JP3961510B2

JP3961510B2 - Ground injection method

Info

Publication number: JP3961510B2
Application number: JP2004187694A
Authority: JP
Inventors: 俊介島田
Original assignee: 強化土エンジニヤリング株式会社
Priority date: 2004-06-25
Filing date: 2004-06-25
Publication date: 2007-08-22
Anticipated expiration: 2024-06-25
Also published as: JP2006009401A

Description

本発明は軟弱地盤、漏水地盤等、液状化の恐れのある地盤、汚染地盤などの地盤注入工法に係り、特に、地盤注入を施し難い既設構造物下方の支持地盤、廃棄物処理場の底盤あるいは溜め池や貯水池下方等の地盤注入工法に係り、詳細には、地盤注入を施し難い既設構造物下方の支持地盤を急速かつ確実に、かつ経済的に地盤注入し、地盤沈下や、地震時における地盤の液状化を未然に防止し得、さらに廃棄物処理場からの有害物質の溶出を防止し得、さらに溜め池や貯水池からの漏水を防止し得る地盤注入方法に関する。 The present invention relates to ground injection methods such as soft ground, leaky ground, ground that may be liquefied, contaminated ground, etc., in particular, support ground under existing structures that are difficult to perform ground injection, bottom of waste disposal site or In particular, it is related to ground injection methods such as below reservoirs and reservoirs, and more specifically, the support ground under existing structures where it is difficult to inject ground can be injected quickly, reliably and economically. The present invention relates to a ground injection method capable of preventing liquefaction of the ground in advance, further preventing elution of harmful substances from a waste disposal site, and further preventing leakage from a reservoir or a reservoir.

建造物基礎の液状化対策工では、従来、建造物基礎下に水平方向にボーリングして複数の吐出口を有する注入外管を設置し、さらにその外管内に注入内管を挿入して外管吐出口から順次に地盤中に注入液を注入して地盤を固結する方法が用いられている。 In liquefaction countermeasures for building foundations, conventionally, an outer injection pipe having a plurality of discharge ports by boring in the horizontal direction is installed under the building foundation, and the outer injection pipe is inserted into the outer pipe. A method of injecting an injection solution into the ground sequentially from the discharge port and solidifying the ground is used.

液状化防止工は大容量土の地盤改良であるため、経済的に、かつ確実に地盤改良を行う必要がある。このためには、注入は低吐出速度で土粒子間浸透を行わなければならない。この場合、地盤改良に長い時間を要し、かつ工期が長くなり、このため、工事費が高くなる。これを防ぐためには複数の吐出口から同時注入することにより、一つの吐出口からは低吐出速度で注入しながら、全体的には大吐出速度での注入を可能にして経済性の向上を計ることが考えられる。 Since the liquefaction prevention work is a ground improvement for large-capacity soil, it is necessary to economically and reliably improve the ground. For this purpose, the injection must be performed between soil particles at a low discharge rate. In this case, it takes a long time to improve the ground, and the construction period becomes longer, which increases the construction cost. In order to prevent this, by simultaneously injecting from a plurality of outlets, it is possible to inject at a high discharge speed as a whole while injecting from one outlet at a low discharge speed to improve economic efficiency. It is possible.

しかし、水平方向に注入外管を設置すると、上部からの土圧によって注入外管は断面が変形しやすく、かつ注入管の軸方向にも変形しやすくなり、注入内管の挿入移動が困難になる。特に内管の軸方向に複数の吐出口を設ける場合には、内管先端の注入部が長くなり、外管の変形による影響をうけやすくなるという問題があった。
特開平２００３−３４６８８５号公報特開平２００３−２６１９３４号公報 However, if the outer injection pipe is installed in the horizontal direction, the cross section of the outer injection pipe is easily deformed by the earth pressure from above, and the axial direction of the injection pipe is also easily deformed, making it difficult to insert and move the inner injection pipe. Become. In particular, when a plurality of discharge ports are provided in the axial direction of the inner tube, there is a problem that the injection portion at the tip of the inner tube becomes long and is easily affected by the deformation of the outer tube.
Japanese Patent Application Laid-Open No. 2003-346885 Japanese Patent Laid-Open No. 2003-261934

本発明者は建造物基礎の液状化対策工のように建造物基礎地盤を水平方向に改良する地盤注入工法において、注入管の変形の問題を解決し、注入液を複数の選定した注入管吐出口から同時に、かつ各吐出口における注入状況に応じて最適の注入浸透を可能とし、これにより、所定位置に所定形状の固結体を経済的に、かつ確実に形成することを見い出し、本発明を完成するに至った。 The present inventor solves the problem of deformation of the injection pipe in the ground injection method for improving the foundation foundation ground in the horizontal direction, such as the liquefaction countermeasure work for the building foundation, and discharges the injection liquid to a plurality of selected injection pipes. It has been found that it is possible to perform optimal injection penetration at the same time from the outlet and in accordance with the injection situation at each discharge port, thereby forming a predetermined-shaped solid body economically and reliably at a predetermined position. It came to complete.

そこで、本発明の目的は建造物下方の地盤を固結する液状化対策のための注入のように、特に水平方向に設置した注入管からの注入で一定の形状に、急速に固結することを可能にしたものであって、注入液を選定した複数の注入ポイントに設置した外管吐出口から同時に注入することにより、所定の位置に、所定の形状に、均質な浸透固結を可能にし、かつ広範囲な地盤改良を短期間に施工し得、上述の公知技術に存する欠点を改良した地盤注入工法を提供することにある。 Therefore, the object of the present invention is to rapidly consolidate into a certain shape by injecting from an infusion tube installed in a horizontal direction, such as infusion for liquefaction measures to consolidate the ground below the building. By simultaneously injecting the injection solution from the outer tube outlets installed at a plurality of selected injection points, it is possible to achieve uniform infiltration and consolidation at a predetermined position and in a predetermined shape. In addition, an object of the present invention is to provide a ground injection method that can be applied in a short period of time and can improve the shortcomings of the above-mentioned known techniques.

上述の本発明の目的を達成するため、本発明によれば、改良すべき地盤の近傍地表面から地盤中に屈曲して、または屈曲と直線を任意に組み合わせてボーリングし、得られたボーリング孔中に、逆止弁を備えた複数の外管吐出口を有する外管を設置し、この外管内に、外側長手方向に三個以上の膨縮パッカを間隔をあけて設けて互いに隣接する膨縮パッカ間を吐出位置とし、かつ、内管吐出口が別々の吐出位置に位置する注入液流路と、膨縮パッカに流体を送って膨張させ、あるいは排出して収縮させるパッカ流路とをそれぞれ内部に独立して形成された内管を移動自在に挿入し、前記吐出位置を外管吐出口に合致させた後、パッカ流路を通して前記三個以上の膨縮パッカに流体を送って該膨縮パッカを膨張させ、これにより互いに隣接する膨縮パッカによって挟まれるすき間に管内空間を形成し、内管吐出口から注入液を管内空間および外管吐出口を経て地盤に注入することを特徴とする。 In order to achieve the above-mentioned object of the present invention, according to the present invention, a boring hole obtained by bending into the ground from the vicinity of the ground to be improved or by arbitrarily combining bending and straight lines is obtained. An outer tube having a plurality of outer tube discharge ports equipped with check valves is installed therein, and three or more expansion / contraction packers are provided in the outer tube at intervals in the longitudinal direction of the outer tube, and are adjacent to each other. An infusate flow path in which the space between the contraction packers is a discharge position and the inner tube discharge port is located at a separate discharge position, and a packer flow path that is inflated by sending a fluid to the expansion / contraction packer or contracting by discharge Each of the inner pipes independently formed inside is movably inserted, and after the discharge position is matched with the outer pipe discharge port, a fluid is sent to the three or more expansion / contraction packers through a packer channel. Inflating the expansion / contraction packer, thereby adjoining each other The tube space is formed in the gap sandwiched by condensation packer, the injectate from the inner tube the discharge port via the pipe space and the outer tube discharge port, characterized in that injecting the ground.

さらに、上述の目的を達成するため、本発明によれば、改良すべき地盤の近傍地表面から地盤中に屈曲して、または屈曲と直線を任意に組み合わせてボーリングし、得られたボーリング孔中に、外側長手方向に三個以上の外管パッカを間隔をあけてはめ込み、かつ互いに隣接する外管パッカ間に外管吐出口を有する外管を設置し、この外管内に、外側長手方向に三個以上の膨縮パッカを間隔をあけて設けて互いに隣接する膨縮パッカ間を吐出位置とし、この吐出位置に内管吐出口が位置する注入液流路と、膨縮パッカに流体を送って膨張させ、あるいは排出して収縮させるパッカ流路とをそれぞれ内部に独立して形成した内管を移動自在に挿入し、前記三個以上の膨縮パッカに流体を送って該膨縮パッカを膨張させた後、次いで外管パッカ間の外管吐出口から注入液流路の内管吐出口を通して地盤中に注入液を注入することを特徴とする。 Furthermore, in order to achieve the above-described object, according to the present invention, the boring hole obtained by bending into the ground from the ground surface near the ground to be improved or by arbitrarily combining the bending and the straight line is obtained. In the outer longitudinal direction, three or more outer pipe packers are fitted with a space therebetween, and an outer pipe having an outer pipe discharge port is installed between adjacent outer pipe packers. Three or more expansion / contraction packers are provided at an interval, and a discharge position is defined between adjacent expansion / contraction packers, and fluid is sent to the injection liquid flow path where the inner tube discharge port is located at this discharge position and the expansion / contraction packer. The inner tube formed independently of each other with the packer flow path to be expanded or discharged and contracted is movably inserted, and a fluid is sent to the three or more expansion / contraction packers to remove the expansion / contraction packers. After inflating, then between outer tube packers Characterized by injecting an infusion liquid into the ground from the outer tube discharge opening through the inner tube outlet of injection liquid flow path.

さらに、上述の目的を達成するため、本発明によれば、改良すべき地盤の近傍地表面から地盤中に屈曲して、または屈曲と直線を任意に組み合わせて複数本ボーリングし、得られた各ボーリング孔中に、逆止弁を備えた複数の外管吐出口を有する外管を設置し、この外管内に、外側長手方向に三個以上の膨縮パッカを間隔をあけて設けて互いに隣接する膨縮パッカ間を吐出位置とし、かつ、内管吐出口が別々の吐出位置に位置する複数の注入液流路と、膨縮パッカに流体を送って膨張させ、あるいは排出して収縮させるパッカ流路とをそれぞれ内部に独立して形成された内管を移動自在に挿入し、前記吐出位置を外管吐出口に合致させた後、パッカ流路を通して前記三個以上の膨縮パッカに流体を送って該膨縮パッカを膨張させ、これにより互いに隣接する膨縮パッカによって挟まれるすき間に管内空間を形成し、注入液を内管吐出口を通して注入液送液装置から管内空間および外管吐出口を経て地盤に注入することを特徴とし、前記注入液送液装置が制御部と、注入液槽と、この注入液槽に連結され、注入液を加圧、送液する注入液加圧部と、加圧された注入液を地盤中における各注入管に送り出す送液管とを備え、前記注入液加圧部および送液管は制御部に接続され、制御部の制御のもとに注入液を前記複数の外管吐出口から地盤中に同時注入することを特徴とする。 Furthermore, in order to achieve the above-described object, according to the present invention, a plurality of bores obtained by bending into the ground from the vicinity of the ground to be improved, or by arbitrarily combining bending and straight lines, are obtained. An outer tube having a plurality of outer tube discharge ports equipped with check valves is installed in the bore hole, and three or more expansion / contraction packers are provided in the outer tube in the longitudinal direction at intervals, adjacent to each other. A plurality of infusion flow paths in which the expansion / contraction packer is a discharge position and the inner tube discharge port is positioned at a separate discharge position, and a packer that sends the fluid to the expansion / contraction packer for expansion or discharge and contraction An inner pipe formed independently of each of the flow paths is movably inserted, and the discharge position is matched with the outer pipe discharge port, and then the fluid is passed through the packer flow path to the three or more expansion / contraction packers. To expand the expansion / contraction packer, Forming a space in the pipe between the adjacent expansion and contraction packers, and injecting the injection liquid from the injection liquid feeding device through the inner pipe discharge port to the ground through the pipe internal space and the outer pipe discharge port, The injection liquid feeding device is connected to the control unit, the injection liquid tank, the injection liquid tank, pressurizing and feeding the injection liquid, an injection liquid pressurizing part, and the pressurized injection liquid in the ground A liquid feeding pipe for feeding to each injection pipe, the injection liquid pressurizing section and the liquid feeding pipe are connected to a control section, and under the control of the control section, the injection liquid is ground into the ground from the plurality of outer pipe discharge ports. It is characterized by being injected simultaneously.

上述の外管は次の（ａ）、（ｂ）または（ｃ）の工程によって地盤中に設置される。 The above outer pipe is installed in the ground by the following step (a), (b) or (c).

（ａ）ドリルヘッドを先端に装着したボーリングロッドをケーシング中に挿入し、ドリルヘッドを回転しながら改良すべき地盤の近傍地表面から地盤中に屈曲して、または屈曲と直線を組み合わせて押し込んでボーリングし、ボーリング孔が所定の位置に達したのち、ボーリングロッドを引き抜き、残ったケーシング中に逆止弁を備えた複数の外管吐出口を有する外管を挿入してケーシングを引き抜き、外管を地盤中に設置する。 (A) Insert a boring rod fitted with a drill head at the tip into the casing, and bend into the ground from the ground surface near the ground to be improved while rotating the drill head, or push in a combination of bending and straight lines. After boring and the boring hole reaches a predetermined position, pull out the boring rod, insert the outer pipe having a plurality of outer pipe discharge ports with check valves into the remaining casing, pull out the casing, and Is installed in the ground.

（ｂ）改良すべき地盤の近傍地表面から、ケーシングを回転しながら地盤中に押し込み、屈曲して、または屈曲と直線を任意に組み合わせてボーリングし、得られたボーリング孔のケーシング中に、逆止弁を備えた複数の外管吐出口を有する外管を挿入してケーシングを引き抜き、外管を地盤に設置する。 (B) From the ground surface in the vicinity of the ground to be improved, push the casing into the ground while rotating the casing, bend it, or drill it in any combination of bending and straight lines. An outer pipe having a plurality of outer pipe discharge ports provided with stop valves is inserted, the casing is pulled out, and the outer pipe is installed on the ground.

（ｃ）改良すべき地盤の近傍地表面から地盤中にドリルヘッドを先端に装着したボーリングロッドを外管中に挿入し、ドリルヘッドを回転しながら屈曲して、または屈曲と直線を任意に組み合わせてボーリングロッドとともに押し込んでボーリングし、ボーリング孔が所定の位置に達したのち、ボーリングロッドを引き抜いて外管を地盤に設置する。 (C) Insert a boring rod with a drill head attached to the tip from the ground surface near the ground to be improved into the outer tube and bend while rotating the drill head, or any combination of bending and straight lines Then, push it with the boring rod and boring, and after the boring hole reaches a predetermined position, pull out the boring rod and install the outer tube on the ground.

本発明にかかる地盤注入工法は改良すべき地盤に屈曲して、または屈曲と直線を任意に組み合わせてボーリングし、得られたボーリング孔中に、複数の外管吐出口を有する外管を設置し、この外管内に、外側長手方向に三個以上の膨縮パッカを間隔をあけてはめ込んで互いに隣接する膨縮パッカ間を噴出位置とし、かつ、内管吐出口が別々の吐出位置に位置する注入液流路と、膨縮パッカに流体を送って膨張させ、あるいは排出して収縮させるパッカ流路とをそれぞれ内部に独立して形成された内管を移動自在に挿入し、これにより吐出口から注入液を地盤に注入するようにしたから、地盤注入を施し難い既設構造物下方の支持地盤を急速かつ確実に、かつ経済的に地盤注入し、地盤沈下や、地震時における地盤の液状化を未然に防止し得、さらに廃棄物処理場からの有害物質の溶出を防止し得、さらに溜め池や貯水池からの漏水を防止し得る。 The ground injection method according to the present invention is to bend to the ground to be improved, or to bend by arbitrarily combining bending and straight lines, and an outer pipe having a plurality of outer pipe discharge ports is installed in the obtained borehole. In this outer tube, three or more expansion / contraction packers are fitted in the outer longitudinal direction with an interval between them, and the expansion / contraction packer adjacent to each other is set as a discharge position, and the inner tube discharge port is positioned at a separate discharge position. An inner pipe formed independently of the injection liquid flow path and the packer flow path for inflating the fluid by sending it to the expansion / contraction packer or discharging and contracting it is movably inserted therein, thereby the discharge port Since the injection solution is injected into the ground from the ground, the support ground under the existing structure, which is difficult to be injected into the ground, is quickly and reliably and economically injected into the ground, resulting in ground subsidence and liquefaction of the ground during an earthquake. Can be prevented in advance, Et to obtain preventing elution of hazardous substances from waste sites may prevent water leakage from the addition pond and reservoirs.

以下、本発明を添付図面を用いて詳述する。図１は地盤中に挿入された本発明にかかる注入管の外管および内管を表した部分断面図である。図２は図１に示される注入管の実際の施工に使用される注入管の断面図である。図３は外管パッカを三個以上有する外管を地盤中に設置した状態の断面図である。図４は図３の外管に本発明にかかる内管を挿入した状態の断面図である。図５は構造物直下の改良すべき地盤処理の基本模式図である。図６は構造物直下の改良すべき地盤処理の基本模式図である。 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a partial sectional view showing an outer tube and an inner tube of an injection tube according to the present invention inserted into the ground. FIG. 2 is a cross-sectional view of the injection tube used in the actual construction of the injection tube shown in FIG. FIG. 3 is a cross-sectional view of an outer tube having three or more outer tube packers installed in the ground. 4 is a cross-sectional view of the outer tube of FIG. 3 with the inner tube according to the present invention inserted therein. FIG. 5 is a basic schematic diagram of the ground treatment to be improved directly under the structure. FIG. 6 is a basic schematic diagram of the ground treatment to be improved directly under the structure.

まず、図５に示されるように、ビル、廃棄物処理場、溜め池、貯水池等、移動不可能な構造物２１の直下の改良すべき地盤１ａの近傍地表面２から地盤１中に屈曲して、または屈曲と直線を組み合わせて、例えば、図５では最初に斜めに屈曲して、続いて構造物２１の直下の改良すべき地盤１ａに直線状に、さらに続いて、斜めに屈曲して、対向側の近傍地表面２まで削孔し、ボーリング孔３を形成する。 First, as shown in FIG. 5, the ground 1 is bent from the ground surface 2 near the ground 1a to be improved directly under the immovable structure 21 such as a building, a waste disposal site, a reservoir, a reservoir, or the like. Or a combination of a bend and a straight line, for example, in FIG. 5, first bend obliquely, then straight to the ground 1a to be improved immediately below the structure 21, and then bend obliquely. Then, a hole is drilled to the near ground surface 2 on the opposite side to form a boring hole 3.

図６は、従来の垂直削孔２２ならびに斜め直線状の斜め削孔２３と、曲線状（屈曲）ボーリング孔３とを併用した例である。この方法では、従来の技術にさらに本発明のボーリング孔３を併用するので、改良すべき地盤１ａは一層確実かつ迅速に固結され、固結領域２４を形成する。 FIG. 6 shows an example in which a conventional vertical hole 22 and an oblique straight hole 23 are used together with a curved (bent) boring hole 3. In this method, since the boring hole 3 of the present invention is further used in combination with the conventional technique, the ground 1a to be improved is consolidated more reliably and rapidly to form a consolidated region 24.

本発明はこのようにして得られたボーリング孔３中に図１に示されるように外管７を設置し、この外管７内に内管１３を移動自在に挿入して注入管Ａを地盤１中に形成する。外管７は逆止弁としてゴムスリーブ４を備えた複数の外管吐出口５を有して構成される。また、内管１３は外側長手方向に三個以上の膨縮パッカ８を間隔をあけてはめ込んで、互いに隣接する膨縮パッカ８、８間を吐出位置９とし、かつ、内管吐出口１０と別々の吐出位置９に位置する注入液流路１１と、膨縮パッカ８に流体を出入口１２ａを通して送って膨張させ、あるいは排出して収縮させるパッカ流路１２とをそれぞれ内部に独立して形成することにより構成される。 In the present invention, the outer tube 7 is installed in the bore hole 3 thus obtained as shown in FIG. 1, and the inner tube 13 is movably inserted into the outer tube 7 to insert the injection tube A into the ground. 1 to form. The outer tube 7 has a plurality of outer tube discharge ports 5 each having a rubber sleeve 4 as a check valve. Further, the inner tube 13 is fitted with three or more expansion / contraction packers 8 in the outer longitudinal direction with an interval between them, and a space between the expansion / contraction packers 8, 8 adjacent to each other is set as a discharge position 9. An infusate flow path 11 located at different discharge positions 9 and a packer flow path 12 for inflating the fluid through the inlet / outlet port 12a to the expansion / contraction packer 8 or discharging and contracting are formed independently inside. It is constituted by.

上述の構成からなる注入管Ａは吐出位置９を外管吐出口５に合致させた後、パッカ流路１２を通して三個以上の膨縮パッカ８に水、空気等の流体を出入口１２ａから送って膨縮パッカ８を膨張させ、これにより互いに隣接する膨縮パッカ８によって挟まれるすき間１４に管内空間１５を形成し、内管吐出口１０から注入液を管内空間１５および外管吐出口５を経て地盤１中に注入する。なお、注入液は自動制御の注入液送液装置Ｘを用い、注入液槽３５からポンプ３６、３６を経て内管１３の注入液流路１１に送液される。Ｆは流量計、Ｐは圧力計である。注入液送液装置Ｘについては後述する。 The injection pipe A having the above-described configuration sends the fluid such as water and air from the inlet / outlet port 12a to the three or more expansion / contraction packers 8 through the packer channel 12 after the discharge position 9 is matched with the outer pipe discharge port 5. The expansion / contraction packer 8 is inflated, thereby forming a pipe inner space 15 in a gap 14 sandwiched between the expansion / contraction packers 8 adjacent to each other, and an injecting liquid is passed from the inner pipe discharge port 10 through the pipe inner space 15 and the outer pipe discharge port 5. Inject into the ground 1. The injection solution is sent from the injection solution tank 35 to the injection solution channel 11 of the inner tube 13 through the pumps 36 and 36 using the automatically controlled injection solution delivery device X. F is a flow meter and P is a pressure gauge. The injection liquid feeding device X will be described later.

上述の注入管Ａは次いで、膨縮パッカ８から流体を排出して膨縮パッカ８を収縮し、内管１３を移動して吐出位置９を他の外管吐出口５に合致させ、注入ステージを移動の後、膨縮パッカ８を膨張させて管内空間１５を形成し、上述と同様にして繰り返し注入液を地盤１中に注入し続ける。 Next, the above-described injection tube A discharges the fluid from the expansion / contraction packer 8 to contract the expansion / contraction packer 8, moves the inner tube 13 to match the discharge position 9 with the other outer tube discharge port 5, and the injection stage. After the movement, the expansion / contraction packer 8 is expanded to form a space 15 in the pipe, and the injection solution is repeatedly injected into the ground 1 in the same manner as described above.

なお、上述の注入管Ａは外管７の外壁６と削孔壁１６との間の空間１７にシールグラウト１８を填充し、注入液をシールグラウト１８を破って地盤１中に注入することもできる。また、内管１３の少なくとも先端部分１３ａは金属、硬質プラスチック等の硬質材料で、かつ一体化して形成される。しかも、この一体化された先端部分１３ａはホース等の撓み部材１９によって部分的に形成される。本発明にかかる注入管Ａは地盤１中で横方向に挿入されるため、上方からの土圧により内管１３に変形が生じることもある。この場合でも、内管１３の先端部分１３ａは硬質材料で一体化して形成され、しかも部分的に撓み部材１９によって形成されるため、注入液流路１１およびパッカ流路１２はいずれも変形に追従し、円滑に注入に供することができる。 The above-mentioned injection pipe A may fill the space 17 between the outer wall 6 of the outer pipe 7 and the drilling wall 16 with the seal grout 18 and inject the injected liquid into the ground 1 by breaking the seal grout 18. it can. Further, at least the tip portion 13a of the inner tube 13 is made of a hard material such as metal or hard plastic and is integrally formed. Moreover, the integrated tip portion 13a is partially formed by a bending member 19 such as a hose. Since the injection pipe A according to the present invention is inserted laterally in the ground 1, the inner pipe 13 may be deformed by earth pressure from above. Even in this case, since the distal end portion 13a of the inner tube 13 is integrally formed of a hard material and is partially formed by the bending member 19, both the injection liquid channel 11 and the packer channel 12 follow deformation. And can be smoothly used for injection.

図２は図１に示される注入管の現場で現実に使用される実際の注入管を表した断面図であって、特に先端部分１３ａがゴム管等の撓み部材１９によって連結される。この注入管の場合も、図１と同様、注入液は自動制御の注入液送液装置Ｘを用い、注入液槽３５からポンプ３６を経て内管１３の注入液流路１１に送液される。 FIG. 2 is a cross-sectional view showing an actual injection tube actually used at the site of the injection tube shown in FIG. 1, and in particular, the distal end portion 13 a is connected by a flexible member 19 such as a rubber tube. In the case of this injection tube, as in FIG. 1, the injection solution is sent from the injection solution tank 35 to the injection solution channel 11 of the inner tube 13 via the pump 36 using the automatically controlled injection solution delivery device X. .

図３は外管パッカ２０を三個以上有する外管７を地盤１中に設置した状態の断面図である。この外管７の設置はまず、ボーリング孔３を削孔の後、図示しないが、外管パッカ２０を膨張させない状態で外管７をボーリング孔３中に挿入する。次いで、図示しないが、外管パッカ２０中に水、空気等の流体を導入して膨張させ、外管パッカ２０を形成するための内管を外管７に挿入して図３に示されるように、外管７を地盤１のボーリング孔３中に設置する。外管７の外管パッカ２０、２０間には外管吐出口５が設けられる。 FIG. 3 is a cross-sectional view of a state in which the outer tube 7 having three or more outer tube packers 20 is installed in the ground 1. For the installation of the outer tube 7, first, after drilling the boring hole 3, the outer tube 7 is inserted into the boring hole 3 without expanding the outer tube packer 20 (not shown). Next, although not shown, a fluid such as water or air is introduced into the outer tube packer 20 to be expanded, and an inner tube for forming the outer tube packer 20 is inserted into the outer tube 7 as shown in FIG. The outer tube 7 is installed in the bore hole 3 of the ground 1. An outer pipe discharge port 5 is provided between the outer pipe packers 20 and 20 of the outer pipe 7.

図４は地盤１に設置された外管７に内管１３を移動自在に挿入して得られる本発明にかかる他の形態の注入管Ａである。この内管１３は図１と同様、外側長手方向に複数の膨縮パッカ８を間隔をあけて設け、互いに隣接する膨縮パッカ８間を吐出位置９とし、この吐出位置９に内管吐出口１０が位置する注入液流路１１と、膨縮パッカ８に出入口１２ａから流体を送って膨張させ、あるいは排出して収縮させるパッカ流路１２とを内部に独立して形成される。そして、前記三個以上の膨縮パッカ８に流体を送って膨縮パッカを膨張させた後、次いで、外管パッカ２０、２０間の外管吐出口５から注入液流路１１の内管吐出口１０を通して地盤１中に注入液を注入する。 FIG. 4 shows another embodiment of the injection tube A according to the present invention obtained by movably inserting the inner tube 13 into the outer tube 7 installed on the ground 1. As in FIG. 1, the inner tube 13 is provided with a plurality of expansion / contraction packers 8 at intervals in the outer longitudinal direction, and a space between adjacent expansion / contraction packers 8 is set as a discharge position 9. An infusion solution flow path 11 in which 10 is located and a packer flow path 12 that is inflated by sending a fluid to the expansion / contraction packer 8 from an inlet / outlet 12a or discharged and contracted are formed independently. Then, the fluid is sent to the three or more expansion / contraction packers 8 to expand the expansion / contraction packers, and then the inner tube discharge of the injection liquid channel 11 from the outer tube discharge port 5 between the outer tube packers 20, 20. An injection solution is injected into the ground 1 through the outlet 10.

図４の注入管Ａの場合も、図１と同様、膨縮パッカ８から流体を排出して膨縮パッカ８を収縮し、内管１３を移動して吐出位置９を他の外管吐出口５に合致させ、注入ステージを移動の後、膨縮パッカ８を膨張させ、同様にして繰り返し注入液を地盤１中に注入する。なお、内管１３の先端部分１３ａもまた、図１と同様、硬質材料で一体化して形成され、しかも、この先端部分１３ａもまた、部分的に撓み部材１９で形成される。 In the case of the injection tube A of FIG. 4 as well, the fluid is discharged from the expansion / contraction packer 8 to contract the expansion / contraction packer 8, and the inner tube 13 is moved to move the discharge position 9 to another outer tube discharge port. 5 and the injection stage is moved, the expansion / contraction packer 8 is expanded, and the injection solution is repeatedly injected into the ground 1 in the same manner. The tip portion 13a of the inner tube 13 is also integrally formed of a hard material as in FIG. 1, and the tip portion 13a is also partially formed of a deflecting member 19.

上述の注入管Ａは地盤１中に挿入するに際して、まず、外管７を例えば図７のようにして地盤１中に埋設する、これを図７を用いて説明すると、近傍地表面２に発進杭２５を形成するとともに、ボーリングマシン２６を設置する。次いで、近傍地表面２のボーリングマシン２６から発進杭２５を経て、先端にドリルヘッド２７を備えたボーリングロッド２８を、ドリルヘッド２７を回転しながら改良すべき地盤１ａ中に押し込み、削孔する。このとき、ボーリングロッド２８はケーシング２９中に挿入された状態で削孔する。削孔を曲げるときには、図示しないが、ドリルヘッド２７の先端テーパ刃を曲げる方向に調整して削孔を続ける。この削孔は反対側の近傍地表面２に到達するまで行ってもよいが、図７に示されるように、改良すべき地盤１ａの末端まで行なうだけでも充分である。 When the above-described injection pipe A is inserted into the ground 1, first, the outer pipe 7 is first embedded in the ground 1 as shown in FIG. 7, which will be described with reference to FIG. 7. A pile 25 is formed and a boring machine 26 is installed. Next, a boring rod 28 having a drill head 27 at the tip is pushed into the ground 1a to be improved while rotating the drill head 27 from the boring machine 26 on the nearby ground surface 2 through the starting pile 25, and drilled. At this time, the boring rod 28 is drilled while being inserted into the casing 29. When bending the drilling hole, although not shown, the drilling is continued by adjusting the tip taper blade of the drill head 27 in the bending direction. This drilling may be performed until reaching the near ground surface 2 on the opposite side, but as shown in FIG. 7, it is sufficient to perform the drilling to the end of the ground 1a to be improved.

続いて、ボーリングロッド２８を引き抜いてケーシング２９のみを地盤１中に残す。このとき、削孔（ボーリング孔３）はケーシング２９によって保護される。さらに続いて、ケーシング２９の中に図示しないが、逆止弁を備えた複数の外管吐出口５、５・・・５を有する外管７を挿入するとともにケーシング２９を引き抜き、外管７の外壁６と削孔壁１６との間の空間１７にシールグラウト１８を填充して図１に示すように外管７を地盤中に設置する。なお、図３および図４に示すように、外管７が外管パッカ２０を備えた場合には、ケーシング２９を引き抜いた後、ボーリング孔３中に外管７を外管パッカ２０が膨張されていない状態で挿入し、その後に外管パッカ２０を膨張させて外管７を地盤１中に設置する。シールグラウト１８は用いない。 Subsequently, the boring rod 28 is pulled out to leave only the casing 29 in the ground 1. At this time, the drilling hole (boring hole 3) is protected by the casing 29. Furthermore, although not shown in the casing 29, the outer tube 7 having a plurality of outer tube discharge ports 5, 5,... A space 17 between the outer wall 6 and the drilling wall 16 is filled with a seal grout 18, and the outer tube 7 is installed in the ground as shown in FIG. 3 and 4, when the outer tube 7 includes the outer tube packer 20, the outer tube packer 20 is expanded into the boring hole 3 after the casing 29 is pulled out. After that, the outer tube packer 20 is expanded and the outer tube 7 is installed in the ground 1. The seal grout 18 is not used.

さらに、上述の外管７は図７を参考にして説明すると、改良すべき地盤１ａの近傍地表面２から、ケーシング２９を回転しながら地盤１に押し込み、屈曲して、または屈曲と直線を任意に組み合わせてボーリングし、得られたボーリング孔３のケーシング２９中に逆止弁を備えた複数の外管吐出口５、５・・・５を有する外管７を挿入するとともに、シールグラウト１８を填充しながらケーシング２９を引き抜き、図１に示すように外管７をシールグラウト１８でシールして地盤１に設置してもよい。 Further, the outer pipe 7 described above will be described with reference to FIG. 7. From the ground surface 2 in the vicinity of the ground 1a to be improved, the casing 29 is pushed into the ground 1 while rotating and bent, or the bending and straight lines are arbitrarily selected. The outer pipe 7 having a plurality of outer pipe discharge ports 5, 5... 5 provided with check valves is inserted into the casing 29 of the obtained bore hole 3, and the seal grout 18 is The casing 29 may be pulled out while being filled, and the outer tube 7 may be sealed with the seal grout 18 and installed on the ground 1 as shown in FIG.

さらにまた、上述の外管７は改良すべき地盤１ａの近傍地表面２から地盤１中に外管７そのものを回転しながら屈曲して、または屈曲と直線と任意に組み合わせてボーリングロッド２８とともに押し込んでボーリングし、ボーリング孔３が所定の位置に達したのち、ボーリングロッド２８を引き抜いて図１に示されるように、外管７を地盤１に設置する。 Furthermore, the outer pipe 7 is bent while rotating the outer pipe 7 itself from the ground surface 2 in the vicinity of the ground 1a to be improved into the ground 1, or is pushed together with the boring rod 28 in any combination of bending and straight lines. Then, after the boring hole 3 reaches a predetermined position, the boring rod 28 is pulled out and the outer tube 7 is installed on the ground 1 as shown in FIG.

図８は注入液送液装置Ｘを用いた本発明にかかる地盤注入工法の説明図である。図８において、上述と同様、地盤１の地盤改良を施すべき個所に、地表面２から斜め下方にわん曲して、次いで、水平方向にボーリング孔３を削孔する。このボーリング孔３に図１に示されるような逆止弁４を備えた複数の外管吐出口５、５・・・５を有する外管７を設置し、この外管７内に、図１に示されるように、外側長手方向に三個以上の膨縮パッカ８、８・・・８を間隔をあけて設けて互いに隣接する膨縮パッカ８、８間を吐出位置９とし、かつ内管吐出口１０が別々の吐出位置９に位置する複数の注入液流路１１と、膨縮パッカ８に流体を送って膨張させ、あるいは排出して収縮させるパッカ流路１２とをそれぞれ内部に独立して形成された内管１３を移動自在に挿入し、吐出位置９を外管吐出口５に合致させた後、パッカ流路１２を通して三個以上の膨縮パッカ８、８・・・８に流体を送って膨縮パッカ８を膨張させ、これにより互いに隣接する膨縮パッカ８、８によって挟まれるすき間１４に管内空間１５を形成し、注入液を内管吐出口１０を通して注入液送液装置Ｘから管内空間１５および外管吐出口５を経て地盤１に注入する。図８では、上述の外管７および内管１３の詳細な記載は省略し、外管７内に内管１３が移動自在に挿入された状態を注入管Ａとして表す。 FIG. 8 is an explanatory view of the ground injection method according to the present invention using the injection liquid feeding device X. In FIG. 8, similarly to the above, the ground 1 of the ground 1 is bent diagonally downward from the ground surface 2 and then the bored hole 3 is drilled in the horizontal direction. An outer pipe 7 having a plurality of outer pipe discharge ports 5, 5... 5 provided with a check valve 4 as shown in FIG. 1 is installed in the boring hole 3. As shown in FIG. 5, three or more expansion / contraction packers 8, 8... 8 are provided at intervals in the outer longitudinal direction, and the discharge positions 9 are provided between the expansion / contraction packers 8, 8 adjacent to each other. A plurality of injection liquid flow paths 11 in which the discharge ports 10 are located at different discharge positions 9 and a packer flow path 12 for supplying fluid to the expansion / contraction packer 8 to expand or discharge and contract are independently provided. The inner tube 13 formed in this manner is movably inserted, the discharge position 9 is made to coincide with the outer tube discharge port 5, and then the fluid is passed through the packer channel 12 to three or more expansion / contraction packers 8, 8. To inflate the expansion / contraction packer 8, thereby being sandwiched between the expansion / contraction packers 8, 8 adjacent to each other. The tube space 15 is formed between 14 come from the infusate liquid feeder X through the pipe space 15 and the outer tube discharge port 5 is injected into the ground 1 of the infusate through the inner tube the discharge port 10. In FIG. 8, detailed description of the outer tube 7 and the inner tube 13 is omitted, and a state in which the inner tube 13 is movably inserted into the outer tube 7 is represented as an injection tube A.

図８に示される注入液送液装置Ｘは制御部３０、注入液加圧部３１、注入液分配部３２,注入部３３および送液系３４から構成される。操業を手動で行う場合には、制御部３０は必要としない。以下、制御部３０を用いた例について具体的に詳述する。 The infusion solution delivery apparatus X shown in FIG. 8 includes a control unit 30, an infusion solution pressurizing unit 31, an infusion solution distribution unit 32, an infusion unit 33, and a solution delivery system 34. When the operation is performed manually, the control unit 30 is not necessary. Hereinafter, an example using the control unit 30 will be specifically described in detail.

注入液加圧部３１は図８に示されるように、注入液槽３５からの注入液をポンプ３６（グラウトポンプ）により加圧し、加圧注入液として送液系３４を介して注入液分配部３２に送液する。グラウトポンプ３６は制御部３０の注入監視盤３０ａからの指示を受け、注入液を所望の圧力に加圧する。 As shown in FIG. 8, the infusate pressurizing unit 31 pressurizes the infusate from the infusate tank 35 by a pump 36 (grout pump), and the infusate distribution unit via the liquid feed system 34 as a pressurized infusate. 32. The grout pump 36 receives an instruction from the injection monitoring board 30a of the control unit 30 and pressurizes the injected liquid to a desired pressure.

注入液分配部３２は複数本の分岐管３７、３７・・・３７を備える。これら分岐管３７、３７・・・３７はそれぞれ先端に注入管Ａと連結する連結部３８を有する。この連結部３８は所定の注入管Ａを通して所定の注入量を注入し終わった時点、あるいは所定の注入圧に達した時点で、その分岐管３７を他の注入管Ａに連結換えすることもできる。 The injection solution distribution unit 32 includes a plurality of branch pipes 37, 37. Each of these branch pipes 37, 37... 37 has a connecting portion 38 connected to the injection pipe A at the tip. The connecting portion 38 can replace the branch pipe 37 with another injection pipe A when the predetermined injection amount is injected through the predetermined injection pipe A or when the predetermined injection pressure is reached. .

上述の分岐管３７、３７・・・３７は図８に示されるように、送液系３４を介して加圧部３１と連結された分配部３９からのそれぞれ伸長して配置され、先端の連結部３８で注入管Ａと連結される。そして、加圧部３１からの加圧注入液は分配容器３９を介して各分岐管３７、３７・・・３７に分配され、注入管Ａに送液される。なお、この分配容器３９には図示しない攪拌装置を備えることもできる。また、各分岐管３７、３７・・・３７は分配容器３９を経たずに、直後、加圧部３１からの送液系３４と連結することもできる。 As shown in FIG. 8, the branch pipes 37, 37... 37 described above are arranged to extend from the distributor 39 connected to the pressurizer 31 via the liquid feeding system 34, and are connected at the tip. The portion 38 is connected to the injection tube A. And the pressurization injection liquid from the pressurization part 31 is distributed to each branch pipe 37, 37 ... 37 via the distribution container 39, and is sent to the injection pipe A. The distribution container 39 can be provided with a stirring device (not shown). Moreover, each branch pipe 37, 37 ... 37 can also be connected with the liquid feeding system 34 from the pressurization part 31 immediately after not passing through the distribution container 39. FIG.

また、図８において、分岐流量計ｆ_１、ｆ_２・・・ｆ_ｉ、ｆ_ｎの総量を測定することにより送液流量計４０の流量を把握することができ、このため、送液流量計４０は必ずしも必要としない。さらに、送液圧力計４１は必ずしも送液系３４に設けなくても、直後、分配容器３９に設けてもよい。Ｖ_１〜Ｖ_４は分岐バルブ、Ｐ_１〜Ｐ_４は分岐圧力計、３０ｂは操作盤３０ｃは注入記録盤、３０ｄはデータ入力装置、４２は送液バルブである。また、４３は膨縮パッカ８に流体を送液する圧力ボンベ、４４は内管自動昇降機であって、いずれも制御部３０と接続され、制御部３０からの指示を受けて作動する。 Further, in FIG. 8, the flow rate of the liquid flow meter 40 can be grasped by measuring the total amount of the branch flow meters f _1, f ₂ ... F _i, f _n. 40 is not necessarily required. Further, the liquid feeding pressure gauge 41 is not necessarily provided in the liquid feeding system 34 but may be provided in the distribution container 39 immediately after. V _{1 to} V ₄ are branch valves, P _{1 to} P ₄ are branch pressure gauges, 30 b is an operation panel 30 c is an injection recording board, 30 d is a data input device, and 42 is a liquid feed valve. Reference numeral 43 denotes a pressure cylinder for sending fluid to the expansion / contraction packer 8, and 44 denotes an inner pipe automatic elevator, both of which are connected to the control unit 30 and operate in response to an instruction from the control unit 30.

図９は注入液送液装置として多連装注入装置を用いた本発明にかかる地盤注入工法の説明図であって、注入液を貯蔵する注入液槽３５と、一プラント中にそれぞれモータ等の独立したあるいは図示しないが共通の駆動源４５で作動し、かつ制御部３０に接続されて制御される多数のユニットポンプ４６、４６・・・４６と、これら各ユニットポンプ４６、４６・・・４６から伸長され、配置される送液管４７，４７・・・４７とを備えて構成される。各送液管４７、４７・・・４７の先端に連結部３８を備え、地盤１のボーリング孔３に挿入された注入管Ａの図示しない内管１３の注入液流路１１に連結される。注入液槽３５中の注入液は各ユニットポンプ４６、４６・・・４６の作動により任意の注入速度、注入圧力あるいは注入量で各注入管Ａの注入液流路１１に圧送され、複数の外管吐出口５、５・・・５からゴムスリーブ４を押し開けて同時に地盤１に多点注入される。Ｖは分岐バルブである。圧力ボンベ４３および自動昇降機４４は図８と同様に制御部３０からの指示を受けて作動する。 FIG. 9 is an explanatory view of a ground injection method according to the present invention using a multi-injection injection device as an injection solution feeding device, and an injection solution tank 35 for storing the injection solution and an independent motor or the like in each plant. Although not shown in the drawing, the unit pumps 46, 46... 46 operated by a common drive source 45 and connected to the control unit 30 are controlled, and these unit pumps 46, 46. The liquid supply pipes 47, 47,... A connecting portion 38 is provided at the tip of each liquid feeding pipe 47, 47... 47, and is connected to the injection liquid flow path 11 of the inner pipe 13 (not shown) of the injection pipe A inserted into the boring hole 3 of the ground 1. The injection liquid in the injection liquid tank 35 is pumped to the injection liquid flow path 11 of each injection pipe A at an arbitrary injection speed, injection pressure or injection volume by the operation of each unit pump 46, 46. The rubber sleeve 4 is pushed open from the tube discharge ports 5, 5. V is a branch valve. The pressure cylinder 43 and the automatic elevator 44 operate in response to an instruction from the control unit 30 as in FIG.

本発明にかかる注入工法は特に建物等の構造物下方の処理に適している。例えば、図１０のように構造物２１下方の深さ方向に複数層積層して処理することもでき、あるいはさらに、図１２の平面図に示されるように、構造物２１下方に水平面に注入孔を複数本並列して設定し、あるいはさらに、図１１に示すように深さ方向に設定し、複数層形成することもできる。 The injection method according to the present invention is particularly suitable for processing under a structure such as a building. For example, a plurality of layers can be laminated in the depth direction below the structure 21 as shown in FIG. 10, or, further, as shown in the plan view of FIG. Can be set in parallel, or can be set in the depth direction as shown in FIG. 11 to form a plurality of layers.

本発明は図１２の浸透の挙動を複数の吐出口から同時注入するという手法とともに、注入液を注入液加圧部から複数の注入液送液系統を通して前記地盤中の注入ポイントに注入し、前記複数の注入液送液系統には流量圧力検出器を設け、これら検出器から検出された注入液の流量および／または圧力のデータを注入監視盤を備えた集中管理装置に送信し、注入液送液系統からの注入状況を前記注入監視盤の画面に表示し、一括監視を行いながら、選定した複数の注入ポイントから注入を同時に行い、それぞれの注入状況を把握することにより各注入管路における注入開始から終了に至るまでの工程はそれぞれ別々に行いながら、かつ、全体の注入管理を行うことが可能なため、図１１、図１２における注入液の挙動に基づき、所定の場所に所定の形状の固結体を形成できる。 The present invention, together with the method of simultaneously injecting the behavior of seepage of FIG. 12 from a plurality of outlets, injects an injection solution from an injection solution pressurizing unit through a plurality of injection solution feeding systems to the injection point in the ground, A plurality of infusion solution delivery systems are provided with flow rate pressure detectors, and the infusion solution flow rate and / or pressure data detected from these detectors is transmitted to a centralized control device equipped with an infusion monitoring panel for infusion solution delivery. The injection status from the liquid system is displayed on the screen of the injection monitoring panel, and while performing batch monitoring, injection is performed simultaneously from a plurality of selected injection points, and each injection status is determined by checking the status of each injection. Since the process from the start to the end can be performed separately and the entire injection control can be performed, the predetermined place is determined based on the behavior of the injection solution in FIGS. The possible formation caking body shape.

地盤の改良すべき個所に、任意形状のボーリング孔を穿孔し、このボーリング孔から複数の吐出口を介して注入液を地盤中に同時に注入して改良するようにしたから、水平方向に設置した注入管からの注入にもかかわらず、所定の位置に所定の浸透固結形態に浸透固結を可能にするとともに、地盤注入の施し難い既設構造物下方の支持地盤を急速かつ確実に、かつ広範囲に地盤改良を施工し得、産業上有用な発明である。 Boreholes of arbitrary shape were drilled in the place to be improved on the ground, and the injection solution was simultaneously injected into the ground through the multiple discharge ports from this borehole, so it was installed horizontally. Despite injection from the injection tube, it enables infiltration consolidation to a predetermined position in a predetermined infiltration solidification form, and the supporting ground below the existing structure, which is difficult to perform ground injection, can be rapidly and reliably spread over a wide area. It is an industrially useful invention that can be applied to ground improvement.

本発明にかかる注入管を説明するための基本構造を表した断面図である。It is sectional drawing showing the basic structure for demonstrating the injection pipe concerning this invention. 実際の施工に使用される注入管の断面図である。It is sectional drawing of the injection pipe used for actual construction. 外管パッカを三個以上有する外管を地盤中に設置した状態の断面図である。It is sectional drawing of the state which installed the outer pipe | tube which has three or more outer pipe | tube packers in the ground. 図３の外管に本発明にかかる内管を挿入した状態の断面図である。It is sectional drawing of the state which inserted the inner tube concerning this invention in the outer tube | pipe of FIG. 構造物直下の改良すべき地盤処理の基本模式図である。It is a basic schematic diagram of the ground treatment to be improved directly under the structure. 構造物直下の改良すべき地盤処理の他の基本模式図である。It is another basic schematic diagram of the ground treatment to be improved directly under the structure. 構造物下方のボーリング状態を表した説明図である。It is explanatory drawing showing the boring state below a structure. 注入液送液装置を用いて本発明注入工法を実施するための説明図である。It is explanatory drawing for implementing this invention injection construction method using an injection liquid feeding apparatus. 他の注入液送液装置を用いて本発明注入工法を実施するための説明図である。It is explanatory drawing for implementing this invention injection construction method using another injection liquid sending apparatus. 構造物下方の地盤注入例の縦断面図である。It is a longitudinal cross-sectional view of the example of ground injection below the structure. 本発明方法で注入固結した状態を表した説明図である。It is explanatory drawing showing the state inject | poured and consolidated by the method of this invention. 構造物下方の地盤注入例の平面図である。It is a top view of the example of ground injection below a structure.

符号の説明Explanation of symbols

Ａ注入管
Ｘ注入液送液装置
１地盤
１ａ改良すべき地盤
２地表面
３ボーリング孔
４逆止弁（ゴムスリーブ）
５外管吐出口
６外壁
７外管
８膨縮パッカ
９吐出位置
１０内管吐出口
１１注入液流路
１２パッカ流路
１２ａ出入口
１３内管
１３ａ先端部分
１４すき間
１５管内空間
１６削孔壁
１７空間
１８シールグラウト
１９撓み部材
２０外管パッカ
A Infusion tube X Infusion solution delivery system 1 Ground 1a Ground to be improved 2 Ground surface 3 Boring hole 4 Check valve (rubber sleeve)
DESCRIPTION OF SYMBOLS 5 Outer tube discharge port 6 Outer wall 7 Outer tube 8 Expansion / contraction packer 9 Discharge position 10 Inner tube discharge port 11 Injection liquid flow path 12 Packer flow path 12a Inlet / outlet 13 Inner pipe 13a Tip part 14 Clearance 15 Inner space 16 Hole hole 17 Space 18 Seal grout 19 Deflection member 20 Outer tube packer

Claims

次の（ａ）〜（ｇ）の各工程の組み合わせからなる地盤注入工法。
（ａ）改良すべき地盤の近傍地表面から地盤中に屈曲して、または屈曲と直線を任意に組み合わせてボーリングする。
（ｂ）得られたボーリング孔中に、外側長手方向に間隔をあけて逆止弁を備えた複数の外管吐出口を有する外管を設置する。
（ｃ）この外管内に、外側長手方向に三個以上の膨縮パッカを間隔をあけて設け、互いに隣接する膨縮パッカ間を内管吐出位置とする内管を移動自在に挿入する。
（ｄ）前記内管内部には、前記内管吐出位置に位置する内管吐出口を備えた複数の注入液流路と、膨縮パッカに流体を送って膨張させ、あるいは排出して収縮させるパッカ流路とをそれぞれ独立して形成する。
（ｅ）前記内管吐出位置を外管吐出口に合致させた後、パッカ流路を通して前記三個以上の膨縮パッカに流体を送って該膨縮パッカを膨張させる。
（ｆ）これにより互いに隣接する膨縮パッカによって挟まれるすき間に複数の管内空間を形成する。
（ｇ）複数の内管吐出口から注入液をそれぞれの管内空間および外管吐出口を経て地盤に注入する。 A ground injection method comprising a combination of the following steps (a) to (g).
(A) Bending from the ground surface in the vicinity of the ground to be improved into the ground, or by arbitrarily combining bending and straight lines.
(B) An outer tube having a plurality of outer tube discharge ports provided with check valves is installed in the obtained boring hole at intervals in the outer longitudinal direction .
(C) In this outer tube, three or more expansion / contraction packers are provided at intervals in the outer longitudinal direction, and an inner tube having an inner tube discharge position between adjacent expansion / contraction packers is movably inserted.
(D) Inside the inner pipe, a plurality of injection liquid flow paths having an inner pipe discharge port located at the inner pipe discharge position, and a fluid is sent to the expansion / contraction packer to be expanded or discharged to be contracted. The packer flow paths are formed independently of each other.
(E) After the inner tube discharge position is matched with the outer tube discharge port, fluid is sent to the three or more expansion / contraction packers through the packer flow path to expand the expansion / contraction packers.
(F) As a result, a plurality of in-pipe spaces are formed in the gaps sandwiched between the expansion / contraction packs adjacent to each other.
(G) The injection solution is injected from the plurality of inner tube discharge ports into the ground via the respective tube inner space and the outer tube discharge port.

膨縮パッカから流体を排出して前記膨縮パッカを収縮し、内管を移動して吐出位置を他の外管吐出口に合致させ、注入ステージを移動の後、膨縮パッカを膨張させて管内空間を形成し、同様にして繰り返し注入液を地盤注入する請求項１に記載の地盤注入工法。 And discharging the fluid to contract the inflation and deflation packer from deflating the packer, the discharge position by moving the inner tube is matched to the other outer tube discharge port, the injection stage after the movement, by expanding the expansion and contraction packer The ground injection method according to claim 1, wherein a space in the pipe is formed and the injection solution is repeatedly injected into the ground in the same manner.

注入液流路およびパッカ流路の挿入された内管は少なくとも先端部分が硬質材料で一体化して形成される請求項１に記載の地盤注入工法。 The ground injection method according to claim 1, wherein at least a tip portion of the inner pipe into which the injection liquid channel and the packer channel are inserted is formed of a hard material.

硬質材料で一体化された内管先端部分は部分的に撓み部材で形成される請求項３に記載の地盤注入工法。 The ground injection method according to claim 3, wherein the inner tube tip portion integrated with the hard material is partially formed of a flexible member.

次の（ａ）〜（ｇ）の各工程の組み合わせからなる地盤注入工法。
（ａ）改良すべき地盤の近傍地表面から地盤中に屈曲して、または屈曲と直線を任意に組み合わせてボーリングする。
（ｂ）得られたボーリング孔中に、外側長手方向に三個以上の外管パッカを間隔をあけてはめ込み、かつ互いに隣接する外管パッカ間に外管吐出口を有する外管を設置する。
（ｃ）この外管内に、外側長手方向に三個以上の膨縮パッカを間隔をあけて設け、互いに隣接する膨縮パッカ間を内管吐出位置とする内管を移動自在に挿入する。
（ｄ）前記内管内部には、前記内管吐出位置に位置する内管吐出口を備えた複数の注入液流路と、膨縮パッカに流体を送って膨張させ、あるいは排出して収縮させるパッカ流路とをそれぞれ独立して形成する。
（ｅ）前記内管吐出位置を外管吐出口に合致させる。
（ｆ）その後、パッカ流路を通して前記三個以上の膨縮パッカに流体を送って、該膨縮パッカを膨張させる。
（ｇ）次いで、外管パッカ間の外管吐出口から注入液流路の内管吐出口を通して地盤中に注入液を注入する。 A ground injection method comprising a combination of the following steps (a) to (g).
(A) Bending from the ground surface in the vicinity of the ground to be improved into the ground, or by arbitrarily combining bending and straight lines.
(B) In the obtained boring hole, three or more outer tube packers are fitted at intervals in the outer longitudinal direction, and an outer tube having an outer tube discharge port is installed between adjacent outer tube packers.
(C) In this outer tube, three or more expansion / contraction packers are provided at intervals in the outer longitudinal direction, and an inner tube having an inner tube discharge position between adjacent expansion / contraction packers is movably inserted.
(D) Inside the inner pipe, a plurality of injection liquid flow paths having an inner pipe discharge port located at the inner pipe discharge position, and a fluid is sent to the expansion / contraction packer to be expanded or discharged to be contracted. The packer flow paths are formed independently of each other.
(E) The inner tube discharge position is matched with the outer tube discharge port.
(F) Thereafter, a fluid is sent to the three or more expansion / contraction packers through the packer flow path to expand the expansion / contraction packers.
(G) Next, the injection solution is injected into the ground from the outer tube discharge port between the outer tube packers through the inner tube discharge port of the injection solution channel.

膨縮パッカから流体を排出して膨縮パッカを収縮し、内管を移動して吐出位置を他の外管吐出口に合致させ、注入ステージを移動の後、膨縮パッカを膨張させ、同様にして繰り返し注入液を地盤中に注入する請求項５に記載の地盤注入工法。 The fluid is discharged from the expansion / contraction packer, the expansion / contraction packer is contracted, the inner tube is moved, the discharge position is matched with the other outer tube discharge port, the injection stage is moved, the expansion / contraction packer is expanded, and the like The ground injection method according to claim 5, wherein the injection solution is repeatedly injected into the ground.

注入液流路およびパッカ流路の挿入された内管は少なくとも先端部分が硬質材料で一体化して形成される請求項５に記載の地盤注入工法。 The ground injection method according to claim 5, wherein at least a tip portion of the inner pipe into which the injection liquid channel and the packer channel are inserted is formed of a hard material.

硬質材料で一体化された内管先端部分は部分的に撓み部材で形成される請求項５に記載の地盤注入工法。

The ground injection method according to claim 5, wherein the tip portion of the inner pipe integrated with the hard material is partially formed of a flexible member.