JPS6342062B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a seismic isolation system for supporting buildings to prevent destruction or overturning of buildings, overflow of liquid in tanks, or damage to indoor equipment such as computers in buildings during earthquakes. The present invention relates to a support device.

As shown in Japanese Patent Publication No. 57-38823, the inventor supported an object through a flat rolling element with respect to the support, and this rolling element allows the object to be supported with respect to the support. We proposed a seismic isolation support device that has an external shape that allows the supported object to gradually rise as the rolling angle increases when moving. By using such rolling elements, the cost is significantly reduced compared to the conventional case in which balls are arranged between the support surface of the support body formed in spherical recesses each having an extremely large radius and the supported surface of the supported object. This is to enable the reduction of This inventor also published Japanese Unexamined Patent Publication No. 56-
As shown in Publication No. 34837, it has a flat rolling element, and this rolling element is designed so that it does not protrude from the plane at least at one of the upper end or the lower end of the center of the contact surface that comes into contact with the supported surface and the supporting surface. proposed a seismic isolation support device that is provided with a sitting surface that is flat or protrudes very slightly. This prevents the rolling elements from rattling or rolling due to micro-earthquakes or wind loads, thereby reducing the shaking of the supported object and providing a seismic isolation effect. This inventor also published Japanese Patent Application Publication No. 57-54644.
As shown in the publication, when a flat rolling element rolls, at least half of the surface that may come into contact with the supporting surface and the supported surface is a variable where r is expressed as a vector radius and θ is an angle expressed in radians. As a variable,
When r ₀ , θ ₀ , and α are positive constants, the curve drawn by the function r=r ₀ e〓 ⁽ 〓 ₀ ^- 〓 ⁾ on the polar coordinate plane is the generating line, and θ=
We have proposed a seismic isolation support device that uses a rotating curved surface that is created when rotating around the π/2 direction and is designed to approximately follow the surface that is created when the rotating curved surface is vertically symmetrically arranged around the origin of polar coordinates. As a result, the restoring force and acceleration that act on the supported object during an earthquake are almost constant regardless of displacement, and the amplitude is kept to a minimum, so that the supported object does not shake significantly during small earthquakes and the amplitude does not increase even during large earthquakes. It is something to do. In devices using such rolling elements, if slippage occurs between the rolling elements and the support or supported object during an earthquake, the rolling elements will move from their initial positions and come to rest, making it necessary to adjust their positions. Further, the supported object must have a horizontal supported surface that comes into contact with the rolling elements. To solve this problem, Japanese Patent Application Laid-Open No. 54-52822 discloses a method in which the bottom end is fixed vertically to a base with a spherical bottom surface.
A proposed seismic isolation floor is shown in which the floor panel is supported on the building floor by a swinging column whose upper end is connected to the floor panel by a pin mechanism. however,
The part of the pin mechanism where the upper end of the swinging column connects to the floor panel looks like the tapered tip of the swinging column is inserted into a recess formed in the floor panel and a stopper is applied around it. This type of connection method has the disadvantage that when the swinging column rotates significantly, the retaining portion is destroyed and it is very easy to come off.
Furthermore, since the center of rotation of the swinging column tends to be inaccurate, it is difficult to achieve smooth rotation and it is also difficult to determine the vibration characteristics.

The present invention solves these problems and provides a seismic isolation support device having rolling elements that can be connected to ensure smooth rotation about a predetermined position without coming off from the supported object at all. It is.

An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention shown in the figure, reference numeral 10 designates the entire seismic isolation support device according to the present invention, and this seismic isolation support device has a mounting member 13 fixed to the lower part of the supported object 12 and extending downward. have.
The supported object 12 usually has three or more seismic isolation support devices 10
Supported by. A nut 1 is inserted into the upper end of the mounting member 13 through a hole 15 made in the supported object 12.
6 is provided, and the lower end is bifurcated into two parts, and a pair of opposing connecting parts 21 of a connecting member 20 consisting of a cross joint are rotatably connected. be. Another pair of connecting portions 22 in the direction perpendicular to the connecting portion 21 of the connecting member 20 includes a connecting portion 27 that branches into two from the inner center of the rolling element 25 and extends upwardly from the inner center of the rolling element 25 whose lower surface side is the rolling surface 26. are rotatably connected. 28 indicates reinforcing ribs.

The rolling element 25 has a rolling surface 26 supported by the horizontal support surface 31 of the support 30, and there is no horizontal relative relationship between the support 30 and the supported object 12 from the standard state in which it does not roll in any direction. When a target displacement occurs, it rolls without slipping due to friction. The rolling elements 25 are shaped to gradually raise the supported object 12 relative to the support 30 as the rolling angle increases. As shown in FIG. 6, when the rolling element 25 rolls, the force W due to the weight of the supported object 12 acts downward, and also acts upward from the supporting body 30 to the rolling element 25 with the same magnitude due to the reaction force. A force W acts on it. The force due to this reaction is separated by a distance L from the force due to gravity, so a moment of force WL acts on the rolling element 25, but the rolling element 2
A frictional force is applied from the support surface 31 of the support body 30 to the support surface 31 of the support body 30 to balance this, and a restoring force expressed as F=L/HW is applied to the supported object 12. Here, H is the distance between the center of the connecting member 20 and the support surface 31. Due to the action of such restoring force, the supported object 12 is able to vibrate relative to the support 30, and its natural frequency is sufficiently small compared to the earthquake frequency to provide sufficient seismic isolation. It is something that can be done in a way that is effective. The rolling element 25 may be made of only metal, or the rolling surface 26 may be covered with rubber to prevent damage to itself and the supporting surface 31.

Reference numeral 35 denotes a seating surface formed almost flat near the center of the lower surface of the rolling element 25, which prevents the rolling element 25 from rattling or rolling due to micro-earthquakes or wind loads, and prevents the supported object 12 from shaking. It is becoming less and less. It is sufficient for this sitting surface to be such that the periphery of the area within the predetermined range is approximately in contact with at least one plane and does not protrude beyond this plane or protrudes very slightly. It is. Such a seating surface 35 may not be formed. Also, rolling element 2
The shape of the rolling surface 26 of No. 5 is based on Japanese Patent Application Laid-Open No. 56-34837.
As shown in the publication, at least half of the functions are functions on the polar coordinate plane where r is a variable expressed as a radius vector, θ is an angle variable expressed in radians, and r ₀ , θ ₀ , and α are positive constants. The curve drawn by r=r ₀ e〓 ⁽ 〓 ₀ ^- 〓 ⁾ is the generatrix, and the rotational surface created when rotating around the direction of θ = π/2 as the axis, the origin of the polar coordinates is the connecting member 2
It may be arranged so that it is centered at 0 and substantially follows a curved surface that is arranged downward. In this way, the restoring force that the rolling elements 25 give to the supported object 12 becomes almost constant regardless of displacement, and the amplitude is kept to a minimum.
This is to prevent the supported object 12 from shaking significantly in a small earthquake and to prevent the amplitude from increasing even in a large earthquake. Further, the rolling surface 26 of the rolling element 25 may be provided with irregularities in order to increase the frictional force.

The supported object 12 may not be supported only by three or more seismic isolation support devices 10, but may be supported using one or two seismic isolation support devices 10 and other supporting means that are movable in the horizontal direction. .

As described above, this invention is provided with the connecting member 20 made of a cross joint that connects the rolling element 25 to the mounting member 13 that attaches it to the supported object 12. Therefore, even if the rolling element 25 rotates greatly, the connecting member 13
The connecting member 20 can be rotated smoothly around the axis that passes through the center of the connecting member 20 without coming off at all.
It also has the effect of making it easy to obtain vibration characteristics.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along line AA in Fig. 1 with a part added, Fig. 3 is a sectional view taken along BB in Fig. 1, and Fig. 4 is a sectional view taken along line BB in Fig. 1.
The figure is a sectional view taken along the line CC in FIG. 2, FIG. 5 is a front view showing a state in which a plurality of seismic isolation support devices support an object, and FIG. 6 is an explanatory view of the operation. 10 is a seismic isolation support device, 12 is a supported object, 13 is a mounting member, 20 is a connecting member, 25 is a rolling element, 26
27 is a rolling surface, 27 is a connecting portion, 30 is a support body, and 31 is a support surface.

Claims (1)

[Scope of Claims] 1. A rolling element is provided at a predetermined position of a supported object at a connecting portion so as to be rotatable in all directions within a predetermined range so as to support the supported object with respect to the support body. The rolling element has a rolling surface shaped so that the supported object gradually rises as the rolling angle increases from the standard state in which it does not roll on the horizontal support surface of the support. A seismic isolation support device characterized in that it includes a connecting member made of a cross joint that connects the rolling element to a mounting member that attaches the rolling element to a supported object. 2. The seismic isolation support device according to claim 1, wherein the rolling element has at least one area around a predetermined area on the rolling surface that contacts the support surface of the support body in a standard state. A seismic isolation support device characterized in that a seating surface is formed that is substantially in contact with a flat surface and does not protrude beyond the flat surface or protrudes very slightly. 3. The seismic isolation support device according to claim 1 or 2, in which at least half of the rolling surfaces of the rolling elements are formed by a variable where r is expressed as a vector radius and θ is an angle expressed in radians. The function r= on the polar coordinate plane when r ₀ , θ ₀ , and α are positive constants.
Using the curve drawn by r ₀ e〓 ⁽ 〓 ₀ ^- 〓 ⁾ as the generating line, the rotational surface created when rotating around the direction of θ = π/2 is directed downward with the origin of the polar coordinates as the center of rotation of the rolling element. A seismic isolation support device characterized in that it almost follows the surface on which it was previously placed.