurality of vibration isolation bearings provided between footing and vibration isolation object. SOLUTION: A plurality of vibration isolation bearings 13 and 14 are arranged on a footing, house 12, etc., as lightweight construction are borne by them. Then, a liftup preventing function is provided and, at the same time, for example, the bearings 13 are installed opposingly at both ends of each of two diagonals in the floor surface of the first floor in the house 12. Then, a plurality of bearings 14 are installed at proper positions in the floor surface of the first floor in the house 12 without providing the liftup preventing function. The bearings 13 are formed of first bearing members borne on the footing, second bearing members for bearing a vibration isolation object and moving members movable to the second bearing members in the approximately horizontal direction and arranged so as to control the movement in the separate direction of the first and second bearing members. By the constitution, the liftup of the vibration isolation object in the case of an earthquake can be prevented at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device for preventing an object to be isolated from rising.

[0002]

2. Description of the Related Art In general, some heavy structures such as buildings are equipped with a seismic isolation device in which a seismic isolation bearing is interposed between the foundation and a heavy structure. As the seismic isolation bearing, a laminated rubber seismic isolation bearing is often used and is a heavy structure, so that the occurrence of a floating phenomenon of the heavy structure during an earthquake or the like is extremely low.

At present, lightweight structures such as single-family houses are focused on earthquake-resistant structures, and those equipped with expensive seismic isolation devices are hardly widespread at present. If the light-weight structure is provided with a seismic isolation device, an overturning moment is generated in the light-weight structure due to an earthquake or wind force.

On the other hand, Japanese Patent Application Laid-Open No. 3-87476 discloses a support beam projecting from a column base and / or a foundation beam of a seismic isolation target (structure) and a support beam projecting from a wall on the foundation. There is disclosed a structure in which a horizontal spring / lift prevention material is interposed between the beam and the beam to prevent the floating phenomenon of the seismic isolation target even by a falling moment during an earthquake.

[0005]

However, in the prior art described in the above publication, the structure of the foundation is particularly complicated and the cost of the foundation is high, and it is not suitable for a lightweight structure such as a detached house requiring a low price. Appropriate.

SUMMARY OF THE INVENTION The object of the present invention is to provide a seismic isolation device which can prevent the floating phenomenon of a seismic isolation target at the time of an earthquake or the like at low cost.

[0007]

According to a first aspect of the present invention, a plurality of seismic isolation bearings are disposed between a foundation and a seismic isolation target so that the seismic isolation target is isolated. In the device,
At least one of the plurality of seismic isolation bearings is a seismic isolation bearing having a function of preventing the seismic isolation target from floating on the foundation.

According to a second aspect of the present invention, in the first aspect of the present invention, the seismic isolation bearings having the function of preventing floating are installed at opposite ends on the bottom surface of the object to be isolated. Things.

The invention described in claim 3 is the first or second invention.
In the invention described in (1), the seismic isolation bearing having the function of preventing floating includes a first support member supported on a foundation, a second support member for supporting an object to be seismically isolated, A movable member that is movable in a substantially horizontal direction with respect to the second support member and that is arranged to restrict the movement of the first and second support members in the separating direction. .

According to a fourth aspect of the present invention, in the third aspect of the present invention, the first support member is a first rail installed on a foundation, and the second support member is a base-isolated object. A second rail which supports an object and is arranged orthogonal to the first rail, wherein the moving member is engaged with the first and second rails, respectively, and is movable in a longitudinal direction of the first and second rails; And a slider for restricting movement of the first and second rails in the separating direction.

According to a fifth aspect of the present invention, in the first to fourth aspects, the seismic isolation target is a house.

[0012]

The invention according to claim 1, 3 or 4 has the following effects. The vertical load from the seismic isolation target is supported by both the seismic isolation bearing with the function of preventing floating and the seismic isolated bearing without the function of preventing floating, and the lifting force generated by an earthquake, wind force, etc. Is supported by seismic isolation bearings with a function to prevent lifting. Since the seismic isolation bearings without the lifting prevention function have a simpler structure and are less expensive than the seismic isolation bearings with the function, the floating phenomenon of the seismic isolation target during an earthquake or the like is reduced. Can be prevented.

The second aspect of the invention has the following operation. Seismic isolation bearings equipped with an anti-elevation function are installed at opposite ends on the bottom of the seismic isolation target, so these seismic isolation bearings reliably prevent the seismic isolation target from rising. it can.

The fifth aspect of the invention has the following operation. The seismic isolation target is a house as a lightweight structure, and even if a floating force acts on this house due to an earthquake or wind force,
The seismic isolation bearing having the function of preventing the floating can prevent the floating phenomenon of the house at low cost.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a house equipped with one embodiment of a seismic isolation device according to the present invention. FIG. 2 is a plan view of the floor on the first floor in the house of FIG. FIG. 3 is a perspective view showing a rail seismic isolation bearing having a function of preventing the seismic isolation in the seismic isolation device of FIG. 1. FIG.
FIG. 2 is a perspective view showing a rolling seismic isolation bearing having no floating prevention function in the seismic isolation device of FIG. 1. FIG.
It is a perspective view which shows the sliding seismic isolation support part which does not have a floating prevention function in the seismic isolation device of FIG.

As shown in FIG. 1, a seismic isolation device 10 has a plurality of seismic isolation bearings 13 and 14 disposed between a foundation 11 and a detached house 12 which is a lightweight structure to be seismically isolated. The seismic isolation bearings 13 and 14 are used to seismically support the house 12.

The seismic isolation bearing section 13 is a seismic isolation bearing section having a function of preventing lifting, and as shown in FIG.
On the floor of the first floor, four units will be installed, one at each end on each of the two diagonal lines. Further, the seismic isolation bearing 14 is a seismic isolation bearing that does not have a function of preventing floating, and a plurality, for example, five, are installed at appropriate positions on the floor of the first floor of the house 12.

The seismic isolation bearing part 14 is a rolling seismic isolation bearing part 14A as shown in FIG. 4, and is provided on a first tray 15 installed and supported on the foundation 11, and on the floor of the first floor of the house 12. A second tray 16 fixed and supported, and a first tray 1
5, and a ball 17 interposed between the second receiving trays 16. The contact surface 18 with the ball 17 in the first tray 15 and the second tray 16 is formed as a curved surface. The ball 17 vibrates while rolling along the contact surface 18 of the first tray 15 and the second tray 16, and the rolling seismic isolation bearing 14 A reduces the vibration of the house 12 at the time of the earthquake and has a seismic isolation function. Fulfill.

The seismic isolation bearing 14 having no lifting prevention function may be a sliding seismic isolation bearing 14B shown in FIG. The sliding seismic isolation bearing 14B includes a tray 19 installed and supported on the foundation 11, and a support column 20 fixedly supported on the floor of the first floor of the house 12. When the lower surface of the support column 20 moves horizontally on the upper surface of the pan 19, the sliding seismic isolation bearing 14B
Reduces vibration during earthquakes and performs a seismic isolation function. Note that the lower surface of the support column 20 and the upper surface of the tray 19 may be formed as curved surfaces.

Further, the seismic isolation bearing 14 having no floating prevention function is not limited to the case where the whole is composed of the rolling seismic isolation bearing 14A and the whole is composed of the sliding seismic isolation bearing 14B. Or one or more of the above rolling seismic isolation bearings 1
4A may be combined with a plurality of or one or more sliding seismic isolation bearings 14B.

The seismic isolation bearing 13 having the function of preventing floating is a rail seismic isolation bearing shown in FIG. 3, and includes a first rail 21 as a first support member and a second rail 21 as a second support member. It has a rail 22 and a slider 23 as a moving member. The slider 23 is configured such that a first slider element 24 and a second slider element 25 are connected by a support 26.

The first rail 21 is fixed to a support plate 27, and is set on the foundation 11 via the support plate 27. The sliding surface 28 of the first rail 21 extends in a substantially horizontal direction, and the first rail 21 is formed as a curved surface whose central position in the longitudinal direction is depressed as compared with the others.

The second rail 22 is fixed and supported on the floor of the first floor of the house 12, and is arranged so that its longitudinal direction is orthogonal to the longitudinal direction of the first rail 21. This second rail 22
In this case, the sliding surface 29 extends substantially in the horizontal direction, and has a curved surface whose central position in the longitudinal direction is depressed as compared with the others.

The first rail 21 has an engaging protrusion or an engaging recess (the engaging protrusion 30 in the present embodiment) along the sliding surface 28. Further, the second rail 22 is formed with an engaging projection or an engaging recess (the engaging recess 31 in the present embodiment) along the sliding surface 29.

First slider element 2 of slider 23
4 is a first rail that can be engaged with the engagement projection 30 of the first rail 21.
An engagement portion 33 is provided. Also, the second slider element 2
5 is a second rail that can be engaged with the engagement recess 31 of the second rail 22.
An engagement portion 34 is provided. In a state where the first engagement portion 33 of the first slider element 24 is engaged with the engagement projection 30 of the first rail 21, the first slider element 24 moves along the sliding surface 28 of the first rail 21. It is movable in the longitudinal direction of one rail 21. Also, the second slider element 25
The second slider element 25 moves along the sliding surface 29 of the second rail 22 in the longitudinal direction of the second rail 22 in a state where the second engagement portion 34 is engaged with the engagement recess 31 of the second rail 22. Can be moved. As a result, the seismic isolation bearing 13
The (rail seismic isolation bearing unit) performs a seismic isolation function by reducing the vibration of the house 12 during an earthquake.

Further, as described above, the first engagement portion 33 of the first slider element 24 engages with the engagement projection 30 of the first rail 21 and the second engagement portion 34 of the second slider element 25. Are engaged with the engaging recesses 31 of the second rail 22, and the first slider element 24 and the second slider element 25 are connected by the support posts 26 to form the slider 23. Rail 2
The movement of the first and second rails 22 in the separating direction is restricted.
Thus, the seismic isolation bearing 13 has a floating prevention function for preventing the floating phenomenon even if a floating force acts on the house 12 due to an earthquake or wind force on the house 12 to generate a falling moment.

Therefore, according to the above embodiment, the following effects are obtained. The vertical load from the house 12 can be applied to the seismic isolation bearing 13 (rail seismic isolation bearing) provided with a floating prevention function and the seismic isolation bearing 14 (rolling seismic isolation bearing 14) not provided with a floating prevention function.
A, the sliding seismic isolation bearings 14B) are supported together, and the seismic isolation bearings 13 having a floating prevention function support the lifting force generated during an earthquake or due to wind power or the like. Since the seismic isolation bearing 14 without the function of preventing the lifting is simpler in structure and inexpensive than the seismic isolation bearing 13 with the function, the floating phenomenon of the house 12 during an earthquake or the like can be reduced. Can be prevented.

Seismic isolation bearing 1 having a function to prevent lifting
3 are installed on two diagonally opposite ends on the floor of the first floor of the house 12, so that the seismic isolation bearings 13 can reliably prevent the house 12 from rising.

The object to be seismically isolated is a house as a lightweight structure, and even if a floating force acts on the house 12 due to an earthquake, wind force, or the like, the seismic isolation bearing 1 having a function of preventing the house from rising.
3, the floating phenomenon of the house 12 can be prevented at low cost.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, the seismic isolation bearing 13 having the function of preventing the
It was described that a total of four units were installed, one for each of the two diagonal ends of the floor on the first floor, but one for each of the two diagonal ends. It may be installed. In addition, the seismic isolation bearing 13 having this floating prevention function
One unit may be installed at the center of the floor of the first floor of the house 12. Further, when the house 12 is a large structure, four or more seismic isolation bearings 13 having a floating prevention function may be additionally provided on the outer periphery of the house 12.

Although the seismic isolation bearing 13 having the above-mentioned floating prevention function is a rail seismic isolation bearing, it may be a rolling seismic isolation bearing. Further, the seismic isolation target may be a building or equipment other than the detached house.

[0032]

As described above, according to the seismic isolation device of the present invention, the floating phenomenon of the seismic isolation target at the time of an earthquake or the like can be prevented at low cost.

[Brief description of the drawings]

FIG. 1 is a front view showing a house equipped with one embodiment of a seismic isolation device according to the present invention.

FIG. 2 is a plan view of a floor on the first floor in the house of FIG. 1;

FIG. 3 is a perspective view showing a rail seismic isolation support portion having a function of preventing floating in the seismic isolation device of FIG. 1;

FIG. 4 is a perspective view showing a rolling seismic isolation bearing having no floating prevention function in the seismic isolation device of FIG. 1;

FIG. 5 is a perspective view showing a sliding seismic isolation support portion without a floating prevention function in the seismic isolation device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seismic isolation device 11 Foundation 12 House (subject to seismic isolation) 13 Seismic isolation bearing part provided with floating prevention function 14 Seismic isolated bearing part not provided with floating prevention function 21 First rail 22 Second rail 23 Slider 24 First 1 slider element 25 second slider element 26 support 28 sliding surface of first rail 29 sliding surface of second rail 30 engaging protrusion of first rail 31 engaging recess of second rail 33 first sliding element 1 engagement portion 34 second engagement portion of second slider element

Claims (5)

[Claims] 1. A seismic isolation device having a plurality of seismic isolation bearings disposed between a foundation and a seismic isolation target, wherein at least one of the plurality of seismic isolation bearings is provided. A seismic isolation device is a seismic isolation bearing having a function of preventing the seismic isolation target from floating on the foundation. 2. The seismic isolation device according to claim 1, wherein the seismic isolation bearings having the function of preventing floating are installed at opposite ends on the bottom surface of the object to be isolated. 3. The seismic isolation bearing having the function of preventing floating includes a first support member supported on a foundation, a second support member supporting an object to be seismically isolated, 2. A moving member which is movable in a substantially horizontal direction with respect to the supporting member, and which is disposed so as to restrict the movement of the first and second supporting members in the separating direction. 2. The seismic isolation device according to 2. 4. The first support member is a first rail installed on a foundation, and the second support member supports a seismic isolation target and is a second rail arranged orthogonal to the first rail. Wherein the moving member is engaged with the first and second rails, respectively, is movable in the longitudinal direction of the first and second rails, and moves in the separating direction of the first and second rails. 4. The seismic isolation device according to claim 3, wherein the seismic isolation device is a slider that regulates the force. 5. The seismic isolation target is a house.
4. The seismic isolation device according to 4.