JP2008031701A - Ground improvement device - Google Patents

Ground improvement device Download PDF

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JP2008031701A
JP2008031701A JP2006205121A JP2006205121A JP2008031701A JP 2008031701 A JP2008031701 A JP 2008031701A JP 2006205121 A JP2006205121 A JP 2006205121A JP 2006205121 A JP2006205121 A JP 2006205121A JP 2008031701 A JP2008031701 A JP 2008031701A
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ground
outer cylinder
head
rod
transmission rod
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JP4913494B2 (en
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Kanji Higaki
檜垣貫司
Hiroyasu Ishii
石井裕泰
Kunihiro Ogasawara
小笠原邦洋
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Taisei Corp
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Taisei Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of improving the ground under an existing structure which cannot be improved by linear boring. <P>SOLUTION: A pipe rod is composed of a transmission rod 2 connected in the longitudinal direction and a cylindrical front end rod installed on the tip of the transmission rod 2. After recovering a boring advancing head and a positional information transmitter slidingly stored in the front end rod, a high pressure injection cylinder is inserted into a cavity of its recovery trace. A hardening agent is injected into the ground under high pressure via the high pressure injection cylinder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、いわゆる自在ボーリングによって、直線状及び曲線状に地盤を掘削し硬化剤を高圧噴射して地盤を改良する装置に関するものである。   The present invention relates to an apparatus for improving a ground by excavating the ground in a straight line and a curved line by using so-called free boring and injecting a hardener at a high pressure.

いわゆる自在ボーリングとは、伝達ロッドに内蔵した位置情報発信器から地盤内での位置情報を取得しつつ、直線状及び曲線状に地盤を掘削して長孔を形成し、この長孔内を利用してグラウト材を注入する工法である。
So-called boring means that the position information in the ground is acquired from the position information transmitter built in the transmission rod, and the ground is excavated in a straight line and a curved shape to form a long hole. The grout material is then injected.

上記したような自在ボーリングの一例として特許文献１に記載したような技術が知られている。
これは自在ボーリングを行う前端ロッドの内部に位置情報発信器を設置しておき、この位置情報発信器と前端ロッドとを取り付けたワイヤを引っ張って地上に回収できる装置であり、位置情報発信器と前端ロッドとの回収後の長い空洞に薬液注入管を挿入して地中に薬液を注入する。
特開２００５−１５５２０９号公報。 A technique as described in Patent Document 1 is known as an example of the above-described free boring.
This is a device in which a position information transmitter is installed inside the front end rod that performs free boring, and a wire to which the position information transmitter and the front end rod are attached can be collected on the ground. A chemical solution injection tube is inserted into the long cavity after collection with the front end rod to inject the chemical solution into the ground.
JP-A-2005-155209.

上記のような既存の装置に対して本発明は、円筒状のロッドを長手方向に沿って連結した伝達ロッドと、伝達ロッドの先端に取り付けた円筒状の前端ロッドと、この前端ロッドの内部にスライド自在に収納した掘進頭部および位置情報発信器と、掘進頭部と位置情報発信器を回収後に、その回収跡の空洞に挿入するための高圧噴射筒とより構成し、この高圧噴射筒を通して地中へ高圧で硬化剤を噴射することを特徴とする地盤改良装置である。
In contrast to the existing apparatus as described above, the present invention provides a transmission rod in which cylindrical rods are connected along the longitudinal direction, a cylindrical front end rod attached to the front end of the transmission rod, and an interior of the front end rod. The digging head and position information transmitter housed slidably, and the high pressure injection cylinder for inserting the digging head and position information transmitter into the cavity of the collection trace after collecting the excavation head and position information transmitter, The ground improvement device is characterized by injecting a curing agent into the ground at a high pressure.

本発明は上記したようになるから、次のような効果を期待できる。
＜１＞ 簡単な装置によって、地盤の改良を行うことができる。
＜２＞ 特に、直線的なボーリングでは対応できない既設の構造物等の下方の地盤で改良を行うことができる。
＜３＞ 既設構造物の下部でなくとも、地震で液状化しやすい砂質地盤の改良や、地下水位の低下による地盤沈下を生じやすい軟弱地盤の改良などを行うことができる。
Since the present invention is as described above, the following effects can be expected.
<1> The ground can be improved with a simple device.
<2> In particular, the improvement can be performed on the ground below the existing structure or the like that cannot be handled by linear boring.
<3> Even if it is not the lower part of the existing structure, it is possible to improve sandy ground that is liable to be liquefied by an earthquake or soft ground that is liable to cause land subsidence due to a drop in groundwater level.

以下、本発明の地盤改良装置の実施例について説明する。     Examples of the ground improvement device of the present invention will be described below.

＜１＞ 前提条件。
本発明の地盤改良装置は、いわゆる「自在ボーリング装置」を利用するものである。
この自在ボーリングを図２にしたがって詳細に説明する、単管を長手方向に沿って連結した伝達ロッド２と、その伝達ロッド２の先端に取り付けた円筒状の前端ロッド１と、この前端ロッド１の内部にスライド自在に収納した掘進頭部１２および位置情報発信器１３とによって構成する。
その際に、前端ロッド１の先端面が推進方向に対して直角面ではなく、一定の傾斜面を形成していること、および伝達ロッド２が前端ロッド１に対して回転を与えることができ、伝達ロッド２を通る圧力流体で掘進頭部１２に推進力を与えることができることが特徴である。
直線状の掘削を行う時には、伝達ロッド２を地上のボーリングマシン５によって回転させつつ前端ロッド１に推進力を付与する。
この回転力は前端ロッド１に伝達して回転するから、先端が傾斜していても次々に位置を変えることによって一方へ偏心することなく、直進させることができる。
一方、曲線状に掘削を行う時には、伝達ロッド２および前端ロッド１の回転を設定した角度で停止して推進力だけを付与する。
すると前端ロッド１の前端の受圧傾斜面１２ｃが地山からの土圧によって傾斜面の方向に滑るように誘導され、徐々に曲線状の掘削がなされることになる。
地中のどの位置で直線掘削を行い、どの位置から曲線掘削を行うかは、前端ロッド１の内部に収納した位置情報発信器１３からの信号を地上で受けて決定する。
以下、各装置について具体的に説明する。 <1> Precondition.
The ground improvement device of the present invention utilizes a so-called “universal boring device”.
The universal boring will be described in detail with reference to FIG. 2. A transmission rod 2 in which single pipes are connected along the longitudinal direction, a cylindrical front end rod 1 attached to the distal end of the transmission rod 2, and the front end rod 1 The digging head 12 and the position information transmitter 13 are slidably housed inside.
At that time, the front end surface of the front end rod 1 is not a plane perpendicular to the propulsion direction but forms a constant inclined surface, and the transmission rod 2 can rotate the front end rod 1; It is a feature that propulsive force can be given to the excavation head 12 by the pressure fluid passing through the transmission rod 2.
When straight excavation is performed, a propulsive force is applied to the front end rod 1 while the transmission rod 2 is rotated by the ground boring machine 5.
Since this rotational force is transmitted to the front end rod 1 and rotates, even if the tip is inclined, it can be moved straight without changing to one side by changing the position one after another.
On the other hand, when excavating in a curved shape, the rotation of the transmission rod 2 and the front end rod 1 is stopped at a set angle, and only propulsive force is applied.
Then, the pressure receiving inclined surface 12c at the front end of the front end rod 1 is guided to slide in the direction of the inclined surface by the earth pressure from the natural ground, and the curved excavation is gradually performed.
Which position in the ground is used for the straight excavation and from which position the curved excavation is performed is determined by receiving a signal from the position information transmitter 13 stored in the front end rod 1 on the ground.
Hereinafter, each device will be specifically described.

＜２＞前端ロッド。（図１、２）
前端ロッド１は、単管を長手方向に沿って連結した伝達ロッド２の先端に取り付けた外筒１１と、その外筒１１の内部に収納した掘進頭部１２などによって構成する。
前端ロッド１の外筒１１の内径は、伝達ロッド２の内径と同一であり、その内部を後述する装着型注入ヘッド３や貫通型ヘッド４の通過が可能である。
なお本明細書で、前端、前方とは、掘進時にこの装置が前進する方向を意味する。 <2> Front end rod. (Figures 1 and 2)
The front end rod 1 is constituted by an outer cylinder 11 attached to the distal end of a transmission rod 2 in which single pipes are connected along the longitudinal direction, an excavation head 12 housed in the outer cylinder 11, and the like.
The inner diameter of the outer cylinder 11 of the front end rod 1 is the same as the inner diameter of the transmission rod 2, and the inside of the mounting type injection head 3 and the penetration type head 4 which will be described later can pass through the inside.
In the present specification, the front end and the front mean the direction in which the device advances during excavation.

＜３＞外筒。（図１、２）
前端ロッド１を構成する外筒１１は円筒体であるが、掘進時に前方に位置する端面、すなわち前端は、円筒の中心軸に直交する面ではなく、９０度以外の角度で交わって、竹やりの先端のように形成してある。
その内面のほとんどは円筒状であるが、前端側の一部には、内部へ突出した段差を、係合段１１ａとして形成する。
外筒１１には後方の伝達ロッド２を介して地上から回転力を与えることができる。
さらに外筒１１の内面には、外筒１の軸方向に並行な突条をキー１１ｂとして突設させる。 <3> Outer cylinder. (Figures 1 and 2)
The outer cylinder 11 constituting the front end rod 1 is a cylindrical body, but the end face located forward when excavating, that is, the front end is not a plane orthogonal to the central axis of the cylinder but intersects at an angle other than 90 degrees, It is formed like a tip.
Although most of the inner surface is cylindrical, a step projecting inward is formed as an engaging step 11a on a part of the front end side.
A rotational force can be applied to the outer cylinder 11 from the ground via the rear transmission rod 2.
Furthermore, a protrusion parallel to the axial direction of the outer cylinder 1 is projected on the inner surface of the outer cylinder 11 as a key 11b.

＜４＞掘進頭部１２。（図１、２）
外筒１１の内部に収納する部材は、掘進頭部１２と位置情報発信器１３とによって構成する。
位置情報発信器１３は、位置情報を検知し発信する発信部やバッテリーを円筒状のケースに内蔵した装置である。
掘進頭部１２はその外径が、外筒１１の内径とほぼ等しい円柱体である。
掘進頭部１２の前端は円柱の中心軸に直交する面ではなく、外筒１１と同じ９０度以外の角度で交わって、外筒１１の前端にと同様に竹やりの先端のように加工して受圧傾斜面１２ｃ形成してある。
さらに掘進頭部１２の前端の一部に切り欠き１２ｂを形成し、この切り欠き１２ｂが外筒１１の内部へ突出した段差部１１ａと係合して掘進頭部１２が外筒１１の前端から前方へ露出することを阻止している。
掘進頭部１２の後方には前方ゴム環１４を介して位置情報発信器１３を取り付け、この位置情報発信器１３の後方には後方ゴム環１５を介して受圧円盤１６を取り付ける。
前方ゴム環１４と後方ゴム環１５は、外筒１１の内面に対して緩く弾性接触する程度の外径をもつ軸方向で短い円盤状である。
このため、外筒１１の内面との間で、掘削流体に対するシール性が確保される一方、各ゴム環が短い円盤状であるため、位置情報発信器１３を回収する際には、伝達ロッド２の半径の小さい曲線が存在してもゴム環１４、１５の弾性変形により容易に通過することができる。
掘進頭部１２の一部にはキー溝１２ｄを刻設し、このキー溝１２ｄが、外筒１内面のキー１１ｂにかみ合うことによって、外筒１１の回転を掘進頭部１２に伝達しうるように構成する。 <4> Excavation head 12. (Figures 1 and 2)
The member housed inside the outer cylinder 11 is constituted by the excavation head 12 and the position information transmitter 13.
The position information transmitter 13 is a device in which a transmitter and a battery for detecting and transmitting position information are incorporated in a cylindrical case.
The digging head 12 is a cylindrical body whose outer diameter is substantially equal to the inner diameter of the outer cylinder 11.
The front end of the digging head 12 is not a plane orthogonal to the central axis of the cylinder, but intersects at an angle other than 90 degrees, which is the same as that of the outer cylinder 11, and is processed like a bamboo tip like the front end of the outer cylinder 11. A pressure receiving inclined surface 12c is formed.
Further, a notch 12 b is formed in a part of the front end of the digging head 12, and this notch 12 b is engaged with a stepped portion 11 a that protrudes into the outer cylinder 11, so that the digging head 12 extends from the front end of the outer cylinder 11. Preventing forward exposure.
A position information transmitter 13 is attached to the rear of the excavation head 12 via a front rubber ring 14, and a pressure receiving disk 16 is attached to the rear of the position information transmitter 13 via a rear rubber ring 15.
The front rubber ring 14 and the rear rubber ring 15 have a disk shape that is short in the axial direction and has an outer diameter that allows loose elastic contact with the inner surface of the outer cylinder 11.
For this reason, while sealing performance with respect to a drilling fluid is ensured between the inner surfaces of the outer cylinder 11, since each rubber ring is a short disk shape, when collect | recovering the positional information transmitter 13, when the position information transmitter 13 is collect | recovered, the transmission rod 2 Even if there is a curve with a small radius, the rubber rings 14 and 15 can be easily passed by elastic deformation.
A key groove 12d is formed in a part of the digging head 12, and the key groove 12d engages with the key 11b on the inner surface of the outer cylinder 1 so that the rotation of the outer cylinder 11 can be transmitted to the digging head 12. Configure.

＜５＞流体の通路。
各ゴム環１４、１５の外径、および受圧円盤１６の外径は、外筒１１の内径とほぼ等しく構成する。
そして各ゴム環１４、１５、および受圧円盤１６の内部には端面から端面を貫通する流路１７を形成する。
位置情報発信器１３の外径は、外筒１１の内径よりも十分に小さく構成し、位置情報発信器１３の外面と外筒１１の内面との間の空間を流体の通路として利用する。
掘進頭部１２の内部にも流路１７を貫通させ、その前端は受圧傾斜面１２ｃに吐出口１２ａとして開放する。 <5> Fluid passage.
The outer diameters of the rubber rings 14 and 15 and the outer diameter of the pressure receiving disk 16 are configured to be substantially equal to the inner diameter of the outer cylinder 11.
In each rubber ring 14, 15 and the pressure receiving disk 16, a flow path 17 that penetrates from the end face to the end face is formed.
The outer diameter of the position information transmitter 13 is configured to be sufficiently smaller than the inner diameter of the outer cylinder 11, and the space between the outer surface of the position information transmitter 13 and the inner surface of the outer cylinder 11 is used as a fluid passage.
The flow path 17 is also passed through the inside of the excavation head 12, and the front end thereof opens to the pressure receiving inclined surface 12c as the discharge port 12a.

＜６＞注入ヘッド。
外筒１１の内部から掘進頭部１２などを引き抜いた後には、伝達ロッド２を含めて、地中に長い空洞が形成される。
この引き抜き後の空洞を利用して地中に高圧注入ヘッドを設置することができるが、本発明では二種類の注入ヘッド、すなわち装着型注入ヘッド３と貫通型ヘッド４とを使用することができる。
<6> Injection head.
After the excavation head 12 and the like are pulled out from the inside of the outer cylinder 11, a long cavity is formed in the ground including the transmission rod 2.
A high-pressure injection head can be installed in the ground by using the cavity after drawing, but in the present invention, two types of injection heads, that is, the mounting type injection head 3 and the penetration type head 4 can be used. .

＜７＞装着型注入ヘッド。（図３）
その注入ヘッドのひとつが図３に示す装着型注入ヘッド３である。
装着型と称するのは、掘進頭部１２などを引き抜いた後の中空の外筒１１を貫通することなく、外筒１１に後から挿入してそのまま装着するタイプの注入ヘッドだからである。
外筒１１に装着して前進が拘束されるから、外筒１１を地上側へ後退させると、一体となって後退することになる。
この装着型注入ヘッド３は、硬化剤の噴射用の貫通孔３１を開口し、後端を開放した管体よりなるノズル体である。
この装着型注入ヘッド３は、単なる管体でも二重管のように複数の筒を重ねた管体であっても使用することができる。
したがって二重管であれば噴射孔３１は２箇所に、三重管であれば３箇所に開設することになる。
装着型注入ヘッド３は、大径部３２と小径部３３とによって構成する。
大径部３２の外径は外筒１１の内径とほぼ等しく形成し、小径部３３の外径やそれよりも小さく形成する。
その結果、大径部３２と小径部３３との境界に形成された段差をストッパー３４として利用する。
このストッパー３４が前端ロッド１の外筒１１の内側の段部１１ａに当接すると、装着型注入ヘッド３はそれ以上の前進が不可能となる。
装着型注入ヘッド３の噴射孔３１の位置は、装着型注入ヘッド３が外筒１１の段部１１ａに当接して前進が阻止された場合に、噴射孔が外筒１１の前端よりも前方、すなわち地中に露出する位置に設定する。
なおストッパー３４は段差を利用した構成に限らず、装着型注入ヘッド３が前端ロッド１の内部を貫通することができない構造であれば採用することができる。
装着型注入ヘッド３の後端にはワイヤ３５を取り付け、使用後の装着型注入ヘッド３を地上へ回収することができるように構成する。
また装着型注入ヘッド３の一部にはキー溝を刻設し、外筒１１の内面に形成したキー１１ｂに嵌合して外筒１１の回転を装着型注入ヘッド３に与えることが可能であるように構成する。 <7> Wearable injection head. (Figure 3)
One of the injection heads is a wearable injection head 3 shown in FIG.
The mounting type is because it is an injection head of a type that is inserted into the outer cylinder 11 and mounted as it is without penetrating the hollow outer cylinder 11 after the excavation head 12 and the like are pulled out.
Since the forward movement is restrained by being attached to the outer cylinder 11, when the outer cylinder 11 is retracted to the ground side, it is retracted integrally.
This mounting type injection head 3 is a nozzle body made of a tubular body having a through hole 31 for injecting a hardener and an open rear end.
The mounting type injection head 3 can be used as a simple tube or a tube in which a plurality of tubes are stacked like a double tube.
Therefore, in the case of a double pipe, the injection hole 31 is opened in two places, and in the case of a triple pipe, it is opened in three places.
The wearable injection head 3 is composed of a large diameter portion 32 and a small diameter portion 33.
The outer diameter of the large diameter portion 32 is formed to be substantially equal to the inner diameter of the outer cylinder 11, and the outer diameter of the small diameter portion 33 or smaller than that.
As a result, the step formed at the boundary between the large diameter portion 32 and the small diameter portion 33 is used as the stopper 34.
When the stopper 34 comes into contact with the step portion 11a inside the outer cylinder 11 of the front end rod 1, the wearable injection head 3 cannot be further advanced.
The position of the injection hole 31 of the mounting type injection head 3 is such that, when the mounting type injection head 3 is in contact with the step portion 11a of the outer cylinder 11 and the forward movement is prevented, the injection hole is forward of the front end of the outer cylinder 11, That is, it is set to a position exposed in the ground.
The stopper 34 is not limited to a configuration using a step, and can be adopted as long as the mounting type injection head 3 cannot penetrate the inside of the front end rod 1.
A wire 35 is attached to the rear end of the wearable injection head 3 so that the wearable injection head 3 after use can be recovered to the ground.
Further, a key groove is engraved in a part of the mounting type injection head 3 and can be fitted to a key 11b formed on the inner surface of the outer cylinder 11 to give the rotation of the outer cylinder 11 to the mounting type injection head 3. Configure to be.

＜８＞貫通型ヘッド。（図６）
注入ヘッドの他のひとつが貫通型ヘッド４である。
貫通型と称するのは、外筒１１に装着するのではなく、外筒１１を貫通する構成だからである。
したがって、外筒１１を地上へ向けて後退させると、外筒１１とともに後退することがなく、外筒１１を貫通して地中に残ってしまう。
この貫通型ヘッド４も、前端を閉塞し、後端を開放した管体であり、単なる管体でも二重管のように複数の筒を重ねた管体であっても使用することができる。
貫通型ヘッド４の前方側面の一部には噴射孔４１を開口して、地上から供給する高圧液を外部に吐出できるように構成する。
したがって二重管であれば噴射孔４１は２箇所に、三重管であれば３箇所に開設することになる。
貫通型ヘッド４は外筒１１を貫通するように、その外径は外筒１１の内径よりも十分に小さく形成する。
貫通型ヘッド４の後方には高圧流体を供給する高圧ホース４２を連結する。 <8> A penetration type head. (Fig. 6)
Another one of the injection heads is a penetrating head 4.
The penetrating type is not mounted on the outer cylinder 11 but is configured to penetrate the outer cylinder 11.
Therefore, when the outer cylinder 11 is retracted toward the ground, the outer cylinder 11 does not retract together with the outer cylinder 11 and penetrates the outer cylinder 11 and remains in the ground.
This penetrating head 4 is also a tubular body with the front end closed and the rear end opened, and can be used as a simple tubular body or a tubular body in which a plurality of tubes are stacked like a double tube.
An injection hole 41 is opened in a part of the front side surface of the penetrating head 4 so that high-pressure liquid supplied from the ground can be discharged to the outside.
Therefore, the injection hole 41 is opened in two places in the case of a double pipe and in three places in the case of a triple pipe.
The penetrating head 4 is formed so that its outer diameter is sufficiently smaller than the inner diameter of the outer cylinder 11 so as to penetrate the outer cylinder 11.
A high-pressure hose 42 for supplying a high-pressure fluid is connected to the rear of the penetrating head 4.

＜９＞前端ロッド１の掘進。
次に施工方法について説明する。
地上に設置したボーリングマシン５を使用し、ガイド管５１に沿って前端ロッド１および前端ロッドに接続した伝達ロッド２を地中に挿入する。
前端ロッド１は、外筒１１内に掘進頭部１２や位置情報発信器１３を挿入して構成してある。
伝達ロッド２は、円筒状の単管ロッドを長手方向に沿って連結して構成したものである。
この伝達ロッド２の後端に地上のボーリングマシン５で回転力を与えることによって、先端の前端ロッド１に回転を与えることができる。
この伝達ロッド２の内部に高圧流体を供給すると、受圧円盤１６を後方から加圧することになり、掘進頭部１２には推進力が与えられる。
外筒１１の先端に位置した受圧傾斜面１２ｃは土圧を受けている。
そこで、受圧円盤１６が受ける前方への力を、受圧傾斜面１２ｃの受ける抵抗よりも大きく設定すれば回転力、および吐出口からの高圧流体の噴射と合わせて地盤中を前進することができる。
掘進頭部１２の受圧傾斜面１２ｃを利用し、位置情報発信器１３からの信号をもとにして直進あるいは曲線通過を行わせることは前記で説明したとおりである。
その際に、伝達ロッド２の内部を通して供給された高圧流体は、掘進頭部１２の先端の吐出口１２ａから噴射して地盤の切削、攪拌を行って前進を容易にする。
こうして掘進を続け、前端ロッド１が地盤改良の目的の位置に到達させる。
到達したら、高圧流体の供給を停止し、地上からワイヤ１８を巻き上げて外筒１１中の位置情報発信器１３、掘進頭部１２を地上に回収し、外筒１１と伝達ロッド２を地中に残しておく。 <9> Digging of the front end rod 1.
Next, the construction method will be described.
Using the boring machine 5 installed on the ground, along the guide tube 51, the front end rod 1 and the transmission rod 2 connected to the front end rod are inserted into the ground.
The front end rod 1 is configured by inserting an excavation head 12 and a position information transmitter 13 into an outer cylinder 11.
The transmission rod 2 is configured by connecting cylindrical single tube rods along the longitudinal direction.
By applying a rotational force to the rear end of the transmission rod 2 by the ground boring machine 5, the front end rod 1 at the tip can be rotated.
When a high pressure fluid is supplied to the inside of the transmission rod 2, the pressure receiving disk 16 is pressurized from behind, and a propulsive force is given to the excavation head 12.
The pressure-receiving inclined surface 12c located at the tip of the outer cylinder 11 is subjected to earth pressure.
Accordingly, if the forward force received by the pressure receiving disk 16 is set to be larger than the resistance received by the pressure receiving inclined surface 12c, it is possible to move forward in the ground together with the rotational force and the injection of the high-pressure fluid from the discharge port.
As described above, the pressure receiving inclined surface 12c of the excavation head 12 is used to cause the vehicle to go straight or pass through a curve based on a signal from the position information transmitter 13.
At that time, the high-pressure fluid supplied through the inside of the transmission rod 2 is jetted from the discharge port 12a at the tip of the excavation head 12 to cut and agitate the ground to facilitate advancement.
Thus, the excavation is continued and the front end rod 1 reaches the target position for ground improvement.
When it reaches, the supply of the high-pressure fluid is stopped, the wire 18 is wound up from the ground, the position information transmitter 13 in the outer cylinder 11 and the excavation head 12 are collected on the ground, and the outer cylinder 11 and the transmission rod 2 are brought into the ground. Leave it.

＜１０＞装着型注入ヘッド３の挿入、噴射。
前端ロッド１の外筒１１から掘進頭部１２などを引き上げて回収しても、外筒１１も伝達ロッド２も地中に残っており、連続する空洞として地中に位置している。
この引き上げ後の空洞を利用して高圧噴射筒を挿入する。
高圧噴射筒のひとつとして、装着型注入ヘッド３を空洞の挿入する場合について説明する。
装着型注入ヘッド３を伝達ロッド２内の空洞に挿入し、地上から加圧流体を供給すると、その装着型注入ヘッド３の後端の受圧面３６が流体の圧力を受けて伝達ロッド２内を前進し、やがて前端ロッド１の外筒１１内に到着し、外筒１１内へ外周を密着した状態で挿入される。（図４）
装着型注入ヘッド３が外筒１１内に到達したら、外筒１１を後方へ引き戻すと、外筒１１の係合段１１ａが装着型注入ヘッド３のストッパーに係合する。（図５）
前記したように装着型注入ヘッド３と外筒１１が係合した状態で、噴射孔３１は外筒１１の前方に露出する寸法に形成してある。
その状態で装着型注入ヘッド３に、伝達ロッド２を通して硬化剤などの溶液を高圧で供給すれば、先端の噴射孔３１から地中に噴射することができ、外筒１１を残しておいた周辺の地盤を円柱状に改良することができる。
一箇所での噴射が終了したら、伝達ロッド２を介して前端ロッド１を後退させる。
すると前端ロッド１の後退によって装着型注入ヘッド３も後退し、次の改良位置に至る。
そこで同様に硬化剤などの噴射を行う。
<10> Insertion and injection of the mounting type injection head 3.
Even if the excavation head 12 is pulled up and recovered from the outer cylinder 11 of the front end rod 1, both the outer cylinder 11 and the transmission rod 2 remain in the ground, and are located in the ground as continuous cavities.
The high pressure injection cylinder is inserted using the cavity after the pulling.
The case where the wearable injection head 3 is inserted into a cavity as one of the high pressure injection cylinders will be described.
When the wearable injection head 3 is inserted into the cavity in the transmission rod 2 and pressurized fluid is supplied from the ground, the pressure receiving surface 36 at the rear end of the wearable injection head 3 receives the pressure of the fluid and passes through the transmission rod 2. It moves forward and eventually arrives in the outer cylinder 11 of the front end rod 1 and is inserted into the outer cylinder 11 with the outer periphery closely attached. (Fig. 4)
When the mounting type injection head 3 reaches the outer cylinder 11, when the outer cylinder 11 is pulled back, the engagement step 11 a of the outer cylinder 11 is engaged with the stopper of the mounting type injection head 3. (Fig. 5)
As described above, the injection hole 31 is formed so as to be exposed to the front of the outer cylinder 11 in a state where the mounting type injection head 3 and the outer cylinder 11 are engaged.
In this state, if a solution such as a curing agent is supplied to the wearable injection head 3 through the transmission rod 2 at a high pressure, it can be injected into the ground from the injection hole 31 at the tip, and the periphery where the outer cylinder 11 is left. The ground can be improved to a cylindrical shape.
When the injection at one place is completed, the front end rod 1 is moved backward via the transmission rod 2.
Then, the wearable injection head 3 is also retracted by the retraction of the front end rod 1, and reaches the next improved position.
Therefore, a curing agent or the like is sprayed in the same manner.

＜１１＞貫通型ヘッド４の挿入、噴射。
次に高圧噴射筒のひとつとして、貫通型ヘッド４を空洞の挿入する場合について説明する。
貫通型ヘッド４を伝達ロッド２内の空洞に挿入し、後方に高圧ホース４２を取り付け、地上からホース４２内に加圧流体を供給する。
すると貫通型ヘッド４とホース４２は流体の圧力を受けて伝達ロッド２内を前進してゆき、やがて前端ロッド１の外筒１１内に到着する。
そして、外筒１１内へ外周に余裕を残した状態で挿入される。（図７）
貫通型ヘッド４が外筒１１内に到達したら、伝達ロッド２を介して外筒１１を後方へ引き戻す。（図８）
すると、外筒１１と貫通型ヘッド４は係合していないから、伝達ロッド２とともに外筒１１だけが地上に向けて後退し、貫通型ヘッド４は地中に残ることになる。（図９）
その状態で高圧ホース４２から貫通型ヘッド４に硬化剤を供給し、その噴射孔４１から地中に噴射して周辺の地盤を改良することができる。
一箇所での噴射が終了したら、高圧ホース４２を介して貫通型ヘッド４を後退させ、次の改良位置で同様に硬化剤などの噴射を行う。
こうして、必要とする位置の地盤を改良することができる。
<11> Insertion and ejection of the penetrating head 4.
Next, the case where the penetration type head 4 is inserted into the cavity as one of the high pressure injection cylinders will be described.
The penetrating head 4 is inserted into the cavity in the transmission rod 2, a high-pressure hose 42 is attached to the rear, and pressurized fluid is supplied into the hose 42 from the ground.
Then, the penetrating head 4 and the hose 42 are moved forward in the transmission rod 2 under the pressure of the fluid, and eventually arrive in the outer cylinder 11 of the front end rod 1.
And it inserts in the outer cylinder 11 in the state which left the margin on the outer periphery. (Fig. 7)
When the penetrating head 4 reaches the inside of the outer cylinder 11, the outer cylinder 11 is pulled back via the transmission rod 2. (Fig. 8)
Then, since the outer cylinder 11 and the penetrating head 4 are not engaged, only the outer cylinder 11 moves backward together with the transmission rod 2 toward the ground, and the penetrating head 4 remains in the ground. (Fig. 9)
In this state, a hardening agent can be supplied from the high-pressure hose 42 to the penetrating head 4 and injected into the ground through the injection hole 41 to improve the surrounding ground.
When the injection at one place is completed, the penetrating head 4 is retracted through the high-pressure hose 42 and the curing agent or the like is similarly injected at the next improvement position.
Thus, the ground at the required position can be improved.

本発明の前端ロッドの一実施形態の分解説明図。The exploded explanatory view of one embodiment of the front end rod of the present invention. 自在ボーリングの施工状態の説明図および前端ロッドの断面図。Explanatory drawing of the construction state of free boring and sectional drawing of a front end rod. 装着型注入ヘッドの説明図。Explanatory drawing of a mounting | wearing type injection head. 装着型注入ヘッドを外筒内へ挿入した状態の説明図。Explanatory drawing of the state which inserted the mounting | wearing type injection head into the outer cylinder. 装着型注入ヘッドが外筒の前端から露出して硬化剤を噴射している状態の説明図。Explanatory drawing of the state which the mounting | wearing type injection | pouring head is exposed from the front end of an outer cylinder, and is injecting the hardening | curing agent. 貫通型ヘッドの説明図。Explanatory drawing of a penetration type head. 貫通型ヘッドが外筒内へ挿入した状態の説明図。Explanatory drawing of the state which the penetration type head inserted in the outer cylinder. 貫通型ヘッドが外筒の前端から露出して硬化剤を噴射している状態の説明図。Explanatory drawing of the state which the penetration type head is exposed from the front end of an outer cylinder, and is injecting the hardening | curing agent. 貫通型ヘッドのみが地中に残って地中に硬化剤を噴射している状態の説明図。Explanatory drawing of the state which only the penetration type head remains in the ground and injects the hardening | curing agent in the ground.

符号の説明Explanation of symbols

１：前端ロッド
１１：外筒
１２：掘進頭部
１３：位置情報発信機
１６：受圧円盤
２：伝達ロッド
３：装着型注入ヘッド
４：貫通型ヘッド 1: front end rod 11: outer cylinder 12: excavation head 13: position information transmitter 16: pressure receiving disk 2: transmission rod 3: mounting type injection head 4: penetrating type head

Claims (3)

円筒状のロッドを長手方向に沿って連結した伝達ロッドと、
伝達ロッドの先端に取り付けた円筒状の前端ロッドと、
この前端ロッドの内部にスライド自在に収納した掘進頭部および位置情報発信器と、
掘進頭部と位置情報発信器を回収後に、その回収跡の空洞に挿入するための高圧噴射筒とより構成し、
この高圧噴射筒を通して地中へ高圧で硬化剤を噴射することを特徴とする地盤改良装置。 A transmission rod that connects cylindrical rods along the longitudinal direction;
A cylindrical front end rod attached to the tip of the transmission rod;
An excavation head and a position information transmitter slidably housed inside the front end rod,
After collecting the excavation head and the position information transmitter, it consists of a high-pressure injection cylinder to be inserted into the cavity of the collection trace,
A ground improvement device that injects a curing agent at high pressure into the ground through the high-pressure injection cylinder. 高圧噴射筒は、
地中に残した前端ロッドの内部を貫通することができないストッパー部を形成したノズル体である、
請求項１記載の地盤改良装置。 High pressure injection cylinder
It is a nozzle body formed with a stopper part that cannot penetrate the inside of the front end rod left in the ground,
The ground improvement device according to claim 1. 高圧噴射筒は、
地中に残した前端ロッドの内径よりも小さい外径を備え、
前端ロッドの内部を貫通することができるノズル体である、
請求項１記載の地盤改良装置。 High pressure injection cylinder
It has an outer diameter smaller than the inner diameter of the front end rod left in the ground,
It is a nozzle body that can penetrate the inside of the front end rod,
The ground improvement device according to claim 1.
JP2006205121A 2006-07-27 2006-07-27 Ground improvement device. Expired - Fee Related JP4913494B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001164548A (en) * 1999-12-08 2001-06-19 Chem Grouting Co Ltd Chemical grouting method
JP2004100288A (en) * 2002-09-10 2004-04-02 Kajima Corp Method for measuring direction of horizontal drillhole
JP2004176493A (en) * 2002-11-29 2004-06-24 Kozo Koji Kk High pressure injection pipe
JP2005155209A (en) * 2003-11-26 2005-06-16 Taisei Corp Universal excavator and ground improvement method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001164548A (en) * 1999-12-08 2001-06-19 Chem Grouting Co Ltd Chemical grouting method
JP2004100288A (en) * 2002-09-10 2004-04-02 Kajima Corp Method for measuring direction of horizontal drillhole
JP2004176493A (en) * 2002-11-29 2004-06-24 Kozo Koji Kk High pressure injection pipe
JP2005155209A (en) * 2003-11-26 2005-06-16 Taisei Corp Universal excavator and ground improvement method

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