JPH063024B2 - Annular pressure caisson - Google Patents
Annular pressure caissonInfo
- Publication number
- JPH063024B2 JPH063024B2 JP2149074A JP14907490A JPH063024B2 JP H063024 B2 JPH063024 B2 JP H063024B2 JP 2149074 A JP2149074 A JP 2149074A JP 14907490 A JP14907490 A JP 14907490A JP H063024 B2 JPH063024 B2 JP H063024B2
- Authority
- JP
- Japan
- Prior art keywords
- annular
- side wall
- caisson
- blade
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、地中に埋設されるコンクリート構造物からな
り、大規模の地下空間を得るのに適した環状圧気ケーソ
ンに関する。Description: TECHNICAL FIELD The present invention relates to an annular pressure caisson composed of a concrete structure buried in the ground and suitable for obtaining a large-scale underground space.
（従来の技術） 第３図は、鉄筋コンクリートから成るこの種の従来の環
状圧気ケーソンを示すもので、図中100は環状圧気ケー
ソン本体で、外環状側壁101と、その内側に位置する内
環状側壁102とを備えている。また、103は圧気作業室天
井、104は外環状刃口、105は外環状刃口104とほぼ同形
状の内環状刃口で、これらにより圧気作業室106が区画
形成されている。(Prior Art) FIG. 3 shows a conventional annular pneumatic caisson of this type made of reinforced concrete, in which 100 is an annular pneumatic caisson body, an outer annular side wall 101 and an inner annular side wall located inside thereof. 102 and. Further, 103 is a ceiling of the pneumatic working chamber, 104 is an outer annular blade, 105 is an inner annular blade having substantially the same shape as the outer annular blade 104, and these define a pneumatic working chamber 106.
なお、Ｇ０は圧気作業室106部分の地盤である。In addition, G 0 is the ground of the pneumatic working chamber 106 portion.
しかして、圧気作業室106内には、周知のように送気管
（図示せず）により、掘削地盤深さに相当する地下水圧
に対抗する圧気が送られ、高気圧下となっており、地盤
Ｇ０が入力あるいは機械力により掘削され、それに伴っ
てケーソンの自重により外・内環状刃口105,104が沈
下、ひいては環状ケーソン本体が沈設されるものであ
る。As is well known, a pneumatic pipe (not shown) sends compressed air against the groundwater pressure corresponding to the depth of the excavated ground into the compressed air working chamber 106, which is under high pressure. 0 is excavated by input or mechanical force, and the outer / inner annular blades 105, 104 are sunk by the weight of the caisson, and the annular caisson body is subsequently sunk.
（発明が解決しようとする課題） しかしながら、この場合、外・内環状刃口105,104を均
等に沈下させるべく地盤Ｇ０を均等に掘削できないこと
がある。このような場合、環状圧気ケーソン本体100は
僅かに傾斜するため、圧気作業室(106)内の圧気が、外
環状刃口(104)または内環状刃口(105)の先端から、矢印
ａで示すように漏気することがあり、特に外環状側壁(1
01)側への漏気では、その漏気が外環状側壁(101)に沿っ
て上昇するとき、周囲の外周地盤Ｇを損傷し、その崩壊
や沈下等を起こすことがあり、極めて危険であるという
課題があった。(Problems to be Solved by the Invention) However, in this case, it may not be possible to evenly excavate the ground G 0 in order to evenly sink the outer and inner annular blade openings 105, 104. In such a case, since the annular pressure air caisson main body 100 is slightly inclined, the pressure air inside the pressure air working chamber (106) is indicated by the arrow a from the tip of the outer annular blade (104) or the inner annular blade (105). May leak as shown, especially the outer annular sidewall (1
When leaking to the 01) side, when the leak rises along the outer annular side wall (101), it may damage the surrounding outer ground G and cause collapse or subsidence, which is extremely dangerous. There was a problem.
また、外周地盤Ｇへ漏気するとき、周辺の地下室やトン
ネルに漏気し、その際、高圧空気が地質中に含まれてい
る末酸化鉱物と反応し酸欠空気となって地下室等へ漏出
し、重大な事故を誘発する原因となる、といった課題も
あった。Also, when air leaks to the outer ground G, it leaks to the surrounding basements and tunnels, and at that time, the high-pressure air reacts with the unoxidized minerals contained in the geology and becomes oxygen-deficient air, which leaks to the basement. However, there was also a problem that it causes a serious accident.
本発明はこのようなことに鑑み提案されたもので、その
目的とするところは、外環状側壁101の周囲の地盤損
傷、崩壊等を防止、かつ外周地盤側での酸欠空気発生の
阻止を図った環状圧気ケーソンを提供するにある。The present invention has been proposed in view of the above circumstances, and its object is to prevent ground damage around the outer annular side wall 101, collapse, etc., and prevent generation of oxygen-deficient air on the outer ground side. Providing a circular annular pressure caisson designed.
（課題を解決するための手段） 本発明では、外環状側壁と内環状側壁とを有する環状圧
気ケーソンにおいて、 前記外環状側壁の下部に設けられた外環状刃口の長さを
前記内環状側壁の内環状刃口の長さより下方に長く延設
する構成とし、上記目的を達成している。(Means for Solving the Problem) In the present invention, in an annular pressure caisson having an outer annular side wall and an inner annular side wall, a length of an outer annular blade provided at a lower portion of the outer annular side wall is set to the inner annular side wall. The above object is achieved by the structure in which the inner annular blade is extended longer than the length of the inner annular blade.
また、外・内環状側壁の各刃口の長さはほぼ同寸で、か
つ内環状刃口の下部に凹部を設けることにより、上記目
的を達成している。Further, the above-described object is achieved by providing the outer and inner annular side walls with respective blade openings having substantially the same length and providing a recess at the lower portion of the inner annular blade opening.
（作用） 本発明では上記のように構成することにより、内環状刃
口部分から環状作業室内の高圧空気を外部へ漏出するよ
うにしている。(Operation) In the present invention, with the above-mentioned configuration, the high pressure air in the annular working chamber is leaked to the outside from the inner annular blade opening portion.
（実施例１） 第１図は本発明の第１実施例を示す。図中（１）は、例
えば円環状となっている鉄筋コンクリート製の環状圧気
ケーソン本体を示す。ここで、環状とは、ケーソン本体
の断面が閉じているものを意味し、その形が円型、角
形、その他の形状であっても良い。(Embodiment 1) FIG. 1 shows a first embodiment of the present invention. In the figure, ( 1 ) indicates an annular pressure caisson body made of, for example, an annular reinforced concrete. Here, the term “annular” means that the cross section of the caisson body is closed, and the shape thereof may be circular, square, or any other shape.
しかして、上記環状圧気ケーソン本体（１）は、外側に
位置する外環状側壁（２）と、その内側に間隔を介して
位置する内環状側壁（３）とを有し、これらの下方であ
って内環状側壁（３）と外環状側壁（２）との間には作
業室天井（４）が設けられている。また、外環状側壁
（２）の下方延長線状には外環状刃口（５）が、内環状
側壁（３）の下方延長線状にも内環状刃口（６）がそれ
ぞれ設けられている。The annular pressure caisson body ( 1 ) has an outer annular side wall (2) located outside and an inner annular side wall (3) located inside of the outer side wall (2) with a space therebetween. A work chamber ceiling (4) is provided between the inner annular side wall (3) and the outer annular side wall (2). Further, an outer annular cutting edge (5) is provided on the downward extending line of the outer annular side wall (2), and an inner annular cutting edge (6) is also provided on the downward extending line of the inner annular side wall (3). .
（７）はこれら外・内環状刃口（５），（６）、作業室
天井（４）、およびその下側の内部地盤Ｇ１とによって
区画形成された環状作業室、（８）は作業室天井（４）
に設けられた開口、（９）は開口（４）から地上側に延
びる適数のシャフト、(10)はその上部に設けられたエア
ロックである。(7) is an annular working chamber defined by these outer / inner annular cutting edges (5) and (6), the working chamber ceiling (4), and the internal ground G 1 below it, and (8) is the working Room ceiling (4)
The opening (9) is an appropriate number of shafts extending from the opening (4) to the ground side, and (10) is an airlock provided above the shaft.
なお、外環状刃口（５）の外側壁面は、外環状側壁
（２）に外側壁面より若干外側に突出した段部（５ａ）
を有しており、環状圧気ケーソン本体（１）の沈設に際
して外周地盤Ｇとの間に外間隙(11)が形成され、これ
に、ベントナイト溶液等の周知の潤滑材が注入される。
内環状刃口（６）の内側壁面も段部（６ａ）を有し、内
環状側壁（３）の内側壁面より同様に突出しており、内
周盤Ｇとの間に内間隙(11′)が形成される。同様に潤滑
材が充填され また、この場合、本発明において、外環状刃口（２）の
段部（５ａ）から外環状刃口（５）の下端までの高さＨ
は内環状刃口（６）の段部（６ａ）から内環状刃口
（３）の下端までの高さｈよりａだけ低くなっている。
換言すると、外環状刃口（２）の長さは内環状刃口
（３）よりもａだけ長く下方に延設されている。このａ
の寸法は環状圧気ケーソン（１）の規模により適宜最適
のものが採択される。In addition, the outer wall surface of the outer annular blade (5) has a stepped portion (5a) protruding slightly outward from the outer wall surface of the outer annular side wall (2).
When the annular pressure caisson body ( 1 ) is sunk, an outer gap (11) is formed between it and the outer peripheral ground G, and a well-known lubricant such as bentonite solution is injected into this.
The inner wall surface of the inner annular blade mouth (6) also has a step portion (6a) and similarly projects from the inner wall surface of the inner annular side wall (3), and an inner gap (11 ') is formed between the inner peripheral plate G and the inner peripheral plate G. Is formed. Similarly, the lubricant is filled in this case, in the present invention, the height H from the step (5a) of the outer annular blade (2) to the lower end of the outer annular blade (5).
Is lower than the height h from the step (6a) of the inner annular blade (6) to the lower end of the inner annular blade (3) by a.
In other words, the length of the outer annular blade (2) is extended downward by a and is longer than that of the inner annular blade (3). This a
The optimum size is selected according to the size of the annular pressure caisson ( 1 ).
その他、Ｗは地下水、Ｗ′は作業室内地下水である。In addition, W is groundwater and W'is groundwater in the working room.
しかして、環状圧気ケーソン本体（１）の沈設にあた
り、環状作業室（７）は、地上に設置されたコンプレッ
サおよび送気管等（図示せず）を介し送気され、内部の
空気圧が内環状刃口（６）の下端までの水頭圧に等しい
圧力に維持され、環状作業室（７）内において人力また
は機械力等により内部地盤Ｇ１が掘削され、掘削土砂
は、例えばケーソンバケット（図示せず）に積込まれ、
開口（８）およびシャフト（９）を経てエアロック(10)
より大気圧下の地上側へ排出される。Then, when the annular pressure caisson body ( 1 ) is sunk, the annular working chamber (7) is supplied with air through a compressor and an air supply pipe (not shown) installed on the ground, and the internal air pressure is reduced to the inner annular blade. The internal ground G 1 is excavated by manpower or mechanical force in the annular work chamber (7) while maintaining a pressure equal to the water head pressure to the lower end of the mouth (6), and excavated soil is, for example, caisson bucket (not shown). ),
Airlock (10) through opening (8) and shaft (9)
It is discharged to the ground side under more atmospheric pressure.
これらの過程において、環状作業室（７）内の高圧空気
は、過剰圧になったり、環状圧気ケーソン本体（１）が
傾いたような場合、寸法ａだけ短い内環状刃口（３）の
下端から矢印Ｐで示すように高圧空気が外部に漏出し、
内環状側室（３）の内側壁に沿って上昇したり、内部地
盤Ｇ１側へ漏出し、外環状刃口（２）の下端部は常に地
下水位以下にあるため、ここから高圧空気が外周地盤Ｇ
へ漏出することなく、安全に環状圧気ケーソン（１）を
沈設することができる。In these processes, the high-pressure air in the annular working chamber (7) becomes overpressured, or when the annular pressure caisson body ( 1 ) is tilted, the lower end of the inner annular blade (3) shorter by the dimension a. As shown by the arrow P, high pressure air leaks to the outside,
As it rises along the inner side wall of the inner annular side chamber (3) and leaks to the inner ground G 1 side, and the lower end of the outer annular blade (2) is always below the groundwater level, high pressure air flows from here. Ground G
The annular pressure caisson ( 1 ) can be safely sunk without leaking to the.
（実施例２） 第２図(a)〜(c)は本発明の第２実施例を示すもので、こ
の実施例では、内環状刃口（６−１）の高さは外環状刃
口（５）と同じ高さとなっており、内環状刃口（６−
１）の下部の全周に対し、複数の切欠き状の凹部（６−
２）を適間隔でてもって設け、この凹部（６−２）を介
し環状作業室（７）の過剰空気や、環状圧気ケーソン本
体（１）が傾いたりした時に高圧空気Ｐを内部地盤Ｇ１
側へ漏出するようにしたことに特徴を有している。(Embodiment 2) FIGS. 2 (a) to (c) show a second embodiment of the present invention. In this embodiment, the height of the inner annular cutting edge (6-1) is the outer annular cutting edge. It has the same height as (5), and the inner annular blade (6-
1) A plurality of notched recesses (6-
2) are provided at appropriate intervals, and when the excess air in the annular working chamber (7) or the annular pressure caisson body ( 1 ) is tilted through the recess (6-2), the high pressure air P is supplied to the internal ground G 1.
The feature is that it leaks to the side.
その他の構成、作用は前述の実施例と同様であるので、
説明の重複を避けるために同じ部材は同一符号で示しそ
れらの説明は省略する。Other configurations and operations are similar to those of the above-described embodiment,
In order to avoid duplication of description, the same members are designated by the same reference numerals and their description is omitted.
（発明の効果） 以上のように構成した本発明によれば、環状作業室内の
高圧空気を内周地盤側へ漏出するようにしたため、外環
状刃口側から高圧空気が漏出せず、よって外周地盤Ｇを
傷めず、周辺地盤崩壊や地上の沈下を防止することがで
きる。(Effect of the Invention) According to the present invention configured as described above, since the high pressure air in the annular working chamber is leaked to the inner peripheral ground side, the high pressure air does not leak from the outer annular blade opening side, and thus the outer circumference The ground G can be prevented from being damaged and the surrounding ground collapse and ground subsidence can be prevented.
また、周辺地盤への高圧空気の漏出がないため、周辺の
トンネルや地下室へ酸欠空気を送ることがなく、安全性
が向上する、といった効果がある。In addition, since high-pressure air does not leak to the surrounding ground, oxygen-deficient air is not sent to the surrounding tunnels and basements, and safety is improved.
【図面の簡単な説明】 第１図(a)は本発明の第１実施例の縦断面図、(b)図は同
上Ａ−Ａ線断面図、第２図(a)は本発明の第２実施例の
縦断面図、(b)図は同上のＢ−Ｂ線から見た底面図、(c)
図は部分斜視図、第３図は従来例を示す。 １・・・・・環状圧気ケーソン本体 ２・・・・・外環状側壁 ３・・・・・内環状側壁 ４・・・・・圧気作業室天井 ５・・・・・外環状刃口 ５ａ，６ａ・段部 ６，６−１・内環状刃口 ７・・・・・環状作業室BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a vertical sectional view of a first embodiment of the present invention, FIG. 1 (b) is a sectional view taken along the line AA of the same as above, and FIG. 2 is a vertical sectional view of the embodiment, (b) is a bottom view seen from the line BB in the same, (c)
The figure shows a partial perspective view, and FIG. 3 shows a conventional example. 1 ... Annular pressure air caisson main body 2 ... Outer annular side wall 3 ... Inner annular side wall 4 ... Compressed air work chamber ceiling 5 ... Outer annular blade 5a, 6a, step 6, 6-1, inner annular blade 7 ... annular working chamber
Claims (2)
とを有する環状圧気ケーソンにおいて、 前記外環状側壁の下部に設けられた外環状刃口の長さを
前記内環状側壁の内環状刃口の長さより下方に長く延設
したことを特徴とする環状圧気ケーソン。1. An annular pressure caisson having an outer annular side wall, an inner annular side wall, and an annular pressure working chamber, wherein the length of an outer annular blade provided at the lower portion of the outer annular side wall is the inner annular side of the inner annular side wall. An annular pressure caisson characterized by being extended below the length of the blade.
とを有する環状圧気ケーソンにおいて、 前記外・内環状側壁の各刃口の長さはほぼ同寸で、かつ
内環状刃口の下部に凹部を設けたことを特徴とする環状
圧気ケーソン。2. An annular pressure caisson having an outer annular side wall, an inner annular side wall and an annular pressure air working chamber, wherein the lengths of the blade edges of the outer and inner annular side walls are substantially the same, and An annular pressure caisson with a recess at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2149074A JPH063024B2 (en) | 1990-06-07 | 1990-06-07 | Annular pressure caisson |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2149074A JPH063024B2 (en) | 1990-06-07 | 1990-06-07 | Annular pressure caisson |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33886294A Division JPH07252846A (en) | 1994-12-28 | 1994-12-28 | Pneumatic caisson |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0441818A JPH0441818A (en) | 1992-02-12 |
| JPH063024B2 true JPH063024B2 (en) | 1994-01-12 |
Family
ID=15467124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2149074A Expired - Lifetime JPH063024B2 (en) | 1990-06-07 | 1990-06-07 | Annular pressure caisson |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH063024B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07252846A (en) * | 1994-12-28 | 1995-10-03 | Daiho Constr Co Ltd | Pneumatic caisson |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63130824A (en) * | 1986-11-21 | 1988-06-03 | Ohbayashigumi Ltd | Floating caisson and excavation below cutting edge thereof |
-
1990
- 1990-06-07 JP JP2149074A patent/JPH063024B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0441818A (en) | 1992-02-12 |
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