JPH08338017A - Excavation agitating device for large bore - Google Patents
Excavation agitating device for large boreInfo
- Publication number
- JPH08338017A JPH08338017A JP14453595A JP14453595A JPH08338017A JP H08338017 A JPH08338017 A JP H08338017A JP 14453595 A JP14453595 A JP 14453595A JP 14453595 A JP14453595 A JP 14453595A JP H08338017 A JPH08338017 A JP H08338017A
- Authority
- JP
- Japan
- Prior art keywords
- discharge port
- excavation
- excavating
- discharge
- blade
- 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]
【産業上の利用分野】この発明は、地盤の現位置掘削土
に固化材を添加して機械的に混合攪拌し、化学的に固化
した改良土柱を築造する地盤改良工法において、改良径
が例えば１．５ｍを超えるような大口径の改良土柱の築
造に適用する大口径用掘削攪拌装置に関するものであ
る。BACKGROUND OF THE INVENTION The present invention relates to a ground improvement method in which a solidifying material is added to the excavated soil at the current position of the ground and mechanically mixed and stirred to construct an improved soil column that has been chemically solidified. For example, the present invention relates to a large-diameter excavating and stirring apparatus applied to the construction of an improved soil pillar having a large diameter exceeding 1.5 m.
【０００２】[0002]
【従来の技術】深層混合地盤改良工法においては、一般
に、ベースマシンに掘削軸を回転掘進可能に設け、この
掘削軸の先端に掘削翼，攪拌翼，固化材吐出口などを設
けた掘削攪拌装置を使用し、例えば掘削軸を回転掘進さ
せて所定の深度に達すると、スラリー状の固化材を吐出
しつつ掘進・混合攪拌を行い、最下端まで達すると、掘
削軸を逆転させて引き上げながら再び混合攪拌し、地盤
中に改良土柱を築造している。2. Description of the Related Art In a deep mixed ground improvement method, generally, an excavating shaft is provided on a base machine so that the excavating shaft can be rotationally excavated, and an excavating blade, a stirring blade, a solidifying material discharge port, etc. are provided at the tip of the excavating shaft. For example, when the excavation shaft is rotationally excavated and reaches a predetermined depth, the excavation / mixing stirring is performed while discharging the solidified material in the form of slurry, and when the bottom end is reached, the excavation shaft is reversed and pulled up again. Mix and stir to build an improved soil pillar in the ground.
【０００３】このような掘削攪拌装置において、大口径
の改良土柱を築造する場合、掘削翼や攪拌翼に関して
は、その長さを単純に大きくすることで対応することが
できる。一方、固化材スラリーの吐出に関しては、改良
径が１．２ｍ〜１．５ｍ程度までであれば、セメントミ
ルク等の固化材スラリーを掘削軸の先端部における側面
に設けた吐出口から低圧で吐出する構成で、掘削孔横断
面内で均一に分散させ攪拌混合することが可能である。
しかし、１．５ｍを超えるような大口径の改良土柱を築
造するためには、固化材スラリーを掘削孔横断面全体に
均一に行き渡るように配慮することが肝要となる。In such an excavating and stirring apparatus, when constructing a large diameter improved soil column, the excavating blade and the stirring blade can be dealt with by simply increasing the length thereof. On the other hand, regarding the discharge of the solidifying material slurry, if the improved diameter is about 1.2 m to 1.5 m, the solidifying material slurry such as cement milk is discharged at a low pressure from the discharge port provided on the side surface at the tip of the excavation shaft. With such a configuration, it is possible to uniformly disperse and stir and mix within the cross section of the drill hole.
However, in order to build an improved soil column with a large diameter exceeding 1.5 m, it is important to consider that the solidifying agent slurry is evenly distributed over the entire cross section of the drill hole.
【０００４】掘削攪拌装置としては、従来から種々の装
置が開発されているが、固化材スラリーを掘削土横断面
全体に均一に行き渡らせる技術としては、例えば次のよ
うなものが提案されている。Various devices have been developed as excavation and agitation devices, but as a technique for uniformly spreading the solidifying material slurry over the entire cross section of the excavated soil, for example, the following has been proposed. .
【０００５】 掘削翼ガイド方式 例えば、特開平７−７６８２６号公報（切削混合機）に
記載されているように、掘削軸の先端に、下向き樋状の
カッタースポークと樋内に配列した多数の切刃からなる
掘削翼を取付け、掘削軸内の供給管内を供給されるセメ
ントミルクを掘削軸先端に設けた拡散板で受けると同時
に水平方向に拡散し、このセメントミルクを樋状のカッ
タースポーク内ガイド空間に導き、カッタースポーク全
体にセメントミルクを行き渡らせるものである。Excavation Blade Guide System For example, as described in Japanese Patent Application Laid-Open No. 7-76826 (Cutting Mixer), a downward gutter-shaped cutter spoke and a large number of cuts arranged in a gutter are provided at the tip of an excavation shaft. A drilling blade consisting of a blade is attached, and the cement milk supplied in the supply pipe inside the drilling shaft is received by the diffusion plate provided at the tip of the drilling shaft and at the same time diffused horizontally, and this cement milk is guided in the gutter-shaped cutter spokes. It leads to space and spreads cement milk over the entire cutter spoke.
【０００６】 吐出口の位置を掘削翼や攪拌翼にまで
延長する方式 例えば、特開昭６２−２７３３１６号公報（地盤改良装
置）では、掘削軸の先端部における攪拌翼あるいは掘削
翼に直径方向に間隔をおいて多数の吐出口を設けてい
る。また、特開平６−１４６２６４号公報（共回り防止
強制攪拌装置）では、セメントミルクを供給する供給管
を掘削翼まで延在させ、その先端の射出ノズルが掘削翼
の半径方向中央部に位置するようにしている。A method of extending the position of the discharge port to the excavating blade or the stirring blade. For example, in Japanese Patent Laid-Open No. 62-273316 (ground improvement device), the stirring blade at the tip of the excavating shaft or the excavating blade is diametrically extended. Many discharge ports are provided at intervals. Further, in JP-A-6-146264 (co-rotation preventive stirring device), a supply pipe for supplying cement milk is extended to the excavation blade, and an injection nozzle at the tip thereof is located at the center of the excavation blade in the radial direction. I am trying.
【０００７】[0007]
【発明が解決しようとする課題】前述の掘削翼ガイド方
式は、拡散板により水平に拡散させたセメントミルク
を、掘削翼をガイドとして全断面に均一に行き渡らせる
工夫をしているものの、セメントミルクを直接制御する
ことができない機構である。従って、セメントミルクが
全断面均一に攪拌混合する場合もあるが、うまく行かな
い場合もあるという欠点を有し、確実性に欠けるため、
大口径の改良土柱には適用し難い。Although the above-mentioned excavation blade guide system is devised so that the cement milk horizontally diffused by the diffusion plate is evenly distributed over the entire cross section by using the excavation blade as a guide, the cement milk is used. Is a mechanism that cannot directly control. Therefore, although cement milk may be stirred and mixed uniformly over the entire cross section, it has the drawback that it may not work well and lacks certainty.
It is difficult to apply to large diameter improved soil columns.
【０００８】また、前述の攪拌翼等に多数の吐出口を設
ける方式では、各吐出口からの吐出量が掘削軸から離れ
るに従って少なくなり、均一な攪拌混合ができないとい
う欠点がある。さらに、掘削翼中央に射出ノズルを設け
る方式では、掘削土横断面の外側部分についてはセメン
トミルクが均一に充填されるが、逆に内側部分について
はセメントミルクが供給されず、改良土柱全体が不均一
な改良体となる欠点があった。Further, in the above-described system in which a large number of discharge ports are provided in the stirring blade or the like, the discharge amount from each discharge port decreases as the distance from the excavation shaft increases, and uniform stirring and mixing cannot be performed. Furthermore, with the method of providing an injection nozzle in the center of the excavation blade, cement milk is uniformly filled in the outer part of the cross section of the excavated soil, but conversely, cement milk is not supplied in the inner part, and the entire improved soil column is There was a drawback that it resulted in a non-uniform improvement.
【０００９】この発明は、前述のような問題点を解消す
べくなされたもので、その目的は、大口径の改良土柱に
対しても固化材スラリーを掘削土横断面全体に均一に確
実に行き渡らせることができ、断面全体にわたって均一
な大口径改良土柱を容易に築造することのできる大口径
用掘削攪拌装置を提供することにある。The present invention has been made to solve the above-mentioned problems, and an object thereof is to ensure that the solidifying agent slurry is evenly and uniformly distributed over the entire cross section of excavated soil even for an improved soil column having a large diameter. It is an object of the present invention to provide a large-diameter excavation and stirring apparatus that can be spread over a whole area and that can easily construct a large-diameter improved soil column that is uniform over the entire cross section.
【００１０】[0010]
【課題を解決するための手段】本発明は、掘削土に固化
材液を添加しつつ混合攪拌して改良土柱を築造する掘削
攪拌装置において、掘削軸の先端部分における下部およ
び／または上部に吐出口を設け、この下部吐出口または
上部吐出口を掘削土柱径方向に位置の異なる少なくとも
２つの吐出口から構成し、この掘削土柱径方向に位置の
異なる吐出口のそれぞれに独立した固化材液（セメント
ミルクなど）の供給通路を接続したことを特徴とする。DISCLOSURE OF THE INVENTION The present invention relates to an excavation and agitation apparatus for constructing an improved soil column by mixing and agitating a solidifying material liquid into excavation soil to construct an improved soil column. A discharge port is provided, and the lower discharge port or the upper discharge port is composed of at least two discharge ports having different positions in the radial direction of the excavating soil column, and the solidification is independent for each of the discharge ports having different positions in the radial direction of the excavating soil column. The feature is that a supply passage for material liquid (such as cement milk) is connected.
【００１１】固化材液の吐出方法には、掘削・攪拌ヘッ
ドの貫入時（掘進・攪拌時）にのみ掘削軸の先端部分に
おける下部（掘削翼付近）の下部吐出口から吐出する方
法、引抜時（上昇・攪拌時）にのみ掘削軸の先端部分に
おける上部（最上段の攪拌翼付近）の上部吐出口から吐
出する方法、あるいは貫入時と引抜時の両方とも吐出す
る（貫入時に下部吐出口から、引抜時に上部吐出口から
吐出する）方法がある。従って、本発明では、貫入時の
み吐出する場合には、掘削軸の先端部分における下部
（掘削翼位置あるいは最下段の攪拌翼位置など）に少な
くとも２つの下部吐出口を設け、引抜時のみ吐出する場
合には、掘削軸の先端部分における上部（最上段の攪拌
翼位置付近など）に少なくとも２つの下部吐出口を設
け、貫入時と引抜時とも吐出する場合には、掘削軸の先
端部分における下部と上部に、少なくとも２つの下部吐
出口と少なくとも２つの上部吐出口をそれぞれ設けるこ
とになる。The solidifying material liquid is discharged from the lower discharge port at the lower portion (near the excavation blade) at the tip of the excavation shaft only when the excavation / agitation head is penetrated (during advancing / agitation), and at the time of withdrawal. Discharge from the upper discharge port at the top (near the uppermost stirring blade) at the tip of the excavation shaft only (when climbing / stirring), or discharge both at the time of penetration and at the time of extraction (from the lower discharge port at the time of penetration). , Discharge from the upper discharge port at the time of extraction). Therefore, in the present invention, in the case of discharging only at the time of penetration, at least two lower discharging ports are provided in the lower portion (such as the position of the excavating blade or the position of the stirring blade at the lowest stage) at the tip of the excavating shaft, and discharging only at the time of withdrawal. In this case, at least two lower discharge ports are provided in the upper part of the tip of the excavation shaft (near the position of the uppermost stirring blade, etc.), and when discharging both during penetration and withdrawal, the lower part of the tip of the excavation shaft At least two lower discharge ports and at least two upper discharge ports are provided at the upper part and the upper part, respectively.
【００１２】下部吐出口または上部吐出口は、掘削翼あ
るいは攪拌翼の掘削軸近傍と半径方向中央部に設けても
よいが、一つを掘削軸の先端部分の側面に、他を掘削翼
あるいは攪拌翼の半径方向中間部に設けるのが、構造上
の点などから好ましい。また、掘削軸側の内側吐出口と
攪拌翼側の外側吐出口とには、それぞれ独立した固化材
液供給通路が接続されるが、各固化材液供給通路には、
掘削攪拌装置の外部の固化材液タンクから個別に固化材
液を供給可能とし、各吐出口からそれぞれ任意の吐出量
で固化材液が噴出される。The lower discharge port or the upper discharge port may be provided in the vicinity of the excavation axis of the excavation blade or the stirring blade and in the center in the radial direction. It is preferable to provide the stirring blade at an intermediate portion in the radial direction from the viewpoint of structure. Further, independent solidifying material liquid supply passages are connected to the inner discharge outlet on the excavating shaft side and the outer discharge outlet on the stirring blade side, respectively.
The solidifying material liquid can be individually supplied from the solidifying material liquid tank outside the excavator and agitator, and the solidifying material liquid is jetted from each discharge port at an arbitrary discharge amount.
【００１３】[0013]
【作用】以上のような構成において、掘削軸側面または
掘削軸近傍の内側吐出口および翼中間部の外側吐出口か
ら固化材液が同時に噴出され、内側吐出口からの固化材
スラリーが掘削軸近傍の掘削土内側部分に十分に供給さ
れ、外側吐出口からの固化材スラリーが掘削土の周囲部
分まで到達して掘削土外側部分に十分に供給される。さ
らに、各吐出口のそれぞれに独立した固化材液供給通路
が接続されるため、各吐出口からの固化材液の吐出量を
口径の大きさに応じて任意に設定することにより、各吐
出口から所定の吐出量だけを確実に吐出することがで
き、直径が１．５ｍを超えるような大口径の改良土柱で
も固化材液を横断面全体に均一に、かつ確実に行き渡ら
せることができる。With the above-mentioned structure, the solidifying material liquid is simultaneously ejected from the inner discharge port on the side of the excavation shaft or near the excavation shaft and the outer discharge port of the blade middle part, and the solidifying material slurry from the inner discharge port is in the vicinity of the excavation shaft. Is sufficiently supplied to the inner portion of the excavated soil, and the solidifying material slurry from the outer discharge port reaches the peripheral portion of the excavated soil and is sufficiently supplied to the outer portion of the excavated soil. Furthermore, since an independent solidifying material liquid supply passage is connected to each discharge port, the discharge amount of the solidifying material liquid from each discharge port can be arbitrarily set according to the size of the discharge port. It is possible to reliably discharge only a predetermined discharge amount, and it is possible to evenly and reliably spread the solidifying material liquid over the entire cross-section even in the case of a large diameter improved soil column whose diameter exceeds 1.5 m. .
【００１４】[0014]
【実施例】以下、この発明を図示する一実施例に基づい
て説明する。図１は、この発明に係る大口径用掘削攪拌
装置における掘削軸の先端部分を示し、図２はその横断
面を示す。図１において、図示しない掘削軸本体の先端
部分に掘削・攪拌ヘッドＡが取付けられ、この掘削・攪
拌ヘッドＡの掘削軸１に、下から順に、掘削軸先端の掘
削ビット２と、複数の掘削刃を備えた二枚の掘削翼３
と、掘削軸１に対して回転自在に支持され固定状態で土
の共回りを阻止する共回り防止翼４と、複数段の攪拌翼
５とが取付けられている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment. FIG. 1 shows a tip end portion of an excavation shaft in a large-diameter excavation stirring device according to the present invention, and FIG. 2 shows a cross section thereof. In FIG. 1, an excavation / agitation head A is attached to a tip end portion of an excavation shaft body (not shown), and an excavation shaft 1 of the excavation / agitation head A has an excavation bit 2 at the tip of the excavation shaft and a plurality of excavations in order from the bottom. Two blades with blades 3
Further, a co-rotation preventing blade 4 which is rotatably supported with respect to the excavation shaft 1 and prevents co-rotation of soil in a fixed state, and a plurality of stages of stirring blades 5 are attached.
【００１５】なお、掘削軸本体は上部に回転駆動装置を
有し、この回転駆動装置を介して装置本体のリーダに上
下移動可能に支持され、回転駆動装置を吊りワイヤロー
プで昇降させることにより、掘削・攪拌ヘッドが回転し
つつ掘進下降し、また引揚上昇する（図示省略）。The excavation shaft main body has a rotary drive unit on its upper part, and is supported by the reader of the main body of the unit via the rotary drive unit so as to be movable up and down. By raising and lowering the rotary drive unit by a hanging wire rope, The excavation and agitation head rotates and moves up and down, and also lifts and rises (not shown).
【００１６】このような掘削・攪拌ヘッドＡにおいて、
図１，図２に示すように、掘削軸１の下端における側面
に吐出口１０を設け、一対の掘削翼３の一方に吐出口１
１を設け、内側の掘削軸吐出口１０と外側の掘削翼吐出
口１１により下部吐出口を構成する。掘削軸吐出口１０
は、一対の掘削翼３の取付け部分の間に一箇所設け、掘
削翼吐出口１１は、掘削軸１から掘削翼３の傾斜する裏
面に添設した水平供給管１２の先端に形成することによ
り、掘削翼３の半径方向中央部に一箇所設ける。この実
施例では、掘削軸吐出口１０と掘削翼吐出口１１の吐出
方向は互いに反対方向となるようにしている（図２参
照）。In such an excavation / agitation head A,
As shown in FIGS. 1 and 2, a discharge port 10 is provided on the side surface at the lower end of the excavation shaft 1, and the discharge port 1 is provided on one of the pair of excavation blades 3.
1 is provided, and the inner excavating shaft discharge port 10 and the outer excavating blade discharge port 11 constitute a lower discharge port. Drilling shaft discharge port 10
Is provided at one place between the mounting portions of the pair of excavation blades 3, and the excavation blade discharge port 11 is formed at the tip of the horizontal supply pipe 12 attached to the inclined back surface of the excavation blade 1 from the excavation shaft 1. Provided at one location in the radial center of the excavation blade 3. In this embodiment, the discharge directions of the excavation shaft discharge port 10 and the excavation blade discharge port 11 are opposite to each other (see FIG. 2).
【００１７】掘削軸吐出口１０および掘削翼吐出口１１
の水平供給管１２には、それぞれ独立した固化材スラリ
ー供給通路１３，１４を接続する。この固化材スラリー
供給通路１３，１４は、掘削軸１および掘削軸本体内に
設けた供給管あるいは供給孔などとし、掘削軸本体の上
端部に設けたスイベル、ホース等を介して、外部に設置
したミキシングプラントのポンプに接続し、各吐出口１
０，１１に個別に固化材スラリーを供給可能とする。Excavation shaft discharge port 10 and excavation blade discharge port 11
The independent solidifying material slurry supply passages 13 and 14 are connected to the horizontal supply pipe 12 of FIG. The solidified material slurry supply passages 13 and 14 are supply pipes or supply holes provided in the excavation shaft 1 and the excavation shaft main body, and are installed outside via a swivel, a hose, etc. provided at the upper end of the excavation shaft main body. Connected to the pump of the mixing plant, each discharge port 1
The solidifying material slurry can be individually supplied to 0 and 11.
【００１８】また、ポンプは二台設置し、それぞれのポ
ンプに流量調整弁を介して掘削軸吐出口１０用のホース
と掘削翼吐出口１１用のホースを接続するなどして、各
吐出口１０，１１毎に吐出量を設定し、調整できるよう
にする。Further, two pumps are installed, and a hose for the excavation shaft discharge port 10 and a hose for the excavation blade discharge port 11 are connected to each pump via a flow rate adjusting valve, and the like, so that each discharge port 10 is connected. , 11 so that the discharge amount can be set and adjusted.
【００１９】なお、掘削軸吐出口１０は、掘削軸１の対
向する側面に一対で配設してもよい。掘削翼吐出口１１
は、もう一方の掘削翼３にも設けてもよいし、掘削翼３
の半径方向中間部に間隔をおいて複数配設するようにし
てもよい。また、掘削翼吐出口１１は最下段の攪拌翼５
-1に水平供給管１２’を介して設け、この攪拌翼吐出口
１１’と掘削軸吐出口１０とにより下部吐出口を構成し
てもよい。さらに、掘削軸吐出口１０をなくし、最下段
の攪拌翼５-1の近傍における掘削軸１の側面に掘削軸吐
出口１０’を設け、この掘削軸吐出口１０’と攪拌翼吐
出口１１’とにより下部吐出口を構成してもよい。ま
た、掘削軸吐出口１０，１０’を無くし、掘削翼吐出口
１１あるいは攪拌翼吐出口１１’を掘削翼３あるいは攪
拌翼５における掘削軸１の近傍と半径方向中央部とに設
けるようにしてもよい。The excavation shaft discharge ports 10 may be provided in a pair on the opposite side surfaces of the excavation shaft 1. Drilling blade outlet 11
May be provided on the other excavation blade 3 as well.
It is also possible to dispose a plurality of them at intervals in the middle part in the radial direction. Further, the excavating blade discharge port 11 is the lowermost stirring blade 5
-1 may be provided via a horizontal supply pipe 12 ', and the stirring blade discharge port 11' and the excavation shaft discharge port 10 may constitute a lower discharge port. Further, the excavating shaft discharge port 10 is eliminated, and a excavating shaft discharge port 10 'is provided on the side surface of the excavating shaft 1 in the vicinity of the lowermost stirring blade 5-1 . The excavating shaft discharge port 10' and the stirring blade discharge port 11 'are provided. You may comprise a lower discharge port by. Further, the excavating shaft discharge ports 10 and 10 'are eliminated, and the excavating blade discharge port 11 or the stirring blade discharge port 11' is provided in the excavating blade 3 or the stirring blade 5 in the vicinity of the excavating shaft 1 and in the central portion in the radial direction. Good.
【００２０】掘削軸吐出口１０，１０’あるいは翼吐出
口１１，１１’を、複数配設する場合には、複数個の吐
出口１０，１０’あるいは１１，１１’に共通の固化材
スラリー供給通路から固化材スラリーを供給可能として
もよいし、複数個の吐出口１０あるいは１１に対して独
立した固化材スラリー供給通路をそれぞれ接続するよう
にしてもよい。When a plurality of excavating shaft discharge ports 10 and 10 'or blade discharge ports 11 and 11' are arranged, a common solidifying material slurry is supplied to the discharge ports 10 and 10 'or 11 and 11'. The solidifying material slurry may be supplied from the passage, or independent solidifying material slurry supply passages may be connected to the plurality of discharge ports 10 or 11, respectively.
【００２１】以上は、下部吐出口の構成についてのみ説
明したが、引抜時吐出方法あるいは貫入時・引抜時吐出
方法を行う場合には、上部吐出口を設ける。この上部吐
出口は、下部吐出口と同様に、最上段の攪拌翼５-4の取
付け部分の若干上方における掘削軸１の側面に設けた掘
削軸吐出口１０”と、この攪拌翼５-4の半径方向中間部
に水平供給管１２”を介して設けた攪拌翼吐出口１１”
から構成する。Although only the structure of the lower discharge port has been described above, the upper discharge port is provided when the discharge method during drawing or the discharge method during penetration / drawing is performed. This upper discharge port is similar to the lower discharge port, and the excavation shaft discharge port 10 ″ provided on the side surface of the excavation shaft 1 slightly above the mounting portion of the uppermost stirring blade 5-4 and this stirring blade 5-4. Stirring blade discharge port 11 "provided through a horizontal supply pipe 12" in the radial middle part of the
It consists of.
【００２２】なお、この掘削軸吐出口１０”と攪拌翼吐
出口１１”の場合も、下部吐出口と同様に、それぞれ複
数個配設する、上部の適当な位置に配設する、攪拌翼の
掘削軸近傍と半径方向中央部に設けるなどの種々の態様
をとることができる。また、掘削軸吐出口１０”と攪拌
翼吐出口１１”のそれぞれの固化材スラリー供給通路１
３”および１４”は、下部吐出口の固化材スラリー供給
通路１３および１４とそれぞれ別個独立とする。Also in the case of the excavating shaft discharge port 10 "and the stirring blade discharge port 11", a plurality of the stirring blades are provided at the appropriate positions in the upper part, like the lower discharge port. Various modes can be adopted, such as being provided in the vicinity of the excavation axis and in the central portion in the radial direction. Further, the solidified material slurry supply passages 1 of the excavation shaft discharge port 10 ″ and the stirring blade discharge port 11 ″, respectively.
3 "and 14" are separate and independent from the solidified material slurry supply passages 13 and 14 of the lower discharge port.
【００２３】この場合には、例えば、１３”と１３を２
重管から構成して、１３”を掘削軸吐出口１０”に連通
し、１３を掘削軸吐出口１０に連通し、掘削軸本体の上
部に設けた流路切替装置により１３”と１３とを選択可
能とし、上部の掘削軸吐出口１０”と下部の掘削軸吐出
口１０とを任意に選択し、かつそれぞれから所定の吐出
量の固化材スラリーを噴出可能とする。１４”と１４も
同様にする。In this case, for example, 13 "and 13 are 2
It is composed of a heavy pipe, and 13 "communicates with the excavating shaft discharge port 10", 13 communicates with the excavating shaft discharge port 10, and 13 "and 13 are connected by a flow path switching device provided on the upper part of the excavating shaft body. The upper excavating shaft discharge port 10 ″ and the lower excavating shaft discharge port 10 are arbitrarily selected, and a predetermined amount of the solidified material slurry can be ejected from each. The same applies to 14 "and 14.
【００２４】以上のような構成において、直径が１．５
ｍを超える改良土柱に対して、例えば次のような手順で
深層地盤改良を行う。In the above structure, the diameter is 1.5.
For the improved soil columns exceeding m, for example, deep soil improvement is performed by the following procedure.
【００２５】(1) 築造すべき改良土柱の径に応じて各吐
出口１０，１１からの吐出量をそれぞれ設定しておき、
掘削軸を回転させつつ下降させる。(1) The discharge amounts from the discharge ports 10 and 11 are set according to the diameter of the improved soil pillar to be built,
The excavation shaft is rotated and lowered.
【００２６】(2) 所定の深度に達すると、固化材スラリ
ーを各吐出口１０，１１から同時に噴出しつつ掘進・混
合攪拌を行う。(2) When a predetermined depth is reached, the solidified material slurry is simultaneously ejected from the respective discharge ports 10 and 11 to perform excavation and mixing and stirring.
【００２７】(3) 貫入時吐出方法では、最下端まで達す
ると、掘削軸を逆転させて引き上げ、各吐出口１０，１
１から固化材スラリーは圧送を停止して再び混合攪拌を
行う。(3) In the penetration discharge method, when the bottom end is reached, the excavation shaft is reversed and pulled up, and the discharge ports 10, 1
From 1, the solidifying material slurry is stopped from being pumped and mixed and stirred again.
【００２８】地盤改良区間から掘削軸を回転させつつ引
き揚げて、施工を終了する。The excavation shaft is rotated and lifted from the ground improvement section to complete the construction.
【００２９】貫入時・引抜時吐出方法では、最下端まで
達すると、下部の吐出口１０，１１から上部の吐出口１
０”，１１”に切替え、掘削軸を逆転させて引き上げな
がら、固化材スラリーを上部の吐出口１０”，１１”か
ら同時に噴出しつつ再び混合攪拌を行う。地盤改良区間
の注入・攪拌・引揚が終了すると、各吐出口１０”，１
１”からの固化材スラリーの噴出を停止し、掘削軸を回
転させつつ引き揚げて、施工を終了する。In the discharge method at the time of penetration / pull-out, when the lowermost end is reached, the discharge ports 10 and 11 at the lower part to the discharge port 1 at the upper part.
While switching to 0 ″ and 11 ″, the excavating shaft is reversed and pulled up, the solidified material slurry is simultaneously ejected from the upper discharge ports 10 ″ and 11 ″, and mixing and stirring are performed again. When injection, stirring, and lifting in the ground improvement section are completed, each discharge port 10 ", 1
The jetting of the solidified material slurry from 1 ″ is stopped, the excavation shaft is rotated, and the work is lifted up to finish the construction.
【００３０】内側の掘削軸吐出口１０あるいは１０”と
外側の掘削翼吐出口１１あるいは１１”からそれぞれ個
別に設定された所要の吐出量で固化材スラリーが噴出さ
れ、固化材スラリーが掘削土の横断面全体に均一に、か
つ確実に分散され、攪拌混合され、全体にわたって均一
な改良土柱が得られる。The solidifying material slurry is ejected from the inner excavating shaft discharge port 10 or 10 "and the outer excavating blade discharging port 11 or 11" at a required discharge amount set individually, and the solidifying material slurry is converted into excavated soil. It is uniformly and surely dispersed over the entire cross section, stirred and mixed, and an improved soil column that is uniform throughout is obtained.
【００３１】なお、以上は深層地盤改良工法について説
明したが、これに限らず、その他の地盤改良工法にも本
発明を適用できることはいうまでもない。Although the deep ground improvement method has been described above, it is needless to say that the present invention can be applied to other ground improvement methods.
【００３２】[0032]
【発明の効果】前述の通り、この発明は、掘削軸の先端
部分に、掘削土柱径方向に位置の異なる少なくとも２つ
の吐出口、例えば掘削軸の先端部側面と掘削翼あるいは
攪拌翼の半径方向中間部とに吐出口を設け、これら各吐
出口に、それぞれ独立して固化材液を供給可能としたた
め、掘削土の内側と外側に固化材液を供給することがで
きると共に、それぞれの吐出量を任意に設定することが
でき、大口径の改良土柱であっても、固化材液を断面全
体にわたって均一に、かつ確実に行き渡らせることがで
き、全体にわたって均一な大口径改良土柱を容易に築造
することができる。As described above, according to the present invention, at least two discharge ports at different positions in the radial direction of the excavating soil column are provided at the tip portion of the excavating shaft, for example, the tip side surface of the excavating shaft and the radius of the excavating blade or the stirring blade. Since the discharge ports are provided in the middle part of the direction and the solidifying material liquid can be supplied to each of these discharge openings independently, it is possible to supply the solidifying material liquid to the inside and the outside of the excavated soil, and to discharge each of them. The amount can be set arbitrarily, and even with a large diameter improved soil column, the solidifying material liquid can be evenly and surely spread over the entire cross section, and a large diameter improved soil column can be uniformly distributed over the entire area. It can be built easily.
【図１】この発明に係る大口径用掘削攪拌装置の先端部
分の一実施例を示す側面図である。FIG. 1 is a side view showing an embodiment of a tip portion of a large-diameter excavating and stirring apparatus according to the present invention.
【図２】図１の横断面図である。2 is a cross-sectional view of FIG.
１…掘削軸 ２…掘削ビット ３…掘削翼 ４…共回り防止翼 ５…攪拌翼 １０…掘削軸吐出口 １１…掘削翼吐出口 １２…水平供給管 １３…掘削軸吐出口用の固化材スラリー供給通路 １４…掘削翼吐出口用の固化材スラリー供給通路 DESCRIPTION OF SYMBOLS 1 ... Excavation shaft 2 ... Excavation bit 3 ... Excavation blade 4 ... Co-rotation prevention blade 5 ... Stirring blade 10 ... Excavation shaft discharge port 11 ... Excavation blade discharge port 12 ... Horizontal supply pipe 13 ... Solidification material slurry for excavation shaft discharge port Supply passage 14 ... Solidifying material slurry supply passage for excavation blade discharge port
Claims (2)
して改良土柱を築造する掘削攪拌装置において、 掘削軸の先端部分における下部および／または上部に吐
出口を設け、この下部吐出口または上部吐出口を掘削土
柱径方向に位置の異なる少なくとも２つの吐出口から構
成し、この掘削土柱径方向に位置の異なる吐出口のそれ
ぞれに独立した固化材液の供給通路を接続したことを特
徴とする大口径用掘削攪拌装置。1. A drilling and agitating device for constructing an improved soil column by mixing and agitating solidifying material liquid to excavated soil to construct an improved soil column, wherein a discharge port is provided at a lower portion and / or an upper portion of a tip portion of an excavation shaft, The outlet or the upper discharge port is composed of at least two discharge ports at different positions in the radial direction of the excavating soil column, and independent supply passages for the solidifying material liquid are connected to the discharge ports at different positions in the radial direction of the excavating soil column. A large-diameter drilling and stirring device characterized by the above.
において、吐出口は、掘削軸の先端部分における側面
と、掘削翼または攪拌翼の半径方向中間部とに設けるこ
とを特徴とする大口径用掘削攪拌装置。2. The large-diameter excavating and stirring apparatus according to claim 1, wherein the discharge port is provided on a side surface at a tip end portion of the excavating shaft and a radial intermediate portion of the excavating blade or the stirring blade. Excavator and stirrer for large diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14453595A JP3464076B2 (en) | 1995-06-12 | 1995-06-12 | Excavation stirrer for large diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14453595A JP3464076B2 (en) | 1995-06-12 | 1995-06-12 | Excavation stirrer for large diameter |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001305093A Division JP3423705B2 (en) | 2001-10-01 | 2001-10-01 | Construction method of large diameter improved soil column |
| JP2001305092A Division JP3423704B2 (en) | 2001-10-01 | 2001-10-01 | Construction method of large diameter improved soil column |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08338017A true JPH08338017A (en) | 1996-12-24 |
| JP3464076B2 JP3464076B2 (en) | 2003-11-05 |
Family
ID=15364577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14453595A Expired - Lifetime JP3464076B2 (en) | 1995-06-12 | 1995-06-12 | Excavation stirrer for large diameter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3464076B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074049A (en) * | 2001-09-06 | 2003-03-12 | Fudo Constr Co Ltd | Device and method for constructing solidified piles |
| JP2013136916A (en) * | 2011-12-28 | 2013-07-11 | Asahi Kasei Construction Materials Co Ltd | Ground improvement device and ground improvement method |
| WO2020248702A1 (en) * | 2019-06-11 | 2020-12-17 | 东南大学 | Bidirectional overall stirring apparatus and method for reinforcing shallow soft foundation using same |
-
1995
- 1995-06-12 JP JP14453595A patent/JP3464076B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074049A (en) * | 2001-09-06 | 2003-03-12 | Fudo Constr Co Ltd | Device and method for constructing solidified piles |
| JP4702821B2 (en) * | 2001-09-06 | 2011-06-15 | 株式会社不動テトラ | Solidification pile construction device and construction method |
| JP2013136916A (en) * | 2011-12-28 | 2013-07-11 | Asahi Kasei Construction Materials Co Ltd | Ground improvement device and ground improvement method |
| WO2020248702A1 (en) * | 2019-06-11 | 2020-12-17 | 东南大学 | Bidirectional overall stirring apparatus and method for reinforcing shallow soft foundation using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3464076B2 (en) | 2003-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5304016A (en) | Method for forming a pillar in an earthen foundation | |
| US6843003B2 (en) | Gravel-like material removing device | |
| JPH0160614B2 (en) | ||
| JPH0452333B2 (en) | ||
| JP3423705B2 (en) | Construction method of large diameter improved soil column | |
| KR101904485B1 (en) | Mixing apparatus of high and low pressure injection for soil improving and soil improving construction method using it | |
| JP4944926B2 (en) | Ground hardening layer construction method and its equipment | |
| JP4072968B2 (en) | Columnar pile building device and columnar pile building method | |
| JP3464076B2 (en) | Excavation stirrer for large diameter | |
| JP2020070593A (en) | Ground improvement device and ground improvement method | |
| JP3423704B2 (en) | Construction method of large diameter improved soil column | |
| JPH1088564A (en) | Jet grout method | |
| JP2647572B2 (en) | Ground improvement method | |
| JPH0931967A (en) | Mixing and agitating device using mechanical agitation and high pressure jet combinedly | |
| JPS6353327B2 (en) | ||
| JPS5830446B2 (en) | Strainer injection device for soil stabilization chemicals | |
| JPS61113923A (en) | Ground improving method | |
| JPH11350468A (en) | Ground improving method and ground improving device | |
| JP2004019221A (en) | Jet agitating device using cross jet stream | |
| JPH03197714A (en) | Method and device for soil improvement | |
| JP2005113573A (en) | Composite pile and its execution method | |
| JP2004150073A (en) | High-pressure jet mixing method | |
| JP2728633B2 (en) | Construction method and construction device for soil cement pile | |
| JPH06346436A (en) | Ground improvement method by jet grouting | |
| JP2756870B2 (en) | Soft ground improvement equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090822 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120822 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120822 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150822 Year of fee payment: 12 |
|
| EXPY | Cancellation because of completion of term |