JP2867724B2 - Pollution diffusion inhibitor and method for preventing pollution diffusion in underwater embankment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-pollution agent and an anti-pollution diffusion method in an underwater embankment method in which earth and sand as an embankment material are poured into water to embankment.

[0002]

2. Description of the Related Art In an underwater embankment method in which earth and sand such as mountain sand, excavated earth and dredged earth are poured into water as an embankment material and embankment is performed, fine-grained soil such as clay and silt contained in the injected earth and sand is turbid. And disperse in the water, and the pollution spreads. In order to improve such a point, a method has been proposed in which a water-soluble polymer coagulant such as a hydrolyzate of polyacrylamide is mixed with earth and sand and poured into water to prevent the spread of pollution. However, in such a method, the effect of preventing pollution diffusion is not perfect, and the underwater embankment itself is weak and cannot be used as ground early.

[0003] For this reason, attempts have been made to mix hydraulic hardening agents such as cement and fly ash. However, simply mixing these hydraulic hardening agents cannot prevent the diffusion of pollutants and has low strength. Further, even when a conventionally used polymer flocculant such as a hydrolyzate of polyacrylamide is used in combination with a hydraulic hardening agent, the effect of preventing the diffusion of pollution is not perfect and the strength of the embankment is small. In addition, although a method of mixing a cellulose ether such as methylcellulose with the embankment material has been attempted, the effect of preventing the diffusion of pollution is small.

On the other hand, as an admixture for underwater concrete,
One containing an acrylamidoalkylsulfonic acid-based water-soluble polymer and cellulose ethers has been proposed (JP-A-60-260453). However, concrete is composed of a mixture of sand, gravel, cement and water, and is different from embankment material composed of earth and sand containing turbid components such as clay and silt. could not.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an underwater embankment having a large effect of preventing the diffusion of pollutants and having a high strength when earth and sand as an embankment material are put into water and embanked. It is an object of the present invention to provide a pollutant diffusion preventing agent in a submerged embankment method. Another object of the present invention is to provide a method in which earth and sand as an embankment material are put into water and embankment is used. It is to propose a diffusion prevention method.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a pollutant diffusion preventing agent and a method for preventing pollutant diffusion in the following underwater embankment method. (1) (A) Cellulose ethers and (B) a homopolymer or copolymer of a monomer represented by the following general formula (1), or another monomer copolymerizable with these monomers: And a water-soluble polymer having an intrinsic viscosity of 2 dl / g or more at 30 ° C. in a 1N aqueous solution of sodium chloride. General formula

Embedded image (Where R ¹ is H or a lower alkyl group, R ² is a linear or branched alkylene group having 1 to 4 carbon atoms, and X is H, an alkali metal, NH ₄ or an organic cation group.) (2) An underwater embankment method in which earth and sand as an embankment material are poured into water to embankment, wherein (A) cellulose ethers;
(B) a homopolymer or copolymer of a monomer represented by the following general formula (1), or a copolymer of another monomer copolymerizable with these monomers, and 2dl / g intrinsic viscosity at 30 ° C in 1N aqueous sodium chloride solution
A method for preventing pollution diffusion in an underwater embankment method, comprising adding a mixture obtained by adding the above water-soluble polymer to an embankment material and mixing the resulting mixture into water to prevent the diffusion of pollution. General formula

Embedded image (Where R ¹ is H or a lower alkyl group, R ² is a linear or branched alkylene group having 1 to 4 carbon atoms, and X is H, an alkali metal, NH ₄ or an organic cation group.)

[0007] In the present invention, the earth and sand as the embankment material is:
It contains fine-grained soil that becomes a polluting component such as clay and silt in addition to sand, and includes earth and sand such as mountain sand, excavated earth and dredged earth.

[0008] When the earth and sand are poured into water to be embanked, there are a method of directly charging the earth and sand and a method of mixing and adding a hydraulic hardening agent such as cement and fly ash to the earth and sand. There are a dry method in which water is added in a water state and a slurry method in which water is added in a water state, and the present invention can be applied to any of these cases.

The cellulose ethers (A) used in the present invention include water-soluble cellulose ethers such as methylcellulose, methylhydroxyethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose and hydroxypropylcellulose.

The water-soluble polymer (B) used in the present invention may be a homopolymer or a copolymer of the monomer represented by the above general formula (1), or a polymer which can be copolymerized with these monomers. And a limiting viscosity at 30 ° C. in a 1N aqueous solution of sodium chloride of 2 dl.
/ G, preferably 10 to 25 dl / g.

Specific examples of the compound represented by the general formula (1) include 2-acrylamido-2-methylpropanesulfonic acid, 2-acrylamidoethanesulfonic acid, 3-methacrylamidopropanesulfonic acid and salts thereof. And so on. Among them, 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof is preferable.

Other monomers copolymerizable with the compound represented by the general formula (1) include (meth) acrylamide, (meth) acrylic acid, (meth) acrylate, acrylonitrile, and vinyl acetate. can give.
Of these, acrylamide is preferred. The proportion of such another monomer contained in the water-soluble polymer (B) is 99 mol% or less, preferably 95 mol% or less, as long as the copolymer does not impair the water solubility.

From such a monomer, a water-soluble polymer (B)
In order to produce a compound represented by the general formula (1), one or more monomers of the compound represented by the general formula (1), and another monomer copolymerizable with these monomers are combined with a radical initiator What is necessary is just to polymerize or copolymerize in presence.

A preferable example of the water-soluble polymer (B) is a copolymer of sodium 2-acrylamido-2-methylpropanesulfonate and acrylamide (molar ratio: 1).
0:90 to 30:70).

[0015] In the present invention, in addition to the soil diffusion inhibitor comprising the cellulose ethers (A) and the water-soluble polymer (B) as additives to be added to earth and sand, other additives such as cement, fly ash, etc. Hydraulic setting agent,
Water, a fluidizing agent and the like can be added as required.
When the mixture is poured into water in a hydrolyzed state,
It is used to improve the fluidity of the mixture to be charged, and is a salt of a condensate of naphthalenesulfonic acid / formaldehyde, a salt of a condensate of alkylallylsulfonic acid / formaldehyde, a salt of a condensate of naphthalenesulfonic acid / modified lignin, melamine sulfone Examples thereof include acid / formaldehyde condensate salts, styrene / maleic acid copolymer salts and sulfated salts thereof, and amylene / maleic acid copolymer salts.

In the method for preventing pollution diffusion according to the present invention, a mixture obtained by adding the above-mentioned cellulose ethers (A) and the water-soluble polymer (B) to earth and sand is poured into water, and embankment is carried out in water. Prevent diffusion.

The mixing method for mixing the soil and sand with the cellulose ethers (A), the water-soluble polymer (B) and other additives to be added if necessary is not particularly limited. A known method such as a method of mixing with a stirrer or a method of mixing during transfer by a conveyor or the like can be adopted.

The method of charging the mixture into water is not particularly limited. In either case of the dry method or the slurry method, in addition to charging by means of a conveyor or the like, a pipe for embankment or the like is disposed in water and charged through this pipe or the like. A known method such as a method can be adopted.

The added amount of the cellulose ethers (A) is
In the case of the dry method, 1 kg or more, preferably 2 to 5 kg per 1 m ³ of non-hydrous soil, and in the case of the slurry method, ³ kg or more, preferably 4 to 10 k per 1 m ^{3 of} water in the wet state
g is appropriate.

The amount of the water-soluble polymer (B) to be added is 0.1 kg or more per 1 m ³ of non-hydrolyzed soil and 1 to 10 with respect to the cellulose ether (A) in the case of the dry method.
0% by weight, preferably 0.2-0.5 kg, and
30% by weight, 1m ^{3 of} water and soil in slurry mode
Per kg or more, and 1 to 100% by weight, preferably 0.1 to 100% by weight, based on the cellulose ethers (A).
2 kg and 2 to 50% by weight are suitable.

[0021]

Next, an embodiment of the present invention will be described.

Example 1, Comparative Example 1 1) Embankment material The following embankment materials were used. Mountain sand: Chiba mountain sand Mud content (FC); 2.9% Equivalent coefficient (Uc); 2.435 50% diameter (D ₅₀ ); 0.325 mm Specific gravity (GS); 2.72 Water content (W); 6.58% Cement: Blast furnace cement Class B Specific gravity; 3.05 Cellulose ethers (A): Cellulose ether-based separation inhibitor Particle size characteristics; White fine powder Composition; MHEC (methyl hydroxyethyl cellulose) Viscosity; 2% viscosity 35,000 cP (20 A) Water-soluble polymer (B), hereinafter referred to as A1: Acrylic-based separation inhibitor Particle size characteristics; White fine powder Copolymer of acrylamide and sodium 2-acrylamido-2-methylpropanesulfonate in a molar ratio of 80:20, intrinsic viscosity Below 15.3 dl / g, referred to as B1

2) Preparation of Kneading Soil for Dry Method A predetermined amount of A1 and B1 was premixed with 100 parts by weight of cement and mixed well. This was mixed with 1599 parts by weight (dry weight) of mountain sand (weight ratio of mountain sand / cement = 15.
99), and kneaded for 1 minute with a kneading capacity of 2 liters using a mortar mixer (low-speed stirring) to obtain a kneading soil for a dry method. In addition, per 1 m ³ of the mixture of cement and mountain sand,
A1 was mixed to be 0 to 5 kg, and B1 was mixed to be 0 to 2 kg.

3) Non-separation test in water (turbidity test) A 1-liter glass beaker was filled with up to 800 ml of artificial seawater, and 500 g of the above 2) which was accurately measured.
Was divided into 10 equal parts and gently dropped from the water surface. After that, it was left still for 3 minutes, and 600 ml of water in the beaker was gently collected using a dropper so as not to mix the sedimentation soil (filled soil). JIS K-0102 (photoelectric colorimetric method)
The amount of suspended solids (SS) was measured according to Table 1 shows the results.

4) Packing Density and Uniaxial Compressive Strength Test A simple mold for a test piece (inner diameter 5 cm × height 1)
0 cm; a peeling film was adhered to the inner wall surface), and artificial seawater was poured into the entire water tank up to 5 cm above the upper end of the mold.

The kneading soil of the above 2) was filled in a mold in a water tank as follows. That is, inner diameter 2.5c
The bottom plate, which can be opened and closed, was attached to a cylinder having a height of 45 cm and a height of 45 cm. A kneading soil was placed in this cylinder, and inserted into the bottom of the mold in the water tank. Next, the cylinder was gradually pulled up, the bottom plate was opened, and the kneading soil was filled in the mold.

The specimen filled in water was taken out of the water tank, the upper part was leveled horizontally with a trowel, and the internal weight was measured to determine the unit volume weight. After that, the test specimens were cured in water, and after 28 days, the uniaxial compressive strength was measured. Table 1 shows the results.

[0028]

[Table 1]

5) Evaluation From the results shown in Table 1, in the case of adding Al alone, the addition amount was 4 to 5
Although the turbidity is 11 to 12 degrees and does not become 10 or less even when kg / m ³ is used (Test Nos. 1 to 6), when A1 and B1 are used in combination, A1 and 0 of ^{3 to 4} kg / m3 are particularly useful. .2
When used together with 0.3 kg / m ³ of B1, the turbidity is 10
The results are shown below (Test Nos. 12, 13, and 16), and it can be seen that an excellent effect of preventing the diffusion of pollution is exhibited. A1 and B
It can be seen that the use of 1 together can reduce the amount of the antisegregation agent required to obtain a turbidity of a certain level or less.

It is also found that when A1 and B1 are used together, the density can be increased to 1.8 g / cm ³ or more.

Further, when B1 is used alone, the uniaxial compressive strength is greatly reduced, but when A1 and B1 are used in combination, the decrease in uniaxial compressive strength is small.

Example 2 and Comparative Example 2 1) Embankment material The following embankment materials were used. In addition, the same thing as Example 1 was used for pile sand, cement, A1 and B1. Dry powder clay: Kasaoka clay [Toyo Bentonite Industry Co., Ltd.
Manufactured] Fluidizer: Melamine-based fluidizer (melamine sulfonic acid /
Formaldehyde condensate salt) Solid content: 35% Body viscosity: 60 cP (20 ° C.) or less, referred to as C1

2) Preparation of Kneading Soil for Slurry Method 80 parts by weight of cement, 1300 parts by weight of mountain sand (dry weight), 100 parts by weight of dry powdered clay, and a predetermined amount of an antisegregation agent were kneaded with a mortar mixer (low-speed stirring). The mixture is kneaded with 2 liters for 30 seconds, and then water 5 in which a predetermined amount of C1 is dissolved.
After adding 00 parts by weight and kneading for 1 minute, a kneading soil for a slurry system was obtained. The weight ratio of mountain sand / cement of this kneading soil is 17.5, and the weight ratio of water / cement is 6.25. Note C1 is cement, pit sand, dry powder clay and mixtures 1 m ³ per 0~9.6kg water per separation inhibitor the mixture 1 m ^3, A1 is 0～6Kg, B1 is 0
The mixture was mixed to 0.5 kg.

3) Fluidity test (table flow test) In accordance with a mortar flow test using a flow table, a flow cone and a ram prescribed in JIS R5201 “Physical test method of cement”, the flow cone is subjected to the above-mentioned method. ) Was packed, the flow cone was removed, and the diameter of the spread of the soil on the flow table after 15 times / 15 seconds of impact at a height of 1 cm was measured at two orthogonal points. The average was determined. Table 2 shows the results.

4) In-separation test in water (turbidity test) In the same manner as in Example 1, except that the kneading soil for the slurry method of 2) was used instead of the kneading soil for the dry method. went. Table 2 shows the results.

5) Fillability test The soil (filled soil) charged in the water inseparability test of the above 3) was allowed to stand, and the state in water 10 minutes after charging was observed.
The following categories were evaluated. Table 2 shows the results. Evaluation classification ：: Spreading is good and almost flat. Δ: Spread is slightly insufficient, but almost flat. X: The spread is poor and the surface is not flat.

[0037]

[Table 2]

6) Evaluation From the results shown in Table 2, when A1 was used alone, the added amount was 6 kg.
/ Is m ³ To be turbidity is 12 degrees (Test No. 2
0), it can be seen that the turbidity can be further reduced by using A1 and B1 together (for example, Test No. 21). Also, it can be seen that the amount of the antisegregation agent required to obtain the same level of turbidity can be reduced (for example, Test Nos. 25 and 30).

When A1 and B1 are used in combination, the flowability and the filling property tend to decrease as the amount of B1 increases (Test Nos. 28 to 31). It can be seen that the filling property is improved (test numbers 32 to 34).

Example 3, Comparative Example 3 1) Preparation of Kneading Soil for Slurry Method
A kneading soil for a slurry method having a weight ratio of mountain sand / cement of 18.75 and a weight ratio of water / cement of 6.25 instead of 00 parts by weight (dry weight) was obtained. Note C1 is cement, pit sand, mixture 1 m ³ per dry powder clay and water 0-2.
4 kg, antisegregation agent, A1 is 0 per m ^{3 of the} mixture.
６6 kg, and B1 was mixed so as to be 0-5 kg.

2) Test Using the kneading soil for the slurry method of the above 1), a fluidity test, a water inseparability test and a filling test were carried out in the same manner as in Example 2. Table 3 shows the results.

[0042]

[Table 3]

3) Evaluation From the results shown in Table 3, similar to Examples 1 and 2, by using A1 and B1 in combination as compared with the case of using A1 alone, turbidity can be reduced and separation can be achieved. It can be seen that the amount of the inhibitor used can be reduced (for example, Test Nos. 41 to 46).

[0044]

As described above, according to the present invention, since the cellulose ethers (A) and the water-soluble polymer (B) are mixed, water having a high effect of preventing the diffusion of pollutants and having high strength is obtained. A pollutant diffusion inhibitor capable of forming an embankment is obtained. According to the present invention, a mixture obtained by adding a cellulose ether (A) and a water-soluble polymer (B) to an embankment material and mixing the resulting mixture is poured into water to perform underwater embankment and to prevent pollution diffusion. Therefore, it is possible to form an underwater embankment having an excellent effect of preventing the spread of pollution and having high strength.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI E02D 15/10 E02D 15/10 (72) Inventor Kazumasa Yamamoto 3-4-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo Kurita Kogyo Co., Ltd. (72 ) Inventor Shigeru Iijima 3-91, Daigo Katsuguchi-cho, Fushimi-ku, Kyoto-shi, Kyoto (58) Field surveyed (Int.Cl. ⁶ , DB name) C09K 3/00 110 C09K 3/00 103 C02F 11/00 E02D 15/10

Claims (2)

(57) [Claims] 1. A homopolymer or a copolymer of (A) a cellulose ether and (B) a monomer represented by the following general formula (1), or another copolymerizable with these monomers. It is a copolymer with a monomer and has an intrinsic viscosity of 2 dl / g at 30 ° C. in a 1N aqueous solution of sodium chloride.
A pollutant diffusion inhibitor in an underwater embankment method, comprising the water-soluble polymer described above. General formula (Where R ¹ is H or a lower alkyl group, R ² is a linear or branched alkylene group having 1 to 4 carbon atoms, and X is H, an alkali metal, NH ₄ or an organic cation group.) 2. An underwater embankment method in which earth and sand as an embankment material is poured into water to embankment, wherein (A) a cellulose ether and (B) a homopolymer of a monomer represented by the following general formula (1): Or a copolymer of these monomers with other monomers copolymerizable with these monomers, and having an intrinsic viscosity of 2 dl / g at 30 ° C. in a 1N aqueous sodium chloride solution.
A method for preventing pollution diffusion in an underwater embankment method, comprising adding a mixture obtained by adding the above water-soluble polymer to an embankment material and mixing the resulting mixture into water to prevent the diffusion of pollution. General formula (Where R ¹ is H or a lower alkyl group, R ² is a linear or branched alkylene group having 1 to 4 carbon atoms, and X is H, an alkali metal, NH ₄ or an organic cation group.)