JPH02101226A - Foundation construction at soft ground - Google Patents

Foundation construction at soft ground

Info

Publication number
JPH02101226A
JPH02101226A JP25115988A JP25115988A JPH02101226A JP H02101226 A JPH02101226 A JP H02101226A JP 25115988 A JP25115988 A JP 25115988A JP 25115988 A JP25115988 A JP 25115988A JP H02101226 A JPH02101226 A JP H02101226A
Authority
JP
Japan
Prior art keywords
ground
piles
soft ground
foundation
fixed
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.)
Pending
Application number
JP25115988A
Other languages
Japanese (ja)
Inventor
Masumitsu Ito
伊藤 益光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimizu Construction Co Ltd
Shimizu Corp
Original Assignee
Shimizu Construction Co Ltd
Shimizu Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimizu Construction Co Ltd, Shimizu Corp filed Critical Shimizu Construction Co Ltd
Priority to JP25115988A priority Critical patent/JPH02101226A/en
Publication of JPH02101226A publication Critical patent/JPH02101226A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the liquefaction of the ground by forming fixed piles made of soil cement on the soft ground such as the water front, arranging reinforcing materials between them, and constructing a structure on the fixed piles serving as a foundation. CONSTITUTION:Stirring shafts with stirring blades at their tips are penetrated into the soft ground 1 until the tips reach the support foundation 5, slurry-shaped cement is filled into the earth through the tips, and the stirring shafts are extracted at a fixed speed while the original ground is stirred with the stirring shafts to construct fixed piles 3. When the fixed piles 3 are constructed to the preset height from the support foundation 5, the filling is stopped, and the stirring shafts are completely extracted under this condition. The sediment on the fixed piles 3 thus constructed is discharged on the ground, reinforcing materials are arranged between vertical piles formed on the fixed piles 3, and the sediment mixed with soil cement is back-filled around the vertical piles. The shearing force to the ground can be reduced.

Description

【発明の詳細な説明】 「産業上の利用分野」 この発明は、ウォーターフロントなどの軟弱地盤上に構
造物を構築する際の基礎工法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a foundation construction method when constructing a structure on soft ground such as a waterfront.

「従来の技術」 一般に、臨海部などのウォーターフロントは、立地条件
に優れていることから、各種の構造物を構築することが
望まれているが、このようなウォーターフロントはその
ほとんどが埋立地であるため、地盤が極めて軟弱で、そ
の上に中層以上の建築構造物を構築することは極めて困
難であった。
"Conventional technology" In general, waterfront areas such as coastal areas have excellent location conditions, so it is desirable to construct various structures, but most of these waterfronts are located on reclaimed land. As a result, the ground was extremely soft, making it extremely difficult to construct mid-rise or higher building structures on top of it.

このため、従来、ウォーターフロントのような軟弱地盤
上に中層以上の建築構造物を構築する場合には、例えば
、深層混合処理工法などの地盤改良工法によって軟弱地
盤中に複数の固結パイルを造成し、それによって地盤の
支持力を強化すると共に、地震時における液状化を防止
するようにしている。
For this reason, conventionally, when constructing a medium-rise or higher building structure on soft ground such as a waterfront, multiple consolidated piles are created in the soft ground using ground improvement methods such as deep mixing method. This not only strengthens the bearing capacity of the ground, but also prevents liquefaction during earthquakes.

「発明が解決しようとする課題」 ところで、上記のようにして造成された固結バイルは、
通常は地盤改良だけの目的で用いられるが、例えば固結
パイルをソイルセメントによって造成した場合、ある程
度の支持力を期待することができるため、上記固結パイ
ルを建築構造物の基礎としても利用することが考えられ
ている。
"Problem to be solved by the invention" By the way, the consolidated vile created as described above is
Normally, it is used only for the purpose of ground improvement, but for example, if a consolidated pile is made of soil cement, it can be expected to have a certain degree of bearing capacity, so the consolidated pile can also be used as the foundation of a building structure. That is what is being considered.

ところが、このようなソイルセメントからなる固結パイ
ルは、1〜2階建の建物の基礎とするには特に問題がな
いが、3〜6階建の中層の建物の基礎とした場合には、
建物の基礎に大きな水平力が掛かるため、ソイルセメン
) !2の固結バイルでは曲げ応力に耐えることができ
ないと考えられる。
However, although such a consolidated pile made of soil cement has no particular problem when used as the foundation for a 1- to 2-story building, when used as the foundation for a medium-rise building of 3 to 6 stories,
Because large horizontal forces are applied to the foundation of the building, soil cement)! It is considered that the consolidated pile No. 2 cannot withstand the bending stress.

そこで、この発明は、上記のような課題を有効に解決す
るため、ソイルセメントからなる固結パイル中に補強材
を配置することによって、固結バイルを中層量」二の建
築構造物の基礎としても利用できるようにすることを目
的としている。
Therefore, in order to effectively solve the above-mentioned problems, the present invention has developed a structure in which a reinforcing material is placed in a consolidated pile made of soil cement, and the consolidated pile can be used as the basis of a medium-layer building structure. The aim is to make it available as well.

1−課題を解決するための手段」 この発明の軟弱地盤における基礎工法は、ウォーターフ
ロントなどの軟弱地盤上に構築される構造物の基礎工法
であって、上記軟弱地盤中にソイルセメントからなる固
結バイルを造成すると共にこの固結バイル中に補強材を
配置し、次いでその固結バイルを基礎として該固結バイ
ルの上部に構造物をh’4築するものである。
1-Means for Solving the Problems The foundation construction method on soft ground of the present invention is a foundation construction method for a structure constructed on soft ground such as a waterfront, and is a foundation construction method for a structure constructed on soft ground such as a waterfront. A consolidated pile is created, a reinforcing material is placed in the consolidated pile, and then a structure is constructed on top of the consolidated pile using the consolidated pile as a foundation.

[゛作用 」 この発明の軟弱地盤における基礎工法においては、ウォ
ーターフロントなどの軟弱地盤中にソイルセメントから
なる固結バイルを造成し、次いでその固結バイルを基礎
として該固結バイルの上部に構造物を構築することによ
って、地震時に地盤内に働く水平方向の剪断力をソイル
セメントに負担させ、それによって、地盤に加わる剪断
力を低減させて地盤の液状化を防止する。また、上記固
結バイルをソイルセメント中に補強材を配置した構成と
することによって、固結バイルの曲げ応力に対する抵抗
性を増加させ、これによって、上記固結バイルを中層以
上の建物の基礎として利用することができるようにして
いる。
[Function] In the foundation construction method for soft ground of this invention, a consolidated pile made of soil cement is created in soft ground such as a waterfront, and then a structure is built on top of the consolidated pile using the consolidated pile as a foundation. By constructing something, soil cement bears the horizontal shear force that acts in the ground during an earthquake, thereby reducing the shear force applied to the ground and preventing liquefaction of the ground. In addition, by configuring the consolidated pile with a reinforcing material placed in the soil cement, the resistance of the consolidated pile to bending stress is increased. I am making it available for use.

「実施例」 以下、この発明の一実施例を第1図を参照して説明する
"Embodiment" An embodiment of the present invention will be described below with reference to FIG.

この実施例の軟弱地盤における基礎工法は、ウォーター
フロントなどの軟弱地盤l上に構築される建築構造物2
 (構造物)の基礎工法であって、上記軟弱地盤1中に
ソイルセメントからなる固結バイル3を造成すると共に
この固結パイル3中に補強材4を配置し、次いでその固
結バイル3を基礎として該固結バイル3の上部に構造物
を構築するものである。
The foundation construction method for soft ground in this example is applicable to building structures constructed on soft ground such as waterfronts.
(Structure) foundation construction method, in which a consolidated pile 3 made of soil cement is created in the soft ground 1, reinforcing material 4 is placed in this consolidated pile 3, and then the consolidated pile 3 is A structure is constructed on top of the consolidated pile 3 as a foundation.

上記補強材4としては、通常は、合成繊維、鋼Ti維等
の短繊維、またはジオテキスタイル、鉄筋なとが用いら
れるが、ソイルセメントの曲げ応力に対する抵抗性を増
加させることのできるものであれば、どのようなものを
用いても差し支えない。
As the reinforcing material 4, synthetic fibers, short fibers such as steel Ti fibers, geotextiles, reinforcing bars, etc. are usually used, but as long as they can increase the resistance to bending stress of soil cement. , you can use whatever you want.

なお、この実施例の固結バイル3では、特に曲げモーメ
ントが大きい地表に近い部分だけに補強材4が配置され
ているが、この補強材4は、場合によっては支持基盤5
に近い部分だけに配置しても良く、また、固結バイル3
の全長に亙って配置するようにしても差し支えない。
In addition, in the consolidated pile 3 of this embodiment, the reinforcing material 4 is arranged only in the part near the ground surface where the bending moment is especially large, but this reinforcing material 4 may be attached to the supporting base 5 in some cases.
It may be placed only in the area close to the solidified vile 3.
There is no problem even if it is arranged over the entire length of.

次に、この基礎工法についてさらに詳細に説明する。Next, this foundation construction method will be explained in more detail.

まず、先端に撹拌翼を有する撹拌軸を軟弱地盤l中に貫
入してその先端を支持基盤5上まで到達させ、次いてそ
の先端から地中に粉末状またはスラリー状のセメントを
注入しながら、上記撹拌軸で原地盤を撹拌しつつ一定速
度で引き抜きを行なうことによって、固結バイル3を造
成する。
First, a stirring shaft having a stirring blade at the tip is penetrated into the soft ground l, and its tip reaches above the support base 5, and then, while injecting cement in the form of powder or slurry into the ground from the tip, A consolidated pile 3 is created by stirring the original ground with the stirring shaft and pulling it out at a constant speed.

また、上記固結バイル3中に補強材4を配置する場合に
は、例えば上記撹拌軸の引き抜きを行なう際に、上記支
持基盤5から所定高さまでの固結バイル3を造成したと
ころでセメントの注入を止め、その状態で撹拌軸の引き
抜きを行うことによってその撹拌軸を完全に引き抜く。
In addition, when placing the reinforcing material 4 in the solidified pile 3, for example, when pulling out the stirring shaft, cement is poured after the solidified pile 3 is built up to a predetermined height from the support base 5. By stopping the stirring shaft and pulling out the stirring shaft in this state, the stirring shaft can be completely pulled out.

このようにした後、既に造成された固結バイル3上の土
砂を地−ヒに排出し、その固結バイル3上に形成される
立坑に鉄筋等の補強材を配置する。同時に、上記立坑を
形成する際に排出された土砂に、適宜の手段によりセメ
ントを混合してソイルセメントを調整し、このソイルセ
メントを上記立坑に埋め戻す。そして、このようにして
固結バイル3を地表面まで造成した後、この固結バイル
3を基礎として、この固結バイル3上に建築構造物2を
構築する。
After doing this, the earth and sand on the already constructed consolidation pile 3 is discharged to the ground, and reinforcing materials such as reinforcing bars are placed in the shaft formed above the consolidation pile 3. At the same time, soil cement is prepared by mixing cement with the earth and sand discharged when forming the shaft by an appropriate means, and the soil cement is backfilled into the shaft. After the consolidated pile 3 is built up to the ground surface in this way, the building structure 2 is built on the consolidated pile 3 using this consolidated pile 3 as a foundation.

「発明の効果」 この発明の軟弱地盤における基礎工法によれば、ウォー
ターフロントなどの軟弱地盤中にソイルセメントからな
る固結バイルを造成し、次いでその固結バイルを基礎と
して該固結バイルの上部に構造物を構築するので、地震
時に地盤内に働く水平方向の剪断力をソイルセメントに
負担させることができ、それによって、地盤に加わる剪
断力を低減して、地盤の液状化を防止することができる
"Effects of the Invention" According to the foundation construction method for soft ground of this invention, a consolidated pile made of soil cement is created in soft ground such as a waterfront, and then the upper part of the consolidated pile is built using the consolidated pile as a base. Since the structure is constructed in the same way, the soil cement can bear the horizontal shear force that acts in the ground during an earthquake, thereby reducing the shear force applied to the ground and preventing liquefaction of the ground. Can be done.

その上、上記固結バイルをソイルセメント中に補強材を
配置した構成とすることによって、固結バイルの曲げ応
力に対する抵抗性を増加させるようにしたので、その固
結バイルによって地震時における地盤の液状化を防止す
ることができると共に、該固結バイルを中層以上の建物
の基礎として有効に利用することができる。
Furthermore, by configuring the above-mentioned consolidated pile with reinforcing material placed in the soil cement, the consolidation pile's resistance to bending stress is increased. Not only can liquefaction be prevented, but also the consolidated pile can be effectively used as a foundation for a building of medium or higher rise.

また、この基礎工法では、地盤改良工事を行うことによ
って同時に基礎工事も行なわれることになるため、軟弱
地盤における構造物の施工を簡略化することができ、こ
れにより工期の短縮および施工コストの低減化を図るこ
とができる。
In addition, with this foundation construction method, foundation work is also performed at the same time as ground improvement work, which simplifies the construction of structures on soft ground, thereby shortening the construction period and reducing construction costs. It is possible to aim for

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、この発明の一実施例を示す図あって、軟弱地
盤における基礎工法を説明する説明図である。 l・・・・・・軟弱地盤、 2・・・・・・建築構造物 3・・・・・・固結バイル 4・・・・・・補強材。
FIG. 1 is a diagram showing an embodiment of the present invention, and is an explanatory diagram illustrating a foundation construction method on soft ground. l...Soft ground, 2...Building structure 3...Consolidation pile 4...Reinforcement material.

Claims (1)

【特許請求の範囲】[Claims] ウォーターフロントなどの軟弱地盤上に構築される構造
物の基礎工法であって、上記軟弱地盤中にソイルセメン
トからなる固結パイルを造成すると共にこの固結パイル
中に補強材を配置し、次いでその固結パイルを基礎とし
て該固結パイルの上部に構造物を構築することを特徴と
する軟弱地盤における基礎工法。
This is a foundation construction method for structures built on soft ground such as waterfronts, in which a consolidated pile made of soil cement is created in the soft ground, reinforcing material is placed in this consolidated pile, and then the A foundation construction method for soft ground, which is characterized by building a structure on top of a consolidated pile using a consolidated pile as a foundation.
JP25115988A 1988-10-05 1988-10-05 Foundation construction at soft ground Pending JPH02101226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25115988A JPH02101226A (en) 1988-10-05 1988-10-05 Foundation construction at soft ground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25115988A JPH02101226A (en) 1988-10-05 1988-10-05 Foundation construction at soft ground

Publications (1)

Publication Number Publication Date
JPH02101226A true JPH02101226A (en) 1990-04-13

Family

ID=17218552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25115988A Pending JPH02101226A (en) 1988-10-05 1988-10-05 Foundation construction at soft ground

Country Status (1)

Country Link
JP (1) JPH02101226A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59106628A (en) * 1982-12-10 1984-06-20 Yasuyuki Yamamoto Foundation work in soft ground containing sludge

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59106628A (en) * 1982-12-10 1984-06-20 Yasuyuki Yamamoto Foundation work in soft ground containing sludge

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