JP4568597B2 - Base isolation block and base isolation structure using the same - Google Patents

Description

  The present invention relates to a seismic isolation base block and a seismic isolation base structure using the same, and more particularly to reliably reduce vibration due to an earthquake or the like acting on a building or an exhibit while having an inexpensive structure. The present invention relates to a base-isolated base block characterized by a

Conventionally, as a means for protecting a building against vibration caused by an earthquake or the like, an earthquake-resistant structure that prevents collapse by building the building firmly has been mainstream. The earthquake-resistant structure makes it possible to avoid the collapse of buildings even if an earthquake occurs. However, even if the earthquake-resistant structure makes it possible to avoid the collapse of the building itself due to the earthquake, the furniture in the building falls down due to vibration. The fall of furniture, etc., as well as economic losses, can be life-threatening in some cases.
Therefore, the structure of buildings in recent years has shifted to a seismic isolation structure that can reduce vibrations acting on the buildings due to earthquakes and the like. In such a seismic isolation structure, a seismic isolation device that attenuates vibration from the ground is provided. In general, as a seismic isolation device, one having a damping means disposed between the ground and a building is widely known.
Japanese Patent Laid-Open No. 11-22242

  The seismic isolation device described in Patent Document 1 includes a swinging means such as a steel ball for allowing a building to move horizontally on a foundation, and a fluid cylinder for attenuating horizontal vibration of the building. This is a seismic isolation structure with damping means. However, such a conventional seismic isolation structure has a problem that the structure is complicated due to the use of damping means such as a fluid cylinder, and the manufacturing cost increases.

  An object of the present invention is to provide an isolation base block capable of reliably attenuating vibrations from the ground while having an inexpensive and simple structure, and an isolation base structure using the same.

In order to achieve the above object, the present invention comprises the following arrangement.
That is, a plate, a seismic isolation basic block in which a plurality of linear protrusion for attenuating the dynamic vibration on at least one surface of the upper and lower surfaces of the flat plate, which are disposed upright, the projection body, It is formed by a plurality of types of projecting body pieces having different elastic coefficients, and the projecting body pieces are formed in different lengths for each elastic coefficient, and the projecting body faces the ground surface. in a seismic isolation foundation block projection height of the projection body piece from said flat plate is characterized that you have been formed in the length that matches each in when installed.

The flat plate is formed in a unit plate shape having a predetermined size and shape, and a connecting portion for connecting adjacent flat plates is formed on the outer peripheral edge of the flat plate. And
Thereby, since an efficient seismic isolation base can be constructed, construction costs can be reduced.

Further, the flat plate is formed with a through-hole penetrating in the thickness direction of the flat plate.
Thereby, since the interstitial material can be filled into the gap portion between the protrusions, the overload can be dispersed in the interstitial material. Of course, the interlining material is made of a material and filling that does not restrain deformation of the protrusions.

In another invention, a plurality of seismic isolation base blocks described above are used, the ridges are installed facing the ground, and a building is constructed on the flat plate. This is a base-isolated base structure characterized by
Further, using a plurality of seismic isolation base blocks of any of the above described, the ridges are installed so as to stand upward from the ground, a smooth surface is formed on the top of the ridges, A base-isolated foundation structure in which a foundation of a building is constructed on the smooth surface.

  Further, a space between the protrusions is filled with a filling material.

  By adopting the seismic isolation base block according to the present invention and the seismic isolation base structure based thereon, it is possible to reliably attenuate vibrations from the ground while having a simple structure. That is, it is possible to provide a base isolation block and a base isolation base structure using the base isolation block at low cost.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view in a state in which the bottom surface of the seismic isolation base block according to the present embodiment is faced up. FIG. 2 is an enlarged side view of the protrusion.
Seismic Isolation base block 10 in the present embodiment, the flat plate 12, arranged such that the plurality of rows at a predetermined interval on the lower surface of the plate 12, projections 16 comprising a plurality of linear protrusion piece 14 have.

The flat plate 12 is formed into a substantially rectangular plate-like body with synthetic resin. The synthetic resin used for the flat plate 12 can be formed of a recycled material such as waste plastic instead of the virgin material.
The flat plate 12 is provided with through holes 18 penetrating in the thickness direction (vertical direction) of the plate with a required interval. Moreover, the connection part 20 which connects the adjacent seismic isolation base blocks 10 and 10 mutually by uneven | corrugated fitting is formed in the side wall part (outer peripheral part) of the flat plate 12. As shown in FIG. The connecting portion 20 is provided at a substantially central portion on each outer periphery of the flat plate 12.

  One protrusion body 16 is planted on the flat plate 12 so that a plurality of protrusion body pieces 14, 14,... The ridge body piece 14 constituting the ridge body 16 in the present embodiment is made of a material having three kinds of elastic coefficients (E1, E2, E3). Specifically, the protrusion piece 14 is formed of a steel wire, natural rubber, synthetic resin (including synthetic rubber), or the like.

  The ridge body pieces 14 constituting the ridge body 16 are arranged concentrically so that the elastic coefficient gradually increases from the central portion of the columnar ridge body 16 toward the outer peripheral edge. Moreover, the length (L1, L2, L3) dimension of the protrusion piece 14 is provided such that the smaller the elastic modulus, the longer. Therefore, in the present embodiment, the length of the protrusion 14 constituting the protrusion 16 is the longest at the central portion of the protrusion 16 as shown in FIG. It arrange | positions so that it may become short in steps toward the outer periphery from the center part of the strip 16. That is, the tip of the ridge 16 is formed in a mountain shape.

Since the projecting body 16 is composed of a plurality of types of projecting body pieces 14 having different elastic coefficients and lengths, when the seismic isolation base block 10 is disposed with the projecting body 16 as a lower surface, the projecting body 16 There is a difference between the deformation amount (shrinkage amount) in the central portion and the deformation amount in the outer peripheral portion. Thereby, all the apparent length of the strip body piece 14 of the strip body 16 after installation of the seismic isolation base block 10 can be made equal.
Further, in the case where vibration is generated by an earthquake or the like, the vibration is attenuated mainly by deformation of the protrusion 14 having a small elastic coefficient in the case of weak vibration, and the protrusion having a large elastic coefficient in the case of strong vibration. The vibration can be attenuated by the deformation of the strip 14 and can be reliably and effectively attenuated over a wide range of vibrations.

  The through-holes 18 are arranged in the gap portions of the protrusions 16 arranged in the flat plate 12 with a necessary interval. After a plurality of seismic isolation base blocks 10 are arranged on the ground, a filling material is filled from the through hole 18 to the lower surface side of the flat plate 12 as necessary. The filling material is filled to such an extent that deformation of the protrusions 16 in the horizontal direction and the vertical direction is not restricted. By filling the filling material loosely on the lower surface side of the flat plate 12, a part of the overload acts on the filling material. As the filling material, a lightweight foam material such as polystyrene foam is preferably used.

The connecting portion 20 is detachable in the vertical direction, but has a concave portion 20a and a convex portion 20b so as to be fixed to each other in the horizontal direction. The concave mold portion 20a and the convex mold portion 20b are disposed on the flat plate 12 at plane positions facing each other. The connection part 20 is connected by fitting the convex part 20b of the seismic isolation base block 10 adjacent to the concave part 20a of a certain base isolation base block 10 from above. It becomes the state where it was prevented from coming off in the connected state.
Thus, since the connection part 20 is provided, the seismic isolation foundation of a desired area is easily arrange | positioned by arrange | positioning quantity suitably, connecting the base isolation base blocks 10 formed in the predetermined magnitude | size mutually. Can be built.

(Second Embodiment)
In 1st Embodiment, although the form which formed the protrusion body 16 using the protrusion body piece 14 which consists of a multiple types of material from which an elastic modulus and length differ was demonstrated, in this embodiment, there is a certain one. Although the two ridges 16 themselves are formed by the ridge body pieces 14 having the same elastic modulus and length, the elastic moduli and lengths of the ridge body pieces 14 according to the arrangement area of the ridge bodies 16. The form which changes is demonstrated.

FIG. 3 is a perspective view showing a schematic state of the protrusions arranged on the seismic isolation base block in the second embodiment.
As shown in FIG. 3, the protrusion 16 in the present embodiment divides the flat plate 12 into three areas including an outer peripheral area (A1), an intermediate area (A2), and a central area (A3) from the outer peripheral edge portion to the central portion. Then, from the central area (A3) toward the outer peripheral area (A1), the elastic modulus of the ridge body piece 14 forming the ridge body 16 is gradually reduced (e1 <e2 <e3), and the length is reduced. The length is gradually increased (l1>l2> l3). In the same area, the elastic body pieces 14 have the same elastic modulus and length. Such a ridge body 16 is advantageous because the ridge body 16 can be easily formed, and the manufacturing cost of the seismic isolation base block 10 can be reduced.

  In the seismic isolation base block 10 having such a ridge body 16, the ridge body 16 in the outer peripheral area (A1) having a small elastic coefficient of the ridge body piece 14 mainly attenuates vibrations against weak vibration. For strong vibrations, the protrusions 16 in the central area (A3) having a large elastic coefficient of the protrusions 14 mainly dampen the vibrations, and effectively vibrate against a wide variety of vibrations. Can be attenuated.

Next, the construction method of the base isolation using the base isolation base block 10 will be described. FIG. 4 is a cross-sectional view showing the structure of the seismic isolation foundation.
First, the ground G is leveled over a slightly wider range than the range in which the seismic isolation foundation 50 is constructed (step 1). After floor leveling, basic crushed stone and leveled concrete may be applied as necessary. In short, it is only necessary that the surface on which the seismic isolation base block 10 is arranged can be made smooth. After floor leveling, the protrusions 16 are arranged in a lower side, and the connecting portions 20a, 20b of the adjacent seismic isolation base blocks 10 are connected to each other by fitting them into an uneven shape (step 2). After the seismic isolation base block 10 is disposed and connected so that the adjacent flat plate 12 becomes a flat surface, a filling material 30 such as styrene foam is filled around the protruding body 16 from the through hole 18 (step 3). ). When the filling of the filling material 30 is completed, the through hole 18 is closed by the closing means 40 (step 4). A known closing means 40 such as a cap or a caulking material is used to close the through hole 18.

  As described above, the seismic isolation foundation 50 is constructed on the original ground G. On the seismic isolation foundation 50, a building foundation or a building itself (both not shown) may be constructed based on the conventional technology. The building thus constructed has a seismic isolation structure, and vibrations generated by the earthquake or the like are attenuated before propagating to the building or the foundation of the building. That is, the building constructed on the seismic isolation foundation 50 does not need to have an earthquake-resistant structure, and the building body can be constructed at low cost.

  In the present embodiment, the embodiment in which the present invention is applied to the foundation portion of the building has been described, but the present invention is not limited to the foundation of the building. For example, it is of course possible to apply the present invention to a floor slab of a building. In this case, if the present invention is applied to the basic part of the building to make the building itself a seismic isolation structure, and the present invention is also applied to a floor slab on which furniture or the like is placed, vibrations are reduced. It is advantageous because it is heavily attenuated. Such a structure can be particularly suitably used for buildings such as hospitals, museums, and art galleries.

Moreover, in the above embodiment, although the form which the protrusion 16 was arrange | positioned only in the lower surface side of the flat plate 12 was demonstrated, for example, only the upper surface of the flat plate 12, or a protrusion on both upper and lower sides A body 16 can also be provided. When such a seismic isolation base block 10 is used, a building is constructed after a flat plate (not shown) is placed on the upper side surface of the ridge body 16.
Furthermore, when filling the filling material 30, it goes without saying that a through-hole for filling the filling material is provided on the flat plate disposed on the upper side surface of the protrusion 16.
Furthermore, the material of the flat plate 12 is not limited to a synthetic resin as long as it is a material having a resistance to an overload, and may be formed of concrete, wood, rubber, metal, or the like.

In addition, the seismic isolation base 50 according to the present invention does not necessarily require the filling operation of the filling material 30 around the protruding body 16. Depending on the material of the base ground G and the strip body piece 14 and the shape of the strip body 16, the filling work of the filling material 30 can be omitted.
Furthermore, it can also be set as the seismic isolation base block 10 of the simple structure comprised by the strip body piece 14 which formed the protrusion body 16 provided in the base isolation base block 10 with the same material altogether. In this case, if the diameter dimension of the ridge body piece 14 is changed in a plurality of stages within one ridge body 16 or within the seismic isolation base block 10, vibrations can be effectively applied to various vibration patterns. A sufficient effect of attenuation can be obtained.
Further, as a simpler seismic isolation base block 10, it is also possible to form the ridge body piece 14 from a single material and make the diameter dimension and length of the ridge body piece 14 uniform. It is.

  Furthermore, in the above-described embodiment, the mode of attenuating vibration due to an earthquake or the like by elastic deformation of the ridge body piece 14 constituting the ridge body 16 has been described. For example, a very strong earthquake occurs. In this case, it is also conceivable that the ridge body piece 14 is not deformed only in the elastic range, but the vibration is attenuated by elastic-plastic deformation or plastic deformation that attenuates the vibration by deforming beyond the elastic range.

It is a perspective view in the state where the bottom of the seismic isolation foundation block in this embodiment was turned up. It is an enlarged side view of a protrusion part. It is a perspective view which shows the schematic state of the protrusion body arrange | positioned at the seismic isolation base block in 2nd Embodiment. It is sectional drawing which shows the structure of a base isolated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Base isolation block 12 Flat plate 14 Strip body piece 16 Protrusion part 18 Through-hole 20 Connection part 30 Filling material 40 Closure means 50 Base isolation

Claims (6)

A flat plate,
A seismic isolation basic block in which a plurality of linear protrusion for attenuating the dynamic vibration on at least one surface of the upper and lower surfaces of the flat plate, which are disposed upright,
The protruding body is formed by a plurality of types of protruding body pieces having different elastic coefficients,
The ridge body piece is formed to have a different length for each elastic modulus, and the protrusion height of the ridge body piece from the flat plate when the ridge body is installed in a state facing the ground surface. seismic isolation foundation block, characterized in that Rukoto are formed in length to match each of. The flat plate is formed in a unit plate shape having a predetermined size and shape, and a connecting portion for connecting adjacent flat plates is formed on an outer peripheral edge portion of the flat plate. The seismic isolation basic block according to claim 1. The seismic isolation base block according to claim 1 or 2 , wherein a through-hole penetrating in the plate thickness direction of the flat plate is formed in the flat plate . A plurality of seismic isolation base blocks according to any one of claims 1 to 3, wherein the projecting body is installed facing the ground, and a building is constructed on the flat plate. Characteristic base isolation structure. A plurality of seismic isolation base blocks according to any one of claims 1 to 4, wherein the ridges are installed so as to stand upward from the ground, and a smooth surface is provided above the ridges. seismic isolation substructure but formed, characterized in that the foundation of the building on the flat smooth surface is constructed. The seismic isolation foundation structure according to claim 4 or 5, wherein a space is filled around the protrusions .

Images