JPH0566446B2 - - Google Patents
Info
- Publication number
- JPH0566446B2 JPH0566446B2 JP5255088A JP5255088A JPH0566446B2 JP H0566446 B2 JPH0566446 B2 JP H0566446B2 JP 5255088 A JP5255088 A JP 5255088A JP 5255088 A JP5255088 A JP 5255088A JP H0566446 B2 JPH0566446 B2 JP H0566446B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- temperature
- liquid
- low
- water
- 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
- 239000007788 liquid Substances 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 239000006260 foam Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
（産業上の利用分野）
本発明は各種の土木建築現場において、透水性
の高い地盤の掘削時に、地盤内への地下水の流入
を減少させて掘削を容易にするために、地盤中に
気泡を注入、発生させる方法に係るものである。
（従来の技術）
従来、透水性地盤における所要個所に、予め発
泡させた泡状の物質を、直接層状または面状に多
量に注入して、土粒子間の間隙部に気泡を介在せ
しめることによつて、地盤の透水性を著しく低下
させて透水地盤の遮水、止水を図る方法がある。
（発明が解決しようとする課題）
前記従来の方法には、次のような問題点があつ
た。
発泡させた泡状の物質を直接地中に注入して
も、注入口付近で目詰りが生じ、気泡が土粒子
間の間隙部に均一に分散しない。
発泡させた気泡の保形のために薬剤を使用し
なければならず、高価で且つ地下水汚染の惧れ
がある。
本発明は前記従来技術の有する問題点に鑑み、
且つ気体の液体に対する溶解度が温度によつて変
化することに着目して提案されたものであつて、
その目的とする処は、地盤中に安全、確実、均一
に、而も低コストで気泡を分散できる方法を提供
する点にある。
（課題を解決するための手段）
前記の目的を達成するため、本発明に係る地盤
中に気泡を注入、発生する方法は、０℃近くまで
冷却した液体をエアレーシヨンし、同液体中に気
体を飽和、または過飽和状態まで溶解させた低温
気泡注入材を地盤中に注入するように構成されて
いる。
更に本発明は地盤中に析出された気泡の保形、
安定を図るため、前記低温気泡注入材に気泡形成
安定剤を混入するものである。
（作用）
本発明によれば０℃近くまで冷却した液体をエ
アレーシヨンし、同液体中に気体を飽和、または
過飽和状態まで溶解させて低温気泡注入材を作
り、同低温気泡注入材を地盤中に注入することに
よつて、低温で且つ気体の飽和液体を、地盤内の
土粒子間の間隙水と置換させると、同間隙水と置
換された低温液体は、周囲の土粒子や間隙水と熱
交換されて容易に温度上昇し、これに伴つて前記
低温液体中に溶解している気体が気泡となつて析
出し、地盤内に確実、均一に分散する。
この際、前記低温気泡注入材に気泡形成安定剤
を混入すると、地盤内に析出された気泡が有膜独
立気泡となり、安定した状態に保持される。
（実施例）
以下本発明を実施例について説明する。
０℃近くまで水を冷却しエアレーシヨンして同
液体中に気体を飽和、または過飽和状態で溶解さ
せた低温気泡注入材を作る。
なお液体は前記水、若しくは粘性を有するもの
を使用し、特に地下水の流速が速い地盤では粘性
を有する液体を使用する。
また気体は空気、二酸化炭素等、毒性を有しな
いものを使用する。
更に冷却温度は、地下水温度、必要空気量等に
よつて決定しする。
次いで前記低温気泡注入材を従来の地盤注入工
法と同様の方法によつて、地盤の所要個所に層
状、または面状に必要量注入すると、同注入材は
気体を飽和、あるいは過飽和状態まで溶解させた
低温の液体であるので、土粒子間の間隙水と容易
に置換される。
このように土粒子間の間隙水と置換された低温
の液体は、通常地下水の温度が16℃付近のところ
が多いので、周囲の土粒子や間隙水と熱交換され
て容易に温度上昇する。
而して気体の液体に対する溶解度は後記する第
１表より明らかなように、温度の上昇に伴つて小
さくなるので、前記のように低温気泡注入材の温
度上昇に伴つて、液体中に溶解している気体が気
泡となつて析出し、地中に確実、均一に分散し、
この結果透水性地盤の遮水、止水効果が著しく向
上する。
下記第１表は１気圧の気体が１cm3の水に溶解す
るときの容積を、０℃、１気圧のときの容積に換
算した値の表を示す。
(Industrial Application Field) The present invention is used at various civil engineering and construction sites to create air bubbles in the ground in order to reduce the inflow of groundwater into the ground and facilitate the excavation when excavating highly permeable ground. This relates to the method of injection and generation. (Prior art) Conventionally, a large amount of pre-foamed foam material is injected directly into a desired location in permeable ground in a layered or planar form to create air bubbles in the gaps between soil particles. Therefore, there is a method of significantly lowering the permeability of the ground to block or stop water from permeable ground. (Problems to be Solved by the Invention) The conventional method has the following problems. Even if foamed material is injected directly into the ground, clogging occurs near the injection port, and the air bubbles are not evenly dispersed in the gaps between soil particles. A chemical must be used to maintain the shape of the foamed bubbles, which is expensive and may cause groundwater contamination. In view of the problems of the prior art, the present invention includes:
It was proposed based on the fact that the solubility of gas in liquid changes depending on temperature,
The objective is to provide a method for dispersing air bubbles safely, reliably, uniformly, and at low cost into the ground. (Means for Solving the Problems) In order to achieve the above-mentioned object, the method of injecting and generating air bubbles into the ground according to the present invention involves aerating a liquid that has been cooled to near 0°C and injecting gas into the liquid. It is configured to inject low-temperature foam injection material dissolved to a saturated or supersaturated state into the ground. Furthermore, the present invention aims to maintain the shape of air bubbles deposited in the ground.
In order to stabilize the material, a foam-forming stabilizer is mixed into the low-temperature foam injection material. (Function) According to the present invention, a liquid cooled to nearly 0°C is aerated, gas is dissolved in the liquid to a saturated or supersaturated state to create a low-temperature foam injection material, and the low-temperature foam injection material is poured into the ground. By injecting a low-temperature, gaseous saturated liquid to replace the interstitial water between soil particles in the ground, the low-temperature liquid that replaced the interstitial water exchanges heat with the surrounding soil particles and interstitial water. As the temperature is easily increased by the exchange, the gas dissolved in the low-temperature liquid becomes bubbles and precipitates, and is reliably and uniformly dispersed in the ground. At this time, when a bubble formation stabilizer is mixed into the low-temperature bubble injection material, the bubbles deposited in the ground become closed cells with membranes and are maintained in a stable state. (Example) The present invention will be described below with reference to Examples. Water is cooled to near 0°C and aerated to create a low-temperature bubble injection material in which gas is dissolved in the liquid in a saturated or supersaturated state. Note that the liquid used is the above-mentioned water or a liquid having viscosity, and in particular, a liquid having viscosity is used in the ground where the flow rate of underground water is high. In addition, non-toxic gases such as air and carbon dioxide are used. Furthermore, the cooling temperature is determined based on the groundwater temperature, the required amount of air, etc. Next, when the required amount of the low-temperature foam injection material is injected into the required areas of the ground in a layered or planar form using a method similar to the conventional ground injection method, the injection material dissolves the gas to a saturated or supersaturated state. Since it is a low-temperature liquid, it easily replaces the pore water between soil particles. The temperature of the low-temperature liquid that replaces the interstitial water between soil particles in this way easily rises as it exchanges heat with the surrounding soil particles and interstitial water, since the temperature of groundwater is usually around 16°C. As is clear from Table 1 below, the solubility of gas in liquid decreases as the temperature rises. The gas in the air becomes bubbles and precipitates, and is reliably and evenly dispersed in the ground.
As a result, the water-blocking and water-stopping effects of permeable ground are significantly improved. Table 1 below shows the volume when a gas at 1 atm is dissolved in 1 cm 3 of water, which is converted into the volume at 0° C. and 1 atm.
【表】
なお前記低温気泡注入材に気泡形成安定剤を少
量混入することにより、地中で析出した気泡が独
立した有膜独立気泡となる。
（発明の効果）
本発明によれば前記したように、０℃近くまで
冷却した液体をエアレーシヨンし、同液中に気体
を飽和、または過飽和状態まで溶解させた低温気
泡注入材を作り、同注入材を地盤中に注入するこ
とによつて、同注入材をの液体中に溶解している
気体を気泡として析出させ、地中に確実に、且つ
均一に分散せしめることによつて、透水性地盤の
遮水、止水効果を著しく向上させることができ
る。
また前記低温気泡注入材は、液体として水を使
用することができるので、安価で且つ公害等を発
生する惧れがない。
請求項２の方法においては、前記低温気泡注入
材に気泡形成安定剤を混入することによつて、地
中に析出した気泡が安定した有膜独立気泡とな
り、地盤の遮水、止水効果を更に向上しうるもの
である。[Table] By mixing a small amount of a bubble formation stabilizer into the low-temperature bubble injection material, the bubbles precipitated underground become independent closed cells with membranes. (Effects of the Invention) According to the present invention, as described above, a low-temperature bubble injection material is produced by aerating a liquid cooled to near 0°C, and dissolving gas in the same liquid to a saturated or supersaturated state, and the same is injected. By injecting the material into the ground, the gas dissolved in the liquid of the injection material is precipitated as bubbles and dispersed reliably and uniformly into the ground, making the ground permeable. The water-blocking and water-stopping effects of water can be significantly improved. Furthermore, since the low-temperature bubble injection material can use water as the liquid, it is inexpensive and there is no risk of causing pollution. In the method of claim 2, by mixing a bubble formation stabilizer into the low-temperature bubble injection material, the bubbles precipitated in the ground become stable closed cells with a membrane, thereby improving the water-blocking and water-stopping effects of the ground. This can be further improved.
Claims (1)
し、同液体中に気体を飽和、または過飽和状態ま
で溶解させた低温気泡注入材を地盤中に注入する
ことを特徴とする地盤中に気泡を注入、発生させ
る方法。 ２ 前記低温気泡注入材に気泡形成安定剤を混入
することを特徴とする請求項１記載の地盤中に気
泡を注入、発生させる方法。[Claims] 1. A method in the ground characterized by aerating a liquid cooled to nearly 0°C and injecting into the ground a low-temperature bubble injection material in which gas is dissolved in the liquid to a saturated or supersaturated state. A method of injecting and generating air bubbles. 2. The method of injecting and generating air bubbles into the ground according to claim 1, characterized in that a bubble formation stabilizer is mixed into the low-temperature air injection material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255088A JPH01226925A (en) | 1988-03-08 | 1988-03-08 | How to inject and generate air bubbles in the ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5255088A JPH01226925A (en) | 1988-03-08 | 1988-03-08 | How to inject and generate air bubbles in the ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01226925A JPH01226925A (en) | 1989-09-11 |
| JPH0566446B2 true JPH0566446B2 (en) | 1993-09-21 |
Family
ID=12917909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5255088A Granted JPH01226925A (en) | 1988-03-08 | 1988-03-08 | How to inject and generate air bubbles in the ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01226925A (en) |
-
1988
- 1988-03-08 JP JP5255088A patent/JPH01226925A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01226925A (en) | 1989-09-11 |
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