JPH09228237A - Base fabric for spray water interception sheet engineering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base fabric for a spray water interception sheet engineering method, slight in influence on a curing time caused by difference in a permeating solution of delayed coagulation, not causing problems such as sagging, etc., under a severe condition such as a steep slope, high in impregnation and retention of the permeating solution of delayed coagulation, capable of providing a water interception sheet showing sufficient water intercepting effect even by one spray. SOLUTION: This base fabric is used for a spray water interception sheet engineering method which sprays a permeating solution of delayed coagulation consisting essentially of a metal oxide containing anionic rubber asphalt emulsion. The base fabric comprises a fabric containing >=5% of a treated acrylic fiber obtained by saponifying the surface of an acrylonitrile based polymer with an aqueous solution of an alkali metal hydroxide and treating the surface of the saponified acrylic fiber with an aqueous solution of a polyvalent metal salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base cloth for a sprayed water-blocking sheet construction method, and more particularly, to a ground surface for securing water-blocking property by construction at a site such as a waste landfill treatment plant, a reservoir, or a waterway. The present invention relates to a base fabric for a sprayed water-blocking sheet construction method in which a base fabric is directly laid on and then water-blocking is obtained by spraying.

[0002]

2. Description of the Related Art Conventionally, as a method of spraying a water blocking sheet of this type, Japanese Patent Publication No. 51-46983 discloses a method of laying a non-woven fabric on the ground surface and then, for example, a bituminous emulsion and a hydrophilic urethane prepolymer on the non-woven fabric surface. There is known a method of forming a waterproof layer of a mixture of

Further, in Japanese Unexamined Patent Publication (Kokai) No. 2-200911, a chemical agent for accelerating the curing of a polymeric coating film waterproofing agent is added between two upper and lower layers of a polyolefin non-woven fabric to shorten the curing time and eventually cause blistering. A construction method for preventing the above is known.

In Japanese Patent Laid-Open No. 3-17308, after a porous sheet is laid on the ground surface, a slow coagulating penetrating liquid is sprayed and impregnated on the entire surface of the sheet to impregnate the sheet with a water blocking agent of a slow coagulating agent. A sprayed waterproof sheet construction method for forming a film is known.

Further, in Japanese Patent Laid-Open No. 3-147919, in a horizontal knitted fabric, each of the vertical and horizontal wefts is applied with a load of 1 kg.
With a low load extensibility that elongates by 0.5% or more, the thickness is 0.5 mm
After laying on the ground surface a knitted fabric for the water-blocking sheet method having a weight per unit area of 0.01 to 0.2 Kg / cm2, the knitted fabric is permeable to rubber asphalt emulsion or the like. Spray the material on the entire surface, impregnate the knitted fabric,
There is known a sprayed waterproof sheet that forms a waterproof film on the knitted fabric.

Further, in Japanese Patent Laid-Open No. 5-9914,
A porous sheet material of a multi-layer structure knitted fabric having different wale densities on the front and back sides. By setting the wale density of the outer fabric to 75% or less of the wale density of the lining, the impregnating ability of the base fabric is improved, and the water impermeable A method of preventing defects such as cracks due to bubbles generated in the film is also known.

[0007]

However, among the above publications, JP-B-51-46983 and JP-A-2-2
The contents disclosed in Japanese Patent Laid-Open No. 00911 and Japanese Patent Laid-Open No. 3-17308 both use a nonwoven fabric. If the elongation and strength of the non-woven fabric are low and the unevenness of the ground surface is large, the laying work becomes difficult, wrinkles are likely to occur during the laying, and it is easily damaged by daily loose loads such as people running. There was a problem.

Further, the construction methods disclosed in JP-A-3-147919 and JP-A-5-9914 are
All of them are aimed at improving the elongation and low strength of the non-woven fabric, and also aiming at the fluidity of the slow coagulating penetrant liquid and the uniformity of the finished thickness. Problems such as sagging such as construction on such slopes cannot be completely avoided, and it is the current situation that a double layer is blown and a top coat is used to form a thick layer on the surface to provide water impermeability.

The present invention solves the above problems and does not cause sagging or the like even during the influence of the hardening time due to the difference in the slowly coagulating penetrating liquid, and even under the severe conditions such as a steep slope. An object of the present invention is to provide a base fabric for a sprayed water-blocking sheet construction method that has a sufficient water-blocking performance even with a single blow.

[0010]

In order to achieve the above-mentioned object, the base fabric for spraying water-blocking sheet method of the present invention is a slowly coagulating penetrating liquid containing a metal oxide-containing anionic rubber asphalt emulsion as a main component. Is a base cloth used for a spraying water-blocking sheet construction method of spraying and impregnating the surface of a saponified acrylic fiber whose surface is saponified by treating an acrylonitrile-based polymer with an aqueous alkali metal hydroxide solution. It is characterized in that it is made of a cloth containing 5% or more of treated acrylic fibers treated with an aqueous solution.

The base fabric for a sprayed water-blocking sheet construction method according to claim 1 having the above-mentioned structure has an effect on the curing time due to the difference in the slowly coagulating and penetrating liquid, and also when it is applied under severe conditions such as a steep slope. It is a base fabric for a sprayed waterproof sheet construction method that does not cause problems such as sagging and has sufficient waterproof performance even with a single blow.

Further, the base fabric for the sprayed water-blocking sheet method of the present invention has a concentration of the alkali metal hydroxide aqueous solution of 6.00 to treat the acrylonitrile polymer to saponify the surface.
It can be 8.85 mol / 1000 g or less.

The base cloth for spraying and water-blocking sheet construction according to claim 2 having the above-mentioned constitution is hydrophilized by a hydrolysis reaction, and becomes an excellent hydrophilic cross-linked polymer.

Further, in the base fabric for the sprayed water-blocking sheet construction method of the present invention, the cloth is composed of treated acrylic fibers and fibers having a strength 1.2 times or more stronger than the fibers, and the ratio of the treated acrylic fibers. Can be 5 to 70% by weight.

The base fabric for a sprayed water-blocking sheet method according to claim 3 having the above-mentioned structure has a reinforcing effect by a fiber having a strength 1.2 times or more stronger than that of the treated acrylic fiber, and at the same time, it is composed of a slowly coagulating permeable liquid. Curing is also excellent.

Further, in the base cloth for the sprayed water-blocking sheet construction method of the present invention, the cloth has a porosity of 75 to 9 made of a multi-layer structure knitted fabric.
It can be 8% porous fabric.

The base cloth for a sprayed water-blocking sheet construction according to claim 4 having the above-mentioned structure has good impregnation property and retention of the slowly coagulating penetrant liquid, and cracks are generated inside the base cloth. There is no.

Further, in the base cloth for the sprayed water-blocking sheet method of the present invention, the treated acrylic fibers may be inserted in the inlay structure of the double-knit triple structure knitted fabric in an amount of 5 to 45% of the total weight of the cloth. .

The base cloth for a sprayed water-blocking sheet construction according to claim 5 having the above-mentioned constitution promotes hardening of the slowly coagulating penetrant liquid, and effectively uses treated acrylic fibers having relatively low strength. You can

Further, in the method of spraying water-blocking sheet using the base fabric of the present invention, the slowly coagulating penetrant liquid is a mixture of anionic rubber asphalt emulsion containing a metal oxide and an aqueous solution of ammonium salt as a gelling agent. It can be a mixed solution.

In the spraying water-blocking sheet method using the base cloth having the above-mentioned structure according to claim 6, gelation of the slowly coagulating penetrating liquid is uniform and stable, and a large amount of spraying is possible,
Construction efficiency can be greatly improved.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the embodiments of the present invention will be described below. The acrylic fiber used in the present invention is a fiber made of a known and well-known acrylonitrile polymer.

The saponified acrylic fiber can be obtained by treating the acrylonitrile polymer with an aqueous alkali metal hydroxide solution to saponify the surface. Typically, the alkali metal hydroxide that saponifies the acrylic fiber surface is typically sodium hydroxide, potassium hydroxide, or the like, but any compound can be used.

In this case, the concentration of the alkali metal hydroxide aqueous solution is preferably 6.0 to 8.85 mol / 1000 g. When it is less than 6.0 mol / 1000 g, the acrylonitrile polymer is hydrophilized by the hydrolysis reaction, but only a water-soluble polymer is produced, and it may be difficult to become a hydrophilic cross-linked polymer. Conversely, 8.85 mol / 10
If the amount exceeds 00 g, the activity of the alkali metal hydroxide decreases, so that high-temperature treatment becomes necessary, and problems such as difficulty in residual alkali removal treatment may occur. Is preferred.

The surface of the saponified acrylic fiber is treated with a polyvalent metal salt aqueous solution. By treating the surface of the saponified hydrophilic crosslinked polymer fiber with a polyvalent metal salt aqueous solution,
Salt is formed on the fiber surface. The treated acrylic fiber thus obtained acts as an emulsion breaker, accelerates the hardening of the slowly coagulating and penetrating liquid, and prevents it from flowing out.

The polyvalent metal salt used here is not particularly limited, but those which are easily water-soluble, have excellent emulsion coagulation performance, and have been confirmed to be safe for the human body, such as calcium chloride and iron alum. , Potassium alum, etc. The concentration of the aqueous solution is 1 to 2 from the viewpoint of economic efficiency and capture effect.
A 0% by weight aqueous solution, more preferably a 3 to 12% by weight aqueous solution is used. Further, according to this method, it is possible to avoid the influence of deterioration of the treatment effect due to rainfall, which is a concern during construction.

The treated acrylic fiber is mixed with any other fiber, for example, polyester fiber, polyamide fiber, polyolefin fiber, acrylic fiber, aramid fiber, synthetic fiber such as carbon fiber, or natural fiber such as hemp and cotton. A fabric can be constructed. In this case, the treated fabric contains the treated acrylic fiber in an amount of 5% or more. If it is less than 5%, the effect of accelerating the hardening of the slowly coagulating penetrant liquid and preventing it from flowing out is small. It is preferable to use 100% from the viewpoint of shortening the curing time and preventing outflow, but the treated acrylic fiber has a relatively low basic strength and is more expensive than other general-purpose fibers. It is preferable to mix an appropriate amount in terms of degree, scale, and cost.

Further, the time and method for mixing the treated acrylic fiber with other fibers are arbitrary, and may be in the state of the acrylic fiber before saponification or in the state of the saponified acrylic fiber, Furthermore, it may be in the state of treated acrylic fibers whose surface is treated with a polyvalent metal salt aqueous solution. In the case of mixing before making the treated acrylic fiber, it is natural to make the treated acrylic fiber by any means after mixing.

The other fibers mixed with the treated acrylic fibers are preferably fibers having a strength 1.2 times or more that of the treated acrylic fibers. When the strength is less than 1.2 times, the reinforcing effect becomes weak. A more preferable range is 1.5 times or more, and a higher upper limit is preferable, but it is appropriately determined in consideration of cost. When mixed, the treated acrylic fiber content is preferably 5 to 70% by weight.

When the treated acrylic fiber content is less than 5%, the rubber asphalt emulsion trapping effect is small, while when it exceeds 70%, the reinforcing effect of the cloth is small and the strength is required to be large. Not preferable. And it is more suitable that it is 10 to 50%. As the method for mixing other fibers to be mixed, any method such as mixed spinning, mixed fiber, and mixed weaving can be adopted, and it is also preferable to perform entanglement treatment. Here, the entanglement treatment is not particularly limited, and examples thereof include interlace treatment, air entanglement treatment (taslan processing), and composite false twist. An example of a suitable yarn is a yarn in which the treated acrylic fiber is entangled at a ratio of 5 to 70% by weight.

In the present invention, the structure of the fabric used for the base fabric for the sprayed water-impervious sheet method may be woven fabric, knitted fabric, or the like, but it is stretchable, in particular, stretchable to follow irregularities on the ground surface. A knitted fabric is preferable.

When a multi-layer structure knitted fabric is used for the base fabric for the sprayed water-blocking sheet method of the present invention, it is preferably a porous knitted fabric having a porosity of 75 to 98%. The main purpose of using a multi-layer structure knitted fabric is to improve the elongation and low strength of the non-woven fabric, to facilitate the laying work even in a place with large unevenness of the ground surface, and to carry out daily upward movement such as running by people. It is not easily damaged by a loose load from. further,
If the construction is performed using the thickness of the multi-layer structure knitted fabric that is set to a constant value in advance, it is possible to easily make the sheet thickness uniform without requiring skill.

From the viewpoint of impregnation with the slowly coagulating penetrant liquid, the porosity is preferably 75 to 98%. 75
If it is less than 98%, cracks may occur inside the base fabric after it is formed on the water-impervious sheet, and the water impermeability may be reduced. It becomes insufficient and cracks easily occur inside the base fabric. From these viewpoints, the porosity is particularly preferably 85 to 94%.

In particular, the treated acrylic fiber is used as an inlay structure of a double-knit triple structure knitted fabric in an amount of 5% of the total weight of the base fabric.
It is desirable to insert 45%. This is in consideration of measures for effectively using the fiber having relatively low tenacity. By arranging the fibers supplied with the fibers in the sheath portion of the core-sheath structure obtained by the air entanglement treatment (taslan processing), it is possible to effectively obtain a trapping portion having a high surface area. In this case, it is practical that the ratio of the fibers is 10 to 25%.

The slow-coagulating penetrating liquid used in the spraying water-blocking sheet method is mainly composed of anionic rubber asphalt emulsion containing a metal oxide, but the emulsion used has an excessive permeability when the emulsion concentration is too low. Therefore, the loss on the ground side increases. On the other hand, if it is too high, impregnation into the porous sheet will be insufficient, so that the solid content is preferably in the range of 50 to 80% by weight.

Generally, the rubber asphalt emulsion is generally selected such that rubber asphalt is selected in the case of a waterproof sheet for finishing, and asphalt emulsion may be selected in the case of a waterproof sheet for a base. It is not limited. Examples of the metal oxide include zinc oxide and magnesium oxide, and the content thereof is appropriately in the range of 0.1 to 5% by weight.

In the present invention, when the slowly coagulating penetrant liquid is a mixture of an anionic rubber asphalt emulsion containing a metal oxide and an aqueous ammonium salt solution as a gelling agent, the rubber asphalt emulsion to be used is Although it is anionic and contains a metal oxide, if the emulsion concentration is too low, the permeability becomes excessive and the loss on the ground surface side increases. On the other hand, if it is too high, impregnation into the porous sheet becomes insufficient. For this reason,
A solid content of 50 to 80% by weight is appropriate.

Examples of the ammonium salt as the gelling agent preferably used in the present invention include ammonium sulfate, ammonium nitrate, ammonium sulfanate, ammonium carbonate and the like, and the concentration of the aqueous solution is suitably in the range of 3 to 40% by weight. . The ammonium salt aqueous solution usually contains alcohol or its derivative.

Examples of the alcohol include methyl alcohol, ethyl alcohol, normal propyl alcohol,
Examples thereof include isopropyl alcohol, butyl alcohol, normal octyl alcohol, isooctyl alcohol, and the like, and the content ratio is appropriately in the range of 0.1 to 15% by weight.

Gelation when the slowly coagulating penetrating liquid used in the spraying water-blocking sheet method is a mixture of an anionic rubber asphalt emulsion containing a metal oxide and an ammonium salt aqueous solution as a gelling agent. The mechanism is that the metal oxide in the emulsion reacts with the ammonium salt as a gelling agent to form a metal ammonium complex salt, and when the pH is lowered, the metal ion is liberated, which reacts with the emulsifier in the emulsion and becomes insoluble. It relies on the formation of metallic soaps, which promotes destabilization of the emulsion and at the same time promotes uniform coagulation.

At this time, the alcohol and the derivative thereof act as a buffer for coagulation and work to bring about uniform coagulation.

Thus, the gelling mechanism of the slowly coagulating osmotic liquid used by mixing the ammonium salt as the gelling agent is as follows.
Since the emulsion is destroyed by the ammonium salt as a gelling agent, there is little variation in the physical properties even if the mixing ratio is slightly different, and large-scale spraying with a large spraying machine is possible, which can greatly improve the construction efficiency. Is a feature of.

[0043]

The present invention will be described more specifically with reference to the following examples. The characteristic values in the present specification were obtained by the following. Rubber asphalt capture rate = [(weight after 24 hours-base cloth weight) / base cloth weight] x 100% Porosity = [(base cloth volume-fiber volume-rubber ass volume) / base cloth volume] x 100% Water pressure resistance: Presence or absence of water leakage due to 1 kg / cm2 of pressurized water. The specific gravity of polyester was 1.38 g / cm3, the specific gravity of LANACE fiber was 1.16 g / cm3, and the specific gravity of rubber ass was 1.0 g / cm3.

Example 1 A 16-gauge circular knitting machine was used to produce the following multi-layer knitted fabric having a knit portion having a surface wale density of 8 pieces / inch and a backing wale density of 16 pieces / inch, an inlay portion and a tuck portion. did. 7.2 mol / 1000 of acrylonitrile polymer
A saponified acrylic fiber whose surface is saponified by treating with an aqueous solution of alkali metal hydroxide having a density of g (manufactured by Toyobo Co., Ltd.,
A spun yarn of 150 denier obtained from the trade name LAN ACE, dpf = 5 denier, 51 mm cut) was inserted as a basic unit in the inlay portion at 21% by weight. Other dress materials,
Polyester yarn (d) on the knit and tuck parts of the lining
pf = 5.2 denier, total 500 denier) was inserted. The obtained multi-layer structure knitted fabric having a thickness of 3.6 mm and a porosity of 93% was dipped in a calcium chloride aqueous solution (10% by weight), dried at 100 ° C. for 2 minutes, and then subjected to complete flooding treatment assuming rain. Then, air drying (48 hours) was performed. This sample was cut into 30 cm vertical and horizontal, and anionic rubber asphalt emulsion containing metal oxide (manufactured by Nisshin Kogyo Co., Ltd., trade name Pleno P Coat) (main ingredient A) and ammonium salt aqueous solution (Teikoku Chemical Industry Co., Ltd.) Manufactured by the brand name Acrysize ME-18) (hardening agent B), after being sufficiently dipped in a slowly coagulating penetrant liquid, attached on the 60 ° slope (1) of the pedestal shown in FIG. 1 (3), The rubber asphalt capture rate after 24 hours was evaluated (see FIG. 1). In order to improve the fluidity of the rubber asphalt, a bird-prevention net (2) having a mesh of 2 cm 2 was previously laid on the slope. In addition, the porosity and water pressure resistance after the rubber asphalt coating were measured. Rubber asphalt capture rate: 605% Porosity: 8% Water pressure resistance: No water leakage is observed. As described above, the rubber asphalt has a very high trapping performance and a low porosity, and it was a good result that no water leakage was observed even in the water pressure resistance test (see Table 1).

[0045]

[Table 1]

Example 2 Similarly, using a 16-gauge circular knitting machine, the outer surface wale density was 8
A multi-layer structure knitted fabric having a knit portion, an inlay portion, and a tuck portion having a book / inch and a backing wale density of 16 / inch was manufactured. 7.2 mol / 100 of acrylonitrile polymer
Saponified acrylic fiber whose surface has been saponified by treatment with an alkali metal hydroxide aqueous solution having a concentration of 0 g (Toyobo Co., Ltd.,
Made, product name Lanace, dpf = 5 denier, total 300 denier) in the sheath part, polyester yarn (strength is 2.2 times that of the saponified acrylic fiber, dpf = 5.2 denier, total 500 denier) Part, sheath overfeed 15%, core overfeed 5
The composite yarn subjected to the air entanglement treatment was inserted into the inlay portion at a weight ratio of 19%. In addition, a polyester yarn of 500 denier and 5.2 denier single yarn was inserted in each knit part and tuck part of the outer material and lining. The proportion of the acrylic fiber in the total weight of the multilayer structure knitted fabric was 7.5%.
The obtained multi-layer structure knitted fabric having a thickness of 3.7 mm and a porosity of 91% was dipped in a calcium chloride aqueous solution (10% by weight), and
After drying at 0 ℃ x 2 minutes, complete flooding treatment assuming rain
It was air-dried (48 hours). This sample is 30
Anionic rubber asphalt emulsion containing metal oxides (made by Nissin Kogyo Co., Ltd., trade name: Pleno P Coat) (main ingredient A) and ammonium salt aqueous solution (made by Teikoku Chemical Industry Co., Ltd., trade name Acrylic) Size ME-1
8) After sufficiently immersing in a slowly coagulating penetrating liquid consisting of (curing agent B), affixing to a 60 ° slope as in Example 1 2
The rubber asphalt capture rate after 4 hours was evaluated. In addition, the porosity and water pressure resistance after the rubber asphalt coating were measured. Rubber asphalt capture rate: 553% Porosity: 13% Water pressure resistance: No water leakage is observed. As described above, the rubber asphalt has a very high trapping performance and a low porosity, and it was a good result that no water leakage was observed even in the water pressure resistance test (see Table 1).

Comparative Example 1 Similarly, using a 16-gauge circular knitting machine, the outer surface wale density was 8
The following multi-layer structure knitted fabric having a knit portion, an inlay portion, and a tuck portion having a book / inch and a lining wale density of 16 / inch was manufactured. 7.2 mol / 1 of acrylonitrile polymer
A saponified acrylic fiber whose surface has been saponified by treatment with an aqueous solution of an alkali metal hydroxide having a density of 000 g (manufactured by Toyobo Co., Ltd., trade name Lanace, dpf = 5 denier, 5
A spun yarn of 150 denier obtained from a 1 mm cut) was used as a basic unit and inserted in the inlay portion at a weight ratio of 21%.
In addition, polyester yarns (dpf = 5.2 denier, total 500 denier) were inserted in the knit and tuck portions of the outer fabric and lining to obtain a multilayer structure knitted fabric having a thickness of 3.6 mm and a porosity of 93%. . This sample (not treated with a polyvalent metal salt) was cut into 30 cm in length and width, and an anionic rubber asphalt emulsion containing metal oxides (manufactured by Nisshin Kogyo Co., Ltd., trade name PLENO P coat) (main ingredient A ) And ammonium salt aqueous solution (Teikoku Chemical Industry Co., Ltd.)
Manufactured by Acrysize ME-18) (hardening agent B) and sufficiently immersed in a slowly coagulating penetrant liquid, and then stuck on a 60 ° slope as in Example 1, and rubber asphalt after 24 hours has passed The capture rate was evaluated. In addition, the porosity and water pressure resistance after the rubber asphalt coating were measured. Rubber asphalt capture rate: 456% Porosity: 26% Water pressure resistance: Water leakage occurred. Thus, the rubber asphalt trapping performance was low and the porosity was high, which was an inferior result that water leakage was observed even in the water pressure resistance test (see Table 1).

Comparative Example 2 Similarly, using a 16-gauge circular knitting machine, the outer surface wale density was 8
Polyester yarn (dpf = 5.2 denier, total 500 denier) was inserted into all the multi-layered knitted fabrics having a knit part, an inlay part, and a tuck part with a book / inch and a lining wale density of 16 pieces / inch (inlay). Part 20%,
Outer fabric part 20%, lining part 40%, tack part 20%). This sample was cut into 30 cm vertical and horizontal, and anionic rubber asphalt emulsion containing metal oxide (manufactured by Nisshin Kogyo Co., Ltd., trade name Pleno P Coat) (main ingredient A) and ammonium salt aqueous solution (Teikoku Chemical Industry Co., Ltd.) Manufactured by Acrysize ME-18) (hardening agent B) and sufficiently immersed in a slowly coagulating penetrant liquid, and then stuck on a 60 ° slope as in Example 1, and rubber asphalt after 24 hours has passed The capture rate was evaluated. In addition, the porosity and water pressure resistance after the rubber asphalt coating were measured. Rubber asphalt capture rate: 367% Porosity: 28% Water pressure resistance: Water leakage occurred. Thus, the rubber asphalt trapping performance was low and the porosity was high, which was an inferior result that water leakage was observed even in the water pressure resistance test (see Table 1).

[0049]

EFFECTS OF THE INVENTION The base fabric for a sprayed water-blocking sheet construction method according to the first aspect of the invention has an effect on the curing time due to the difference in the slowly coagulating and penetrating liquid, and also when applied under severe conditions such as a steep slope. It is a base fabric for a sprayed water-blocking sheet construction method that does not cause problems such as sagging and can provide excellent water-blocking performance even with a single blow. The base fabric for a sprayed water-blocking sheet method of the invention according to claim 2 is hydrophilized by a hydrolysis reaction and becomes an excellent hydrophilic cross-linked polymer. The base fabric for a sprayed water-blocking sheet method according to the third aspect of the present invention has a reinforcing effect by other fibers and is excellent in hardening of the slowly coagulating penetrant liquid. The base fabric for a sprayed water-blocking sheet method according to the fourth aspect of the present invention is excellent in impregnation and retention of the slowly coagulating permeable liquid, and does not cause cracks inside the base fabric. The base cloth for the sprayed water-blocking sheet method according to the fifth aspect of the present invention accelerates the hardening of the slowly coagulating and penetrating liquid, and can effectively use the treated acrylic fiber having a relatively low strength. In the spraying water-blocking sheet construction method using the base cloth according to claim 6, the gelation of the slowly coagulating penetrating liquid is uniform and stable, a large amount of spraying is possible, and the construction efficiency is significantly improved.

[Brief description of drawings]

FIG. 1 is a view showing a pedestal for measuring a rubber asphalt capture rate in the present invention.

[Explanation of symbols]

 1 Slope with a 60 degree inclination 2 Bird-proof net with mesh 2 cm 2 3 Fabric for 30 cm x 30 cm base cloth

Claims (6)

[Claims] 1. A base cloth used for a sprayed water-blocking sheet construction method, which comprises spraying and impregnating a slowly coagulating penetrating liquid containing an anionic rubber asphalt emulsion containing a metal oxide as a main component, which comprises an acrylonitrile polymer. It is characterized by comprising a cloth containing 5% or more of treated acrylic fiber obtained by treating the surface of saponified acrylic fiber treated with an aqueous solution of alkali metal hydroxide to saponify the surface with an aqueous solution of polyvalent metal salt. Base cloth for spraying water-blocking sheet construction method. 2. The concentration of an alkali metal hydroxide aqueous solution for treating an acrylonitrile polymer to saponify the surface is
The base fabric for the sprayed water-blocking sheet construction method according to claim 1, wherein the base fabric is 6.00 to 8.85 mol / 1000 g. 3. The cloth is composed of treated acrylic fibers and other fibers having a strength 1.2 times or more stronger than the fibers, and the proportion of the treated acrylic fibers is 5 to 70% by weight. The base fabric for the sprayed water-blocking sheet construction method according to claim 1 or 2. 4. The base fabric for a sprayed water-blocking sheet construction method according to claim 1, 2 or 3, wherein the fabric is a porous fabric having a porosity of 75 to 98% made of a multi-layer structure knitted fabric. 5. The treated acrylic fiber is inserted in an amount of 5 to 45% of the total weight of the fabric in the inlay structure of the fabric composed of the double knit triple structure knitted fabric. The base fabric for the sprayed water-blocking sheet construction method according to 4. 6. The slowly coagulating penetrating liquid is a mixed liquid obtained by mixing an anionic rubber asphalt emulsion containing a metal oxide and an aqueous ammonium salt solution as a gelling agent. The base fabric for the sprayed water-blocking sheet construction method according to 3, 4, or 5.