JP2006037546A - Seismically isolated structure of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismically isolated structure having a simple structure and a low manufacturing cost and being capable of remarkably relaxing the transmission of an impact to a building with the quaking of an earthquake. <P>SOLUTION: A mobile body 3 is interposed between supporting plates 1, 1a and 1b supporting the building K and a base slab 2 supported to a ground G. Upper supporters 4 and 4 are mounted on the base sides of the supporting plates 1 and lower supporters 5 and 5 at mutually opposed places of the upper supporters 4 and 4 on the top-face side of the foundation plate 2 respectively. The upper supporters 4 and 4 have upper guides and the lower supporters 5 and 5 lower guides respectively. A pair of left-right wheels 7a and 7a are disposed on the upper side of a base body 9 and a pair of before-behind wheels 7b and 7b on the lower side respectively in the mobile body 3. The wheels 7a and 7a on the upper side of the mobile body 3 can travel in the longitudinal direction along the upper guides while indentations 6a and 6a are formed at the opposed places of the travelling track surfaces 14a of a pair of the wheels 7a and 7b. The wheels 7b and 7b on the lower side can travel in the longitudinal direction along the lower guides while the indentations 6a and 6a are formed at the opposed places of the travelling track surfaces 14b of a pair of the wheels 7b and 7b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seismic isolation structure for mitigating an impact transmitted to a building during an earthquake.

Japan is an earthquake-prone country, and earthquakes occur frequently every year. Especially in the Great Hanshin-Awaji Earthquake in 1995, many buildings with poor earthquake resistance collapsed and many victims appeared. As one of the major causes of the collapse of buildings in the earthquake disaster, there was one in which the vibration of the ground and the building resonated and the amplitude expanded dramatically. Therefore, as an earthquake countermeasure as described above, for example, conventionally, a building and the ground are separated, and a buffer member such as a spring material is interposed at a plurality of locations in the space between them. Some of them absorbed.
Japanese Patent Laying-Open No. 2003-97088 (first page, FIG. 2)

  Searching for ways to mitigate the impact of buildings on earthquakes has long been underway in the construction industry, and many methods have been announced in the past. However, when building seismic isolation structures for building construction, the adoption of the seismic isolation structure tends to be avoided because it requires much labor and cost compared to conventional construction methods. For this reason, the advent of a construction method that is simple in structure and low in manufacturing cost and that can expect an efficient and reliable seismic isolation is awaited.

  An object of the present invention is to provide a seismic isolation structure that has a simple structure and is inexpensive to manufacture, and that can dramatically reduce the transmission of an impact to a building caused by an earthquake.

  Invention of Claim 1 among this invention interposes a mobile body between the support plate which supports a building, and the base plate supported by the ground, An upper support body is provided in the bottom face side of the said support plate, Further, on the top surface side of the base plate, a lower support is provided at a location opposite to the upper support, the upper support has an upper guide, and the lower support has a lower guide. The moving body has a pair of left and right wheels on the upper side of the base body and a pair of front and rear wheels on the lower side, and the upper wheel of the moving body can travel in the front-rear direction along the upper guide. In addition, a depression is formed at a position opposite to the running track surface of the pair of wheels, and the lower wheel can run in the front-rear direction along the lower guide, and the running track surface of the pair of wheels. A depression is formed at the opposite position of

  Here, front, rear, left, and right are directions determined based on one side of a building. In addition, the depression only needs to be formed at least at the position opposite to the running track surface of the wheel.For example, the depression is formed in a groove shape corresponding to each wheel, or the center is sandwiched between a pair of wheels. You may form in the shape of a rising bowl. In addition, if the wheels are arranged at least one on the front and back of the base of the moving body, and one on each of the left and right on the lower side, the wheels are supported at a total of four points from the upper and lower guides. The moving body interposed between the support plate and the base plate does not fall down. In addition, there is no problem because even when the wheels are juxtaposed with two or three wheels per place via a metal plate or the like that is pivotally supported on the base body, a sense of stability at the time of traveling in the upper and lower guides by the moving body is increased. Further, the base body only needs to be capable of disposing wheels and have durability against the weight of the building. Specifically, a metal block body, a concrete cylinder body, or the like is used.

  When formed as described above, the moving body travels back and forth or right and left along the depression of the lower guide with respect to the movement of the foundation plate that swings with the ground, while the foundation plate supported on the moving body is the foundation plate. By moving in a direction different from the travel direction of the base plate (for example, left and right if the base plate travels in the front-rear direction), in the event of an earthquake, the support plate and the base plate with the moving body are moved back and forth due to movement in different directions. Various patterns such as circles, squares, and triangles combined in the left-right direction are swung to alleviate the transmission of impact to the building.

  Further, as in claim 2 of the present invention, since the running track surface is provided with a valley-like or mountain-like slope, the support plate and the base plate sway in the front-rear and left-right directions during an earthquake. In this case, after each wheel of the moving body climbs (falls) once along the gradient provided in the depression of the traveling track surface of each of the upper and lower guides, it returns to the initial position at normal time after the earthquake has converged. Will work.

  Here, the angle of the gradient is not particularly limited, but if it is too steep, it does not function sufficiently because it prevents the moving body from running, so for example, a gentle gradient of about 5 ° to 15 ° should be used. Is desirable. In addition, the upper and lower guides are provided with depressions on the running track surface that are deep enough to fit a part of each wheel in order to prevent the moving body from inadvertently traveling during normal times. It is desirable to take measures such as making the contact point to the guide flat with a gradient from the vicinity of the contact point.

  Further, as in claim 3 of the present invention, a pitching member is interposed between the building and the support plate or between each of the two support plates divided in the vertical direction, so that the pitching occurs when an earthquake occurs. , It is possible to receive a shock that the buffer member pushes up from the ground, and to reduce the transmission of the shock to the building.

  The shock absorbing member may be any member that can buffer the impact that pushes up from the ground to the building in the event of pitching during an earthquake, and that does not impair the function of the seismic isolation structure. Examples include rubber lumps.

  According to the invention described in claim 1 of the present invention, the moving body supports the building in the front and rear (left and right), the base plate supported by the ground in the direction intersecting each left and right (front and back), Because it can be urged to swing, the impact at the time of earthquake can be mitigated by various swing patterns combined front and back and left and right by each plate, resulting in preventing fatal collapse of the building and simple structure Because of this, seismic isolation functions can be added to buildings at low manufacturing costs.

  According to the second aspect of the invention, in addition to the effect of the first aspect, after the shock at the time of the earthquake is buffered, the moving body is fixed at the normal position by the gradient provided in the depression of the running track surface of each of the upper and lower guides. You can go back to nature.

  According to invention of Claim 3 among this invention, in addition to the effect of Claim 1 and 2, the effect | action which promotes relaxation can be provided also with respect to the impact accompanying the pitching which generate | occur | produced at the time of an earthquake.

  A specific configuration of the seismic isolation structure for a building according to the present invention will be described below based on the drawings.

  As shown in FIGS. 1 and 2, the seismic isolation structure includes a support plate 1 that supports a building K, a base plate 2 that is supported by the ground G, and a moving body 3 that is interposed between the support plate 1 and the base plate 2. In the event of an earthquake, the moving body 3 is formed so as to move in the left-right direction with respect to the support plate 1 and in the front-rear direction with respect to the base plate 2. This is intended to mitigate the impact on K.

Furthermore, the functional part of the seismic isolation structure for buildings according to the present invention will be described in detail below with reference to FIGS.
First, the bottom surface side of the support plate 1 is provided with an upper support body 4 that forms a block shape extending in the left-right direction, while a block shape is similarly formed at a location corresponding to the upper support body 4 on the top surface side of the base plate 2. A lower support 5 is provided. Then, guide grooves 6a, 6a, 6b, 6b having a concave cross section are provided on the lower end surface of the upper support 4 and the upper end surface of the lower support 5, and the guide grooves 6a, 6a, 6b, 6b are provided. The running track surfaces 14a and 14b are flat at the center, and are provided with gradients R and R before and after or at the left and right of the flat portion F, respectively. Further, the traveling track surfaces 14a and 14b of the guide grooves 6a, 6a, 6b and 6b will be described in detail later, but the upper and lower wheels 7a and 7b provided in the movable body 3 travel. . Further, a flat portion F is provided on the running track surfaces 14a, 14b of the guide grooves 6a, 6a, 6b, 6b, and the inclination start points of the gradients R, R before and after the portion F are located at the flat portion F. By being close to the contact point of the wheels 7a, 7a, 7b, 7b, the rolling of the wheels 7a, 7a, 7b, 7b on the traveling track surfaces 14a, 14b of the upper and lower guide grooves 6a, 6a, 6b, 6b is to some extent. Regulating and stopping unnecessary shaking of building K during normal times.
Reference numeral 13 denotes a stopper which prevents the wheels 7a, 7a, 7b and 7b from coming out of the upper and lower guide grooves 6a, 6a, 6b and 6b.

  Next, the movable body 3 has a base 9 in the form of a block, and the upper and lower sides of the base 9 are opposed to the front and back sides of a rectangular metal plate 8a rotatably supported by a shaft 10a. On the side surface, two wheels 7a and 7a supported in parallel are provided. On the left and right side surfaces opposite to each other on the lower stage of the base 9, the shaft 10b is rotatably supported by the shaft 10b as in the above-described upper stage side. On the outer surface of the square metal plate 8b, two wheels 7b and 7b are provided that are supported in parallel.

  The movement of the moving body 3 between the support plate 1 and the base plate 2 will be described below. The upper wheels 7a and 7a are shown in FIGS. 5 (a), 5 (b) and 5 (c). The body 4 travels in the left-right direction along the upper guide grooves 6a, 6a. On the other hand, the lower wheels 7b, 7b move in the front-rear direction along the traveling track surface 14b of the guide grooves 6b, 6b of the lower support 5, as shown in FIGS. 6 (a), 6 (b), and 6 (c). More specifically, the upper and lower wheels 7a, 7a, 7b, 7b travel along the traveling raceway surfaces 14a, 14b of the upper and lower guide grooves 6a, 6a, 6b, 6b to the slopes R, R. When approaching, the upper and lower metal plates 8a and 8b pivotally supported on the base 9 of the moving body 3 with respect to the gradients R and R rotate about the shafts 10a and 10b, respectively. The vehicle travels along the traveling track surfaces 14a and 14b of the upper and lower guide grooves 6a, 6a, 6b, and 6b while maintaining the vertically standing state. By providing the gradients R and R as described above, the support plate 1 and the base plate 2 take a trajectory like a cradle through the moving body 3, and are specifically combined in a complex manner in the front-rear direction or the left-right direction. As a result, the transmission of the shock to the building K is drastically reduced. Further, the overall movement of the base isolation structure is as shown in FIGS. 7 and 8 (a), (b), (c), and (d). It can be seen that the movement in the front-rear direction is combined to act as a circular movement of the building K freely in the front-rear and left-right directions.

FIGS. 9A and 9B show another aspect of the seismic isolation structure.
Specifically, two support plates are provided on the upper and lower sides, and an air cushion 11 having an aspect like a rubber tire used for an airplane or an automobile is interposed between the support plates 1a and 1b. If it does in this way, it will become a form which receives the impact from the ground G added to the building K with respect to the shaking of a vertical direction in addition to a horizontal direction at the time of an earthquake with the elasticity of the said air cushion 11. 10A and 10B show a case where a coil spring 12 is applied in place of the air cushion 11 described above. As with the air cushion 11, the coil spring 12 is also effective for vertical shaking during an earthquake. In addition to swinging the movable body 3 in the support plates 1a and 1b and the base plate 2 in the longitudinal and lateral directions, The seismic isolation effect to the building K can be demonstrated with respect to the transmission of the impact from all assumed directions.

It is a top view which shows the whole this seismic isolation structure. It is a longitudinal cross-sectional view which shows the whole this seismic isolation structure. It is the top view to which the principal part of the seismic isolation structure of the building by this invention was expanded. It is the longitudinal cross-sectional view which notched a part which expanded the principal part of this seismic isolation structure. It is the figure explaining focusing on the motion of a support plate and a mobile body about the motion of this seismic isolation structure at the time of an earthquake. It is the figure explaining focusing on the motion of a mobile body and a baseplate about the motion of this seismic isolation structure at the time of an earthquake. It is explanatory drawing which shows the state at the time of the support plate which comprises this seismic isolation structure, a mobile body, and a baseplate. (A), (B), (C), and (D) are explanatory diagrams showing how the support plate, the moving body, and the base plate move in cooperation during an earthquake. (A) is explanatory drawing which shows the other aspect of this seismic isolation structure, (b) is explanatory drawing which shows the motion of this seismic isolation structure at the time of an earthquake. Similarly, (a) is explanatory drawing which shows the other aspect of this seismic isolation structure, (b) is explanatory drawing which shows the motion of this seismic isolation structure at the time of an earthquake.

Explanation of symbols

1, 1a, 1b Support plate 2 Base plate 3 Moving body 4 Upper support 5 Lower support 6a Upper guide groove (dent)
6b Lower guide groove (dent)
7a, 7b Wheel 9 Base body 11 Air cushion (buffer member)
12 Coil spring (buffer member)
14a, 14b Running track surface G Ground K Building R Gradient

Claims (3)

A movable body (3) is interposed between the support plate (1, 1a, 1b) supporting the building (K) and the base plate (2) supported by the ground (G),
The upper support (4, 4) is opposed to the bottom surface of the support plate (1, 1a, 1b), and the upper support (4, 4) is opposed to the top surface of the base plate (2). The lower support (5, 5) is provided at each location,
The upper support (4, 4) has an upper guide, and the lower support (5, 5) has a lower guide,
The movable body (3) has a pair of left and right wheels (7a, 7a) on the upper side of the base body (9), and a pair of front and rear wheels (7b, 7b) on the lower side. 3) The upper wheels (7a, 7a) of the pair of wheels (7a, 7a) can travel in the front-rear direction along the upper guide, and are recessed (6a) at a position opposite to the traveling track surface (14a) of the pair of wheels (7a, 7a). , 6a), and the lower wheels (7b, 7b) can travel in the front-rear direction along the lower guide, and the traveling raceway surface (14b) of the pair of wheels (7b, 7b). A seismic isolation structure for a building, wherein depressions (6b, 6b) are formed at opposing positions.   2. The seismic isolation structure for a building according to claim 1, wherein the depressions (6a, 6a, 6b, 6b) are provided with valley-folded or mountain-shaped gradients (R, R). A buffer member (11, 12) is interposed between the building (K) and the support plate (1) or between the support plates (1a, 1b) divided in the vertical direction. Item 1. A seismic isolation structure for a building.

Images