JP3406567B2 - Ground injection method - Google Patents
Ground injection methodInfo
- Publication number
- JP3406567B2 JP3406567B2 JP2000140049A JP2000140049A JP3406567B2 JP 3406567 B2 JP3406567 B2 JP 3406567B2 JP 2000140049 A JP2000140049 A JP 2000140049A JP 2000140049 A JP2000140049 A JP 2000140049A JP 3406567 B2 JP3406567 B2 JP 3406567B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- injection
- pipe
- discharge port
- injected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は全部または一部が生
物分解性プラスチックスで形成された地盤注入用注入管
装置を用いた地盤注入工法に係り、特に、注入の後、注
入管装置を地盤中に取り残し、埋め殺しにしても、地中
の微生物によって分解されて水、炭酸ガス等の無害な物
質となり、シールド工法のように地盤を掘削する際にも
作業性を低下させたり、または地下水にその成分が溶出
したり等の心配のない地盤注入工法に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection pipe for ground injection, which is wholly or partially formed of biodegradable plastics.
Regarding the ground injection method using the device , especially after injection, even if the injection pipe device is left in the ground and buried, it is decomposed by microorganisms in the ground to become harmless substances such as water and carbon dioxide, The present invention relates to a ground injection method in which workability is not deteriorated even when excavating the ground like the shield method, or the components thereof are eluted into groundwater .
【０００２】[0002]
【従来の技術】地盤中に注入材を注入して該地盤を強化
するに際して、従来、ストレーナー注入管装置、二重管
ダブルパッカ注入管装置、複数の注入用細管を結束した
注入管装置等を使用することが一般に知られている。2. Description of the Related Art Strainer injection pipe device, double pipe double packer injection pipe device, injection pipe device in which a plurality of injection thin tubes are bundled, etc. are conventionally used for injecting an injection material into the soil to strengthen the soil. It is generally known to do.
【０００３】これら公知の注入管は塩化ビニル、ポリエ
チレン、ポリプロピレン等、引張強度が大きく、かつ生
物によって分解されない材料により構成されていた。特
に、これら材料の中で、焼却の際にダイオキシン等の有
害物質を発生する塩化ビニルの使用が大半を占めてい
た。These known injection pipes are made of materials such as vinyl chloride, polyethylene, polypropylene, etc., which have high tensile strength and are not decomposed by living organisms. In particular, of these materials, vinyl chloride, which produces harmful substances such as dioxins when incinerated, accounted for the majority.
【０００４】[0004]
【発明が解決すべき課題】一般に、地盤に注入材を注入
して該地盤を固結、強化するに際し、使用される注入管
がプラスチックス製の場合にはこれを地盤中に取り残す
ことが多く行われている。この場合、シールド工法のよ
うに地盤を掘削する際に邪魔になって作業性が低下した
り、あるいはプラスチックスからその成分が溶出して地
下水を汚染する等の弊害が生じる。Generally, when an injection material is injected into the ground to consolidate and strengthen the ground, when the injection pipe used is made of plastics, it is often left in the ground. Has been done. In this case, as in the shield construction method, there is an adverse effect such that it becomes an obstacle when excavating the ground and the workability is deteriorated, or the component is eluted from the plastics to contaminate groundwater.
【０００５】そこで、本発明の目的は注入管装置の全部
または一部を生物分解性プラスチックスで形成し、地盤
中に注入材を注入の後、注入管装置を地盤中に取り残
し、埋め殺しにしても、地中の微生物によって分解され
て水、炭酸ガス等の無害な物質に変化し、これにより、
シールド工法のように地盤を掘削する際にも邪魔になっ
て、作業性を低下させたり、または地下水にその成分が
溶出したり等の弊害を起こさず、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, an object of the present invention is to form all or a part of the injection pipe device with biodegradable plastics, and after injecting the injection material into the ground, leave the injection pipe device in the ground and bury it. However, it is decomposed by microorganisms in the ground and converted into harmless substances such as water and carbon dioxide, which
It is an obstacle when excavating the ground like the shield method, does not cause work such as reducing workability or elution of its components into groundwater, and has improved the above-mentioned drawbacks in the known art. It is to provide the ground injection method .
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
め、本発明によれば、全部または一部が生物分解性プラ
スチックスで形成された注入管装置を注入すべき地盤中
に埋設し、該注入管装置の吐出口を通じて地盤中に地盤
注入材を注入の後、生物分解性プラスチックスで形成さ
れた該地盤注入管装置を埋め殺しにして地盤中の微生物
で分解するようにし、地盤を掘削する際に邪魔になって
作業性を低下させたり、または地下水にその成分が溶出
したりの弊害を防止することを特徴とする。To achieve the above object , according to the present invention , a wholly or partly biodegradable plastic is used.
In the ground to be injected with injection pipe device formed of sticks
Embedded in the ground, and through the discharge port of the injection pipe device into the ground
Made of biodegradable plastics after injection of injection material
Microorganisms in the ground by burying the ground injection pipe device
So that it will be an obstacle when excavating the ground
Reduces workability or elutes its components in groundwater
It is characterized by preventing the harmful effects of doing.
【０００７】さらに、上述の目的を達成するため、本発
明によれば、軸方向に複数の外管吐出口を有し、生物分
解性プラスチックスで形成された外管を注入すべき地盤
に埋設し、先端部に内管吐出口を有し、かつ、この内管
吐出口の上下位置に間隔をあけて一対のパッカを保持し
た内管を前記外管管路内に挿入するとともに前記一対の
パッカを外管内壁面に摺動させながら外管吐出口が一対
のパッカ間に位置するように上下に移動し、この状態で
地盤注入材を内管管路、内管吐出口および外管吐出口を
通して地盤に注入の後、外管を地盤中に埋め殺しにし、
さらには、先端に吐出口をそれぞれ有する複数本の独立
した細管を各吐出口が軸方向に間隔をおいて位置するよ
うに結束してなる、生物分解性プラスチックスで形成さ
れた結束注入管を注入すべき地盤に埋設し、該結束注入
管の細管吐出口を通じて地盤中に地盤注入材を注入の
後、該結束注入管を地盤中に埋め殺しにして地盤中の微
生物で分解するようにし、地盤を掘削する際に邪魔にな
って作業性を低下させたり、または地下水にその成分が
溶出したりの弊害を防止することを特徴とする。 Further, in order to achieve the above-mentioned object, according to the present invention , a plurality of outer tube discharge ports are provided in the axial direction,
Ground to which an outer pipe made of degradable plastics should be injected
Is embedded in the inner pipe, has an inner pipe discharge port at the tip, and
Hold a pair of packers at intervals above and below the discharge port.
The inner pipe into the outer pipe line, and
While sliding the packer on the inner wall surface of the outer tube,
Move it up and down so that it is located between the packers of
Use the ground injection material for the inner pipe line, the inner pipe discharge port, and the outer pipe discharge port.
After injecting into the ground through, the outer pipe is buried in the ground,
Furthermore, multiple independent outlets, each with a discharge port at the tip
Make sure that each discharge port is positioned with a gap in the axial direction.
Made of biodegradable plastics
Bundling injection tube is buried in the ground to be injected,
Injecting the ground injection material into the ground through the thin pipe outlet of the pipe
After that, the binding injection pipe is buried in the ground to remove fine particles in the ground.
Make sure that it is biodegradable and will not interfere with the excavation of the ground.
Reduce the workability, or the component in the groundwater
It is characterized by preventing adverse effects such as elution.
【０００８】[0008]
【発明の実施の態様】以下、本発明を添付図面を用いて
具体的に詳述する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings.
【０００９】図１は本発明にかかる注入管装置を用いて
地盤注入を行った具体例であり、図２〜図５はいずれも
本発明にかかる注入管装置の具体例を表した断面図であ
る。FIG. 1 is a specific example of performing ground injection using the injection pipe device according to the present invention, and FIGS. 2 to 5 are sectional views showing specific examples of the injection pipe device according to the present invention. is there.
【００１０】図１は注入すべき地盤８中に注入管装置
Ａ、Ａ・・Ａを複数本並列して埋設し、これら注入管装
置Ａ、Ａ・・Ａの吐出口３、３・・３を通じて地盤８中
に地盤注入材を注入する例であって、注入後、掘削予定
のトンネル17を包含する注入ゾーン16を固化する。これ
ら注入管装置Ａ、Ａ・・Ａは全て生物分解性プラスチッ
クスで形成され、注入の後、地盤８中に埋め殺しにさ
れ、やがて、地盤８中で微生物分解される。In FIG. 1, a plurality of injection pipe devices A, A ... A are embedded in parallel in the ground 8 to be injected, and the discharge ports 3, 3 ... 3 of these injection pipe devices A, A. This is an example of injecting the ground injection material into the ground 8 through the above. After the injection, the injection zone 16 including the tunnel 17 to be excavated is solidified. These injection pipe devices A, A, ... A are all formed of biodegradable plastics, and after injection, they are buried in the ground 8 and, eventually, are microbially decomposed in the ground 8.
【００１１】図２の注入管装置Ａは二重管ダブルパッカ
注入管装置の基本例であって、軸方向に複数の外管吐出
口３、３・・・３を有する外管１と、この外管１の管路
１ａ内に挿入され、先端部に内管吐出口５を有し、か
つ、この内管吐出口５の上下位置に間隔をあけて一対の
パッカ６、６を保持した内管２とを備えて構成される。
内管２は一対のパッカ６、６が外管１の内壁面７を摺動
しながら上下に移動自在である。この注入管装置Ａは外
管１のみが生物分解性プラスチックスで形成される。The injection pipe apparatus A of FIG. 2 is a basic example of a double pipe double packer injection pipe apparatus, and includes an outer pipe 1 having a plurality of outer pipe discharge ports 3, 3, ... An inner pipe that is inserted into the pipe passage 1a of the pipe 1, has an inner pipe discharge port 5 at its tip, and holds a pair of packers 6, 6 at the upper and lower positions of the inner pipe discharge port 5 at intervals. And 2.
The inner pipe 2 is vertically movable while a pair of packers 6, 6 slide on the inner wall surface 7 of the outer pipe 1. In this injection tube device A, only the outer tube 1 is made of biodegradable plastics.
【００１２】図２の注入管装置Ａを用いて地盤８中に地
盤注入材を注入するに当たり、まず、軸方向に複数の外
管吐出口３、３・・・３を有し、生物分解性プラスチッ
クスで形成された外管１を注入すべき地盤８の削孔11に
挿入する。In injecting the ground injection material into the ground 8 by using the injection pipe apparatus A of FIG. 2, first, a plurality of outer pipe discharge ports 3, 3, ... The outer pipe 1 made of plastics is inserted into the drilled hole 11 in the ground 8 to be injected.
【００１３】次いで、外管１と孔壁11ａの間の削孔11中
にスリーブグラウト10（シール材）を充填して外管１を
削孔11中に固定する。このスリーブグラウト10（シール
材）としては、一軸圧縮強度で０.1〜２.0ＭＮ／ｍ2 程
度のものが好ましく、特に２〜３日経過しても強度があ
まり増加しないようなものが好ましい。Then, a sleeve grout 10 (sealing material) is filled in the drilled hole 11 between the outer tube 1 and the hole wall 11a to fix the outer tube 1 in the drilled hole 11. As the sleeve grout 10 (sealing material), one having a uniaxial compressive strength of about 0.1 to 2.0 MN / m 2 is preferable, and one having a strength that does not increase so much even after 2 to 3 days is preferable. .
【００１４】さらに、先端部に内管吐出口５を有し、か
つ、この内管吐出口５の上下位置に間隔をあけて一対の
パッカ６、６を保持した内管２を外管管路１ａ内に挿入
するとともに、一対のパッカ６、６を外管１の内壁面７
に摺動させながら、外管吐出口３が一対のパッカ６、６
間に位置するように上下に移動し、この状態で地盤注入
材を内管管路２ａ、内管吐出口５および外管吐出口３を
通じ、スリーグラウト10を破って地盤８中に注入する。
外管１は地盤８中に埋め殺しにする。Further, the inner pipe 2 having an inner pipe discharge port 5 at its tip and holding a pair of packers 6, 6 at upper and lower positions of the inner pipe discharge port 5 is connected to the outer pipe line. 1a and inserts a pair of packers 6, 6 into the inner wall surface 7 of the outer tube 1.
While the outer pipe discharge port 3 slides on the
It moves up and down so as to be located between them, and in this state, the ground injection material is injected into the ground 8 through the inner pipe line 2a, the inner pipe discharge port 5 and the outer pipe discharge port 3 while breaking the sleigh grout 10.
The outer pipe 1 is buried in the ground 8.
【００１５】図３の注入管装置Ａは多点注入管装置の基
本例であって、先端に吐出口12をそれぞれ有する複数本
の独立した細管13、13・・・13を各吐出口12、12・・・
12が軸方向に間隔をおいて位置するように結束板14で結
束した結束注入管15から構成される。この結束注入管15
は生物分解性プラスチックスで形成される。The injection tube apparatus A of FIG. 3 is a basic example of a multi-point injection tube apparatus, in which a plurality of independent thin tubes 13, 13, ... 12 ...
It is composed of a binding injection pipe 15 bound by a binding plate 14 so that 12 are positioned at intervals in the axial direction. This united injection tube 15
Is formed of biodegradable plastics.
【００１６】図３の注入管装置Ａを用いて地盤８中に地
盤注入材を注入するに当たり、まず、先端に吐出口12を
有する複数本の独立した細管13、13・・・13を各吐出口
12、12・・・12が軸方向に間隔をあけて位置するように
結束した生物分解性プラスチックスで形成された結束注
入管15を注入すべき地盤８の削孔11に挿入する。In injecting the ground injection material into the ground 8 using the injection pipe apparatus A of FIG. 3, first, a plurality of independent thin tubes 13, 13 ... 13 having a discharge port 12 at the tip are discharged. exit
A binding injection pipe 15 made of biodegradable plastics, which is bound so that 12, 12, ... 12 are spaced apart in the axial direction, is inserted into the drilled hole 11 of the ground 8 to be injected.
【００１７】次いで、図２と同様、結束注入管15と孔壁
11ａの間の削孔11中にスリーブグラウト10（シール材）
を充填して結束注入管15を削孔11中に固定する。このス
リーブグラウト10（シール材）としては、一軸圧縮強度
で０.1〜２.0ＭＮ／ｍ2 程度のものが好ましく、特に２
〜３日経過しても強度があまり増加しないものが好まし
い。Next, as in FIG. 2, the binding injection pipe 15 and the hole wall
Sleeve grout 10 (sealing material) in the hole 11 between 11a
And the binding injection pipe 15 is fixed in the drilled hole 11. The sleeve grout 10 (sealing material) preferably has a uniaxial compressive strength of about 0.1 to 2.0 MN / m 2 , and particularly 2
It is preferable that the strength does not increase so much even after 3 days.
【００１８】この状態で吐出口12から細管13を通して地
盤注入材を導入し、スリーブグラウト10を破って地盤８
中注入する。結束注入管15は地盤８中に置き放しとし、
埋め殺しにする。なお、結束注入管15の代わりに後述の
図５と同様に複数の内管２、２・・・２が穿孔された注
入管を用いることもできる。In this state, the ground injection material is introduced from the discharge port 12 through the thin tube 13, and the sleeve grout 10 is broken to break the ground 8.
Inject inside. The binding injection pipe 15 is left in the ground 8,
I will make it to the buried state. Note that instead of the bundling injection tube 15, an injection tube in which a plurality of inner tubes 2, 2, ...
【００１９】図３における細管13は好ましくは内径２〜
１０mm、肉圧0.７〜2.０mmである。また、耐圧力は管内
圧として1.０ＭＮ／ｍ2 以上、好ましくは5.０ＭＮ／ｍ
2 程度である。細管13の先端は通常、栓またはスリーブ
によって閉塞され、注入時に注入圧により開口するよう
になっており、さらに、注入材が逆流しないように構成
されている。The thin tube 13 in FIG. 3 preferably has an inner diameter of 2 to
The thickness is 10 mm and the meat pressure is 0.7 to 2.0 mm. The withstand pressure is 1.0 MN / m 2 or more, preferably 5.0 MN / m 2 as the pipe internal pressure.
It is about 2 . The tip of the thin tube 13 is normally closed by a stopper or a sleeve, opened at the time of injection by injection pressure, and further, the injection material does not flow backward.
【００２０】細管13の数は注入ステージ数により適宜選
択することができ、好ましくは２〜10本である。また、
細管13の吐出口12間の間隔は３０〜１００cmが好まし
い。The number of the thin tubes 13 can be appropriately selected depending on the number of injection stages, and is preferably 2 to 10. Also,
The distance between the discharge ports 12 of the thin tube 13 is preferably 30 to 100 cm.
【００２１】細管13を結束するときには、図示しない
が、支持棒や、口径３０〜６０mmの注入管を補助材とし
て結束板により結束する。これら補助材は生物分解性プ
ラスチックスで製造してもよいが、注入後に撤去するこ
ともできる。また、結束板は厚さ５〜１５mm程度の板状
体で、好ましくは円盤状をなし、細管13を通す孔、ある
いは細管13を嵌め込む凹部を有するものである。When binding the thin tubes 13, although not shown, a supporting rod or an injection tube having a diameter of 30 to 60 mm is used as an auxiliary material to bind the thin tubes 13. These auxiliaries may be made of biodegradable plastics but can also be removed after injection. The bundling plate is a plate-shaped body having a thickness of about 5 to 15 mm, and preferably has a disk shape and has a hole through which the thin tube 13 is inserted or a recess into which the thin tube 13 is fitted.
【００２２】地盤注入材としては強酸性のものから強ア
ルカリ性のものまで使用される。このため、注入管の材
質を選択使用する必要も生じる。しかし、注入時間が短
いため、この必要はほとんどない。As the ground injection material, strongly acidic ones and strongly alkaline ones are used. Therefore, it is necessary to select and use the material of the injection pipe. However, due to the short injection time, this need is rare.
【００２３】図４の注入管装置Ａは多点注入管装置の他
の具体例であって、外管１と、この中に設置された複数
本の内管２、２・・・２とから構成される。これら各内
管２、２・・・２の先端はそれぞれ、外管１の側壁９に
穿設された開口に嵌め込まれ、外管１の吐出口３、３・
・・３を形成し、ゴムスリーブ４、４・・・４で覆われ
ている。この注入管装置Ａは全部が生物分解性プラスチ
ックスで形成される。The injection pipe device A of FIG. 4 is another specific example of the multi-point injection pipe device, and is composed of an outer pipe 1 and a plurality of inner pipes 2, 2, ... 2 installed therein. Composed. The tips of the inner pipes 2, 2, ... 2 are fitted into the openings formed in the side wall 9 of the outer pipe 1, and the discharge ports 3, 3 ,.
..3 is formed and is covered with the rubber sleeves 4, 4, ... The injection tube device A is entirely made of biodegradable plastics.
【００２４】図５の注入管装置Ａは多点注入管装置のさ
らに他の具体例であって、中実な円筒形の内部を軸方向
に沿って複数本穿設して内管２、２・・・２を形成し、
かつ、先端をそれぞれ側壁９に貫通して吐出口３、３・
・・３を形成して構成される。この吐出口３、３・・・
３は図２と同様、ゴムスリーブ４、４・・・４で覆われ
る。この注入管装置Ａは全部が生物分解性プラスチック
スにより金型で一体成型し、あるいは内管２、２・・・
２を穿孔することにより形成される。The injection pipe apparatus A of FIG. 5 is still another specific example of the multi-point injection pipe apparatus, in which a plurality of inner tubes 2, 2 are formed by forming a plurality of solid cylindrical insides along the axial direction. ... forms 2,
In addition, the tip ends are penetrated through the side wall 9, respectively, and the discharge ports 3, 3 ,.
..3 are formed. These discharge ports 3, 3, ...
Similar to FIG. 2, 3 is covered with rubber sleeves 4, 4, ... The injection pipe apparatus A is integrally formed of a biodegradable plastic with a mold, or the inner pipes 2, 2, ...
It is formed by punching 2.
【００２５】図４、図５の注入管装置Ａはいずれも、注
入すべき地盤中に埋設され、内管２から吐出口３、３・
・・３を通じて地盤中に地盤注入材を注入し、注入後は
地盤中に置いたままにして埋め殺しにする。The injection pipe apparatus A shown in FIGS. 4 and 5 is embedded in the ground to be injected, and the inner pipe 2 to the discharge ports 3, 3 ,.
･ ･ ･ Inject the ground injection material into the ground through 3 and leave it in the ground to fill the ground.
【００２６】本発明に用いられる生物分解性プラスチッ
クスは微生物により分解される高分子化合物であって、
好ましくは熱可塑性であり、従来公知の押出成形により
加工でき、注入管としての機械的強度を有するものをい
う。なお、水溶性プラスチックス、特にアルカリ性の条
件下で溶解するプラスチックスは、生物によっても分解
され易く、本発明において好ましいものである。The biodegradable plastics used in the present invention are polymer compounds that are decomposed by microorganisms,
It is preferably thermoplastic, and can be processed by a conventionally known extrusion molding and has mechanical strength as an injection pipe. Water-soluble plastics, especially plastics that dissolve under alkaline conditions, are easily decomposed by organisms and are preferred in the present invention.
【００２７】その化学構造は（１）主鎖が脂肪族で、こ
れにエーテル結合またはエステル結合を有するもの、
（２）主鎖（または側鎖）に水酸基、カルボキシル基を
有するもの、あるいは、（３）プラスチックスの光分解
および微生物分解を誘因、促進する添加剤を含有するこ
とにより生物分解性が良好なプラスチックスであり、具
体的には澱粉系、酢酸セルロース系、ポリ乳酸系、脂肪
族ポリエステル系、ポリビニルアルコール系等の生物分
解性プラスチックスが挙げられる。これらの主原料に
は、性能の向上あるいは可撓性の付与等の目的で他の高
分子化合物、例えばポリエチレン、ポリプロピレン等の
プラスチックス、可塑剤、安定剤、着色剤等を必要に応
じて添加することもできる。Its chemical structure is (1) one whose main chain has an aliphatic structure and which has an ether bond or an ester bond,
(2) Having a hydroxyl group or carboxyl group in the main chain (or side chain), or (3) containing an additive that induces and promotes photodegradation and microbial degradation of plastics, resulting in good biodegradability. Examples of plastics include starch-based, cellulose acetate-based, polylactic acid-based, aliphatic polyester-based, and polyvinyl alcohol-based biodegradable plastics. To these main raw materials, other polymer compounds such as plastics such as polyethylene and polypropylene, plasticizers, stabilizers, colorants, etc. are added as necessary for the purpose of improving performance or imparting flexibility. You can also do it.
【００２８】上記（２）の水酸基あるいはカルボキシル
基を有する化合物としては、脂肪族化合物が好ましい。
これらの生物分解性プラスチックスとしては具体的に
は、上記（１）の例として、「ビオノーレ」（ポリオー
ルとジカルボン酸の脂肪族ポリエステル）（昭和高分子
株式会社と昭和電工株式会社）、「セルグリーン」（酢
酸セルロース系、ポリカプロラクトン系）（ダイセル化
学工業株式会社）、「ラクティ（乳酸系）」（株式会社
島津製作所）、（２）の例として、「ポバール」（ポリ
ビニルアルコール）（株式会社クラレ）、（３）の例と
して、「ワンダースターケン」（トウモロコシ澱粉とポ
リエチレン）（ワンダー株式会社）等々が挙げられる。As the compound (2) having a hydroxyl group or a carboxyl group, an aliphatic compound is preferable.
Specific examples of these biodegradable plastics include "Bionore" (aliphatic polyester of polyol and dicarboxylic acid) (Showa Polymer Co., Ltd. and Showa Denko KK), "Cell" as an example of the above (1). As an example of "Green" (cellulose acetate type, polycaprolactone type) (Daicel Chemical Industry Co., Ltd.), "Lacty (lactic acid type)" (Shimadzu Corporation), (2), "Poval" (polyvinyl alcohol) (Co., Ltd.) Examples of (Kuraray) and (3) include "Wonder Starken" (corn starch and polyethylene) (Wonder Co., Ltd.) and the like.
【００２９】上記生物分解性プラスチックスには、ポリ
ヒドロキシブチレート、ポリ乳酸、ポリグリコシド等の
高融点生物分解性プラスチックスをブレンドすることに
より、加工性を向上させ、織物、不織布とすることによ
り袋体としても使用できる。これらの主原料は、土中で
はバクテリアにより、例えば９０〜３００日程度の日数
で分解される。By blending the above-mentioned biodegradable plastics with high melting point biodegradable plastics such as polyhydroxybutyrate, polylactic acid, polyglycoside and the like, the processability is improved to obtain a woven fabric or a non-woven fabric. It can also be used as a bag. In the soil, these main raw materials are decomposed by bacteria in, for example, about 90 to 300 days.
【００３０】なお、生物分解性プラスチックスは、その
成形品と微生物の体内より代謝される酵素の表面反応で
あるため、成形品の厚みが厚いほど分解時間は長くな
る。他方、注入材がアルカリ性の場合には、エステル結
合を有する生物分解性プラスチックスが加水分解を受け
やすい。また、注入地盤は、酸性からアルカリ性まで、
あるいは海水浸透等種々の異なる条件下にあり、さら
に、注入材の注入によっても大きく変わってくる。した
がって、注入管の分解速度は一概にはいえないが、掘削
しない場合についてみると、１年といえども十分短期間
といえる。また、注入後掘削する場合には、脆性のより
大きな生物分解性プラスチックスを使用するのが好まし
い。Since the biodegradable plastic is a surface reaction of the molded product and an enzyme metabolized from the body of the microorganism, the thicker the molded product, the longer the decomposition time. On the other hand, when the injection material is alkaline, biodegradable plastics having an ester bond are susceptible to hydrolysis. In addition, the injection ground, from acidic to alkaline,
Alternatively, it is under various different conditions such as seawater infiltration, and further changes greatly depending on the injection of the injection material. Therefore, although the decomposition rate of the injection pipe cannot be generally stated, it can be said that even if it is one year, it is a sufficiently short period in the case of not excavating. Also, when drilling after injection, it is preferable to use biodegradable plastics, which are more brittle.
【００３１】本発明にかかる生物分解性プラスチックス
は必要に応じて耐候性を落とすことによって分解、ある
いは強度の低下を促進させることもでき、そのような注
入管装置を使用する場合には、特に、注入操作前の管理
に配慮し、例えば直射日光に長期間曝すとか、雨中に放
置することはできるだけ避けるのが好ましい。The biodegradable plastics according to the present invention can also be decomposed or deteriorated in strength by lowering the weather resistance, if necessary, and particularly when such an injection tube device is used. In consideration of management before the injection operation, it is preferable to avoid exposing to direct sunlight for a long period of time or leaving it in the rain as much as possible.
【００３２】生物分解性プラスチックスとして酢酸セル
ロース系およびポリエステル系について引張破断強度、
引張破断伸度、および分解評価を測定し、結果を表１に
示した。Tensile breaking strength of cellulose acetate type and polyester type as biodegradable plastics,
The tensile elongation at break and the evaluation of decomposition were measured, and the results are shown in Table 1.
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【発明の効果】本発明にかかる地盤注入工法は次の効果
を奏し得る。The ground pouring method according to the present invention has the following effects.
【００３５】１．複雑な地層の地盤を効率よく改良する
ことができる。1. It is possible to efficiently improve the ground of a complicated formation.
【００３６】２．改良した地盤をシールドマシンにより
掘削する場合にも、注入細管に起因するトラブルの発生
がない。2. Even when the improved ground is excavated by a shield machine, there is no trouble caused by the injection pipe.
【００３７】３．注入管が土中で分解されるために、環
境への影響が少ない。3. Since the injection pipe is decomposed in the soil, it has little impact on the environment.
【図１】本発明にかかる注入管装置を用いて地盤注入を
行った具体例である。FIG. 1 is a specific example in which ground injection is performed using an injection pipe device according to the present invention.
【図２】二重管ダブルパッカ注入管装置の基本例の断面
図およびこれを用いた注入工法の説明図である。FIG. 2 is a cross-sectional view of a basic example of a double pipe double packer injection pipe device and an explanatory diagram of an injection method using the same.
【図３】多点注入管装置の基本例の断面図およびこれを
用いた注入工法の説明図である。FIG. 3 is a cross-sectional view of a basic example of a multipoint injection tube device and an explanatory view of an injection method using the same.
【図４】多点注入管装置の他の一具体例の断面図であ
る。FIG. 4 is a cross-sectional view of another specific example of the multi-point injection tube device.
【図５】多点注入管装置のさらに他の具体例の断面図で
ある。FIG. 5 is a cross-sectional view of still another specific example of the multipoint injection tube device.
Ａ 注入管装置 １ 外管 1a 外管管路 ２ 内管 2a 内管管路 ３ 外管吐出口 ４ ゴムスリーブ ５ 内管吐出口 ６ パッカ ７ 内壁面 ８ 地盤 ９ 側壁 10 スリーブグラウト 11 削孔 11a 孔壁 12 吐出口 13 細管 14 結束板 15 結束注入管 16 注入ゾーン 17 注入後掘削予定のトンネル A injection tube device 1 outer tube 1a Outer pipe line 2 inner tube 2a Inner pipeline 3 Outer pipe outlet 4 rubber sleeves 5 Inner pipe outlet 6 packers 7 inner wall surface 8 ground 9 Side wall 10 sleeve grout 11 Drilling 11a hole wall 12 outlet 13 thin tube 14 tie plate 15 union injection tube 16 injection zones 17 Tunnel to be excavated after injection
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 3/12 101 E21D 9/06 301 Front page continuation (58) Fields surveyed (Int.Cl. 7 , DB name) E02D 3/12 101 E21D 9/06 301
Claims (3)
クスで形成された注入管装置を注入すべき地盤中に埋設
し、該注入管装置の吐出口を通じて地盤中に地盤注入材
を注入の後、生物分解性プラスチックスで形成された該
地盤注入管装置を埋め殺しにして地盤中の微生物で分解
するようにし、地盤を掘削する際に邪魔になって作業性
を低下させたり、または地下水にその成分が溶出したり
の弊害を防止することを特徴とする地盤注入工法。1. A wholly or partly biodegradable plastic
The injection pipe device formed by a box is buried in the ground to be injected.
Then, the ground injection material is injected into the ground through the discharge port of the injection pipe device.
After injection, the biodegradable plastics formed
Ground injection pipe device is buried and decomposed by microorganisms in the ground
Workability that is an obstacle when excavating the ground
Decrease, or the component elutes in groundwater
Ground injection method characterized by preventing the adverse effects of
分解性プラスチックスで形成された外管を注入すべき地
盤に埋設し、先端部に内管吐出口を有し、かつ、この内
管吐出口の上下位置に間隔をあけて一対のパッカを保持
した内管を前記外管管路内に挿入するとともに前記一対
のパッカを外管内壁面に摺動させながら外管吐出口が一
対のパッカ間に位置するように上下に移動し、この状態
で地盤注入材を内管管路、内管吐出口および外管吐出口
を通して地盤に注入の後、外管を地盤中に埋め殺しにし
て地盤中の微生物で分解するようにし、地盤の掘削する
際に邪魔になって作業性を低下させたり、または地下水
にその成分が溶出したりの弊害を防止することを特徴と
する地盤注入工法。2. An organism having a plurality of outer pipe discharge ports in the axial direction,
Place where the outer tube made of degradable plastics should be injected
It is embedded in a board, has an inner pipe outlet at the tip, and
Holds a pair of packers at intervals above and below the pipe outlet
The inserted inner pipe into the outer pipe line and
While sliding the packer on the inner wall surface of the outer tube,
Move up and down so that it is located between the pair of packers, and in this state
Ground injection material in inner pipe line, inner pipe discharge port and outer pipe discharge port
After injecting into the ground through
Excavate the ground so that it is decomposed by microorganisms in the ground.
May hinder workability or cause
It is characterized by preventing the harmful effects of its components being eluted
Ground injection method to be.
独立した細管を各吐出口が軸方向に間隔をおいて位置す
るように結束してなる、生物分解性プラスチックスで形
成された結束注入管を注入すべき地盤に埋設し、該結束
注入管の細管吐出口を通じて地盤中に地盤注入材を注入
の後、該結束注入管を地盤中に埋め殺しにして地盤中の
微生物で分解するようにし、地盤を掘削する際に邪魔に
なって作業性を低下させたり、または地下水にその成分
が溶出したりの弊害を防止することを特徴とする地盤注
入工法。3. A plurality of nozzles each having a discharge port at its tip.
Separate capillaries with each discharge port axially spaced
Made of biodegradable plastics
Embed the formed bundle injection pipe in the ground to be injected,
Ground injection material is injected into the ground through the narrow pipe outlet of the injection pipe.
After that, the binding injection pipe is buried in the ground and the
Prevent it from being decomposed by microorganisms, which hinders the excavation of the ground
Becomes less workable or its constituents in groundwater
A ground pouring method characterized by preventing harmful effects such as elution .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000140049A JP3406567B2 (en) | 2000-05-12 | 2000-05-12 | Ground injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000140049A JP3406567B2 (en) | 2000-05-12 | 2000-05-12 | Ground injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001323452A JP2001323452A (en) | 2001-11-22 |
| JP3406567B2 true JP3406567B2 (en) | 2003-05-12 |
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ID=18647403
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|---|---|---|---|
| JP2000140049A Expired - Fee Related JP3406567B2 (en) | 2000-05-12 | 2000-05-12 | Ground injection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007040057A (en) * | 2005-08-05 | 2007-02-15 | Mitsubishi Materials Corp | Ground excavation method |
| JP2011080224A (en) * | 2009-10-06 | 2011-04-21 | Kyokado Kk | Grouting method |
Families Citing this family (10)
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|---|---|---|---|---|
| JP2006097272A (en) * | 2004-09-28 | 2006-04-13 | Ohbayashi Corp | Method of removing redundant portion of pipe bodies in natural ground reinforcing works |
| JP2007212270A (en) * | 2006-02-09 | 2007-08-23 | Mitsubishi Plastics Ind Ltd | Seismic exploration method |
| JP4741619B2 (en) * | 2008-03-07 | 2011-08-03 | 新日本開発株式会社 | Ground excavation method |
| EP2425904A1 (en) * | 2010-09-07 | 2012-03-07 | P&J Holding B.V. | Stand pipe for environmental monitoring made of biodegradable material |
| JP5612500B2 (en) * | 2011-02-02 | 2014-10-22 | 東日本旅客鉄道株式会社 | Removal type chemical injection pipe and super multi-point simultaneous injection method |
| CN103867216A (en) * | 2014-04-08 | 2014-06-18 | 中铁二十五局集团轨道交通工程有限公司 | Soil stabilization structure and method for railway yard shield tunneling construction |
| CN106285695B (en) * | 2016-10-31 | 2018-02-27 | 海南大学 | A kind of shield tunnel termination microorganism ruggedized construction and its construction method |
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| CN111878084B (en) * | 2020-07-15 | 2022-09-13 | 中铁十八局集团有限公司 | Rapid treatment method for controlling surface subsidence by using large-diameter shield construction in case of meeting stratum funnel |
| CN113235579B (en) * | 2021-04-23 | 2022-06-17 | 海南大学 | Frozen microbial soil stirring pile |
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2000
- 2000-05-12 JP JP2000140049A patent/JP3406567B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007040057A (en) * | 2005-08-05 | 2007-02-15 | Mitsubishi Materials Corp | Ground excavation method |
| JP2011080224A (en) * | 2009-10-06 | 2011-04-21 | Kyokado Kk | Grouting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001323452A (en) | 2001-11-22 |
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