JPH05132923A - Improving method for soft ground - Google Patents

Improving method for soft ground

Info

Publication number
JPH05132923A
JPH05132923A JP30002191A JP30002191A JPH05132923A JP H05132923 A JPH05132923 A JP H05132923A JP 30002191 A JP30002191 A JP 30002191A JP 30002191 A JP30002191 A JP 30002191A JP H05132923 A JPH05132923 A JP H05132923A
Authority
JP
Japan
Prior art keywords
ground
sheet pile
pile wall
steel sheet
wall
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.)
Granted
Application number
JP30002191A
Other languages
Japanese (ja)
Other versions
JP2730705B2 (en
Inventor
Tasaku Mizutani
太作 水谷
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel 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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP30002191A priority Critical patent/JP2730705B2/en
Publication of JPH05132923A publication Critical patent/JPH05132923A/en
Application granted granted Critical
Publication of JP2730705B2 publication Critical patent/JP2730705B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To enable an improving effect to exhibited all over subject ground by a method in which soft ground is economically improved without raising the improving rate of the ground. CONSTITUTION:In an improving work for soft ground 1 where a building is to be constructed, the subject ground 1a is surrounded by a steel sheet pile wall 3 of a closed cross section, which is set to the bearing stratum 4. The inside ground layer is then improved by sand-compaction piles 8 and the upper part of the steel sheet piles is pulled inwards by a pressing means such as jack to give a prestress to the inside ground layer.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、埋め立て地等の軟弱地
盤上に建造物等を構築するための地盤改良および耐震補
強工法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement and seismic reinforcement construction method for constructing a building on soft ground such as a landfill.

【0002】[0002]

【従来の技術】埋め立て地等の軟弱地盤にあっては、経
時沈下や地震時の液状化現象等を回避するため、建造物
を構築する部分について地盤の改良を行うのが通常であ
る。改良工法としては、浚渫、掘削等による置換法、ド
レーン工法に代表される脱水法、混合処理工法などの化
学的あるいは物理的な固結法、サンドコンパクションパ
イル工法やバイブロフローテーション工法などの締め固
め法などが実用化されているが、これらはいずれも建造
物の真下のみならず、周辺領域を含めた広範囲にわたっ
て改良工事を施さないと地盤の塑性流動などにより充分
な改良効果をあげることが出来ない。同様に地盤自体の
強度を物理的に高めることを主眼とするため、充分な改
良効果を得るには地盤改良率(改良面積比率あるいは改
良体積比率)を大きくとることが必要であり、施工費用
が膨大なものになるという問題点がある。
2. Description of the Related Art In the case of soft ground such as landfill, it is usual to improve the ground in the portion where the building is constructed in order to avoid the subsidence and the liquefaction phenomenon during an earthquake. As the improved construction methods, replacement method by dredging, excavation, etc., dehydration method typified by drain method, chemical or physical consolidation method such as mixing treatment method, compaction method such as sand compaction pile method or vibroflotation method Although the methods have been put into practical use, all of them can show sufficient improvement effects due to plastic flow of the ground, etc. unless the improvement work is done not only directly under the building but also in a wide area including the surrounding area. Absent. Similarly, since the main purpose is to physically increase the strength of the ground itself, it is necessary to take a large ground improvement rate (improved area ratio or improved volume ratio) to obtain a sufficient improvement effect, and the construction cost There is a problem that it becomes enormous.

【0003】一方、上記のような地盤自体を物理的ある
いは化学的に改良する工法以外に、地盤中に杭状体ある
いは壁状体を築造することによって耐震性を高めること
も研究されている。特開平2-311613号公報によれば、砂
地盤中にセメント系固化材を混合攪拌して原地盤土を原
位置で化学的に固結する液状化防止工法(地盤改良工
法) において、改良しようとする地盤の周囲に、その地
盤を囲んで壁状の固結体を築造することが提案されてい
る。この方法の一例を図4に示す。1は砂地盤(軟弱地
盤)、2は建造物、3は固結体(壁状体)、4は粘性土
地盤(支持層)で、1aは砂地盤の改良対象範囲である。
On the other hand, in addition to the method of physically or chemically improving the ground itself as described above, it has also been studied to increase the earthquake resistance by constructing a pile-shaped body or a wall-shaped body in the ground. According to Japanese Patent Laid-Open No. 2-311613, let's improve in a liquefaction prevention method (ground improvement method) in which cement-based solidifying material is mixed and stirred in sand ground to chemically solidify the ground soil in situ. It has been proposed to construct a wall-shaped solid body around the ground, which surrounds the ground. An example of this method is shown in FIG. 1 is a sand ground (soft ground), 2 is a building, 3 is a solid body (wall-like body), 4 is a viscous ground bed (support layer), and 1a is an improvement target range of the sand ground.

【0004】このように、対象とする地盤を囲むように
壁状体3を築造したので、壁状体内側の地盤の剪断変形
を抑制することができ、地盤改良範囲を壁状体内部のみ
にとどめることができる。また、特開平3-103534号公報
によれば、構築する建造物を囲む地盤中に、下部を支持
層に根入れした地中壁を築造し、この地中壁上部と建造
物を一体的に結合することが提案されている。この方法
の一例を図5に示す。1は軟弱地層、2は建造物、3は
地中壁(壁状体)、4は支持層、5は基礎杭である。こ
こでの壁状体3は鋼管矢板で形成される。この工法にお
いても、壁状体3の存在により、地層は建造物の内外で
分断、隔離されることにより、外側の地盤の地震時にお
ける剪断歪みならびに過剰間隙水圧の地中壁内側地盤へ
の影響が抑制される。
Since the wall-shaped body 3 is constructed so as to surround the target ground in this manner, the shear deformation of the ground inside the wall-shaped body can be suppressed, and the ground improvement range is limited to the inside of the wall-shaped body. You can stay. Further, according to Japanese Patent Laid-Open No. 3-103534, in the ground surrounding the building to be built, an underground wall having a lower part embedded in a support layer is built, and the upper part of the underground wall and the building are integrated. Proposed to combine. An example of this method is shown in FIG. 1 is a soft ground layer, 2 is a building, 3 is an underground wall (wall-like body), 4 is a support layer, and 5 is a foundation pile. The wall-shaped body 3 here is formed of a steel pipe sheet pile. In this method as well, the existence of the wall-like body 3 divides and isolates the stratum inside and outside the building, so that the shear strain at the time of the earthquake on the outside ground and the effect of excess pore water pressure on the ground inside the underground wall Is suppressed.

【0005】[0005]

【解決しようとする課題】ところで、特開平2-311613号
公報や特開平3-103534号公報記載の方法によれば、壁状
体の近傍では地盤変形の抑止効果が発揮されることが予
想されるものの、壁状体から離れるに従い効果が弱まる
おそれがあり、必要な地盤改良域に対してかなり密に壁
状体を配置せねばならない。
By the way, according to the methods described in Japanese Patent Application Laid-Open No. 2-311613 and Japanese Patent Application Laid-Open No. 3-103534, it is expected that the effect of suppressing the ground deformation will be exhibited in the vicinity of the wall-shaped body. However, the effect may be weakened as the distance from the wall-like body is reduced, and the wall-like body should be arranged quite densely with respect to the required ground improvement area.

【0006】本発明は、簡単な操作を付加することによ
り、壁状体内全域に地盤改良効果を発揮する工法を提供
することを目的とする。
It is an object of the present invention to provide a method for exerting a ground improvement effect on the entire wall-shaped body by adding a simple operation.

【0007】[0007]

【課題を解決するための手段】本発明は、軟弱地盤上に
建造物を構築する場合に行う地盤改良工法であって、地
盤の改良対象範囲を支持層まで根入れさせた閉鎖断面の
鋼製矢板壁で囲いこみ、この鋼製矢板壁で囲まれた内部
の地層を任意の方法で地盤改良したのち、前記鋼製矢板
壁上部を内側に引き寄せることにより前記の鋼製矢板壁
で囲まれた内部の地層にプレストレスを与えることを特
徴とする。
SUMMARY OF THE INVENTION The present invention is a ground improvement method for constructing a structure on soft ground, which is made of steel having a closed cross section in which the range to be improved in the ground is rooted in the support layer. Enclosed with a sheet pile wall, after improving the ground in the inner formation surrounded by this steel sheet pile wall by any method, it was surrounded by the steel sheet pile wall by pulling the steel sheet pile wall upper part inward It is characterized by prestressing the inner strata.

【0008】[0008]

【作 用】一般に体積変化や締め固め効果を利用した工
法により地盤改良すると、地盤は水平方向に膨張しよう
とし、水平変位により密度増大や締め固め効果は減殺さ
れてしまうが、壁状体で囲まれた内部においてはこの膨
張が拘束されているため、水平方向の変位による損失が
防止される。本発明によれば、壁状体を鋼製矢板壁と
し、この鋼製矢板壁による拘束状態で地盤改良を行い、
その後にさらに鋼製矢板壁を内側に引き寄せることによ
り鋼製矢板壁で囲まれた内部の地層にプレストレスを与
えるので、地盤改良効果が一層助長され、地震等による
液状化現象や地盤沈下等をほぼ完全に防止することがで
きる。また、矢板壁で囲まれた地層が液状化などの軟化
を示した場合には、矢板壁に導入された弾性力と地盤圧
の均衡がくずれることから、矢板壁は地盤を締め付ける
方向に変形する。これにより、地盤の軟化を抑制すると
ともに沈下や塑性流動などを低減することができる。
[Operation] Generally, when the ground is improved by a method that utilizes the volume change and the compaction effect, the ground tends to expand in the horizontal direction, and the horizontal displacement diminishes the density increase and the compaction effect, but is surrounded by a wall-shaped body. Since the expansion is restrained in the inside of the hollow, the loss due to the horizontal displacement is prevented. According to the present invention, the wall-shaped body is a steel sheet pile wall, and the ground is improved in a restrained state by the steel sheet pile wall,
After that, by further pulling the steel sheet pile wall inward, prestressing is applied to the inner strata surrounded by the steel sheet pile wall, so that the ground improvement effect is further promoted, and liquefaction phenomenon and ground subsidence due to earthquakes etc. It can be prevented almost completely. Also, when the formation surrounded by the sheet pile wall shows softening such as liquefaction, the balance between the elastic force and the ground pressure introduced into the sheet pile wall collapses, so the sheet pile wall deforms in the direction of tightening the ground. .. As a result, it is possible to suppress the softening of the ground and reduce the subsidence and the plastic flow.

【0009】[0009]

【実施例】【Example】

実施例1 本発明の第1の実施例を図1により説明する。まず
(a)のごとく、建造物を構築する等の必要により、改
良しようとする軟弱地盤1の改良対象範囲1aを円形、矩
形等の閉鎖断面で囲んで鋼製の矢板壁3を打設する。矢
板の先端は支持力のある固い地層、すなわち支持層4に
充分根入れさせる。つぎに(b)のように、ジャッキ6
等の押圧手段により矢板壁3を弾性範囲内で外側に押し
広げる。この状態のまま、(c)のように矢板壁3で囲
まれた内側の軟弱地層内にサンドコンパクションパイル
8を造成する等の任意の手段によって地盤改良を行い、
完了後(d)のごとく、さきのジャッキ6を開放するこ
とにより、矢板壁3はその本来の弾性により内側に復元
し、内部の地層を締付けるので、矢板壁3内部全域にわ
たってプレストレスが与えられた状態となり、地盤の剛
性低下を抑制し、あるいは地盤の沈下を低減するなど、
地盤改良効果を助長する。
First Embodiment A first embodiment of the present invention will be described with reference to FIG. First, as shown in (a), a steel sheet pile wall 3 is placed by enclosing the improvement target range 1a of the soft ground 1 to be improved with a closed cross section such as a circle or a rectangle as necessary for constructing a building. .. The tip of the sheet pile is sufficiently rooted in a solid formation having supportive force, that is, the support layer 4. Next, as shown in (b), jack 6
The sheet pile wall 3 is pushed outward in the elastic range by a pressing means such as. In this state, as shown in (c), the ground is improved by any means such as forming the sand compaction pile 8 in the inner soft ground surrounded by the sheet pile wall 3,
After the completion, as shown in (d), by opening the jack 6 as described above, the sheet pile wall 3 is restored to the inside by its original elasticity and the inner strata is tightened, so that the prestress is given to the entire inside of the sheet pile wall 3. It becomes a state that suppresses the deterioration of the rigidity of the ground or reduces the subsidence of the ground.
Promote ground improvement effect.

【0010】実施例2 図2は本発明の第2の実施例を示す。(a)のごとく改
良しようとする軟弱地盤1の改良対象範囲1aを囲んで鋼
製の矢板壁3を構築することは、第1の実施例と同様で
ある。つぎに(b)のように対向する辺を結んで矢板壁
3の上部にタイロッド7を取り付ける。つづいて(c)
のように矢板壁3で囲まれた内側の軟弱地層にサンドコ
ンパクションパイル8を造成する等の任意の手段によっ
て地盤改良を行い、完了後、(d)のごとくさきに取り
付けたタイロッド7を締付ける。矢板壁3は内側に変形
して内部の地層を締め付けるので、矢板壁3内部全域に
わたってプレストレスが与えられた状態となり、地盤の
剛性低下を抑制し、あるいは地盤の沈下を低減するな
ど、地盤改良効果を助長する。図3は図2の(c)ある
いは(d)状態の平面図である。
Embodiment 2 FIG. 2 shows a second embodiment of the present invention. As in the case of (a), constructing the steel sheet pile wall 3 surrounding the improvement target range 1a of the soft ground 1 to be improved is similar to the first embodiment. Next, as shown in (b), the tie rods 7 are attached to the upper part of the sheet pile wall 3 by connecting the opposite sides. Continued (c)
As described above, the ground is improved by any means such as forming a sand compaction pile 8 in the inner soft ground surrounded by the sheet pile wall 3, and after the completion, the tie rod 7 attached to the blade as shown in (d) is tightened. Since the sheet pile wall 3 is deformed inward and tightens the inner formation, prestressing is applied to the entire interior of the sheet pile wall 3, suppressing deterioration of the rigidity of the ground or reducing the subsidence of the ground. Promote the effect. FIG. 3 is a plan view of the state (c) or (d) of FIG.

【0011】本実施例においてタイロッド7を取り付け
るタイミングは、この例に限らず、地盤改良と並行して
行ってもよいし、地盤改良後でもよい。さきの第1の実
施例と比較すると、本実施例では内部の地層の締め付け
をジャッキの開放ではなくタイロッドの締付けによって
行うので、締付け力を任意に制御でき、経過を観察しな
がら長期間にわたってフォローできるなどの利点があ
る。また、タイロッドに代えてワイヤロープとチェンブ
ロックの組み合わせなど、他の引き寄せ手段を使用して
もよい。
In the present embodiment, the timing of attaching the tie rods 7 is not limited to this example, and may be performed in parallel with the ground improvement or after the ground improvement. Compared with the first embodiment described above, in this embodiment, the internal formation is tightened by tightening the tie rods instead of opening the jack, so that the tightening force can be controlled arbitrarily and the follow-up can be performed for a long time while observing the progress. There are advantages such as being able to. Further, other pulling means such as a combination of a wire rope and a chain block may be used instead of the tie rod.

【0012】以上の説明で明らかなように、本発明にお
いては矢板の弾性変形を利用するので、使用する矢板は
鋼製のものであることは必要であるが、通常のU形矢
板、直線形矢板、鋼管矢板など、その種類は特に限定し
ない。また矢板壁の平面形状は一般には円形、矩形等の
閉鎖断面であるが、構築する建造物が埋設パイプライン
等の直線状をなしている場合には、対向する平行線状に
矢板壁を構築して本発明が実施できることは、いうまで
もない。
As is clear from the above description, since elastic deformation of the sheet pile is utilized in the present invention, it is necessary that the sheet pile to be used is made of steel. The type of sheet pile, steel pipe sheet pile, etc. is not particularly limited. In addition, the plane shape of the sheet pile wall is generally a closed cross section such as a circle or a rectangle, but when the building to be constructed has a straight line shape such as an embedded pipeline, the sheet pile wall is constructed in parallel parallel lines. Needless to say, the present invention can be carried out.

【0013】地盤改良手段も前記した公知のいずれの工
法でもよい。
The ground improvement means may be any of the known construction methods described above.

【0014】[0014]

【発明の効果】本発明によれば、単に閉鎖断面の矢板壁
内部を地盤改良する場合と比較して、地盤改良後にプレ
ストレスを導入しているので、地盤改良効果が矢板壁内
部全域に及んで助長され、逆にその分だけ地盤改良率を
低く設定することができるので、工事費用の節減が可能
となるという、経済的にもすぐれた効果がある。また、
内部地盤が液状化などの軟化を示した場合には、矢板壁
が地盤を締め付ける方向に変形するため、地盤の軟化や
沈下、塑性変動等を抑制することができる。
According to the present invention, prestress is introduced after the ground improvement, as compared with the case where the inside of the sheet pile wall having a closed cross section is simply improved. Therefore, the ground improvement effect extends to the entire inside of the sheet pile wall. Therefore, since the ground improvement rate can be set lower by that amount, the construction cost can be reduced, which is an economically excellent effect. Also,
When the internal ground shows softening such as liquefaction, the sheet pile wall is deformed in the direction of tightening the ground, so that softening or subsidence of the ground, plastic fluctuation, etc. can be suppressed.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1実施例の工事手順を示す概念図で
ある。
FIG. 1 is a conceptual diagram showing a construction procedure of a first embodiment of the present invention.

【図2】本発明の第2実施例の工事手順を示す概念図で
ある。
FIG. 2 is a conceptual diagram showing a construction procedure of a second embodiment of the present invention.

【図3】本発明の第2実施例を示す平面図である。FIG. 3 is a plan view showing a second embodiment of the present invention.

【図4】従来の技術を示す概念図である。FIG. 4 is a conceptual diagram showing a conventional technique.

【図5】他の従来の技術を示す概念図である。FIG. 5 is a conceptual diagram showing another conventional technique.

【符号の説明】[Explanation of symbols]

1 軟弱地盤 1a 改良対象範囲 2 建造物 3 壁状体 4 支持層 6 ジャッキ 7 タイロッド 8 サンドコンパクションパイル 1 Soft ground 1a Area to be improved 2 Buildings 3 Walls 4 Support layers 6 Jacks 7 Tie rods 8 Sand compaction piles

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 軟弱地盤上に建造物等を構築する場合に
行う地盤改良工法であって、地盤の改良対象範囲を支持
層まで根入れさせた閉鎖断面の鋼製矢板壁で囲いこみ、
この鋼製矢板壁で囲まれた内部の地層を任意の方法で地
盤改良したのち、前記鋼製矢板壁上部を内側に引き寄せ
ることにより前記の鋼製矢板壁で囲まれた内部の地層に
プレストレスを与えることを特徴とする軟弱地盤の改良
工法。
1. A ground improvement method carried out when constructing a building or the like on soft ground, which is surrounded by a steel sheet pile wall having a closed cross section in which the target area of ground improvement is rooted in a support layer,
After improving the ground of the inner formation surrounded by the steel sheet pile wall by an arbitrary method, prestressing the inner formation surrounded by the steel sheet pile wall by pulling the upper part of the steel sheet pile wall inward. An improved construction method for soft ground, which is characterized by giving
【請求項2】 鋼製矢板壁上部を内側に引き寄せる手段
が、打設後の矢板壁をジャッキ等の押圧手段によって外
方に押しひろげ、しかる後に内部の地層を地盤改良し、
その後に前記押圧手段を開放することによるものである
請求項1記載の軟弱地盤の改良工法。
2. The means for pulling the upper part of the steel sheet pile wall inward pushes the sheet pile wall after driving outward by a pressing means such as a jack, and thereafter improves the ground in the inner layer,
The method for improving soft ground according to claim 1, wherein the pressing means is subsequently opened.
【請求項3】 鋼製矢板壁上部を内側に引き寄せる手段
が、対向する辺を結んで矢板壁上部に取り付けたタイロ
ッド等である請求項1記載の軟弱地盤の改良工法。
3. The method for improving soft ground according to claim 1, wherein the means for pulling the upper part of the steel sheet pile wall inward is a tie rod or the like attached to the upper part of the sheet pile wall by connecting opposite sides.
JP30002191A 1991-11-15 1991-11-15 Improvement method for soft ground Expired - Fee Related JP2730705B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30002191A JP2730705B2 (en) 1991-11-15 1991-11-15 Improvement method for soft ground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30002191A JP2730705B2 (en) 1991-11-15 1991-11-15 Improvement method for soft ground

Publications (2)

Publication Number Publication Date
JPH05132923A true JPH05132923A (en) 1993-05-28
JP2730705B2 JP2730705B2 (en) 1998-03-25

Family

ID=17879757

Family Applications (1)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011162964A (en) * 2010-02-05 2011-08-25 Ohbayashi Corp Structure and construction method for reinforcing ground
JP2012180705A (en) * 2011-03-02 2012-09-20 Penta Ocean Construction Co Ltd Ground improvement method and rod-like body assembly
JP2012180706A (en) * 2011-03-02 2012-09-20 Penta Ocean Construction Co Ltd Ground improvement method and rod-like body assembly
JP2013221347A (en) * 2012-04-18 2013-10-28 Nishimatsu Constr Co Ltd Ground structure and ground improvement method
JP2013224529A (en) * 2012-04-20 2013-10-31 Kajima Corp Structure and method for reinforcing pile foundation
JP2013238034A (en) * 2012-05-15 2013-11-28 Nishimatsu Constr Co Ltd Soil structure and soil improvement method
JP2018031134A (en) * 2016-08-23 2018-03-01 公益財団法人鉄道総合技術研究所 Composite type liquefaction ground improvement method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011162964A (en) * 2010-02-05 2011-08-25 Ohbayashi Corp Structure and construction method for reinforcing ground
JP2012180705A (en) * 2011-03-02 2012-09-20 Penta Ocean Construction Co Ltd Ground improvement method and rod-like body assembly
JP2012180706A (en) * 2011-03-02 2012-09-20 Penta Ocean Construction Co Ltd Ground improvement method and rod-like body assembly
JP2013221347A (en) * 2012-04-18 2013-10-28 Nishimatsu Constr Co Ltd Ground structure and ground improvement method
JP2013224529A (en) * 2012-04-20 2013-10-31 Kajima Corp Structure and method for reinforcing pile foundation
JP2013238034A (en) * 2012-05-15 2013-11-28 Nishimatsu Constr Co Ltd Soil structure and soil improvement method
JP2018031134A (en) * 2016-08-23 2018-03-01 公益財団法人鉄道総合技術研究所 Composite type liquefaction ground improvement method

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