JP6341818B2 - Manufacturing method of water shielding material - Google Patents

Description

  The present invention relates to a method for producing a water shielding material used for a water shielding layer of a waste disposal site for final disposal of industrial waste, general waste, and the like, for example.

  In recent years, the amount of industrial waste has tended to increase more and more, and along with this, the construction of final disposal sites has been promoted a lot regardless of whether it is at sea level or on land. By the way, in this type of managed final disposal site, how to suppress leakage of harmful substances contained in the waste to the outside of the disposal site is an important issue. For this reason, conventionally, steel sheet piles and steel pipe sheet piles have been placed on the outer peripheral side surface of the disposal site, and a water shielding sheet has been laid down including the bottom surface of the site to suppress leakage of harmful substances. However, steel sheet piles and steel pipe sheet piles have a problem of reliably shielding the inside of the joints, and the water shielding sheet is used to prevent unevenness of the laying surface or to prevent the ground from being damaged in order to prevent local damage. It is necessary to improve the ground so as not to cause subsidence.

  For this reason, recently, for example, in a sea surface disposal site, a sheet pile type revetment surrounding a landfill disposal area is doubled, or a joint portion of the sheet pile is filled with a water shielding material. In addition, a water shielding layer is formed by placing a water shielding material, solidified soil, or the like on the bottom of the disposal area. On the other hand, in land disposal sites, concrete or the like is placed in the ground surrounding the disposal area to form a continuous underground wall (water-impervious layer), or solidified soil or concrete is placed on the bottom of the disposal area. Therefore, the formation of a water shielding layer has been implemented.

Therefore, in Patent Document 1, as a water-blocking material used for a water-blocking structure in a waste disposal site, a fibrous reinforcing material is 0.2 to 2 in volume ratio on viscous soil having a water content ratio of 100 to 250%. 0.0%, 50 to 150 kg / m ^{3 of} a solidifying material is added, and the fibrous reinforcing material is disclosed using short fibers having a fiber diameter of 10 to 400 μm and a fiber length of 10 to 50 mm. ing.

Japanese Patent No. 4678496

  However, in the water-impervious material according to the invention of Patent Document 1, as a manufacturing method thereof, when the fibrous reinforcing material is mixed with a kneaded material having a water content ratio of 100 to 250% as a main material with a kneader, a fibrous material is used. Unless the reinforcing material is added in a very small amount, the fibrous reinforcing material cannot be uniformly mixed in the clay. For this reason, it takes time to produce a certain amount of a water shielding material that requires quality performance such as water shielding and strength. As a result, the production amount within a certain time is reduced, and the production unit price of the water shielding material is soared. Furthermore, conventionally, the fiber-reinforced material is mixed and agitated by kneading viscous clay as the main material, and kneaded, so that the agitation is excellent and the agitation performance (driving force necessary for agitation) is excellent. It is necessary to provide an apparatus, and it is necessary to improve the manufacturing method also from this point.

  This invention is made | formed in view of this point, It aims at providing the manufacturing method of the water shielding material which improves manufacturing capacity and becomes cheap, ensuring the performance required as a water shielding material. .

As a means for solving the above-mentioned problems, the present invention described in claim 1 is the manufacture of a water shielding material including water, fiber material, bentonite, fly ash, and solidifying material used in the water shielding layer. A method comprising: a first mixing step of mixing the water and the fiber material; a second mixing step of mixing and stirring the bentonite after the first mixing step; and after the second mixing step . And a third mixing step of mixing and stirring the solidified material, and a fourth mixing step of mixing and stirring the fly ash after the third mixing step .
In the first aspect of the invention, first, water and fiber material are mixed in the first mixing step. Thereby, compared with the past which disperse | distributes a fiber material in soil, a fiber material can be uniformly disperse | distributed in water more easily in a short time. Next, in the second mixing step, bentonite is added to water in which the fiber material is uniformly dispersed, and is stirred and kneaded. Thus, the bentonite is uniformly mixed while the bentonite is gradually entangled with the fiber material while the fiber material is uniformly dispersed. At this time, the slurry specific gravity of the water shielding material mixed according to the weight of the bentonite is increased and the viscosity is increased.
In the third mixing step, when the solidified material is mixed with the water containing the fiber material and bentonite, the viscosity increases with time due to the hydration reaction, and a certain strength is developed.
Furthermore, the bentonite is mixed and stirred in the water in which the fiber material is dispersed in the second mixing step, but the bentonite has a smaller weight ratio in the blend of the entire water shielding material produced than the fly ash which is the main material. Since the particle size is smaller than that of fly ash, a stirring device that stirs a mixture of bentonite and water containing fiber material does not require high stirring ability (driving force necessary for stirring). Furthermore, bentonite is an important material whose particle size is mainly less than 5 μm and makes the finally produced water-impervious material water-impermeable (water-impervious). When this bentonite is put into water as a lump, water is covered around the particle group that becomes a lump, but this bentonite has a property that water does not easily permeate between particles and easily aggregates (it tends to be lumpy). Nature). Therefore, in order to disperse this bentonite uniformly in the water, it is necessary to permeate the water between the bentonite particles, and the bentonite is mixed at an early stage immediately after mixing the fiber material with water, and then other constitution By appropriately ensuring the water penetration time including the mixing time of the members, bentonite can be dispersed uniformly without locally biasing, and bentonite can be uniformly dispersed, from the viewpoint of water shielding Is also effective. Further, in the fourth mixing step, the fly ash of the main material having the largest weight ratio to the whole is mixed and stirred, so the stirring device used in the fourth mixing step is the stirring device used in the second mixing step. In addition, it is necessary to have a higher stirring ability (driving force necessary for stirring) than the stirring device used in the third mixing step. The equipment cost of the equipment with high stirring capacity is expensive, and in order to increase the production quantity of the water shielding material per hour after mixing many materials, the equipment with high stirring capacity is mixed with high stirring load. It is effective to bear these continuously. Then, in the second mixing step and the third mixing step, a slurry that is supplied to the stirring device used in the fourth mixing step is prepared in advance by using an inexpensive stirring device having a low stirring capacity, and in the fourth mixing step. Continuously mixing fly ash having the largest weight ratio with the main material improves the production amount per hour, and as a result, the unit price of the water shielding material can be reduced.

The invention described in claim 2 is a method for producing a water shielding material including water, fiber material, bentonite, fly ash and solidified material used for the water shielding layer, and water containing a part of the bentonite ; A first mixing step for mixing the fiber material; a second mixing step for mixing and stirring the remainder of the bentonite after the first mixing step; and a mixture for mixing the solidified material after the second mixing step. And a third mixing step for stirring, and a fourth mixing step for mixing and stirring the fly ash after the third mixing step .
In the invention of claim 2, in the first mixing step, the fiber material is mixed with water containing a part of bentonite , and in order to slightly increase the viscosity of the water, a part of the bentonite (a little amount ( For example, about 10 to 50 kg of slurry specific gravity converted to 1.00 to 1.05 g / cm ³ ) per 1 m ³ of water is mixed with water. Thereby, in the first mixing step, it is possible to create a state in which the fiber material is uniformly dispersed in a large amount of water without being biased, and when the remaining bentonite is added and stirred, the fiber material and bentonite are made more uniform. To be distributed.
The water employed in the inventions of claims 1 and 2 may be seawater or fresh water. Moreover, polypropylene (PP) fiber, polyvinyl alcohol (PVA) fiber, polyethylene (PE) fiber, glass fiber (GA) fiber, etc. are employ | adopted for a fiber material.

The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, in the first mixing step, the fiber material is introduced into water that is filled or water containing a part of the bentonite. It is what.
In the invention of claim 3, the fiber material is uniformly dispersed in the water by sequentially adding the fiber material into water (water containing a part of bentonite ) filled in the stirring device. Specifically, in the first mixing step, first, a predetermined amount of water (water including a part of bentonite ) is filled in the stirring device, and an operator applies a predetermined amount of fiber material to the predetermined amount of water. Rather than throwing in small quantities, it is roughly divided into multiple batches. Since it is put into the water instead of the soil, the fiber material is quickly and uniformly dispersed in the water.
By the way, when the fiber material is poured into the water in the stirring device at once, it is necessary to lengthen the stirring time until the lump of the fiber material is loosened and uniformly dispersed. On the other hand, when a predetermined amount of fiber material is put into the stirrer and then a predetermined amount of water is put into the stirrer, the fiber material does not disperse well but becomes a lump, and the fiber material is stirred by the stirring blade of the stirrer. Get tangled. When the fiber material is put into the soil, it is added in small portions, but in order to mix it uniformly, a predetermined total amount may require a stirring time of about 20 minutes. On the other hand, when the subdivided fiber material is mixed with water, it can be uniformly dispersed in about one minute after the addition.

The invention described in claim 4 is characterized in that, in the invention described in any of claims 1 to 3, a dispersing agent is applied to the fiber material.
In the invention of claim 4, even when a fiber material having a specific gravity different from that of water is used, the fiber material is uniformly dispersed in water by the dispersant. In addition, by applying a dispersing agent during the production of this fiber material, the fiber material can be bundled into a bundle of several tens of pieces and cut into a predetermined length, and the fiber material can be handled at the time of packing and loading. Becomes easy. In other words, since the fiber material to be handled is thin and short, when the fiber is in a dry state, the fiber material rises in the air at the time of packing or when it is put in, making it difficult to handle, but it is difficult to handle by applying a dispersant to the fiber material during manufacturing. Can be easily.

The invention described in claim 5 is the invention described in any one of claims 1 to 4 , wherein in the fourth mixing step, the fly ash is charged in a plurality of times, and the fly ash is charged and stirred. It is characterized by performing work alternately.
In the invention of claim 5 , the fiber material, bentonite, solidified material and fly ash can be uniformly dispersed.

The invention described in claim 6 is the invention described in any one of claims 1 to 5 , wherein the solidification material is blast furnace cement, and a weight ratio of the fly ash to the blast furnace cement is 12 to 9.6. it is characterized in that.
In invention of Claim 6 , since it mix | blends in the ratio of fly ash: blast furnace cement = 12-9.6 : 1 by weight ratio, the elution of a harmful substance can be suppressed.

According to the method for producing a water shielding material according to the present invention, since the fiber material and bentonite can be uniformly dispersed and mixed, desired water shielding properties, strength, and toughness during deformation can be ensured. Moreover, the stirring time etc. can be shortened compared with the past, the manufacturing time can be shortened significantly, and a total cost can be reduced.

FIG. 1 is a schematic view showing a sea level disposal site equipped with a water shielding layer using a water shielding material by a manufacturing method according to an embodiment of the present invention. FIG. 2 is a schematic view of a production facility for embodying the production method. FIG. 3 is a manufacturing flow diagram for explaining the present manufacturing method.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
The water shielding material 10 is used for the water shielding layer 6 provided in a waste disposal site for final disposal of industrial waste, general waste, and the like, for example.

FIG. 1 shows a sea level disposal site provided with a water shielding layer 6. The landfill disposal area 1 in this sea surface disposal site is set in the inner water area B that is cut off from the outer water area A by the revetment 2.
The revetment 2 is a caisson-type revetment here, with a caisson 4 installed on a rubble mound 3 built on the seabed ground (here, a poorly permeable ground) G, and a backstone behind the caisson 4 It consists of a back-up layer 5 that has been introduced and created. The back surface of the back layer 5 on the inner water area B side is a slope, and the water shield 10 is placed on the slope of the back layer 5 and the bottom surface of the landfill disposal area 1. The water layer 6 is continuously formed. Here, the water-impervious layer 6 is formed so that the thickness t2 on the bottom surface of the landfill disposal area 1 is larger than the thickness t1 on the slope of the backing layer 5. For example, the thicknesses t1 and t2 are set to about t1 = 0.5 m and t2 = 2.0 m. Further, if desired, a water shielding sheet may be laid in advance on the slope of the backing layer 5 and the water shielding layer 6 may be formed on the water shielding sheet.

  As described above, the water shielding layer 6 is formed by placing the water shielding material 10. The water shielding material 10 is formed by mixing a fiber material, a granular material, a solidified material, and seawater at a predetermined weight ratio (mixing ratio). In this embodiment, seawater is used to form the water shielding material 10 to be placed on the water shielding layer 6 in the sea surface disposal site, but the water shielding to be placed on the water shielding layer 6 in the land disposal site. When the material 10 is formed, fresh water such as industrial water or river water is used.

Polypropylene fiber (PP) is adopted as the fiber material. In addition to polypropylene fibers, for example, polyvinyl alcohol (PVA) fibers, polyethylene (PE) fibers, polyamide (PA) fibers, vinylon fibers, glass fibers (GF), tent fabric end materials, etc. may be employed as the fiber material. it can. Polypropylene fiber has a specific gravity of 0.9 g / cm ³ and floats in water, while polyvinyl alcohol fiber has a specific gravity of 1.3 g / cm ³ and sinks in water. Fibers and polyvinyl alcohol fibers may be used together. It is preferable to use a fiber material having a fiber diameter of 10 to 18 μm and a fiber length of 9 to 20 mm.

  A dispersing agent is applied to the polypropylene fiber so as to uniformly disperse the polypropylene fiber when it is introduced into seawater. As the dispersant, for example, an amine-based or paraffin-based agent is employed. In addition, by applying a dispersing agent, it can be bundled into a bundle of dozens of units in the air, and when moving a predetermined amount of polypropylene fiber, such as when packing or at the time of loading, the polypropylene fiber soars in the air. Can be suppressed. As a result, by applying the dispersant to the polypropylene fiber, it becomes easy to handle the polypropylene fiber at the time of packing or at the time of charging.

Bentonite and fly ash are adopted as the granular material. Bentonite is a so-called clay mineral. The particle size of the bentonite is mainly less than 5 μm, and in the case of a lump, water does not easily penetrate between the particles and has a property of being easily aggregated. The bentonite is employed as a component of the water shielding material 10 in order to improve the water shielding performance.
Fly ash is generated at the time of combustion in a thermal power plant using coal as fuel. The particle size of fly ash is in the range of 5 μm to 75 μm. Since fly ash has substantially the same particle size, the gap between the particles is large, and moisture easily escapes, so that a liquefaction phenomenon occurs due to vibration or the like. In other words, fly ash has a property of retaining moisture between the particles, and thus has a property that the particles are easily separated and are not easily aggregated.

  Blast furnace cement is used as the solidifying material. When the blast furnace cement is mixed with seawater, the viscosity increases with time due to a hydration reaction, and the components of the water shielding material 10 are solidified integrally. Moreover, the blast furnace cement can suppress elution of harmful substances contained in fly ash. In the present embodiment, blast furnace cement is used as the solidifying material, which is the best mode, but ordinary Portland cement or the like can also be used.

  The water shielding material 10 is blended at a weight ratio of fly ash: bentonite = 9 or less: 1, fly ash: blast furnace cement = 12 or less: 1, and (fly ash + blast furnace cement + Bentonite): seawater = mixed at a ratio of approximately 10: 6. Moreover, a polypropylene fiber is added by the ratio of 0.5%-1.0% of the whole by volume ratio.

A specific blending example of the water shielding material 10 is shown below. When the entire water shielding material 10 is 1516.5 (kg / m ³ ), fly ash is 699.2 (kg / m ³ ), bentonite is 174.8 (kg / m ³ ), and blast furnace cement is 72. 8 (kg / m ³ ), polypropylene fiber is blended at 5.4 (kg / m ³ ), and seawater is blended at 564.3 (kg / m ³ ).

Next, the manufacturing equipment 20 for manufacturing the above-described water shielding material 10 will be briefly described with reference to FIG.
The manufacturing facility 20 is disposed in the vicinity of the water shielding layer 6 on which the water shielding material 10 is placed. The production facility 20 includes a first plant facility 21 that mixes polypropylene fiber and bentonite with seawater, a second plant facility 22 that mixes blast furnace cement with the mixture from the first plant facility 21, and the second plant facility 22. A third plant facility 23 for mixing fly ash with the mixture from

  The first plant facility 21 includes a bentonite silo 25 that measures bentonite, a first stirrer (batch mixer) 26 that stirs a mixture of bentonite, polypropylene fiber, and seawater charged from the bentonite silo 25; A first agitator 27 that temporarily communicates the mixture of bentonite, polypropylene fiber, and seawater in communication with the first agitator 26, and the second agitator 36 of the second plant facility 22 stores the mixture from the first agitator 27. And a first pressure-feeding pump 28 for pressure-feeding. The first agitator 26 communicates with the seawater pressure pump 50. The first agitator 27 has a stirring ability (driving force necessary for stirring) for suppressing separation of the kneaded mixture.

  The second plant facility 22 includes a blast furnace cement silo 35 for measuring blast furnace cement, and a second agitator (batch type) for agitating a mixture of blast furnace cement, bentonite, polypropylene fiber, and seawater charged from the blast furnace cement silo 35. A second agitator 37 for temporarily storing a mixture of the blast furnace cement, bentonite, polypropylene fiber and seawater, and a third mixture from the second agitator 37 in communication with the second agitator 36. And a second pumping pump 38 for pumping to the third stirring device 46 of the plant facility 23. Note that the second agitator 37 also has a stirring ability for suppressing the separation of the kneaded mixture, like the first agitator 27.

  The third plant facility 23 agitates a fly ash silo 45 that measures fly ash, and a mixture of fly ash, blast furnace cement, bentonite, polypropylene fiber, and seawater charged from the fly ash silo 45. A mixture of fly ash, blast furnace cement, bentonite, polypropylene fiber and seawater (water-insulating material 10) that is kneaded and communicated with the third agitator (batch type ribbon mixer) 46 that forms 10 and the third agitator 46 ) Once and a third pumping pump 48 for pumping the water shielding material 10 from the third agitator 47 to the water shielding layer 6. Note that the third agitator 47 also has a stirring ability for suppressing separation of the kneaded mixture, like the first and second agitators 27 and 37. Further, the third stirring device 46 of the third plant facility 23 has a stirring ability higher than that of the first stirring device 26 of the first plant facility 21 and the second stirring device 36 of the second plant facility 22.

Next, a method for manufacturing the water shielding material 10 using the manufacturing equipment 20 described above will be described based on the manufacturing flow shown in FIG.
First, in step S <b> 1, a predetermined amount of seawater is pumped to the first stirring device 26 of the first plant facility 21 by the seawater pump 50.

Next, in step S2, the first stirrer 26 is driven, and the operator divides a predetermined amount of polypropylene fiber into the seawater in the first stirrer 26 as a fiber material and divides it into multiple times for several minutes. Put in slowly over a period of time. At this time, it is possible to prevent the polypropylene fibers from being agglomerated by adding a predetermined amount of polypropylene fiber in a small amount instead of all at once. Since the polypropylene fiber is coated with a dispersant, it is uniformly dispersed when the polypropylene fiber is introduced into the sea. Specifically, because the specific gravity of the polypropylene fiber is 0.9 g / cm ³ , Slightly diffuses in the upper part of the sea. Moreover, by applying the dispersant, the polypropylene fibers can be bundled into a bundle of dozens of units at the time of packing such as shipping, and when taking out a predetermined amount of polypropylene fibers at the time of unpacking, the polypropylene fibers are in the air. It is possible to suppress soaring. In short, the dispersant facilitates the handling of the polypropylene fibers in the atmosphere, and the polypropylene fibers can be uniformly dispersed when introduced into seawater. Step S1 and step S2 correspond to the first mixing step.

  Next, in step S3, the bentonite to be charged is measured by the bentonite silo 25, and a predetermined amount of bentonite is slowly charged into the first agitator 26 of the first plant facility 21 over a period of several minutes. Bentonite is mixed with seawater containing polypropylene fiber. Then, the bentonite, polypropylene fiber and seawater are stirred for a predetermined time (several minutes) by the first stirring device 26 and kneaded. As a matter of course, the first stirring device 26 is driven from the first time point when the polypropylene fiber is charged until the bentonite is charged. The weight ratio of bentonite to the whole is also an appropriate amount. By mixing and stirring bentonite at this stage, seawater can penetrate between the particles of bentonite to suppress bentonite aggregation, making bentonite and polypropylene fiber uniform. Can be dispersed. A mixture of these bentonite, polypropylene fiber and seawater is once stored in the first agitator 27. Step S3 corresponds to the second mixing step.

  Next, in step S4, a predetermined amount of a mixture of bentonite, polypropylene fiber, and seawater is pumped from the first agitator 27 of the first plant facility 21 to the second stirring device 36 of the second plant facility 22 by the first pumping pump 28. .

  Next, in step S5, the blast furnace cement to be charged is weighed by the silo 35 for blast furnace cement, and this predetermined amount of blast furnace cement is charged at once into the second agitator 36 of the second plant facility 22, and bentonite, polypropylene fiber And blast furnace cement is mixed with seawater. In this step S5, blast furnace cement is charged all at once in order to shorten the manufacturing time. Then, the blast furnace cement, bentonite, polypropylene fiber, and seawater are stirred and kneaded for a predetermined time (several minutes) by the second stirring device 36. Naturally, the second stirring device 36 is driven while the blast furnace cement is being charged. Thereafter, a mixture of blast furnace cement, bentonite, polypropylene fiber, and seawater is temporarily stored in the second agitator 37. Step S5 corresponds to the third mixing step.

  Next, in step S6, a predetermined amount of a mixture of blast furnace cement, bentonite, polypropylene fiber and seawater is fed from the second agitator 37 of the second plant facility 22 to the third agitator 46 of the third plant facility 23 by the second pumping pump 38. To pump.

  Next, in step S7, the fly ash to be charged, that is, a portion corresponding to 1/3 of the total weight of the fly ash, is measured by the fly ash silo 45, and this predetermined amount of fly ash is measured at the third plant facility 23. 3 Charge the stirring device 46 over several minutes. Then, the fly ash (corresponding to 1/3 of the total weight of the fly ash), blast furnace cement, bentonite, polypropylene fiber and seawater are stirred and mixed by the third stirring device 46 for a predetermined time T1. As a matter of course, the third stirring device 46 is driven while the fly ash is being charged.

  Next, in step S8, as in step S7, 1/3 of the total weight of the fly ash is measured by the fly ash silo 45, and this predetermined amount of fly ash is measured at the third plant facility 23. 3 Charge the stirring device 46 over several minutes. Then, the fly ash (corresponding to 2/3 of the total weight of the fly ash), blast furnace cement, bentonite, polypropylene fiber and seawater are stirred and mixed by the third stirring device 46 for a predetermined time T2. Note that the stirring time T2 by the third stirring device 46 in step S8 is substantially the same as the stirring time T1 by the third stirring device 46 in step S7.

  Next, in step S9, as in steps S7 and S8, 1/3 of the total weight of the fly ash is measured by the fly ash silo 45, and this predetermined amount of fly ash is measured at the third plant facility 23. The third stirring device 46 is charged over several minutes. Then, the fly ash (fly ash total weight), blast furnace cement, bentonite, polypropylene fiber and seawater are stirred and kneaded for a predetermined time T3 by the third stirring device 46, and the manufacture of the water shielding material 10 is completed. The water shielding material 10 is formed by uniformly dispersing fly ash, bentonite, blast furnace cement, and polypropylene fibers. At this time, the water shielding material 10 is not solidified and the fluidity is ensured. Thus, fly ash is mixed in the final process in the manufacturing process of the water shielding material 10, that is, steps S7 to S9. The fly ash has the most weight ratio with respect to the entire water shielding material 10. It is large and the particle size is 5 μm to 75 μm and has the property that it is difficult to form agglomerates. Therefore, mixing in the final step is the best mode. Thereafter, the water shielding material 10 is temporarily stored in the third agitator 47.

  The stirring time T3 by the third stirring device 46 in step S9 is set longer than the stirring time T1 (or T2) by the third stirring device 46 in step S7 (or S8). Specifically, the stirring time T3 in step S9 is set to be about three times longer than the stirring time T1 (or T2) in step S7 (or S8). Steps S7 to S9 correspond to a fourth mixing step.

  In step S <b> 10, the water blocking material 10 is pumped from the third agitator 47 to the water blocking layer 6 by the third pumping pump 48.

  As described above, according to the embodiment of the present invention, the water shielding material 10 to be placed on the water shielding layer 6 is formed by mixing seawater, polypropylene fiber, bentonite, blast furnace cement, and fly ash in this order. Therefore, polypropylene fiber, bentonite, blast furnace cement, and fly ash can be uniformly dispersed, and required water barrier properties, strength, and toughness during deformation can be ensured. Moreover, according to this manufacturing method, the manufacturing time can be significantly shortened compared with the past, and furthermore, the first stirring device 26 (used in steps S1 to S3) and the second stirring device 36 (in step S5). Use) does not need to have a high stirring ability (driving force necessary for stirring), so the total cost can be reduced.

In particular, since the water shielding material 10 includes fly ash as a granular material, it is possible to effectively use unnecessary fly ash generated in large quantities during combustion in a thermal power plant using coal as fuel. The cost of the water material 10 itself can be reduced. Further, since the water shielding material 10 is blended at a weight ratio of fly ash: bentonite = 9 or less: 1, the water permeability coefficient k of the water shielding material 10 is 1 × 10 ⁻⁶ cm / s or less. Can be secured. In addition, by weight ratio, fly ash: blast furnace cement = 12 or less: 1 ratio, so not only the elution of hexavalent chromium, but also the elution of other harmful substances contained in fly ash Can also prevent.

  In the embodiment of the present invention, bentonite is mixed as a granular material in step S3, which is the best mode. However, in step S3, a portion of fly ash is mixed instead of bentonite, and bentonite is mixed. You may mix with blast furnace cement in step S5. However, in this embodiment, there is a concern in terms of cost because the number of facilities increases, such as the need to add one fly ash silo 45.

In the embodiment of the present invention, a predetermined amount of seawater is pumped to the first stirrer 26 of the first plant facility 21 by the seawater pump 50 in step S1, and the first stirrer 26 in step S2 In step S1, a predetermined amount of seawater is pumped to the first stirrer 26 of the first plant facility 21 and then bentonite is added. A part of the mixture is mixed with seawater (for example, about 10 to 50 kg with respect to 1 m ^{3 of} water, converted to a slurry specific gravity of 1.00 to 1.05 g / cm ³ ) in seawater, and then a predetermined amount of polypropylene fiber is mixed in step S2 You may let them. In the case of this embodiment, in step S3, the remaining amount of bentonite is added except for the amount added in step S1. Thereby, in step S2, it is possible to create a state where polypropylene fibers are uniformly dispersed in a large amount of seawater. In step S3, the remaining bentonite is mixed and stirred, so that the polypropylene fibers and bentonite can be more uniformly dispersed.

  6 water shielding layer, 10 water shielding material, 20 production facility, 21 first plant facility, 22 second plant facility, 23 third plant facility, 25 bentonite silo, 26 first stirring device, 27 first agitator, 28 first 1 pressure feed pump, 35 silo for blast furnace cement, 36 2nd stirring device, 37 2nd agitator, 38 2nd pressure feeding pump, 45 fly ash silo, 46 3rd stirring device, 47 3rd agitator, 48 3rd pressure feeding pump, 50 Seawater pressure pump

Claims (6)

A method for producing a water shielding material including water, fiber material, bentonite, fly ash and solidified material used for a water shielding layer,
A first mixing step of mixing the water and the fiber material;
A second mixing step of mixing and stirring the bentonite after the first mixing step;
A third mixing step of mixing and stirring the solidified material after the second mixing step;
A fourth mixing step of mixing and stirring the fly ash after the third mixing step;
A method for producing a water shielding material, comprising: A method for producing a water shielding material including water, fiber material, bentonite, fly ash and solidified material used for a water shielding layer,
A first mixing step of mixing water containing a part of the bentonite and the fiber material;
A second mixing step of mixing and stirring the remainder of the bentonite after the first mixing step;
A third mixing step of mixing and stirring the solidified material after the second mixing step;
A fourth mixing step of mixing and stirring the fly ash after the third mixing step;
A method for producing a water shielding material, comprising: 3. The method for manufacturing a water shielding material according to claim 1, wherein in the first mixing step, the fiber material is poured into filled water or water containing a part of the bentonite . 4.   The method for producing a water shielding material according to claim 1, wherein a dispersing agent is applied to the fiber material. And in the fourth mixing step, it was charged separately the fly ash into a plurality of times, shielding according to any one of claims 1 to 4, characterized in that a stirring work and the input operations of the fly ash alternately Manufacturing method of water material. The solidifying material is blast furnace cement;
The method for producing a water shielding material according to any one of claims 1 to 5 , wherein a weight ratio of the fly ash to the blast furnace cement is 12 to 9.6 .

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