JPS62101798A - Method of executing submarine tunnel - Google Patents
Method of executing submarine tunnelInfo
- Publication number
- JPS62101798A JPS62101798A JP60242329A JP24232985A JPS62101798A JP S62101798 A JPS62101798 A JP S62101798A JP 60242329 A JP60242329 A JP 60242329A JP 24232985 A JP24232985 A JP 24232985A JP S62101798 A JPS62101798 A JP S62101798A
- Authority
- JP
- Japan
- Prior art keywords
- tunnel
- ground
- undersea
- construction
- soft ground
- 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.)
- Pending
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、東京湾などの極軟弱な海底地盤下に、道路・
鉄道用などの大断面トンネルを施工する場合に適する、
深層混合処理工法を保用した海底トンネルの施工法に関
する。[Detailed Description of the Invention] “Industrial Application Field” The present invention is applicable to roads and
Suitable for constructing large cross-section tunnels for railways, etc.
Concerning a construction method for undersea tunnels that maintains the deep mixing method.
「従来の技術］
海底面からあまり深くない極軟弱な地盤に大断面のトン
ネルを施工する場合は、トンネル周辺を、掘削・施工に
支障がないように、予め強化しておく必要がある。``Conventional technology'' When constructing a large-section tunnel in extremely soft ground that is not very deep below the ocean floor, it is necessary to strengthen the area around the tunnel in advance so that excavation and construction will not be hindered.
地盤を強化する方法としては、
■ 薬／ｐｉ庄人工法
軟弱地盤中にグラウトなどの硬化剤を加圧注入する方法
。Methods for strengthening the ground include: ■ Yaku/Pisho Artificial Method A method in which hardening agents such as grout are injected under pressure into soft ground.
■ 凍結工法 軟弱地盤に液体窒素を吹き付けて凍結させる方法。■ Freezing method A method of spraying liquid nitrogen on soft ground to freeze it.
などがあり、また、補助工法としては、■ 圧気法 掘削中のトンネル内の気圧を高める方法。There are also auxiliary construction methods such as ■ Pressure method A method of increasing air pressure inside a tunnel during excavation.
■ 地下水位低下法 周辺の地下水を汲み上げて地下水位を低下させる方法。■ Groundwater level lowering method A method of lowering the groundwater level by pumping up surrounding groundwater.
などがあって、一般に、これらが組み合わせて用いられ
ている。These are generally used in combination.
［発明が解決しようとする問題点」
しかし、これらの方法は、何れも主として陸上部で有効
な方法であり、陸上部であれば仮に施工中に不具合が生
しても対策は講し易いが、海底部では、水圧と海水の浸
入に対して確実な防護方法とはいえず、シールド又はナ
トム施工時の安全性に対して問題が残る。[Problems to be solved by the invention] However, all of these methods are effective mainly in land areas, where it is easy to take measures even if a problem occurs during construction. However, on the seabed, it cannot be said to be a reliable method of protection against water pressure and seawater intrusion, and problems remain regarding the safety of shielding or natom construction.
また、これらの方法で施工する場合、必要断面が正確に
得難く、薬注範囲の拡大、薬注量の増大などのコストア
ップの要因が多い。Furthermore, when performing construction using these methods, it is difficult to obtain the required cross section accurately, and there are many factors that increase costs, such as expanding the chemical injection range and increasing the chemical injection amount.
本発明は、これらの問題点を解決しようとするものであ
り、更に、周辺の軟弱地盤を確実に強化して、強力な海
底トンネルを施工しようとするものである。The present invention aims to solve these problems, and further aims to construct a strong undersea tunnel by reliably strengthening the surrounding soft ground.
「問題点を解決するための手段」
本発明は、海底トンネルの施工に先行して、トンネル周
辺の軟弱地盤の必要範囲を（地盤強度が充分確保される
ところは除く）、主としてセメント系硬化剤を用いた深
層混合処理工法により改良、強化し、そののち、シール
ド工法、ナトム工法などにより海底トンネルを施工する
方ｆ去である。``Means for Solving the Problems'' The present invention provides, prior to the construction of an undersea tunnel, a necessary area of soft ground around the tunnel (excluding areas where sufficient ground strength is ensured) using mainly a cement-based hardening agent. The best option is to improve and strengthen the tunnel using a deep mixing method using a deep mixing method, and then construct an undersea tunnel using the shield method, natom method, etc.
なお、その改良強度は、掘削時に周辺の土圧、水圧に耐
えられること及び掘削に対して支障がないものとする。The improved strength shall be such that it can withstand the surrounding earth pressure and water pressure during excavation, and that it does not pose a problem to excavation.
「作用」
如上の構成であるから、改良、強化されたトンネル周辺
の軟弱地盤は、掘削時の水圧、海水の浸入に対して防護
する。``Operation'' With the above structure, the soft ground around the improved and strengthened tunnel will be protected against water pressure during excavation and seawater intrusion.
また、このようにして全面強化された地盤は、透水係数
が小さく、強度が均一なため、トンネルの掘削を安全か
つ能率的に行うことを可能にする。Additionally, the ground that has been fully reinforced in this way has a low permeability coefficient and uniform strength, making it possible to excavate tunnels safely and efficiently.
「実施例」
第１図は、環Ｎ混合処理を施した地盤内にトンネルを通
す場合の縦断面である。図において、■は、地盤改良に
係る極軟弱地霊くＮ値＝０〜５）、２は、該極軟弱地盤
の下層に位置する砂質地盤（Ｎ値＞１０）、３は、改良
地盤４に施工する海底トンネルを示している。``Example'' FIG. 1 is a longitudinal cross-section of a case where a tunnel is passed through the ground that has been subjected to ring-N mixing treatment. In the figure, ■ indicates extremely soft ground related to ground improvement (N value = 0 to 5), 2 indicates sandy ground located below the extremely soft ground (N value > 10), and 3 indicates improved ground. 4 shows the undersea tunnel to be constructed.
地盤の改良強度は、トンネルの施工条件によって変え、
コストダウンを図るものとする。Ａ部は、トンネルが海
底面から進入する場所のため、他の場所（Ｂ部、０部）
より改良強度を大とする。Ｂ部は、直線部分で、最も安
全に施工できる区間のため、改良強度が小さくて良い。The strength of the ground improvement varies depending on the tunnel construction conditions.
The aim is to reduce costs. Part A is the place where the tunnel enters from the seabed, so other places (part B, part 0)
Increase the improved strength. Section B is a straight section and is the safest section to construct, so the improvement strength may be small.
また、０部は、直線ではあるが、トン名ル突き合わせ箇
所（ジョイト箇所）となっているため、一般の直線部よ
り強度を上げて施工する。In addition, although part 0 is a straight line, it is a jointed part (joint part), so it is constructed with higher strength than a general straight part.
その１． シールド工法による場合
第２図、第３図は、シールド工法による場合を示し、第
２図は、（・ン不ル周辺の極軟弱池磐１を全面改良する
場合、築３図は、掘削部分を除いて部分改良する場合の
一例を示している。なお、未改良部分の寸法などについ
ては、各所トンネルの施工条（’１などにより変えるも
のとする。Part 1. When using the shield method Figures 2 and 3 show the case where the shield method was used. The figure shows an example of partial improvement except for the parts.The dimensions of the unimproved parts are subject to change depending on the construction conditions of the tunnel ('1, etc.).
その２． ナトムによる場合
第４図、第５図は、ナトムによる場合を示し、第４図は
、トンネル周辺の極軟弱地盛ｌを全面改良する場合、第
５図は、掘削部分を除いて部分改良する場合の一例を示
している。なお、未改良部分の寸法などについては、前
記シールド工法の場合と同様とする。Part 2. When using Natom Figures 4 and 5 show the case using Natom. Figure 4 shows the case where the extremely soft ground around the tunnel is completely improved, and Figure 5 shows the case where the area is partially improved except for the excavated part. An example of a case is shown below. The dimensions of the unimproved portion will be the same as in the case of the shield method.
「発明の効果」
本発明によれば、施工の安全性を著しく向上でき、また
、その安全性の高さから、所定の工期内に所定のコスト
で施工が可能で、総合的にコストダウンが図れ、しかも
、周辺の軟弱地盤を確実に強化して、強力な海底トンネ
ルを施工できる。以下にその具体的理由を列挙する。"Effects of the Invention" According to the present invention, the safety of construction can be significantly improved, and due to the high safety, construction can be carried out within a prescribed construction period and at a prescribed cost, resulting in overall cost reduction. Furthermore, it is possible to construct a strong undersea tunnel by reliably strengthening the surrounding soft ground. The specific reasons are listed below.
ｌ）改良地盤において、＃ＪＡ械的攪拌と接合と乙こよ
り必要強度が均一に得られる。l) In improved soil, the required strength can be obtained uniformly through #JA mechanical stirring, bonding, and jointing.
２）改良地盤の改良強度が目的に応し変えられる。2) The strength of the improved ground can be changed depending on the purpose.
３）地盤改良が必要な寸法だけ正確に行えて無駄がない
。3) Ground improvement can be carried out accurately to the required dimensions, eliminating waste.
４）地盤改良によりシールド機の掘削反力が容易にとれ
、姿勢制御がし易い。4) By improving the ground, the excavation reaction force of the shield machine can be easily taken care of, making it easier to control the attitude.
５）均一な改良地盤によりトンネルの浮力が部分的に太
き（なるようなことがなく、全体的に土かぶりを少なく
できる。5) The uniform improved ground prevents the buoyancy of the tunnel from becoming thicker in some areas, reducing overall soil cover.
６）シールドとシールドの突き合わせ部及び上り線、下
り線の連絡通路部などは、手掘りを併用するので元来危
険性が高いが、地盤が改良、強化されることにより安全
に施工できる。6) The areas where the shields meet and the connecting passages for the up and down lines are inherently dangerous because hand digging is used, but they can be constructed safely if the ground is improved and strengthened.
７）取付進入部の使用スペース（勾配スペース）がを利
になり、勾配部分の距離が短くなる。7) The space used for the installation entrance (slope space) becomes more advantageous, and the distance of the slope portion becomes shorter.
８）施工時及び完成後における地震などの際には、周辺
地盤に対する防護となる。8) It will protect the surrounding ground in the event of an earthquake during construction or after completion.
図面は、本発明の実施例で、第１図は、縦断側面図、第
２図乃至第５ＦＩ！Ｊは、それぞれ異なる具体例を示す
縦断正面図である。
１・・・極軟弱地盤 ２・・・砂質地盤３・・・海
底トンネル ４・・・改良地盤特許出願人 株式会社
竹中工務店
第２図
第３図
第４図
ｌ ３−
第５図
手晴補正書
昭和６０年１１月１１日
１、事件の表示 昭和６０年１０月２９日提出の特許
側２、発明の名称 海底トンネルの施工法３、補正をす
る者
事件との関係 特許出願人
住 所 大阪府大阪市東区本町４丁目２７番地名 称
に株式会社 作中工務店 汐目名）代表者 竹
中 統 −
４、代 理 人
住 所 東京都新宿区新宿２−４−３大（訓２ビルＩ
ＩＦ６、補正の対象 明細書の発明の詳細な説明の欄
補正の内容
明細書第６頁第２行と同第３行との行間に次を加入する
。
「なお、以上の実施例にあっては、第２図、第４図に示
すように、改良地盤上面からトンネル上面までの距Ｓ４
ａと、改良地盤上面からトンネル側面までの距離すと
の関係を、ａ＃ｂにするのが望ましい。」
以 上The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view, and FIGS. 2 to 5FI! J is a longitudinal sectional front view showing different specific examples. 1...Extremely soft ground 2...Sandy ground 3...Undersea tunnel 4...Improved ground patent applicant Takenaka Corporation Figure 2 Figure 3 Figure 4 l 3- Figure 5 Hand Clear amendment dated November 11, 1985 1. Indication of the case Patent submitted on October 29, 1985 2. Title of the invention Construction method for undersea tunnels 3. Relationship with the case of the person making the amendment Residence of the patent applicant Address: 4-27 Honmachi, Higashi-ku, Osaka, Osaka Prefecture Name:
(Sakuchu Construction Co., Ltd. Shiome) Representative Take
Chuo-4, Deputy Address: Shinjuku 2-4-3 University, Shinjuku-ku, Tokyo (Kun 2 Building I)
IF6, Subject of amendment Contents of amendment in the Detailed Description of the Invention column of the specification Add the following between the second and third lines of page 6 of the specification. ``In addition, in the above embodiment, as shown in FIGS. 2 and 4, the distance S4 from the top surface of the improved ground to the top surface of the tunnel is
It is desirable that the relationship between a and the distance from the top surface of the improved ground to the tunnel side be set to a#b. "that's all
Claims (3)
ルを施工する際に、予め、トンネル周辺の軟弱地盤を、
深層混合処理工法により改良、強化したのち施工するこ
とを特徴とする海底トンネルの施工法。(1) When constructing an undersea tunnel using the shield method, Natom method, etc., it is necessary to prepare the soft ground around the tunnel in advance.
A construction method for undersea tunnels that is characterized by improving and strengthening the tunnel using the deep mixing method.
請求の範囲第１項記載の海底トンネルの施工法。(2) The method for constructing an undersea tunnel according to claim 1, which comprises improving the front surface of the soft ground around the tunnel.
の不要部分を除いて部分改良して成る特許請求の範囲第
１項記載の海底トンネルの施工法。(3) The method for constructing an undersea tunnel according to claim 1, wherein the soft ground around the tunnel is partially improved by removing unnecessary parts such as tunnel excavations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60242329A JPS62101798A (en) | 1985-10-29 | 1985-10-29 | Method of executing submarine tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60242329A JPS62101798A (en) | 1985-10-29 | 1985-10-29 | Method of executing submarine tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62101798A true JPS62101798A (en) | 1987-05-12 |
Family
ID=17087573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60242329A Pending JPS62101798A (en) | 1985-10-29 | 1985-10-29 | Method of executing submarine tunnel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62101798A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006016962A (en) * | 2005-06-16 | 2006-01-19 | Ohbayashi Corp | Method for preventing ground deformation |
| JP2010126997A (en) * | 2008-11-27 | 2010-06-10 | Ohbayashi Corp | Method and structure for preventing subsidence of shield machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138696A (en) * | 1983-01-31 | 1984-08-09 | 東亜建設工業株式会社 | Sea bottom tunnel construction method |
-
1985
- 1985-10-29 JP JP60242329A patent/JPS62101798A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59138696A (en) * | 1983-01-31 | 1984-08-09 | 東亜建設工業株式会社 | Sea bottom tunnel construction method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006016962A (en) * | 2005-06-16 | 2006-01-19 | Ohbayashi Corp | Method for preventing ground deformation |
| JP4525480B2 (en) * | 2005-06-16 | 2010-08-18 | 株式会社大林組 | Ground deformation prevention method |
| JP2010126997A (en) * | 2008-11-27 | 2010-06-10 | Ohbayashi Corp | Method and structure for preventing subsidence of shield machine |
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