JPH0769036B2 - Anticorrosion coating structure and distribution method for water pipes - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion coating structure for water pipes of waterworks, sewers and the like, particularly a water pipe bridge exposed to the atmosphere and its attached structural materials, and a method for coating the same.

[0002]

2. Description of the Related Art In general, for the anticorrosion of a water pipe or the like, the surface of the metal is shielded from the outside air by coating the surface thereof with a rust preventive paint or a petrolatum type anticorrosive coating material.

Conventionally, the rust preventive paint most commonly used as such a coating material is prevented by compounding a heavy metal pigment such as an iron oxide pigment, a lead pigment or a chromate pigment in the paint. Although it was rust-provided, there was a problem in durability and there was a problem that repainting was required in about 5 to 7 years. On the other hand, in anti-corrosion coating materials such as Petratum, the thickness of the coating layer is considerably thick,
In particular, when it is applied to a water pipe bridge or the like, not only is the appearance aesthetically impaired, but there is a problem that a large weight load is applied. Furthermore, if water leakage occurs due to local corrosion of the distribution pipe, water runs inside the anticorrosion coating and flows out to the outside at a location away from the leakage location, which makes it difficult to identify the leakage location and detect it early. However, there was also a problem that it was difficult to perform maintenance management.

On the other hand, as an anticorrosion paint which is a further improvement over the conventional rust preventive paint, as described in Japanese Patent Publication No. 56-43267, the main component of Portland cement powder or its chemical composition as an additive to a solvent type paint. A so-called ceramic anticorrosion paint with improved anticorrosion properties and improved protection performance has been developed by incorporating calcium oxide powder, which is a component, and utilizing the alkalinization of paints with these additives, and has been frequently used recently. Has been done.

[0005]

The above-mentioned anticorrosive paint exhibits excellent adhesive strength by the synergistic effect of the binder component of the base paint and the inorganic binding effect of the additive, and the anticorrosive property of the alkaline component, Although it is also excellent in weather resistance and water resistance, the following problems still remain in the anticorrosion coating with the paint alone.

That is, since a relatively large amount of cement-based powder is mixed as an additive in a solvent type paint, fine pinholes are more likely to occur in the coating film as compared with general paints, especially in thin coating films. Since the environment is cut off, there is a high possibility that spot rust will occur due to incomplete barrier properties. Therefore, as a countermeasure, it is considered to increase the coating thickness by overcoating or thick coating to improve the barrier property, but since the so-called elongation is worse than the general paint due to the inclusion of the cementitious powder, When coating by brush coating, roller coating, etc., there is a drawback that coating unevenness is likely to occur and the aesthetic appearance is likely to be impaired.

In view of the above-mentioned technical background, the present invention utilizes the various characteristics of the above-mentioned anticorrosion coating compounded with cement-based powder as an additive, while further improving the drawbacks thereof, and an anticorrosion coating structure and the anticorrosion coating. It is an object of the present invention to provide a coating method for forming a film.

Therefore, in the present invention, the "cement-based powder" means the additive described in Japanese Patent Publication No. 56-43267, that is, Portland cement powder, and calcium oxide powder which is the main component in its chemical composition. And a mixture of calcium oxide powder and other chemical composition powders (silicon dioxide, aluminum oxide, ferric oxide, magnesium oxide, etc.).

[0009]

The present invention provides an excellent protection performance of the above-mentioned anticorrosion paint by compounding an anticorrosion paint in which a cement-based powder is mixed with a solvent-type paint and a tensile fiber cloth such as glass cloth. That is, it is possible to improve impact resistance and coating strength while maintaining corrosion resistance, salt water resistance, water resistance, weather resistance, etc. as it is, and to further improve durability. By gradually reducing the content of the cement-based powder component in each coating layer of the top coat, the coating workability is improved and the appearance is excellent while sufficiently retaining the above-mentioned protective performance. It was completed based on new knowledge of what can be done.

That is, one aspect of the present invention relates to an anticorrosion coating structure for water pipes and the like, and relates to an undercoat layer comprising an anticorrosion coating prepared by mixing a cement-based powder as an additive with a solvent-based coating, and winding it on the outer surface thereof. A coated tensile fiber cloth layer, an intermediate coat layer made of the same anticorrosive paint impregnated and coated on the fiber cloth layer, and the same anticorrosion formed by coating on the intermediate coat layer. and the topcoat coating layer made of solvent-paints not blended paint or cement-based powder consists with <br/>, and the intermediate coat layer and the topcoat coating layer subbing coat layer and intermediate coat layer of each of the lower On the other hand, the content of cement-based powder is set to be relatively low.

Further, another invention relates to an anticorrosion coating method for forming the above anticorrosion coating structure, which comprises a pretreatment step for cleaning the surface of an anticorrosion coating object such as a water pipe and a solvent type paint. An undercoating step of applying an undercoating anticorrosive paint containing a cement-based powder as an additive to form an undercoating coat layer of a predetermined thickness, and then, on the above-mentioned undercoating coat layer, an anticorrosion paint similar to the above-mentioned undercoating anticorrosion paint An intermediate coating anticorrosive paint having a relatively small amount of cement-based powder than that of the paint is applied multiple times, and a tensile fiber cloth tape is spiraled while applying a predetermined tension during the applying process. An intermediate coating step of forming an intermediate coating layer in which the intermediate coating anticorrosive coating is impregnated and coated on the above-mentioned fiber cloth layer, and then further, the cement-based powder of the cement-based powder is further formed on the intermediate coating layer. Further than middle coating anticorrosive paint total amount it is characterized in more becomes possible and the topcoat forming a topcoat coating layer by coating a top coating containing no topcoat anticorrosive paint or cementitious powder was small.

[0012]

DETAILED DESCRIPTION OF THE STRUCTURE Solvent-based paints, which are the base of the anticorrosion paint of the present invention, are commercially available solvent-based synthetic resin paints such as vinyl chloride paints, acrylic paints, silicone paints, fluororesin paints. Etc. are widely applicable, and oil-based paints can also be used. As will be described later, a vinyl chloride paint is preferably used for the undercoat, and an acrylic paint is used for the middle coat and the top coat. These paints may be used as they are on the market, but from the viewpoint of coating workability, it is preferable to use them after diluting them with a solvent such as thinner to about 10 to 30%.

The cement-based powder used as an additive in the anticorrosion paint contains Portland cement powder, calcium oxide powder, etc. as described above, but it is preferable to use white Portland cement powder. That is,
The use of white Portland cement powder is advantageous in that it is excellent in the effect of suppressing rusting and can improve the protection performance while ensuring the freedom of the toning of the paint.

As the tensile fiber cloth impregnated with the intermediate coating anticorrosive paint, any fiber having a high Young's modulus can be applied, and inorganic fibers such as glass fiber cloth, metal fiber cloth and carbon fiber cloth can be used. In addition to cloth, it is also possible to use organic fiber cloth such as aromatic polyamide fiber cloth and polyimide fiber cloth. However, the fiber cloth is capable of finishing the coating surface smoothly without impeding the uniformity of the thickness of the anticorrosion coating, that impregnation of the anticorrosion coating is excellent, and excellent in strength, It is most preferable to use a thin glass fiber cloth in view of various requirements such as availability as cheaply as possible. That is, the thickness is 0.01 to 1.0 mm, preferably 0.1 to 0.2 mm, and the warp and weft density is 15 to 25 yarns / 25.
It is preferable to use a glass fiber cloth having a plain weave structure of mm. The cloth is used as one having improved adhesion by being subjected to heat cleaning or surface treatment with a silane coupling agent.

In the anticorrosion coating structure shown in the attached drawings,
(1) Water pipe for anticorrosion coating, (2) Undercoat layer, (3) Tensile fiber cloth layer , (4) Intermediate coating
Ri coat layer, (5) shows a top coat coat layer.

A more specific structure of the above-mentioned anticorrosion structure will be described in detail below together with its coating method.

[Pretreatment Step] The surface of the anticorrosion coated object (1) such as a water pipe is first cleaned by a pretreatment step. In the pretreatment step, rust on the surface is thoroughly scraped with a scraper, a Keren hammer, etc., and then the surface is polished with a wire buff sander, etc., and further adhered to the surface with a solvent such as thinner. Completely remove the oil, water, and deposits that are present. Further, if necessary, the exposed surface of rust is fixed by rust, and the welded portion, the pitted portion, etc. are locally treated to prevent water leakage.

[Undercoating Step] Next, the undercoating anticorrosive paint is applied one or more times to form an undercoating layer (2) having a predetermined thickness. For the undercoating anticorrosive paint used in this undercoating process, it is preferable to use a vinyl chloride-based paint as the base paint. That is, in comparison with the case of using acrylic paint, chlorinated rubber paint, etc., vinyl chloride paint forms a coating film of a required thickness without causing dripping or coating unevenness in painting work such as brush coating or roller coating. It is advantageous in terms of workability because it is easy and can be dried in a short time.

The amount of the cement-based powder compounded in the undercoating anticorrosive paint is 20 to 300 parts by weight, preferably 60 to 150 parts by weight, based on 100 parts by weight of the solid component of the solvent-based paint as the base, that is, the nonvolatile component. Set to a degree. When the blending amount is too small, less than 20 parts by weight, the blending effect of the cement-based powder, that is, the effect of sufficiently improving the anticorrosion performance,
The effect of improving the coating strength including adhesiveness and impact resistance cannot be sufficiently achieved. On the other hand, when the amount is too much over 300 parts by weight, even if the paint is diluted, the coating workability becomes poor and the barrier property of the coating is deteriorated, so that the desired protective performance cannot be achieved.
As described above, white Portland cement can be preferably used as the cement-based powder, and the undercoating anticorrosive paint containing this is preferably colored white.

The coating amount of the undercoating anticorrosive paint in the undercoating step is set to about 250 to 400 g / m 2 in one unit coating step, and 500 to 1000 g / m 2, particularly 700 to 1000 g by repeating this unit coating step 2 to 3 times. 800 g / m
It is preferably about 2. The thickness of the undercoat coat layer (2) thus formed is about 100 to 300 μm, preferably about 150 to 200 μm.

Since the undercoat layer (2) is formed by the anticorrosive paint containing a relatively large amount of the solvent-based paint cement-based powder as described above, the adhesive power of the base paint and the cement-based paint are obtained. With the inorganic binding effect of the powder, a strong adhesive force is exhibited on the surface of the anticorrosion coating target (1), and an excellent anticorrosion protection effect is exhibited due to the alkalinization tendency due to the inclusion of the cement-based powder.

[Intermediate coating step] Next, an intermediate coating anticorrosive coating is applied onto the undercoat coating layer (2), and before or before the intermediate coating step, a tensile fiber cloth is applied. By performing the winding coating, the intermediate coating layer (3) in which the tensile coating fiber cloth layer (3) is uniformly impregnated and coated with the intermediate coating anticorrosive paint is formed.

As the intermediate coating anticorrosive paint, an anticorrosive paint of the same quality is used in which the amount of the cement-based powder is relatively small in comparison with the above-mentioned undercoat anticorrosive paint. Here, the content of the cement-based powder is set to be relatively small so that the tensile fiber cloth layer (3) can be easily impregnated with the anticorrosive paint and a sufficiently strong coat layer can be formed. The purpose is to prevent the occurrence of pinholes in the intermediate coating layer (3), improve the barrier performance of the coating, and further facilitate the coating operation. Therefore, the blending amount of the cementitious powder in the intermediate coating anticorrosive paint is about 20 to 80 parts by weight, preferably about 40 to 60 parts by weight, relative to 100 parts by weight of the non-volatile components of the solvent-based paint. When the amount of the cement-based powder is too small, less than 20 parts by weight, it is not enough to enjoy the effect of the mixture, and when it exceeds 80 parts by weight, it is sufficient for the above requirements. I can't get satisfaction.

For the solvent type paint as the base paint of the intermediate coating anticorrosion paint, it is preferable to use a commercially available acrylic paint diluted with a dilution ratio of about 10 to 30%. That is, it is also possible to use a vinyl chloride-based paint similar to the undercoating anticorrosive paint, which is also included in the scope of the present invention, but the acrylic-based paint is more preferable than the case where the vinyl chloride-based paint is used. This is advantageous in that the tensile fiber cloth is satisfactorily impregnated, pinholes are less likely to occur, and coating with even coating is easy.

Further, it is preferable to use an intermediate anticorrosive paint having a color different from that of the undercoat anticorrosive paint, for example, one colored in gray. As a result, when the anticorrosion coating is locally damaged due to an external impact or the like, the occurrence state, the extent and the depth of the damage are as follows: the white color of the undercoat coat layer (2) and the gray color of the intermediate coat layer ( 4 ). Due to the difference in color, it is possible to easily detect and determine from the outside, which is advantageous for maintenance.

In the intermediate coating step, the tensile fiber cloth layer (3) is preliminarily wound on the undercoat layer (2), and then the intermediate coating anticorrosive paint is preferably applied to the unit coating step a plurality of times. Although it may be carried out separately in the form of multiple coating, in order to sufficiently impregnate the fiber cloth with the coating material, the first unit coating step with the intermediate coating anticorrosive coating material on the undercoat layer (2) in advance. Then, immediately after this is wound and coated with a fiber cloth while it is not dried and cured yet, one or more intermediate coating unit coating steps are further carried out on the cloth layer (3). It is preferable that

Further, it is recommended that the intermediate coating step be carried out while the undercoat layer (2) is in a dry-to-touch state where at least the surface portion has not been sufficiently dried and cured.
That is, when the undercoat coat layer (2) is dry to the touch, by tension winding the fiber cloth, the undercoat coat layer (2) is tightened with the fiber cloth to eliminate irregularities on the surface and average the thickness. It is useful in that it helps improve the appearance of the anticorrosion coating and can eliminate the pinholes in the undercoat layer (2) to improve the barrier performance. As the tensile fiber cloth used in the intermediate coating step, it is most preferable to use glass cloth as described above. For the glass cloth, for example, a tape having a width of about 150 to 200 mm is used, and the glass cloth is spirally wound at a lapping rate of about 50 to 60% so that one side edge portion is overlapped. At this time, it is necessary to wrap it while applying tension as evenly as possible.

The coating amount of the intermediate coating anticorrosive paint in the intermediate coating process is 250 to 500 g / m 2 per unit coating process.
By repeating this for 2 to 3 times, 800 to 1500 g / m @ 2, especially 900 to 1200 g
It is preferably about / m2. The thickness of the intermediate coat layer (4) formed by this, including the thickness of the tensile fiber cloth layer (3) is 300 to 800 μm, particularly 400.
The thickness is about 500 μm.

Since the intermediate coat layer (4) is formed of an anticorrosive paint containing cement-based powder, it exhibits the same excellent anticorrosive effect as described above, and the tensile fiber cloth layer (3). Is inherently present and is impregnated with the above-mentioned paint, which improves the strength of the coating, especially the impact resistance and stress absorption characteristics, and prevents damage to the coating due to external impacts and improves durability. improves. At the same time, as will be described later, it will be easier to identify the location of water leakage from the water distribution pipe, and this will provide an advantage in maintenance management.

[Topcoating Step] Next, the topcoating layer (4) is further coated on the intermediate coating layer (4) to form a topcoating layer (5).

The coating used in this top coating process may be an anticorrosive coating containing the same cement-based powder as described above. However, in the case where a high appearance aesthetic is required for the anticorrosion coating, the cement-based coating is used. A solvent-type paint containing no powder may be diluted at an appropriate dilution ratio (10 to 20%).
Even when the cement-based powder is blended, if it is contained in a large amount, it adversely affects the surface aesthetics of the outer coating layer (5). The amount is preferably 30 parts by weight or less, and more preferably 10 parts by weight or less, relative to 100 parts by weight of the sexual component.

It is preferable to use an acrylic paint as the base paint of the top anticorrosion paint or the top paint not containing cement powder. That is, the acrylic paint is not only excellent in coating workability as compared with the vinyl chloride-based paint, but also has excellent weather resistance and excellent coating film strength, and other possible silicone-based paints. Although it is a little inferior in terms of coating film aesthetics and stain resistance, etc., compared to other fluororesin-based paints, it is based on the fact that it is relatively inexpensive and therefore relatively superior.

The coating amount of the coating used in the top coating process is 20
0-800 g / m 2, preferably 300-500 g / m
2 and the thickness of the overcoat layer (5) formed thereby is 30 to 100 μm, preferably 4
It is preferable that the thickness is about 0 to 70 μm.

Since the overcoat layer (5) has a function of imparting an aesthetic appearance to the anticorrosion coating as described above, it is colored in an arbitrary color in harmony with the surrounding environment. Naturally, this coloring is based on the intermediate coating layer (4)
It is desirable to make it possible to easily visually inspect the damage state of the overcoat layer (5) by selecting a different color from the above.

The anticorrosion coating according to the present invention has a total total thickness of 0.5 mm or more, particularly preferably 0, including the undercoat layer (2), the intermediate coat layer (4) and the overcoat layer (5). It is better to set it in the range of 0.6 to 1.0 mm. If it is less than 0.5 mm, it is feared that the protection effect of the anticorrosion coating target may be insufficient, while 1.
Even if it is formed thicker than 0 mm, the protective effect does not increase remarkably, and rather the disadvantage that increases the material cost, the construction work cost and the weight load on the water distribution pipe and the like is prioritized.

[0036]

EFFECTS OF THE INVENTION According to the present invention, in comparison with various conventional anticorrosion coatings, in the anticorrosion effect for the anticorrosion coating object such as water pipe, the adhesive force, the protective effect such as impact resistance of the coating itself, and the durability performance. It can provide a much better anticorrosion coating. These effects are that at least the undercoat layer and the intermediate coat layer are used anticorrosion coating compounded with cement-based powder, and the intermediate coating layer is a tensile fiber cloth layer impregnated with the above coating composition. This is realized by being provided so as to absorb and relax the stress due to the impact from the outside and the expansion and contraction of the object to be coated on the inside, and to prevent the destruction of all layers of the coating.

In addition, at least the intermediate coat layer is smaller than the undercoat layer in terms of the content of the cement-based powder, so that the undercoat layer ensures a sufficient anticorrosion effect and adhesive strength. In the intermediate coat layer, the fiber cloth layer is sufficiently impregnated with the coating material to improve the strength of the coating, and the above effect can be further promoted, and the top coat layer can also improve the appearance. .

Furthermore, it is possible to identify the location of occurrence of water leakage or local rusting of the object to be coated by visual observation. That is, in the anticorrosion coating according to the present invention, when water leaks from the water pipe or the like, water leaks out on the anticorrosion coating in the vicinity of the leakage point, so that the location of the leakage point and its early detection can be performed. It is advantageous in terms of maintenance management. The reason why water leaks to the outside in the vicinity of such a leaking point cannot be fully clarified yet, but due to the internal of the tensile fiber cloth layer, the thickness of the coating in the area where the fiber exists The breaking strength in the direction is smaller than that in the weave, and microscopic strengths are mixed. It is speculated that this is due to the outflow.

Therefore, according to the present invention, it is possible to provide an anticorrosion coating excellent in various properties such as anticorrosion, aesthetics and maintenance.

[0040]

【Example】

 Example 1 The following materials were used as the constituent material of the anticorrosion coating.

(1) Undercoating anticorrosive paint A vinyl chloride paint (about 45% by weight of nonvolatile components) was mixed with 40% by weight of white Portland cement powder (about 88% by weight based on the nonvolatile components). White anticorrosive paint diluted with solvent (thinner) to about 10-30%.

(2) Intermediate coating anticorrosive paint An acrylic paint (about 45% by weight of nonvolatile components) was mixed with 20% by weight of white Portland cement powder (about 44% by weight based on the nonvolatile components). , With solvent 1
Gray anticorrosive paint diluted 0-20%.

(3) Topcoat anticorrosive paint An acrylic paint (about 45% by weight of nonvolatile components) was mixed with 5% by weight of white Portland cement powder (about 11% by weight based on the nonvolatile components), 10 with solvent
Ivory anticorrosion paint diluted to ~ 20%.

(4) Tensile fiber cloth Thickness 0.14 mm, width 160 mm, warp / weft density 19 yarns ×
Plain weave glass cloth tape 22 present / 25 m m.

A steel plate was used as the object of anticorrosion coating, the surface was cleaned by polishing and wiping with thinner, and then the above-mentioned undercoat paint was divided into two parts and the total amount of coating was 700 g.
It was applied by brush coating at a ratio of / m2 to form an undercoat layer.

While the surface portion of the undercoat layer is still dry to the touch, an intermediate coating (dilution ratio 10
%) Was uniformly applied by brush coating at a coating amount of 300 g / m @ 2, and immediately thereafter, the glass cloth tape was spirally wound at a wrap rate of 55% and overlapped while applying a predetermined tension.

Then, the above-mentioned intermediate coating material was further divided into two portions on the glass fiber cloth layer, and the coating amount was 700 g / m 2.
It was applied to No. 2 and left for 4 hours after the final intermediate coating unit coating step to form an intermediate coating layer containing a glass fiber cloth layer.

Further, the above-mentioned topcoat anticorrosive coating material is divided into two portions on the above-mentioned intermediate coating layer and the total coating amount is 360 g / m 2.
2 was applied by brush coating to form an overcoat layer, which was dried to complete the anticorrosion coating.

The anticorrosion coating thus obtained has an undercoat layer of 150 to 200 μm and an intermediate coat layer (including a glass fiber cloth layer) of 400 to 500 μ in the thickness of each coating layer.
m, the top coat layer was 50 μm, and the total thickness of the entire coating was about 700 μm (0.7 mm) on average.

Example 2 An anticorrosive coating was formed in the same manner as in Example 1 except that an acrylic paint (dilution rate 10%) containing no cement-based powder was used as the topcoat paint.

Comparative Example 1 The undercoating anticorrosive paint of Example 1 (Portland Cement 40
A vinyl chloride-based coating material containing 1% by weight) was used alone to form a 170 μm-thick anticorrosion coating on the steel sheet by three repeated coatings.

Comparative Example 2 Acrylic paint was mixed with 20 parts of white Portland cement powder.
Using an anticorrosive paint blended in a weight percentage, this is overcoated three times on a steel plate to form a main coat layer with a thickness of 180 μm, and then an acrylic paint (dilution rate 10%) alone
The coating was applied once to form an anticorrosion coating having a total thickness of 230 μm.

[Comparison Evaluation] In order to compare the performances of the anticorrosion coatings of Examples 1 and 2 and Comparative Examples 1 and 2 described above, an impact resistance test and a salt spray test were conducted by a test method according to JIS K-5400. , Adhesion test (Kkenken type adhesion test)
Was carried out and the results are shown in Table 1. In addition, the appearance of each coating was visually observed and compared, and the relative superiority or inferiority of the aesthetics was evaluated by ◎: particularly excellent, ○: excellent, Δ: slightly inferior, and shown in Table 1. I also wrote it down.

[0054]

[Table 1] In view of the results in Table 1 above, the anticorrosion coating according to the present invention has excellent protection performance and durability, and at least 15 judging from the durability record of the conventional anticorrosion paint shown in Comparative Example 1.
It is estimated to have a useful life of more than one year.

[Brief description of drawings]

FIG. 1 is a fragmentary side view showing an embodiment of an anticorrosion coating according to the present invention.

FIG. 2 is a sectional view showing details of the structure of the anticorrosion coating.

[Explanation of symbols]

 (1) ... Anticorrosion coating target (2) ... Undercoat coat layer (3) ... Tensile fiber cloth layer (4) ... Intermediate coat layer (5) ... Topcoat coat layer

Claims (9)

[Claims] 1. An undercoat layer comprising an anticorrosive paint prepared by mixing cement-based powder as an additive with a solvent-type paint,
A tensile fiber cloth layer wound on the outer surface thereof, an intermediate coat layer made of the same anticorrosive paint impregnated and coated on the fiber cloth layer, and further formed by coating on the intermediate coat layer. wherein the <br/> configured with a topcoat coating layer made of solvent-paints not blended similar anticorrosive paint or cement-based powder, and the intermediate coat layer and the topcoat coating layer subbing coat layer of each of the lower and And an anticorrosion coating structure for a water pipe, characterized in that the content of cement-based powder is set relatively low with respect to the intermediate coating layer. 2. The water pipe according to claim 1, wherein the base coat of the undercoat coat layer is made of vinyl chloride paint, and the base coat of the intermediate coat layer and the top coat layer is made of acrylic paint. Anticorrosion coating structure such as. 3. The anticorrosion coating structure for a water pipe or the like according to claim 1, wherein the tensile fiber cloth layer is made of glass cloth. 4. The undercoat layer comprises 20 to 30 cement powders based on 100 parts by weight of non-volatile components of the solvent-based paint.
4. The coating composition according to claim 1, wherein the intermediate coating layer contains 0 to 30 parts by weight, the intermediate coating layer contains 20 to 80 parts by weight of the cement-based powder, and the upper coating layer contains 0 to 30 parts by weight of the cement-based powder. Anti-corrosion coating structure for water pipes, etc. 5. The anticorrosion coating structure for a water pipe or the like according to claim 1, wherein at least the undercoat coat layer is colored differently from each other with respect to the intermediate coat layer and the top coat layer. . 6. Regarding the thickness of each coat layer, the undercoat coat layer is 100 to 300 μm, the intermediate coat layer including the fiber cloth layer is 300 to 800 μm, and the top coat layer is 30.
The anticorrosion coating structure for a water pipe or the like according to any one of claims 1 to 5, wherein the anticorrosion coating structure is formed in the range of 100 to 100 m. 7. A pretreatment step for cleaning the surface of an anticorrosion coated object such as a water pipe, and an undercoat anticorrosive paint prepared by mixing a cement-based powder as an additive with a solvent-based paint to form an undercoat of a predetermined thickness. An undercoating step of forming a coat layer, and then, on the undercoating coat layer, a plurality of intermediate coating anticorrosive paints, which are the same anticorrosive paints and have a relatively small amount of cement-based powder than the undercoating anticorrosive paint. The intermediate cloth anticorrosive paint was impregnated and coated on the above-mentioned fiber cloth layer by coating the fiber cloth layer for a number of times and winding the tensile strength fiber cloth tape spirally while applying a predetermined tension during the coating process. An intermediate coating step of forming an intermediate coating layer, and then further containing a top coating anticorrosive paint or cement type powder on the intermediate coating layer, wherein the blending amount of the cement-based powder is smaller than that of the intermediate coating anticorrosive coating. An anticorrosion coating method for water pipes and the like, which comprises an overcoating step of forming an overcoat layer by applying an overcoat paint that does not have it. 8. The anticorrosion coating method for a water pipe or the like according to claim 7, wherein the intermediate coating step is performed when at least the surface portion of the undercoat coating layer is in a touch-free state. 9. The undercoating anticorrosive paint is 500 to 1000 g.
/ M2, 800 ~ 15 for intermediate anticorrosion paint
The anticorrosion coating method for a water pipe or the like according to claim 7 or 8, wherein the top coat anticorrosive paint or the top coat paint is applied at a rate of 200 to 800 g / m2.