JP5163972B1

JP5163972B1 - Injection pipe device and injection method

Info

Publication number: JP5163972B1
Application number: JP2012133980A
Authority: JP
Inventors: 俊介島田; 忠雄小山; 良太宇賀; 隆善松永; 浩大島
Original assignee: 強化土株式会社; 強化土エンジニヤリング株式会社; 株式会社大阪防水建設社
Priority date: 2012-06-13
Filing date: 2012-06-13
Publication date: 2013-03-13
Anticipated expiration: 2032-06-13
Also published as: JP2013256824A

Abstract

【課題】地盤状況が層毎に異なる地盤に対し、複数の注入ステージ(層)に同時に又は各ステージ毎、或いは注入するステージを任意に選択して最適量の注入液を注入可能な注入管装置、注入装置及び注入工法を提供する。
【解決手段】管軸方向に並列に設置された一本のパッカー用注入管1と複数の注入用細管2、パッカー用注入管1と複数の注入用細管2とを結束する複数の結束具6、パッカー用注入管1及び注入用細管2の管軸方向に間隔をおいて設置された複数の袋パッカー3及び各袋パッカー3,3間にそれぞれ設置された複数の柱状浸透空間4を備えて構成する。パッカー用注入管1は複数の袋パッカー3,3間に連続して設置し、かつ各袋パッカー3とそれぞれ連通させる。複数の注入用細管２はそれぞれ各柱状浸透空間4に連通させる。パッカー用注入管1、注入用細管2、袋パッカー3及び柱状浸透空間4は、変形性と柔軟性に富んだ素材から形成する。
【選択図】図１An injection tube device capable of injecting an optimal amount of injection solution into a plurality of injection stages (layers) simultaneously or for each stage or arbitrarily selecting an injection stage for a ground having different ground conditions for each layer. An injection apparatus and an injection method are provided.
SOLUTION: One packer injection tube 1 and a plurality of injection thin tubes 2 installed in parallel in the tube axis direction, and a plurality of binding tools 6 for binding the packer injection tube 1 and the plurality of injection thin tubes 2 together. A plurality of bag packers 3 installed at intervals in the tube axis direction of the packer injection tube 1 and the injection thin tube 2 and a plurality of columnar infiltration spaces 4 installed between the bag packers 3 and 3, respectively. Configure. The packer injection tube 1 is continuously installed between the plurality of bag packers 3 and 3 and communicates with each of the bag packers 3. Each of the plurality of injection capillaries 2 communicates with each columnar infiltration space 4. The packer injection tube 1, the injection thin tube 2, the bag packer 3, and the columnar infiltration space 4 are formed of a material rich in deformability and flexibility.
[Selection] Figure 1

Description

本発明は、一本のパッカー用注入管と複数の注入用細管を備えた注入管装置および当該注入管装置による注入工法に関し、主として地盤状況が層ごとに異なる地盤に対して、複数の注入ステージ(層)に同時にまたは各ステージごとに、あるいは注入ステージを適宜選択して注入することができ、また大きな柱状浸透空間からの低圧注入により、大きな吐出量の土粒子間浸透により効率的に地盤注入を行うことができる。 The present invention relates to an injection tube device including a single packer injection tube and a plurality of injection thin tubes, and an injection method using the injection tube device, and a plurality of injection stages mainly for ground having different ground conditions for each layer. (Layer) can be injected at the same time or for each stage, or by selecting an injection stage as appropriate, and by low pressure injection from a large columnar infiltration space, ground injection can be efficiently carried out by infiltration between soil particles with a large discharge amount It can be performed.

一般に、地盤は各層ごとに透水係数や間隙率が異なるため、各層ごとに地盤状況が異なる。このため、注入管を用いた地盤注入工法としては、例えば、数ｃｍごとまたは数十ｃｍごとに注入ステージを上下方向に移動しながら瞬結グラウトと緩結グラウトを交互に注入する二重管ロッド工法、あるいはセメント系の一次注入材を注入した後に溶液型の二次注入材を注入する二重管ダブルパッカー工法などが一般に利用されている。 In general, since the ground has different hydraulic conductivity and porosity for each layer, the ground conditions are different for each layer. For this reason, as a ground injection method using an injection tube, for example, a double tube rod that alternately injects instantaneous grouting and slow grouting while moving the injection stage up and down every few centimeters or tens of centimeters. A construction method or a double-pipe double packer method in which a solution type secondary injection material is injected after a cement-based primary injection material is injected is generally used.

また、管軸方向の異なる位置に吐出口を有する二重管構造の注入管を地盤中に設置し、地上から注入管と各吐出口を介して複数の層に注入材を同時注入する注入工法も利用されている。 In addition, a double pipe structure injection pipe having discharge ports at different positions in the tube axis direction is installed in the ground, and an injection material is injected simultaneously into the plurality of layers from the ground via the injection pipe and each discharge port. Is also used.

さらに、特許文献１,2には、吐出口をそれぞれ有する複数の独立した注入用細管を、各吐出口が管軸方向に互いに間隔を置いて位置するように結束して形成された結束注入管と、当該結束注入管の周囲に管軸方向に間隔をおいて設置された複数のパッカーを備え、削孔内で管軸方向に互いに隣接する一対の各パッカーと孔壁との間で独立した空間を形成し、この空間の孔壁全体を通して吐出口からの注入材を孔壁周囲の地盤中に浸透せしめるように構成された注入管装置が開示されている。 Further, Patent Documents 1 and 2 describe a bundled injection tube formed by binding a plurality of independent injection capillaries each having a discharge port so that the discharge ports are spaced from each other in the tube axis direction. And a plurality of packers disposed around the bundling injection tube at intervals in the tube axis direction, and independent between a pair of packers adjacent to each other in the tube axis direction and the hole wall in the drilling hole. An injection pipe device is disclosed which is configured to form a space and allow the injection material from the discharge port to penetrate into the ground around the hole wall through the entire hole wall of the space.

特開２００１−１３１９５１号公報JP 2001-131951 A 特開２００１−１３１９５３号公報JP 2001-131953 A 特開２００３−１３８５５２号公報JP 2003-138552 A 特開２００４−１３７７５０号公報JP 2004-137750 A

上記した二重管ロッド工法や二重管ダブルパッカー工法などの注入管を用いた注入工法は、いずれも一ステージの注入作業が終了するたびに、注入管を上下方向に移動して同じ作業を繰返し行う必要があるため、作業に時間を要して施工効率が悪く、工費が嵩む等の課題があった。 The injection method using the injection pipe such as the double pipe rod method and the double pipe double packer method described above is the same as moving the injection pipe up and down each time one stage of injection work is completed. Since it is necessary to carry out repeatedly, there are problems such as that it takes time to work, the construction efficiency is poor, and the construction cost is increased.

また、基本的に注入管の径に相当する球状の浸透源から浸透されるため、経済的な吐出速度とされる10L〜20L/分の注入では、土粒子間浸透が困難で脈状注入になりやすく、しかも、瞬結グラウトを先行注入し、その後からゲル化時間の長い二次注入材を注入しても、二次注入材は先行注入した瞬結グラウトに沿って脈状に注入されてしまうという課題があった。 In addition, since it is infiltrated from a spherical infiltration source corresponding to the diameter of the injection tube, it is difficult to infiltrate between soil particles at an injection rate of 10 L to 20 L / min, which is considered to be an economical discharge rate. Even if a quick injection grout is pre-injected and then a secondary injection material with a long gelation time is injected after that, the secondary injection material is injected in a pulse shape along the pre-injected instantaneous connection grout. There was a problem of ending up.

さらに、上記特許文献1,2に開示された注入管装置は、特に複数のパッカー用注入管がパッカーごとに地上から各パッカーまで挿入されているため、パッカーの数に比例してパッカー用注入管の数が増え、これに伴い注入管を挿入するための削孔径を大きくする必要があり、削孔および掘削残土の処理などに施工コストが嵩む等の課題があった。また、注入管の数が多くなり装置が複雑なって、取り扱いが煩雑になりやすくなる等の課題もあった。 Further, the injection tube device disclosed in Patent Documents 1 and 2 is particularly characterized in that a plurality of packer injection tubes are inserted from the ground to each packer for each packer, so that the packer injection tube is proportional to the number of packers. Accordingly, it is necessary to increase the diameter of the hole for inserting the injection pipe, and there is a problem that the construction cost increases in the processing of the hole and the excavated residual soil. In addition, the number of injection tubes is increased, the apparatus becomes complicated, and there are problems such as easy handling.

また、パッカーを膨張させる方法として、パッカー用注入管に注入内管を挿入し、当該パッカー用注入管の各パッカー内に通じるパッカー内注入口に注入内管のパッカー内吐出口を連通させ、パッカー一個一個に注入を行ってパッカーを膨張させる方法も実施されているが、パッカー用注入管の径を大きくする必要があり、これに伴い注入管を挿入する削孔径も大きくする必要があり、その上パッカーを膨張させる手間も繁雑なため、施工する上で経済性に問題があった。 Also, as a method of expanding the packer, an injection inner tube is inserted into the packer injection tube, and the packer discharge port of the injection inner tube communicates with the packer injection port leading to each packer of the packer injection tube. A method of inflating the packer by injecting it one by one is also implemented, but it is necessary to increase the diameter of the injection tube for the packer, and accordingly, it is necessary to increase the diameter of the hole for inserting the injection tube. Since the trouble of expanding the upper packer is complicated, there was a problem in economics in construction.

本発明は、以上の課題を解決するためになされたもので、パッカーの構造と作業性にすぐれた注入管装置および注入装置を用いることにより、主として地盤状況が層ごとに異なる地盤に対して、複数の注入ステージ(層)に同時にまたは各ステージごとに、あるいは注入ステージを適宜選択して注入を行うことができ、また大きな柱状浸透空間からの低圧注入により、大きな吐出量の土粒子間浸透により効率的に地盤注入を行うことができる注入管装置および当該注入管装置による注入工法を提供することを目的とするものである。 The present invention was made in order to solve the above problems, and by using an injection tube device and an injection device excellent in the structure and workability of the packer, mainly for the ground where the ground condition is different for each layer, It is possible to perform injection at multiple injection stages (layers) simultaneously or for each stage, or by selecting an injection stage as appropriate, and by low-pressure injection from a large columnar infiltration space, It is an object of the present invention to provide an injection tube device capable of efficiently performing ground injection and an injection method using the injection tube device .

本発明の注入管装置は、管軸方向に並列に設置され、かつ削孔内に挿入された一本のパッカー用注入管と複数の注入用細管、前記パッカー用注入管と複数の注入用細管とを結束する複数の結束具、前記パッカー用注入管および複数の注入用細管の管軸方向に間隔をおいて設置される複数の袋パッカーおよび前記各袋パッカー間に設置された複数の柱状浸透空間を備え、前記パッカー用注入管は複数の袋パッカー間に連続して設置され、かつパッカー用注入管の周壁に形成されたパッカー内吐出口を介して各袋パッカーと連通し、前記複数の注入用細管はそれぞれ各柱状浸透空間と連通し、前記複数の袋パッカーは前記パッカー用注入管を介して注入されるパッカー用充填液によって削孔の一番深い位置の袋パッカーから一番浅い位置の袋パッカーまで順に膨張して削孔の孔壁を押圧するように設置され、前記柱状浸透空間は各袋パッカー間に前記パッカー用注入管および注入用細管の周囲を覆うように透水性被覆材を設置することにより形成され、かつ各注入用細管を介して注入される注入液が前記複数の袋パッカー間の透柱状浸透空間の透水性被覆材を通して削孔壁の全周から地盤中に注入されるように構成されていることを特徴とするものである。 The injection tube device of the present invention includes a single packer injection tube and a plurality of injection capillaries that are installed in parallel in the tube axis direction and inserted into a drilling hole , and the packer injection tube and a plurality of injection capillaries A plurality of binding tools, a plurality of bag packers installed at intervals in the tube axis direction of the packer injection tube and a plurality of injection thin tubes, and a plurality of columnar penetrations installed between the bag packers The packer injection tube is continuously installed between a plurality of bag packers, and communicates with each bag packer through a discharge port in the packer formed on the peripheral wall of the packer injection tube . Each of the injection thin tubes communicates with each columnar infiltration space, and the plurality of bag packers are located at the shallowest position from the bag packer at the deepest position of the hole by the packer filling liquid injected through the packer injection tube. Bag It is installed so as to expand in order to press the hole wall of the drilling hole, and a water-permeable covering material is installed in the columnar infiltration space so as to cover the periphery of the injection tube for the packer and the thin tube for injection between the bag packers. The injection solution formed through the injection and through each injection capillary is injected into the ground from the entire circumference of the drilling wall through the water-permeable covering material of the through-pillar penetration space between the plurality of bag packers. It is comprised so that it may be comprised .

本発明は、削孔内に複数の柱状浸透空間を削孔方向に複数層に形成し、当該複数の柱状浸透空間に注入用細管を通して地上から注入液を送り込み、各柱状浸透空間から複数のステージ（層）に同時にまたは各ステージごとに、あるいは注入すべきステージを任意に選択して注入液を注入することにより、地盤状況が層ごとに異なる地盤に対して最適量の注入液を注入して地盤改良を効率的にかつ経済的に行うようにしたものである。 The present invention forms a plurality of columnar permeation spaces in the drilling holes in a plurality of layers in the direction of drilling, and sends the injection solution from the ground through the injection thin tubes into the plurality of columnar permeation spaces, and a plurality of stages from each columnar permeation space By injecting the injection solution into the (layer) at the same time or for each stage, or by arbitrarily selecting the stage to be injected, the optimal amount of injection solution is injected into the ground where the ground conditions differ from layer to layer. The ground is improved efficiently and economically.

特に、各柱状浸透空間からの低圧注入により大きな吐出量で土粒子間浸透を可能にして、注入工法による地盤改良をきわめて効率的かつ経済的に行えるようにしたものである。 In particular, the low-pressure injection from each columnar infiltration space enables infiltration between soil particles with a large discharge amount, so that the ground improvement by the injection method can be performed very efficiently and economically.

パッカー用注入管は、削孔の一番深い位置の袋パッカーまで連続して挿入され、かつ当該パッカー用注入管の周壁に形成されたパッカー内吐出口を介して各袋パッカーと連通していることにより、一本のパッカー用注入管の先端部から複数の袋パッカーにパッカー用充填液を送り込むことができるので、パッカー用充填液の充填をきわめて効率的に行うことができ、また削孔径を小さくすることができる。 The packer injection tube is continuously inserted up to the bag packer at the deepest position of the drilling hole, and communicates with each bag packer through the discharge port in the packer formed on the peripheral wall of the packer injection tube. As a result, the packer filling liquid can be fed into the plurality of bag packers from the tip of one packer injection tube, so that the packer filling liquid can be filled very efficiently and the hole diameter can be reduced. Can be small.

なお、当該パッカー用注入管を用いることにより、地上に延びるパッカー用注入管の上端部からパッカー用充填液を送り込んで加圧すると、パッカー用充填液は最初に重力によってパッカー用注入管内をその最下端部まで注入され、各パッカー内吐出口より一番深い位置の袋パッカーから順に充填されて一番浅い位置の袋パッカーまで連続的に順に膨張される。 In addition, by using the packer injection tube, when the packer filling liquid is fed from the upper end of the packer injection tube extending above the ground and pressurized, the packer filling liquid first passes through the packer injection tube by gravity. It is injected to the lower end portion, filled in order from the bag packer at the deepest position than the discharge port in each packer, and continuously expanded to the bag packer at the shallowest position.

さらに、パッカー用充填液を加圧注入し、最後にパッカー用注入管の上端部を密閉しておけば、袋パッカーは膨張したまま時間の経過と共に固化する。 Furthermore, if the packer filling liquid is injected under pressure and finally the upper end of the packer injection tube is sealed, the bag packer will solidify over time with expansion.

このため、パッカー用注入管の各パッカー内吐出口に逆止弁を取り付ける必要はなくなり、これによりパッカー用注入管を簡単な構造にすることができ、また注入作業も容易になる。 For this reason, there is no need to attach a check valve to the discharge port in each packer of the packer injection tube, whereby the packer injection tube can have a simple structure and the injection work is facilitated.

したがって、袋パッカーごとにパッカー用注入管を装着しなくてもよく、また、パッカー用注入管内に注入内管を挿入し、当該注入管を牽き上げながら袋パッカー内に充填液を注入するというような作業は不要になる。 Therefore, it is not necessary to install a packer injection tube for each bag packer, and an injection inner tube is inserted into the packer injection tube, and the filling liquid is injected into the bag packer while picking up the injection tube. An unnecessary work becomes unnecessary.

さらに、パッカー用注入管およびパッカー用注入管を挿入する削孔も小径でよいので経済的な施工が可能となる。 Furthermore, since the injection hole for the packer and the hole for inserting the injection tube for the packer may be small in diameter, economical construction is possible.

また、パッカー用注入管、注入用細管、袋パッカー、さらに柱状浸透空間を形成する透水性被覆材が変形性と柔軟性に富んだ素材から形成されていることにより、コイル状に巻いて保管や移送が可能であり、またコイル状態を解きながら削孔内に挿入できる等の取り扱いが容易になる。 In addition, the packer injection tube, the injection capillary tube, the bag packer, and the water-permeable coating material that forms the columnar infiltration space are formed from a material that is highly deformable and flexible. It can be transferred, and handling such as being able to be inserted into the drilling hole while solving the coil state becomes easy.

さらに、パッカー用注入管と複数の注入用細管は、複数の結束具によってこれらの管軸方向に一定間隔おきに結束することにより結束注入管として構成されていることで、取り扱いやすいようになっている。また、各注入用細管の先端部、すなわち注入材吐出口にはゴムスリーブ等からなる逆止弁が取り付けられ、注入材が逆流しないようになっている。 Furthermore, the packer injection tube and the plurality of injection capillaries are configured as a bundled injection tube by being bound at regular intervals in the tube axis direction by a plurality of binding tools, thereby making it easy to handle. Yes. In addition, a check valve made of a rubber sleeve or the like is attached to the tip of each injection capillary, that is, the injection material discharge port, so that the injection material does not flow backward.

なお、パッカー用注入管と注入用細管は、ナイロン等の変形性と柔軟性に富んだ軟質性樹脂などからなるストレート管やコルゲート管などが適し、また袋パッカーは伸縮自在なゴム製や布製の袋が適している。 The packer injection tube and the injection tube are suitable for straight tube and corrugated tube made of flexible resin such as nylon, and the bag packer is made of elastic rubber or cloth. A bag is suitable.

また、例えば、図６に図示するように、パッカー用注入管と注入用細管をこれらの管軸方向に複数のパーツに形成し、各パーツはねじ式または差込み式のカップリングによって脱着自在に接続できるようにすることで、地盤の深さに応じて最適な長さとすることができる。また、保管や運搬等の際は分解してコンパクトに収容することもできる。 Also, for example, as shown in FIG. 6, the packer injection tube and the injection thin tube are formed into a plurality of parts in the tube axis direction, and each part is detachably connected by a screw type or insertion type coupling. By making it possible, the optimum length can be obtained according to the depth of the ground. Also, it can be disassembled and stored compactly during storage or transportation.

また、柱状浸透空間を形成する透水性被覆材は、注入液の吐出圧によって孔壁の周方向に伸びて表面積が増大するようなシート状に形成することで、孔壁との接触面積を大きくして注入液の浸透注入を効率的におこなうことができる。 In addition, the water-permeable coating material that forms the columnar infiltration space is formed in a sheet shape that extends in the circumferential direction of the hole wall due to the discharge pressure of the injected liquid and increases the surface area, thereby increasing the contact area with the hole wall. Thus, the osmotic injection of the injection solution can be performed efficiently.

この場合の透水性被覆材は、ゴムや合成樹脂、或いは布などの伸縮自在な透水性被覆シート等から形成されていればよい。また、透水性被覆材の表面にスリット等の切れ目を入れたシートまたは透水性被覆材として透水性マットを用いてもよいし、さらにそのマットの上にスリット等の切れ目を入れたシートで被覆してもよい。また、孔壁の周方向に波形状に連続する伸縮自在な蛇腹状のシートから形成されていてもよい(図７参照)。 In this case, the water-permeable covering material may be formed from a stretchable water-permeable covering sheet such as rubber, synthetic resin, or cloth. Further, a sheet having slits or the like cut on the surface of the water-permeable coating material or a water-permeable mat as the water-permeable coating material may be used, and further coated with a sheet having slits or the like cut on the mat. May be. Moreover, you may form from the elastically bellows-like sheet | seat continuous in a wave shape in the circumferential direction of a hole wall (refer FIG. 7).

これらの透水性被覆材は、各パッカー間の孔壁空間の長さが長くても、孔壁からの土砂の崩落による孔壁空間の減少を防ぎ、広い柱状浸透空間を維持することによって大きな吐出速度で低圧注入をすることが可能になる。 These water-permeable coatings prevent large holes from being lost due to the collapse of earth and sand from the hole walls, and maintain a large columnar penetration space even when the hole wall space between each packer is long. Allows low pressure injection at speed.

また、スリット等の切れ目を有する透水性被覆シートは、別の注入シテージからの注入液の柱状空間への浸入を防ぎ、各注入ステージごとに確実に孔壁周囲の地盤内に所定量の注入液を注入することができる。 In addition, the water-permeable coating sheet having slits and other cuts prevents the infusion from another infusion stage from entering the columnar space, and ensures that a predetermined amount of infusion in the ground around the hole wall for each infusion stage. Can be injected.

また、結束具に形成された嵌合溝は、結束具の周縁部にその円周方向に放射状に一定間隔おきに形成することにより、長い注入用細管を真横から押し込むだけで容易に結束することができ、また真横に引抜いて簡単に切り離すとことができるため、パッカー用注入管と注入用細管の結束作業を容易に行うことができる。 In addition, the fitting groove formed in the binding tool can be easily bundled by simply pushing a long injection capillary tube from the side by forming it radially in the circumferential direction of the binding tool at regular intervals. Moreover, since it can be pulled out to the side and easily separated, the packing operation of the packer injection tube and the injection thin tube can be easily performed.

勿論、パッカー用注入管に注入内管を挿入し、当該注入内管を通して各袋パッカーに充填液を充填することもできるが、この場合のパッカー用注入管の径は大きくなり、軟質の注入管では土圧で変形して注入内管を挿入しにくくなるので、硬質の注入管にする必要がある。 Of course, it is possible to insert an injection inner tube into the packer injection tube and fill each bag packer with the filling liquid through the injection inner tube. In this case, the diameter of the packer injection tube is increased, and the soft injection tube Then, since it becomes difficult to insert the injection inner tube due to deformation by earth pressure, it is necessary to make it a hard injection tube.

また、各パッカー内吐出口に充填液の逆流を防止するための逆止弁を取り付ける必要があるため、パッカー用充填液の充填作業が面倒になる上に、パッカー用注入管の構造が複雑になる。 In addition, since it is necessary to attach a check valve to prevent the backflow of the filling liquid at each packer discharge outlet, the filling work of the packing liquid for the packer becomes troublesome and the structure of the injection pipe for the packer is complicated. Become.

また、所定改良領域地盤内の複数の注入地点に上記の注入管装置をそれぞれ配置し、これらの注入管装置に注入液製造プラント、当該注入液製造プラントから各注入地点に注入液を送液する注入液送液ポンプ、複数の注入地点における複数のステージ(層)に同時にまたは各ステージごとに、あるいは注入すべきステージを任意に選択して注入液を送液する注入液分岐バルブ、各注入地点の袋パッカー内に充填されるパッカー用充填液を貯蔵した充填液貯蔵タンク、当該充填液貯蔵タンクから各注入地点の袋パッカー内に充填液を送液する充填液送液ポンプをそれぞれ接続し、さらにこれら注入液製造プラント、注入液送液ポンプ、注入液分岐バルブおよび充填液送液ポンプを集中管理する集中管理装置を配置することで、複数の注入地点において複数のステージに同時にまたはステージごとにあるいは注入ステージを任意に選択して注入液を注入することにより、きわめて効率的にかつ経済的に地盤改良を行うことができる。 In addition, the above injection pipe devices are arranged at a plurality of injection points in the ground of the predetermined improved region, respectively, and the injection liquid production plant is sent to these injection pipe devices, and the injection liquid is sent from the injection liquid production plant to each injection point. Injection liquid feed pump, injection liquid branch valve for sending the injection liquid to multiple stages (layers) at multiple injection points simultaneously or for each stage, or arbitrarily selecting the stage to be injected, each injection point A filling liquid storage tank for storing the filling liquid for the packer to be filled in the bag packer, and a filling liquid feeding pump for feeding the filling liquid from the filling liquid storage tank into the bag packer at each injection point, respectively, In addition, a central control device that centrally manages these infusion liquid production plant, infusion liquid feed pump, infusion liquid branching valve, and filling liquid liquid feed pump is arranged at multiple injection points. By injecting arbitrarily selected and infusate simultaneously or alternatively injection stage every stage in a plurality of stages Te, it can be carried out very efficiently and economically ground improvement.

また、各注入地点に送液される注入液の流路を切り換える流路切換えバルブと、各注入地点に送液される注入液の流量および／または圧力を計測する流量・圧力計測装置と、各注入地点における注入液の注入状況を一括監視する監視装置と、各注入地点における注入液の注入に伴う地盤変位を測定する地盤変位測定装置を接続し、かつ前記流路切換えバルブ、流量・圧力計測装置および地盤変位測定装置を制御する集中管理装置を配置することにより、注入地点を地盤の鉛直方向および水平方向へと移動しながら所定改良領域の地盤に対して三次元的にかつ安全に地盤注入を行うことができる。 In addition, a flow path switching valve for switching the flow path of the infusion solution sent to each injection point, a flow rate / pressure measuring device for measuring the flow rate and / or pressure of the infusion solution sent to each injection point, Connected to a monitoring device that collectively monitors the injection state of the injection solution at the injection point and a ground displacement measurement device that measures the ground displacement accompanying the injection of the injection solution at each injection point, and the flow path switching valve, flow rate / pressure measurement By placing a central control device that controls the device and the ground displacement measuring device, the ground injection can be safely and three-dimensionally performed on the ground in a predetermined improvement area while moving the pouring point in the vertical and horizontal directions of the ground. It can be performed.

また、流量・圧力計測装置によって各注入地点の流量と注入圧をリアルタイムで計測監視しながら複数の注入地点に必要量の注入液を同時にまたは適宜選択して注入することができ、さらに地盤変位計測装置によって注入に伴う注入地点の地盤の隆起等をリアルタイムで監視しながら注入することにより地上構造物や地下埋設物の不同沈下などを未然に防止することができ、作業の安全性も担保できる。 In addition, while measuring and monitoring the flow rate and pressure at each injection point in real time using a flow rate / pressure measurement device, the required amount of injection solution can be injected into multiple injection points simultaneously or appropriately, and ground displacement measurement is also possible. By injecting the device while monitoring in real time the rise of the ground at the injection point associated with the injection by the device, it is possible to prevent the subsidence of the ground structure and the underground buried object in advance and to ensure the safety of the work.

本発明によれば、削孔内に複数の柱状浸透空間を削孔方向に複数層に形成し、当該複数の柱状浸透空間に注入用細管を通して地上から注入液を送り込み、各柱状浸透空間から複数の注入ステージ（層）に同時にまたはステージごとに、あるいは注入すべきステージを任意に選択して注入液を注入することにより、地盤状況が層ごとに異なる地盤に対して最適量の注入液を注入して効率的にかつ経済的に地盤改良を行うことができる。 According to the present invention, a plurality of columnar penetration spaces are formed in a plurality of layers in the drilling direction in the drilling direction, and an injection solution is fed into the plurality of columnar penetration spaces from the ground through an injection capillary, and a plurality of columnar penetration spaces are formed from each columnar penetration space. By injecting the injection solution to the injection stage (layer) at the same time or every stage, or by arbitrarily selecting the stage to be injected, the optimal amount of injection solution is injected into the ground where the ground conditions differ from layer to layer As a result, the ground can be improved efficiently and economically.

また、削孔の径を小さくすることができるため、削孔機械(ボーリングマシン等)は小型のものでよく、また掘削残土の排出量も少なくなり、経済的、かつ効率的に地盤注入を行うことができる。 In addition, since the diameter of the drilling hole can be reduced, the drilling machine (boring machine, etc.) may be small, and the amount of discharged excavated soil will be reduced, making it possible to inject the ground economically and efficiently. be able to.

また、パッカー用注入管、注入用細管、袋パッカーおよび柱状浸透空間は結束注入管として一体に構成され、しかもコイル状に巻けるように構成されていることから、取り扱いが容易で作業性がよく、また運搬、保管などの取り扱いも容易になる。 The packer injection tube, injection thin tube, bag packer, and columnar infiltration space are configured integrally as a bundled injection tube, and are configured to be wound in a coil shape, so that handling is easy and workability is good. In addition, handling such as transportation and storage becomes easy.

さらに、一本のパッカー用注入管を介して複数の袋パッカーにパッカー充填液を連続的に充填することにより、複数の袋パッカーを膨張させて複数の柱状空間を形成した後、複数の注入用細管を介し、複数の柱状浸透空間から孔壁周囲の地盤中に注入液を同時注入することにより、各柱状浸透空間からの低圧注入により大きな吐出量で土粒子間浸透を可能にして、地盤改良をきわめて効率的かつ経済的に行うことができる。 Furthermore, by sequentially filling a plurality of bag packers with a packer filling liquid via a single packer injection tube, a plurality of bag packers are expanded to form a plurality of columnar spaces, and then a plurality of injections are performed. Immediately injecting the injection solution into the ground around the hole wall from a plurality of columnar infiltration spaces through narrow tubes, enabling low-pressure injection from each columnar infiltration space to enable infiltration between soil particles with a large discharge rate, improving the ground Can be done very efficiently and economically.

本発明に係る注入管装置の一実施形態を示し、図1(a)は削孔内に設置されたパッカー用注入管、注入用細管、袋パッカーおよび柱状浸透空間を示す縦断面図、図1(b)、図1(c)は図1(a)におけるイ−イ線断面図、ロ−ロ線断面図である。FIG. 1 (a) shows an embodiment of an injection tube device according to the present invention, and FIG. 1 (a) is a longitudinal sectional view showing an injection tube for a packer, an injection thin tube, a bag packer and a columnar infiltration space installed in a drilling hole, FIG. FIGS. 1B and 1C are a cross-sectional view taken along the line II and a cross-sectional view taken along the roll line in FIG. 図1においてパッカー用注入管を介して袋パッカー内にパッカー用充填液を注入する方法を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a method for injecting a packer filling liquid into a bag packer via a packer injection tube in FIG. 図1において注入用細管を介して柱状浸透空間から地盤に注入液を注入する方法を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a method of injecting an injection solution from a columnar infiltration space into the ground via an injection thin tube in FIG. 結束具を示し、図4(a)はその側面図、図4(b),(c),(d)はその平面図である。FIG. 4 (a) is a side view thereof, and FIGS. 4 (b), (c), and (d) are plan views thereof. パッカー用注入管と複数の注入用細管の上端部分を示す側面図である。It is a side view which shows the upper end part of the injection tube for packers and several thin tubes for injection. 複数のパーツにユニット化され、袋パッカー、柱状浸透空間、透水性被覆材および結束具と一体に組み立てられたパッカー用注入管と注入用細管を示す側面図である。It is a side view which shows the injection tube for packers and the thin tube for injection which were unitized by several parts and assembled integrally with the bag packer, columnar osmosis | permeation space, a water-permeable coating | covering material, and a binding tool. 柱状浸透空間の変形例を示す図1(a)におけるロ−ロ線断面図である。FIG. 2 is a cross-sectional view taken along the line of FIG. 1 (a) showing a modification of the columnar penetration space. 巻取り装置を示す側面図である。It is a side view which shows a winding apparatus. 本発明に係る注入装置の一実施形態を示す概略図である。It is the schematic which shows one Embodiment of the injection apparatus which concerns on this invention.

図１〜図６は、本発明の注入管装置の一実施形態を示し、図において、削孔Ａ内に一本のパッカー用注入管１と複数の注入用細管２がそれぞれ挿入され、また当該注入管1,2の管軸方向に複数の袋パッカー３と複数の柱状浸透空間４がそれぞれ設置されている。 1 to 6 show an embodiment of the injection tube device of the present invention. In the figure, one packer injection tube 1 and a plurality of injection thin tubes 2 are respectively inserted into the drilling holes A. A plurality of bag packers 3 and a plurality of columnar infiltration spaces 4 are respectively installed in the tube axis direction of the injection tubes 1 and 2.

パッカー用注入管１と注入用細管２は、共にナイロン樹脂などの柔軟性と変形性に富んだ軟質性樹脂材等からなるストレート管やコルゲート管などから形成されている。 The packer injection tube 1 and the injection thin tube 2 are both formed of a straight tube, a corrugated tube, or the like made of a soft resin material having high flexibility and deformability such as nylon resin.

また、パッカー用注入管１は、削孔Ａの中心部に地上から削孔Ａの一番深い位置に設置された袋パッカー３の位置まで連続して挿入され、複数の注入用細管２はパッカー用注入管１の周囲に削孔Ａの内周に沿って地上から各柱状浸透空間４の位置までそれぞれ連続して挿入されている。 The packer injection tube 1 is continuously inserted from the ground to the position of the bag packer 3 installed at the deepest position of the drilling hole A in the center of the drilling hole A. Around the injection pipe 1, it is continuously inserted from the ground to the position of each columnar penetration space 4 along the inner periphery of the hole A.

また、パッカー用注入管１は、当該注入管１の周壁に形成されたパッカー内吐出口1aを介して各袋パッカー３内に連通し、各注入用細管２の先端は各柱状浸透空間４内に挿入されて各柱状浸透空間４内に連通している。 The packer injection tube 1 communicates with each bag packer 3 via a discharge port 1a in the packer formed in the peripheral wall of the injection tube 1, and the tip of each injection thin tube 2 is in each columnar infiltration space 4. Inserted into the columnar permeation spaces 4.

さらに、各注入用細管２の先端部には地盤注入液の逆流を防止するための逆止弁５が取り付けられている。逆止弁５はゴムチューブ等から形成されている。 Further, a check valve 5 for preventing the backflow of the ground injection solution is attached to the tip of each injection thin tube 2. The check valve 5 is formed from a rubber tube or the like.

また、一本のパッカー用注入管１と複数の注入用細管２、さらに浸透性被覆材４は、複数の結束具６を介して管軸方向に一定間隔おきに脱着自在に結束されており、これにより削孔Ａ内には一本のパッカー用注入管１と複数の注入用細管２、さらに複数の袋パッカー３と柱状浸透空間４を備えて構成された結束注入管７が挿入されている。 In addition, one packer injection tube 1, a plurality of injection thin tubes 2, and a permeable coating material 4 are detachably bound at regular intervals in the tube axis direction via a plurality of binding tools 6. As a result, in the drilling hole A, a single packer injection tube 1 and a plurality of injection thin tubes 2, and a bundle injection tube 7 having a plurality of bag packers 3 and a columnar infiltration space 4 are inserted. .

結束具６は金属製でもよく、またパッカー用注入管１および注入用細管２と同様に合成樹脂などの軟質性樹脂材から形成され、また短い円柱状に形成され、その中心部にはパッカー用注入管１が貫通する貫通孔6aが形成されていてもよい。また、結束具６の周縁部には注入用細管２が嵌め込まれる嵌合溝6bが円周方向に放射状に一定間隔おきに複数形成されている。 The tying member 6 may be made of metal, and is formed of a soft resin material such as a synthetic resin as in the case of the packer injection tube 1 and the injection thin tube 2, and is formed in a short columnar shape with a central portion for the packer. A through hole 6a through which the injection tube 1 passes may be formed. Further, a plurality of fitting grooves 6b into which the injection thin tubes 2 are fitted are formed in the peripheral portion of the binding tool 6 at regular intervals radially in the circumferential direction.

なお、嵌合溝6bは注入用細管２を真横から押し込むだけで簡単に結束でき、かつ簡単に引き抜けるように上下方向に連続する溝状に形成されている。また嵌合溝6bは注入管２が誤って外れないように開口端部が注入管２の外径よりやや狭く形成されている。 The fitting groove 6b is formed in a groove shape that is continuous in the vertical direction so that it can be easily bundled by simply pushing the injection thin tube 2 from the side and pulled out easily. Further, the fitting groove 6b is formed so that the opening end is slightly narrower than the outer diameter of the injection tube 2 so that the injection tube 2 is not accidentally detached.

また、削孔Ａが深くなるに伴い注入用細管２の本数が徐々に少なくなることにより、結束具６の外径は削孔Ａが深くなるにつれて徐々に小径となり、また嵌合溝6bの個数も少なくなっている(図1(a),図４(b)〜(d))。 Further, as the number of the injection capillaries 2 gradually decreases as the hole A becomes deeper, the outer diameter of the tying member 6 gradually becomes smaller as the hole A becomes deeper, and the number of the fitting grooves 6b. (Fig. 1 (a), Fig. 4 (b) to (d)).

さらに、パッカー中央の貫通孔6aも嵌合溝6bと同様の形状に形成することにより、パッカー用注入管１の挿着も容易に行なうことができる。 Further, by forming the through hole 6a in the center of the packer in the same shape as the fitting groove 6b, the packer injection tube 1 can be easily inserted.

袋パッカー３は、ゴム製または布製袋などの伸縮自在でかつ柔軟性に富んだ袋から形成され、注入管1,2の管軸方向に一定間隔おきに、すなわち各結束具6,6間に設置され、かつその上下両端部は結束具６の外周面に密閉状態に接着されている。 The bag packer 3 is formed from a stretchable and flexible bag such as a rubber or cloth bag, and is arranged at regular intervals in the direction of the tube axis of the injection pipes 1 and 2, that is, between the binding tools 6 and 6. The upper and lower end portions are installed and adhered to the outer peripheral surface of the binding tool 6 in a sealed state.

そして、袋パッカー３はパッカー用注入管１を介して地上からエア(窒素ガス等)または水、あるいはセメント懸濁液などのパッカー用充填液が注入されることにより、削孔Ａの一番深い位置に設置された袋パッカー３から順に、最上部の袋パッカー３まで孔壁を押圧するように膨張して削孔Ａ内に複数の孔壁空間８を複数層に形成する。 The bag packer 3 is filled with the packing liquid for packer such as air (nitrogen gas, etc.), water, or cement suspension from the ground through the packer injection tube 1, so that the deepest hole A is formed. The plurality of hole wall spaces 8 are formed in a plurality of layers in the hole A by expanding so as to press the hole wall to the uppermost bag packer 3 in order from the bag packer 3 installed at the position.

柱状浸透空間４は、各袋パッカー3,3間に孔壁に沿って透水性被覆材4aをパッカー用注入管１および複数の注入用細管２の周囲を覆うように取り付け、かつその上下両端部を上下結束具6,6の外周面に密閉した状態で接着することにより管軸方向に長い柱状の袋状に形成されている。また、結束具６を介して上下袋パッカー3,3に接続されている。 The column-shaped permeation space 4 is provided with a water-permeable covering material 4a between the bag packers 3 and 3 along the hole wall so as to cover the periphery of the packer injection tube 1 and the plurality of injection thin tubes 2, and its upper and lower ends. Is bonded to the outer peripheral surfaces of the upper and lower binding tools 6 and 6 in a sealed state to form a columnar bag shape that is long in the tube axis direction. Further, it is connected to the upper and lower bag packers 3 and 3 through a binding tool 6.

透水性被覆材4aは麻布やメッシュシート、あるいは全体に多数の小孔またはスリット等の切れ目を有するゴムシート、ビニールシート、さらには全体に多数の子孔を有する柔軟性と変形性に富んだ合成樹脂シート、繊維を素材とする透水性マット等から形成されている。 The water-permeable covering material 4a is linen or mesh sheet, or a rubber sheet or vinyl sheet having many small holes or slits as a whole, or a synthetic resin rich in flexibility and deformability having many small holes throughout. It is formed from a sheet, a water-permeable mat made of fiber, or the like.

なお、透水性被覆材4aの素材や網目、小孔、スリットの大きさは、注入される注入液の種類に応じて最適なものが選択されている。さらに、透水性被覆シート4aの内側に透水性マット９が設置されることもあり、また、孔壁空間８内にスリーブグラウトが充填されることもある。スリーブグラウトには低強度のスラリー等が使用される。 The material, mesh, small holes, and slit sizes of the water-permeable covering material 4a are selected in accordance with the type of injected liquid to be injected. Furthermore, the water-permeable mat 9 may be installed inside the water-permeable covering sheet 4a, and the hole wall space 8 may be filled with a sleeve grout. A low strength slurry or the like is used for the sleeve grout.

また、砂礫地盤などでは柱状浸透空４から孔壁周囲の地盤中に瞬結グラウトや懸濁型などの一次注入材を注入して粗詰め注入を行ってから溶液型注入液などによる二次注入を行うことができるし、一次注入材と二次注入材は別々のステージから注入することもできる。 In addition, in the gravel ground, etc., the primary injecting material such as instantaneous grouting and suspension type is injected into the ground around the hole wall from the column-shaped infiltration sky 4, and then the coarse filling is injected, followed by the secondary injection by the solution-type injecting liquid or the like. The primary injection material and the secondary injection material can be injected from separate stages.

このような構成において、各注入用細管２を介して各柱状浸透空間４に地盤注入液が送り込まれると、注入液は各柱状浸透空間４の透水性被覆材4aを透過し、孔壁空間８を経て孔壁周囲の地盤中に浸透注入される。この場合、注入液は大きな柱状浸透空間４の周壁、すなわち透水性被覆材4aから孔壁空間８を通り孔壁周囲の地盤中に低圧注入により大きな吐出量で土粒子間浸透される。 In such a configuration, when the ground injection solution is sent into each columnar infiltration space 4 via each injection capillary 2, the injection solution passes through the water-permeable covering material 4 a of each columnar infiltration space 4, and the hole wall space 8. It is infused into the ground around the hole wall. In this case, the injected solution is infiltrated between the soil particles with a large discharge amount by low pressure injection from the peripheral wall of the large columnar infiltration space 4, that is, from the water-permeable coating material 4a through the hole wall space 8 into the ground around the hole wall.

なお、パッカー用注入管１と複数の注入用細管２は、一定長さ毎にパーツ化され、各パーツはねじ式または差込式の継手を介して脱着自在に接続可能なように形成されていてもよい。 The packer injection tube 1 and the plurality of injection thin tubes 2 are made into parts for each fixed length, and each part is formed so as to be detachably connectable via a screw-type or plug-in joint. May be.

特に、図６に図示するように、パッカー用注入管１と複数の注入用細管２と透水性被覆材4aが各結束具６の位置でパーツ化され、各袋パッカー３内に設置されるパーツは注入細管２のパーツと共に袋パッカー３および上下の結束具6,6と一体に形成され、各柱状浸透空間４内に設置されるパーツは注入細管２のパーツと共に周囲の透水性被覆材4aと一体に形成されていれば、注入管装置の組み立てをきわめて効率的に行うことができる。 In particular, as shown in FIG. 6, a packer injection tube 1, a plurality of injection thin tubes 2, and a water-permeable covering material 4 a are made into parts at the position of each binding tool 6, and are installed in each bag packer 3. Is formed integrally with the bag packer 3 and the upper and lower ties 6 and 6 together with the parts of the injection capillary 2, and the parts installed in each columnar infiltration space 4 together with the parts of the injection capillary 2 and the surrounding water-permeable covering material 4a If formed integrally, the assembly of the injection tube device can be performed very efficiently.

また、柱状浸透空間４の透水性被覆材4aが伸縮自在なゴムシートまたは、図７に図示するような波形状(蛇腹状)のシートから形成してあれば、注入液の吐出圧によって削孔Ａの周方向に伸びながら孔壁を周囲に押しやるように拡径して表面積が増大することにより、より多くの注入液を孔壁周囲の地盤中にきわめて効率的に浸透注入させることができる。 Further, if the water-permeable covering material 4a of the columnar infiltration space 4 is formed of a stretchable rubber sheet or a corrugated sheet as shown in FIG. By expanding the diameter so as to push the hole wall to the periphery while extending in the circumferential direction of A and increasing the surface area, it is possible to infiltrate and inject a larger amount of the injected solution into the ground around the hole wall very efficiently.

このような構成において、地上からパッカー用注入管１内にエアまたは水、あるいはセメント懸濁液などのパッカー用充填液を送り込むと、これらのエアまたは充填液はパッカー内吐出口1aを介して各袋パッカー３内に充填される。 In such a configuration, when air or water or a packing liquid for packing such as a cement suspension is sent from the ground into the packing tube 1 for packing, each of these air or filling liquids flows through the discharge port 1a in the packer. The bag packer 3 is filled.

そして、削孔Ａ内の一番深い位置の袋パッカー３から上方に順に削孔Ａ内で孔壁を周囲に押しやるように徐々に膨張する。これにより削孔Ａ内の各袋パッカー3,3間に孔壁空間８が形成される。 And it expand | swells gradually so that a hole wall may be pushed in the periphery in the hole A in order from the bag packer 3 of the deepest position in the hole A. Thus, a hole wall space 8 is formed between the bag packers 3 and 3 in the hole A.

次に、地上から各注入用細管２内に浸透性の地盤注入液を送り込むと、注入液は各注入用細管２の先端部に設けられた吐出口から各柱状浸透空間４内に吐出される。そして、各柱状浸透空間４から孔壁空間８を通って孔壁周囲の地盤中に浸透注入される。 Next, when a permeable ground injection solution is fed into the injection thin tubes 2 from the ground, the injection solution is discharged into the columnar infiltration spaces 4 from the discharge ports provided at the distal ends of the injection thin tubes 2. . Then, each columnar infiltration space 4 passes through the hole wall space 8 and is injected into the ground around the hole wall.

なお、結束注入管７の保管や移送は、図８に図示するような巻取り装置Ｂのドラムにコイル状に巻いて行なわれ、また、結束注入管７を削孔Ａ内に挿入する作業も巻取り装置Ｂによって行なわれる。 The bundling injection tube 7 is stored and transported by being wound around the drum of a winding device B as shown in FIG. 8 in the form of a coil, and the operation of inserting the bundling injection tube 7 into the hole A is also performed. This is done by the winding device B.

この場合、パッカー用注入管１、注入用細管２、袋パッカー３および透水性被覆材4aなどの結束注入管７の構成部材が、いずれもナイロン樹脂やゴム等の柔軟性と変形性に富んだ素材から形成されていることにより、これらの部材はほぼ扁平な帯状の状態で巻取り装置Ｂのドラムにコイル状に巻き取られる。 In this case, the constituent members of the bundle injection tube 7 such as the packer injection tube 1, the injection thin tube 2, the bag packer 3 and the water-permeable covering material 4a are all rich in flexibility and deformability such as nylon resin and rubber. By being formed from a raw material, these members are wound in a coil shape around the drum of the winding device B in a substantially flat belt-like state.

図９は、本発明に係る注入装置の一実施形態を示し、所定改良領域地場内の複数の注入地点に図１〜図６で説明した注入管装置が配置されている。 FIG. 9 shows an embodiment of the injection device according to the present invention, and the injection tube devices described in FIGS. 1 to 6 are arranged at a plurality of injection points in the predetermined improved region.

すなわち、各注入地点に形成された削孔Ａ内に一本のパッカー用注入管１と複数の注入用細管２がそれぞれ挿入され、その周囲に複数の袋パッカー３と複数の柱状浸透空間４が設置され、これにより各削孔Ａ内に結束注入管７がそれぞれ挿入されている。 That is, one packer injection tube 1 and a plurality of injection thin tubes 2 are respectively inserted into the drilling holes A formed at the respective injection points, and a plurality of bag packers 3 and a plurality of columnar infiltration spaces 4 are formed around it. Thus, the bundling injection pipe 7 is inserted into each hole A.

また、各注入地点のパッカー用注入管１には各袋パッカー３に送り込まれる水や懸濁液などのパッカー用充填液が貯蔵されたパッカー用充填液貯蔵タンク10と、当該充填材貯蔵タンク10内のパッカー用充填液を各袋パッカー３に送り込むためのパッカー用充填液送液ポンプ11、さらに各パッカー用注入管１へのパッカー用充填液の流路を開閉する流路切替えバルブ19が送液管12を介してそれぞれ接続されている。そして、流路切替えバブ19によって各パッカー用注入管１にパッカー用充填液が順次送液される。 In addition, the packer injection tube 1 at each injection point has a packer filling liquid storage tank 10 in which packer filling liquid such as water and suspension sent to each bag packer 3 is stored, and the filler storage tank 10. The packer filling liquid feed pump 11 for feeding the packer filling liquid into each bag packer 3 and the flow path switching valve 19 for opening and closing the flow path of the packer filling liquid to each packer injection pipe 1 are sent. Each is connected via a liquid pipe 12. Then, the packer filling liquid is sequentially sent to each of the packer injection pipes 1 by the flow path switching bubbs 19.

また、各注入地点の注入用細管２には地盤に注入される注入液を製造するための注入液製造プラント13、当該プラント13から各注入地点に注入液を送り込むための注入液送液ポンプ14がそれぞれ送液管15を介して接続されている。 Further, an injection liquid manufacturing plant 13 for manufacturing an injection liquid to be injected into the ground is injected into the injection thin tube 2 at each injection point, and an injection liquid feed pump 14 for sending the injection liquid from the plant 13 to each injection point. Are connected to each other via a liquid feeding pipe 15.

各注入地点の注入用細管２にはさらに、各注入地点の地盤に複数のステージ(層)に同時にまたは各ステージごと、あるいは注入すべきステージを任意に選択して最適量の注入液を送り込むための注入液分岐バルブ16が送液管15を介して接続されている。 In order to send an optimum amount of the injection solution to the injection capillary 2 at each injection point at the same time, at each stage, or for each stage, or at any stage to be injected. The injection liquid branch valve 16 is connected through a liquid supply pipe 15.

充填液送液ポンプ11、注入液送液ポンプ14および分岐バルブ16は各注入地点の注入管装置ごとに設置され、かつ各注入地点の注入管装置ごとに独立して作動するようにユニット化されている。 The filling liquid feeding pump 11, the infusion liquid feeding pump 14 and the branch valve 16 are installed for each infusion pipe device at each injection point, and are unitized so as to operate independently for each infusion pipe device at each injection point. ing.

また、充填液貯蔵タンク10、充填液送液ポンプ11、注入液製造プラント13、注入液送液ポンプ14および注入液分岐バルブ16にはこれらを集中的に管理するための集中管理装置17が信号ケーブ18を介して接続されている。 In addition, a central control device 17 for centrally managing these signals is provided to the filling liquid storage tank 10, the filling liquid feed pump 11, the infusate manufacturing plant 13, the infusate feeding pump 14, and the infusate branching valve 16. Connected via cave 18.

このような構成において、集中管理装置17において各注入地点の注入管装置への注入を制御することにより、複数の注入地点の地盤に最適量の注入液をステージごと、または複数のステージに同時に、あるいは注入すべきステージを任意に選択して注入することができる。 In such a configuration, by controlling the injection into the injection tube device at each injection point in the centralized management device 17, the optimal amount of injection solution on the ground of a plurality of injection points for each stage, or simultaneously on a plurality of stages, Alternatively, the stage to be injected can be arbitrarily selected and injected.

なお、各分岐バルブ16に洗浄用水を送り込むための送液管(図省略)が接続されている。これにより、各注入用細管２を介して各注入ステージに注入液を送液した後、洗浄水送液管を介して注入液分岐バルブ16に洗浄水を送液して注入液分岐バルブ16を洗浄することにより分岐バルブ16が詰まるのを防止することができ、また注入液を任意の注入用細管２に切り替えて連続的に注入することが可能になる。 A liquid supply pipe (not shown) for feeding cleaning water to each branch valve 16 is connected. As a result, after the injection solution is sent to each injection stage via each injection thin tube 2, the washing water is sent to the injection solution branch valve 16 via the washing water supply tube, and the injection solution branch valve 16 is turned on. By washing, it is possible to prevent the branch valve 16 from being clogged, and it is possible to continuously inject the injection liquid by switching to the arbitrary injection thin tube 2.

本発明は、特に地盤状況が層ごとに異なる地盤に対して、各層ごとまたは複数の層に最適量の注入液を同時にまたは任意に選択して注入することができ、また大きな柱状浸透空間からの低圧注入により各層毎に大きな吐出量で土粒子間浸透を行うことができ、これにより注入工法による液状化対策や地盤改良をきわめて効率的かつ経済的に行うことができる。 The present invention is capable of injecting an optimal amount of injection solution into each layer or a plurality of layers simultaneously or arbitrarily, particularly for the ground having different ground conditions for each layer, and from a large columnar infiltration space. By low-pressure injection, it is possible to infiltrate between the soil particles with a large discharge amount for each layer, which makes it possible to perform liquefaction countermeasures and ground improvement by the injection method very efficiently and economically.

Ａ削孔
Ｂ巻取り装置
１パッカー用注入管
1a パッカー内吐出口
２注入細管
３袋パッカー
４柱状浸透空間
4a 透水性被覆材
５逆止弁
６結束具
6a 貫通孔
6b 嵌合溝
７結束注入管
８孔壁空間
９透水性マット
10 パットカー用充填材貯蔵タンク
11 パッカー用充填液送液ポンプ
12 送液管
13 注入液製造プラント
14 注入液送液ポンプ
15 送液管
16 分岐バルブ（注入液分岐バルブ）
17 集中管理装置
18 信号ケーブル
19 流路切替えバルブ A Drilling hole B Winding device 1 Packer injection tube
1a Packer outlet 2 Injection capillary 3 Bag packer 4 Columnar penetration space
4a Water-permeable coating 5 Check valve 6 Binder
6a Through hole
6b Fitting groove 7 Bundling injection pipe 8 Hole wall space 9 Permeable mat
10 Filler storage tank for police cars
11 Packing liquid feed pump for packers
12 Liquid feeding pipe
13 Injection plant
14 Injection pump
15 Liquid supply pipe
16 Branch valve (Injected solution branch valve)
17 Centralized management device
18 Signal cable
19 Flow path switching valve

Claims

One packer injection tube and a plurality of injection capillaries installed in parallel in the tube axis direction and inserted into the drilling hole , and a plurality of binding tools for binding the packer injection tube and the plurality of injection capillaries A plurality of bag packers installed at intervals in the tube axis direction of the packer injection tube and the plurality of injection thin tubes, and a plurality of columnar infiltration spaces installed between the bag packers. A tube is continuously installed between a plurality of bag packers, and communicates with each bag packer through a discharge port in the packer formed on the peripheral wall of the packer injection tube. In communication with the space, the plurality of bag packers are expanded in order from the packer at the deepest position to the shallowest position at the shallowest position by the packer filling liquid injected through the packer injection tube. Sharpening The columnar infiltration space is formed by installing a water-permeable covering material so as to cover the periphery of the injection tube for packer and the thin tube for injection between each bag packer, and The injection solution injected through the injection thin tube is configured to be injected into the ground from the entire periphery of the drilling wall through the water-permeable covering material in the columnar infiltration space between the plurality of bag packers. Infusion tube device.

In injection tube apparatus according to claim 1, packer for injection tube, the injection capillary, the bag packer and permeable dressings, infusion tube, characterized that you have been formed from rich deformability and flexibility Material apparatus.

3. The injection tube device according to claim 1 or 2, wherein the tying member includes a through hole through which the injection tube for packer penetrates in a central portion and a plurality of fitting grooves in which the injection thin tubes are fitted in a peripheral portion. An injection tube device, characterized in that it is formed.

The injection tube device according to any one of claims 1 to 3, wherein the columnar infiltration space is formed such that the surface area is increased by expanding the diameter of the water-permeable coating material in the circumferential direction by the discharge pressure of the injection liquid. An infusion tube device characterized by being made.

The injection tube device according to any one of claims 1 to 4, wherein the water-permeable covering material is formed of a water-permeable mat or a water-permeable sheet that covers the water-permeable mat and the water-permeable mat. Infusion tube device.

One packer injection tube and a plurality of injection thin tubes, which are installed in parallel in the tube axis direction and inserted into each drilling hole formed at a plurality of injection points in the predetermined improved region ground, the packer A plurality of binding tools for binding the injection tube and the injection thin tube, a plurality of bag packers installed at intervals in the tube axis direction of the packer injection tube and the injection thin tube, and each bag packer. A plurality of columnar infiltration spaces , an infusion liquid production plant for producing an infusion liquid to be injected into each injection point, and a plurality of infusion liquid feed pumps for sending the infusion liquid from the infusion liquid production plant to each injection point, the infusion branch valve for injecting a plurality of injection stages simultaneously, or one or more of the injection stage by selecting injectate at each injection point, centralized operation of the infusion pump and the injection fluid branch valve Comprising a central control device for the packer for injection tube is installed consecutively between a plurality of bags packers, and respectively communicate via Kakufukuro packer and peripheral wall formed packer within the discharge port of the packer for filling tube The plurality of injection thin tubes communicate with each columnar infiltration space, and the plurality of bag packers are removed from the bag packer at the deepest position of the hole by the packer filling liquid injected through the packer injection tube. It is installed so as to expand to the shallowest bag packer in order and press the hole wall of the drilling hole, and the columnar infiltration space covers the periphery of the packer injection tube and the injection thin tube between each bag packer The infusate formed by installing the water-permeable coating material and injected through the injection tubule passes through the water-permeable coating material in the columnar permeation space between the plurality of bag packers. Injection tube apparatus characterized by being configured to be implanted into the ground from.

7. The injection tube device according to claim 6, wherein the flow rate switching valve for switching the flow path of the injection liquid to be sent to each injection point and the flow rate and / or pressure of the injection liquid to be sent to each injection point are measured. A flow rate / pressure measurement device and a monitoring device that collectively monitors the injection state of the injection solution at each injection point, and the flow path switching valve and the flow rate / pressure measurement device are controlled by a centralized management device. Injection tube device to do.

8. The injection tube device according to claim 6, further comprising a ground displacement measuring device for measuring a ground displacement associated with injection of the injection liquid at each injection point.

The injection method using the injection tube device according to any one of claims 6 to 8 , wherein one packer injection tube and a plurality of injections are formed in each of the drill holes formed at a plurality of injection points in the predetermined improved region ground. Capillary tube, a plurality of binding devices for binding the packer injection tube and the injection capillary tube, a plurality of bag packers disposed at intervals in the tube axis direction of the packer injection tube and the injection capillary tube, and the bags By inserting a water-permeable coating material that forms a plurality of columnar infiltration spaces respectively installed between the packers, and injecting the packing liquid for the packers into the respective bag packers at the respective injection points via the packer injection pipes. The bag packer is inflated, and the entire perimeter of the drilling wall is passed through the water-permeable covering material in the columnar penetration space between the plurality of bag packers by injecting the injection material into the columnar penetration space at each injection point through the injection capillary. Or It poured into ground, and injecting injection method, characterized by injecting simultaneously or select one or more injection stages to a plurality of injection stages in each injection point through the branch valve.

The injection method according to claim 9, wherein the injection method is injected into a plurality of injection points simultaneously or by selecting one or a plurality of injection points .