JP2016125269A - Aseismic structural body, and support structure for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aseismic structural body of a simple configuration that inhibits residual displacement.SOLUTION: An aseismic structural body 1 is interposed between a ground G and a foundation B of a building. The aseismic structural body includes a lower layer sandbag part 4 having a conical, polygonal pyramid-shaped, or dome-shaped recess 41 formed on a top surface disposed on a ground side, a slip surface part 3 formed on a surface of the recess, and a movable sandbag part 2 of which a bottom surface 22 comes in contact with the slip surface part. When the lower layer sandbag part fluctuates due to ground vibration, a top surface 21 of the movable sandbag part is displaced relatively with regard to the lower layer sandbag part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seismic reduction structure and a building support structure for reducing the propagation of ground vibrations generated by an earthquake or vehicle traffic to a building.

  If the ground motion is propagated from the ground to the building as it is, the building shakes greatly, so even if the building itself is not damaged, furniture and fixtures move and fall down, making it dangerous for people indoors There is a risk of being placed in.

  For this reason, various seismic isolation structures and damping structures have been developed in order to suppress the shaking of buildings due to earthquake motion. Patent Document 1 discloses a seismic reduction structure in which a sandbag is laminated between the ground and the foundation of a building.

  Patent Document 2 discloses a seismic isolation device installed between the foundation and the bottom of the building. By placing the building on the seismic isolation device with extremely low frictional resistance, the seismic motion transmitted from the ground to the foundation of the building is not transmitted to the building, and the shaking of the building can be suppressed.

  Further, Patent Document 3 discloses a building ground structure in which sliding bodies made of plate-like resin foams are laminated and capable of suppressing earthquake motion. The sliding bodies stacked above and below are connected by a restoration assisting member made of a columnar elastic body such as rubber.

Japanese Patent No. 5196059 Japanese Patent No. 48488989 JP 2012-1994

  However, in the case of using a seismic reduction structure in which sandbags are laminated, if there is no mechanism for returning to the original position after displacement due to earthquake motion, a large residual displacement may occur.

  On the other hand, the seismic isolation devices and the like disclosed in Patent Documents 2 and 3 have very small frictional resistance, so that they do not move with wind pressure or small vibrations, or the displacement is not too large. It is necessary to provide a fixing device, a stopper, a restoration assisting member, and the like separately to form a complicated configuration.

  Moreover, since the seismic isolation apparatus like patent document 2 is installed between the foundation and the bottom face of a building, it must be reinforced, such as providing a frame on the bottom face of the building. It's too hard to be adopted.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic reduction structure and a building support structure that are less likely to cause residual displacement and can be simply configured.

  In order to achieve the above object, a vibration-reducing structure according to the present invention is a vibration-reducing structure interposed between a ground and a foundation of a building, and has a conical shape and a polygonal pyramid on an upper surface disposed on the ground side. And a dome-shaped recessed portion, a smooth surface portion formed on the surface of the recessed portion, and a movable soil pad portion that makes the lower surface contact the smooth surface portion, and the lower receiving portion by vibration of the ground When the distance fluctuates, the upper surface of the movable sandbag portion is displaced relative to the lower receiving portion.

  Here, it is preferable that the lower surface of the movable sandbag has a larger area than the upper surface. For example, the lower surface of the movable sandbag can be protruded downward.

  In addition, the rigidity of the smooth surface portion integrated with the concave portion can be made larger than the rigidity of the movable soil covering portion.

  And the support structure of the building of this invention was equipped with the some earthquake-proof structure in any one of the above in the downward direction of the foundation of the said building. Moreover, it can comprise by the some damping structure as described in any of the above, and the shock absorbing material arrange | positioned at the side of the said damping structure.

  Furthermore, it can also be set as the structure provided with the some vibration reduction structure in any one of the said, and the reinforcement part formed in the ground under the said vibration reduction structure.

  The seismic reduction structure of the present invention configured as described above is interposed between the ground and the foundation of the building, and a movable earthen ridge is provided in the lower receiving part in which a conical, polygonal pyramid or dome-shaped recess is formed. It becomes a laminated structure.

  In addition, the lower surface of the movable sandbag portion is in contact with the smooth surface portion formed on the surface of the concave portion, and when the receiving portion fluctuates due to vibration such as an earthquake, the upper surface of the movable soilbag portion is relative to the lower receiving portion. It is the composition which is displaced to.

  Then, when the vibration direction is reversed or the vibration stops, the restoring force that tries to return to the original position is applied to the movable soil cave portion that has moved within the conical, polygonal pyramid, or dome-shaped recess. For this reason, it is difficult for residual displacement to occur, and a simple configuration can be achieved.

  In this way, the movable sandbag portion having a high restoring force in the recess can be easily formed by making the area of the lower surface wider than the upper surface. Specifically, the area can be widened by projecting the lower surface of the movable sandbag portion downward.

  In addition, by making the rigidity of the smooth surface part integrated with the concave part larger than the rigidity of the movable soil part, local deformation of the smooth surface part during movement of the movable soil part can be suppressed. Can be easily slid or deformed.

  Furthermore, in the building support structure of the present invention, a cushioning material is arranged on the side of the vibration-reducing structure. For this reason, it is difficult to prevent the displacement of the movable soil covering portion, and the movable soil retaining portion is easily returned to the original position by the restoring force of the cushioning material.

  In addition, if the building can identify the position where a large load is applied, it is possible to economically add a seismic-reducing function to weak ground by providing a reinforcement only on the ground where the seismic-reducing structure is located. Will be able to.

It is the disassembled perspective view which showed schematic structure of the seismic-reduction structure of this Embodiment. It is a figure explaining the effect | action of a seismic-reduction structure, (a) is the figure which showed the initial state, (b) is the figure which showed the state which the bottom part of the lower soil moved to the right direction, (c) is the lower soil It is the figure which showed the state which the part moved to the left direction. It is sectional drawing which showed the structure of the support structure of the building where the seismic-reduction structure of this Embodiment is arrange | positioned. It is a figure for demonstrating the shear characteristic of a seismic-reduction structure. It is a figure explaining the relationship between the wind pressure which acts on a house, and the self-weight considered, (a) is a schematic diagram at the time of arrange | positioning a seismic isolation apparatus, (b) is the seismic-reduction structure of this Embodiment It is a schematic diagram at the time of arranging. It is explanatory drawing which showed typically the support structure of the building of 3 patterns in which the seismic-reduction structure demonstrated in Example 1 is arrange | positioned. It is explanatory drawing which showed typically the support structure of the building of another 3 pattern in which the seismic-reduction structure demonstrated in Example 1 is arrange | positioned. It is explanatory drawing which showed the structure of the seismic-reduction structure of Example 2, Comprising: (a) is a disassembled perspective view, (b) is a side view. It is explanatory drawing which showed the structure of the support structure of the building where the earthquake-reduction structure of Example 2 is arrange | positioned. It is a figure explaining operation | movement of the seismic-reduction structure of Example 2. FIG. It is sectional drawing which showed the structure of the support structure of the building by which the seismic-reduction structure is arrange | positioned on the surface layer ground improvement part of Example 3. FIG. It is sectional drawing which showed the structure of the support structure of the building by which the vibration reduction structure was arrange | positioned on the columnar ground improvement part of Example 3. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a schematic configuration of a vibration reducing structure 1 according to the present embodiment. Moreover, FIG. 3 is sectional drawing which showed the structure of the support structure of the building in which the earthquake-proof structure 1 is arrange | positioned.

  The seismic attenuation structure 1 and the building support structure of the present embodiment are constructed between the foundation B of a building such as a house or a small-scale apartment house and the ground G. In FIG. 3, a plurality of vibration-reducing structures 1,... Are arranged on the excavated ground G, and crushed stone B1 is spread thereon. And foundation B, such as a solid foundation, is built on crushed stone B1, and house H as a building is built on the foundation B.

  First, the structure of the vibration reduction structure 1 will be described. As shown in FIG. 1, the seismic attenuation structure 1 includes a lower soil crust 4 as a receiving portion having a recess 41 formed on the upper surface, a smooth surface portion 3 formed on the surface of the recess 41, It is mainly comprised by the movable earthen part 2 laminated | stacked.

  The lower sandbag 4 is a sandbag arranged on the lower side, in other words, on the ground G side. The lower soil cave portion 4 is formed by filling a granular sandbag such as sand into a flat sandbag having a substantially rectangular shape (including a square) in plan view.

  The concave portion 41 of the lower soil cave portion 4 is formed in a conical shape, a polygonal pyramid shape, or a dome shape. For example, when the gradient θ of the recess 41 is linear as shown in FIG. 2A, the recess 41 has a conical or polygonal pyramid shape. On the other hand, if the slope of the recess 41 is a curved line having a curvature, it becomes a dome shape.

  The sandbag is made of a woven fabric with high tensile strength woven with synthetic resin fibers such as polypropylene resin fibers. Moreover, the part which becomes the recessed part 41 of a sandbag is loosened and shape | molded downward.

  As shown in FIG. 1, the smooth surface portion 3 is formed into a conical shape, a polygonal pyramid shape, or a dome shape by a steel plate having a small friction coefficient such as stainless steel. Moreover, the smooth surface part 3 can also be formed with the sheet | seat made from a tetrafluoroethylene.

  Furthermore, the surface of the sandbag can be coated with a fluororesin or ceramic to form the smooth surface portion 3. Moreover, the smooth surface part 3 can also be formed by combining a sheet material, a coating material, and a steel plate.

  The concave portion 41 of the lower soil claw portion 4 is deformed in accordance with the shape of the lower surface of the smooth surface portion 3, so that the smooth surface portion 3 comes into close contact with the concave portion 41 and becomes integrated. That is, if the soil is filled with granular filler, it can be deformed following the shape of the pressed object.

  Then, the lower surface 22 of the movable soil covering portion 2 is brought into contact with the smooth surface portion 3. The movable sandbag 2 is a sandbag arranged on the upper side, in other words, on the house H side. The movable sandbag portion 2 is formed by filling a flat sandbag bag having a substantially rectangular shape (including a square) in plan view with a granular filler such as sand.

  The lower surface 22 of the movable sandbag portion 2 protrudes downward. For this reason, the area of the lower surface 22 is larger than that of the upper surface 21 of the movable sandbag 2. FIG. 2A shows a cross section of the vibration-reducing structure 1 in which the lower soil cradles 4, the smooth surface portions 3, and the movable soil cradles 2 are stacked from the bottom.

  Next, the effect | action of the earthquake-reduction structure 1 of this Embodiment is demonstrated, referring FIG.

  At the beginning of the construction of the house H, as shown in FIG. 2 (a), it is in an initial state in which the movable soil cuff portion 2 is arranged directly above the lower soil cough portion 4. In this initial state, the lower surface 22 of the movable soil covering portion 4 is in close contact with the entire surface of the smooth surface portion 3.

  Further, the loading load such as the house H and the foundation B enters from the upper surface 21 of the movable soil couch 2 and is transmitted as it is to the smooth surface portion 3 and the lower soil couch 4 below. This transmission of the overload is stably continued even when a displacement described later is occurring.

  On the contrary, the vibration generated in the ground G due to the passage of the vehicle or the like is attenuated by a filler such as sand filled in the lower soil cave portion 4 and the movable soil cave portion 2 and transmitted to the foundation B.

  Then, when a large earthquake occurs and the ground motion is propagated to the ground G around the house H, the horizontal force of the ground motion causes the subsoil portion 4 to move to the right as shown in FIG. 2B, for example. Move to.

  Here, even if the subsoil part 4 moves in the right direction, the movable soil part 2 having the bottom surface 22 in contact with the smooth surface part 3 does not follow the movement of the subsoil part 4 and remains in place. Become.

  As a result, the upper surface 21 of the movable soil slag portion 2 is displaced relative to the lower soil slag portion 4. And the earthquake motion is not transmitted to the house H on the movable sandbag portion 2 that does not follow the movement of the lower sandbag portion 4 or is transmitted after being reduced.

  Here, when the smooth surface portion 3 is formed in a horizontal plane, this relative displacement may become a residual displacement. On the other hand, if the smooth surface portion 3 is formed in a conical shape, a polygonal pyramid shape or a dome shape with the center being the lowest point, the movable soil covering portion 2 is in an initial state (see FIG. 2A). The resilience to return will work.

  Furthermore, as shown in FIG. 2 (c), even when the seismic motion such that the subsoil part 4 moves leftward, the subsoil part 4 moves leftward without being constrained by the movable soil part 2. In other words, a relative displacement in the opposite direction occurs between the upper surface 21 of the movable sandbag 2 and the lower sandbag 4.

  In this way, the movable soil couch portion 2 placed on the smooth surface portion 3 having a small frictional resistance and a depressed center is slidable or freely deformed like a fluid, so that it is relative to the lower soil crust portion 4. However, the seismic motion propagated to the house H can be reduced.

  In addition, the state in which the relative displacement is generated between the upper surface 21 of the movable sandbag 2 and the lower sandbag 4 is not stable, and the movable sandbag 2 always tries to return to the initial state. The occurrence of residual displacement can be suppressed.

  FIG. 3 illustrates an example in which a plurality of vibration-reducing structures 1,... As described above, the seismic reduction structure 1 is displaced in the horizontal direction when subjected to earthquake motion. Therefore, the outer shock absorbing portion 5 is provided as a shock absorbing material from the outer peripheral side surface of the foundation B to the side surface of the movable soil covering portion 2.

  A material having a restoring force such as polystyrene foam (foamed polystyrene, EPS) or the like can be used for the outer peripheral buffer portion 5. That is, when the movable earth couch 2 moves due to the earthquake motion, the movable earth chamfer 2 arranged at the outermost edge pushes the outer periphery buffering part 5.

  At this time, since the outer periphery buffering part 5 does not hinder the movement of the movable sandbag part 2, it does not deteriorate the vibration reducing function of the vibration reducing structure 1. And the pushed-in outer periphery buffer part 5 will help the movable earth capping part 2 to return to an original position with a restoring force.

  The shear characteristics of the vibration-reducing structure 1 as described above can be set as shown in FIG. 4, for example. This figure shows the relationship between the shear displacement of the seismic reduction structure 1 and the shear force coefficient.

  In the case of a normal object, the shearing force coefficient increases as the shear displacement increases. However, in the vibration-reducing structure 1, the smooth surface portion 3 is provided between the lower soil cave portion 4 and the movable soil cave portion 2. Since it is interposed, the shear displacement can be increased while maintaining a substantially constant shear force coefficient.

  Such shear characteristics can be adjusted to desired characteristics by changing the material (friction coefficient) of the smooth surface portion 3, the angle of the gradient θ of the smooth surface portion 3, and the like.

  Then, by multiplying the shearing force coefficient by the weight acting from above, the resistance force against the horizontal force can be calculated. FIG. 5 is a diagram schematically illustrating the house H on which the wind pressure W acts.

  Fig.5 (a) has shown the state by which the seismic isolation apparatus a was arrange | positioned. Since the seismic isolation device a is disposed between the bottom surface of the house H and the top surface of the foundation B, the weight of the foundation B cannot be taken into account as an upper load for calculating the shear resistance.

  On the other hand, if it is a building support structure 10 constituted by the vibration-reducing structures 1,... Of the present embodiment, it is disposed under the foundation B as shown in FIG. In addition to the house H, the weight of the foundation B can be added as an overload for calculating the shear resistance.

  For this reason, if it is the support structure 10 of the building where a plurality of seismic structures 1,... Are arranged, it is possible to counter strong wind pressure W such as typhoon without providing a special fixing device. Is possible.

  The seismic reduction structure 1 of the present embodiment configured as described above is interposed between the ground G and the base B of the house H, and is a lower layer in which a conical, polygonal or dome-shaped concave portion 41 is formed. A structure in which the movable sandbag part 2 is laminated on the sandbag part 4 is obtained.

  Further, the lower surface 22 of the movable soil couch 2 is in contact with the smooth surface portion 3 formed on the surface of the recess 41, and when the lower soil cough 4 changes due to vibrations such as an earthquake, the upper surface 21 of the movable soil couch 2 becomes the lower layer. It is the structure displaced relatively with respect to the earthen part 4.

  And the restoring force which tries to return to the original position will act on the movable sandbag part 2 which moved in the conical, polygonal pyramid or dome-shaped recess 41 when the vibration direction is reversed or the vibration stops. For this reason, it is difficult for residual displacement to occur, and a simple configuration can be achieved.

  As described above, the movable earth capping portion 2 having a high restoring force in the recess 41 can be easily manufactured by making the area of the lower surface 22 wider than that of the upper surface 21. Specifically, the area can be widened by projecting the lower surface 22 of the movable sandbag portion 2 downward.

  Further, by making the rigidity of the smooth surface portion 3 integrated with the concave portion 41 larger than the rigidity of the movable soil couch portion 2, local deformation of the smooth surface portion 3 during movement of the movable soil cave portion 2 can be suppressed. It is possible to make it easy to slide or deform the movable sandbag 2 on the top 3.

  Here, since it is “the rigidity of the smooth surface portion 3 integrated with the concave portion 41”, the rigidity can be increased only by the smooth surface portion 3, and the rigidity can be increased only by the concave portion 41. For example, when the smooth surface portion 3 is formed of a stainless steel plate, the “rigidity of the smooth surface portion 3 integrated with the concave portion 41” increases even if the rigidity of the lower soil crust portion 4 is small. Note that the case where the rigidity is increased only by the recess 41 will be described later in the embodiment.

  Further, in the building support structure of the present embodiment, the outer periphery buffering portion 5 is disposed on the side of the vibration-reducing structure 1. For this reason, the displacement of the movable soil clogging part 2 is not easily disturbed, and the movable soil clogging part 2 is easily returned to the original position by the restoring force of the outer peripheral buffer part 5.

  Hereinafter, the arrangement pattern of the vibration damping structure 1 of the above-described embodiment will be described with reference to FIGS. The description of the same or equivalent parts as the contents described in the above embodiment will be described with the same terms or the same reference numerals.

  The arrangement pattern of the vibration-reducing structure 1 described with reference to FIG. 3 of the above embodiment is schematically shown in FIG. 6A. Here, the subsoil portion 4 is shown as a rectangle with a horizontal line pattern, the slanted cross section line is put into the smooth surface portion 3, and the movable soil portion 2 is shown as a rectangle with a vertical line pattern.

  On the other hand, in FIG. 6B, the seismic structures 1,... Are arranged on the entire surface below the foundation B, but a sandbag 6A is arranged between each of the earthquake damping structures 1 and the foundation B. At the same time, a sandbag 6B is also arranged below each of the vibration-reducing structures 1. The sandbags 6A and 6B are shown as white rectangles.

  The sandbags 6A and 6B are formed by filling a flat sandbag bag having a substantially rectangular shape (including a square) in plan view with a granular filler such as sand. By disposing the sandbags 6A and 6B above and below the vibration-reducing structure 1, the soft soil or the like below the foundation B can be replaced with good-quality sand (filler).

  In addition, since the number of stacks of sandbags (1, 6A, 6B) below foundation B increases, the distance that traffic vibrations pass through the sandbags increases, so the amount of vibration reduction increases and the seismic reduction effect increases. Can do.

  The base B illustrated in FIG. 6C is provided with a rib portion B2 that protrudes downward along the outer edge. Therefore, as compared with the arrangement pattern of FIG. 6B, the upper sandbags 6A,... Are arranged only at the locations excluding the position of the rib portion B2.

  Subsequently, in the arrangement pattern shown in FIG. 7A, a stack of sandbags 6A and 6B is arranged between the vibration-reducing structures 1 and 1 arranged at intervals in the horizontal direction. In this way, a pattern in which the vibration-reducing structures 1,.

  Further, in the arrangement pattern shown in FIG. 7 (b), the lowermost clay pads 6B are arranged alternately. For example, it is possible to omit installation of the bottom sandbag 6B at a place where the soil quality in the deep part of the ground G is good.

  In addition, when a substantially uniform load is applied from the foundation B such as a solid foundation, it may be sufficient to secure a supporting force with an area average, and therefore the bottom clay pads 6A and 6B can be omitted at equal intervals. .

  Furthermore, as shown in FIG.7 (c), it can also be set as the pattern by which the laminated body of the sandbag 6B, the seismic-reduction structure 1, and the sandbag 6A is arrange | positioned at intervals in a horizontal direction. Thus, a laminated body (6A, 1, 6B) can also be arrange | positioned in pile shape.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, a vibration-reducing structure 1A according to Example 2 in a form different from the above-described embodiment will be described with reference to FIGS. The description of the same or equivalent parts as the contents described in the above embodiment will be described with the same terms or the same reference numerals.

  As shown in FIG. 8, the seismic attenuation structure 1 </ b> A of the second embodiment includes a lower rigid body portion 7 as a receiving portion having a recess 71 formed on the upper surface, and a smooth surface portion 3 </ b> A formed on the surface of the recess 71. , And mainly composed of a movable earth capping portion 2A laminated thereon.

  The lower rigid portion 7 can be formed of a highly rigid material such as concrete, steel, or stone. For example, reinforced concrete can be formed into a rectangular parallelepiped shape with the outer edge 72 raised on the upper surface.

  As shown in FIG. 8A, a conical, polygonal, or dome-shaped recess 71 is formed inside an outer edge 72 formed in a substantially rectangular shape (including a square) in plan view. Since the lower rigid portion 7 does not deform even when a load is applied from above, it is formed into an accurate shape unlike the concave portion 41 described in the above embodiment.

  The smooth surface portion 3A can be formed by coating with a fluororesin or ceramic because the recess 71 has a sufficiently high rigidity. Moreover, the structure which affixed sheet materials, such as a tetrafluoroethylene sheet, may be sufficient.

  On the other hand, as shown in FIG. 8 (b), the movable sandbag part 2A has a substantially rectangular shape (including a square) in the form of a flat sandbag with a size that can be accommodated inside the smooth surface part 3A. It is formed by filling a granular filler such as.

  FIG. 9 is an explanatory view showing, in an enlarged manner, the periphery of the vibration-reducing structure 1 </ b> A arranged under the foundation B of the house H. Intermediate shock-absorbing parts 8 and 8 as shock-absorbing materials are respectively arranged on the sides of the vibration-reducing structure 1A.

  For the intermediate buffer portion 8, a material having a restoring force such as polystyrene foam (foamed polystyrene, EPS) can be used. Here, since EPS is a raw material used as a lightweight embankment material, it can also be used for the position where the upper load is transmitted from the foundation B.

  If the movable sandbag portion 2 </ b> A is formed smaller than the lower rigid portion 7, a gap is generated between the upper surfaces of the intermediate buffer portions 8 and 8. Therefore, the upper surface of the intermediate buffer portions 8 and 8 is shielded by a lid portion 23 such as a steel plate.

  By closing the upper portion of the smooth surface portion 3A with the lid portion 23, it is possible to prevent sand, earth and sand from entering the smooth surface portion 3A and increasing the frictional resistance.

  FIG. 10 illustrates the movement of the seismic reduction structure 1A when seismic motion is applied. The center of the figure shows the initial state before the earthquake. And if an earthquake motion is transmitted to the lower rigid part 7, the three states of a figure will be repeated.

  Here, by making the size of the movable earth capping part 2A smaller than that of the lower layer rigid body part 7, the relative displacement amount of the upper surface 21 of the movable earth capping part 2A with respect to the lower layer rigid body part 7 can be increased.

  In other words, the movable sandbag portion 2 </ b> A can move relative to the lower rigid body portion 7 until it hits the outer edge 72 of the lower rigid body portion 7. The maximum amount of displacement increases as the size of the movable sandbag portion 2A decreases.

  In addition, when the movable sandbag portion 2A becomes smaller, it becomes easier to move in the smooth surface portion 3A. In short, the same effect as when the frictional resistance of the smooth surface portion 3A is reduced can be obtained.

  Furthermore, the movable sandbag portion 2A is more easily moved when the difference between the rigidity of the smooth surface portion 3A integrated with the recess 71 and the stiffness of the movable sandbag portion 2A is larger. That is, if the rigidity of the movable sandbag portion 2A is smaller, local deformation of the smooth surface portion 3A is suppressed during movement and the slip surface is held, so that a slippery state can be maintained.

  The seismic-reduction structure 1 </ b> A according to the second embodiment configured as described above can be adjusted so that the upper surface 21 of the movable sandbag portion 2 </ b> A can be easily displaced relative to the lower rigid body portion 7. Further, the magnitude of the displacement can be easily adjusted.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, an arrangement pattern different from the building support structure described in the above embodiment and Example 1 will be described with reference to FIGS. Note that the description of the same or equivalent parts as those described in the above embodiment or other examples will be given with the same terms or the same reference numerals.

  In the third embodiment, an arrangement pattern using the vibration reducing structure 1A described in the second embodiment will be described. In addition, the earthquake-reduction structure 1 demonstrated in the said embodiment is also applicable.

  The unit house UH as a building described in the third embodiment is a unit building in which the position of the pillar H1 is standardized. In short, the place where the column H1 is arranged is determined in advance, and since the position where the load acts by concentrating via the foundation B is also known, the vibration-reducing structure 1A is partially arranged with respect to that place. be able to.

  First, ground improvement is performed on the entire ground G below the foundation B as necessary. For example, when there is a soft ground on the surface layer, the surface ground improvement portion 91 is created by mixing cement-based solidified material or the like with the ground.

  And each of the vibration-reducing structures 1A,... Is installed at a position immediately below where the columns H1,. In addition to the position directly below the column H1, the vibration-reducing structure 1A can be installed at a position where it is known that the load acts in a concentrated manner.

  Subsequently, the intermediate buffer portion 8 is spread between the vibration-reducing structures 1A and 1A, and the crushed stone B1 is spread thereon. Moreover, the outer periphery buffer part 5 is installed along the outer periphery position of the foundation B. Furthermore, the foundation B, such as a solid foundation, is constructed by assembling a reinforcing bar on the crushed stone B1.

  Then, the unit house UH is completed by arranging the building units on the foundation B. The seismic reduction structures 1A,... Are arranged below the columns H1,.

  On the other hand, FIG. 12 illustrates a case where the columnar ground improvement portion 92 is created by the deep mixing method. The columnar ground improvement portion 92 is formed on the ground G where a desired supporting force cannot be obtained only by improving the surface layer.

  The columnar ground improvement unit 92 is provided on the ground G at a position where a load is applied in a concentrated manner, such as a position where the column H1 is disposed. And the 1 A of seismic-reduction structure body 1A is installed in the head of the columnar ground improvement part 92. FIG.

  If it is a building such as a unit house UH that can identify the position where a large load acts in this way, the seismic reduction structure 1A (1) can be arranged only at that position, so it is economical to take measures to reduce vibration. Can be applied.

  In addition, if the ground G at the position where the seismic isolation structure 1A (1) is installed is weak, it is economically reduced to the weak ground G by providing ground improvement or piles and other reinforcements only at the ground. A seismic function can be added.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment or example, and the design changes are within the scope of the present invention. Are included in the present invention.

  For example, in the above-described embodiments and examples, the case where the solid foundation is the foundation B of the building has been described. However, the present invention is not limited to this, and the present invention is also applicable when the cloth foundation or the independent foundation is the foundation of the building. The invention can be applied.

1, 1A Seismic Decreasing Structure 10 Building Support Structure 2, 2A Movable Soil Part 21 Upper Surface 22 Lower Surface 3, 3A Smooth Surface Part 4 Lower Soil Part (Underside)
41 Concave part 5 Outer peripheral buffer part (buffer material)
7 Lower rigid body part (underlay part)
71 Concave portion 8 Intermediate buffer portion (buffer material)
91 Surface ground improvement part (reinforcement part)
92 Columnar ground improvement part (reinforcement part)
G Ground B Building foundation H Housing (building)
UH unit housing (building)

Claims (7)

A seismic reduction structure interposed between the ground and the foundation of the building,
A conical portion in which a conical, polygonal pyramid or dome-shaped concave portion is formed on the upper surface disposed on the ground side;
A smooth surface formed on the surface of the recess;
A movable earth capping part that makes the lower surface contact the smooth surface part,
A seismic-reducing structure characterized in that when the under-loading part is fluctuated by vibration of the ground, the upper surface of the movable sandbag part is displaced relative to the under-receiving part.   The seismic attenuation structure according to claim 1, wherein the lower surface of the movable sandbag portion has a larger area than the upper surface.   The vibration-reducing structure according to claim 2, wherein a lower surface of the movable sandbag portion protrudes downward.   4. The vibration-reducing structure according to claim 1, wherein a rigidity of the smooth surface portion integrated with the concave portion is larger than a rigidity of the movable sandbag portion. 5.   5. A building support structure comprising a plurality of vibration reduction structures according to any one of claims 1 to 4 below a foundation of the building. A plurality of vibration-reducing structures according to any one of claims 1 to 4,
A building support structure comprising a cushioning material disposed on a side of the seismic reduction structure. A plurality of vibration-reducing structures according to any one of claims 1 to 4,
A building support structure comprising a reinforcing portion formed on a ground below the seismic reduction structure.