JP2887578B2 - Soft sandy ground improvement method - Google Patents
Soft sandy ground improvement methodInfo
- Publication number
- JP2887578B2 JP2887578B2 JP9162596A JP9162596A JP2887578B2 JP 2887578 B2 JP2887578 B2 JP 2887578B2 JP 9162596 A JP9162596 A JP 9162596A JP 9162596 A JP9162596 A JP 9162596A JP 2887578 B2 JP2887578 B2 JP 2887578B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- ground
- soft sandy
- pile material
- improvement method
- 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
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、軟弱砂質土地盤の
改良工法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving soft sandy ground.
【０００２】[0002]
【従来の技術】従来の軟弱砂質土地盤改良工法の代表例
であるサンドコンパクション工法やグラベルドレーン工
法は、大量の砂や砕石を使用するものであるが、これら
工法用として好適な砂や砕石の確保が段々と難しくなっ
てきており、これが従来技術の大きな問題点になってい
る。2. Description of the Related Art The sand compaction method and the gravel drain method, which are typical examples of the conventional soft sandy ground improvement method, use a large amount of sand or crushed stone. Is becoming increasingly difficult, which is a major problem of the prior art.
【０００３】ところで、本発明者らは、最近、現場発生
土や産業廃棄物を材料とするパイルを造成して合理的か
つ経済的に軟弱粘性土地盤を改良する工法を開発した
が、パイル造成用中空管の地中貫入時に周辺地盤に作用
する力で周辺地盤に変化を与え、この状態を中空管の引
き抜き後もその跡にパイル材料を充填することで保持す
る、というこの工法の基本的な考え方が、軟弱砂質土地
盤を液状化しないように改良する場合にも適用できるこ
とが判った。Recently, the present inventors have developed a construction method for improving a soft and viscous ground by using a pile made of on-site generated soil or industrial waste to improve the soft and viscous ground. This method involves changing the surrounding ground with the force acting on the surrounding ground when the hollow tube penetrates into the ground, and maintaining this state after filling the hollow tube by filling the trace with pile material. It was found that the basic idea can be applied to the improvement of soft sandy ground without liquefaction.
【０００４】[0004]
【発明が解決しようとする課題】本発明が解決しようと
する課題、すなわち、本発明の目的は、前記知見に基づ
き、建設発生土や産業廃棄物を用いて軟弱砂質土地盤を
液状化しないように改良する新規構想の工法を提供する
ことにある。The problem to be solved by the present invention, that is, the object of the present invention is based on the above-mentioned findings, and does not liquefy soft sandy ground using construction-generated soil or industrial waste. It is to provide a method of a new concept to be improved as described above.
【０００５】[0005]
【課題を解決するための手段】前記課題を解決するため
に、本発明の第１の工法（請求項１記載の工法）では、
軟弱砂質土地盤中に中空管を貫入し、該中空管を引き抜
きつつ、その跡に細粒分含有率が１５％より大きい土を
充填してパイルを造成し、前記中空管の貫入時に周辺地
盤に作用する側方押し力で、周辺地盤をせん断変形させ
つつ圧縮してその密度を高め、この状態を中空管の引き
抜き後もその跡に充填したパイル材料で保持して、地盤
を液状化しないように改良する際に、パイル材料の土
が、細粒分含有率が５０％より大きい場合はそのまま用
い、細粒分含有率が１５％より大きく５０％より小さい
場合は液状化が起こらない程度のパイル芯強度が確保さ
れるように改善して用いるようにしている。Means for Solving the Problems In order to solve the above problems, the first method of the present invention (the method according to claim 1) includes:
The hollow pipe is penetrated into the soft sandy ground, the hollow pipe is pulled out, and the trace is filled with soil having a fine particle content of more than 15% to form a pile. With the lateral pushing force acting on the surrounding ground when penetrating, the surrounding ground is compressed while shearing and deforming to increase its density, and this state is retained by the pile material filled in the trace even after the hollow pipe is pulled out, When improving the ground so that it does not liquefy,
However, if the fine particle content is greater than 50%, use
Fine grain content is greater than 15% and less than 50%
Pile core strength enough to prevent liquefaction
So that it can be improved and used .
【０００６】本発明の第２の工法（請求項２記載の工
法）では、軟弱砂質土地盤中に貫入した中空管を引き抜
きつつ、その跡に粒状の産業廃棄物を充填してパイルを
造成し、前記中空管の貫入時に周辺地盤に作用する側方
押し力で、周辺地盤をせん断変形させつつ圧縮してその
密度を高め、この状態を中空管の引き抜き後もその跡に
充填したパイル材料で保持して、地盤を液状化しないよ
うに改良する際に、パイル材料の産業廃棄物が、粒径が
０．０１ｍｍ以下もしくは２．００ｍｍ以上の場合はそ
のまま用い、粒径が０．０１ｍｍより大きく２．００ｍ
ｍより小さい場合は液状化が起こらない程度のパイル芯
強度が確保されるように改善して用いるようにしてい
る。[0006] The second method of the present invention (the method of claim 2)
Method) , the hollow pipe penetrating into the soft sandy ground is pulled out, and at that point, granular industrial waste is filled to create a pile, and the pile acting on the surrounding ground when the hollow pipe penetrates With the pushing force, the surrounding ground is compressed while shearing and deforming to increase its density, and this state is maintained with the pile material filled in the trace even after the hollow tube is pulled out, so that the ground does not liquefy When the industrial waste of pile material is
If it is 0.01 mm or less or 2.00 mm or more,
Used as is, with a particle size greater than 0.01 mm and 2.00 m
If it is smaller than m, the pile core will not liquefy
It is improved so that the strength is secured .
【０００７】本発明の第３の工法（請求項３記載の工
法）では、前記第１と第２の工法において、パイル材料
の中空管への投入と中空管からの排出を容易にするため
に、パイル材料に予め、加水するかまたは脱水固化材を
配合するようにしている。[0007] The third method of the present invention ( the method of claim 3)
In Act), in the first and second method, in order to facilitate the discharge of the charged and hollow tube into the hollow tube of the pile material, in advance in the pile material, whether or dehydration solidifying material hydro I try to mix.
【０００８】本発明の第４の工法（請求項４記載の工
法）では、前記第１と第２の工法において、中空管から
の排出が容易にするために、パイル材料を袋詰めにして
いる。[0008] The fourth method of the present invention ( the method of claim 4)
In Act), in the first and second method, in order to facilitate the discharge of the hollow tube, and the pile material is bagged.
【０００９】本発明の第５の工法（請求項５記載の工
法）では、前記第４の工法において、不透水性の袋を用
いている。The fifth method of the present invention ( the method of claim 5)
Method) , an impermeable bag is used in the fourth method.
【００１０】[0010]
【発明の実施の形態】本発明の工法では、中空管の貫入
時や引き抜き時に中空管を振動もしくは回転させるか否
かとパイル自体を締め固めるか否かは、共に任意であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method of the present invention, it is optional whether to vibrate or rotate the hollow tube or to compact the pile itself when the hollow tube is penetrated or pulled out.
【００１１】 パイル材料の土としては、建設発生土を利
用するのが一般的であるが、その他、切り出し山土や現
地で掘削した土を用いても構わない。 As the soil of the pile material, construction-generated soil is generally used, but other than that, cut-out mountain soil or soil excavated on site may be used.
【００１２】 パイル材料として細粒分含有率が５０％よ
り大きい土を用いる場合は、パイル自体が液状化するこ
とはないので、パイルの強度を考える必要はなく、パイ
ル材料をそのまま使用する。 When soil having a fine particle content of more than 50% is used as the pile material, it is not necessary to consider the strength of the pile because the pile itself does not liquefy, and the pile material is used as it is .
【００１３】 パイル材料として細粒分含有率が１５％よ
り大きく５０％より小さい土を用いる場合は、パイル自
体が液状化する恐れがあるので、液状化が起こらない程
度のパイル芯強度（例えば、Ｎ値５〜１０程度）が確保
されるようにパイル材料を改善する必要があり、その改
善はパイル材料の土に所定量の固化材（石灰、セメント
等）を配合する等して行うことができる。 [0013] When soil having a fine particle content of more than 15% and less than 50% is used as the pile material, the pile itself may be liquefied. it is necessary to improve the pile material as about N value 5-10) is secured, a predetermined amount of the solidifying material to the soil of the improvement pile material (lime, be carried out by equally blended cement, etc.) it can.
【００１４】 パイル材料の産業廃棄物としては、例え
ば、汚泥や石炭灰が考えられるが、これに限定されず、
原則として有害でないものであれば良い。The [0014] industrial waste of pile material, for example, it is conceivable sludge and coal ash, is not limited to this,
In principle, any substance that is not harmful may be used.
【００１５】 パイル材料として粒径が０．０１ｍｍ以下
もしくは２．００ｍｍ以上の産業廃棄物を用いる場合
は、パイル自体が液状化する恐れがないので、パイルの
強度を考える必要はなく、パイル材料をそのまま使用す
ることができる。 When industrial waste having a particle size of 0.01 mm or less or 2.00 mm or more is used as the pile material, there is no possibility that the pile itself is liquefied. Can be used as is.
【００１６】 パイル材料として粒径が０．０１ｍｍより
大きく２．００ｍｍより小さい産業廃棄物を用いる場合
は、パイル自体が液状化する恐れがあるので、前述の土
の場合と同様に例えば固化材を配合してパイル材料を改
善するが、この場合、乾燥しているパイル材料に加水す
る前処理が必要である。 [0016] If the particle diameter as the pile material is used greater than 2.00mm less industrial waste 0.01mm, because the pile itself is likely to liquefy, similarly to the case for instance solidifying material above the soil The blending improves the pile material, but in this case a pretreatment is needed to add water to the dry pile material.
【００１７】 本発明の工法では、パイル材料の中空管へ
の投入と中空管からの排出を容易にするという施工上の
目的で、パイル材料に予め、加水するか（パイル材料が
乾燥している場合）または少量の脱水固化材（石灰かセ
メント）を配合するのが好ましいが、前述のように強度
確保のために固化材を配合する場合は、その固化材が施
工性の改善にも役立つことは勿論である。 In the method of the present invention, water is added to the pile material in advance (for example, when the pile material is dried and dried) in order to facilitate the charging and discharging of the pile material into and from the hollow tube. ) Or a small amount of dewatered and solidified material (lime or cement) is preferred, but if a solidified material is added to ensure strength as described above, the solidified material will also improve workability. Of course it is useful.
【００１８】 また、本発明の工法では、パイル材料の中
空管への投入を容易にするために、パイル材料を袋詰め
するのが好ましいが、この際、不透水性性の袋を用いる
と、有害か無害かがはっきりしない産業廃棄物でも安心
してパイル材料として使用できる利点がある。 In the method of the present invention, it is preferable to pack the pile material in a bag in order to make it easier to put the pile material into the hollow tube. In addition, there is an advantage that even industrial waste, which is not clear whether it is harmful or harmless, can be safely used as a pile material.
【００１９】 なお、本発明の工法は、原則として、従来
のサンドドレーン工法用やサンドコンパクション工法用
の装置を使用して実施することができるが、パイル材料
の性状が異なることから、ホッパの傾斜等で若干の改変
が必要である。 [0019] Incidentally, method of the present invention, in principle, can be carried out using conventional equipment for the sand drain method for and sand compaction method, since the nature of the pile material is different, the inclination of the hopper Some modification is required for the above.
【００２０】[0020]
【発明の効果】本発明の工法は、以上のようなものであ
るから、処分に苦しむ建設発生土や産業廃棄物を有効利
用して経済的に軟弱砂質土地盤を改良し、その液状化を
確実に防止することができる。 The method of the present invention is as described above.
Therefore , it is possible to economically improve the soft sandy ground by effectively utilizing construction-generated soil and industrial waste suffering from disposal, and reliably prevent liquefaction thereof .
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−233521（ＪＰ，Ａ) 特開 平８−41852（ＪＰ，Ａ) 特開 昭50−19217（ＪＰ，Ａ) 特開 昭62−211420（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 3/10 104 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-233521 (JP, A) JP-A-8-41852 (JP, A) JP-A-50-19217 (JP, A) JP-A-62 211420 (JP, A) (58) Field surveyed (Int. Cl. 6 , DB name) E02D 3/10 104
Claims (5)
中空管を引き抜きつつ、その跡に細粒分含有率が１５％
より大きい土を充填してパイルを造成し、前記中空管の
貫入時に周辺地盤に作用する側方押し力で、周辺地盤を
せん断変形させつつ圧縮してその密度を高め、この状態
を中空管の引き抜き後もその跡に充填したパイル材料で
保持して、地盤を液状化しないように改良する際に、パ
イル材料の土が、細粒分含有率が５０％より大きい場合
はそのまま用い、細粒分含有率が１５％より大きく５０
％より小さい場合は液状化が起こらない程度のパイル芯
強度が確保されるように改善して用いることを特徴とす
る軟弱砂質土地盤改良工法。1. A hollow pipe penetrates into a soft sandy ground, and while the hollow pipe is pulled out, a fine particle content of 15%
A pile is created by filling larger soil, and the surrounding ground is sheared and deformed to increase its density while being sheared by the lateral pushing force acting on the surrounding ground when the hollow pipe penetrates. When the pipe is pulled out, it is retained with the pile material filled in the trace, and when improving the ground so that it does not liquefy,
When the soil of the il material has a fine particle content of more than 50%
Is used as it is, and the fine particle content is more than 15% and 50
% Is less than the pile core that does not cause liquefaction.
A soft sandy ground improvement method characterized in that it is used after being improved so as to ensure strength .
中空管を引き抜きつつ、その跡に土類似の産業廃棄物を
充填してパイルを造成し、前記中空管の貫入時に周辺地
盤に作用する側方押し力で、周辺地盤をせん断変形させ
つつ圧縮してその密度を高め、この状態を中空管の引き
抜き後もその跡に充填したパイル材料で保持して、地盤
を液状化しないように改良する際に、パイル材料の産業
廃棄物が、粒径が０．０１ｍｍ以下もしくは２．００ｍ
ｍ以上の場合はそのまま用い、粒径が０．０１ｍｍより
大きく２．００ｍｍより小さい場合は液状化が起こらな
い程度のパイル芯強度が確保されるように改善して用い
ることを特徴とする軟弱砂質土地盤改良工法。2. A pile is formed by penetrating a hollow tube into a soft sandy ground, extracting the hollow tube, filling the trace with an industrial waste similar to soil, and forming a pile. By the lateral pushing force acting on the surrounding ground at the time of penetration, the surrounding ground is compressed while shearing and deforming to increase its density, and this state is retained by the pile material filled in its trace even after the hollow pipe is pulled out, When improving the ground so that it does not liquefy , the pile material industry
Waste is less than 0.01mm or 2.00m in particle size
m is used as it is, and the particle size is from 0.01 mm.
Liquefaction does not occur if it is large and smaller than 2.00 mm
Used to improve pile core strength
Soft sandy land board improvement method, characterized in that that.
らの排出を容易にするために、パイル材料に予め、加水
するかまたは脱水固化材を配合する請求項１または請求
項２記載の軟弱砂質土地盤改良工法。 3. The pile material is preliminarily mixed with a water-soluble or dewatered solidification material in order to facilitate the introduction and discharge of the pile material into and from the hollow tube. The soft sandy ground improvement method described.
するために、パイル材料を袋詰めにする請求項１または
請求項２記載の軟弱砂質土地盤改良工法。 4. The soft sandy ground improvement method according to claim 1, wherein the pile material is packed in a bag to facilitate discharge of the pile material from the hollow tube.
弱砂質土地盤改良工法。 5. The method of improving soft sandy ground according to claim 4, wherein an impermeable bag is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9162596A JP2887578B2 (en) | 1996-03-11 | 1996-03-11 | Soft sandy ground improvement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9162596A JP2887578B2 (en) | 1996-03-11 | 1996-03-11 | Soft sandy ground improvement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09242061A JPH09242061A (en) | 1997-09-16 |
| JP2887578B2 true JP2887578B2 (en) | 1999-04-26 |
Family
ID=14031749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9162596A Expired - Fee Related JP2887578B2 (en) | 1996-03-11 | 1996-03-11 | Soft sandy ground improvement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2887578B2 (en) |
-
1996
- 1996-03-11 JP JP9162596A patent/JP2887578B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09242061A (en) | 1997-09-16 |
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