JP3949445B2 - Iron lid with anti-slip measures and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an iron lid having unevenness for preventing slip on the surface of a lid that closes an opening of an underground structure or the like, and a method for manufacturing the same.
[0002]
[Prior art]
The iron lid known as a lid closing the so-called manhole is provided with unevenness for preventing slipping, and various devices have been added to the form and structure of the unevenness. Some iron lids are colored iron lids with a color pattern added to the concave / convex pattern, which can be slippery and dangerous in situations where the recesses are filled or the colored resin surface is wet with rain. There is a problem that there is.
[0003]
On the other hand, there is an invention disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-140273 as a countermeasure that has been conventionally considered. This invention describes a method of adhering a hard aggregate to a binder such as a synthetic resin and adhering it to a casting surface. It is disclosed in (e). In the case of Utility Model Registration No. 3066083, an example is disclosed in which the aggregate in the filler filled on the lid surface has a non-slip effect.
[0004]
The inventions and devices described above were conceived and tested in research and development prior to this application. The problem here is that anti-slip materials such as aggregates will float on the surface of the resin, or will sink on the contrary and cannot be evenly dispersed in the target resin, and the effect will not be sustained. That is. Even when the anti-slip material is mixed and filled on the resin surface, it floats or sinks, causing a problem that it is not dispersed throughout the resin.
[0005]
[Problems to be solved by the invention]
This invention is made paying attention to the said point, The subject is providing the iron lid which can exhibit the slip prevention effect over a long period of time. Moreover, the other subject of this invention is providing the manufacturing method of said iron lid.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the iron lid subjected to the anti-slip measure of the present invention has at least two resin layers in the upper and lower sides, filled in the recesses in the irregularities on the lid surface, and has at least two resin layers. The granular anti-slip material is fixed and distributed almost uniformly on the upper layer of the layer, and the anti-slip material has a structure having a particle size larger than the layer thickness of the resin layer in which the anti-slip material is distributed .
[0007]
In the iron lid subjected to the anti-slip measure of the present invention, the concave portion in the concave and convex portions of the lid body is filled with the first resin with a layer thickness sufficiently shallower than the depth of the concave portion, and after the first resin is cured. The operation of filling and curing the second resin on the first resin is repeated to form at least two resin layers on the top and bottom, and at least before or after filling the first resin and the second resin , it is distributed. An anti-slip agent having a particle size larger than the layer thickness of the resin layer is sprayed, or a slip having a particle size larger than the layer thickness of the resin layer in which it is distributed in the first resin and the second resin. It is desirable to manufacture by a method in which the anti-slip agent is distributed almost uniformly in the resin layer by mixing and dispersing the inhibitor.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The iron lid according to the present invention is an iron lid that closes an opening of an underground structure or the like so as to be openable and closable, and the anti-slip effect of the iron lid having an anti-slip unevenness is impaired by the coloration of the iron lid. This is intended to maintain or improve the desired anti-slip effect. Therefore, although this iron lid is mainly a so-called color iron lid, a case where only the anti-slip measure is applied to the iron lid without aiming at colorization is also an object of the present invention.
[0009]
The iron lid according to the present invention has at least two resin layers in the upper and lower sides and is filled in the recesses in the recesses and projections on the surface of the lid, and the granular anti-slip material on the upper layer of the at least two resin layers Are distributed almost evenly. The unevenness | corrugation of the cover body surface is an unevenness | corrugation formed as a thing for slip prevention on the surface of a cover body, and the resin layer is fixed to the recessed part by filling. The resin layer is a means for dispersing and fixing the anti-slip material. Therefore, the colorization may be considered to be secondary, but the purpose of fixing and coloring the anti-slip material is achieved at the same time. Of course, it may be a thing from the meaning of invention.
[0010]
It is desirable that the anti-slip material has a particle size larger than the thickness of the resin layer in which it is distributed. This is because the slip preventing material always comes out of each resin layer.
[0011]
The anti-slip material may be dispersed in the upper layer of at least two resin layers. However, it goes without saying that anti-slip materials may be dispersed in both the upper and lower layers of at least two resin layers. It is desired that the substantially uniform dispersion is satisfactorily achieved in both the depth direction and the area of the entire resin layer composed of at least two layers.
[0012]
It is desirable that the resins constituting the at least two resin layers are of the same type or of a type having an affinity for each other. This is because the adhesion is kept good. The reason why at least two layers are required in the present invention is that the effect is lost immediately in the case of a single layer.
[0013]
Next, a manufacturing method is mentioned. The 1st example shown in FIG. 1 has shown the case where the slip prevention material with larger specific gravity than use resin is combined. The concave portion 11 of the lid body 10 is sufficiently shallower than the depth of the concave portion 11 and filled with the first resin 12, and the anti-slip material 13 is sprayed before the filled first resin 12 starts to be cured. Wait for the cure to finish. The anti-slip material 13 sinks down before the first resin 12 is cured and comes into contact with the surface of the lid recess 11 (b). The curing of the resin is indicated by cross lines in FIG. The upper surface of the cured resin 12 is filled with the second resin 14 (c), and then the anti-slip material 13 is sprayed on the second resin 14. The sprayed anti-slip material 13 settles in the second resin 14 and stops at the already cured first resin 12 (d). Therefore, the third resin 15 is filled on the second resin 14 (d), and before the curing starts, the anti-slip material 13 is sprayed (d) to cure the third resin 15 (e). Thus, it is possible to form an anti-slip measure in which the anti-slip material 13 is evenly distributed over the entire three-layer structure including the uppermost layer, the intermediate layer, and the lowermost layer. In the case of this example in which the anti-slip material 13 has a specific gravity greater than that of each of the resins 12, 14, 15, each of the resins 12, 14, 15 may be layered after the anti-slip material 13 is sprayed.
[0014]
FIG. 2 shows a second example in which an anti-slip material having a specific gravity smaller than that of the resin used is combined. In this case, the anti-slip material 20 is sprayed in advance into the recess 11 of the lid 10 (a Then, the first resin 21 is filled. After filling the first resin, the anti-slip agent 20 having a small specific gravity rises to a position corresponding to the specific gravity (b). The anti-slip material 20 is sprayed on the upper surface of the cured first resin 21 (c) and filled with the second resin 22 (d), and the anti-slip material 20 is floated and the second resin 22 is cured in the same manner as described above. wait. Further, the filling of the third resin 23 and the spraying of the anti-slip material 20 preceding thereto are performed in the same manner (e), and an anti-slip measure can be formed in which the anti-slip material 20 is evenly distributed throughout the three-layer structure. (F).
[0015]
FIG. 3 shows a third example in which an anti-slip measure is formed using a mixed resin 32 in which an anti-slip material 31 is premixed in the resin 30 used. In this case, the concave portion 11 of the lid body 10 is filled with the mixed resin 32 by one layer (a) and waiting for curing (b). When the second layer 34 is filled on the first lower layer 33, the lower layer needs to be cured as in the previous two examples (c, d). In FIG. 3 exemplifying the manufacturing method using the mixed resin 32, an example in which the anti-slip material 31 having a specific gravity larger than that of the used resin 30 is shown, but the anti-slip material (20) having a specific gravity smaller than that of the resin is used. It is clear that it can be used, in which case the anti-slip material will emerge from the lower layer.
[0016]
The base resin and the resin constituting the surface layer resin need only be durable materials that can withstand external forces such as vehicle traffic. For example, colored or non-colored epoxy resins, urethane resins, acrylic resins, etc. can be used. . Further, as the anti-slip material, a powdery or granular material that generates sufficient frictional resistance with a shoe sole or tire rubber is used. For example, silica sand, carborundum, ceramics, etc. can be used. Even if the anti-slip material is evenly dispersed, the thickness of each resin layer that is considerably smaller than 1 mm is worn in a relatively short period of time, and the adhesiveness is lowered, and it is easy to peel off. If it exceeds, curing of the resin to be used such as epoxy takes time, and it becomes difficult to form a plurality of resin layers depending on the depth of the lid recess. Therefore, it is desirable to be in the range of 1 mm to 3 mm. Therefore, it is desirable that the diameter of the anti-slip material is in the range of 1 mm to 4 mm.
[0017]
【Example】
1. A 6 mm deep recess made of ductile cast iron with a diameter of 1.5 mm is coated with silica sand having an average particle diameter of 1.5 mm as an anti-slip material and an epoxy resin colored yellow as the first resin is about 1 mm deep. After curing, the same silica sand as above is sprayed on the first resin, and further filled with a yellow colored epoxy resin to a depth of about 1 mm. The work of leaving for 7 hours was repeated twice to produce an iron lid with anti-slip measures consisting of all three layers.
2. A lid made of ductile cast iron with a diameter of 500 mm and filled with a 5 mm deep recess is filled with acrylic resin colored red as the first resin to a depth of about 2 mm, and immediately thereafter an average particle diameter of 2.5 mm as an anti-slip material. The glass is sprayed and allowed to stand at room temperature for about 5 hours to cure, and then the same red acrylic resin as the second resin is filled to a depth of about 2 mm. It was sprayed as a preventive material and allowed to stand at room temperature for about 5 hours to cure the second resin, thereby producing an iron lid with anti-slip measures consisting of two layers.
[0018]
In the case of Example 1, since the anti-slip agent is lighter than both the first and second resins, the anti-slip agent floats after the resin filling, whereas in the case of Example 2, the slip preventive agent is heavier than both the first and second resins. The prevention material will sink. In any of the examples, the anti-slip material is dispersed in the first and second resins, and exhibits an anti-slip effect from a state where a part of the anti-slip material comes out on the surface resin immediately after production, and continues until it is worn out.
[0019]
FIG. 4 is an illustration of the iron lid produced by the above-mentioned Example 1 with anti-slip measures, and the obtained recesses on the surface of the iron lid are filled with resin in three layers and dispersed in all resin layers. The anti-slip material is improving the frictional resistance. The second embodiment is similar in appearance to FIG.
[0020]
Further, when the surface layer resin was shaved with a blade and observed under a magnifying glass, it was confirmed that the anti-slip material was almost uniformly dispersed from the surface of the surface layer resin to the boundary surface with the lower layer resin. When the iron cover with the anti-slip measure applied to the manhole installed in the applicant company's premises, it is in contact with the forklift tires and soles every day for 20 months for Example 1 and for Example 2 Maintained a state where slip could be prevented for 15 months and exhibited the desired frictional resistance.
[0021]
【The invention's effect】
Since the present invention is configured and operates as described above, at least the anti-slip material dispersed almost uniformly in the upper resin layer exhibits a certain frictional resistance until the resin of the same layer is worn. It has the effect of maintaining the desired anti-slip effect over a long period of time. Further, the manufacturing method according to the present invention makes it possible to control the slip prevention material so as to be evenly distributed in the resin layer, and to reliably manufacture an iron lid that achieves the intended purpose.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first example for explaining step by step a method of manufacturing an iron lid with anti-slip measures according to the present invention.
FIG. 2 is a sectional view of a second example.
FIG. 3 is a sectional view of a third example.
FIG. 4 is a partial plan view showing an embodiment of an iron lid subjected to a slip prevention measure according to the present invention.
[Explanation of symbols]
10 Lid 11 Recess 12, 21 First Resin 14, 22 Second Resin 13, 20, 31 Anti-Slip Material

Claims (3)

An iron lid having unevenness for slip prevention on the surface of the lid that closes the opening of an underground structure, etc., and has at least two resin layers on the top and bottom, filled in the recess in the irregularity on the surface of the lid. The granular anti-slip material is fixed to the upper layer of at least two resin layers in a substantially uniform manner, and the anti-slip material has a particle size larger than the thickness of the resin layer in which it is distributed. Measured iron lid.   2. The iron lid subjected to anti-slip measures according to claim 1, wherein the resins constituting at least two resin layers are of the same type or of a type having an affinity for each other. A method for manufacturing an iron lid in which an anti-slip measure is applied to the surface of a lid body that closes an opening of an underground structure or the like, wherein the concave portion in the irregularities on the lid body surface is sufficiently shallower than the depth of the concave portion Filling the first resin with a layer thickness, filling the second resin on the first resin after curing the first resin, and repeating the curing operation to form at least two resin layers on the top and bottom, Before or after filling at least the first resin and the second resin, an anti-slip agent having a particle size larger than the thickness of the resin layer in which it is distributed is sprayed, or in the first resin and the second resin. The slip is characterized in that the anti-slip agent is distributed almost evenly in the resin layer by mixing and dispersing each anti-slip agent having a particle size larger than the thickness of the resin layer in which it is distributed. Manufacturing method of iron lid with preventive measures

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