JPH07252846A - Pneumatic caisson - Google Patents
Pneumatic caissonInfo
- Publication number
- JPH07252846A JPH07252846A JP33886294A JP33886294A JPH07252846A JP H07252846 A JPH07252846 A JP H07252846A JP 33886294 A JP33886294 A JP 33886294A JP 33886294 A JP33886294 A JP 33886294A JP H07252846 A JPH07252846 A JP H07252846A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- caisson
- air
- work room
- pneumatic
- 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
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Foundations (AREA)
Abstract
Description
【0001】[0001]
【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
適した圧気ケーソンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic caisson composed of a concrete structure buried in the ground and suitable for obtaining a large-scale underground space.
【0002】[0002]
【従来の技術】図3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、1
05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。
なお、G0 は圧気作業室106部分の地盤である。2. Description of the Related Art FIG. 3 shows a conventional annular pressure caisson of this type made of reinforced concrete.
Is an annular pressure air caisson body, and is provided with an outer annular side wall 101 and an inner annular side wall 102 located inside thereof. Further, 103 is a ceiling of the pneumatic working chamber, 104 is an outer annular blade, 1
Reference numeral 05 denotes an inner annular blade having the same shape as the outer annular blade 104,
The pneumatic working chamber 106 is defined by these.
In addition, G 0 is the ground of the pneumatic working chamber 106.
【0003】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 が人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
104,105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。However, 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. The ground G 0 is excavated by manpower or mechanical force, and the outer / inner annular blade openings 104 and 105 are sunk by the weight of the caisson, and the annular caisson body is subsequently sunk.
【0004】[0004]
【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104,105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10
4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101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。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 104 and 105. 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 changed.
4 or the tip of the inner annular blade 105 may leak as indicated by an arrow a. Particularly, when leaking to the outer annular side wall 101 side, when the leak rises along the outer annular side wall 101. However, there is a problem in that the surrounding outer ground G may be damaged and may collapse or sink, which is extremely dangerous.
【0005】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
に含まれている未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 basement and tunnel, and at that time, the high-pressure air reacts with unoxidized minerals contained in the geology and becomes oxygen-deficient air, which is the basement. There was also a problem that it leaked to the etc. and caused a serious accident.
【0006】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、外側壁の周囲の地盤
損傷、崩壊等を防止し、かつ外周地盤側での酸欠空気発
生の阻止を図った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 an object thereof is to prevent ground damage and collapse around the outer wall, and to prevent generation of oxygen-deficient air on the outer ground side. It is to provide a pneumatic caisson with a stop.
【0007】[0007]
【課題を解決するための手段】本発明では、外側壁と内
側壁とを有し、かつその間が圧気作業室となっている圧
気ケーソンにおいて、前記内側壁の下方に、圧気作業室
内の圧気を内側壁の内側へ漏出させる空気流路を形成す
ることにより、上記目的を達成している。According to the present invention, in a pneumatic caisson having an outer wall and an inner wall, and a space between them is a pneumatic working chamber, the compressed air in the pneumatic working chamber is provided below the inner wall. The above object is achieved by forming an air flow path that leaks to the inside of the inner wall.
【0008】[0008]
【作用】本発明では上記のように構成することにより、
内刃口部分から圧気作業室内の高圧空気を外部へ漏出す
るようにしている。In the present invention, with the above-mentioned configuration,
High pressure air inside the compressed air work chamber is leaked to the outside from the inner blade opening.
【0009】[0009]
【実施例1】図1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く、本明細書で単
に圧気ケーソンと言った場合、混乱を避ける意味で円形
の環状形状以外のものとする。First Embodiment FIG. 1 shows a first embodiment of the present invention. 1 in the figure
Indicates an annular pressure air 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, rectangular, or other shape, and when simply referred to as a pressure caisson in the present specification, it is confusing. In order to avoid the above, a shape other than a circular ring shape is used.
【0010】しかして、上記例えば環状の圧気ケーソン
本体1は外側に位置する外側壁2と、その内側に間隔を
介して位置する内側壁3とを有し、これらの下方であっ
て内側壁3と外側壁2との間には作業室天井4が設けら
れている。また、外側壁2の下方延長線状には外刃口5
が、内側壁3の下方延長線状にも内刃口6がそれぞれ設
けられている。However, the above-mentioned annular pressure air caisson body 1 has an outer side wall 2 located outside and an inner side wall 3 located inside the outer side wall 2 with a space therebetween, and the inner side wall 3 below them. A work room ceiling 4 is provided between the outer wall 2 and the outer wall 2. In addition, the outer blade 2 has a downward extension line that has an outer blade opening 5
However, the inner blade openings 6 are also provided in a downward extension of the inner wall 3.
【0011】7はこれら外・内刃口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
された圧気作業室、8は作業室天井4に設けられた開
口、9は開口8から地上側に延びる適数のシャフト、1
0はその上部に設けられたエアロックである。Reference numeral 7 is a compressed air working chamber defined by the outer and inner blade openings 5, 6, the working chamber ceiling 4, and the inner ground G 1 below the working chamber, and 8 is an opening provided in the working chamber ceiling 4. , 9 is an appropriate number of shafts extending from the opening 8 to the ground side, 1
Reference numeral 0 is an airlock provided above the airlock.
【0012】なお、外刃口5の外側壁面は、外側壁2の
外側壁面より若干外側に突出した段部5aを有してお
り、例えば環状の圧気ケーソン本体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。内刃口6
の内側壁面も段部6aを有し、内側壁3の内側壁面より
同様に突出しており、内周地盤Gとの間に内間隙11′
が形成され、同様に潤滑材が充填される。The outer wall surface of the outer blade opening 5 has a step portion 5a which projects slightly outward from the outer wall surface of the outer wall 2. For example, when the annular pressure air caisson main body 1 is sunk, the outer wall surface and the outer ground G are separated. An outer gap 11 is formed therebetween, and a well-known lubricant such as bentonite solution is injected into this. Inner blade mouth 6
The inner wall surface of the inner wall 3 also has a step portion 6a, and protrudes similarly from the inner wall surface of the inner wall 3 to form an inner gap 11 ′ between the inner wall 11 and the inner ground G.
Are formed and are similarly filled with lubricant.
【0013】また、この場合、本発明において、外刃口
5の段部5aから外刃口5の下端までの高さHは内刃口
6の段部6aから内刃口6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、外刃口5の長さは内刃
口6よりもaだけ長く下方に延設されている。このaの
寸法は環状の圧気ケーソン本体1の規模により適宜最適
のものが採択される。その他、Wは地下水、W′は作業
室内地下水である。Further, in this case, in the present invention, the height H from the step 5a of the outer blade opening 5 to the lower end of the outer blade opening 5 is from the step 6a of the inner blade opening 6 to the lower end of the inner blade opening 6. It is lower than the height h by a. In other words, the length of the outer blade opening 5 is extended downward by a and is longer than that of the inner blade opening 6. The size of this a is optimally selected depending on the size of the annular pressure caisson body 1 . In addition, W is groundwater and W'is groundwater in the working room.
【0014】しかして、例えば環状の圧気ケーソン本体
1の沈設にあたり、圧気作業室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、内部の空気圧が内刃口6の下端までの水頭圧に等し
い圧力に維持され、圧気作業室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。Therefore, for example, an annular pressure caisson body
1 is sunk, the pneumatic 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 becomes equal to the head pressure up to the lower end of the inner blade opening 6. The internal ground G 1 is excavated by manpower or mechanical force in the pneumatic working chamber 7, and the excavated soil is loaded in, for example, a caisson bucket (not shown), and the opening 8 is opened.
Then, it is discharged from the airlock 10 through the shaft 9 to the ground side under atmospheric pressure.
【0015】これらの過程において、圧気作業室7内の
高圧空気は、過剰圧になったり、例えば環状の圧気ケー
ソン本体1が傾いたような場合、寸法aだけ短い内刃口
6の下端が高圧空気の空気流路となり矢印Pで示すよう
に高圧空気が外部に漏出し、内側壁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、安全に例えば環状の圧
気ケーソン本体1を沈設することができる。In these processes, the high-pressure air in the pneumatic working chamber 7 becomes excessively high in pressure, or, for example, when the annular pneumatic caisson body 1 is tilted, the lower end of the inner blade opening 6 which is shorter by the dimension a has a higher pressure. The high-pressure air leaks to the outside as shown by an arrow P and becomes an air flow path of air, rises along the inner side wall of the inner side wall 3 or leaks to the inner ground G 1 side, and the lower end portion of the outer blade mouth 2 is Since it is always below the groundwater level, high-pressure air does not leak to the outer peripheral ground G from here, and the annular pressure caisson body 1 can be safely sunk, for example.
【0016】[0016]
【実施例2】図2(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、内刃口6−1の高さは
外刃口5と同じ高さとなっており、内刃口6−1の下部
の全周に対し空気流路となる複数の切欠き状の凹部6−
2を適間隔でもって設け、この凹部6−2を介し圧気作
業室7の過剰空気や、例えば環状の圧気ケーソン本体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。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。また、圧気ケーソン本体は円形の環状形
状以外のものでも同様の作用効果を得ることができる。[Embodiment 2] FIGS. 2A to 2C show a second embodiment of the present invention. In this embodiment, the height of the inner blade opening 6-1 is the same as that of the outer blade opening 5. And a plurality of notched recesses 6- serving as air flow paths around the entire lower portion of the inner blade opening 6-1.
2 are provided at appropriate intervals, and excess air in the compressed air working chamber 7 or, for example, an annular compressed air caisson body 1 is provided through the recess 6-2.
The feature is that the high pressure air P leaks to the inner ground G 1 side when the vehicle tilts. Since other configurations and operations are similar to those of the above-described embodiment, the same members are denoted by the same reference numerals to avoid duplication of description, and the description thereof will be omitted. Further, the same effect can be obtained even if the pressure air caisson body has a shape other than a circular ring shape.
【0017】[0017]
【発明の効果】以上のように構成した本発明によれば、
圧気ケーソンにおいて、圧気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。According to the present invention configured as described above,
In the compressed air caisson, the high pressure air inside the compressed air work room was leaked to the inner peripheral ground side, so high pressure air did not leak from the outer blade mouth side, so the outer peripheral ground G was not damaged, and the surrounding ground collapse and subsidence Can be prevented.
【0018】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。Further, since the high-pressure air does not leak to the surrounding ground, oxygen-deficient air is not sent to the surrounding tunnel or basement, and the safety is improved.
【図1】(a)図は本発明の第1実施例の縦断面図、
(b)図は同上のA−A線断面図。FIG. 1A is a vertical sectional view of a first embodiment of the present invention,
(B) The figure is the sectional view on the AA line same as the above.
【図2】(a)図は本発明の第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。FIG. 2 (a) is a longitudinal sectional view of a second embodiment of the present invention,
The figure (b) is a bottom view seen from the line BB in the above, and the figure (c) is a partial perspective view.
【図3】従来例を示す。FIG. 3 shows a conventional example.
1 圧気ケーソン本体 2 外側壁 3 内側壁 4 作業室天井 5 外刃口 5a,6a 段部 6,6−1 内刃口 7 圧気作業室 1 Pneumatic caisson main body 2 Outer side wall 3 Inner side wall 4 Working chamber ceiling 5 Outer blade openings 5a, 6a Steps 6,6-1 Inner blade opening 7 Pressure working room
Claims (1)
圧気作業室となっている圧気ケーソンにおいて、 前記内側壁の下方に、圧気作業室内の圧気を内側壁の内
側へ漏出させる空気流路を形成したことを特徴とする圧
気ケーソン。1. A compressed air caisson having an outer side wall and an inner side wall, and a space between them is a compressed air working chamber. Air for leaking compressed air inside the compressed air working chamber to the inside of the inner side wall below the inner side wall. A compressed air caisson characterized by forming a flow path.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33886294A JPH07252846A (en) | 1994-12-28 | 1994-12-28 | Pneumatic caisson |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33886294A JPH07252846A (en) | 1994-12-28 | 1994-12-28 | Pneumatic caisson |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2149074A Division JPH063024B2 (en) | 1990-06-07 | 1990-06-07 | Annular pressure caisson |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07252846A true JPH07252846A (en) | 1995-10-03 |
Family
ID=18322102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP33886294A Pending JPH07252846A (en) | 1994-12-28 | 1994-12-28 | Pneumatic caisson |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07252846A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0441818A (en) * | 1990-06-07 | 1992-02-12 | Daiho Constr Co Ltd | Ring-shaped pressure air caisson |
-
1994
- 1994-12-28 JP JP33886294A patent/JPH07252846A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0441818A (en) * | 1990-06-07 | 1992-02-12 | Daiho Constr Co Ltd | Ring-shaped pressure air caisson |
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