JP4736229B2 - Roller seismic isolation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roller seismic isolation device that uses a roller (rolling element) to prevent vibrations such as earthquakes and traffic vibrations from being transmitted to structures such as buildings.
[0002]
[Problems to be solved by the invention]
The roller seismic isolation device usually has a roller and a vertical contact rolling surface that is arranged to face each other in the vertical direction with the roller in between, and that the roller contacts and rolls. And a roller support mechanism for supporting a vertical load applied to the upper contact rolling surface via a roller, while the lower contact rolling surface is fixed to the ground side of the foundation or the like, while the upper contact rolling surface Is used by being fixed to the structure side such as a building.For example, the horizontal vibration of the lower contact rolling surface due to the rolling of the ground due to an earthquake is not transmitted to the upper contact rolling surface by rolling of the roller. In this way, the structure is designed to be seismically isolated.
[0003]
In such a roller seismic isolation device, a guide mechanism is provided so that a roller disposed between the upper and lower contact rolling surfaces rolls in a predetermined direction. As one of the guide mechanisms, a pinion and this pinion are provided. In the case where the racks are meshed with each other, it is possible to position the rollers as well as guide the rollers in the rolling direction, which is very preferable. However, in such a guide mechanism composed of a pinion and a rack, the rollers can roll. In order to carry out smoothly, the meshing part designed based on the so-called gear meshing theory is used.
[0004]
By the way, the rollers disposed between the upper and lower contact rolling surfaces are in substantially line contact with the upper and lower contact rolling surfaces. However, in such a line contact portion, the rollers and In some cases, at least one of the upper and lower contact rolling surfaces is elastically deformed, and sometimes plastically deformed, and the distance between the upper and lower contact rolling surfaces, the axial center position of the roller, and the like may be displaced.
[0005]
When displacement occurs in the distance between the upper and lower contact rolling surfaces, the axial center position of the roller, etc., fluctuations occur in the meshing part of the pinion and the rack that are designed to have regular positions. However, it is not based on the so-called gear meshing theory, and the pinion is tightly meshed with the teeth of the rack, so that there is a possibility that the roller does not roll smoothly. If the pinion and the rack are loosened in advance with a sufficient clearance in consideration of elastic deformation and plastic deformation of the rollers, upper and lower contact rolling surfaces, etc., the teeth of the pinion ride on the teeth of the rack. There is a possibility that it will not be possible to cause breakage of the roller or to accurately position the roller.
[0006]
The above-mentioned problem also occurs when the upper contact rolling surface is deformed (flexible deformation) due to the large movement of the roller, and is not limited to the guide mechanism of the combination of the pinion and the rack. The guide mechanism may be a combination of a linear motion body having no roller positioning function and a rail in which the linear motion body is slidably engaged in the rolling direction of the roller.
[0007]
The present invention has been made in view of the above-described points, and the object of the present invention is to roll the roller even if elastic deformation, plastic deformation, or bending deformation of the roller, the upper and lower contact rolling surfaces occur. An object of the present invention is to provide a roller seismic isolation device that can perform smoothly.
[0008]
[Means for Solving the Problems]
The roller seismic isolation device according to the first aspect of the present invention includes a roller, a vertical contact rolling surface that is arranged to face each other in the vertical direction with the roller interposed therebetween, and that the roller contacts and rolls. And a guide means for guiding the rolling direction of the roller between the upper and lower contact rolling surfaces to be constant, and supports a vertical load applied to the upper contact rolling surface via the roller. The guide means includes a movable engagement member coupled to the roller, a fixed engagement member engaged with the movable engagement member, a vertical contact rolling surface, and a roller. Elasticity that elastically deforms in accordance with the magnitude of the vertical force generated at the engagement portion between the movable engagement member and the fixed engagement member due to elastic deformation, plastic deformation, or flexural deformation of at least one of Member.
[0009]
In the roller seismic isolation device according to the first aspect, the guide means for guiding the roller in a constant rolling direction is caused by elastic deformation, plastic deformation, or bending deformation of at least one of the upper and lower contact rolling surfaces and the roller. Since the elastic member is elastically deformed corresponding to the magnitude of the vertical force generated at the engagement portion between the movable engagement member and the fixed engagement member, it is assumed that the upper and lower contact rolling surfaces are Even if at least one of the roller and the roller is elastically deformed, plastically deformed, or bent, and the vertical force generated at the engagement portion between the movable engaging member and the fixed engaging member is increased, the elastic member is deformed. Thus, the fixed engagement member escapes from the movable engagement member, and the phenomenon such as the biting at the engagement portion can be eliminated, and the smooth rolling of the roller can be ensured.
[0010]
In the roller seismic isolation device of the present invention, like the roller seismic isolation device of the second aspect, the movable engagement member has a pinion connected to the roller, and the fixed engagement member is a pinion. A meshing rack may be provided, and if such a pinion and a rack are provided to constitute the guide means, the roller can be smoothly rolled, and the roller is always in contact with the vertical contact rolling surface. And the roller does not deviate from the initial setting position with respect to the vertical contact rolling surface.
[0011]
The guide means may include a slider connected to the roller as a movable engagement member, and a rail as a fixed engagement member on which the slider is fitted so as to be freely movable.
[0012]
In the roller seismic isolation device of the present invention, as in the roller seismic isolation device of the third aspect, a plurality of roller support mechanisms may be laminated so that the rolling directions of the rollers are perpendicular to each other. According to such a roller isolator, the structure can be isolated from vibrations in all directions in a horizontal plane.
[0013]
The roller seismic isolation device of a preferred example of the present invention has a base that supports the upper and lower contact rolling surfaces and the fixed engagement member, wherein the elastic member includes a base and a fixed engagement member. The elastic member is elastically deformed corresponding to the displacement in the vertical direction relative to the base of the movable engagement member based on deformation of at least one of the upper and lower contact rolling surfaces and the roller. It is supposed to be.
[0014]
In the preferred embodiment of the roller seismic isolation device according to the present invention, the upper and lower contact rolling surfaces are flat surfaces. In this case, the upper contact rolling surface is defined as the origin with respect to the lower contact rolling surface after the seismic isolation operation. It is preferable to add an origin return mechanism for returning to a position, such as a laminated rubber seismic isolation device, but the present invention is not limited to this, and the vertical contact rolling surface may be a concave surface, and the vertical contact made of such a concave surface When a roller is interposed between the rolling surfaces, the upper contact rolling surface can be returned to the origin position with respect to the lower contact rolling surface after the seismic isolation operation, and in particular, no origin returning mechanism is required.
[0015]
The number of rollers used in the present invention may be at least one for each of the upper and lower contact rolling surfaces. However, the use of a plurality of rollers is preferable because a large load can be received.
[0016]
Next, the present invention and its embodiments will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1 to FIG. 3, the roller seismic isolation device 1 of this example includes a lower base 2, an intermediate base 3, an upper base 4, and a lower base 2 and an intermediate base 3. Between the intermediate base 3 and the upper base 4, the intermediate base 3 is supported by a roller support mechanism 5 that supports the intermediate base 3 movably in one direction, that is, in the X direction. 3 is provided with a roller support mechanism 5a for supporting the upper base 4 movably in another direction in the horizontal plane, that is, in the Y direction orthogonal to the X direction.
[0018]
The lower base 2 is fixed to the base 12 by anchor bolts 11 at the lower surface 10, and a steel plate 16 having a flat upper surface is fixed to the upper surface 13 of the lower base 2 by bolts 14 and mounting brackets 15. The intermediate base 3 is movably disposed in the X and Y directions between the lower base 2 and the upper base 4, and the lower surface 17 of the intermediate base 3 is similar to the steel plate 16, A steel plate 20 having a flat lower surface is fixed by a bolt 18 and a mounting bracket 19, and the upper surface 21 of the intermediate base 3 has a flat upper surface by a bolt 22 and a mounting bracket 23, similarly to the steel plate 16. A steel plate 24 is fixed, and a building 26 such as a building is placed on the upper surface 25 of the upper base 4 and fixed by bolts 27. Similarly to the steel plate 16, the bolt 29 and the mounting bracket 3 It is fixed steel plate 31 having a flat lower surface by.
[0019]
In the roller support mechanism 5a stacked above the roller support mechanism 5, the lower base 2 and the intermediate base 3 corresponding to the roller support mechanism 5 are the intermediate base 3 and the upper base 4, respectively. Since the rolling direction Y of the roller 41a is configured to be substantially the same as that of the roller supporting mechanism 5 except that the rolling direction Y of the roller supporting mechanism 5 is orthogonal to the rolling direction X of the roller 41, the following The roller support mechanism 5 will be described in detail, and the roller support mechanism 5a will be described as necessary by adding “a” to the same reference numeral for the corresponding configuration.
[0020]
The roller support mechanism 5 is provided with a pair of rollers 41 and a flat vertical contact rolling surface that is arranged to face each other in the vertical direction with the roller 41 interposed therebetween and that the roller 41 contacts and rolls in the X direction. 42 and 43 and a guide means 44 for guiding the rolling direction X of the roller 41 between the upper and lower contact rolling surfaces 42 and 43 to be constant, and is added to the upper contact rolling surface 42. The load in the vertical direction Z, that is, the vertical load is supported via the roller 41.
[0021]
A pair of cylindrical rollers 41 extending long in the Y direction are connected to each other by connecting plates 51 to be described later, and the lower contact rolling surface 43 is formed of a flat upper surface of the steel plate 16 and is an upper contact rolling. The surface 42 is a flat lower surface of the steel plate 20.
[0022]
The guide means 44 includes a pinion 52 as a movable engagement member connected to both ends of the roller 41, racks 53 and 54 as fixed engagement members engaged with and engaged with the pinion 52, Corresponds to the vertical force (load direction or vertical direction) generated in the meshing portions 62 and 63 that are the engagement portions with the racks 53 and 54 having teeth meshing with the pinion 52, that is, the magnitude of the vertical load in the Z direction. And elastic members 55 and 56 made of elastically deformed rubber plates or the like.
[0023]
Each pinion 52 is fixedly connected to one end of the roller 41 in this example, but instead, the pinion 52 is centered on one end of the roller 41 so that it can rotate independently of the rotation of the roller 41. It may be connected via a shaft so as to be rotatable in the R direction.
[0024]
The connecting plate 51 is rotatably attached to the pinion 52 via a shaft 57 and is held by the connecting plate 51 so that the distance between the pair of rollers 41 is constant.
[0025]
The rack 53 and the elastic member 55 that extend long in the X direction and are arranged at both ends in the Y direction of the steel plate 16 are fixed to the upper surface 13 of the lower base 2 by screws 58 and fixtures 59, and are also in the X direction. The racks 54 and the elastic members 56 that extend long and are arranged at both ends in the Y direction of the steel plate 20 are fixed to the lower surface 17 of the intermediate base 3 by screws 60 and fixtures 61.
[0026]
In the roller seismic isolation device 1 having the roller support mechanisms 5 and 5a described above, when an earthquake occurs and the foundation 12 vibrates in the Y direction, for example, the roller 41a contacts the upper and lower contact rolling surfaces 42a and 43a in the Y direction. As shown in FIG. 4, the upper base 4 on which the building 26 is placed is moved in the Y direction relative to the foundation 12, so that seismic vibrations are not transmitted to the building 26. Do a tremor. The same applies to the vibration in the X direction of the foundation 12 caused by an earthquake. The intermediate base 3 is moved in the X direction relative to the foundation 12 and the earthquake vibration is transmitted to the building 26 through the intermediate base 3. Do not do seismic isolation.
[0027]
In the roller seismic isolation device 1, when the roller 41 contacts the vertical contact rolling surfaces 42 and 43 and rolls in the X direction, the pinion 52 also rolls in the X direction while meshing with the racks 53 and 54. As a result, the roller 41 is guided in the rolling direction X, and the roller 41 can always roll at a predetermined position on the upper and lower contact rolling surfaces 42 and 43. The roller 41 does not deviate from the initial setting position.
[0028]
In addition, in the roller seismic isolation device 1, the guide means 44 that guides the roller 41 so as to make the rolling direction X constant has a vertical force generated at the meshing portions 62 and 63 between the pinion 52 and the racks 53 and 54. Since the elastic members 55 and 56 that elastically deform in accordance with the size are provided, at least one of the upper and lower contact rolling surfaces 42 and 43 and the roller 41 is elastically deformed and plastically deformed. Even if the roller 41 is greatly moved in the X direction, the intermediate base 3 is deformed (bending deformation), and the vertical force generated at the meshing portions 62 and 63 between the pinion 52 and the racks 53 and 54 increases. Then, the elastic members 55 and 56 are elastically deformed so that the thickness is reduced, and the racks 53 and 54 escape from the pinion 52 to cause a phenomenon such as the engagement at the engagement portions 62 and 63. Obtained comb can be smoothly performed rolling of the X direction of the roller 41.
[0029]
In the above example, the elastic members 55 and 56 are brought into contact with the upper surface 13 of the lower base 2 and the lower surface 17 of the intermediate base 3, and the rack 53 is placed on the upper surface of the elastic member 55 and the rack is placed on the lower surface of the elastic member 56. 54, but instead of this, as shown in FIG. 5, steel plates 71 and 72 are provided in contact with the upper surface 13 of the lower base 2 and the lower surface 17 of the intermediate base 3, and the steel plates 71 and 72 The guide means 44 may be embodied by interposing elastic members 55 and 56 made of rubber plates or the like between the racks 53 and 54, respectively.
[0030]
Further, the elastic members 55 and 56 interposed between the upper surface 13 of the lower base 2 and the lower surface 17 of the intermediate base 3 and the racks 53 and 54 are not limited to one, and a plurality of elastic members may be used. Elastic members having different elastic coefficients may be used.
[0031]
Further, in the above example, the guide means 44 is embodied by using the pinion 52 and the racks 53 and 54. However, instead of or together with this, as shown in FIG. The slider 81 connected and the rails 82 and 83 on which the slider 81 is fitted so as to be movable in the X direction as a fixed engagement member may be provided. The elastic members 55 and 56 may be interposed between the upper surface 13 and the lower surface 17 of the intermediate base 3 and the rails 82 and 83.
[0032]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even if elastic deformation, plastic deformation, and bending deformation of a roller, an up-and-down contact rolling surface, etc. arise, the roller seismic isolation device which can make a roller roll smoothly can be provided. .
[Brief description of the drawings]
FIG. 1 is an explanatory front view of a preferred example of an embodiment of the present invention.
2 is an explanatory plan view of a part of the example shown in FIG. 1; FIG.
FIG. 3 is a partially enlarged explanatory view of the example shown in FIG. 1;
4 is an operation explanatory diagram of the example shown in FIG. 1. FIG.
FIG. 5 is a partially enlarged front explanatory view of another preferred example of an embodiment of the present invention.
FIG. 6 is a partially enlarged front explanatory view of still another preferred example of an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roller seismic isolation device 5 Roller support mechanism 41 Roller 42 Upper contact rolling surface 43 Lower contact rolling surface 44 Guide means 52 Pinion 53, 54 Rack 55, 56 Elastic member

Claims (3)

A roller, a vertical contact rolling surface that is arranged to face each other in the vertical direction with this roller in between, and that the roller contacts and rolls, and the roller rolling between the vertical contact rolling surface A guide unit that guides the direction to be constant, and a roller support mechanism that supports a vertical load applied to the upper contact rolling surface via a roller. a movable engagement member connected to each end of the roller, the fixed engagement members respectively of the movable engaging member is engaged, at least one of the elastic deformation of the upper and lower contact rolling surface and the rollers, the plastic deformation or due to the flexural deformation and provided with an elastic member in response to the magnitude of the vertical force occurring in the engagement portion between each of the fixed engagement member and the respective movable engaging member elastically deformed, Each elastic member includes a movable engagement member and a fixed engagement member. It is provided along the rolling direction of the roller at the end of the roller so as to receive the vertical force generated at the joint portion via the fixed engagement member and to elastically deform corresponding to the size in the vertical direction. in which roller seismic isolation system. The roller seismic isolation device according to claim 1, wherein the movable engagement member includes a pinion connected to each end of the roller , and the fixed engagement member includes a rack that meshes with the pinion.   The roller seismic isolation device according to claim 1 or 2, wherein a plurality of roller support mechanisms are laminated so that the rolling directions of the rollers are orthogonal to each other.

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