JP5348945B2 - Seismic isolation structure of building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation structure of a building for reducing propagation of vibrations to the building when the ground is shaken by an earthquake or the like, while assuring the engagement between a foundation and a base. <P>SOLUTION: The base isolation structure for seismically isolating a foundation structure of the building comprises a base member having a height in the vertical direction and supporting the building, a rail member having a groove part enclosing a lower end of the base member, and a plurality of spherical bodies housed in the grooved member to support a lower face of the base member. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a base isolation structure that performs base isolation in a foundation structure of a building. In particular, the present invention relates to a seismic isolation structure for a building that makes it difficult to convey the shaking in an earthquake or the like to the building by supporting the building with a sphere.

  Earthquakes occur so frequently that Japan is said to be an earthquake-prone country. In particular, once a large-scale earthquake occurs, many accidents occur, such as the collapse of many houses.

  In addition, if an earthquake with a seismic intensity of a certain level or more occurs even if it does not reach a large scale, there are many dangerous situations for residents, such as indoor ornaments falling and furniture falling down.

  Further, in the case of buildings, vibrations caused by earthquakes and the like have an adverse effect on the coupling state of columns, beams, or wall surfaces, and the coupling may be loosened or deformed.

  Therefore, various ideas have been proposed so far that even if the ground is shaken by an earthquake or the like, the shake is not transmitted to the building.

  Patent Document 1 (Japanese Patent Laid-Open No. 2001-20999) has been proposed as one that particularly uses a sphere. This document proposes a seismic isolation element in which a plurality of spheres are arranged side by side between upper and lower metal positions.

  The seismic isolation element proposed in Patent Document 1 has a complicated structure and cannot sufficiently absorb the horizontal and vertical stresses during an earthquake. Patent Document 2 (Japanese Patent Application Laid-Open No. 2007-169990) Publication).

  The seismic isolation device proposed in Patent Document 2 is a seismic isolation device installed in the lower part of a concrete foundation and a building base via a base cradle made of H-shaped steel or the like. It consists of a box made of a combination of opposing upper and lower cavities, and each denter is provided with a partition that is vertically opposed to each other to divide the inside of the box into a plurality of compartments. An elastic material is fitted on the inner surface side of the concave bottom portion of each section, and an iron sphere is sandwiched between the upper and lower elastic materials so as to be rollable.

  Further, Patent Document 3 (Japanese Patent Laid-Open No. 2007-113377) is capable of buffering lateral and vertical shaking, and has a wooden house or foundation that is extremely weak against earthquakes, and has earthquake resistance in a concrete house. In order to improve, it has been proposed to insert a sliding slipper which is provided with a steel ball and is movable with respect to the foundation at the lower position of the vertical column between the gap formed between the concrete foundation and the foundation of the building.

Patent Document 4 (Japanese Patent Application Laid-Open No. 2005-264580) discloses a seismic isolation device that can absorb rolls in all directions and can absorb vibrations in the vertical direction, and an isolation device that is provided with the seismic isolation device. As a seismic house structure, it is fixed to the foundation and has a foundation side sphere accommodating part formed in a concave shape on the upper surface, and a foundation supporting the house, and is opposed to the foundation side sphere accommodating part. A foundation-side plate having a foundation-side sphere housing portion formed in a concave shape, and the base-side sphere housing portion and the foundation-side sphere housing portion, and the foundation-side plate is placed on the foundation-side plate. A sphere holding part, a base side plate, and a base side plate, each of which includes a steel sphere to be supported and an elastic member, and holds the steel sphere at substantially the center of the base side sphere storage part and the base side sphere storage part. Accordingly flange portion sandwiched, and seismic isolation device comprising at least composed elastic holding member has been proposed by the cylindrical main body which is 囲設 the outer peripheral surface of the base side plate and said base side plate.
JP 2001-020999 A JP 2007-169990 A JP 2007-113377 A JP 2005-264580 A

  Each of the seismic isolation structures proposed in Patent Documents 1 to 4 uses a sphere or the like, but the structure is complicated, and the manufacture of dedicated hardware is indispensable, and construction is still difficult. It is.

  Furthermore, in the conventional seismic isolation structure using a sphere, the sphere is a contact point between the foundation and the foundation, but only one or several spheres are arranged at a predetermined interval. Therefore, a great load acts on the contact point between the base and the base of the sphere. That is, since the seismic isolation structure is adopted, the engagement between the foundation and the foundation may be weak.

  Therefore, the present invention provides a seismic isolation structure for a building that can reduce the propagation of vibration to the building when the ground is shaking due to an earthquake or the like while ensuring the certainty of the engagement between the foundation and the foundation. The first task is to provide

  Furthermore, conventional seismic isolation structures are often complicated and difficult to construct.

  In addition, anchors and other metal fittings are used to fix the foundation to the foundations made of concrete, etc., in the past, but if the protruding part of the anchor metal fitting does not match the location of the through hole in the foundation The engagement between the two becomes difficult.

  Then, this invention makes it the 2nd subject to provide the seismic isolation structure of the building which can perform such engagement of a foundation and a foundation easily.

  In order to solve at least one of the above problems, the present invention provides a seismic isolation structure for a building that supports the building with a sphere.

  That is, in this invention, it is a base isolation structure which performs base isolation in the foundation structure of a building, Comprising: The base member which has a height of a perpendicular direction and supports a building, and the lower end of the said base member is included. Provided is a seismic isolation structure for a building, comprising a groove-shaped rail member and a plurality of spherical members housed in the groove member and supporting the lower surface of the base member.

  The said base member supports the said building as a base of a building, can be used as a base in the conventional frame assembly method, or can be used as a base itself.

  The lower end of the base member is formed to have a horizontal plane, and the lower end is accommodated in a groove-like rail member formed on the ground.

  And a several spherical body exists between the bottom face of this rail member, and the horizontal surface of a base member lower end. Since the sphere functions as a support for the building, it needs to be formed as a metal sphere or the like having a certain strength. Such a sphere depends on the width of the rail member and the size of the horizontal surface at the lower end of the base member, but it is usually desirable to use a metal sphere having a diameter of about 1 to 5 cm.

  In addition, a horizontal portion that extends in the width direction of the rail member is formed at the lower end of the base member, and an inner side of the rail member is formed on the opening side of the groove-like rail member so as to cover the horizontal portion. It is desirable to form a cover part that is bent at the same time. That is, a base member is comprised by the bolt part couple | bonded with the foundation of a building, and the horizontal part extended in the horizontal direction provided in the lower end of this bolt part. In addition, the rail member is formed such that its cross-sectional shape in the lateral direction lacks the central portion of the rectangular upper surface. In this way, by forming a cover part in which the upper end side of the side surface of the rail member is bent to the center side in the width direction, and covering the horizontal part provided at the lower end of the base member with this cover part, the horizontal part Does not escape from the rail member. Therefore, even if an excessively large pitch occurs, it is possible to avoid a situation in which the foundation of the building is lifted and falls.

  Furthermore, according to the combination of the base member and the rail member described above, the base member fixed to the foundation of the building does not require strict positioning with respect to the rail member fixed to the ground. Positioning and engagement of the base (that is, the foundation and the base) can be easily performed.

  In the seismic isolation structure according to the present invention, it is preferable that an anchor cable fixed to the rail member or a structure on which the rail member is laid is connected to the base member. This anchor cable is for fixing the building to the ground, and eliminates the inconvenience that the building moves in the rail when the ground is not shaken.

  And this anchor cable is always the first length that fixes the building to the ground, and when the building is moved by vibration, it is changed to the second length that is longer than the first length. It is desirable to be formed as follows. As such an anchor cable, for example, a structure that extends with a certain tension, or a cable that folds the anchor cable to a certain length and receives a certain tension, the fastener that fixes the folded portion breaks and extends. Can be formed.

  As the anchor cable, it is desirable to use a wire cable because it is required to have a certain resistance to tension and further has excellent weather resistance.

  In addition, it is desirable that the bottom surface of the rail member has a depressed central portion in the width direction, and the lower surface of the base member protrudes in a shape that faces the recess of the bottom surface of the rail member. Since the bottom surface of the rail member is depressed, the center of the rail member in the width direction is lowered as a whole, and the lower surface of the base member provided thereon is also added. Due to the load of the building, the rail member approaches the center in the width direction. Therefore, in order to expect such an effect, it is desirable that the recess on the bottom surface of the rail member is curved and recessed toward the center in the width direction of the rail member.

  Moreover, it is desirable that the base member further includes a buffer member that elastically supports the base of the building portion on a horizontal portion that extends in the width direction of the rail member.

  As such an elastic member, a spring or rubber can be considered. By fixing the base of the building to the base member via the elastic member made of such a spring or rubber, even if a vertical shaking occurs, the vibration is absorbed and the shaking in the building is reduced. be able to.

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

  FIG. 1 is a schematic diagram showing an outline of a building 1 in which the seismic isolation structure according to the present invention is adopted as a foundation, and FIGS.

  First, the building 1 according to this embodiment will be described with reference to FIGS. 1 and 2. A base 2 of the building 1 is connected to a seismic isolation structure shown in the following drawings.

  In the present embodiment, a base member 20 instead of an anchor bolt is fixed to the base 2 of the building 1. The base member 20 is formed of a bolt portion 21 that passes through the base 2 and is fixed by tightening an upper end with a nut 25, and a horizontal portion 22 that is provided at the lower end of the bolt portion 21 and extends in the horizontal direction. ing. The horizontal portion 22 is accommodated in a rail member 30 laid below the base 2 of the building 1.

  The rail member 30 is formed in a “U” -shaped cross-section with the tip portion bent inward, and is a bottom surface of the rail member 30, and a plurality of rail members 30 between the horizontal member of the base member 20. A sphere 40 is laid.

  In such a configuration, even if the ground 3 is shaken due to an earthquake or the like, the shake is buffered by the sphere 40 existing between the rail member 30 and the base member 20, and the shake is transmitted directly to the building 1. Disappear.

  In particular, in this embodiment, the rail member 30 is formed as a separate member installed on the ground 3. For example, a groove formed by excavating a foundation formed of concrete or the like and having the base member 20. Can also be formed. However, in view of the removal of dust accumulated in the groove and the possibility of replacement, it is desirable to lay it as a separate member as shown in this embodiment.

  In addition, an anchor wire 50 fixed to the ground 3 is installed on the base member 20 fixed to the building 1, thereby preventing shaking during normal times. In this embodiment, a wire is used as the anchor wire 50. In addition, in the drawing in this embodiment, although the curved state is shown in the meaning which emphasizes the softness | flexibility of a wire, in the actual construction, the said anchor wire 50 is provided in the tension | tensile state, and in the said building 1 Can prevent shaking. When the ground 3 is shaken by vibration, the anchor wire 50 is naturally disconnected from the building 1 (specifically, the base member 20), and the building 1 and the ground 3 Can only be engaged through.

  Such an operation will be described with reference to FIG. 3. If the ground 3 is shaken due to an earthquake or the like, the anchor wire 50 is moved from the base member 20 by relative movement between the ground 3 and the building 1. Disconnected. And even if the ground 3 shakes, the building 1 itself is held by the inertial force due to its own mass, so there is no relative displacement between the ground 3 and the building 1. Occurs. As shown in FIG. 3, this deviation is absorbed and buffered by the rolling of the sphere 40 that rolls in the rail member 30, and relative movement between the two becomes possible.

  Thereby, even when the ground 3 is shaken, the shake is released without being transmitted to the building 1, that is, a seismic isolation structure is realized.

  On the other hand, the shaking caused by the occurrence of an earthquake is not necessarily limited to a lateral shaking. That is, since pitching also occurs, it is necessary to absorb this pitching in order to perform reliable seismic isolation.

Therefore, in the present embodiment, the elastic member 23 is provided at the portion where the building 1 and the rail member 30 are engaged, specifically, on the horizontal portion 22 of the base member 20 where the base 2 of the building 1 is fixed. As a result, a vertical swing in the ground 3 is prevented from acting directly on the building 1. In particular, in this embodiment, under the base 2 in the presence of sideways "H" shaped metal member, and the presence of elastic members 23 between the horizontal portion of the lower end and the base member 20.

  As a result of such a configuration, even if pitching occurs, the pitching is absorbed by the elastic member 23 as shown in FIGS. In particular, FIG. 4 shows a state in which the ground 3 and the base 2 of the building 1 are close to each other, while FIG. 5 shows a state in which the ground 3 and the base 2 of the building 1 are separated. In particular, in this embodiment, the horizontal “H” -shaped metal member 26 provided below the base 2 has the horizontal planes of the upper and lower ends developed so as to sandwich the opening of the upper end side 32 (cover portion) of the rail member 30. Therefore, the pitching is restricted by the length of the metal member 26. By regulating the vertical swing width in this way, the building 1 can be prevented from collapsing even when the vertical swing is larger than expected, for example. This is because the seismic isolation structure is used for buffering up to a certain length of pitching, and even when the pitching is more intense, the vertical pitching shock is buffered by the elastic force of the elastic member 23, As a result, the pitching is attenuated and an increase in the swinging width is prevented.

  FIG. 2 shows the seismic isolation structure in an enlarged manner. In particular, the bottom surface of the rail member 30 in this seismic isolation structure is curved and recessed toward the center, and the top surface of the sphere 40 is also curved so as to follow this. The bottom surface of the horizontal portion of the base member 20 bulges downward along the curved shape. As a result, the base member 20 can always stand upright at the center of the rail member 30. .

  Further, the rail member 30 is fixed to the ground 3 with bolts or the like by a fixing portion that protrudes to the left in FIG. In particular, when the ground 3 is lowered by fixing in this way, for example, as shown in FIG. 6, by inserting a filling 51 between the rail member 30 and the ground 3, the building 1 Can be corrected. Therefore, it is desirable that the bolt 52 for fixing the rail member 30 is formed to be somewhat long, preferably about 20 to 50 cm.

  FIG. 7 is a plan view showing a state in which the rail member 30 is laid on the ground 3. As shown in this figure, it is desirable that the rail member 30 is formed under the base 2 in the building 1 so as to surround the building 1. In the building 1 formed in this way, when rolling occurs, it can move in the horizontal direction by the width of the gap on the upper end surface of the rail member 30.

  Further, FIG. 8 is a perspective sectional view showing the above-described seismic isolation structure viewed from the lateral direction. As shown in this figure, each base member 20 passes through the base 2 and is fixed, and a horizontal portion is provided at the lower end thereof. In particular, in the aspect shown in FIG. 8A, the horizontal portions are integrated and are accommodated in a rail member 30 provided on the ground 3. The base member 20 thus formed is preferably formed so that the bolt portion 21 and the horizontal portion 22 are connected at the time of installation. This is because, as with the conventional anchor wire 50, the base member 20 provided on the base 2 does not need to be positioned in relation to the base 2. In the embodiment shown in FIG. 8B, each horizontal portion 22 is made independent for each bolt portion 21. If formed in this way, the positioning of the base member 20 with respect to the base 2 becomes unnecessary, and the building is constructed. The construction of the object 1 can be easily performed.

  It should be noted that the seismic isolation structure according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

Schematic showing the installed state of the building Schematic diagram showing seismic isolation structure Expanded cross-sectional view of the main part showing the effect of the seismic isolation structure Expanded cross-sectional view of the main part showing the effect of the seismic isolation structure Expanded sectional view of the main part showing other functions of the seismic isolation structure Schematic showing the tilt correction structure in buildings Schematic showing the laying state of rail members Side perspective diagram showing seismic isolation structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building 2 Base 3 Ground 20 Base member 21 Bolt part 22 Horizontal part 23 Elastic member 26 Metal member 30 Rail member 40 Sphere 50 Anchor wire 51 Filling 52 Bolt

Claims (5)

A base isolation structure that performs base isolation in the basic structure of a building,
A base member having a vertical height to support the building;
A rail member having a groove part including the lower end of the base member;
Is accommodated in the groove member, Ri Do and a plurality of spherical members for supporting the lower surface of the base member,
A horizontal portion extending in the width direction of the rail member is formed at the lower end of the base member, and the opening side of the groove-shaped rail member is bent to the inside of the rail member so as to cover the horizontal portion. A covered cover is formed,
Under the base of the building, a horizontal H-shaped metal member is present so that the horizontal planes of the upper and lower ends develop so as to sandwich the opening of the cover part in the rail member,
Seismic isolation structure of the between the horizontal portion of the lower end and the base member transverse H-shaped metal member, characterized by Rukoto the foundation of the building unit has an elastic member for elastically supporting buildings.
The rail member according to claim 1 , wherein the rail member is fixed to the ground with a bolt by a fixing portion protruding laterally, and the bolt for fixing the rail member is formed to be 20 to 50 cm . Seismic isolation structure for buildings.
The seismic isolation structure for a building according to claim 1 or 2, wherein an anchor cable fixed to the rail member or a structure on which the rail member is laid is connected to the base member.
4. The building according to claim 1, wherein the bottom surface of the rail member has a recessed central portion in the width direction, and the bottom surface of the base member protrudes in a shape facing the recess of the bottom surface of the rail member. Seismic isolation structure.

  A building in which a base isolation structure is formed between a foundation and a foundation in the building, and the base isolation structure is the base isolation structure according to any one of claims 1 to 4.