JPH0453213B2 - - Google Patents
Info
- Publication number
- JPH0453213B2 JPH0453213B2 JP3704687A JP3704687A JPH0453213B2 JP H0453213 B2 JPH0453213 B2 JP H0453213B2 JP 3704687 A JP3704687 A JP 3704687A JP 3704687 A JP3704687 A JP 3704687A JP H0453213 B2 JPH0453213 B2 JP H0453213B2
- Authority
- JP
- Japan
- Prior art keywords
- caisson
- air
- excavation
- ground
- 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
Links
- 238000009412 basement excavation Methods 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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つている。
Generally, a caisson is lowered by mechanically excavating the ground inside the caisson.
したがつて、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
るなどの問題があつた。
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 were problems such as:
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つて、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ヤ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
ン下部内に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つて上記問題
点を解決してなる。
This invention was devised with the aim of solving the above-mentioned problems of the conventional method, and the required number of air injection holes are arranged at regular intervals in the circumferential direction inside the lower part of the caisson. A spray part is provided,
Above the air injection part, the inside of the lower part of the caisson is watertightly divided by a bottom plate with a shaft for excavation in the center, and an air lift pipe communicating with the inside of the lower part of the caisson is installed, and the caisson is grounded on the water bottom. The above-mentioned problem is solved by excavating the surrounding ground in the lower part of the caisson by blowing air and discharging the excavated earth and sand from the air lift pipe to promote the settling of the caisson. It becomes.
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、シヤフト内の水面
高を変えることによつて制御される。
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, and the caisson sinks evenly throughout. It will be done. Further, the amount of sinking is controlled by changing the amount of air injection, the amount of air discharged from the air lift pipe, and the height of the water surface inside the shaft.
図中１はケーソンで、壁部内に複数のエアーパ
イプ２が配設してある。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。
In the figure, 1 is a caisson, and a plurality of air pipes 2 are arranged inside the wall. The lower end of this air pipe 2 has a large number of air injection holes 3, 3 in the circumferential direction provided at regular intervals inside the lower part of the caisson 1.
It is connected to an annular pipe 4 that supplies 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ツパー６をもつて取付けら
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 many 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、掘削バケツト７（第
３図参照）を昇降かつ開閉自在に収容し得る所要
高さのシヤフト８が設けてあり、またそのシヤフ
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て
ある。 In the center of the bottom plate 5, there is provided a shaft 8 of a required height that can house 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.
上記シヤフト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が接続してあ
る。 A drain pipe 11 is connected to the lower part of the shaft 8, and 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計、１
４はシヤフト８の蓋板、１５は水底の地盤であ
る。 Note that 13 is a water pressure gauge attached to the bottom surface of the bottom plate 5;
4 is the 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
に降して接地したのち、水圧計１３により水面を
検知し、シヤフト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
水面制御はシヤフト８に給水または排水して行わ
れる。 In the work of lowering the caisson 1, the caisson 1 is first lowered vertically to the bottom of the water and touches the ground, 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. . This water level control is performed by supplying or discharging water to the shaft 8.
ケーソン１の下部内の地盤１５の掘削は、エア
ーの噴射力とシヤフト８内の掘削バケツト７の両
方をもつて行うが、地盤１５が軟弱な場合には掘
削バケツト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 jet 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を噴射すると、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
つ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 into the inside of 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 soil is 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
ない地盤１５がシヤフト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, since the ground inside the lower part of the caisson 1 has been removed, the caisson 1 sinks and the unexcavated ground 15 is raised up to the opening of the shaft 8.
そこでシヤフト８内に掘削バケツト７を入れ、
盛上つた地盤１５の掘削を行う。 Then, put the excavation bucket 7 into the shaft 8,
Excavation of the raised ivy ground 15 is carried out.
このような噴射エアーと掘削バケツト７による
掘削とを繰返し行つてケーソン１を徐々に地盤中
に沈下させて行く。また適当なケーソン１の沈下
は、地盤１５が底板５に接することによつて防止
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、シヤ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. Further, appropriate sinking of the caisson 1 is prevented by the ground 15 coming into contact with the bottom plate 5, and the amount of sinking can be controlled by changing the opening and closing of the valve 9 of the air lift pipe 10, the amount of air injection, and the height of the water surface inside the shaft. It can be controlled arbitrarily by
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、大掛り機
械による掘削が不要となるほか、シヤフト内にて
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, so it can be expected to significantly improve construction efficiency compared to the case where only mechanical excavation is performed. , 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 installation is further improved, eliminating the need for large-scale excavation, and since excavation can be done inside the shaft, the occurrence of excavation troubles is reduced. .
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。
１……ケーソン、２……エアーパイプ、３……
エアー噴射孔、５……低板、７……掘削バケツ
ト、８……シヤフト、９……バルブ、１０……エ
アーリフト管、１１……排水管、１２……給水
管、１３……水圧計、１５……地盤。
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. 1...Caisson, 2...Air pipe, 3...
Air injection hole, 5...Low plate, 7...Drilling bucket, 8...Shaft, 9...Valve, 10...Air lift pipe, 11...Drain pipe, 12...Water supply pipe, 13...Water pressure gauge , 15...ground.
Claims (1)
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ヤフトを有する
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。 ２ 上記掘削沈下はシヤフト内に昇降自在に設け
た掘削バケツ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。[Scope of Claims] 1. An air injection part is provided by arranging a 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, an air injection part is provided inside the lower part of the caisson. The caisson is watertightly divided by a bottom plate with a shaft for excavation in the center, and an air lift pipe communicating with the inside of the lower part of the caisson is installed. A caisson settlement promotion method characterized by excavating the ground around the ground using jet air and discharging the excavated earth and sand from an air lift pipe to promote the caisson settlement. 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 movable up and down.
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 JPS63206527A (en) | 1988-08-25 |
| JPH0453213B2 true 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) |
Families Citing this family (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63206527A (en) | 1988-08-25 |
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