JPH0759810B2 - Ground improvement method for foundation - Google Patents
Ground improvement method for foundationInfo
- Publication number
- JPH0759810B2 JPH0759810B2 JP11314287A JP11314287A JPH0759810B2 JP H0759810 B2 JPH0759810 B2 JP H0759810B2 JP 11314287 A JP11314287 A JP 11314287A JP 11314287 A JP11314287 A JP 11314287A JP H0759810 B2 JPH0759810 B2 JP H0759810B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- foundation
- topsoil
- improved
- reinforcing material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、軟弱地盤に起因する軽量建物の不等沈下また
はコンクリート基礎の破壊防止を目的とする基礎用地盤
改良工法に関する。Description: TECHNICAL FIELD The present invention relates to a ground improvement method for foundation for the purpose of preventing uneven settlement of a lightweight building or destruction of a concrete foundation due to soft ground.
(従来の技術) 軟弱地盤上に住宅等に建物を建造する場合、この軟弱地
盤に固化材を添加すること等により予め地盤を改良し、
軟弱地盤に起因する軽量建物の不等沈下またはコンクリ
ート基礎の破壊を防止していた。そして、従来、地盤の
改良は、建物が建てられる敷地全範囲を対象として行わ
れていた。(Prior Art) When building a building on a soft ground such as a house, the ground is improved in advance by adding a solidifying material to the soft ground,
It prevented uneven settlement of lightweight buildings or destruction of concrete foundations due to soft ground. Then, conventionally, the ground improvement has been performed on the entire site area where the building is built.
(発明が解決しようとする問題点) 固化材を添加することによって改良した地盤は圧縮強度
・剪断強度はあるものの引張強度は全くなかった。従っ
て、地盤が不等沈下を起こすと曲がり部において地盤に
クラックが入ったりする問題があった。(Problems to be Solved by the Invention) Although the ground improved by adding a solidifying material has compressive strength and shear strength, it has no tensile strength at all. Therefore, there is a problem that the ground is cracked at the bend when the ground is unevenly subsided.
また、建物の不等沈下またはコンクリート基礎の破壊を
防止するために地盤の強度が必要な所は基礎が配置され
る所であり、他の位置については必ずしも固化材を添加
する等の大がかりな地盤改良が必要でない。よって、従
来のように敷地全範囲にわたって地盤の改良を行うと、
固化材等の材料が多く要るとともに、施工時間がかかる
ため施工コストが高くなるという問題があった。In addition, the place where the ground strength is necessary to prevent uneven settlement of the building or the destruction of the concrete foundation is the place where the foundation is placed, and at other positions, it is not necessary to add a solidifying material etc. No improvement needed. Therefore, if the ground is improved over the entire area of the site as before,
There is a problem that a large amount of material such as a solidifying material is required and that the construction cost is high due to the long construction time.
(問題点を解決するための手段) 本発明は、現状地盤の基礎が設けられるところのみを掘
削して表土を取除き、この表土を取除いた地盤のベース
底に格子状、網目状等に形成した補強材を配置し、この
補強材の上に質のよい新たな土砂を適当な厚さに敷設
し、この新たな土砂と固化材を混合撹拌した後に転圧し
て基礎用地盤となす基礎用地盤改良工法である。(Means for Solving the Problems) The present invention is to excavate only the place where the foundation of the present ground is provided to remove the topsoil, and to form a grid, a mesh or the like on the base bottom of the ground from which the topsoil is removed. Place the formed reinforcing material, lay a new good quality earth and sand on this reinforcing material to an appropriate thickness, mix and stir the new earth and sand and the solidifying material, and then roll it to form the foundation ground. It is a ground improvement method.
(作用) 改良を目的とする現状地盤の基礎が配置される所のみを
改良し、この地盤上に住宅等の建物を建造可能にする。(Function) Only the place where the foundation of the current ground for improvement is placed is improved so that a building such as a house can be constructed on this ground.
(実施例) 以下、本発明の一実施例を図面を参照して説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
まず、第1図に示すように、基礎が設けられる部分を地
縄、白線2等によって現状地盤1上に明示する。この明
示した部分が現状地盤1の改良を行う改良部分3とな
る。また、改良部分3の改良幅3aは基礎の幅よりも広く
なるように余裕を持たせて設定するのが好ましい。図中
の符号5は遣方であって、この遣方5は改良幅3a等を考
慮し、建物が建てられる位置から通常よりも離して設け
られている。この遣方5は、改良した基礎用地盤14の上
にコンクリート基礎を形成するとき、コンクリート基礎
のセンター合わせをしたりする水糸を張りわたすための
ものである。First, as shown in FIG. 1, the portion where the foundation is provided is clearly indicated on the current ground 1 by the ground rope, the white line 2, and the like. This clearly defined portion is an improved portion 3 for improving the current ground 1. Further, it is preferable that the improved width 3a of the improved portion 3 is set with a margin so as to be wider than the width of the foundation. Reference numeral 5 in the drawing is a usage method, and this usage method 5 is provided away from the position where the building is built in consideration of the improvement width 3a and the like. This method 5 is for stretching a water thread for centering the concrete foundation when forming the concrete foundation on the improved foundation ground 14.
次に、第2図及び第3図に示すように、掘削機6によっ
て改良部分3を掘削する。現状地盤1の基礎が設けられ
るところのみを掘削して表土7を取除く。図中の符号7a
は取除いた表土である。Next, as shown in FIGS. 2 and 3, the improved portion 3 is excavated by the excavator 6. Excavate only the place where the foundation of the current ground 1 is provided and remove the topsoil 7. Reference numeral 7a in the figure
Is the removed topsoil.
取除く表土7aの厚さは表土7の軟弱性を考慮して200mm
でよい場合もあるし、700mmくらい必要である場合もあ
る。The thickness of the removed topsoil 7a is 200 mm in consideration of the softness of the topsoil 7.
In some cases, it may be good, and in other cases, it may be necessary to have about 700 mm.
このように表土7を取除いた地盤のベース底8の上に格
子状、網目状等に形成した補強材9を配設する(第4図
参照)。In this way, the reinforcing material 9 formed in a lattice shape, a mesh shape or the like is arranged on the base bottom 8 of the ground from which the top soil 7 has been removed (see FIG. 4).
補強材9として、例えばプラスチック、鉄筋、竹、ロー
プ、布等が用いられる。補強材9は、格子状、網目状に
形成されたものを基本とするが、その他、単一方向に組
まれたものであってもよい。As the reinforcing material 9, for example, plastic, rebar, bamboo, rope, cloth or the like is used. The reinforcing material 9 is basically formed in a grid shape or a mesh shape, but may be assembled in a single direction.
このように補強材9を配設したベース底8の上に、質の
よい新たな土砂10を適当な厚さ敷設するとともに、この
質のよい新たな土砂10の上に適量の固化材11を散布する
(第5図参照)。On the bottom 8 of the base where the reinforcing material 9 is arranged in this way, a new quality sand 10 is laid in an appropriate thickness, and an appropriate amount of the solidifying material 11 is placed on the new quality sand 10. Scatter (see Figure 5).
質のよい新たな土砂10として、水はけのよい山砂、川
砂、海砂、まさ土等の単体あるいは混合されたものが好
適である。As the high-quality new earth and sand 10, it is preferable to use well-drained mountain sand, river sand, sea sand, Masa earth, etc., alone or in combination.
固化材11として、地盤安定化処理剤やセメント等が単独
あるいは混合して用いられる。地盤安定化処理剤とし
て、例えば、フジベトン(京王科研工業株式会社の商品
名)あるいはアサノクリーンセット1140(日本セメント
株式会社の商品名)等が好適である。As the solidifying material 11, a ground stabilization agent, cement or the like is used alone or as a mixture. As the ground stabilization agent, for example, Fuji Beton (trade name of Keio Kaken Kogyo Co., Ltd.) or Asano Clean Set 1140 (trade name of Nippon Cement Co., Ltd.) is suitable.
適量の固化材11を散布した質のよい新たな土砂10を掘削
機6等を用いて混合撹拌することによって改良土12とす
る(第6図参照)。An improved soil 12 is obtained by mixing and stirring new quality sand 10 with an appropriate amount of solidifying material 11 dispersed therein using an excavator 6 or the like (see FIG. 6).
このように混合撹拌した改良土12の表面を、例えば掘削
機6のバケット等によって均らすとともに、改良土12を
仮転圧する。The surface of the improved soil 12 thus mixed and stirred is leveled by, for example, a bucket of the excavator 6, and the improved soil 12 is temporarily rolled.
仮転圧が終了後、改良土12のレベルを測定し、レベル差
が大きいところ、あるいは混合むらがあるところなどを
作業者によって修正する。After the temporary rolling pressure is completed, the level of the improved soil 12 is measured, and the operator corrects the place where the level difference is large or the place where there is uneven mixing.
このレベル差等の修正の後、改良土12をローラ等(図示
省略)を用いて本転圧する。After the correction of the level difference and the like, the improved soil 12 is fully compacted by using a roller or the like (not shown).
本転圧終了後に、改良土12の上に水を散布して含水比を
調整する。After the completion of this compaction, water is sprinkled on the improved soil 12 to adjust the water content ratio.
適当な養生期間をとることによって上地盤13を構成す
る。The upper ground 13 is constructed by taking an appropriate curing period.
このようにベース底8に配設した補強材9の上に改良し
た上地盤13を構成することによって基礎用地盤14となさ
れる(第7図参照)。In this way, by constructing the improved upper ground 13 on the reinforcing member 9 arranged on the base bottom 8, the ground 14 for foundation is formed (see FIG. 7).
なお、上地盤13は複数層に分けて形成し、この各層の間
にそれぞれ補強材9を配設してもよい。The upper ground 13 may be formed by being divided into a plurality of layers, and the reinforcing material 9 may be arranged between the respective layers.
第8図は、このように構成した基礎用地盤14が不等沈下
等によって曲がった状態を示している。図中の符号A,B,
Cに特に引張力が発生する。FIG. 8 shows a state in which the foundation ground 14 thus constructed is bent due to uneven settlement or the like. Reference symbols A, B, in the figure
Especially tensile force is generated in C.
このように地盤が曲がっても、補強材9が分担して土の
引張力を抑えるため、地盤としての剛性が高まり、クラ
ックは発生しない。Even when the ground is bent in this way, the reinforcing material 9 shares the tensile force of the soil and the rigidity of the ground is increased, and cracks do not occur.
(発明の効果) 軟弱な表土を取除いた地盤の上に格子状、網目状等に形
成された補強材を配設し、この補強材の上に質のよい新
たな土砂を敷設して改良した上地盤を構成する。従っ
て、圧縮強度・剪断強度を高めるとともに、引張強度を
も高めた基礎用地盤となすことができる。(Effect of the invention) Reinforcing material formed in a grid or mesh shape is arranged on the ground from which the soft topsoil has been removed, and new high quality earth and sand is laid on this reinforcing material for improvement. The upper ground which was done is constituted. Therefore, it is possible to obtain a foundation ground having improved compressive strength / shear strength and tensile strength.
基礎が構築される部分のみの地盤を改良しているから、
経済的である。Since we are improving the ground only in the part where the foundation is constructed,
It is economical.
この地盤は、例えば不等沈下が生じても、引張強度があ
るため、地盤にクラック等が入らない。従って、このよ
うな地盤に基礎を築いた建物は安定する。Even if uneven subsidence occurs, the ground has tensile strength, so that the ground does not crack. Therefore, a building laid on such a ground is stable.
図面は本発明基礎用地盤改良工法の実施例を示し、第1
図は基礎が設けられる部分を地縄、白線等によって現状
地盤の上に明示した斜視図、第2図ないし第7図は基礎
用地盤改良工法の実施手順を示し、第2図は掘削機を用
いて表土を取除く作業を示す側面図、第3図は表土を取
除いた断面図、第4図は表土を取除いた地盤のベース底
上に補強材を配設した断面図、第5図は補強材を配設し
たベース底の上に質のよい新たな土砂及び固化材を入れ
た断面図、第6図は改良土の断面図、第7図は上地盤を
形成して基礎地盤となした断面図、第8図はこのように
して完成された基礎用地盤が不等沈下しても補強材によ
って土の引張力を抑えることを示す断面図である。 1……現状地盤、2……地縄、白線 3……改良部分、5……遣方 6……掘削機、7……表土 8……ベース底、11……固化材 9……補強材、10……質のよい新たな土砂 12……改良土、13……上地盤 14……基礎用地盤、A,B,C……引張力The drawings show an embodiment of the ground improvement method for foundation of the present invention.
The figure is a perspective view in which the part where the foundation is installed is clearly shown on the present ground by the ground rope, the white line, etc., Figures 2 to 7 show the procedure for implementing the ground improvement method for the foundation, and Figure 2 shows the excavator. Fig. 3 is a side view showing the work of removing the topsoil by using it, Fig. 3 is a cross-sectional view showing the topsoil removed, and Fig. 4 is a cross-section showing the reinforcing material arranged on the base bottom of the ground where the topsoil is removed. The figure shows a cross-sectional view of a new base material with reinforcing material placed on top of a new soil and solidifying material, Fig. 6 shows a cross-sectional view of the improved soil, and Fig. 7 shows the upper ground to form the foundation ground. 8 is a cross-sectional view showing that the reinforcing material suppresses the tensile force of the soil even if the foundation ground thus completed is unevenly settled. 1 …… Current ground, 2 …… Ground rope, white line 3 …… Improved part, 5 …… How to use 6 …… Excavator, 7 …… Soil 8 …… Base bottom, 11 …… Solid material 9 …… Reinforcement material , 10 …… New high quality earth and sand 12 …… Improved soil, 13 …… Upper ground 14 …… Foundation ground, A, B, C …… Tensile force
Claims (1)
掘削して表土を取除き、この表土を取除いた地盤のベー
ス底に格子状、網目状等に形成した補強材を配設し、 この補強材の上に質のよい新たな土砂を適当な厚さに敷
設し、この新たな土砂と固化材を混合撹拌した後に転圧
して基礎用地盤となすことを特徴とする基礎用地盤改良
工法。1. Excavating only the place where the foundation of the present ground is provided to remove the topsoil, and disposing a reinforcing material formed in a lattice shape, a mesh shape or the like on the base bottom of the ground where the topsoil is removed. Ground improvement for the foundation characterized by laying new quality sand on this reinforcing material to an appropriate thickness, mixing and stirring this new earth and solidifying material, and then compacting it to form the foundation ground. Construction method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11314287A JPH0759810B2 (en) | 1987-05-09 | 1987-05-09 | Ground improvement method for foundation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11314287A JPH0759810B2 (en) | 1987-05-09 | 1987-05-09 | Ground improvement method for foundation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63280114A JPS63280114A (en) | 1988-11-17 |
JPH0759810B2 true JPH0759810B2 (en) | 1995-06-28 |
Family
ID=14604632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11314287A Expired - Fee Related JPH0759810B2 (en) | 1987-05-09 | 1987-05-09 | Ground improvement method for foundation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0759810B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0453838U (en) * | 1990-09-11 | 1992-05-08 | ||
JP2553800B2 (en) * | 1992-03-31 | 1996-11-13 | ミサワホーム株式会社 | Foundation construction method |
JPH07317055A (en) * | 1994-05-26 | 1995-12-05 | Elf:Kk | Method of foundation improvement construction |
-
1987
- 1987-05-09 JP JP11314287A patent/JPH0759810B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS63280114A (en) | 1988-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |