JP4583263B2 - Chemical injection pipe and chemical injection method - Google Patents

Chemical injection pipe and chemical injection method Download PDF

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JP4583263B2
JP4583263B2 JP2005201249A JP2005201249A JP4583263B2 JP 4583263 B2 JP4583263 B2 JP 4583263B2 JP 2005201249 A JP2005201249 A JP 2005201249A JP 2005201249 A JP2005201249 A JP 2005201249A JP 4583263 B2 JP4583263 B2 JP 4583263B2
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JP2007016536A (en
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隆夫 島村
隆善 松永
佐藤  淳
徳生 小佐田
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Obayashi Corp
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本発明は、地盤改良に用いられる薬液注入管及び薬液注入工法に関するものである。   The present invention relates to a chemical injection pipe and a chemical injection method used for ground improvement.

シールド工法の地盤沈下は、「先行沈下」、「テールボイド沈下」及び「後続沈下」の3種類に大別される。   The ground subsidence of the shield method is roughly classified into three types: “preceding subsidence”, “tail void subsidence”, and “subsequent subsidence”.

このうち、先行沈下及びテールボイド沈下は、シールド機先端の切羽圧力の制御方法、同時裏込注入工法等の技術進歩により、シールド掘削時にその対策がなされている。   Among these, the preceding settlement and tail void settlement have been taken countermeasures during shield excavation due to technological advances such as the method of controlling the face pressure at the tip of the shield machine and the simultaneous backfill injection method.

一方、後続沈下は、シールド機通過後に発生する。シールド機通過後の沈下は、土質条件にもよるが、特に軟らかい粘性土の場合には、シールド機の通過後2〜3日で最終沈下の70〜80%に達し、その後、1〜2ヶ月までに最終沈下に至ることが知られている。   On the other hand, the subsequent settlement occurs after passing through the shield machine. Subsidence after passing the shield machine depends on the soil conditions, but in the case of soft, viscous soil, it reaches 70 to 80% of the final settlement in 2 to 3 days after passing through the shield machine. It is known that the final settlement will occur.

そこで、シールド機通過後、セグメント内の被圧水環境から地山の削孔及び注入を行って地山を強化する薬液注入工法が実施される。   Therefore, after passing through the shield machine, a chemical injection method for strengthening the natural ground by drilling and injecting natural ground from the pressurized water environment in the segment is performed.

薬液注入工法としては、薬液注入管から削孔水を噴出させると共に薬液注入管に装着されたビットを回転させることによって削孔を行い、削孔完了後は、削孔水から注入薬液に変更して該注入薬液を地山に浸透させ、また、薬液注入管を削孔から引き抜く方向に所定距離だけ移動させて更に注入薬液を浸透させ、この作業を繰り返すことにより地盤改良を行うようにしている。   As the chemical injection method, drilling water is spouted from the chemical injection pipe and the bit attached to the chemical injection pipe is rotated, and after the drilling is completed, the hole water is changed to injection chemical. The medicinal solution is infiltrated into the ground, and the medicinal solution injection tube is moved by a predetermined distance in the direction of pulling out from the drilling hole to further infiltrate the injected medicinal solution, and the ground is improved by repeating this operation. .

しかしながら、地山の土砂崩壊等によって薬液注入管の吐出孔と地山との間にクリアランスが確保され難く、該クリアランスを通じた注入薬液の拡散が困難になって注入薬液の浸透むらが発生し、注入薬液の浸透領域も狭くなって地盤改良の信頼性が低下するという問題があった。また、薬液注入管の吐出孔から土砂が流入して目詰まりを起こし、薬液が薬液注入管内に逆流するという問題があった。   However, it is difficult to secure a clearance between the discharge hole of the chemical solution injection pipe and the natural mountain due to the earth and sand collapse of the natural ground, diffusion of the injected chemical solution through the clearance becomes difficult, and uneven penetration of the injected chemical solution occurs, There was a problem that the infiltration area of the injected drug solution was narrowed and the reliability of ground improvement was lowered. In addition, there is a problem that earth and sand flow from the discharge hole of the chemical solution injection tube, causing clogging, and the chemical solution flows back into the chemical solution injection tube.

また、かかる薬液注入管を用いた注入工法では、注入むらを補うために薬液注入管の間隔を狭めなければならないので、削孔本数が増加して施工性が低下し、工費が増加するという問題があった。   In addition, in the injection method using such a chemical injection pipe, the interval between the chemical injection pipes must be narrowed in order to compensate for uneven injection, so the number of drilling holes increases, workability decreases, and construction costs increase. was there.

そこで、本発明は、吐出孔と地山とが接することによる注入薬液の拡散不良を回避でき、また、土砂の流入や注入薬液の逆流を防止することができる薬液注入管、及び削孔本数の減少等により施工性を向上させることができる薬液注入工法を提供することを課題とする。   Therefore, the present invention can avoid the inadequate diffusion of the injected chemical liquid due to the contact between the discharge hole and the ground, and can prevent the inflow of earth and sand and the back flow of the injected chemical liquid, and the number of drilled holes. It aims at providing the chemical | medical solution injection construction method which can improve workability | operativity by reduction etc.

本発明者は、前記課題を解決するために鋭意研究を重ねて完成されたものである。
1.周壁部に注入薬液の吐出孔を有する管本体と、
前記吐出孔を覆うようにして前記管本体の外周面に設けられて前記注入薬液を拡散させる拡散層と、を備え、
前記管本体内に圧送された前記注入薬液を前記吐出孔から前記拡散層を介して地山に浸透させることを特徴とする薬液注入管を提供する。
2.前記拡散体は、通液性を有する基板上に芝材が植設された人工芝であることを特徴とする請求項1に記載の薬液注入管を提供する。
3.前記拡散体は、繊維構造体であることを特徴とする請求項1に記載の薬液注入管を提供する。
4.前記拡散層は、マット状の拡散体を前記管本体の外周面に巻設することにより形成されたことを特徴とする請求項1から3のいずれかに記載の薬液注入管を提供する。
5.前記拡散層を含む前記管本体部分の外径寸法よりも大きな外径寸法を有するビットを、前記管本体の先端に設けたことを特徴とする請求項1から4のいずれかに記載の薬液注入管を提供する。
6.シールド機により掘削した地山の覆工壁としてセグメントを組立設置し、薬液注入管を前記セグメントから前記地山中に圧入し、前記薬液注入管から前記地山に注入薬液を注入する薬液注入工法において、請求項1から5のいずれかに記載の薬液注入管を用い、前記覆工壁の周方向に適宜間隔を設けて複数の前記薬液注入管を配設し、複数の前記薬液注入管を前記セグメントから前記地山中に圧入し、薬液供給装置を用いて複数の前記薬液注入管の吐出孔から前記拡散層を介して前記地山に注入薬液を注入し、前記薬液注入管を埋め殺しにすることを特徴とする薬液注入工法を提供する。
7.前記薬液供給装置は、薬液タンクと、前記薬液タンクから前記薬液注入管に前記注入薬液を供給する薬液流路と、前記薬液流路を通じて前記薬液注入管に前記注入薬液を圧送するポンプと、前記薬液注入管に流入する注入薬液の圧力が所定圧力以下になるように制御する圧力制御手段と、備えたことを特徴とする請求項6記載の薬液注入工法を提供する。
8.前記圧力制御手段は、前記薬液注入管に流入する前記注入薬液の圧力を検知する圧力検知部と、前記圧力検知部の検知信号に基づいて前記ポンプを制御するコントローラと、を備えたことを特徴とする請求項7に記載の薬液注入工法を提供する。
9.前記圧力制御手段は、前記薬液注入管に流入する前記注入薬液の圧力を検知する圧力検知部と、比例電磁弁と、前記圧力検知部の検知信号に基づいて前記比例電磁弁を制御するコントローラと、を備えたことを特徴とする請求項7に記載の薬液注入工法を提供する。
10.複数の前記薬液注入管の吐出孔から前記地山に注入薬液を同時に注入することを特徴とする請求項6から9いずれかに記載の薬液注入工法を提供する。
11.複数の前記薬液注入管による薬液の注入量及び注入圧を一括管理することを特徴とする請求項6から10いずれかに記載の薬液注入工法を提供する。
The inventor of the present invention has been completed by earnest research to solve the above-mentioned problems.
1. A tube main body having a discharge hole for the injected medicinal solution on the peripheral wall,
A diffusion layer provided on the outer peripheral surface of the tube main body so as to cover the discharge hole and diffusing the injecting drug solution,
Provided is a chemical liquid injection tube, wherein the injected chemical liquid fed into the pipe body is infiltrated into the natural ground from the discharge hole through the diffusion layer.
2. 2. The chemical solution injection tube according to claim 1, wherein the diffuser is an artificial turf in which turf material is planted on a substrate having liquid permeability.
3. The chemical liquid injection tube according to claim 1, wherein the diffuser is a fiber structure.
4). 4. The chemical injection pipe according to claim 1, wherein the diffusion layer is formed by winding a mat-like diffuser around an outer peripheral surface of the pipe main body. 5.
5). 5. The chemical solution injection according to claim 1, wherein a bit having an outer diameter larger than an outer diameter of the tube main body portion including the diffusion layer is provided at a tip of the tube main body. Provide tube.
6). In the chemical injection method of assembling and installing a segment as a lining wall of a natural ground excavated by a shield machine, press-fitting a chemical injection pipe from the segment into the natural ground, and injecting an injection chemical into the natural ground from the chemical injection pipe The chemical solution injection pipe according to any one of claims 1 to 5, wherein a plurality of the chemical solution injection tubes are arranged at appropriate intervals in the circumferential direction of the lining wall, and the plurality of chemical solution injection tubes are arranged as described above. Press-fit into the natural ground from the segment, inject the injection chemical liquid into the natural ground through the diffusion layer from the discharge holes of the plurality of chemical injection pipes using a chemical supply device, and fill the chemical injection pipe Provided is a chemical injection method characterized by the above.
7). The chemical liquid supply device includes a chemical liquid tank, a chemical liquid flow path for supplying the injected chemical liquid from the chemical liquid tank to the chemical liquid injection pipe, a pump for pumping the injected chemical liquid to the chemical liquid injection pipe through the chemical liquid flow path, 7. The chemical solution injection method according to claim 6, further comprising pressure control means for controlling the pressure of the injected chemical solution flowing into the chemical solution injection pipe to be equal to or lower than a predetermined pressure.
8). The pressure control means includes a pressure detection unit that detects the pressure of the injected drug solution flowing into the drug solution injection pipe, and a controller that controls the pump based on a detection signal of the pressure detection unit. The chemical injection method according to claim 7 is provided.
9. The pressure control means includes a pressure detection unit that detects the pressure of the injected drug solution flowing into the drug solution injection pipe, a proportional solenoid valve, and a controller that controls the proportional solenoid valve based on a detection signal of the pressure detection unit; The chemical injection method according to claim 7 is provided.
10. The chemical injection method according to any one of claims 6 to 9, wherein injection chemicals are simultaneously injected into the ground from discharge holes of a plurality of chemical injection pipes.
11. The chemical injection method according to any one of claims 6 to 10, wherein the chemical injection amount and injection pressure by the plurality of chemical injection pipes are collectively managed.

本発明の薬液注入管によれば、周壁部に注入薬液の吐出孔を有する管本体と、前記吐出孔を覆うようにして前記管本体の外周面に設けらて前記注入薬液を拡散させる拡散層と、を備えたので、薬液注入管を地山に圧入し、注入薬液を薬液注入管に供給して該薬液注入管の吐出孔から注入薬液を流出させたときに、注入薬液が前記拡散層で拡散することによって管本体の外周面に万遍なく行き渡らせることができて地山への柱状浸透注入が可能になり、充分な注入区間を確保でき、地山への浸透むらがなくなり、地盤改良の信頼性を向上させることができ、また、ゲルタイムの長い長結性注入薬液を用いることによって注入浸透域を更に拡げることができる。   According to the chemical injection pipe of the present invention, a pipe main body having an injection chemical liquid discharge hole in the peripheral wall portion, and a diffusion layer that is provided on the outer peripheral surface of the pipe main body so as to cover the discharge hole and diffuses the injection chemical liquid When the chemical injection tube is press-fitted into the ground, the injected chemical solution is supplied to the chemical injection tube, and the injected chemical solution flows out from the discharge hole of the chemical injection tube, the injected chemical solution flows into the diffusion layer. It is possible to spread all over the outer peripheral surface of the pipe body by diffusing in, and it becomes possible to inject columnar infiltration into the natural ground, to secure a sufficient injection section, to eliminate uneven infiltration into the natural ground, and The reliability of the improvement can be improved, and the injection permeation region can be further expanded by using a long-acting injectable drug solution having a long gel time.

また、このように注入薬液を効率よく地山に注入することができるので、地山に作用する注入圧力を低く設定できて無理な注入圧を加える必要がないので、注入圧による地山の変位やセグメントの変状を防止することができ、また、注入作業の短縮化が図れる。   In addition, since the injected drug solution can be efficiently injected into the natural ground, the injection pressure acting on the natural ground can be set low and there is no need to apply excessive injection pressure. And the deformation of the segment can be prevented, and the injection work can be shortened.

また、前記拡散層を前記吐出孔を覆うようにして前記管本体の外周面に設けたので、薬液注入管の吐出孔からの土砂の流入や薬液の逆流を防止することができる。   In addition, since the diffusion layer is provided on the outer peripheral surface of the pipe body so as to cover the discharge hole, it is possible to prevent the inflow of earth and sand from the discharge hole of the chemical liquid injection pipe and the back flow of the chemical liquid.

また、薬液注入管一本当たりの注入薬液浸透域の増加によって削孔本数を減少させることができて施工性の向上し、テールボイドの継続的沈下に対する抑制効果が大きくなり、しかも、工費の節減が図れる。   In addition, the number of drilling holes can be reduced by increasing the injection chemical solution permeation area per chemical injection pipe, improving workability, increasing the effect of suppressing the continuous settlement of tail voids, and reducing the construction cost. I can plan.

また、前記拡散層を含む前記管本体部分よりも大きな外径寸法を有するビットを、前記管本体の先端に設ければ、薬液注入管を圧入する際に前記ビットによって前記拡散層を保護することができ、圧入時の前記拡散層の損傷を防ぐことができる。   Further, if a bit having a larger outer diameter than the tube main body portion including the diffusion layer is provided at the tip of the tube main body, the diffusion layer is protected by the bit when the chemical solution injection pipe is press-fitted. It is possible to prevent damage to the diffusion layer during press-fitting.

なお、前記拡散層を弾力性材料で形成すれば、前記拡散層のクッション効果によって、薬液注入管の拡散層への圧入時に発生する衝撃が地山に伝わるのを緩和でき、削孔壁の安定が図れる。   If the diffusion layer is formed of an elastic material, the cushioning effect of the diffusion layer can alleviate the impact generated when the chemical injection pipe is pressed into the diffusion layer from being transmitted to the natural ground, thereby stabilizing the drilling wall. Can be planned.

本発明の薬液注入工法によれば、前記1から7のいずれかに記載の薬液注入管を用いるので、薬液注入管一本当たりの注入浸透域が拡がることによって前記薬液注入管の設置間隔を拡げることが可能になり、その結果、削孔本数を減少させて施工性を向上させることができる。   According to the chemical injection method of the present invention, since the chemical injection pipe according to any one of 1 to 7 is used, the installation interval of the chemical injection pipes can be expanded by expanding the injection penetration area per chemical injection pipe. As a result, the number of drilled holes can be reduced and workability can be improved.

また、複数の前記薬液注入管の吐出孔から前記拡散層を介して前記地山に薬液を同時に注入すれば、短時間で注入工程を完了することができる。   Further, if the chemical solution is simultaneously injected into the natural ground from the discharge holes of the plurality of chemical solution injection tubes via the diffusion layer, the injection process can be completed in a short time.

また、薬液注入管を引く抜くことなく地山への柱状浸透注入が可能になるので、従来のように薬液注入管を削孔から引き抜きながら注入する作業が不要になり、施工性を向上させることができる。   In addition, columnar infusion injection into the natural ground is possible without pulling out the chemical injection pipe, so that the work of injecting the chemical injection pipe while pulling it out from the drilling hole becomes unnecessary and the workability is improved. Can do.

また、複数の前記薬液注入管による薬液の注入量及び注入圧を一括管理すれば、薬液注入管の管理負担を軽減できる。   Moreover, if the injection amount and the injection pressure of the chemical solution by the plurality of chemical solution injection tubes are collectively managed, the management burden of the chemical solution injection tube can be reduced.

以下、本発明に係る薬液注入管及び薬液注入工法の実施形態について図面を参照しつつ説明する。
図1のように薬液注入管Aは、管本体1を備え、注入薬液が浸透して拡散する弾力性を有する拡散層2が管本体1の外周面に形成され、管本体1の先端にはビット3が設けられている。
Hereinafter, embodiments of a chemical injection pipe and a chemical injection method according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the chemical injection pipe A includes a pipe main body 1, and a diffusion layer 2 having elasticity that allows the injected chemical liquid to permeate and diffuse is formed on the outer peripheral surface of the pipe main body 1. Bit 3 is provided.

管本体1は単管ボーリングロッドであり、周壁部11には略均等に分散するようにして多数の注入薬液の吐出孔12が穿設されている。なお、例えば管本体1の直径を33〜40.5mm、長さを1000mmとした場合には、直径6mmの吐出孔12を管本体1全体に38個設けるようにする。   The tube body 1 is a single tube boring rod, and a plurality of injection holes 12 for injecting drug solution are formed in the peripheral wall portion 11 so as to be distributed substantially evenly. For example, when the diameter of the tube body 1 is 33 to 40.5 mm and the length is 1000 mm, 38 discharge holes 12 having a diameter of 6 mm are provided in the entire tube body 1.

拡散層2は、拡散体4を管本体1の外周面に吐出孔12を覆うようにして巻装固定して形成されている。なお、管本体1への拡散体4の固定方法は、例えば図外の鋼製リングや針金を、拡散体4の上から管本体1に吐出孔12を避けた位置で巻設して行われる。   The diffusion layer 2 is formed by winding and fixing the diffuser 4 on the outer peripheral surface of the tube body 1 so as to cover the discharge hole 12. The diffusion body 4 is fixed to the pipe body 1 by, for example, winding a steel ring or a wire (not shown) from the top of the diffusion body 4 to the pipe body 1 at a position avoiding the discharge hole 12. .

拡散体4は、注入薬液が通過できる通液性基材4aの上に合成樹脂製の芝材4bを植設して成る人工芝である。そして、後述する薬液供給装置Cにより薬液注入管Aに圧送された注入薬液は、管本体1の吐出孔12から前記人工芝の基材4aを通って芝材4b間の隙間4cに入り、拡散体4中を拡散する。なお、注入薬液が注入圧力に加えて毛細管現象の助けを受けて拡散体4中を拡散するような材料、例えば拡散空隙率の高いへちま状の立体網目構造を有する繊維構造体により拡散体4を構成しても良い。   The diffuser 4 is an artificial turf formed by planting a synthetic resin turf material 4b on a liquid-permeable base material 4a through which an injectable drug solution can pass. Then, the injected medicinal solution pumped to the medicinal solution injecting tube A by the medicinal solution supplying device C described later enters the gap 4c between the turf materials 4b from the discharge hole 12 of the tube main body 1 through the base material 4a of the artificial turf and diffuses. It diffuses in the body 4. Note that the diffuser 4 is made of a material that allows the injected chemical solution to diffuse through the diffuser 4 with the aid of the capillary action in addition to the injection pressure, for example, a fiber structure having a flat three-dimensional network structure with a high diffusion porosity. It may be configured.

また、ビット3の最大径d1は、拡散層2を含む管本体1部分の外径寸法d2よりも大きくなるように設定されている。   In addition, the maximum diameter d1 of the bit 3 is set to be larger than the outer diameter d2 of the pipe body 1 including the diffusion layer 2.

次に、前記薬液注入管Aを用いたシールド掘削の裏込め注入工法(薬液注入工法)について説明する。
(1)図外のシールド機の前方に設けられたカッターヘッドで地山Bを掘削し、シールド機のテール部で覆工壁101としてセグメント102を順次組み立ててトンネルを支持する。また、図外のシールドジャッキにより既設のセグメント102を押圧し、セグメント102の反力でシールド機を推進させる。
(2)次に、覆工壁101の略上半分の領域に、かつ、覆工壁101の周方向に適宜間隔を設けて複数の薬液注入管Aを配設し、これらの薬液注入管Aをセグメント102から地山B中に無水打撃方式により削孔装置201を用いて圧入する。
Next, a backfill injection method (chemical solution injection method) for shield excavation using the chemical solution injection pipe A will be described.
(1) A natural head B is excavated by a cutter head provided in front of a shield machine (not shown), and segments 102 are sequentially assembled as a lining wall 101 at the tail part of the shield machine to support the tunnel. Further, the existing segment 102 is pressed by a shield jack (not shown), and the shield machine is driven by the reaction force of the segment 102.
(2) Next, a plurality of chemical solution injection pipes A are disposed in a substantially upper half region of the lining wall 101 and appropriately spaced in the circumferential direction of the lining wall 101, and these chemical solution injection pipes A are provided. Is pressed into the ground B from the segment 102 using the drilling device 201 by a waterless hitting method.

図2(a)のようにセグメント102には薬液注入管Aのフランジ付きの導入口103が設けられ、該導入口103に薬液注入管Aを案内する伸縮自在なガイド管104を取り付ける。ガイド管104の基端側の内周面には、基端管内周面と薬液注入管A外周面との隙間をシールするリング状シール部材105が取り付けられ、ガイド管104の先端側にはピンチバルブ109が着脱自在に連結される。また、セグメント102の導入口103には継ぎ手106を介してピンチバルブ109が取り付けられる。   As shown in FIG. 2A, the segment 102 is provided with a flanged introduction port 103 of the chemical solution injection tube A, and an extendable guide tube 104 for guiding the chemical solution injection tube A is attached to the introduction port 103. A ring-shaped seal member 105 that seals the gap between the inner peripheral surface of the proximal end tube and the outer peripheral surface of the chemical liquid injection tube A is attached to the inner peripheral surface on the proximal end side of the guide tube 104, and a pinch is attached to the distal end side of the guide tube 104. The valve 109 is detachably connected. A pinch valve 109 is attached to the inlet 103 of the segment 102 via a joint 106.

削孔装置201は、覆工壁101と略直交する方向に設置されるレール202と、レール202に沿って移動する打撃機203と、打撃機203をレール202に沿って移動させる押圧シリンダー204とを備えている。そして、削孔の際には、打撃機203をレール202に沿って移動させ、ガイド管104内に挿入された薬液注入管Aの基端を打撃機203によって打撃を加えて該薬液注入管Aを覆工壁101の背面側の地山Bに圧入して削孔する。また、削孔深さに応じて継ぎ足し用の薬液注入管A1を継ぎ足す。なお、薬液注入管A1にはビット3はなく、管本体の外周に上述の拡散体4で形成された拡散層を周設して形成されている。   The hole drilling device 201 includes a rail 202 installed in a direction substantially orthogonal to the lining wall 101, an impact machine 203 that moves along the rail 202, and a pressing cylinder 204 that moves the impact machine 203 along the rail 202. It has. When drilling, the hammer 203 is moved along the rail 202, and the base end of the chemical injection pipe A inserted into the guide tube 104 is struck by the hammer 203 to provide the chemical injection pipe A. Is drilled into the ground B on the back side of the lining wall 101. Further, the chemical injection pipe A1 for addition is added according to the drilling depth. The chemical solution injection pipe A1 does not have the bit 3, but is formed by surrounding the outer periphery of the pipe body with a diffusion layer formed of the above-described diffuser 4.

そして、図2(b)のように薬液注入管Aに打撃を加えて削孔を開始し、薬液注入管Aに薬液注入管A1を適宜継ぎ足して行く。継ぎ足す際には、図2(c)のようにピンチバルブ109を閉じ、打撃機203を後退させる。
(3)次に、地山Bに圧入された複数本の薬液注入管Aから地山Bに注入薬液を注入する。注入に際しては、図3(a)のようにガイド管104を取り外し、セグメント102の導入口103の口元を止水処理し、また、図3(b)のようにピンチバルブ109を継ぎ手106から取り外し、薬液注入管A1の基端部にバルブ110を介して薬液供給装置C(図4に示す。)の注入管107を連結する。
Then, as shown in FIG. 2 (b), the chemical solution injection tube A is hit to start drilling, and the chemical solution injection tube A1 is added to the chemical solution injection tube A as appropriate. When adding, the pinch valve 109 is closed as shown in FIG.
(3) Next, the injected chemical solution is injected into the natural mountain B from the plurality of chemical liquid injection tubes A press-fitted into the natural mountain B. When injecting, the guide tube 104 is removed as shown in FIG. 3 (a), the inlet 103 of the segment 102 is water-stopped, and the pinch valve 109 is removed from the joint 106 as shown in FIG. 3 (b). The injection pipe 107 of the chemical liquid supply apparatus C (shown in FIG. 4) is connected to the proximal end portion of the chemical liquid injection pipe A1 through the valve 110.

複数の薬液注入管Aには注入薬液が同時に圧送され、注入薬液の注入量及び注入圧は一括管理され、注入薬液の注入と同時に注入量及び注入圧力が記録されるようになっている。
(4)注入完了後は、薬液注入管Aからバルブ110及び注入ホース107を取り外し、セグメント102の導入口103からセグメント102の内側に突出する薬液注入管A1のうち該突出部分を切断し、ブラインドフランジ108で導入口103を塞ぎ、薬液注入管A及び継ぎ足し用の薬液注入管A1を埋め殺しにする。
A plurality of injection solutions A are simultaneously pumped with an injection solution, the injection amount and the injection pressure of the injection solution are collectively managed, and the injection amount and the injection pressure are recorded simultaneously with the injection of the injection solution.
(4) After the injection is completed, the valve 110 and the injection hose 107 are removed from the chemical injection pipe A, and the protruding portion of the chemical injection pipe A1 protruding from the inlet 103 of the segment 102 to the inside of the segment 102 is cut and blinded. The inlet 108 is closed by the flange 108, and the chemical solution injection tube A and the additional chemical solution injection tube A1 are filled.

次の注入区間の地山Bについても上述と同じ要領で注入作業を行う。   For the ground B in the next injection section, the injection operation is performed in the same manner as described above.

図5に示す斜線部分は、薬液注入管A一本当たりの地山Bへの注入薬液の注入浸透域を示し、図6に示す従来の薬液注入管300による注入薬液の注入浸透域に較べて浸透域を拡げることができる。   The hatched portion shown in FIG. 5 shows the injection penetration area of the injection chemical liquid into the natural ground B per one chemical injection pipe A, compared with the injection penetration area of the injection chemical liquid by the conventional chemical injection pipe 300 shown in FIG. The permeation area can be expanded.

かかる工法に用いられる薬液供給装置Cは、薬液タンクC1と、薬液タンクC1から薬液注入管Aに注入薬液を供給する注入管(薬液流路)C2と、一注入区間に設置される複数本の薬液注入管Aに注入管C2を通じて注入薬液を圧送するためのポンプC3及び記録計C4と、セグメント102への偏圧作用を防止するために最大圧力(例えば0.3MPa)を設定したリリーフバルブC5とを備えている。   The chemical solution supply device C used in such a construction method includes a chemical solution tank C1, an injection tube (chemical solution flow channel) C2 for supplying an injection chemical solution from the chemical solution tank C1 to the chemical solution injection tube A, and a plurality of injection tubes installed in one injection section. A pump C3 and a recorder C4 for pumping the injected drug solution to the drug solution injection tube A through the injection tube C2, and a relief valve C5 having a maximum pressure (for example, 0.3 MPa) set to prevent a biasing action on the segment 102 And.

薬液注入管Aに流入する注入薬液の圧力が所定圧力以下になるように制御する圧力制御手段は、薬液注入管Aに流入する注入薬液の圧力を検知する図外の圧力検知部と、前記圧力検知部の検知信号に基づいてポンプC3を制御する図外のコントローラとで構成するようにしても良く、また、前記圧力検知部と、図外の比例電磁弁と、前記圧力検知部の検知信号に基づいて前記比例電磁弁を制御する図外のコントローラとで構成するようにしても良い。   The pressure control means for controlling the pressure of the injected drug solution flowing into the drug solution injection pipe A to be equal to or lower than a predetermined pressure includes a pressure detection unit (not shown) that detects the pressure of the injected drug solution flowing into the drug solution injection pipe A, and the pressure You may make it comprise with the controller outside a figure which controls pump C3 based on the detection signal of a detection part. Moreover, the detection signal of the said pressure detection part, a proportional electromagnetic valve outside a figure, and the said pressure detection part The controller may be configured with a controller (not shown) that controls the proportional solenoid valve based on the above.

(a)は本発明の薬液注入管の実施形態を示す一部破断した正面図、(b)は(a)のX部分の拡大図、(c)は(a)のY部分の拡大図である。(A) is the partially broken front view which shows embodiment of the chemical | medical solution injection tube of this invention, (b) is the enlarged view of X part of (a), (c) is the enlarged view of Y part of (a). is there. (a)〜(c)は薬液注入工法の工程を示す断面図である。(A)-(c) is sectional drawing which shows the process of a chemical injection method. (a)〜(c)は薬液注入工法の工程を示す断面図である。(A)-(c) is sectional drawing which shows the process of a chemical injection method. 本発明の薬液注入工法に用いられる薬液供給装置を示す概略図である。It is the schematic which shows the chemical | medical solution supply apparatus used for the chemical injection method of this invention. 薬液注入管一本当たりの地山への注入薬液の注入浸透域を示す断面図である。It is sectional drawing which shows the injection | pouring penetration area | region of the injection chemical | medical solution to the natural ground per chemical | medical solution injection tube. 従来の薬液注入管一本当たりの地山への注入薬液の注入浸透域を示す断面図である。It is sectional drawing which shows the injection | pouring penetration area | region of the injection chemical | medical solution to the natural ground per conventional chemical | medical solution injection tube.

符号の説明Explanation of symbols

A 薬液注入管
1 管本体
11 周壁部
12 吐出孔
2 拡散層
3 ビット
4 拡散体
A chemical solution injection pipe 1 pipe body 11 peripheral wall 12 discharge hole 2 diffusion layer 3 bit 4 diffusion

Claims (9)

周壁部に注入薬液の吐出孔を有する管本体と、
拡散体を前記管本体の外周面に前記吐出孔を覆うように固定して形成された、前記注入薬液を拡散させる拡散層と、を備え、
前記管本体内に圧送された前記注入薬液を前記吐出孔から前記拡散層を介して地山に浸透させ
前記拡散体は、通液性を有する基板上に芝材が植設された人工芝であることを特徴とする薬液注入管。
A tube main body having a discharge hole for the injected medicinal solution on the peripheral wall,
A diffusion layer formed by fixing a diffuser to the outer peripheral surface of the tube main body so as to cover the discharge hole, and diffusing the infusate solution,
Infiltrate the injecting chemical solution pumped into the tube body from the discharge hole into the natural ground through the diffusion layer ,
The chemical diffusion tube , wherein the diffuser is an artificial turf in which a turf material is planted on a liquid-permeable substrate .
前記拡散層は、マット状の拡散体を前記管本体の外周面に巻設することにより形成されたことを特徴とする請求項1に記載の薬液注入管。 2. The drug solution injection tube according to claim 1, wherein the diffusion layer is formed by winding a mat-like diffuser around an outer peripheral surface of the tube body. 前記拡散層を含む前記管本体部分の外径寸法よりも大きな外径寸法を有するビットを、前記管本体の先端に設けたことを特徴とする請求項1又は2に記載の薬液注入管。 The drug solution injection tube according to claim 1 or 2 , wherein a bit having an outer diameter larger than an outer diameter of the tube main body portion including the diffusion layer is provided at a distal end of the tube main body. シールド機により掘削した地山の覆工壁としてセグメントを組立設置し、薬液注入管を前記セグメントから前記地山中に圧入し、前記薬液注入管から前記地山に注入薬液を注入する薬液注入工法において、
請求項1からのいずれかに記載の薬液注入管を用い、
前記覆工壁の周方向に適宜間隔を設けて複数の前記薬液注入管を配設し、複数の前記薬液注入管を前記セグメントから前記地山中に圧入し、薬液供給装置を用いて複数の前記薬液注入管の吐出孔から前記拡散層を介して前記地山に注入薬液を注入し、前記薬液注入管を埋め殺しにすることを特徴とする薬液注入工法。
In the chemical injection method of assembling and installing a segment as a lining wall of a natural ground excavated by a shield machine, press-fitting a chemical injection pipe from the segment into the natural ground, and injecting an injection chemical into the natural ground from the chemical injection pipe ,
Using the chemical injection tube according to any one of claims 1 to 3 ,
A plurality of the chemical injection pipes are arranged at appropriate intervals in the circumferential direction of the lining wall, a plurality of the chemical injection pipes are press-fitted into the ground from the segment, and a plurality of the chemical injection pipes are used by using a chemical supply apparatus. A chemical injection method characterized by injecting an injection chemical into the natural ground from the discharge hole of the chemical injection pipe through the diffusion layer and filling the chemical injection pipe.
前記薬液供給装置は、薬液タンクと、前記薬液タンクから前記薬液注入管に前記注入薬液を供給する薬液流路と、前記薬液流路を通じて前記薬液注入管に前記注入薬液を圧送するポンプと、前記薬液注入管に流入する注入薬液の圧力が所定圧力以下になるように制御する圧力制御手段と、備えたことを特徴とする請求項記載の薬液注入工法。 The chemical liquid supply device includes a chemical liquid tank, a chemical liquid flow path for supplying the injected chemical liquid from the chemical liquid tank to the chemical liquid injection pipe, a pump for pumping the injected chemical liquid to the chemical liquid injection pipe through the chemical liquid flow path, 5. The chemical solution injection method according to claim 4 , further comprising pressure control means for controlling the pressure of the injected chemical solution flowing into the chemical solution injection pipe to be equal to or lower than a predetermined pressure. 前記圧力制御手段は、前記薬液注入管に流入する前記注入薬液の圧力を検知する圧力検知部と、前記圧力検知部の検知信号に基づいて前記ポンプを制御するコントローラと、を備えたことを特徴とする請求項に記載の薬液注入工法。 The pressure control means includes a pressure detection unit that detects the pressure of the injected drug solution flowing into the drug solution injection tube, and a controller that controls the pump based on a detection signal of the pressure detection unit. The chemical injection method according to claim 5 . 前記圧力制御手段は、前記薬液注入管に流入する前記注入薬液の圧力を検知する圧力検知部と、比例電磁弁と、前記圧力検知部の検知信号に基づいて前記比例電磁弁を制御するコントローラと、を備えたことを特徴とする請求項に記載の薬液注入工法。 The pressure control means includes: a pressure detection unit that detects the pressure of the injected drug solution flowing into the drug solution injection pipe; a proportional solenoid valve; and a controller that controls the proportional solenoid valve based on a detection signal of the pressure detection unit; The chemical solution injection method according to claim 5 , comprising: 複数の前記薬液注入管の吐出孔から前記地山に注入薬液を同時に注入することを特徴とする請求項から7のいずれかに記載の薬液注入工法。 The chemical injection method according to any one of claims 4 to 7, wherein injection chemicals are simultaneously injected into the ground from discharge holes of a plurality of chemical injection pipes. 複数の前記薬液注入管による薬液の注入量及び注入圧を一括管理することを特徴とする請求項から8のいずれかに記載の薬液注入工法。 The chemical solution injection method according to any one of claims 4 to 8 , wherein the chemical solution injection amount and the injection pressure by the plurality of chemical solution injection tubes are collectively managed.
JP2005201249A 2005-07-11 2005-07-11 Chemical injection pipe and chemical injection method Expired - Fee Related JP4583263B2 (en)

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