JPH1046566A - Ground reinforcing engineering method and hollow rectangular stirring apparatus used for it - Google Patents
Ground reinforcing engineering method and hollow rectangular stirring apparatus used for itInfo
- Publication number
- JPH1046566A JPH1046566A JP20810496A JP20810496A JPH1046566A JP H1046566 A JPH1046566 A JP H1046566A JP 20810496 A JP20810496 A JP 20810496A JP 20810496 A JP20810496 A JP 20810496A JP H1046566 A JPH1046566 A JP H1046566A
- Authority
- JP
- Japan
- Prior art keywords
- shafts
- stirring
- rectangular
- drilling
- excavation
- 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
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は地盤をほぼ矩形に掘
削し、土壌硬化剤を混ぜて固化させ、液状化防止や、埋
立て地における漏洩防止、地盤強化等を可能にする地盤
強化工法及びそれに用いる中抜矩形撹拌装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground reinforcement method for excavating a ground into a substantially rectangular shape, mixing a soil hardening agent and solidifying the ground, thereby preventing liquefaction, preventing leakage at a landfill site, strengthening the ground, and the like. The present invention relates to a hollow rectangular stirrer used for the same.
【０００２】[0002]
【従来の技術】オーガ等の掘削装置を用いて掘削し、地
盤強化を行う工法には、小規模のものでは鋼管杭をネジ
込んでゆく工法(例えば、特開昭51-94615号,特公平2-62
648号,特公平4-19080号,特公平31317号)や、孔掘りされ
た部分へコンクリートパイルを挿入しセメントミルク等
の土壌硬化剤で固定する方法(特開平1-235719号)や、円
形あるいは本発明で対象とするような矩形に地盤を掘削
し、解された土砂に土壌硬化剤等を混ぜて地盤内へ直接
固化層を形成する工法が実施されている。2. Description of the Related Art A method of excavating using an excavator such as an auger and strengthening the ground includes a method of screwing a steel pipe pile in small-scale ones (for example, Japanese Patent Laid-Open No. 51-94615, 2-62
648, Japanese Patent Publication No. 4-19080, Japanese Patent Publication No. 31317), a method of inserting a concrete pile into the dug portion and fixing it with a soil hardening agent such as cement milk (Japanese Patent Laid-Open No. 1-235719), Alternatively, a method has been practiced in which the ground is excavated into a rectangular shape as the object of the present invention, and a soil hardening agent or the like is mixed with the unraveled soil to directly form a solidified layer in the ground.
【０００３】[0003]
【発明が解決しようとする課題】通常の鋼管杭やコンク
リートパイルは他数本を用いてある程度距離を大きく打
ち込んだ状態にしようとすると円形断面であるから、杭
同士の接触部は円形同士の接触となって強度的に好まし
くない。また、鋼管杭やコンクリートパイルを地盤中へ
残す工法であるから無駄も多い。一方、従来の螺旋状の
掘削爪によって掘削を多数回繰返しながら所定の長さま
で掘削をし、その都度土壌硬化剤を注入して地盤を直接
固化させようとすると、掘削孔をオーバーラップさせる
必要のある掘削面積が大きく、非能率的な作業となる。
そこで、矩形に地盤を掘削し、解された土砂に土壌硬化
剤等を混ぜて地盤内へ直接固化層を形成する工法が効率
がよい。本発明はこの矩形掘削工法における撹拌混合度
合いを高めて、上部からの荷重に対するばかりでなく液
状化に対しても強固な固化層を地盤内へ形成することを
可能にしようとするものである。When a normal steel pipe pile or concrete pile is driven into a state where it is driven into a large distance to some extent by using several other piles, the pile has a circular cross section. It is not preferable in terms of strength. In addition, this method wastes steel pipe piles and concrete piles in the ground. On the other hand, when a conventional spiral excavation claw excavates repeatedly to a predetermined length while repeating the excavation many times, and in each case injecting a soil hardening agent to directly solidify the ground, it is necessary to overlap the excavation holes. Certain excavation area is large and inefficient work.
Therefore, a method of excavating the ground in a rectangular shape, mixing a soil hardening agent or the like with the unraveled earth and sand, and forming a solidified layer directly in the ground is efficient. An object of the present invention is to increase the degree of stirring and mixing in the rectangular excavation method so that a solidified layer that is strong not only against loads from above but also against liquefaction can be formed in the ground.
【０００４】[0004]
【課題を解決するための手段】本発明の地盤強化工法
は、複数の回転掘削爪により地盤を掘削し、解された土
砂に土壌硬化剤を注入撹拌して混合土砂を固化させる工
法において、複数軸(例えば３本や５本の軸の横並び)か
らなる矩形掘削部の中央軸へ隣接する撹拌手段方向へ混
合土砂を放出させる放出手段を設けて、中央の混合土砂
を掘削部の進行方向とは逆方向へ放出させて撹拌混合度
合いを高めることを特徴とする。ここにいう土壌硬化剤
は市販のものから土質に合ったものを任意に選択して用
いる。例えば、セメント系固化剤(セメントスラリー、
セメントミルクなど)、有機高分子系固化剤などであ
る。According to the present invention, there is provided a method for strengthening a ground, comprising excavating the ground with a plurality of rotary excavating claws, injecting and stirring a soil hardening agent into the unraveled earth and sand to solidify the mixed earth and sand. Discharge means for discharging mixed sediment in the direction of the stirring means adjacent to the central axis of the rectangular excavation part consisting of axes (for example, three or five axes arranged side by side) is provided. It is characterized by increasing the degree of stirring and mixing by discharging in the opposite direction. The soil hardening agent used here is arbitrarily selected from commercially available ones that match the soil properties. For example, cement-based solidifying agent (cement slurry,
Cement milk, etc.), and organic polymer-based solidifying agents.
【０００５】また、撹拌混合度合いを高めた掘削部へ遮
蔽板を埋設することを特徴とする地盤強化工法である。
ここにいう遮蔽板とは、鋼矢板とか強化プラスチツク
板、その他固化前の掘削部へ埋設することによって、水
その他の移動を困難にするものである。掘削部内外の遮
断を可能にする素材であれば特に形状を問わない。[0005] Further, there is provided a ground strengthening method characterized in that a shield plate is buried in an excavated portion having a high degree of stirring and mixing.
The shielding plate referred to here is a steel sheet pile, a reinforced plastic plate, or another material that is buried in an excavated portion before solidification to make it difficult to move water and the like. The material is not particularly limited as long as it can cut off the inside and outside of the excavated portion.
【０００６】これらの地盤強化工法に適した装置とし
て、中抜矩形撹拌装置、すなわち、複数の掘削爪を回転
可能とした掘削装置の掘削軸途中に設ける装置であっ
て、前記複数の掘削軸に連結される中央軸に放出手段と
してスクリューとその外周に案内筒を設け、前記中央軸
(スクリュー軸)の両隣の軸に対して該軸の鉛直軸回転方
向を水平軸回転方向へと変換して回転するカッタをそれ
ぞれ対で設けて略矩形掘削を可能にし、掘削爪及びカッ
タによる掘削とスクリューによる放出により撹拌混合を
可能にした装置を開発した。[0006] As an apparatus suitable for these ground strengthening methods, a hollow hollow stirrer, that is, an apparatus provided in the middle of an excavating shaft of a drilling device capable of rotating a plurality of excavating claws, is provided. A screw is provided on the central shaft to be connected as a discharging means and a guide cylinder is provided on the outer periphery thereof, and the central shaft is
(Screw shaft) The vertical axis rotation direction of this axis is converted into the horizontal axis rotation direction with respect to both adjacent axes to provide a pair of cutters that rotate and enable substantially rectangular excavation, and excavation with an excavation claw and a cutter And a device that enables stirring and mixing by discharging with a screw.
【０００７】この中抜矩形撹拌装置には、中央スクリュ
ー軸とその両隣の軸を結ぶ線が角度を有する、矩形とい
うよりはむしろ長辺の二辺が円弧となる略矩形掘削を可
能にしたものも含まれる。[0007] This rectangular hollow stirrer enables a substantially rectangular excavation in which a line connecting a central screw shaft and its two adjacent shafts has an angle, and two long sides are arcs rather than rectangles. Is also included.
【０００８】[0008]
【発明の実施の形態】図１は本発明の地盤強化工法を実
施する装置の例を示しており、重機１により起立された
支柱２に一般には、オーガと呼ばれている掘削装置３が
設けられており、その複数の掘削軸４の下端部へ掘削爪
５が設けられ、その上部へ本発明の中抜矩形撹拌装置６
を設けている。掘削軸４には更に案内羽根７と撹拌羽根
８を設けている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an apparatus for carrying out a method for strengthening a ground according to the present invention. A strut 2 erected by a heavy equipment 1 is provided with an excavator 3 generally called an auger. An excavating claw 5 is provided at the lower end of the plurality of excavating shafts 4, and the hollow rectangular stirrer 6 according to the present invention is provided above the excavating claw 5.
Is provided. The excavating shaft 4 is further provided with a guide blade 7 and a stirring blade 8.
【０００９】中抜矩形撹拌装置６の実施例を図２〜４に
示す。中抜矩形撹拌装置６は掘削装置の３本の掘削軸4a
〜4cに連結される軸9a〜9cが掘削軸4a〜4cの途中へ介在
する状態で取付られて用いられる。中央のスクリュー軸
9bに掘削土壌の上方への放出手段としてスクリュー10と
その外周に案内筒11を設けている。中央のスクリュー軸
9bの両隣の軸9a,9cは案内筒11へケーシング12が固着一
体化されており、図４に示すように、ケーシング12内に
は掘削軸４に接続されて回転する軸9aに設けられた水平
回転ベベルギヤ13と対で設けられた鋸歯状のカッタ14,1
4(矩形掘削を可能にするよう左右に２個づつ計４個)を
回転させる垂直回転軸15,15とそれに設けたべベルギヤ1
6,16がある。軸9a,9cの鉛直軸回転方向をカッタ14の水
平軸回転方向へと変換するための機構については、この
例のベベルギヤによる例以外にハイポイドギヤ、ウォー
ムとウォームホイールなど公知の機構を採用することが
できる。カッタを鋸歯状ディスクの複数枚で構成する
と、瀝層等の掘削が困難な地盤でも容易に切断しながら
掘削できる。FIGS. 2 to 4 show an embodiment of the hollow rectangular stirring device 6. The hollow rectangular stirrer 6 has three drilling shafts 4a of the drilling rig.
The shafts 9a to 9c connected to the excavating shafts 4a to 4c are attached and used in a state interposed in the middle of the excavating shafts 4a to 4c. Central screw shaft
9b is provided with a screw 10 as a means for discharging excavated soil upward and a guide cylinder 11 on the outer periphery thereof. Central screw shaft
The shafts 9a and 9c on both sides of 9b have a casing 12 fixedly integrated with the guide tube 11, and are provided on a rotating shaft 9a connected to the excavating shaft 4 in the casing 12, as shown in FIG. Saw-shaped cutters 14, 1 provided in pairs with the horizontal rotating bevel gear 13.
Vertical rotating shafts 15 and 15 for rotating 4 (two on each side to enable rectangular excavation) and bevel gears 1
There are 6,16. Regarding the mechanism for converting the vertical rotation direction of the shafts 9a and 9c to the horizontal rotation direction of the cutter 14, a known mechanism such as a hypoid gear, a worm and a worm wheel may be employed in addition to the example using the bevel gear in this example. it can. When the cutter is composed of a plurality of saw-toothed disks, it is possible to excavate easily even on the ground where excavation such as bitumen is difficult.
【００１０】この装置によって、掘削爪５及びカッタ1
4,14による矩形掘削とスクリューによる掘削部の進行方
向とは逆方向への放出により土砂の撹拌混合を完全に行
うことができる。掘削軸4a〜4cも軸9a〜9cもいずれも中
空となっており、中空部を土壌硬化剤が通過して先端の
掘削爪の付近で地盤中へ放出される。掘削部の進行方向
とは、掘削進行の場合の下降方向と、その逆の掘削を終
えて所定の位置まで行った後に掘削爪等の掘削部を取り
除くための上昇方向の両方向をいう。いずれの場合も矩
形掘削部の中央軸へ隣接する撹拌手段方向へ混合土砂を
放出させて撹拌混合を行うことができるので、更に撹拌
混合度合いを高めることができる。矩形掘削部のサイズ
だけ移動させながら掘削と固化を行ないながら固化領域
20を形成していく。With this device, the excavating claw 5 and the cutter 1
The rectangular excavation by 4 and 14 and the expulsion of the excavation part by the screw in the direction opposite to the traveling direction can completely mix and mix the earth and sand. Both the excavation shafts 4a to 4c and the shafts 9a to 9c are hollow, and the soil hardening agent passes through the hollow portion and is discharged into the ground near the excavation claw at the tip. The traveling direction of the excavation part refers to both a descending direction in the case of excavation progress and an ascending direction for removing the excavation part such as an excavation claw after the excavation is performed to a predetermined position after the excavation is completed. In any case, the mixed sediment can be discharged and stirred and mixed in the direction of the stirring means adjacent to the central axis of the rectangular excavation part, so that the degree of stirring and mixing can be further increased. Solidification area while excavating and solidifying while moving by the size of the rectangular excavation part
Form 20.
【００１１】図５〜図７は本発明の他の実施例であっ
て、矩形掘削を可能にするよう左右に４個づつ計８個の
カッタ14が設けられており、４個づつのカッタ14の間の
中央の軸9bに放出手段としてスクリュー10とその外周に
案内筒11を設けている。軸9a,9cの鉛直軸回転方向をカ
ッタ14,14の水平軸回転方向へと変換するために、軸9a
(9c)にウォーム17を設け、カッタの回転軸15にウォーム
ホイール18,18を設けている。この装置によると左右の
掘削軸の中央で撹拌しながら一度に長い矩形掘削が可能
で効率がよい。FIGS. 5 to 7 show another embodiment of the present invention, in which a total of eight cutters 14 are provided on each of the right and left sides so as to enable rectangular excavation. A screw 10 as a discharging means and a guide cylinder 11 on its outer periphery are provided on a central shaft 9b therebetween. In order to convert the vertical rotation direction of the shafts 9a and 9c to the horizontal rotation direction of the cutters 14 and 14, the shaft 9a
The worm 17 is provided in (9c), and the worm wheels 18 are provided on the rotating shaft 15 of the cutter. According to this device, a long rectangular excavation can be performed at a time while stirring at the center of the left and right excavation axes, which is efficient.
【００１２】図８は本発明の他の実施例である。矩形掘
削というよりはむしろ少し湾曲した掘削と地盤強化を可
能にする装置であって、中央のスクリュー軸とその両隣
の軸を結ぶ線が180°より小さい角度αを有する、すな
わち、矩形長辺ａ,ｂの二辺が円弧となる略矩形掘削を
可能にした装置である。これまでの例のように直線のみ
(α=180°)でなく湾曲あるいはほぼ直角(α=90°)の掘
削と固化領域20の形成による地盤強化が可能である。FIG. 8 shows another embodiment of the present invention. A device that allows a slightly curved excavation and ground reinforcement rather than a rectangular excavation, wherein the line connecting the central screw axis and its adjacent axes has an angle α of less than 180 °, that is, a rectangular long side a , b is a device that enables a substantially rectangular excavation in which two sides are arcs. Only a straight line as in the previous examples
It is possible to strengthen the ground by excavating not at (α = 180 °) but at a curved or almost right angle (α = 90 °) and forming the solidified region 20.
【００１３】図９は撹拌混合度合いを高めた掘削部へ遮
蔽板21を埋設して固化領域20の補強作用に加えて遮蔽作
用の強化を図っている。遮蔽板21はこの例では鋼矢板で
ある。これによって埋立て地における有害物質の漏洩等
を防ぐことができる。FIG. 9 shows that the shielding plate 21 is buried in the excavated portion where the degree of stirring and mixing is increased to strengthen the shielding effect in addition to the reinforcing effect of the solidified region 20. The shielding plate 21 is a steel sheet pile in this example. This can prevent harmful substances from leaking into the landfill.
【００１４】[0014]
【発明の効果】本発明によれば掘削中や掘削装置の収納
中においても土砂等の撹拌が行われるので、地盤中へ従
来より強固な強化層を効率よく施工することができる。
また、地盤の液状化防止、有害物質の漏洩防止を可能に
した。According to the present invention, the earth and the sand are agitated even during excavation and during storage of the excavator, so that a stronger reinforcing layer than before can be efficiently constructed in the ground.
It also made it possible to prevent liquefaction of the ground and leakage of harmful substances.
【図１】本発明の地盤強化工法に用いる装置例の側面図
である。FIG. 1 is a side view of an example of an apparatus used for a ground reinforcement method of the present invention.
【図２】中抜矩形撹拌装置の実施例正面図である。FIG. 2 is a front view of the embodiment of the hollow rectangular stirring device.
【図３】同中抜矩形撹拌装置の平面図である。FIG. 3 is a plan view of the rectangular hollow stirring device.
【図４】図３中Ａ−Ａ断面図である。FIG. 4 is a sectional view taken along the line AA in FIG. 3;
【図５】中抜矩形撹拌装置の他の実施例平面図である。FIG. 5 is a plan view of another embodiment of the hollow rectangular stirring device.
【図６】同中抜矩形撹拌装置の正面図である。FIG. 6 is a front view of the rectangular hollow stirring device.
【図７】図６中Ｂ−Ｂ断面図である。FIG. 7 is a sectional view taken along the line BB in FIG. 6;
【図８】中抜矩形撹拌装置の他の実施例平面図である。FIG. 8 is a plan view of another embodiment of the hollow rectangular stirring device.
【図９】掘削部へ遮蔽板を埋設している例の平面図であ
る。FIG. 9 is a plan view of an example in which a shielding plate is buried in an excavation part.
３ 掘削装置 ４ 掘削軸 ５ 掘削爪 ６ 中抜矩形撹拌装置 ７ 案内羽根 ８ 撹拌羽根 9a 軸 9b スクリュー軸 9c 軸 10 スクリュー 11 案内筒 14 カッタ 20 固化領域 21 遮蔽板 Reference Signs List 3 excavating device 4 excavating shaft 5 excavating claw 6 hollow rectangular stirring device 7 guide blade 8 stirring blade 9a shaft 9b screw shaft 9c shaft 10 screw 11 guide cylinder 14 cutter 20 solidification area 21 shielding plate
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【手続補正書】[Procedure amendment]
【提出日】平成９年１０月１日[Submission date] October 1, 1997
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Correction target item name] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【特許請求の範囲】[Claims]
Claims (4)
解された土砂に土壌硬化剤を注入撹拌して混合土砂を固
化させる工法において、複数軸からなる矩形掘削部の中
間軸へ隣接する撹拌手段方向へ混合土砂を放出させる放
出手段を設けて、中間部の混合土砂を掘削部の進行方向
とは逆方向へ放出させて撹拌混合度合いを高めることを
特徴とする地盤強化工法。1. Excavating the ground with a plurality of rotary excavating claws;
In the construction method of injecting and stirring the soil hardening agent into the unraveled soil and solidifying the mixed sediment, the discharging means for discharging the mixed sediment in the direction of the stirring means adjacent to the intermediate axis of the rectangular excavation part comprising a plurality of axes is provided, A soil strengthening method characterized by increasing the degree of agitation and mixing by discharging the mixed sediment in the part in the direction opposite to the traveling direction of the excavation part.
掘削部へ遮蔽板を埋設することを特徴とする地盤強化工
法。2. A method for reinforcing a ground, wherein a shielding plate is buried in an excavated part having a high degree of stirring and mixing according to claim 1.
の掘削軸途中に設ける装置であって、前記複数の掘削軸
に連結される中央軸に放出手段としてスクリューとその
外周に案内筒を設け、該中央軸の両隣の軸に対して該軸
の鉛直軸回転方向を水平軸回転方向へと変換して回転す
るカッタをそれぞれ対で設けて略矩形掘削を可能にし、
掘削爪及びカッタによる掘削とスクリューによる放出に
より撹拌混合を可能にした中抜矩形撹拌装置。3. A device provided in the middle of a digging shaft of a digging device in which a plurality of digging claws are rotatable, wherein a screw and a guide cylinder are provided on a central shaft connected to the plurality of digging shafts as a discharge means and an outer periphery thereof. Provided, a pair of cutters which rotate the vertical axis rotation direction of the axis to the horizontal axis rotation direction with respect to the axis adjacent to the center axis and provide the cutters in pairs, enabling substantially rectangular excavation,
A hollow rectangular stirrer that enables stirring and mixing by excavation with a drilling claw and cutter and discharge by a screw.
ぶ線が角度を有する請求項２記載の中抜矩形撹拌装置。4. A rectangular hollow stirrer according to claim 2, wherein a line connecting the central screw shaft and the adjacent shafts has an angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20810496A JP2908761B2 (en) | 1996-08-07 | 1996-08-07 | Ground strengthening method and hollow rectangular stirrer used for it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20810496A JP2908761B2 (en) | 1996-08-07 | 1996-08-07 | Ground strengthening method and hollow rectangular stirrer used for it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1046566A true JPH1046566A (en) | 1998-02-17 |
| JP2908761B2 JP2908761B2 (en) | 1999-06-21 |
Family
ID=16550709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20810496A Expired - Lifetime JP2908761B2 (en) | 1996-08-07 | 1996-08-07 | Ground strengthening method and hollow rectangular stirrer used for it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2908761B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677717A (en) * | 2012-06-01 | 2012-09-19 | 张永忠 | Double-power grooving machine |
-
1996
- 1996-08-07 JP JP20810496A patent/JP2908761B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677717A (en) * | 2012-06-01 | 2012-09-19 | 张永忠 | Double-power grooving machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2908761B2 (en) | 1999-06-21 |
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