JPS6255325A - Charging of soil into water - Google Patents

Abstract

PURPOSE:To form a scouring-proof covering soil by enhancing the leaching preventive effect by a method in which soil is mixed with a binder to combine soil particles and also to prevent the separation of soil particles and the soil mixture is charged into water. CONSTITUTION:Soil is mixed with a water-soluble high polymer, e.g., polyvinyl alcohol, etc., or a water-soluble semi-synthetic high polymer, e.g., viscose, etc., together with a hardening agent, e.g., cement-based material, etc., as needed. The soil so treated is charged into water by using bucket, etc., to form a covering soil, banking, or artificial islet on the bottom under water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for introducing soil into water when covering the water bottom with soil and constructing an artificial island using embankment.

(Prior art and its problems) In rivers, lakes, marshes, sea areas, etc., as one of the measures to prevent water quality deterioration due to organic components and harmful components leaching into the water from organic sludge deposited on the bottom of the water, There is a way to seal the sludge by covering the surface of the sludge with earth and sand. This method generally involves dumping earth and sand into the water using an open-bottom samurai transport ship or a special sand shovel.

However, the soil thrown out in this way separates into pieces in the water, with the coarse particles settling first, and the fine particles suspending in the water and settling later, so it does not form a homogeneous covering soil. , the sludge containment effect also decreases accordingly.

Furthermore, the soil thrown out in this way has no binding force between particles, so it tends to be washed away by water currents.

On the other hand, a common method for constructing artificial islands in rivers, lakes, ocean areas, etc. is to fill the area with soil and fill it with steel sheet piles, steel pipe sheet piles, concrete walls, etc. Similar to the above, the earth and sand particles separate into pieces in the water and settle. Therefore, when soil is introduced from near the water surface using a packet, etc., the coarse particles settle and accumulate first, while the fine particles settle slowly and become suspended in the water, and are deposited in the upper layer of the sediment. . In addition, when slurry-like sediment is introduced from the bottom of the water using a 1-Remy tube, the coarse particles of the sediment settle near the tremie tube outlet, while the fine particles of the sediment are suspended in the water, and the tremie tube Moves far away from the discharge port.

For this reason, the ground of an artificial island created by the conventional earth and sand injection method is heterogeneous, and moreover, the water content is high in areas containing a large amount of fine particles and is extremely soft. Therefore, when a large ground bearing capacity is required, the vertical compaction method and vertical drain method are recommended.

It was necessary to use the deep stirring mixing method (improved with cement and lime), making it difficult to quickly create and cover an artificial island with a large ground bearing capacity. Furthermore, there was also the problem of water pollution when soil was added.

(Object of the Invention) The object of the present invention is to solve the above-mentioned problems by making it difficult to separate the earth and sand thrown into the bottom of the water.

(Summary of the Invention) In order to achieve the above-mentioned object, the present invention uses soil and a binder that binds the soil particles and suppresses their separation when covering the water bottom with soil, embanking, or constructing an artificial island. It is characterized by being mixed and fed.

As the binder, a binder such as a water-soluble natural polymer, a water-soluble semi-synthetic polymer, or a water-soluble synthetic polymer can be used. As examples of binders, water-soluble natural polymers include various starches, konjac, funori, agar, sodium alginate, mallow, tragonth gum, gum arabic, dextrin, levan, glue, gelatin, and casein.

Use collagen etc.

An example of a water-soluble semi-synthetic polymer is viscose.

Methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose dialdehyde starch, etc. are used.

As the water-soluble synthetic polymer, polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyethylene oxide, etc. are used.

These binders are a kind of glue-like substance that prevents the separation of particles and the uptake of water.

The mixing ratio of the binder to the earth and sand is desirably 1 to 5 parts by weight per 1000 parts by weight of the earth and sand, taking into account economic efficiency and degree of achievement of effects.

In addition, if the strength of the soil itself is required after being added,
Add a curing agent as the third component.

As the hardening agent, cement-based materials, lime-based materials, slag-based materials, asphalt-based materials, etc., which have been conventionally used for soil stabilization treatment, are used.

Slaked lime or the like is used as the lime-based material.

As the slag-based material, blast furnace slag slag, converter slag, and pulverized products thereof are used.

As the asphalt material, water-soluble asphalt or the like is used.

These curing agents solidify and stabilize the soil quality of the earth and sand after being added, and improve its strength. The addition mixing ratio is 10:0
00! It is desirable to have 50 to 200 double copies per 1 copy of ff.

In addition, the method of mixing only earth and sand and hardening agent and putting it into water causes significant separation and generates a large amount of laitance at the joints, making it impossible to create a good ground or soil cover.

As for the method of introducing the earth and sand with the above-mentioned composition, various methods can be selected, such as a method using a packet or the like, or a pump method using a tremie pipe or the like. In particular, in the present invention, the fluidity of the earth and sand or the mixture of earth and sand, hardening agent, and water is increased by adding a binder, so the efficiency of pumping work is increased, and the self-leveling property after charging is also improved. .

(Effects of the Invention) As explained above, according to the method of the present invention, the input soil is bound by the binder and hardening agent, so it does not separate in the water and settles as one. Therefore, it is deposited in a very homogeneous state.

Furthermore, since less water is taken up in the water after aging, a dense state with little loss of density can be maintained.

When a hardening agent is further added, solidification progresses until a high strength is achieved early after addition.

Therefore, the method of the present invention has a high elution prevention effect in sludge containment work at the bottom of the water, and is very effective in creating cover soil that is difficult to wash away. Also, according to this method,
Because it is possible to create artificial ground with a large bearing capacity at an early stage,
This is extremely effective when constructing temporary artificial islands for construction work in water areas.

(Example) As shown in Table 1 below, the unconfined compressive strength of the mixture samples having the compositions (A) to (E) at the end of slump and after 28 days of application was compared.

The properties of the soil used in each formulation are shown in Table 2.

Table 1: Mixing test results Table 2 Properties of soil In the above results, samples (C) and (D).

Comparing (E), the solidification strength slightly decreases due to the addition of a binder, but the slump distance, which is important for pumping workability, is 19cn+ in (D), and (D) has very good fluidity. It turned out to be.

Next, 500 ml of each sample (A) to (E) was poured into a beer bottle containing 500 ml of seawater, and the properties after 24 hours were observed. As a result, the deposited state was as shown in the attached diagram.

The individual properties are as follows.

(A) Coarse particles are deposited in the lower layer, causing turbidity in the supernatant.

(B)...The particle size of the deposited portion is uniform and the supernatant is completed/V.

(C) Coarse particles were deposited in the lower layer, the leveling property of the cured product was poor, and a large amount of laitance was generated.

(D)...The particle size of the deposited portion is uniform, the leveling property of the cured product is good, and no laitance occurs.

(E)...The particle size of the deposited portion is uniform, but the leveling property of the cured product is somewhat poor. Also, no laitance occurred.

From this result, it was confirmed that the present invention can obtain the following effects.

(1) Comparison with samples (A> and (B)) shows that the binder has the effect of suppressing separation of earth and sand particles and preventing water pollution.

(2) Comparison of samples (C), <D), and (E) shows that in addition to the effect of (1), the binder has the effect of preventing laitance.

(3) The curing agent in sample (D) has the effect of improving self-leveling properties.

It goes without saying that even for materials and their formulations other than those in the Examples, the optimum combination of materials and their formulations can be obtained through measurements similar to those described above and experimental observations.

[Brief explanation of the drawing]

Figures (A) to (E) are state explanatory diagrams schematically showing experimental observation results of the present invention. Procedural formalities (method) December 12, 1985 Michibe Uga, Director General of the Patent Office1, Indication of the case, Patent Application No. 191877, filed in 19872, Name of the invention, Method for putting earth and sand into water, 3, Amendment. Relationship with the case involving the person who filed the patent application Patent applicant address: 3-37 Kyobashi, Higashi-ku, Osaka-shi, Osaka Name:
<054) Obayashi Co., Ltd. Founding Director Obayashi
Yoshibe 4, agent address: Nishishin I, Minato-ku, Tokyo! 1-24-16 No. 5, date of amendment order 6, subject of amendment (1) "Brief explanation of drawings" column of specification (2) Attached drawing 7 of specification, contents of amendment (1) Specification "Figures (A) to (E)" on page 11, line 18 of
)" should be corrected to "Fig. 1 (Δ) to (E)." (2) Replace the attached drawings of the details with the attached drawings. Spontaneous writing of procedural amendments) December 23, 1985 Michibe Uga, Commissioner of the Patent Office1, Indication of the case 1985 Patent Application No. 1918772, Name of the invention Method for introducing earth and sand into water 3, Person making the amendment Case Relationship with Patent Applicant Address 3-37 Kyobashi, Higashi-ku, Osaka-shi, Osaka Name Name
<054) Obayashi Co., Ltd. CEO M Obayashi
Yoshibe 4, Agent address: 4th floor, Okana Building 2, 1-24-16 Nishi-Shinbashi, Minato-ku, Tokyo Name (7128) Patent attorney - Kensuke Iro (5)
08-0336 (Main) 5. Subject of amendment (1) "Claims" column 6 of the specification. Contents of amendment The "Claims" column is amended as shown in the attached sheet. ,・z′:te′ j・・１・゛伜′、. '/+:j'- ~ Claims (1) When covering the water bottom with soil, embanking, or creating an artificial island, mixing earth and sand with a binder that binds the earth and sand particles and suppresses their separation. A method for introducing earth and sand into water. (2) The method for introducing earth and sand into water according to claim 1, wherein the binder is a binder that imparts caking properties between the earth and sand particles and ensures a predetermined fluidity. (3) The above-mentioned binder is comprised of a hardening agent pot which hardens between the above-mentioned caking agent and the above-mentioned sand particles and solidifies the above-mentioned sand and sand. How to put it in. (4) The method for introducing earth and sand into water according to claim 2, wherein the binder comprises a water-soluble natural polymer or a water-soluble synthetic polymer. 5) The hardening agent mentioned above is ordinary Portland cement. Claim 3, characterized in that the material is one selected from blast furnace cement, fly ash cement, other cement materials, lime-based materials such as slaked lime, or asphalt-based materials, or a combination thereof. Method of introducing soil into water.

Claims (5)

[Claims] (1) When covering the water bottom with soil, embanking, or constructing an artificial island, a method of producing earth and sand characterized by supplying a mixture of earth and sand and a binder that binds the earth and sand particles and suppresses their separation. How to put it into water. (2) The method for introducing earth and sand into water according to claim 1, wherein the binder is a binder that imparts caking properties between the earth and sand particles and ensures a predetermined fluidity. (3) The method for introducing earth and sand into water according to claim 2, wherein the binder is a hardening agent that hardens between the earth and sand particles and solidifies the earth and sand. (4) The method for introducing earth and sand into water according to claim 2, wherein the binder comprises a water-soluble natural polymer or a water-soluble synthetic polymer. (5) The hardening agent is one or a combination selected from ordinary Portland cement, blast furnace cement, fly ash cement, other cement materials, lime-based materials such as slaked lime, or asphalt-based materials. A method for introducing earth and sand into water according to claim 3.