JP2004238950A - Base isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolating device which works in a wide range for the size of the device, is improved in the isolating function to cope with a larger amplitude, and has a reset function for returning to the original setting condition. <P>SOLUTION: This base isolating device is provided with an upper support member 4 formed freely to rotate through an upper rotary support mechanism 3 arranged between a building frame 2 and a lower support member 7 formed freely to rotate through a lower rotary support mechanism 6 arranged between the ground 5. An upper and a lower parts of a steel ball 10 are engaged with guide grooves 8 and 9 respectively formed in the upper support member 4 and the lower support member 7 to isolate the building frame 2 and the ground 5, while interlocking the upper support member 4 and the lower support member 7 through the steel ball 10 freely to move in the horizontal direction in relation to each other. A reset function is provided by forming bottom parts of the guide grooves 8 and 9 so that a central part is deeper than both ends thereof. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a seismic isolation device that insulates between a building body side and a ground side such as a foundation concrete to protect the building from external force such as an earthquake.
[0002]
[Prior art]
Regarding this type of building seismic isolation device, there is disclosed a seismic isolation device that insulates the building by interposing a rotation support mechanism and a linear movement mechanism between the building body side and the ground side (Patent) Reference 1). The range of the relative movement in the horizontal direction that can be dealt with in this prior art is determined by the operation range of the linear movement mechanism. Accordingly, in order to increase the range that can be handled with respect to the relative movement in the horizontal direction, it is necessary to set the operation range of the linear movement mechanism to be large. There was a problem that was taken large.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-304087
[Problems to be solved by the invention]
The present invention has been developed in view of the state of the prior art as described above, and has a large operating range for the size of the device, and an improved insulating function so that it can cope with a larger amplitude. It is another object of the present invention to provide a seismic isolation device capable of providing a return function of returning to an original installation state in addition to the insulation function.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1, between an upper support member rotatably configured via an upper rotation support mechanism disposed between the ground side and a ground side of a building. A lower support member rotatably configured via a lower rotation support mechanism provided, and a guide groove formed on both of the upper support member and the lower support member in opposition to each other. A technical means is adopted in which the upper and lower bearing members are engaged with the guide grooves so that the upper bearing member and the lower bearing member are relatively movable in the horizontal direction via the steel balls. According to the present invention, by utilizing the guide grooves formed in both the upper support member and the lower support member, it is possible to substantially double the relative movement distance in the horizontal direction that can be handled. As a result, the operating range can be made large for the size of the device, and the insulation function can be improved so that it can cope with a larger amplitude. In addition, by forming at least one bottom portion of the guide groove formed on the opposing surface of the upper support member and the lower support member with which the upper end portion or the lower end portion of the steel ball abuts, the center portion side is formed deeper than both end portions. It is also possible to provide a return function (claim 2).
[0006]
According to the third aspect of the present invention, similarly to the first aspect of the present invention, the upper support member rotatably configured via an upper rotation support mechanism disposed between the upper support member and the ground side of the building; And a lower support member rotatably arranged via a lower rotation support mechanism disposed between the upper support member and the lower support member. A technical means is provided that includes an engagement moving member configured to be movable while being engaged with each other, and that the upper support member and the lower support member are relatively movably linked in the horizontal direction via the engagement movement member. In the case of the present invention as well, by employing the above technical means, it is possible to improve the insulation function by substantially doubling the relative horizontal movement distance that can be supported between the upper support member and the lower support member. . Note that the return function is achieved by forming at least the center of the engagement groove formed in the lower support member lower than both ends, or forming the center of the engagement groove formed in the upper support member higher than both ends. It can also be provided (claim 4).
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The seismic isolation device according to the present invention is suitable for a detached house, but is not limited to this, and can be widely applied as a seismic isolation device for various buildings. The specific shapes of the upper support member and the lower support member are not particularly limited in terms of function, but from the viewpoint of material cost, an elongated rail shape as in the following embodiment is suitable. The guide grooves formed in the upper support member and the lower support member may be concave as long as the upper and lower portions of the steel ball can be engaged. , V-shape, arc-shape, etc. can be adopted. Regarding the return function, the center of at least one of the bottoms of the guide grooves formed in the upper support member and the lower support member may be formed deeper than both ends as in the first embodiment described below. By forming the central portion of the engaging groove formed in the lower bearing member lower than both ends as described above, or forming the central portion of the engaging groove formed in the upper bearing member higher than both ends, as shown in FIG. The seismic isolation device according to the present invention may be provided to itself, or the return function may be left to a separately provided return mechanism, and the bottom of the guide groove and the engagement groove may be formed flat. As for the upper rotation support mechanism rotatably supporting the upper support member and the lower rotation support mechanism rotatably supporting the lower support member, an appropriate rotation support mechanism such as a thrust type bearing can be adopted. By the way, with regard to the support form of the contact portion between the upper support member or the lower support member and the engagement moving member in the invention of claim 3, for example, a small steel ball is interposed in the contact portion as in the following embodiment. Rolling support may be used, or sliding support may be performed by directly joining surfaces. Further, the engagement grooves formed in the upper support member and the lower support member may be formed on the outer surfaces of the upper support member and the lower support member as in the following embodiments, or may be formed on the upper support member and the lower support member. An appropriately shaped recess may be formed on the surface facing the support member, and an engagement groove may be formed on the inner surface of the recess. The point is that the upper support member and the lower support member can be linked to each other via the engagement moving member so as to be relatively movable in the horizontal direction.
[0008]
【Example】
FIG. 1 is an installation state diagram showing a main part of a seismic isolation device according to a first embodiment of the present invention in partial cross section, and FIG. 2 is a partial cross section showing an operation state of the seismic isolation device. It is an operation | movement state diagram. As shown in the figure, the seismic isolation device 1 according to the present embodiment has an upper part rotatably configured via an upper rotation support mechanism 3 including a thrust type bearing and the like disposed between the building and a frame 2 of the building. A support member 4 and a lower support member 7 rotatably provided via a lower rotation support mechanism 6 also composed of a thrust bearing and the like disposed between the support member 4 and the ground 5. By insulating between the building body 2 side and the ground 5 side such as foundation concrete between the building 4 and the lower bearing member 7, the building is protected from external force such as an earthquake. In the present embodiment, the upper supporting member 4 and the lower supporting member 7 are provided with a guide groove 8 having a substantially U-shaped cross section on the opposing surfaces thereof, that is, both the lower surface of the upper supporting member 4 and the upper surface of the lower supporting member 7. , 9 are formed, and the upper and lower portions of the steel ball 10 are inserted into and engaged with the respective guide grooves 8, 9, so as to be linked via the steel ball 10 so as to be relatively movable in the horizontal direction. In this case, the upper support member 4 and the lower support member 7 can relatively move in the direction along the guide grooves 8 and 9 via the steel balls 10 and can relatively rotate in a horizontal state. It is. Incidentally, by selecting the size of the steel ball 10, the gap between the lower surface of the upper support member 4 and the upper surface of the lower support member 7 can be adjusted. In this embodiment, the upper support member 4 and the lower support member 7 are formed of elongated rail-shaped members. The guide grooves 8, 9 formed in the upper support member 4 and the lower support member 7 and having a substantially U-shaped cross section are formed such that the bottom of the guide groove at the center in the longitudinal direction is deeper than the bottom of both ends. A return function is provided. The specific return characteristics can be set by the specific shape of the bottom of the guide grooves 8 and 9. Regarding the shape of the bottom of the guide grooves 8 and 9, the return function can be provided only by forming the bottom of one of the guide grooves deeper at the center than at both ends as described above.
[0009]
Next, a method of operating the seismic isolation device 1 will be described. First, in the normal installation state of the seismic isolation device 1, the upper support member 4 and the lower support member 7 are formed in the central portion where the steel ball 10 is formed deepest at the bottom of the guide grooves 8 and 9 by the weight of the frame 2. In the return state shown in FIG. Then, when an external force such as an earthquake force is applied, the upper support member 4 and the lower support member 7 are turned in the direction of the external force as shown in FIG. The two are insulated from each other so that the movement on the ground 5 side is not transmitted to the skeleton 2 side. FIG. 2 illustrates a state in which the relative movement between the upper support member 4 and the lower support member 7 has reached the maximum allowable in the present embodiment, but the guide groove 8 according to the magnitude of the external force. , 9 return from the middle of course. FIG. 3 is a perspective view of a main part showing a process of the operation of the seismic isolation device 1.
In the figure, the state (A) shows the normal installation state also shown in FIG. In this state (A), when an external force F such as seismic force is applied in the direction indicated by the arrow, first, the upper rotation support mechanism 3 and the lower rotation support mechanism 6 rotate, and as shown in the state (B). Thus, the upper support member 4 and the lower support member 7 rotate so as to face the direction of the external force F. The rotation of the upper bearing member 4 and the lower bearing member 7 is performed based on the inertial force acting on the frame 2 and the external force F acting on the ground 5. This occurs when the lower bearing member 7 is urged through the steel ball 10 so as to shift to a state where it can relatively move along the external force F. After shifting to the state (B), as shown in the state (C), based on the inertia force on the skeleton 2 side and the external force F acting on the ground 5, the upper support member 4 and the lower support member 7 relatively moves along the guide grooves 8 and 9 in the direction of the external force F via the steel balls 10 to insulate so that seismic action and the like are not transmitted to the frame 2 side.
[0010]
FIG. 4 is an operation explanatory view illustrating the relative movement between the upper support member 4 and the lower support member 7 due to the seismic force F. In the operation example shown here, when the guide groove 8 of the upper support member 4 and the guide groove 9 of the lower support member 7 are orthogonal to each other, an external force such as an earthquake force is applied in parallel to the direction of the guide groove 9 of the lower support member 7. It is assumed that F acts. In this case, since an external force acts symmetrically on the left and right of the upper support member 4, no rotational force is generated, so that the rotational operation of the upper support member 4 is changed from the illustrated state (A) to the state (B). However, there is a problem that the relative movement is performed without accompanying the movement, and the relative movement amount is reduced by half. FIG. 5 shows a first modification which is improved to solve this problem. In the first modification, the bent portions 11 and 12 are provided at both ends of the guide groove 9 of the lower support member 7. Thereby, as shown in the state (B), when the relative position of the upper support member 4 is attached to one end of the lower support member 7, the moving direction of the steel ball 10 is along the bent portion 11. Since the steel ball 10 moves in the guide groove 8 of the upper support member 4 and deviates from the central position of the upper support member 4, the left and right balance of the upper support member 4 is lost, as shown in FIG. Will rotate. Accordingly, as shown in the state (D), the relative movement distance between the upper support member 4 and the lower support member 7 can be used effectively.
[0011]
FIG. 6 is a plan view showing Modification Example 2, and FIG. 7 is an AA enlarged sectional view thereof.
In the second modification, the raised portions 13 and 14 of the steel balls 10 are formed at both edges of the guide grooves 8 and 9 of the upper support member 4 and the lower support member 7 as shown in FIG. Worked out a solution. FIG. 8 is a plan view showing Modification Example 3, and FIG. 9 is a sectional view taken along line BB of FIG. In the third modification, the deepest bottom positions of the guide grooves 8 and 9 of the upper support member 4 and the lower support member 7 are shifted from the center position as shown in the drawing, and the steel ball 10 is moved from the center in a normal installation state. The above-mentioned problem was solved by configuring the eccentric position.
[0012]
FIG. 10 is a schematic configuration diagram showing a main part of a seismic isolation device according to a second embodiment of the present invention, FIG. 11 is a cross-sectional view taken along the line CC, and FIG. 12 is an operation state diagram showing an operation state. . As shown in the figure, in the seismic isolation device 15 according to the present embodiment, engagement grooves 18 to 21 are formed on both outer surfaces of the upper support member 16 and the lower support member 17, and the engagement grooves 18 to 21 are formed. By engaging the engaging portions 23 and 24 formed on the upper engaging member 22 or the engaging portions 26 and 27 formed on the lower engaging member 25 so as to be movable with respect to The upper support member 16 and the lower support member 17 are linked so as to be relatively movable in the horizontal direction via an engagement moving member 28 composed of the upper engagement member 22 and the lower engagement member 25. Incidentally, the upper support member 16 and the lower support member 17 are connected to the building frame via the upper rotary support mechanism 3 or the lower rotary support mechanism 6 composed of a thrust type bearing or the like (not shown) as in the first embodiment. It is rotatably supported on the two sides and the ground 5 side. In this embodiment, as shown in FIG. 11, the upper engaging member 22 and the lower engaging member 25 are connected to the convex spherical portion 30 formed on the convex portion 29 of the upper engaging member 22 and the lower engaging member 22. The engagement moving member 28 is constituted by slidably joining the concave spherical portion 32 formed on the concave portion 31 of the engaging member 25 and connecting them relatively rotatably. That is, the upper support member 16 and the lower support member 17 are relatively moved along the engagement grooves 18 to 21 via the engagement moving member 28 including the upper engagement member 22 and the lower engagement member 25. It is movably linked.
[0013]
In this embodiment, when an external force such as a seismic force acts in this embodiment, as shown in FIG. 12, the upper support member 16 and the lower support member 17 are composed of the upper engagement member 22 and the lower engagement member 25. It relatively moves in the horizontal direction via the engaging member 28. In this case, as shown in the figure, the total length of the engagement grooves 18 and 19 formed on the upper support member 16 and the entire length of the engagement grooves 20 and 21 formed on the lower engagement member 25 are relatively movable. Function effectively as a simple range. Accordingly, also in this embodiment, the corresponding relative movement distance in the horizontal direction between the upper support member 16 and the lower support member 17 is almost doubled as compared with the conventional case.
[0014]
【The invention's effect】
According to the present invention, an upper support member and a lower support member that are configured to be rotatable via a rotation support mechanism disposed between the building body side and the ground are used, and the upper support member and the lower support member are used. Since the technical means of linking the bearing member so as to be relatively movable in the horizontal direction via the steel ball or the engagement moving member is adopted, a corresponding horizontal direction between the upper bearing member and the lower bearing member is adopted. The relative movement distance can be almost doubled, the operation range can be made large for the size of the device, and the insulation function can be improved so that it can cope with a larger amplitude.
[Brief description of the drawings]
FIG. 1 is an installation state diagram showing a main part of a seismic isolation device according to a first embodiment of the present invention in a partially sectional view.
FIG. 2 is an operation state diagram showing an operation state of the seismic isolation device in a partial cross section.
FIG. 3 is a perspective view of a main part showing a process of operation of the seismic isolation device.
FIG. 4 is an operation explanatory view exemplifying a relative movement between an upper support member and a lower support member due to a seismic force F;
FIG. 5 is an operation explanatory diagram showing a first modification of the first embodiment.
FIG. 6 is a plan view showing a modified example 2 in which the first embodiment is improved.
FIG. 7 is an enlarged sectional view taken along the line AA of FIG. 6;
FIG. 8 is a plan view showing a third modification in which the first embodiment is improved.
FIG. 9 is a sectional view taken along line BB of FIG. 8;
FIG. 10 is a schematic configuration diagram illustrating a main part of a seismic isolation device according to a second embodiment of the present invention.
FIG. 11 is a sectional view taken along line CC of FIG. 10;
FIG. 12 is an operation state diagram showing an operation state of the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Seismic isolation device, 2 ... Building frame, 3 ... Upper rotation support mechanism, 4 ... Upper support member, 5 ... Ground, 6 ... Lower rotation support mechanism, 7 ... Lower support member, 8, 9 ... Guide groove, 10 ... Steel balls, 11 and 12-Bent parts, 13 and 14-Rising parts of steel balls, 15-Seismic isolation device, 16-Upper support member, 17-Lower support member, 18-21-Engagement groove, 22- Upper engaging member, 23, 24 ... engaging portion, 25 ... lower engaging member, 26, 27 ... engaging portion, 28 ... engaging moving member, 29 ... convex portion, 30 ... convex spherical portion, 31 ... Concave part, 32 ... concave spherical part

Claims (4)

An upper support member configured to be rotatable via an upper rotation support mechanism disposed between the building and the skeleton side, and rotatable via a lower rotation support mechanism disposed between the ground side and the ground side. By providing a guide groove on both the upper bearing member and the lower bearing member facing surfaces, the upper and lower steel balls are engaged with the respective guide grooves. A seismic isolation device, wherein the upper bearing member and the lower bearing member are linked so as to be relatively movable in the horizontal direction via the steel balls. By returning at least one of the bottoms of the guide grooves formed on the opposing surfaces of the upper support member and the lower support member with which the upper end or lower end of the steel ball abuts, the center is deeper than both ends, thereby returning the guide. The seismic isolation device according to claim 1, which has a function. An upper support member configured to be rotatable via an upper rotation support mechanism disposed between the building and the skeleton side, and rotatable via a lower rotation support mechanism disposed between the ground side and the ground side. And an engagement moving member configured to be movable while engaging with both engagement grooves formed at appropriate positions of the upper support member and the lower support member. A seismic isolation device wherein the upper support member and the lower support member are linked to each other via a joint moving member so as to be relatively movable in the horizontal direction. A return function is provided by forming at least the center part side of the engagement groove formed in the lower support member lower than both ends, or forming the center part side of the engagement groove formed in the upper support member higher than both ends. The seismic isolation device according to claim 3.

Images