JPS63206527A - Settling promoting work for caisson - Google Patents
Settling promoting work for caissonInfo
- Publication number
- JPS63206527A JPS63206527A JP3704687A JP3704687A JPS63206527A JP S63206527 A JPS63206527 A JP S63206527A JP 3704687 A JP3704687 A JP 3704687A JP 3704687 A JP3704687 A JP 3704687A JP S63206527 A JPS63206527 A JP S63206527A
- Authority
- JP
- Japan
- Prior art keywords
- caisson
- air
- ground
- water
- excavation
- 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.)
- Granted
Links
- 230000001737 promoting effect Effects 0.000 title description 3
- 238000009412 basement excavation Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 239000004576 sand Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- 238000010276 construction Methods 0.000 abstract description 6
- 239000002689 soil Substances 0.000 abstract 3
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は水底の地盤中に設置されるケーソンの沈下促
進工法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a construction method for promoting the sinking of a caisson installed in the ground at the bottom of water.
一般的にケーソンの沈下は、ケーソン内部の地盤を機械
により掘削しながら行っている。Generally, a caisson is lowered by mechanically excavating the ground inside the caisson.
したがって、掘削はケーソン全体が均等に沈下するよう
に注意しながら行う必要があり、このため沈設に時間が
掛り、工期が長くなるばかりか多くの労力や大型クレー
ン、機械類などを必要とするなどの問題があった。Therefore, excavation must be carried out with care so that the entire caisson sinks evenly, which not only takes time and construction period, but also requires a lot of labor, large cranes, machinery, etc. There was a problem.
この発明は上記従来法の問題点を解決することを目的と
して考えられたものであって、ケーソンの下部内側に、
所要数のエアー噴射孔を一定間隔ごとに円周方向に配設
してエアー噴射部を設（プ、そのエアー噴射部の上方に
て、ケーソン下部内を中央部に掘削用のシャフトを有す
る底板により水密に区画するとともに、ケーソン下部内
と連通するエアーリフト管を設け、そのケーソンを水底
に接地させて地盤中に掘削沈下させる際に、ケーソン下
部内の地盤を周囲を噴射エアーにより掘削し、その掘削
土砂をエアーリフト管から排出してケーソンの沈下を促
進することによって上記問題点を解決してなる。This invention was devised for the purpose of solving the problems of the above-mentioned conventional method.
An air injection part is constructed by arranging the required number of air injection holes at regular intervals in the circumferential direction. In addition to dividing the area watertightly, an air lift pipe communicating with the lower part of the caisson is provided, and when the caisson is grounded on the water bottom and excavated into the ground, the surrounding area of the ground inside the lower part of the caisson is excavated with air injection, The above problem is solved by discharging the excavated earth and sand from the air lift pipe to promote the sinking of the caisson.
（作 用〕
上記工法においては、エアー噴射により地盤の掘削は周
囲から生じ、またエアー噴射量はいずれの部分において
も一定であることから地盤周囲の掘削にも大差がなく、
ケーソンの沈下は全体的に均等に行われる。また沈下量
はエアー噴射量及びエアーリフト管からの排出量、シャ
フト内の水面高を変えることによって制御される。(Function) In the above construction method, the excavation of the ground occurs from the surrounding area by air injection, and since the amount of air injection is constant in any part, there is no big difference in the excavation around the ground.
The caisson sinks evenly throughout. Further, the amount of sinking is controlled by changing the amount of air injection, the amount of air discharged from the air lift tube, and the height of the water surface inside the shaft.
（実施例〕
図中１はケーソンで、壁部内に複数のエアーパイプ２が
配設しである。このエアーパイプ２の下端は、ケーソン
１の下部内側に一定間隔ごとに設けられた円周方向の多
数のエアー噴射孔３．３に、エアーを供給する環状パイ
プ４と接続している。(Example) In the figure, 1 is a caisson, in which a plurality of air pipes 2 are arranged inside the wall. A large number of air injection holes 3.3 are connected to an annular pipe 4 for supplying air.
５は過沈下防止板を兼ねる底板で、上記多数のエアー噴
射孔３．３が存するエアー噴射部の上方のケーソン内に
ストッパー６をもって取付けられ、ケーソン下部内を水
密に区画している。Reference numeral 5 denotes a bottom plate which also serves as an over-settling prevention plate, which is mounted with a stopper 6 in the caisson above the air injection part where the large number of air injection holes 3.3 are present, and partitions the lower part of the caisson in a watertight manner.
この底板５の中央部には、掘削バケット７（第３図参照
）を昇降かつ開閉自在に収容し得る所要高さのシャフト
８が設けてあり、またそのシャフト８に隣接して開閉バ
ルブ９を備えたエアーリフト管１０が、ケーソン下部内
と連通させて設けである。A shaft 8 of a required height is provided in the center of the bottom plate 5 to accommodate an excavation bucket 7 (see FIG. 3) in a manner that allows it to be raised and lowered and opened and closed. An air lift pipe 10 is provided in communication with the lower part of the caisson.
上記シャフト８の下部には排水管１１が接続してあり、
また上部には給水管１２が接続しである。A drain pipe 11 is connected to the lower part of the shaft 8,
Further, a water supply pipe 12 is connected to the upper part.
なお１３は底板５の下面に取付けた水圧泪、１４はシャ
フト８の蓋板、１５は水底の地盤である。Note that 13 is a water pressure pipe attached to the lower surface of the bottom plate 5, 14 is a cover plate of the shaft 8, and 15 is the ground at the bottom of the water.
上記ケーソン１の沈下作業は、まず水底に垂直に降して
接地φたのち、水圧計１３により水面を検知し、シャフ
ト８の水面を設定範囲内で制御して水中におけるケーソ
ン１の安定化を図る。この水面制御はシャフト８に給水
または排水して行ゎれる。In order to lower the caisson 1, the caisson 1 is first lowered vertically to the bottom of the water, touches down φ, then the water pressure gauge 13 detects the water surface, and the water surface of the shaft 8 is controlled within a set range to stabilize the caisson 1 underwater. Plan. This water level control is performed by supplying or draining water to the shaft 8.
ケーソン１の下部内の地盤１５の掘削は、エアーの噴射
力とシャフト８内の掘削バケット７の両方をもって行う
が、地盤１５が軟弱な場合には掘削バケット７を省略す
ることができる。Excavation of the ground 15 in the lower part of the caisson 1 is performed using both the air injection force and the excavation bucket 7 in the shaft 8, but if the ground 15 is soft, the excavation bucket 7 can be omitted.
ケーソン下端が地盤１５に接地した状態において、エア
ーをケーソン内側に噴射すると、その噴射力によりケー
ソンと接する地盤周囲が一斉に掘削され、また掘削土砂
は水中に舞上げられる。エアーの噴射によりケーソン下
部内の水圧は上昇するが、エアーリフト管１０のバルブ
９の開放によってその圧力が放出され、エアー及び水と
共に掘削土砂がエアーリフト管１０より排出される。When air is injected inside the caisson with the lower end of the caisson in contact with the ground 15, the area around the ground in contact with the caisson is excavated all at once due to the injection force, and the excavated earth and sand are thrown up into the water. The water pressure in the lower part of the caisson increases due to the injection of air, but this pressure is released by opening the valve 9 of the air lift pipe 10, and excavated earth and sand are discharged from the air lift pipe 10 together with the air and water.
この排出によりケーソン下部内の抵抗が減少すると、ケ
ーソン１の下部内側地盤が除去されていることから、ケ
ーソン１は沈下して掘削されていない地Ｗ１５がシャフ
ト８の開口まで盛上げられるようになる。When the resistance in the lower part of the caisson decreases due to this discharge, the caisson 1 sinks and the unexcavated ground W15 is raised up to the opening of the shaft 8 because the ground inside the lower part of the caisson 1 has been removed.
そこでシャフト８内に掘削バケット７を入れ、盛上った
地盤１５の掘削を行う。Therefore, the excavation bucket 7 is inserted into the shaft 8, and the raised ground 15 is excavated.
このような噴射エアーと掘削バケット７による掘削とを
繰返し行ってケーソン１を徐々に地盤中に沈下させて行
く。また過当なケーソン１の沈下は、地盤１５が底板５
に接することによって防止され、沈下量はエアーリフト
管１０のバルブ９の開閉と、エアー噴射量、シャフト内
の水面高さを変えることにより任意に制御することがで
きる。The caisson 1 is gradually lowered into the ground by repeatedly performing such injection of air and excavation by the excavation bucket 7. In addition, the excessive settling of caisson 1 is due to the fact that the ground 15 is lower than the bottom plate 5.
The amount of subsidence can be controlled arbitrarily by opening and closing the valve 9 of the air lift pipe 10, changing the amount of air injection, and the height of the water surface inside the shaft.
この発明は上述のように、ケーソン下部内側よりエアー
を噴射して、ケーソンの沈下を促進してなることから、
機械により掘削するだけの場合よりも大幅な施工能率の
向上を期待することができ、工期の短縮、労務、機械等
の節減を図ることができる。またエアーによる掘削は均
等であるからケーソンの沈設精度が一段と向上し、大掛
りな機械による掘削が不要となるほか、シャフト内にて
掘削が行えるので、掘削トラブルの発生が減少するなど
の特長を有する。As mentioned above, this invention injects air from inside the lower part of the caisson to promote the sinking of the caisson.
It is possible to expect a significant improvement in construction efficiency compared to the case where only mechanical excavation is performed, and it is possible to shorten the construction period and save on labor, machinery, etc. In addition, since air excavation is even, the precision of caisson sinking is further improved, eliminating the need for large-scale excavation using machinery, and because excavation can be done inside the shaft, the occurrence of excavation troubles is reduced. have
図面はこの発明に係るケーソン沈下促進工法の実施例を
示すもので、第１図はケーソン縦断面図、第２図はケー
ソン下部の横縦平面図、第３図及び第４図は沈下状態を
示すケーソンの縦断面図である。The drawings show an embodiment of the method for promoting caisson settlement according to the present invention, in which Fig. 1 is a longitudinal cross-sectional view of the caisson, Fig. 2 is a horizontal and vertical plan view of the lower part of the caisson, and Figs. 3 and 4 show the subsidence state. FIG.
Claims (2)
一定間隔ごとに円周方向に配設してエアー噴射部を設け
、そのエアー噴射部の上方にて、ケーソン下部内を中央
部に掘削用のシャフトを有する底板により水密に区画す
るとともに、ケーソン下部内と連通するエアーリフト管
を設け、そのケーソンを水底に接地させて地盤中に掘削
沈下させる際に、ケーソン下部内の地盤の周囲を噴射エ
アーにより掘削し、その掘削土砂をエアーリフト管から
排出してケーソンの沈下を促進することを特徴とするケ
ーソン沈下促進工法。(1) An air injection part is provided by arranging the required number of air injection holes at regular intervals in the circumferential direction inside the lower part of the caisson, and above the air injection part, the inside of the lower part of the caisson is placed in the center. It is divided watertightly by a bottom plate with a shaft for excavation, and an air lift pipe that communicates with the inside of the lower part of the caisson is installed. A caisson settlement promotion method characterized by excavating the caisson using air jets and discharging the excavated earth and sand from an air lift pipe to promote the caisson settlement.
削バケットにより行う特許請求の範囲第１項記載のケー
ソン沈下促進工法。(2) The caisson settlement promotion method according to claim 1, wherein the excavation settlement is carried out by an excavation bucket provided in the shaft so as to be able to rise and fall freely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3704687A JPS63206527A (en) | 1987-02-20 | 1987-02-20 | Settling promoting work for caisson |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3704687A JPS63206527A (en) | 1987-02-20 | 1987-02-20 | Settling promoting work for caisson |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63206527A true JPS63206527A (en) | 1988-08-25 |
| JPH0453213B2 JPH0453213B2 (en) | 1992-08-26 |
Family
ID=12486649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3704687A Granted JPS63206527A (en) | 1987-02-20 | 1987-02-20 | Settling promoting work for caisson |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63206527A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1009671C2 (en) * | 1997-07-17 | 1999-01-19 | Voorbij Groep Bv | Tank-installation method in ground |
| CN105113530A (en) * | 2015-08-12 | 2015-12-02 | 上海市基础工程集团有限公司 | Caisson aid-sinking process adopting high-pressure injection |
| JP2018178471A (en) * | 2017-04-10 | 2018-11-15 | 清水建設株式会社 | Caisson and method for settling caisson |
-
1987
- 1987-02-20 JP JP3704687A patent/JPS63206527A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1009671C2 (en) * | 1997-07-17 | 1999-01-19 | Voorbij Groep Bv | Tank-installation method in ground |
| CN105113530A (en) * | 2015-08-12 | 2015-12-02 | 上海市基础工程集团有限公司 | Caisson aid-sinking process adopting high-pressure injection |
| JP2018178471A (en) * | 2017-04-10 | 2018-11-15 | 清水建設株式会社 | Caisson and method for settling caisson |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0453213B2 (en) | 1992-08-26 |
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