JP3470164B2 - Ground improvement method of shield machine start section - Google Patents
Ground improvement method of shield machine start sectionInfo
- Publication number
- JP3470164B2 JP3470164B2 JP28059593A JP28059593A JP3470164B2 JP 3470164 B2 JP3470164 B2 JP 3470164B2 JP 28059593 A JP28059593 A JP 28059593A JP 28059593 A JP28059593 A JP 28059593A JP 3470164 B2 JP3470164 B2 JP 3470164B2
- Authority
- JP
- Japan
- Prior art keywords
- shield machine
- ground
- excavation
- machine starting
- shaft
- 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]
【産業上の利用分野】本発明は、シールド機が掘削を開
始する地盤を改良する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the ground where a shield machine starts excavation.
【０００２】[0002]
【従来の技術】従来、掘削機の発進部の地盤の改良を行
う方法として、薬液注入方法、高圧噴射注入方法、凍結
方法などがある。2. Description of the Related Art Conventionally, as a method for improving the ground at the starting portion of an excavator, there are a chemical injection method, a high-pressure injection injection method, a freezing method and the like.
【０００３】[0003]
【発明が解決しようとする問題点】しかし、従来の方法
では、次のような問題点がある。
＜イ＞薬液注入方法の場合、改良土の強度が小さく、大
断面を長時間開放するには信頼性が低い。
＜ロ＞高圧噴射注入方法の場合、改良土の出来方が砂泥
互層部の砂と泥岩の層境で不均一になり、改良体の連続
性に問題があり、強度面、遮水性の面で信頼性が低い。
＜ハ＞凍結方法の場合、凍結による地盤膨脹により大き
な膨脹圧が発生し、連続地中壁などの既設の地中構造物
に悪影響を与える。
＜ニ＞薬液注入方法や高圧噴射注入方法では、大深度で
の地盤改良が極めて困難であった。However, the conventional method has the following problems. <A> In the case of the chemical injection method, the strength of the improved soil is low and the reliability is low for opening a large section for a long time. <B> In the case of the high-pressure jet injection method, the quality of the improved soil becomes uneven at the boundary between the sand and mudstone in the alternate layer of sand and mud, and there is a problem in the continuity of the improved body. Is unreliable. <C> In the case of the freezing method, a large expansion pressure is generated due to the ground expansion due to the freezing, which adversely affects existing underground structures such as continuous underground walls. <D> It was extremely difficult to improve the ground at a large depth by the chemical liquid injection method and the high-pressure injection injection method.
【０００４】[0004]
【本発明の目的】本発明は、シールド機の発進する地盤
を信頼性の高い改良地盤にする方法を提供することにあ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for improving the starting ground of a shield machine to a highly reliable improved ground.
【０００５】[0005]
【問題点を解決するための手段】本発明は、立坑からシ
ールド機を発進させる場合、立坑周辺のシールド機発進
部の地盤改良方法において、地表からシールド機発進部
付近の地盤まで掘削溝を形成し、該掘削溝に地盤改良層
を形成することを特徴とするシールド機発進部の地盤改
良方法、又は、地表からシールド機発進部付近の地盤ま
で掘削溝を形成し、該掘削溝に複数の種類の地盤改良層
を形成することを特徴とするシールド機発進部の地盤改
良方法、又は、地表からシールド機発進部付近の地盤ま
で掘削溝を形成し、シールド機発進部付近の該掘削溝に
高強度の地盤改良材を充填し、該掘削溝の他の部分に低
強度の地盤改良材を充填することを特徴とするシールド
機発進部の地盤改良方法、又は、 地表からシールド機
発進部付近の地盤まで掘削溝を形成すると共に掘削溝に
安定液を充填させ、シールド機発進部付近の該掘削溝の
安定液をモルタルなどで置換し、該掘削溝の安定液を固
化材で固化させることを特徴とするシールド機発進部の
地盤改良方法、又は、該シールド機発進部付近の立坑の
外壁面をカッティングし、該カッティングされた外壁面
に地盤改良層を形成することを特徴とするシールド機発
進部の地盤改良方法にある。According to the present invention, when starting a shield machine from a vertical shaft, in the ground improvement method of the shield machine starting portion around the shaft, an excavation groove is formed from the ground surface to the ground near the shield machine starting portion. However, the ground improvement method of the shield machine starting part, characterized by forming a ground improvement layer in the excavation groove, or forming an excavation groove from the ground surface to the ground near the shield machine starting part, a plurality of in the excavation groove A method for improving the ground of a shield machine starting part, which is characterized by forming a kind of ground improvement layer, or forming an excavation groove from the ground surface to the ground near the shield machine starting part, and in the excavating groove near the shield machine starting part A method for improving the ground of a shield machine starting portion, characterized by filling a high-strength ground improving material and filling the other part of the trench with a low-strength ground improving material, or from the ground surface to the vicinity of the shield machine starting portion Ground It is characterized in that the excavation groove is formed at the same time as the excavation groove is filled with the stabilizing solution, the stabilizing solution in the excavation groove near the shield machine starting portion is replaced with mortar, and the stabilizing solution in the excavation groove is solidified with a solidifying material. A method for improving the ground of the shield machine starting part, or cutting the outer wall surface of the shaft near the shield machine starting part, and forming a ground improvement layer on the cut outer wall surface. There is a ground improvement method.
【０００６】[0006]
【実施例】以下、図面を用いて本発明の実施例を説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【０００７】＜イ＞立坑
大深度の立坑１０は、例えば、地中連続壁１２で外側が
形成され、その内側に側壁１１が設けられる。深度が深
くなるに従って地盤からの圧力が増大するので、立坑１
０の下部の側壁１１は厚く形成される。立坑１０の大き
さは、例えば、直径３０ｍの円形で、深度が６０ｍを有
する。<B> Vertical shaft A large vertical shaft 10 has, for example, an underground continuous wall 12 formed on the outer side thereof, and a side wall 11 is provided on the inner side thereof. As the pressure from the ground increases as the depth increases, the vertical shaft 1
The lower side wall 11 of 0 is formed thick. The vertical shaft 10 has, for example, a circular shape with a diameter of 30 m and a depth of 60 m.
【０００８】＜ロ＞シールド機の発進
シールド機３０は、例えば、立坑１０の深度４０ｍ付近
から直径１２ｍの横坑を掘削する。その場合、地盤には
５Ｋｇ／ｃｍ2 程度の高水圧がかかっているため、シー
ルド機３０が地盤に貫入し掘削を開始するまでの間、切
羽面が安定な状態に保たれる必要があるため、シールド
機３０の発進部２５の地盤の強度を高めておく。<B> Starting of shield machine The shield machine 30 excavates a horizontal shaft having a diameter of 12 m from a depth of 40 m in the vertical shaft 10, for example. In that case, since the ground is subjected to a high water pressure of about 5 kg / cm 2, it is necessary to keep the face face stable until the shield machine 30 penetrates the ground and starts excavation. The strength of the ground of the starting portion 25 of the shield machine 30 is increased.
【０００９】＜ハ＞地盤改良層
立坑１０の外側周辺部でシールド機３０の発進部２５に
あたる地盤は、地盤の水圧等と立坑内部圧力との圧力差
に耐える強度になるように、地盤改良される必要があ
る。そのために、特に高い強度が要求される、例えば、
発進部２５にあたる地盤にはモルタル、コンクリートな
どを充填し、高強度地盤改良層を形成する。また、発進
部２５の直上の地盤の立坑外壁面をカッティングするた
めの反力をとるため一部高強度地盤改良層にする。その
他の部分についてはコスト面及び切削性面で有利にする
ために低強度地盤改良層にする。また、立坑１０の発進
部２５付近の外壁面を５０ｍｍ程度カッティングし、地
盤改良層を形成すると、止水性を向上することができ
る。<C> Ground improvement layer The ground corresponding to the starting portion 25 of the shield machine 30 at the outer peripheral portion of the vertical shaft 10 is improved to have a strength that can withstand the pressure difference between the water pressure of the ground and the internal pressure of the vertical shaft. Need to Therefore, particularly high strength is required, for example,
The ground corresponding to the starting part 25 is filled with mortar, concrete, etc. to form a high-strength ground improvement layer. Further, in order to take a reaction force for cutting the shaft outer wall surface of the ground right above the starting portion 25, a part of the high strength ground improvement layer is used. For other parts, a low-strength ground improvement layer is used in order to make it advantageous in terms of cost and machinability. Further, when the outer wall surface near the starting portion 25 of the vertical shaft 10 is cut by about 50 mm to form the ground improvement layer, the water stopping performance can be improved.
【００１０】以下に、地盤改良の方法を説明する。The ground improvement method will be described below.
【００１１】＜イ＞地盤改良用掘削溝の形成
シールド機３０が発進する立坑１０の周辺に地盤改良用
掘削溝２０を掘削し、掘削溝２０に地盤改良材を充填し
て地盤を改良する。掘削方法は、例えば、連続地中壁構
築用の掘削機４０、例えばエレクトロミルを使用し、２
〜３ｍの矩形の掘削面の掘削溝２０を立坑１０の周辺に
沿ってカッタ４１で掘削する。この掘削溝２０の掘削と
地盤改良材の充填を行い、オーバーラップ部２４を形成
しながら繰り返して、例えば、立坑１０の外側周辺でほ
ぼ同心円状にほぼ厚さ６ｍ、幅２０ｍの地盤改良層を形
成する。立坑を地中連続壁１２で形成する場合、掘削機
４０は立坑用掘削溝と地盤改良用掘削溝２０の両方に使
用することができる。<A> Formation of ground improvement excavation groove A ground improvement excavation groove 20 is excavated around the shaft 10 where the shield machine 30 starts, and the excavation groove 20 is filled with a ground improvement material to improve the ground. The excavation method uses, for example, an excavator 40 for constructing a continuous underground wall, for example, an electromill, and
The excavation groove 20 having a rectangular excavation surface of 3 m is excavated by the cutter 41 along the periphery of the vertical shaft 10. This excavation groove 20 is excavated and the ground improvement material is filled, and repeated while forming the overlap portion 24. For example, a ground improvement layer having a thickness of about 6 m and a width of 20 m is formed substantially concentrically around the outside of the shaft 10. Form. When the shaft is formed by the underground continuous wall 12, the excavator 40 can be used for both the shaft excavation groove and the ground improvement excavation groove 20.
【００１２】＜ロ＞地盤改良層の形成方法
立坑１０の外壁を地中連続壁１２で形成した後、掘削機
４０を用いて地表から立坑１０の周辺を掘削し、掘削溝
には安定液４２が充填される。シールド機３０が発進す
る地中連続壁１２の外壁面を例えば５０ｍｍ程度カッテ
ィングする。そして、掘削溝とカッティング部２３に強
度の大きいモルタル、コンクリートなどの高強度地盤改
良材を充填する。例えば、トレミー管４３を掘削溝の下
方に配置し、トレミー管４３を介してモルタル４４を掘
削溝２０に注入し、安定液４２と置換する。掘削溝２０
全体を高強度地盤改良材で充填しても良く、又はシール
ド機発進部２５付近の高強度地盤改良層２１の上方の安
定液４２を固化材で固化し、低強度地盤改良層２２を形
成してもよい。このように掘削溝２０の形成と地盤改良
材の充填をオーバーラップしながら繰り返し、シールド
機３０が発進する立坑の地中連続壁周辺部の地盤を補強
する。この方法を取ることにより、必要な箇所に必要な
強度の地盤改良層を適宜形成することができる。なお、
地中連続壁１２の外壁面のカッティングは、掘削機４０
で外壁上端から下方に向けて連続壁１２をオーバーラッ
プするようにカッティングしても、また、掘削機４０を
制御して発進部２５付近をカッティングしてもよい。<B> Method for forming ground improvement layer After the outer wall of the shaft 10 is formed by the underground continuous wall 12, the excavator 40 is used to excavate the periphery of the shaft 10 from the surface of the shaft, and the stabilizing liquid 42 is provided in the excavation groove. Is filled. The outer wall surface of the underground continuous wall 12 from which the shield machine 30 starts is cut by, for example, about 50 mm. Then, the excavation groove and the cutting portion 23 are filled with a high-strength ground improvement material such as mortar or concrete having high strength. For example, the tremie pipe 43 is arranged below the excavation groove, and the mortar 44 is injected into the excavation groove 20 through the tremie pipe 43 to replace the stabilizing liquid 42. Excavation trench 20
The whole may be filled with the high-strength ground improvement material, or the stabilizing liquid 42 above the high-strength ground improvement layer 21 near the shield machine starting part 25 is solidified with the solidifying material to form the low-strength ground improvement layer 22. May be. In this way, the formation of the excavation groove 20 and the filling of the ground improvement material are repeated while overlapping each other to reinforce the ground around the underground continuous wall of the vertical shaft where the shield machine 30 starts. By adopting this method, it is possible to appropriately form a ground improvement layer having a required strength at a required location. In addition,
The cutting of the outer wall surface of the underground continuous wall 12 is performed by the excavator 40.
The continuous wall 12 may be cut downward from the upper end of the outer wall so as to overlap, or the excavator 40 may be controlled to cut the vicinity of the starting portion 25.
【００１３】[0013]
【発明の効果】本発明は、次のような格別な効果を得る
ことができる。
＜イ＞地盤を掘削して地盤改良を行うので、地盤の種類
にかかわらず全ての地盤に本発明を適用することができ
る。
＜ロ＞シールド機が通過する部分はモルタルなどで高強
度に補強し、その他の部分を高強度に補強するか、又は
安定液を固化するなど低強度に補強するか、適宜地盤改
良方法を選択できるので、地盤改良体の強度を自由に調
整することができる。
＜ハ＞立坑の外壁面をカッティングし、地盤改良体を形
成することにより、止水性を向上することができる。
＜ニ＞地盤の掘削孔に地盤改良体を形成するので、品質
に対して高い信頼性を得ることができる。According to the present invention, the following special effects can be obtained. <B> Since the ground is excavated to improve the ground, the present invention can be applied to all the ground regardless of the type of the ground. <B> Reinforce the portion through which the shield machine passes with high strength with mortar, etc. and reinforce other portions with high strength, or reinforce the low strength by solidifying the stabilizing solution, etc., select the ground improvement method as appropriate Therefore, the strength of the ground improvement body can be freely adjusted. <C> By cutting the outer wall surface of the vertical shaft to form the ground improvement body, the water stopping performance can be improved. <D> Since the ground improvement body is formed in the excavation hole in the ground, high reliability with respect to quality can be obtained.
【図１】地盤改良された立坑周辺部に向けてシールド機
が発進する説明図FIG. 1 is an explanatory diagram in which a shield machine is started toward the periphery of a shaft with improved ground.
【図２】図１のＩＩ−ＩＩの断面図FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】地盤改良用掘削溝の掘削例の説明図FIG. 3 is an explanatory diagram of an example of excavating a ground improvement excavation groove.
【図４】掘削機による掘削と地盤改良の説明図[Fig. 4] Illustration of excavation by an excavator and ground improvement
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) E21D 9/06 E02D 3/12 E02D 5/18 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) E21D 9/06 E02D 3/12 E02D 5/18
Claims (4)
坑周辺のシールド機発進部の地盤改良方法において、 地表からシールド機発進部付近の地盤まで掘削溝を形成
し、前記シールド機発進部付近の立坑の外壁面をカッティン
グし、 前記 掘削溝及び前記外壁面のカッティング部に地盤改良
層を形成することを特徴とする、 シールド機発進部の地盤改良方法。1. A method for improving ground in a shield machine starting part around a shaft when starting a shield machine from a vertical shaft, wherein an excavation groove is formed from the surface of the ground to the ground near the shield machine starting part, and the excavation groove near the shield machine starting part is formed . Cut the outer wall of the shaft
Grayed, and the excavation and thereby forming a ground improvement layer to the cutting section of the outer wall surface, soil improvement method of the shield machine starting part.
坑周辺のシールド機発進部の地盤改良方法において、 地表からシールド機発進部付近の地盤まで掘削溝を形成
し、前記シールド機発進部付近の立坑の外壁面をカッティン
グし、 前記掘削溝及び前記外壁面のカッティング部に複数の種
類の地盤改良層を形成 することを特徴とする、 シールド機発進部の地盤改良方法。2. A method for improving ground in a shield machine starting part around a shaft when starting a shield machine from a vertical shaft, wherein an excavation groove is formed from the ground surface to the ground near the shield machine starting part, and the shield machine starting part near the shield machine starting part is formed . Cut the outer wall of the shaft
A plurality of seeds on the cutting portion of the excavation trench and the outer wall surface.
A ground improvement method for a shield machine starting part, characterized by forming a ground improvement layer of a similar class .
坑周辺のシールド機発進部の地盤改良方法において、 地表からシールド機発進部付近の地盤まで掘削溝を形成
し、 前記シールド機発進部付近の立坑の外壁面をカッティン
グし、 前記 シールド機発進部付近の前記掘削溝及び前記外壁面
のカッティング部に高強度の地盤改良材を充填し、 前記掘削溝の他の部分に低強度の地盤改良材を充填する
こと を特徴とする、 シールド機発進部の地盤改良方法。3. A method for improving ground in a shield machine starting part around a shaft when starting a shield machine from a vertical shaft, wherein an excavation groove is formed from the ground surface to the ground near the shield machine starting part.
Then, cut the outer wall of the shaft near the start of the shield machine.
Grayed, the excavation and the outer wall surface near the shield machine starting unit
The cutting part is filled with high-strength ground improvement material, and the other part of the trench is filled with low-strength ground improvement material.
A method for improving the ground at the start part of the shield machine, which is characterized in that
坑周辺のシールド機発進部の地盤改良方法において、地表からシールド機発進部付近の地盤まで掘削溝を形成
すると共に掘削溝に安定液を充填させ、 前記 シールド機発進部付近の立坑の外壁面をカッティン
グし、前記シールド機発進部付近の前記掘削溝及び前記外壁面
のカッティング部の安定液を高強度地盤改良材で置換
し、 前記掘削溝の安定液を固化材で固化させること を特徴と
する、 シールド機発進部の地盤改良方法。4. A stand for starting a shield machine from a vertical shaft.
In the ground improvement method of the shield machine starting part around the mine , an excavation groove is formed from the ground surface to the ground near the shield machine starting part.
Excavation in to fill the stabilizing solution, and cutting the outer wall surface of the vertical shaft in the vicinity of the shield machine starting part, the excavation and the outer wall surface near the shield machine starting unit as well as
Replacing the stabilizing solution in the cutting part with a high-strength ground improvement material
Then, a method for improving the ground in the shield machine starting part is characterized in that the stabilizing liquid in the excavation trench is solidified with a solidifying material .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28059593A JP3470164B2 (en) | 1993-10-14 | 1993-10-14 | Ground improvement method of shield machine start section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28059593A JP3470164B2 (en) | 1993-10-14 | 1993-10-14 | Ground improvement method of shield machine start section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07109886A JPH07109886A (en) | 1995-04-25 |
| JP3470164B2 true JP3470164B2 (en) | 2003-11-25 |
Family
ID=17627229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28059593A Expired - Fee Related JP3470164B2 (en) | 1993-10-14 | 1993-10-14 | Ground improvement method of shield machine start section |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3470164B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5495874B2 (en) * | 2010-03-18 | 2014-05-21 | 大成建設株式会社 | Removal method of shield excavator |
-
1993
- 1993-10-14 JP JP28059593A patent/JP3470164B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07109886A (en) | 1995-04-25 |
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