JPH076206B2 - Cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cover for a manhole in an underground buried pipeline such as water and sewage, electric wiring, gas piping, and a telephone line, or a cover for a drain such as a drain gutter. The present invention relates to a cover lid arranged on a road surface such as a lid. The present invention also relates to a colored cover lid which is excellent in corrosion resistance, wear resistance, surface friction and has high aesthetics.

(Prior art) Manhole cover lids for underground buried pipelines such as water and sewage systems, electric wiring, gas pipes, and telephone lines have conventionally been cast iron with black tar epoxy resin paint and concrete. The cover made of steel plate or concrete is generally used as the cover cover of the drainage road gutter, but among these cover covers made of concrete are generally used. The ones are complicated because they require a hardening process of concrete at the time of construction, and so-called iron lids such as cast iron or steel plates are predominant from the viewpoint of simplicity of construction. However, the iron lid has excellent characteristics in terms of easiness of construction, strength and abrasion resistance as described above, but has a drawback that the surface is slippery. For this reason, the surface of the iron lid is usually provided with an uneven pattern to prevent slippage, but it does not provide sufficient effect, and the uneven surface is worn out in a short period of time in places where people or vehicles come and go frequently. However, especially in rainy weather, a lot of pedestrians' falls or vehicle slip accidents occur, which is a problem.

By the way, in recent years, from the tendency of beautification and fashion of the urban environment, a technique for coloring such a cover lid has been studied. For example, at present, the one in which the surface of the iron lid is coated with a colored epoxy resin-based paint and the one in which the surface recess of the iron lid is filled with a colored resin have been developed and partially commercialized.

However, resin paint-coated products have low coating hardness and weak adhesion between the coating and the iron lid base material, so the coating may wear or peel off in a short period of time when a person or vehicle passes by. However, a large amount of maintenance cost is required for repainting, and resin-filled products are also exposed to sunlight for a long time, so fading due to ultraviolet rays is observed and the initial color of the construction is maintained for a long time. It had a drawback that it could not be done. Further, in the iron lid with such a color, the requirement from the functional aspect such as the above-mentioned slipperiness is not considered at all, and in particular, the resin paint-coated article has a very slippery surface, which is a safety factor. It was a problem from the aspect.

Further, in the example of Japanese Utility Model Publication No. 62-16149, a manhole cover is disclosed in which a ceramic sprayed coating is formed on the entire surface of a main body made of cast iron for the purpose of improving corrosion resistance and wear resistance. For example, it is considered possible to apply coloring by forming such a ceramic sprayed layer from colored ceramics. However, when the ceramic sprayed layer is directly formed on the surface of the cast iron base material as described above, the adhesion between the ceramic coating and the cast iron base material is not sufficient, and the coating is likely to be peeled off. Furthermore, the ceramic sprayed layer has a considerable number of pores, and rainwater penetrates through the pores to oxidize the cast iron base material, causing separation from the coating boundary, and not only improving corrosion resistance is not expected. However, the red rust generated on the surface of the cast iron base material comes out on the surface of the ceramic sprayed layer, which is detrimental to the appearance.

(Problems to be Solved by the Invention) Therefore, an object of the present invention is to provide a novel cover lid. Another object of the present invention is to provide a cover lid having excellent corrosion resistance and wear resistance and high surface friction. A further object of the present invention is to provide a cover lid that can maintain the color tone at the initial stage of construction for a long period of time when it is colored. Another object of the present invention is to provide a cover lid capable of promoting beautification of the urban environment.

(Means for Solving the Problems) The above-mentioned various objects are a cover lid arranged on a road surface having an uneven upper surface, and the upper surface is entirely covered on the surface of the uneven iron-based base material. A corrosion-resistant metal sprayed layer is formed over the entire surface, a ceramics sprayed layer is formed on the corrosion-resistant metal sprayed layer at least in the convex portion, and further, a sealing treatment is applied by a resin-based sealing material over the entire layer thickness. This is achieved by a cover lid characterized in that a dendritic coating layer of 5 to 100 μm is formed.

(Operation) As described above, in the cover lid of the present invention, the corrosion-resistant metal sprayed layer is formed on the entire surface of the iron-based base material on the upper surface having the unevenness, and the corrosion-resistant metal sprayed layer is formed at least in the convex portion. A ceramic sprayed layer is formed on the layer, and a resin coating layer having a layer thickness of 5 to 100 μm is formed by performing a sealing treatment with a resin-based sealing material over the entire layer. That is, in the cover lid of the present invention, the convex portion on the upper surface has a structure in which a corrosion-resistant metal sprayed layer and a ceramic sprayed layer sealed by a resin-based sealing material are sequentially laminated on the iron-based base material. Also, the upper surface concave portion has the same structure as this, or has a structure in which a corrosion-resistant metal sprayed layer subjected to a sealing treatment with a resin-based sealing material is formed on an iron-based base material.

In general, a metal sprayed layer has a very small number of pores because the viscosity of metal is lower than that of ceramics when sprayed, and the surface of the base metal can be closely covered. The corrosion-resistant metal sprayed layer formed on the surface of the base material has high adhesion at the bonding interface with the iron-based base material,
Even when an impact force or vibration is applied, it is extremely unlikely that a dropout such as peeling will occur. Further, if such a metal sprayed layer is sealed with a resin-based sealing material, even a very small number of pores existing in the corrosion-resistant metal sprayed layer will be blocked, so that the resin-based sealing material is used for sealing. The corrosion-resistant metal sprayed layer is substantially completely non-porous. Therefore, when the corrosion-resistant metal sprayed layer that has been subjected to the sealing treatment with the resin-based sealing material is formed, the iron-based base material is not exposed to the external environment, and extremely excellent corrosion resistance can be obtained.

Even in the upper surface of the cover lid that becomes the road surface, in the concave portion where contact with a passing body such as a person or a vehicle is relatively small, it is composed of the corrosion-resistant metal sprayed layer that has been sealed with the resin-based sealing material as described above. This is sufficient, but when it is placed on the road surface, the projections that are the main contact parts with people or vehicles such as vehicles have corrosion resistance as well as appropriate surface friction and wear resistance. Needed.

Ceramics is a material having high wear resistance. Further, as a result of earnest studies by the present inventors, the ceramic sprayed layer generally has a surface roughness of R _max 40 to 60 μm, but this roughness is appropriate on the road surface. It was found to bring about slip resistance. Therefore, covering the surface of the iron-based base material with the ceramic sprayed layer is extremely effective in imparting the appropriate surface friction property required for the cover lid for a long period of time,
As described above, when the ceramic sprayed layer is formed directly on the iron-based base material, the adhesion is weak and defects such as peeling are likely to occur,
Further, since the ceramic sprayed layer has considerable pores, corrosion resistance cannot be expected. However, when the ceramics sprayed layer is brought into close contact with the iron-based base material via the corrosion-resistant metal sprayed layer as described above, the ceramics sprayed layer is sufficiently firmly held by the iron-based base material. Further, when such a ceramic sprayed layer is sealed with a resin-based sealing material, it is possible to close the pores present in the ceramic sprayed layer without changing the appropriate surface roughness as described above. Synergistic with the provided dense corrosion-resistant metal sprayed layer, the surface of the iron-based base material is sufficiently protected, the iron-based base material is not exposed to the external environment, and sealing is performed with a resin-based sealing material. As in the case of forming the above-mentioned corrosion-resistant metal sprayed layer, extremely excellent corrosion resistance is obtained, and the characteristics required for the upper surface convex portion are satisfied.

Furthermore, in the cover lid of the present invention, the outermost layer on the upper surface is the one that has been subjected to a sealing treatment with a resin-based sealing material, and since it is substantially non-porous, rainwater, dust, etc. There is little risk of contamination due to intrusion, and as described above, since the iron-based base material is completely covered with a film and has good corrosion resistance, red rust does not rise from the iron-based base material.
Furthermore, both ceramics and corrosion-resistant metal are chemically very stable, and as described above, the ceramic sprayed layer has excellent wear resistance even in the convex portion, and is unlikely to cause defects such as peeling, thus preventing corrosion in the concave portion. The metal sprayed layer is also less likely to suffer defects such as wear and peeling. For this reason, the resin-based sealing material is made of a transparent material, and is covered with the color of the ceramic sprayed layer composed of monochromatic or multicolored ceramics or the color of the corrosion-resistant metal sprayed layer and the top of the lid. When the surface is colored, it can be maintained for a long time without changing the color tone at the beginning of construction even in a severe road surface environment.

Hereinafter, the present invention will be described in more detail based on embodiments.

The cover lid of the present invention is a cover lid arranged on a road surface,
For example, cover covers for manholes in underground buried pipelines such as water and sewage, electric wiring, gas pipes, telephone lines, etc., cover covers for road surfaces such as cover covers for drainage gutters, etc. are included. .

FIG. 1 is a cross-sectional view schematically showing the structure of a manhole cover which is one embodiment of the cover lid of the present invention.

In the manhole cover of this embodiment, a corrosion-resistant metal sprayed layer 2 is formed on the entire surface of the cast iron base material 1 having an uneven pattern on the upper surface 5, and the corrosion-resistant metal sprayed layer 2 is formed on the corrosion-resistant metal sprayed layer 2. Further, a monochromatic ceramic sprayed layer 3 is formed over the entire surface, and a resin coating layer 4 made of a transparent resin-based sealing material is formed over the entire surface for sealing processing. Therefore, in the upper surface 5 of the manhole cover, the corrosion-resistant metal sprayed layer 2, the ceramic sprayed layer 3, and the resin coating layer 4 are sequentially laminated on the surface of the cast iron base material 1 in both the convex portion 8 and the concave portion 9. It has a structure.

In this manhole cover, the corrosion-resistant metal sprayed layer 2 is formed on the entire surface of the cast iron base material 1 even on the lower surface 6 and the peripheral side surface 7, and the resin-based sealing material is formed over the entire surface. The resin coating layer 4 is formed to protect the surface of the base material.

Further, FIG. 2 is a plan view schematically showing the construction of a gutter lid body which is another embodiment of the cover lid of the present invention, and FIG. 3 is a sectional view of the same embodiment.

In the gutter lid of this embodiment, the upper surface 15 thereof, the corrosion-resistant metal sprayed layer 12 is formed over the entire surface of the cast iron base material 11 on which the uneven pattern is formed, and further the projection 18 has the corrosion resistance. White ceramic sprayed layer on metal sprayed layer 12
13a and a gray ceramics sprayed layer 13b are formed, and a black ceramics sprayed layer 13c is formed in the concave portion 19, and a resin coating layer made of a transparent resin-based sealing material for sealing treatment is further formed on the entire surface. 14 are formed. In this gutter cover, the ceramic sprayed layers 13a, 13b, 13c composed of three kinds of colored ceramics are formed on the entire surface of the corrosion-resistant metal sprayed layer 12, and the sealing treatment is performed thereon. In order to use a transparent resin-based sealing material used in (3), the upper surface is colored with the ceramic sprayed layers 13a, 13b, 13c, and has a design effect.

Further, when it is intended to impart a design effect by coloring in this way, in the upper surface concave portion 19, slip resistance and wear resistance in contact with a passing body when arranged on the road surface does not cause a particular problem. In addition, for example, instead of the ceramic sprayed layer 13c in the above embodiment, it is possible to form a sprayed layer of a good color metal or a coating film of a resin-based paint on the corrosion-resistant metal sprayed layer. Applying a metal sprayed layer or a coating film of a resin-based paint to the recesses 19 further expands the color variation.

In addition, in FIGS. 1 to 3, corrosion-resistant metal sprayed layers 2, 12,
The thickness of the ceramic sprayed layers 3, 13a, 13b, 13c and the resin coating layers 4, 14 are exaggerated.

As in the embodiment shown in FIGS. 1 and 2-3, the cover lid of the present invention has an iron-based base material,
This satisfies the mechanical strength and the like originally required for the cover lid, and at the same time, it is preferable from the economical viewpoint. More specifically, as the iron-based base material, cast iron or a steel plate may be mentioned, for example, cast iron in a manhole cover lid, or cast iron or a steel plate as a gutter cover lid, etc., depending on its application. To be selected. Further, the upper surface of the iron-based base material is provided with a concavo-convex pattern in order to impart irregularities on the upper surface of the final product.

In the cover lid of the present invention, the upper surface of the iron-based base material having such an uneven pattern is first entirely covered with the corrosion-resistant metal sprayed layer. The corrosion-resistant metal sprayed layer can be formed on the surface of the iron-based base material by using a conventionally known metal spraying method, and if necessary, the surface of the iron-based base material is subjected to pretreatment such as degreasing and blasting. After that, it is formed by spraying a corrosion resistant metal in the form of a wire or powder using a spray gun or the like. The corrosion-resistant metal forming the corrosion-resistant metal sprayed layer specifically includes, for example, Al, Ni, Cr, Zn and alloys thereof, but from an economical viewpoint, Al or Al alloy, Ni. -Al alloy and Ni-Cr alloy are preferable. In addition,
When the corrosion-resistant metal sprayed layer is composed of an alloy system consisting of a plurality of metals, it is of course possible to spray wire rods or powders made of such alloys in advance, but it is also possible to mix powders of the respective constituent metals at the same time. Then, an alloy spray coating may be formed. Further, as the layer thickness of the corrosion-resistant metal sprayed layer,
Although not particularly limited, it is desired to be in the range of 50 to 300 μm, more preferably 100 to 200 μm. That is, if the layer thickness is less than 50 μm, the number of ventilation holes increases, and there is a possibility that sufficient anticorrosion effect may not be obtained. On the other hand, if the layer thickness exceeds 300 μm, there is a cost disadvantage. This is because there is a high possibility that it will become a problem.

Further, a ceramic sprayed layer is formed on the corrosion-resistant metal sprayed layer as in the embodiment shown in FIGS. 1 and 2 to 3 on at least the convex portion of the upper surface of the cover of the present invention. That is, even on the upper surface of the cover lid, the ceramic sprayed layer does not necessarily have to be formed in the recessed portion that has little contact with the passing body when it is applied to the road surface, as in the embodiment shown in FIG. The ceramic sprayed layer may be formed by spraying the corrosion-resistant metal sprayed layer by using a conventionally known ceramic spraying method such as a plasma git spraying method, but as in the embodiment shown in FIG. If there are portions (recesses) where the thermal sprayed layer is not formed, these areas may be masked prior to ceramic thermal spraying. Further, as in the embodiment shown in FIGS. 2 to 3, when forming a ceramic sprayed layer of a plurality of colors, first, as in the above, masking is applied to a portion other than a predetermined portion to perform ceramic spraying of one color. With respect to the ceramic sprayed layers of the remaining colors, this operation may be sequentially repeated to form ceramic sprayed layers of a plurality of colors. Although any of various is used as the ceramic constituting the ceramics sprayed layer, for example, when attempting to impart coloristic effects, Al ₂ O ₃ exhibiting white, Al ₂ O ₃ exhibiting a black color or gray
-TiO ₂ , blue Al ₂ O ₃ -Co, pale yellow ZrO ₂
Ceramics such as -Y ₂ O ₃ are preferably used. Also,
The layer thickness of the ceramic sprayed layer is not particularly limited, but is 100 to 300 μm, more preferably 150 to 200
It is desired to be in the μm range. That is, the layer thickness is 10
If it is less than 0 μm, the abrasion resistance will not be sufficient, and there is a possibility that appropriate surface roughness may not be obtained for a long period of time, while if the layer thickness exceeds 300 μm, This is because there is a high possibility that the cost will be disadvantageous.

In the cover lid of the present invention, the ceramic sprayed layer as described above, or the corrosion-resistant metal sprayed layer at the portion where the ceramic sprayed layer is not formed, is subjected to sealing treatment with a resin-based sealing material. This sealing treatment can be performed by applying a resin-based sealing material to the surface of the ceramic sprayed layer or the corrosion-resistant metal sprayed layer by a method such as brush coating, spray coating, or dip coating. When such a sealing treatment is performed, a film of a resin-based sealing material is formed on the ceramic sprayed layer or the corrosion-resistant metal sprayed layer as in the embodiment shown in FIG. 1 or FIGS. However, as long as the pores in the ceramic sprayed layer or the corrosion-resistant metal sprayed layer are closed by the resin-based sealing material, the coating of the resin-based sealing material is not particularly necessary. Even if the film of the sealing material is worn away by the contact with the passers at the convex portions, it is not a problem. Specific examples of such resin-based sealing material include vinyl chloride-based resin, acrylic resin,
Examples thereof include polyester resins, polyurethane resins, melamine resins, epoxy resins, silicone resins and polymer blends thereof. As described above, depending on the color of the ceramic sprayed layer or the ceramic sprayed layer and the corrosion resistant metal sprayed layer. When coloring the cover lid, it is necessary to use a transparent resin-based sealing material. Further, the resin coating layer formed on the ceramic sprayed layer or the corrosion-resistant metal sprayed layer as in the embodiment shown in FIG. 1 or FIGS. It is not particularly required as long as the pores in the sprayed layer or the corrosion resistant metal sprayed layer are closed by the resin-based sealing material, but the layer thickness is 5 to 100 μm, more preferably about 30 to 60 μm. It is desirable that it be done.

That is, if the layer thickness is less than 5 μm, the pores in the ceramic sprayed layer or the corrosion-resistant metal sprayed layer may not be sufficiently blocked, while if the layer thickness exceeds 100 μm, the ceramic sprayed layer may Appropriate surface roughness on the applied upper surface, particularly on the upper surface convex portion, may be filled with the resin coating layer, and the covering lid may become relatively slippery at the initial stage of construction. This is because.

(Examples) Hereinafter, the present invention will be described more specifically with reference to Examples.

Example 1 After performing a blast treatment on the surface of a cast iron test piece substrate,
The nickel-aluminum powder was sprayed using a gas plasma gun to form a 200-μm thick nickel-aluminum sprayed layer. Subsequently, gray ceramics (gray alumina) was sprayed by a gas plasma gun to form a ceramic sprayed layer having a layer thickness of 150 μm on the nickel-aluminum sprayed layer. Further, for sealing treatment, a transparent epoxy resin prepolymer was applied and dried and cured to form an epoxy resin sealing film layer having a layer thickness of 60 μm. Under the following conditions for the obtained test piece,
The abrasion resistance, slip resistance value (BPN), stain resistance and adhesion of the coating were tested. The results are shown in Table 1.

Comparative Example 1 For comparison, a test piece substrate made of cast iron was coated with an epoxy resin (thickness: about 60 μm). The test pieces thus obtained were examined for abrasion resistance, slip resistance (BPN), stain resistance, and adhesion of the film in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 2 For comparison, a cast iron test piece substrate surface was blasted, and then gray ceramics (gray alumina) was sprayed by a gas plasma gun to form a ceramic sprayed layer with a layer thickness of 150 μm on the cast iron substrate surface. Was directly formed. With respect to the obtained test piece, abrasion resistance, slip resistance value (BPN), stain resistance and adhesion of the film were examined in the same manner as in Example 1. The results are shown in Table 1.

Abrasion test Using a ball-on-disk device, using a steel ball on each of the obtained test pieces, pressurization weight 3.0 Kg, rotation speed 70 rpm
And the average wear depth was measured.

Sliding resistance value (BPN) measurement test After the surface of the test piece was wet with water in advance, the sliding resistance value was measured using an English type portable skid resistance tester.

Staining Test Ink Staining: Black ink was applied to the surface of the test piece at a rate of 1 cc per 1 cm ² , washed with water after 5 minutes, and then the degree of stain remaining on the surface of the test piece was visually evaluated. The evaluation is
The evaluation was carried out by a four-level evaluation in which ⊚ is very good with almost no stain, ∘ is good without stain, Δ is mess with a slight amount of stain, and X is very much stain.

Rubber tire slip dirt: After rubbing the rubber tire fragment on the surface of the test piece by reciprocating 10 times with a load of about 10 kg,
It was washed with a scrubbing brush and then the degree of stain remaining on the surface of the test piece was visually evaluated. The evaluation was performed by the same four-level evaluation as above.

Muddy water stain: The surface of the test piece was sprayed with muddy water, and the degree of stain remaining on the surface of the test piece after washing with water was visually evaluated. The evaluation was performed by the same four-level evaluation as above.

Adhesion test A tensile test was carried out according to JIS H 8666 to examine the adhesion of the film formed on the substrate surface.

(Effects of the Invention) As described above, the cover lid of the present invention is a cover lid positioned on a road surface having an uneven upper surface, and the surface of the iron-based base material having the unevenness on the upper surface. A corrosion-resistant metal sprayed layer is formed over the entire surface, and a ceramics sprayed layer is formed on the corrosion-resistant metal sprayed layer at least in the convex portion, and a sealing treatment is performed with a resin-based sealing material over the entire surface. It is characterized by the fact that a resin coating layer with a layer thickness of 5 to 100 μm is formed, so it has high surface friction and good wear resistance, so it has high slippage when placed on the road surface. It has a protective effect over a long period of time, and when it is colored, it can maintain the initial color tone of the construction for a long period of time, and it is an excellent cover lid in terms of both functional and aesthetic aspects. Is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing the configuration of one embodiment of the cover lid of the present invention, and FIG. 2 is a plan view schematically showing the configuration of another embodiment of the cover lid of the present invention. FIG. 3 is a sectional view of the same embodiment. 1 …… Cast iron base material, 2,12 …… Corrosion resistant metal sprayed layer, 3,13a, 13
b, 13c …… ceramic sprayed layer, 4,14 …… resin coating layer,
5,15 …… Top surface, 6 …… Bottom surface, 7 …… Peripheral side surface, 8,18
…… Convex part, 9,19 …… Concave part, 11 …… Steel plate base metal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-110863 (JP, A) JP-A-60-186493 (JP, A) JP-A-58-217476 (JP, A) Actual development Sho-62- 120546 (JP, U) Japanese Patent Sho 61-41273 (JP, B2)

Claims (2)

[Claims] 1. A cover lid arranged on a road surface having an uneven upper surface, wherein a corrosion-resistant metal sprayed layer is formed on the entire surface of the uneven iron-based base material. , A ceramic sprayed layer is formed on the corrosion-resistant metal sprayed layer at least at the convex portion, and a sealing treatment with a resin-based sealing material is further applied over the ceramic sprayed layer to form a layer thickness 5
A cover having a resin coating layer of -100 μm formed thereon. 2. The cover according to claim 1, wherein the sprayed ceramics layer is made of colored ceramics of a single color or a plurality of colors, and a transparent resin-based sealing material is used as the resin-based sealing material. .