JP5969316B2 - Seismic isolation building - Google Patents

Description

  The present invention mainly relates to a seismic isolation building having a seismic isolation layer equipped with a seismic isolation device.

  Seismic isolation buildings include so-called basic seismic isolation with a seismic isolation device between the foundation and the building, and so-called intermediate floor seismic isolation with a seismic isolation device on the intermediate floor. A space (clearance) that takes into account the maximum amount of displacement of the building due to rolling is secured around the entire seismic isolation building. For example, in the case of a normal basic seismic isolation building, the seismic isolation clearance is about 500 to 700 mm corresponding to the magnitude of deformation of the seismic isolation layer.

JP 2011-140759 A

  However, if an unexpected earthquake occurs, the building may be displaced beyond the allowable range, and damage may be caused by this excessive displacement.

  In addition, torsional deformation may occur in the base-isolated building due to an earthquake, and in particular, in a large base-isolated building exceeding 100 m both vertically and horizontally, the amount of displacement at the corner (end) of the building due to torsional deformation can increase significantly. For example, in a base-isolated building having a building area of 100 m square, even if the twist angle is only 1 °, the corner of the building may be displaced by about 1.75 m depending on the center position of the twist. Therefore, such a large-scale base-isolated building can be displaced beyond the allowable range even by a small and medium-sized earthquake.

  Here, in the intermediate floor seismic isolation building disclosed in FIG. 10 of Patent Document 1, the lower end portion of the elevator shaft supported by being suspended on the upper floor penetrates the seismic isolation layer below the upper floor, and further below that Enter the recess at the top of a lower floor.

  In such an intermediate floor seismic isolation building, when the seismic isolation device is deformed during an earthquake and the upper and lower floors move relative to each other in a horizontal direction by a predetermined value or more, the lower end of the elevator shaft and the wall surface of the recess (inner peripheral surface ) And hit. That is, the lower end portion and the concave portion of the elevator shaft constitute a movement amount regulating device, and a certain effect of suppressing the horizontal relative movement amount between the upper floor and the lower floor can be obtained by this movement amount regulating device. . And this movement amount control apparatus can also be provided between a foundation and a lower floor instead of an intermediate floor.

  However, if the elevator shaft is located near the outer periphery of the seismic isolation building, it may be impossible to construct a recess for receiving the lower end of the elevator shaft on the foundation side or lower floor side due to space limitations. The foundation or lower floor needs to be expanded, which may increase costs.

  The present invention has been made in consideration of the above-described matters, and an object of the present invention is to provide a seismic isolation building that can easily suppress an excessive displacement of the building in the horizontal direction at a low cost.

  In order to achieve the above object, the base-isolated building according to the present invention includes a plurality of elevator pits projecting into the base isolation layer in the upper part of the structure part sandwiching the base isolation layer from above and below. The lower structure is provided with a plurality of stoppers for restricting horizontal movement of each elevator pit over a predetermined distance, and the stopper restricts only horizontal movement in a predetermined direction for at least some elevator pits. In addition, the horizontal movement in a direction in which any one of the elevator pits is not restricted is arranged to restrict the at least one other elevator pit (claim 1).

  In the base-isolated building, there is one or more elevator pits arranged at the corners of the base isolation layer, and the stopper is not positioned outside the base isolation layer than the elevator pits arranged at the corners. (Claim 2).

  In the above base-isolated building, the stopper is constituted by a protrusion that is integrated with the lower structure part and protrudes into the base isolation layer, and a shock absorber that is supported by the protrusion toward the elevator pit. (Claim 3).

  In the present invention, it is possible to obtain a base-isolated building that can easily suppress an excessive displacement of the building in the horizontal direction at a low cost.

  In other words, in the seismic isolation building of the invention according to each claim of the present application, the elevator pits are not restrained individually by providing stoppers on the entire periphery of each elevator pit, but in total in all directions of each elevator pit by all stoppers. Therefore, simplification of the stopper structure, space saving, and cost reduction can be achieved at the same time.

  In addition, the elevator pit itself is naturally constructed in terms of structure. Therefore, in order to carry out the present invention, it is only necessary to provide an extra stopper on the base-isolated building, and therefore the present invention is easy and inexpensive. Can be implemented.

  Nevertheless, excessive horizontal movement of the seismically isolated building from front to back and from side to side is surely regulated by a plurality of reaction force bearing structures comprising a combination of an elevator pit and a stopper.

  Moreover, the fact that a plurality of reaction force bearing structures are distributed in the seismic isolation layer is also advantageous in the following points. In other words, the reaction force bearing structure located at a position away from the rigid center of the building, which is the axis of torsional deformation, can generate a greater moment against the torsional deformation (see FIG. 3). In the present invention, since a plurality of reaction force bearing structures are distributed, at least one reaction force bearing structure is located away from the rigid core, regardless of the position of the rigid core. Therefore, excessive torsional deformation of the seismic isolation building can be well controlled by multiple reaction force bearing structures, and it is possible to achieve both reduction of the seismic isolation clearance and ensuring safety by reducing the amount of torsional deformation. It becomes.

  In the base-isolated building of the invention according to claim 2, the stopper is arranged so as not to be located outside the base isolation layer from the elevator pit, and therefore the stopper does not protrude outside the base isolation layer. There is no need for additional expansion work, etc., and effective use of the site area can be achieved.

  In the seismic isolation building of the invention according to claim 3, the following effects are obtained. That is, the stopper is narrower than the elevator pit, and assuming that the elevator pit and the stopper are horizontally moved relatively back and forth and left and right, if the shock absorber is provided on the elevator pit side, the shock absorber is the stopper. If the width of the shock absorber is wider than the stopper to avoid this, the stopper may collide with the part of the elevator pit where the shock absorber is not provided. With the disadvantage of becoming. However, in the present invention, since the shock absorber is provided on the stopper side, it is not necessary to increase the size of the shock absorber as described above.

It is the schematic of the seismic isolation layer of the base isolation building which concerns on one embodiment of this invention. It is a longitudinal cross-sectional view which shows schematically the structure of the principal part of the said seismic isolation building. It is explanatory drawing which shows roughly the relationship between the distance from the rigid center of the reaction force burden structure of the said seismic isolation building, and the generated moment.

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

  In the base-isolated building according to the present embodiment, as shown in FIG. 2, the elevator projecting into the base isolation layer 1 in the upper structure portion 2 among the top and bottom structure portions 2 and 3 sandwiching the base isolation layer 1 from above and below. A pit 4 is disposed, and a stopper 5 that restricts horizontal movement of the elevator pit 4 beyond a predetermined distance is provided in the lower structure portion 3.

  The base-isolated building of this embodiment is either a so-called basic base isolation in which the base isolation layer 1 is formed between the foundation and the lower end of the building, or a so-called intermediate floor base isolation in which the base isolation layer 1 is formed on the intermediate floor. May be. Therefore, the lower structure portion 3 referred to in the present embodiment means a basic case in the case of basic seismic isolation, and means a lower case than the base isolation layer 1 in the case of intermediate floors. become.

  As shown in FIG. 1, the base isolation layer 1 includes a plurality of base isolation devices (base isolation materials) D made of laminated rubber or the like.

  Further, a plurality of elevator pits 4 are dispersedly arranged in the upper structure portion 2, and as shown in FIG. 1, in this embodiment, the four corner portions of the seismic isolation layer 1 having a substantially rectangular shape in plan view. One elevator pit 4 is arranged in each.

  As shown in FIG. 2, the stopper 5 is integrated with the lower structure 3 and protrudes into the seismic isolation layer 1, and the shock absorber 7 supported by the protrusion 6 toward the elevator pit 4. And is composed of. As the shock absorbing material 7, for example, a commercially available fender can be used.

  In the present embodiment, two stoppers 5 are provided for each of the four elevator pits 4 in total, and the reaction force bearing structure 8 is configured by the set of the elevator pits 4 and the stoppers 5. 8 includes stoppers 5 only on two sides close to the center of the building among the four sides (front and rear, left and right) of the elevator pit 4.

  Specifically, the elevator pit 4 of the reaction force bearing structure 8A on the upper left in FIG. 1 is restricted to move rightward and downward by the stopper 5, and is not restricted to leftward and upward movement. On the other hand, the elevator pit 4 of the reaction force bearing structure 8B located at the lower right of FIG. 1 (on the opposite side of the reaction force bearing structure 8A) is restricted by the stopper 5 from moving leftward and upward. Movement is not regulated.

  Further, the elevator pit 4 of the reaction force bearing structure 8C in the lower left of FIG. 1 is restricted to move rightward and upward by the stopper 5, and is not restricted to leftward and downward movement. On the other hand, the elevator pit 4 of the reaction force bearing structure 8D at the upper right in FIG. 1 (on the opposite side of the reaction force bearing structure 8C) is restricted to move leftward and downward by the stopper 5, and moves rightward and upward. Is not regulated.

  Thus, a plurality of (in this embodiment, a total of eight) stoppers 5 are provided to restrict only horizontal movement in a predetermined direction for at least some elevator pits 4 (all elevator pits 4 in this embodiment), And it arrange | positions so that the horizontal movement to the direction which is not restrict | limited about any one elevator pit 4 may be controlled about at least one other elevator pit 4.

  Therefore, in the present embodiment, the stoppers 5 are not provided on the four sides (the entire circumference) of each elevator pit 4 to restrain the elevator pits 4 individually. Since the movement restriction in the direction) is performed, the structure of the stopper 5 can be simplified, space saving, and cost reduction can be achieved at the same time.

  Further, the stopper 5 is arranged so as not to be located outside the seismic isolation layer 1 relative to the elevator pit 4, and therefore the stopper 5 does not protrude outside the seismic isolation layer 1. No expansion work is required and effective use of the site area can be achieved.

  Moreover, the elevator pit 4 itself is naturally constructed in terms of structure, and therefore, it is only necessary to provide an extra stopper 5 in order to implement this embodiment, and therefore this embodiment is easy at low cost. Can be implemented.

  Nevertheless, excessive horizontal movement of the seismically isolated building from front to back and from side to side is surely regulated by a plurality of (four in this embodiment) reaction force bearing structures 8.

  Moreover, the fact that the plurality of reaction force bearing structures 8 are distributed in the seismic isolation layer 1 is also advantageous in the following points. That is, as shown in FIG. 3, the reaction force bearing structure 8 located at a position away from the rigid center C of the building, which is the axis of torsional deformation, can generate a larger moment against the torsional deformation. In the present embodiment, since the plurality of reaction force bearing structures 8 are dispersedly arranged, at least one (minimum of three in this embodiment) reaction force bearing structures, regardless of where the rigid core C is located. 8 is located away from the rigid center C. Therefore, excessive torsional deformation of the base-isolated building can be well controlled by the plurality of reaction force bearing structures 8, and as a result, the amount of torsional deformation is reduced. It is also possible to reduce seismic isolation clearance and ensure safety.

  Further, in the present embodiment, as shown in FIG. 1, the stopper 5 is smaller than the elevator pit 4, and it is assumed that the elevator pit 4 and the stopper 5 move horizontally relative to the front, rear, left and right. Therefore, if the shock absorber 7 is provided on the elevator pit 4 side, if the shock absorber 7 has the same width as the stopper 5, the stopper 5 collides with a portion of the elevator pit 4 where the shock absorber 7 is not provided. There is a possibility, and if the shock absorber 7 is made wider than the stopper 5 to avoid this, there is a demerit that the shock absorber 7 is enlarged. However, in the present embodiment, the shock absorber 7 is provided on the stopper 5 side, so that it is not necessary to increase the size of the shock absorber 7 as described above. However, it is needless to say that the stopper 5 may be equal to or larger than the elevator pit 4.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  The present invention can be applied to any scene of new construction or renovation of a seismic isolation building.

  Each elevator pit 4 is not limited to the one arranged at the corner of the seismic isolation layer 1, and may be provided at the center of the seismic isolation layer 1, for example. However, the reaction force bearing structure 8 composed of the set of the elevator pit 4 and the stopper 5 is a position as far as possible from the rigid center of the building in order to suppress both torsional deformation and horizontal displacement of the seismic isolation building, And it is desirable to be in the position as far as possible in the X and Y directions in the horizontal plane from the other reaction force bearing structure 8. Therefore, when there are three or more elevator pits 4, it is not necessary to provide the stoppers 5 for all of them, and the stoppers 5 may be provided only for two or more elevator pits 4 that satisfy the above conditions. Good. For example, in the example shown in FIG. 1, only the upper left reaction force bearing structure 8A and the lower right reaction force bearing structure 8B are used, or only the lower left reaction force bearing structure 8C and the upper right reaction force bearing structure 8D. Can be used.

  In the above embodiment, only the horizontal movement in a predetermined direction is restricted for all the elevator pits 4. However, the present invention is not limited to this. For example, some elevator pits 4 are directed in the front-rear and left-right directions (omnidirectional). The horizontal movement may be restricted.

  You may make it provide the impact-absorbing material 7 which comprises the stopper 5 also in the outer periphery of a building, or the inner periphery of a retaining wall.

  Needless to say, the modifications described in the above embodiment and thereafter may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Seismic isolation layer 2 Upper structure part 3 Lower structure part 4 Elevator pit 5 Stopper 6 Protrusion part 7 Shock absorber 8 Reaction force bearing structure (8A-8D)
C Goshin D Seismic isolation device

Claims (3)

Among the structural parts sandwiching the base isolation layer from above and below, a plurality of elevator pits projecting into the base isolation layer are dispersedly arranged in the upper structure part, and the lower structure part has a predetermined distance or more of each elevator pit. There are multiple stoppers that regulate the horizontal movement of the
The stopper restricts only horizontal movement in a predetermined direction for at least some of the elevator pits, and performs horizontal movement in a direction not restricted for any one of the elevator pits for at least one other elevator pit. A seismically isolated building characterized by being arranged to regulate.   There is one or more elevator pits arranged at the corners of the base isolation layer, and the stopper is arranged so as not to be positioned outside the base isolation layer than the elevator pits arranged at the corners. The base-isolated building according to claim 1. The stopper is constituted by a projecting portion integrated into the lower structure portion and projecting into the seismic isolation layer, and an impact absorbing material supported by the projecting portion toward the elevator pit. The base-isolated building described in 1.

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