JP5590447B2 - Building ground structure capable of suppressing earthquake motion and its construction method - Google Patents

Description

The present invention relates to a building ground structure capable of quickly suppressing vibration caused by an earthquake, particularly a horizontal ground motion called an S wave in a building, and a construction method thereof.

  The basic principle of seismic isolation devices is to suppress the transmission of ground vibrations by allowing plastic deformation of buildings against seismic vibrations propagating from the basement. In concrete structures of relatively large scale, A laminated rubber isolator formed by alternately laminating a rubber-like elastic body and a metal plate between a pair of plates is used as a seismic isolation device (for example, Japanese Patent Publication No. 06-60539).

On the other hand, for example, also in wooden houses, seismic isolation devices having earthquake resistance and seismic isolation have been proposed.
That is, in Japanese Patent Application Laid-Open No. 10-30276 (Patent Document 1), the bottom of the foundation concrete formed with the base and the rise at the same time is laid with a mat made of foamed resin, etc. Connect the beams via.
The connection fitting extends a support plate vertically from a back plate fixed in contact with the beam, forms a support groove on the support plate, and forms a slit groove on one beam from its end face, A pin is mounted horizontally through the slit groove, and a support plate is fitted into the slit groove, and the pin is locked and connected to the support groove, and the wall plate and the floor plate are both surfaces of a core material such as polystyrene foam. A wooden house structure using a board material with plywood attached to it has been proposed.

  Moreover, in patent 3761803 gazette (patent document 2), the ground side foundation formed in the ground where a building is constructed | assembled, and the building side foundation comprised in the lower part of a building and set | placed on the said ground side foundation In the meantime, a building earthquake-reduction foundation structure having at least one friction reducing mechanism and at least one yawing prevention mechanism has been proposed.

In the present invention, the friction reducing mechanism is composed of a plate material having a predetermined area provided on the ground side foundation, and a sliding member that can slide on the plate material together with the building side foundation. .
The sliding member is a metal such as a steel material, ceramic, a resin body, or at least a part of a lower surface thereof, in which a resin material for reducing friction is fixed or applied.
Further, the plate material is a metal plate such as a steel plate, a ceramic plate, a resin plate, a stone plate, or a concrete plate, or a resin material for friction reduction fixed or applied to at least a part of the upper surface thereof. ing.

  Moreover, in Unexamined-Japanese-Patent No. 2002-70039 (patent document 3), it is comprised between the ground side foundation where a house is constructed | assembled, and the housing side foundation comprised in the lower part of a house, and is set | placed on the said ground side foundation. Between the housing side foundation and the ground side foundation, when the housing side foundation is displaced with respect to the ground side foundation by vibration associated with an earthquake, It is disclosed that an automatic return mechanism for automatically returning to the original position is provided at a plurality of locations.

  Japanese Patent Laid-Open No. 2007-285092 (Patent Document 4) discloses that a mat having a specific thickness, an attenuation coefficient, and a dominant frequency in use is laid on all or a part of the surface ground corresponding to a building. Has been.

Furthermore, in Japanese Patent Application Laid-Open No. 2003-147783 (Patent Document 5), at least two or more vinyl chlorides having a large surface activity are provided between the reinforced concrete disposed on the ground side and the solid foundation supporting the building body. A seismic isolation foundation for a building in which a sheet member made of a sheet is interposed is disclosed.

JP-A-10-30276 (Claims) Japanese Patent No. 3761803 (Claims) JP 2002-70039 (Claims) JP 2007-285092 A (Claims) JP 2003-147783 A (Claims)

The seismic isolator has a stable structure and many achievements in its performance, but the device is complicated in structure, large in scale and heavy, so special techniques are required for handling. is there.
In addition, since various mechanical devices and a lot of labor are required for construction, there remains a problem that it is difficult to apply to general wooden houses.

  On the other hand, in the inventions described in any of Patent Documents 2 to 5 proposed for wooden houses, a friction reduction mechanism and / or between a foundation provided on the ground side and a foundation provided in the lower part of the building Alternatively, a sliding member is interposed, and each effect is described in each document.

  However, in Patent Document 2, the building has a yawing prevention mechanism for turning around a certain point on the foundation on the ground side, and it is necessary to form a through hole in the foundation on the building side in the implementation. It has labor and cost for construction.

Furthermore, the damping member used in each document is in the form of a sheet or a mat, and there are many problems to be solved such as difficult handling during construction.
In particular, when using a sheet, the concrete surface on which the sheet is laid is smooth in the horizontal direction against ground vibration due to the fact that some degree of bending, undulation, and unevenness cannot be avoided due to the limit of construction accuracy. The intended motion of sliding cannot be verified.

In view of the present situation, the present invention has a simple structure, is easily available, has excellent workability, is easy to handle during construction, can be applied to a wooden house, and has a certain level of performance for suppressing seismic motion. It is intended to provide a building ground structure that can suppress seismic motion that can ensure the quality that can be guaranteed, and a construction method thereof.

In order to achieve the above object, the invention according to claim 1 of the present invention provides:
In the root cutting part formed in the ground, the whole surface forms an artificial ground,
On the surface of the artificial ground, a plurality of sliding bodies made of a plate-like resin foam previously processed to have a required shape, thickness, and size are provided between the inner side surface of the root cutting portion. With a gap, laying the entire surface without any gaps,
Wherein the upper surface of the sliding body laid on the root cutting portion, an upper sliding body made of the same material and shape, at least one or more stages, such that adjacent boundary surfaces of the upper sliding body is not close to each other in the vertical direction There is a required gap between the inner surface of the root cutting part, and the entire surface is laminated and spread.
The upper surface of the upper sliding body is brought into contact with the bottom surface of the solid foundation in which the entire bottom surface of the foundation slab is formed flat ,
The sliding bodies stacked on the top and bottom are engaged with a shock absorbing member arranged vertically between the artificial ground and the foundation concrete with a predetermined interval, and an earthquake motion is characterized. It is a construction ground structure that can be suppressed.

The invention according to claim 2 of the present invention is
In the building ground structure which can suppress the earthquake motion according to claim 1,
The artificial ground is
It is characterized in that it is configured by placing discarded concrete flatly with a required thickness on the surface of a cracked stone laid flat with a predetermined thickness in the root cutting part.

The invention according to claim 3 of the present invention is
In the building ground structure which can suppress the earthquake motion according to claim 1,
The sliding bodies stacked above and below are
It is characterized in that the compressive strength obtained by a compression test by loading in a perpendicular direction and the friction coefficient obtained by a single-surface shear test in a parallel direction are maintained.

The invention according to claim 4 of the present invention is
In the building ground structure which can suppress the earthquake motion according to claim 1 ,
In the gap formed between the edge of the sliding body laid on the artificial ground and the inner surface of the root cutting part, a cushioning resin foam is vertically stacked. It is a feature.

The invention according to claim 5 of the present invention is
In the building ground structure which can suppress the earthquake motion according to claim 1 or 4 ,
The gap is
The upper opening is covered with a cover member.

The invention according to claim 6 of the present invention is
In the building ground structure which can suppress the earthquake motion according to any one of claims 1 to 5 ,
The sliding body is
It consists of a resin foam containing fine bubbles of polyethylene or styrene.

The invention according to claim 7 of the present invention is
In the building ground structure which can suppress the earthquake motion according to claim 1,
The solid foundation is
The inner surface of a connecting beam formed integrally along the periphery of a flat foundation slab and the inner bottom surface of the foundation slab are integrally connected by a beam member having a triangular cross section. It is what.

Further, the invention according to claim 8 of the present invention is
After excavating a root cutting part with the required size and depth on the ground to build the building,
In the root cutting part, the artificial ground having a flat surface with a required thickness is formed over the entire surface,
On the surface of the artificial ground, and presence of the required interval between at least the inner side surface of the root cutting portion, a plurality of sliding body comprising a plate-like resin foam having a size of desired thickness, without a gap While laying,
Adjacent boundaries of each upper sliding body with a required gap between the upper sliding body made of the same material and shape on the upper surface of the sliding body and at least one step between the inner surface of the root cutting part Laminate and spread over the entire surface so that the surfaces are not close to each other in the vertical direction,
The sliding bodies stacked above and below are engaged with a cushioning member disposed vertically between the artificial ground and the foundation concrete with a predetermined interval,
After that, the top surface of the upper sliding body is formed by bringing the bottom surface portion of the solid foundation in which the entire bottom surface portion of the foundation slab is formed into contact with each other. It is a construction method.

  The ground structure of the present invention that can suppress the seismic motion is in the vertical direction on the artificial ground with a flat surface made of crushed stone or abandoned concrete, in the root cutting part excavated in the ground for building the building. Since a plurality of sliding bodies made of a plate-shaped resin foam processed into a required shape, thickness and size in advance so as to be at least two steps are laid in a laminated state without gaps, The sliding body on the joint surface is plastically displaced by the ground vibration, and the ground vibration can be suppressed by the horizontal movement of the sliding body.

  In particular, since the specific gravity of the sliding body is extremely small, the same effect as that obtained by reducing the weight of a part of the ground by laying over the entire surface can be obtained. It is obtained.

  Furthermore, since a resin foam is used as the sliding body, it is very easy to obtain and can be processed in advance into a factory in the required shape, thickness and size according to the application site. It has excellent portability, and it is only necessary to lay it all over the site, so that the construction work is greatly simplified and the work efficiency is greatly improved.

  Furthermore, the sliding body is light in weight, and can be easily corrected in the field even if there is an error in size, dimensions, etc., and does not require special equipment or skill at the site. There is no generation of noise and vibration, and it is excellent in workability.

  Furthermore, since the sliding body made of a resin foam is excellent in impact resistance, by properly setting the thickness, the sliding body exerts a certain degree of suppression effect on vertical ground vibration called P-wave. It is also possible to have a heat insulation effect at the same time.

Furthermore, the construction method of a building ground structure capable of suppressing the ground motion according to the present invention can easily build a ground structure capable of quickly absorbing the ground motion on the ground for building the building. The obtained ground structure exhibits the above-mentioned excellent effects.

It is a schematic explanatory drawing of the building ground structure which can suppress the earthquake motion concerning this invention. FIG. 2 is an enlarged reference diagram of a main part in FIG. 1.

  Hereinafter, an embodiment of a building ground structure capable of suppressing seismic motion according to the present invention will be specifically described based on the drawings.

As shown in FIG. 1, a building ground structure 1 capable of suppressing seismic motion according to the present invention has a surface formed with a predetermined thickness in a root cutting part 3 formed by excavation on a predetermined ground 2 in the site. Of the artificial ground 5 having a flat surface, sliding bodies 7 and 8 made of a plate-like resin foam laminated on the upper surface of the artificial ground 5, and an upper sliding body (upper sliding body) 8. The solid base 9 is laminated and polymerized on the upper surface.

In this embodiment, the artificial ground 5 is formed of the walnut stone 4 filled with a height of about 120 mm and the discarded concrete 6 of about 30 mm thick placed on the surface thereof. Concrete may be formed on the bottom of the cut portion 3 by placing it at a constant thickness.
In short, it is preferable that the surface of the artificial ground 5 is flat with no irregularities, and is as flat as possible so that the mounted sliding body can move smoothly in the horizontal direction.

  In this embodiment, the sliding bodies 7 and 8 are laminated in two stages in the vertical direction, and both are made of a resin foam containing fine bubbles such as polyethylene or styrene.

  The resin itself originally has slidability, but when it is molded into a foam, it is roughened by the fine bubbles contained and the slidability is impaired. A layer is formed to improve the sliding property.

  The sliding bodies 7 and 8 made of such a material have a sufficient supporting force against the vertical load from the upper structure (detached house) in normal times, and the sliding contact surface in the vertical direction during an earthquake. From the viewpoint of generating smooth sliding in the horizontal direction, each of the sliding bodies 7 and 8 is subjected to a compressive strength obtained by a compression test by loading in a direction perpendicular to the plate surface in advance and a single-surface shear test in a direction parallel to the plate surface What obtained the obtained friction coefficient is used.

  The sliding bodies 7 and 8 are all laid on the surface of the artificial ground 5 without any gaps, and have a predetermined property in advance at a production factory or the like depending on the size or weight of the structure to be applied. From the viewpoint of selection of foamed product, sliding performance, workability, and portability, it is processed into a predetermined thickness and size.

  The sliding bodies 7 and 8 are laid without gaps in order to firmly support the building and ensure safety. The load from the top is dispersed as much as possible, and is generated inside the sliding body. The stress in the vertical direction can be reduced.

Furthermore, since a three-dimensional complex load acts on an earthquake, force can be transmitted smoothly so that the sliding body can perform its function as stably as possible.
If there is a gap between adjacent sliding bodies 7, 7, 8 and 8, dust, small animals / plants, underground sewage, etc. may enter the gap and promote deterioration from the surface of the sliding body. Therefore, these fears can be prevented by laying without gaps.

  The sliding bodies to be laminated on the artificial ground 5 are laminated so as to be at least two levels up and down, but there are no special restrictions even if there are three levels or more, so it is cost effective. It may be determined appropriately from the viewpoint of the above and the viewpoint of the strength of the ground.

At that time, each of the sliding bodies 7 and 8 has a thickness of about 30 to 300 mm and a size of 1000 to 3000 mm on one side. However, since there is no particular limitation on this point, the viewpoint of cost effectiveness and the ground What is necessary is just to judge suitably from a viewpoint of strength.
Note that the thicknesses of the upper and lower sliding bodies are not necessarily the same, and when they are stacked in three or more stages, the thickness of the sliding bodies interposed in the middle can be reduced.

The solid foundation 9 is laminated and polymerized on the surface of the upper-side sliding body 8, and the thickness of the foundation slab 9a is appropriately selected according to the weight of the building to be constructed. .
The solid foundation 9 has a connecting beam 9b having a required height and thickness integrally formed along the peripheral edge thereof, and the inner bottom surface of the slab foundation 9a and the connecting beam 9b have a triangular cross section. Although it is reinforced by the beam member 9c, the beam member may be a beam member having another shape. In short, the bottom surface may be a flat surface.

After excavating a root cutting portion 3 having a predetermined depth (about 300 mm in the embodiment) in accordance with the size of the house to be built on the ground 2 in the site, the height of the bottom portion of the root cutting portion 3 is increased. Spread the cracked stone 4 over the entire surface so that is about 120 mm.
Thereafter, concrete is poured onto the surface of the cracked stone 4 so that the thickness is about 30 mm, and the discarded concrete 6 is cast to form an artificial ground 5 having a thickness of about 150 mm.
At that time, it is preferable that the surface of the discarded concrete 6 is formed flat so as not to cause as large unevenness as possible.

After the discarded concrete 6 is dried and solidified, a sliding body 7 is first laid on the entire surface of the discarded concrete 6 without a gap.
The used sliding body 7 is a polyethylene resin foam having a thickness of about 30 mm and a size of 1000 mm on a side.

When the laying of the sliding body 7 on the artificial ground 5 is completed, a sliding body (upper sliding body) 8 made of the same material and having the same size is then laid on the upper surface of the sliding body 7.
At that time, the left and right boundary surfaces 7a, 8a of the sliding bodies 7, 8 loaded in the vertical direction Are located at the same position, when the upper stage and the lower stage are displaced relative to each other during an earthquake, the upper and lower boundary surfaces 7a and 8a may interfere with each other and the sliding bodies 7 and 8 may be damaged.
Therefore, as shown in FIG. 2, the position of the boundary surface 8a between the upper sliding bodies 8 and 8 and the position of the boundary surface 7a between the lower sliding bodies 7 and 7 are laid so as not to be close to each other. Is.

The laying of the sliding body 8 on the surface of the artificial ground 5 can also be started from the inner surface of the root cutting portion 3.
In this case, since the laid sliding body 8 can hardly be moved in the horizontal direction, a necessary gap 12 (about 30 mm in the embodiment, but usually about 300 to 800 mm) exists from the inner surface. Lay.

  In the construction ground structure 1 having such a configuration and capable of suppressing the earthquake motion, when an S wave arrives at the time of the earthquake, the construction ground structure 1 is first transmitted to the sliding body 7 that is laid on the artificial ground 5 without any gaps. Since the artificial ground 5 slides in the horizontal direction at the same time and absorbs or reduces the shaking caused by the earthquake, the building hardly shakes in the case of an earthquake with a small seismic intensity.

On the other hand, in the case of an earthquake with a large seismic intensity, since the sliding body 7 alone cannot absorb the shaking, the shaking is also transmitted to the upper sliding body 8, and the sliding body 7 and the sliding body 8 slide in the horizontal direction. since the relative movement, Ru can absorb the seismic waves to some extent, ground motion is transmitted is reduced to a solid foundation 9, it is possible to mitigate the shaking of the building itself.

However, if the upper sliding body 8 moves in the horizontal direction regardless of the magnitude of the seismic intensity, the building may be shaken by, for example, strong winds, so only when the seismic intensity exceeds a certain value, It is preferable that the sliding body 8 on the upper side is slid in the horizontal direction.

  At that time, how much earthquake motion the sliding bodies 7 and 8 are slid is determined in relation to the wind force that the building receives. It is also considered to add an anti-rolling device by wind.

  In addition, since the P wave of the ground motion in the vertical direction is directly transmitted to the sliding bodies 7 and 8 via the artificial ground 5, the impact resistance is exhibited by the total thickness of the sliding bodies 7 and 8, and the impact is alleviated. I can expect that.

In FIG. 2, reference numeral 11 denotes a columnar restoration assisting member (hereinafter also referred to as “buffer member”) made of an elastic body such as rubber that is vertically fixed to the surface portion of the artificial ground 5.
After the columnar portion of the buffer member 11 is passed through the gaps 7b and 8b formed at the required positions of the sliding bodies 7 and 8 stacked on the upper and lower sides and at opposite positions, the tip portion is placed on the artificial ground. The sliding bodies 7 and 8 which are fixedly attached to the upper surface portion 5 and moved in the horizontal direction are returned to their original positions.
In addition, a seal (not shown) may be provided on the upper portion of the gap 8b formed in the upper sliding body 8 so as to prevent unnecessary pieces of concrete from entering the gaps 8b and 7b, thereby closing the gap 8b. preferable.

Further, at least when the upper sliding body 8 slides in the horizontal direction, the smooth sliding is not hindered in the gap 12 formed between the inner peripheral surface of the root cutting portion 3 and the outer peripheral surface of the solid base 9. Thus, it is preferable to completely close the gap 12 by filling the elastic plate-like body having the required thickness and size or the filler 13 having elasticity for buffering.
At that time, it is preferable to close the opening of the gap 12 by providing a filler cover 14 at the opening of the gap 12.

  In this embodiment, the sliding bodies 7 and 8 are interposed between the artificial ground 5 and the solid foundation 9 in two upper and lower stages, but the sliding body laid on the surface of the artificial ground 5 without a gap. Is required to be at least one step above, and three layers are provided between the illustrated sliding bodies 7 and 8 with a sliding body having the same size and thickness or a sliding body having different properties, sizes and thicknesses. It is also possible to laminate more than that.

In this case, since the thickness of the entire sliding body stacked in the vertical direction is increased, the absorption of the seismic intensity with respect to the P wave is increased, the heat insulation effect is improved, and the effect of ground improvement can be obtained. The overall thickness and the like are set based on the properties of the ground, the size of the house, and the load applied to the fabric foundation and the ground side foundation.

An architectural ground structure and a construction method capable of suppressing seismic motion according to the present invention are configured by interposing a sliding body made of a resin foam between an artificial ground and a solid foundation in the vertical direction. Therefore, as long as the sliding body can withstand the load from the upper part, it can be used regardless of whether it is a wooden building or a concrete building.

1 Ground structure that can suppress seismic motion 2 Ground 3 Root cutting part 4 Cracked stone 5 Artificial ground 6 Abandoned concrete 7 Sliding body
8 Sliding body (Upper sliding body)
9 Solid foundation 10 Base 11 Restoration auxiliary member (buffer member)
12 Gap 13 Filling material 14 Cover member

Claims (8)

In the root cutting part formed in the ground, the whole surface forms an artificial ground,
On the surface of the artificial ground, a plurality of sliding bodies made of a plate-like resin foam previously processed to have a required shape, thickness, and size are provided between the inner side surface of the root cutting portion. With a gap, laying the entire surface without any gaps,
Wherein the upper surface of the sliding body laid on the root cutting portion, an upper sliding body made of the same material and shape, at least one or more stages, such that adjacent boundary surfaces of the upper sliding body is not close to each other in the vertical direction There is a required gap between the inner surface of the root cutting part, and the entire surface is laminated and spread.
The upper surface of the upper sliding body is brought into contact with the bottom surface of the solid foundation in which the entire bottom surface of the foundation slab is formed flat ,
The sliding bodies stacked on the top and bottom are engaged with a shock absorbing member arranged vertically between the artificial ground and the foundation concrete with a predetermined interval, and an earthquake motion is characterized. Suppressible architectural ground structure. The artificial ground is
The seismic motion according to claim 1, wherein the ground motion is configured by placing discarded concrete flat with a required thickness on a surface of a cracked stone laid flat with a predetermined thickness in the root cutting portion. Suppressible architectural ground structure. The sliding bodies stacked above and below are
The building ground capable of suppressing earthquake motion according to claim 1, wherein a compressive strength obtained by a compression test by loading in a perpendicular direction and a friction coefficient obtained by a one-side shear test in a parallel direction are maintained. Construction. In the gap formed between the edge of the sliding body laid on the artificial ground and the inner surface of the root cutting part, a plate-like resin foam is laminated vertically. The architectural ground structure capable of suppressing earthquake motion according to claim 1 . The gap is
Its upper opening, ground motion can suppress building ground structure according to claim 1 or 4, characterized in that it is covered with a cover member. The sliding body is
The building ground structure capable of suppressing earthquake motion according to any one of claims 1 to 5 , comprising a resin foam containing fine bubbles of polyethylene or styrene. The solid foundation is
The inner surface of a connecting beam formed integrally along the periphery of a flat foundation slab and the inner bottom surface of the foundation slab are integrally connected by a beam member having a triangular cross section. The building ground structure which can suppress the earthquake motion of Claim 1. After excavating a root cutting part with the required size and depth on the ground to build the building,
In the root cutting part, the artificial ground having a flat surface with a required thickness is formed over the entire surface,
On the surface of the artificial ground, and presence of the required interval between at least the inner side surface of the root cutting portion, a plurality of sliding body comprising a plate-like resin foam having a size of desired thickness, without a gap While laying,
Adjacent boundaries of each upper sliding body with a required gap between the upper sliding body made of the same material and shape on the upper surface of the sliding body and at least one step between the inner surface of the root cutting part Laminate and spread over the entire surface so that the surfaces are not close to each other in the vertical direction,
The sliding bodies stacked above and below are engaged with a cushioning member disposed vertically between the artificial ground and the foundation concrete with a predetermined interval,
After that, the top surface of the upper sliding body is formed by bringing the bottom surface portion of the solid foundation in which the entire bottom surface portion of the foundation slab is formed into contact with each other. Construction method.

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