JPH03100295A - Processing of gas foam-mixed excavation slag - Google Patents

Abstract

PURPOSE:To facilitate storage, transport and execution by developing the foam suppressing effect by forming the cationic organic high polymeric coagulant having a specific cation equivalent value into liquid form having a specific viscosity and adding and kneading said coagulant in a specific rate into a gas foam mixed excavation slag. CONSTITUTION:A cationic organic high polymeric coagulant having a cation equivalent value of 2meg/g or more is added in a rate of 0.01-1kg for 1m<3> into the gas foam mixed excavation slag and kneaded. In the addition kneading, the viscosity of the liquid containing cationic organic high polymeric coagulant of 10,000cp or less is desirable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for disposing of excavation debris containing air bubbles generated by the air bubble shield method or air drilling method in which excavation is performed while injecting air bubbles in civil engineering work.

(Conventional technology and problems) Conventionally, shield construction methods used bentonite mud, making it difficult to dispose of the remaining soil.

To solve this problem, a bubble shield method has been proposed in which air bubbles are mixed in instead of bentonite to ensure the fluidity and water-tightness of excavated soil. The general operating conditions for this foaming method are to add and knead foam with a foaming ratio of 3 to 30 times per foaming agent aqueous solution in an amount of 10 to 100% per volume of excavated soil. The slump value of mixed excavation debris is often about 3 to 10 cm. In addition to the bubble shield method, there is also known a method in which foam is injected into the hole for the purpose of cooling the bit part and ejecting drilling debris in poling and the like.

As a method for disposing of excavation debris generated from these air-bubbly construction methods, Japanese Patent Publication No. 58-47560 describes defoaming by leaving it to stand naturally, and Japanese Patent Publication No. 59-49999 describes defoaming treatment by adding a defoaming agent. Are listed.

However, aerated excavation slurry often contains silt/clay and cellulose-based thickeners, and the strong mud film produced by these ingredients not only obstructs the release of air bubbles, but also prevents the removal of air bubbles. Provides liquidity. For this reason, mere defoaming treatment is still not a sufficient countermeasure. On the other hand, the special request
3-259367, Japanese Patent Application No. 1-13205 and Japanese Patent Application No. 1
13206 describes a technology in which a polymer flocculant is added to the remaining soil of the shield construction method, which does not contain a foaming agent.

(Problems to be solved by the invention) An object of the present invention is to provide a simple processing method that can solidify excavated debris mixed with air bubbles in a short time to obtain soft soil that can be easily transported and used as fill soil. .

In addition, the present invention aims to provide chemicals and a chemical injection method that are easy to store, supply, mix, etc., even in construction sites with narrow urban areas, for reforming and solidifying excavated debris containing air bubbles. .

(Means for Solving the Problems) The present invention provides that the cation equivalent value is 2 me
It is constructed by adding and kneading a cationic organic polymer flocculant having a ratio of q/g or more.

The cationic organic polymer flocculant used in the present invention is a known one, and specifically, a reaction product in which amine or ammonia is condensed using shrimp herohydrin, alkylene civalide, alkylene polyepoxide, etc. as a linking agent ( Condensation reaction products of dicyandiamide, melamine, guanidine, etc. or polyethyleneimine, polydimethyldiallylammonium chloride using formaldehyde as a linking agent , a salt of dialkylaminoalkyl methacrylate or dialkylaminoalkylacrylamide, and/or a (co)polymer of a quaternized product thereof.

Since the cationic organic polymer flocculant used in the present invention has a main action mechanism of charge neutralization, it is desired that the cation equivalent value is high, things have good effects.

The cation equivalent value is usually determined by colloid titration at pH 4.0.

In carrying out the present invention, the crosslinking adsorption effect of the cationic organic polymer flocculant also contributes to the effect, so if the cation equivalent values are the same, a high molecular weight flocculant will be more effective with a smaller amount added. . The method of kneading the bubble-mixed I drilling slag and the cationic organic polymer flocculant is not particularly limited;
In addition to using kneading machines such as continuous mixers and forced stirring mixers, kneading can also be performed using civil engineering machinery such as power shovels, backhoes, and screw conveyors. In particular, the method of injecting into the screw conveyor section of a shielding machine uses existing equipment, so it does not require new processing sites and can be easily implemented in urban areas.

Drilling shear mixed with air bubbles and '1RP1! The amount of cationic organic polymer flocculant added per 1 m3 of air-filled excavation shear is
Use 0.01 to 1 kg of pure polymer. When the polymer flocculant is added in the form of a powder, it tends to produce powder and requires a high-performance stirring and kneading device. In order to easily mix with air-filled excavation shear, the polymer flocculant should be used at a viscosity of 10.0O.
It is desirable to add it in the form of a low viscosity liquid of less than Ocp.

The method of liquefaction is to dissolve it in water and to a concentration of 0.5 to 50.
The cheapest method is to add the coagulant as an aqueous solution of about 1.0%. However, when an increase in water content is to be avoided, such as when treating shear with a high water content, a polymer flocculant prepared by liquefying polymer mold particles by liquefying the molecules Pi in an oil or salt aqueous solution is desirable. In addition, the method of using the cationic organic polymer flocculant in the present invention is not limited to adding it alone, but also adding it in combination with an inorganic flocculant such as aluminum sulfate or polyaluminum chloride, or adding the cationic organic polymer flocculant. After mixing, a super absorbent resin, an anionic organic polymer flocculant, or an inorganic solidifying agent such as lime or cement may be added and kneaded.

(Function) The present invention is based on the fact that a cationic organic polymer flocculant is added to and kneaded into the aerated excavation slurry to neutralize the negative charges of clay particles, etc., cause them to coagulate, and remove their fluidity.

When the mud film around the bubbles is broken (by neutralizing the charge, losing hydrophilicity and coagulating), the bubbles are easily aggregated by kneading and released from the shear. After losing air bubbles and coagulating, it has no fluidity (and is easy to transport and bury).

This effect is effective even when anionic thickeners such as CMC are present in the mud, and cationic organic polymer flocculants form ionic complexes with these anionic polymers to make them water-insoluble. , the thickening effect disappears.

Such effects cannot be expected from conventional antifoaming agents and prove the superiority of the present invention.

(Example) The present invention will be specifically described below using Examples.

Synthesis example-1 IQ equipped with a stirrer, thermometer, reflux condenser, and nitrogen introduction tube
Into five rosetteable flasks, add 681 homopolymer of acryloyloxyethyltrimethylammonium chloride, 42 g of anhydrous sodium sulfate, 98 g of anhydrous aluminum sulfate, 253 g of ion-exchanged water, 33 g of acrylamide.
．． 5 g of acrylamide propyldimethylbenzyl ammonium chloride and 22.5 g of acrylamide propyldimethylbenzyl ammonium chloride were charged, heated to 50° C., and replaced with nitrogen.

to this. 2.2°-azobis(2-amidinopropane)
Add 1 mQ of 10% aqueous solution of hydrochloride, and stir at 50°C.
After 0 hours of polymerization, a dispersion of polymer mold particles was obtained.

This is called sample-1. The viscosity of this product is 20 at 25°C.
The viscosity of a solution dissolved in a 1N sodium sulfate aqueous solution with a polymer concentration of 0.5% is 10 cp at 25°C.
, and the Fit value for cation at pH 4.0 is 2
．． It was 6meq/g.

Synthesis Example-2 A separable flask similar to that used in Synthesis Example-1 was charged with 220 g of medium oil, and Hypermer B-24 manufactured by IC1 was added.
6 and sorbitan monooleate Log were dissolved.

Separately, a moramer solution was prepared by dissolving 102 g of acrylamide and 198 g of methacryloyloxyethyltrimethylammonium chloride in 213 g of ion-exchanged water, and then poured into the above-mentioned separable flask and stirred.

After purging with nitrogen for 30 minutes and adjusting the internal temperature to 45° C., an acetone solution containing 50 mg of abbisisobutyronitrile was added to initiate polymerization. After no heat generation was observed, the temperature was raised and maintained at 65° C. for 5 hours to complete polymerization. A liquid obtained by adding 20 g of polyoxyethylene nonylphenyl ether and 20 g of polyoxyethylene sorbitan triolate to the obtained emulsion is referred to as sample-2. The viscosity of sample-2 is 980 cp at 25°C, and the viscosity of a solution dissolved in 1N saline at a polymer concentration of 0.5% at 25°C is 25 cp, and the cation equivalent value at pH 4.0 is 3.1 meq. /g was hot.

Synthesis Example-3 370 g of epichlorohydrin was charged into an IQ four-separable flask equipped with a stirrer, a thermometer, a reflux condenser, and a 500 ml dropping funnel, and while stirring, the internal temperature was brought to 10-4.
40% dimethylamine aqueous solution while adjusting to 5℃
g was added dropwise. After completion of the dropwise addition over a period of 2 hours, 40gt of xamine was added to pentaethylene, and the internal temperature was maintained at 65 to 70°C to carry out a condensation reaction. The viscosity of the contents is 15゜000
A 25% aqueous sulfuric acid solution was added to the cp in a thickened state, the pH was adjusted to 3 to stop the condensation reaction, and the resulting polycation aqueous solution was diluted to a polymer concentration of 50%. Try this F4
Call it -3.

The viscosity of sample-3 at 25°C is 5300 cp,
The cation equivalent value of the polymer was 7.1 meq/g.

Synthesis Example 4 A 2% aqueous solution of a powdered polymer flocculant, which is a (co)polymer of commercially available methacryloyloxyethyltrimethylammonium chloride and acrylamide, was prepared and tested.

The name of each sample and physical property values are shown in the table below. However, 0.5% in the table
Viscosity is the viscosity at 25° C. of a solution dissolved in 1N saline at a polymer concentration of 0.5%.

Table-1 Example-1 20 kg of soil with a moisture content of 41% and a silt content of 80% was placed in a forced mixing concrete mixer, and mixed with a 0.3% aqueous solution of sodium polyoxyethylene alkyl sulfonate.
7Q of double foamed material was added and kneaded for 2 minutes.

The resulting aerated soil had a slump value of 5.5 am. Adding a cationic organic polymer flocculant to the aerated soil,
Table 2 shows the results of measuring the slump value after 2 minutes of R.

The amount of chemicals added is indicated as is.

Example-2 Carboxymethylcellulose, whose viscosity is 5000 cp as a 2% aqueous solution, was made into an aqueous solution with a polymer concentration of 0.5%, and 0.1% by weight of sodium polyoxyethylene alkyl sulfonate was added and dissolved in water using a stirrer. by 6.5
Fired twice as much. 18 kg of commercially available sand with a water content of 12% and FM3°11 and a water content of 5 were placed in a forced mixing concrete mixer.
2 kg of red clay with a silt clay content of 48% was charged, and the foamed product 6Q was added thereto and kneaded for 1 minute.

The resulting aerated soil had a slump value of 6 cm. A cationic polymer flocculant was added to the aerated soil, and after kneading for 2 minutes, the slump value was measured and the results are shown in Table 3.

The amount of chemicals added is indicated as is.

Table-2 Table-3

Claims (1)

[Claims] 1) A bubble characterized by adding and kneading a cationic organic polymer flocculant having a cation equivalent value of 2 meg/g or more in an amount of 0.01 to 1 kg per 1 m^3 of the bubble-containing excavation shear. How to deal with mixed excavation debris. 2) The cationic organic polymer flocculant has a viscosity of 10,000c.
2. The method for treating excavated debris containing air bubbles according to claim 1, characterized in that the additive is added and kneaded in a liquid state with a concentration of p or less.