JP3720937B2 - Foundation structure of the building - Google Patents
Foundation structure of the building Download PDFInfo
- Publication number
- JP3720937B2 JP3720937B2 JP35505796A JP35505796A JP3720937B2 JP 3720937 B2 JP3720937 B2 JP 3720937B2 JP 35505796 A JP35505796 A JP 35505796A JP 35505796 A JP35505796 A JP 35505796A JP 3720937 B2 JP3720937 B2 JP 3720937B2
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- building
- foundation
- ground
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Description
【０００１】
【発明の属する技術分野】
本発明は建造物の基礎構造に関し、詳しくは地震時に有効に対処可能な建造物の基礎構造に関するものである。
【０００２】
【従来の技術】
従来の建造物の基礎構造は、軟弱地盤上に建てる場合、地盤を固化材等で固めて地盤改良を行い、この改良地盤上に建造物の基礎の施工をしている。
【０００３】
【発明が解決しようとする課題】
近年、埋め立て地等、軟弱地盤上の造成地が増えているが、軟弱地盤上に建てられた家屋は硬い地盤上に建てられたものに比べ、大きな地震で沈下したり傾いたりする可能性が非常に大きいのである。
【０００４】
そして、地盤調査結果に基づき、基礎の補強工事も行われているが、それは平常時の地耐力の向上を主目的としており、耐震性まで考慮した場合は基礎にかかる費用が莫大になり、上に建てられる家屋の建設費用とのバランスが取れないことが多い。
【０００５】
しかし、大きな地震の時、もしも基礎が折れるような不同沈下が発生すれば、当然ながら家屋の方にも亀裂や歪み等の現象が生じる。
このように、基礎が折れるような事態に至る可能性を少なくするには、基礎の剛性を高め強固にしなければならない。
そこで、基礎下の地盤を、セメント系の固化材で固める地盤改良を行っているが、地盤改良をすることで、それ自体にも耐震性に対する向上はあるものの、地震の規模次第では、やはり、家屋が沈下したり、傾くことも十分に考えられる。
【０００６】
そして、家屋が一旦沈下したり傾いた場合、修正するのが著しく困難であり、一般的には基礎の下を部分的に掘り下げ、鋼管杭やコンクリートでジャッキの反力を設け、ジャッキを設置して持ち上げる方法で修正するか、又はジャッキの代わりに耐圧用グラウトジャケットを設置して、グラウト注入による圧力で家屋を持ち上げ修正しなければならないが、何れにしても、家屋の床下は狭くて作業がしづらい上、改良地盤は固くて容易に掘ることができない。
又、床下での作業が困難な時は、床や壁の一部を壊して大掛かりな作業となっていたのである。
【０００７】
上記点より本発明は、大きな地震等で改良地盤上に建造された家屋等が沈下したり、傾いたりしても簡単に修正することが可能な建造物の基礎構造を提供しようとするものである。
【０００８】
【課題を解決するための手段】
上記課題を解決するため本発明は、布基礎の下面と改良地盤の上面の間に均しコンクリートが打設され、この均しコンクリートに所定の間隔を於いて、耐圧用グラウトジャケット敷設用の間隙が均しコンクリートの延長方向に直交して設けられ、この間隙に取り出し可能な閉塞体が挿設されていることを特徴とするものである。
【０００９】
上記構成を有する本発明は、地震で建造物が沈下したり、傾いた場合は、建造物の外部より地表を掘り下げ、均しコンクリートの間隙に挿設されている閉塞体を引き抜き、引き抜いた後の間隙に、耐圧用グラウトジャケットを介入し敷設する。
この耐圧用グラウトジャケットにグラウトを注入すれば、その圧力で耐圧用グラウトジャケットは膨らみ、布基礎の下面より沈下したり、傾いたりしている基礎を押し上げ建造物を修正できる。
又、耐圧用グラウトジャケットの下面となる改良地盤は固く、十分に膨らむ時の反力となり得る。
又、通常時は間隙に閉塞体が挿設されているため土で間隙が埋まることは防止される。
【００１０】
【発明の実施の形態】
以下、本発明の一実施の形態を図面に基づき説明する。
図１は本発明建造物の基礎構造の一実施の形態を示す正面図、図２は同上の部分拡大斜視図、図３は同上の閉塞体を取り除いた状態の斜視図、図４は同上の耐圧用グラウトジャケット使用時の断面図である。
【００１１】
而して、図中１は改良地盤であり、セメント系の固化材で固められている。
セメント系固化材の添加量は、８０〜１５０ｋｇｆ／ｍ3程度で土の状態に合わせ調節する。
改良地盤１の固さは、一軸圧縮強度ｑｕ＝２．０〜３．０ｋｇｆ／ｃｍ2程度
変形係数Ｅ＝１，５００〜５，０００ｔｆ／ｍ2程度とする。
【００１２】
２は改良地盤１上に施工された布基礎、３は布基礎２の下面と改良地盤１の上面の間に打設された均しコンクリート、４は均しコンクリート３に所定の間隔（１．８〜２．７ｍ）を於いて、均しコンクリート３の延長方向に直交して設けた間隙である。
間隙４は約４０ｃｍ位であり、この間隙４に取り出し可能な閉塞体５が挿設されている。
【００１３】
閉塞体５は前部及び後部の木枠５Ａと前後の木枠５Ａ間に止着した上面板５Ｂにより形成されている。
閉塞体５は布基礎２の側方より引き抜くことにより取り出し可能であり、閉塞体５を取り出した後の間隙４に耐圧用グラウトジャケット６が敷設されている。
尚、図中７は建造物、８は地表である。
【００１４】
【発明の効果】
本発明に依れば、建造物が大きな地震等で沈下したり、傾いたりしても、建造物の外部より地表を掘り下げ閉塞体を取り出し、取り出し後の間隙に耐圧用グラウトジャケットを敷設して、耐圧用グラウトジャケットにグラウトを注入し、布基礎を押し上げることにより簡単に建造物の修正が可能である。
又、耐圧用グラウトジャケットの下面となる改良地盤は固く、十分に膨らむ時の反力とりなり得るため、鋼管杭やコンクリート等の反力を必要としないので、床下の狭い場所での困難な作業がなくなるものである。
このように、本発明は基礎の施工時にあらかじめ地震等に対処し得るように準備してあるため、従来のように建造物が沈下したり傾いたりした後で対処しなければならなかった困難さに比べ、非常に簡単に建造物の沈下や傾斜の修正を行うことができる有用な発明である。
【図面の簡単な説明】
【図１】本発明建造物の基礎構造の一実施の形態を示す正面図である。
【図２】本発明建造物の基礎構造の一実施の形態を示す部分拡大斜視図である。
【図３】本発明建造物の基礎構造の閉塞体を取り除いた状態の斜視図である。
【図４】本発明建造物の基礎構造の耐圧用グラウトジャケット使用時の断面図である。
【符号の説明】
１ 改良地盤
２ 布基礎
３ 均しコンクリート
４ 間隙
５ 閉塞体
６ 耐圧用グラウトジャケット
７ 建造物
８ 地表[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a building foundation, and more particularly to a building foundation that can effectively cope with an earthquake.
[0002]
[Prior art]
When a conventional building foundation is built on soft ground, the ground is hardened with a solidifying material or the like to improve the ground, and the foundation of the building is constructed on the improved ground.
[0003]
[Problems to be solved by the invention]
In recent years, the number of land created on soft ground, such as landfills, has increased, but houses built on soft ground may sink or tilt due to large earthquakes compared to those built on hard ground. It is very big.
[0004]
Based on the ground survey results, foundation reinforcement work is also being carried out, which is mainly aimed at improving the earth bearing capacity during normal times. When considering earthquake resistance, the cost of the foundation becomes enormous. In many cases, it is not possible to balance the construction costs of houses built in
[0005]
However, in the event of a major earthquake, if a subsidence that breaks the foundation occurs, of course, phenomena such as cracks and distortion also occur in the house.
Thus, in order to reduce the possibility of reaching a situation where the foundation breaks, the rigidity of the foundation must be increased and strengthened.
Therefore, although the ground under the foundation is solidified with cement-based solidification material, the ground improvement itself has improved earthquake resistance, but depending on the magnitude of the earthquake, It is quite possible that the house will sink or tilt.
[0006]
And once the house sinks or tilts, it is extremely difficult to correct, and in general, partially digging under the foundation, providing a reaction force of the jack with steel pipe pile or concrete, and installing the jack However, in any case, the floor under the house is narrow and work is not possible. It is difficult and the improved ground is hard and cannot be dug easily.
In addition, when work under the floor was difficult, part of the floor and walls were broken and the work was extensive.
[0007]
In view of the above, the present invention is intended to provide a foundation structure of a building that can be easily corrected even if a house built on improved ground due to a large earthquake or the like sinks or tilts. is there.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a leveling concrete placed between the lower surface of the fabric foundation and the upper surface of the improved ground, and a gap for laying the pressure-proof grout jacket at a predetermined interval on the leveling concrete. Is provided perpendicular to the extending direction of the leveled concrete, and a removable body is inserted in the gap.
[0009]
The present invention having the above configuration, after the building sinks or tilts due to an earthquake, after digging the ground surface from the outside of the building, pulling out the closed body inserted in the gap of the leveled concrete, and pulling out A pressure-resistant grout jacket is laid in the gap between them.
By injecting grout into the pressure grout jacket, the pressure grout jacket swells with the pressure, and the foundation that has sunk or tilted from the lower surface of the cloth foundation can be corrected.
Further, the improved ground which is the lower surface of the pressure resistant grout jacket is hard and can be a reaction force when fully expanded.
In addition, since a closing body is inserted in the gap at normal times, the gap is prevented from being filled with soil.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the basic structure of a building of the present invention, FIG. 2 is a partially enlarged perspective view of the same, FIG. 3 is a perspective view of the same with the closing body removed, and FIG. It is sectional drawing at the time of using the grout jacket for pressure | voltage resistance.
[0011]
Thus,
The addition amount of the cement-based solidifying material is adjusted to about 80 to 150 kgf / m 3 according to the state of the soil.
The hardness of the improved
[0012]
2 is a fabric foundation constructed on the improved
The gap 4 is about 40 cm, and a
[0013]
The
The
In the figure, 7 is a building and 8 is the ground surface.
[0014]
【The invention's effect】
According to the present invention, even if the building sinks or tilts due to a large earthquake or the like, the ground surface is dug out from the outside of the building, the obstruction is taken out, and a pressure resistant grout jacket is laid in the gap after taking out. The building can be easily modified by injecting grout into the pressure resistant grout jacket and pushing up the fabric foundation.
In addition, the improved ground on the underside of the pressure resistant grout jacket is hard and can take a reaction force when fully inflated, so there is no need for a reaction force such as steel pipe pile or concrete, so it is difficult work in a narrow place under the floor Is something that disappears.
As described above, since the present invention is prepared in advance so as to cope with an earthquake or the like at the time of construction of the foundation, it has been difficult to deal with after the building has subsided or tilted as in the past. It is a useful invention that allows the settlement of buildings and the correction of slopes to be performed very easily compared to the above.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a foundation structure of a building of the present invention.
FIG. 2 is a partially enlarged perspective view showing an embodiment of the foundation structure of the building of the present invention.
FIG. 3 is a perspective view showing a state in which the blockage of the foundation structure of the building of the present invention is removed.
FIG. 4 is a cross-sectional view of the foundation structure of the building of the present invention when using a pressure resistant grout jacket.
[Explanation of symbols]
DESCRIPTION OF
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35505796A JP3720937B2 (en) | 1996-12-20 | 1996-12-20 | Foundation structure of the building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35505796A JP3720937B2 (en) | 1996-12-20 | 1996-12-20 | Foundation structure of the building |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10183644A JPH10183644A (en) | 1998-07-14 |
| JP3720937B2 true JP3720937B2 (en) | 2005-11-30 |
Family
ID=18441689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35505796A Expired - Lifetime JP3720937B2 (en) | 1996-12-20 | 1996-12-20 | Foundation structure of the building |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3720937B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4884308B2 (en) * | 2007-06-07 | 2012-02-29 | 住友林業株式会社 | Building subsidence correction method |
-
1996
- 1996-12-20 JP JP35505796A patent/JP3720937B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10183644A (en) | 1998-07-14 |
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