JP5220693B2 - Design iron cover for underground structures - Google Patents

Description

  The present invention relates to a design iron lid for an underground structure having an anti-slip effect.

  When iron covers for underground structures such as manhole covers become wet, the friction coefficient of the surface is relatively lowered with respect to the asphalt road surface, which may cause a two-wheeled vehicle or a pedestrian to fall. Therefore, the surface of the iron lid is provided with a non-slip pattern consisting of a concavo-convex structure as a means to prevent slipping, and in order to further enhance the effect, measures such as devising the structure and pattern of the concavo-convex itself and applying anti-slip coating In some cases, a color resin mixed with ceramic is sprayed on the surface of the iron lid to achieve both the design of the color iron lid and the anti-slip effect. For the latter measure, we can find the direction of pursuing design for iron covers for underground structures. However, if we actually want to promote design, thermal spraying of colored resin mixed with ceramic or colored resin It can be seen that there is a limit to what can be expressed in anti-slip coating after filling.

  On the other hand, Japanese Patent Laid-Open No. 6-158684 discloses a decorative cover such as a manhole, which is supported by a lid body and has a surface layer portion detachably provided with a surface decorated with a required drawing, and the surface layer portion is replaceable. ing. However, there is no anti-slip means such as a concavo-convex structure on the surface of the lid body itself, and although it is described that a ceramic or an appropriate resin layer is formed on the surface of the surface layer portion to provide slip resistance, If the surface layer is peeled off and exposed, there is a risk of slipping even if the surface layer is not wet. Japanese Patent Laid-Open No. 2002-188169 discloses a manhole cover having an advertising function, and proposes a configuration in which an advertising medium is detachably fitted in and fixed to a recess of a predetermined size provided on the outer surface (surface). This is characterized in that a neon tube device, a hologram image, a liquid crystal image, an LED light emitting device, a cathode ray tube device, or a combination device thereof, which is an advertising medium, is fitted in a recess, but a driving power source is required. In addition, it is expensive and is judged to be a special facility that requires electrical maintenance. Japanese Patent Application Laid-Open No. 2009-24385 is characterized in that a color printing layer is formed on an upper surface of a bag or manhole cover having an uneven structure for preventing slippage on the upper surface. Is printed directly on the top of the lid. However, the top surface of the lid has a rugged structure for preventing slippage, and the image printed directly on the top surface of the lid is disturbed or distorted by the rugged structure. Sometimes it is necessary to remove the iron lid, carry it to the work place, and print it again.

  Of the above three conventional technologies, the direct printing type listed last seems to be most suitable for practical use, but the problem is that the color printing layer on the top of the lid covers the uneven structure. It is done. For example, an ink jet printer sprays ink on all of the concavo-convex structure, but the pattern that is actually visible is mainly on the upper surface of the convex portion. In spite of this, it must be pointed out that if the invisible portion other than the upper surface of the convex portion is printed, an extra amount of ink is required. In addition, since only the upper surface of the convex portion is worn and the other portions are not worn, printing on the upper surface of the lid is divided into places where it is worn and not worn. It can be guessed that it becomes difficult. In addition, even though the concavo-convex structure has an anti-slip function, when the upper surface of the concavo-convex structure is covered with a color printing layer, naturally the difficulty of slipping depends on the nature of the ink. However, this problem is not discussed at all, and there are aspects where safety measures are not sufficient.

Japanese Patent Laid-Open No. 6-158664 JP 2002-188169 A JP2009-24385A

  The present invention has been made paying attention to the above points, and the problem is that the design effect is greatly enhanced and the eyes of the public are attracted as compared with the conventional product filled with a color resin mixed with ceramic. It is to provide a design iron lid for underground structures having an anti-slip effect. Another object of the present invention is to prevent the fall of a two-wheeled vehicle or a pedestrian even when the surface of the design iron lid for underground structures gets wet with water or the design seal is peeled off. . Another object of the present invention is to meet demands for slip prevention and design change due to deterioration by exchanging design seals.

  In order to solve the above-mentioned problems, the present invention provides a design iron lid for an underground structure having an anti-slip effect, comprising slip prevention means made of a concavo-convex structure on the surface of the iron lid body, and a part of the concavo-convex structure or An edge portion is formed on the surface of the iron lid main body so that the upper end surface is positioned at a position higher than the upper surface of the convex portion constituting the surrounded uneven structure, and on the inner side along the edge portion. A step portion having the same height as the upper surface of the convex portion constituting the concavo-convex structure is provided, and an area surrounded by the rim portion is used as a sticking surface of the design seal. Take measures to ensure that the surface of the design seal has a thickness that stops at a position lower than the upper end of the edging portion and has anti-slip means on the surface when fixed on the upper surface and stepped portion. The Than is.

  The present invention is based on a design iron lid for underground structures having an anti-slip effect, and an uneven structure is formed on the surface of the iron lid to prevent slip, and this is used as a basic anti-slip means. Therefore, it is the object of the iron lid of the present invention that there is a pattern due to the concavo-convex structure on the surface, and the other objects are excluded. There are various types and forms of concavo-convex structures that have been improved in the past, but the conventional concavo-convex structure is either for anti-slip purposes or for visual effects by design, or a combination thereof It is. On the other hand, in the present invention, as described later, a new object of satisfying the performance necessary for securing the design seal while securing the bonding area is added.

  In the present invention, the concavo-convex structure is provided on almost the entire surface of the iron lid body. An edging portion is formed on the surface of the iron lid body so as to surround a part or all of the concavo-convex structure, and the upper end surface of the concavo-convex structure is positioned higher than the upper surface of the convex portion constituting the concavo-convex structure. The upper surface of the convex portion constituting the uneven structure is a flat adhesive surface. Here, the rim part that surrounds a part of the concavo-convex structure is a case where the region surrounded by the rim part is a part of the surface of the iron lid body, and the rim part that surrounds the entire concavo-convex structure is the rim part. This is a case where the region surrounded by the part is the entire surface of the iron lid body.

  A step with the same height as the top surface of the convex portion constituting the concavo-convex structure is provided on the inner side along the border portion, and the upper surface of the convex portion existing in the region surrounded by the border portion is attached to the design seal. Attached surface. The affixed design seal is easy to peel off from the periphery, but by adhering the design seal to the area surrounded by the border, the border can be protected from external force by the border around the periphery. At that time, since the upper end surface of the edging portion is positioned higher than the upper surface of the convex portion constituting the concavo-convex structure, the protective effect on the peripheral portion of the design seal can be further enhanced.

  Therefore, the design seal has such a thickness that the surface of the design seal stops at a position lower than the upper end of the edging portion when the design seal is affixed to the upper surface and the step portion of the convex portion. Since the upper surface of the seal itself is rubbed with a tire such as a motorcycle or a shoe sole, it has strength and durability that does not easily wear out, and is adhered so that it does not peel off. In addition, it is required that the adhesive material does not adhere easily, and it is also necessary not to adversely affect the environment. As a sealing material for such a design seal, for example, polyurethane resin, polyester resin, aluminum foil and the like are suitable. The design seal is fixed to the surface of the iron lid using an adhesive made of, for example, synthetic rubber, which is suitable for bonding the bonding surfaces.

  The design applied to the design sticker is preferably composed of a photograph formed by printing, delicate depictions, designs, letters, numbers and the like. Photos, symbols, signs, landmarks, routes, etc., advertisements, and PR are assumed as design motifs, but what should be set up and sponsors should freely negotiate what to display. It is. It is also a desirable requirement that the design seal is provided with a micro uneven structure provided with either or both of ceramic aggregate adhered to the surface and embossing embossed on the design seal. . The ceramic aggregate can be formed by attaching a sand-like material to the seal surface, and the emboss can be formed at the time of manufacturing the seal or at the time of printing.

  In order to drain the water accumulated on the surface of the design seal that is fixed to the affixed surface surrounded by the edging part, it is effective to provide a drainage groove in the edging part with the groove bottom being almost the same height as the design seal. is there. The drainage groove of the border portion also has an advantage that the corner formed by the recess of the groove portion has an anti-slip effect at the same time. Further, the convex portion of the concavo-convex structure constituting the anti-slip means has a pattern element having a remarkably wide flat surface and direction with respect to the height from the concave portion to the upper surface of the convex portion. The arrangement in which the directions intersect is desirable for maintaining the anti-slip effect while ensuring the bonding area of the design seal. As one form of the pattern element, taking the form of a curved line such as an eyebrow shape, an oval shape, or an oval shape as in the embodiment described later has a directionality, so that the anti-slip effect is enhanced by the cross arrangement. It is effective in improving durability because it does not concentrate external force.

  About the border part, this surrounds a part of the uneven structure on the iron lid surface, the above uneven structure is composed of pattern elements, and the distribution density of the pattern elements on the design seal affixing surface inside the border part Is arranged more densely than the outside of the edging part, and the concave part inside the edging part is set shallower than the outside, which increases the area of the upper surface of the convex part and is effective for strengthening the fixing strength of the design seal It is. The reason for the difference in density in the distribution of the pattern elements is to increase the bonding area and to reduce the spacing between the convex parts, and the friction coefficient is sufficiently achieved by the density outside the border part which is relatively sparse. ing. Moreover, when the area | region enclosed by the border part mentioned above is a part of surface of an iron lid main body, while reducing the space | interval between convex parts, the recessed part of the uneven structure inside a border part is shallow, that is, an edge part. Since the height is set higher than the height of the concave portion of the concavo-convex structure on the outer side of the surface, the possibility of the design seal being pierced by gravel, an umbrella's bump or the like can be reduced. As an uneven structure provided on the surface of the iron lid, the one having the upper surface as the application surface of the above design seal has been described, but this does not stop there, for example, a pin that hardly contributes to the adhesion of the design seal but improves the anti-slip effect Can be provided together.

  Since the present invention has a configuration in which the design seal formed by printing as described above is adhered and fixed to the inside of the border, the product filled with a color resin mixed with a conventional ceramic, and the like In comparison, there is an effect that it is possible to provide a design iron cover for an underground structure that has a slip prevention effect that can greatly enhance the design performance and attract the eyes of the public. In addition, according to the present invention, since the surface of the iron lid body is provided with a slip prevention means comprising a concavo-convex structure, even when the design seal is peeled off, the frictional force due to the surrounded concavo-convex structure is provided. Is obtained, and the anti-slip effect of the entire iron lid body surface is maintained, so that it is possible to prevent the motorcycle or pedestrian from falling over. In addition, according to the present invention, it is possible to respond to demands such as slip prevention due to deterioration and design change by exchanging design seals, and maintenance and pasting can be performed very easily.

  Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows Example 1 of a design iron lid 10 for an underground structure having an anti-slip effect according to the present invention, and the planar shape of an iron lid body 11 is circular, and as a slip prevention means on almost the entire surface thereof. In addition, it has a concavo-convex structure composed of convex portions 12 and concave portions 14. The example shown in FIGS. 1 to 7 is a case where the region surrounded by the edging portion 15 is a part of the surface of the iron lid main body 11, and the shape of the convex portion 12 is changed on the outside and inside of the edging portion 15. Therefore, the convex portion 12 inside the rim portion 15 is distinguished by attaching a dash “′” to the reference numeral. The convex portion 12 ′ has an eyebrow-shaped planar shape as a form satisfying the performance necessary for securing the design seal 20 while securing a sufficient bonding area.

The convex portion 12 ′ has a pattern that has a remarkably wide flat surface and directivity with respect to the height from the bottom of the concave portion 14 ′ of the concavo-convex structure to the upper surface of the convex portion 12 ′ in order to secure the bonding area of the design seal 20 Each element has an eyebrow-shaped planar shape (see FIGS. 2 and 3). The eyebrow-shaped planar shape has directionality in the same manner as curved shapes such as oval and ellipse, so that the anti-slip effect can be enhanced by crossover arrangement, and the external force is not concentrated. This also contributes to an improvement in durability with respect to the design seal 20. The illustrated protrusions 12 and 12 'have narrow grooves 13 and 13' provided in a direction crossing the eyebrow-shaped planar shape, and the area of the protrusions 12 and 12 'is hardly reduced. The anti-slip effect is increased (see FIG. 4).

  On the application surface of the design seal 20 inside the border 15, the distribution density of the eyebrow-shaped projections 12 ′ that are pattern elements is more densely arranged than the projection 12 outside the border 15, and The inner recess 14 'of the rim 15 is set shallower than the outer recess 14 (FIGS. 2 to 5). The reason why the distribution of the convex portions 12 and 12 ′ has a difference in density is that the adhesion area with respect to the design seal 20 is increased, and the distance between the convex portions can be narrowed to allow foreign matters to intervene in the concave portions 14 ′, 14 ′. This is to lower the sex. The friction coefficient is set so that it can be sufficiently achieved by the density outside the border 15 having a relatively sparse distribution density. As described above, the interval between the convex portions 12 ′, 12 ′... Is narrowed, and the concave portion 14 ′ of the concave-convex structure on the inner side of the rim portion 15 is formed shallower than the concave portion 14 on the outer side. The risk of the design seal 20 being pierced by a stone bump or the like can be significantly reduced.

As an uneven structure provided on the surface of the iron lid, in addition to the convex portions 12 ′, 12 ′,... In order to improve the stopping effect, pin-like convex portions 16 and 16 ′ are provided on both the inner and outer portions of the edge portion 15. The pin-like convex portions 16 and 16 'in the illustrated example are both located in a space generated by cross-arranging the convex portions 12 and 12'. When this is viewed centering on the pin-shaped convex portions 16 and 16 ', the four convex portions 12, 12, 12' and 12 'are rotationally symmetrically arranged around the convex portions 16 and 16'. It becomes a form. In addition, since the concave portion 14 ′ of the concavo-convex structure is formed shallower than the concave portion 14 outside the border portion 15 in the region inside the border portion 15, the pin-like convex portion 16 ′ in the region inside the border portion 15 is The height is lower than that of the pin-like convex portion 16 on the outer side of the rim portion 15, and this is the same for the convex portions 12, 12, 12 ', 12'.

A step portion 17 having the same height as the upper surface 12a ′ of the convex portion 12 ′ is provided on the inner base portion along the rim portion 15, and the entire region surrounded by the rim portion 15 is provided in the entire area of the design seal 20. The pasting surface 18 is used. The design seal 20 is affixed to the region surrounded by the border 15 over almost the entire periphery, thereby preventing the affixed design seal 20 from peeling off from the periphery. Further, the upper end surface 15a of the rim portion 15 is set to be slightly higher than the upper surface 12a 'of the convex portion 12' so as to enhance the protection effect on the peripheral portion of the design seal. Further, a drainage groove 19 is provided in the rim portion 15 in order to drain the water accumulated on the surface of the design seal 20 fixed to the affixing surface 18. The bottom of the drainage groove 19 may be almost the same height as the design seal 20, but is inclined so that the outflow side is lower.

  For example, the depth d1 of the concave portion 14 outside the rim portion 15 is about 6 mm. In this case, the height of the rim portion 15 is the same as that of the outer convex portion 12, and the concave portion inside the rim portion 15 is provided. The depth d2 of 14 'is about 3 mm, the height d3 of the convex part 12' from the bottom of the inner concave part 14 'is about 2 mm, and the thickness t of the design seal 20 is 0.6 mm. Therefore, when the design seal 20 is affixed to the upper surface 12a 'and the step portion 17 of the convex portion 12' and fixed, the surface of the design seal 20 stops at a position lower than the upper end of the edge portion (see FIG. 6).

  The seal itself is formed of a sealing material that has strength and durability that does not easily fatigue when rubbed with a tire or shoe sole such as a motorcycle that passes through the top surface of the seal. Glue. In the example shown in the figure, a polyurethane resin directly printed using an inkjet printer is used as a seal material for the design seal 20, which makes it difficult for dirt and sticky substances to adhere, and does not adversely affect the environment. The profit is gained. Such a design seal 20 is fixed to the surface of the iron lid using an adhesive made of synthetic rubber suitable for mutual adhesion between the surface of the iron lid main body 11 serving as an adhesive surface and the sealing material.

  It is more effective if the design seal 20 is provided with a design composed of a photograph formed by printing, delicate depictions, designs, letters, numbers, and the like. The illustrated example shows a state in which a design seal 20 in which a photograph of a rose flower is color-printed is adhered to the affixing surface 18, and the design sticker 20 in which a precise depiction that cannot be desired beyond this is printed. Made possible by. In the present invention, a design seal 20 having a design motif of all kinds of photographs, designs, signs, guides for sights and routes, advertisements, PR, etc. is manufactured, and an underground structure in which it is attached to the iron lid body 11 The design iron lid 10 can be used practically.

  The design seal 20 has a micro concavo-convex structure 21 provided with either or both of ceramic aggregate adhered to the surface thereof and emboss formed by embossing the design seal 20 as anti-slip means. (See FIGS. 6 and 7). The ceramic aggregate is formed by adhering a sand-like material to the seal surface, and the emboss is formed at the time of manufacturing the seal or printing.

  The design iron lid 10 for an underground structure according to the present invention of Example 1 configured as described above has, for example, the appearance shown in FIG. Also shown in FIG. The entire surface of the design iron lid 10 for an underground structure is provided with a concavo-convex structure as a slip prevention means as described above, and a design seal 20 is attached to an area surrounded by the border 15, Further, anti-slip means is provided on the surface. Accordingly, even when a motorcycle or shoes passes through the surface of the design iron lid 10 for an underground structure according to the present invention, the tire does not slip or take a foot because an appropriate frictional force acts. Even when it gets wet, the friction coefficient of the surface does not suddenly decrease with respect to the asphalt road surface.

In other words, when looking at the shoe 22, a passer-by passes the anti-slip means, which is an uneven structure cast on the surface of the iron lid body 11 at the shoe sole, and obtains a resistance by stepping on the design seal 20 adhered thereto. To do. At that time, the shoe sole steps on the concavo-convex structure composed of the convex portion 12 and the concave portion 14 in the region outside the rim portion 15 and steps on the micro concavo-convex structure 21 of the design seal 20 in the inner region to obtain the above frictional force. . This is the state shown in FIG. The design seal 20 is constantly rubbed by the shoe sole, but in the present invention, the edge 15 is positioned slightly higher than the surface of the design seal 20, and the peripheral edge that is easy to peel off is the inner side of the edge 15. Since it is adhered to the step portion 17, it is completely protected and there is no fear of peeling off from the peripheral edge. In addition, when the design seal 20 is struck by an umbrella's stone bump or the like, the interval between the convex portions 12 ′ inside the rim portion 15 is set to be as narrow as about 2 to 3 mm, so that there is little risk of piercing.

  If the design seal surface gets wet with rain due to rain, etc. during use, the water is drained from the drainage groove 19 formed in the edge 15 at any time. There is no. In addition, the printing of the design seal 20 may be worn out or partially peeled off after a long period of time after use, but safety is impaired because an anti-slip effect is obtained by the surrounded uneven structure. In addition, when the service life is reached, the design seal 20 is peeled off and replaced.

  In the above example 1 shown in FIGS. 1 to 7, the region surrounded by the rim portion 15 is a part of the surface of the iron lid main body 31. On the other hand, the present invention is a region surrounded by the rim portion. Includes the case where the surface is the entire surface of the iron lid body. An example 2 of the design iron lid 30 for underground structures is shown in FIGS. In the second example shown in FIG. 8 and subsequent figures, the planar shape of the iron lid main body 31 is circular, and has a concavo-convex structure including a convex portion 32 and a concave portion 34 and a pin-like convex portion 36 as a slip prevention means on almost the entire surface. (FIG. 9). The rim portion 35 surrounding the concavo-convex structure and the like surrounds the outer peripheral edge portion of the circular iron lid main body 31. The illustrated one is a ring-shaped member having a certain width, A step 37 having the same height as the upper surface of the convex portion 32 is provided (see the step 17, the pasting surface 18 and the like in FIG. 4), and the entire area surrounded by the rim 35 is formed on the design seal 20. The pasting surface 38 is used. Further, drain grooves 39a and 39b are formed in the circumferential direction and the radial direction inside the ring, respectively. The drainage grooves 39a and 39b communicate with each other, and the radiant drainage groove 39b is inclined at the lower side.

  The upper end surface of the rim portion 35 is positioned higher than the upper surface of the convex portion 32 of the concavo-convex structure surrounded by the rim portion 35, and the convex portion 32 is provided with a concavo-convex structure in order to secure a bonding area of the design seal 40. The eyebrow-shaped pattern element having a remarkably wide flat surface and direction with respect to the height from the bottom of the concave part 34 to the upper surface of the convex part 32, and slipping prevention by cross-arranging the pattern elements Increasing the effect, the convex part 32 has a narrow groove 33 provided in the direction crossing the planar shape of the eyebrows, increasing the anti-slip effect without impairing the area of the convex part 32, etc. Similar to Example 1 above (see FIGS. 2-5 for Example 1). Further, since the distribution density of the eyebrows-shaped convex portions 32 is on the inner side of the edge portion 35, it is set as dense as the inner side in Example 1. The design seal 40 also has a fine concavo-convex structure provided with either or both of ceramic aggregate adhered to the surface thereof and emboss formed by embossing the design seal 40 as anti-slip means. (See FIGS. 6 and 7).

  In Example 2 of the present invention configured as above, when a motorcycle or shoes passes through the surface of the design iron lid 30 for an underground structure, an appropriate frictional force acts so that the tire slips or removes a foot. Even when it gets wet, the friction coefficient of the surface does not suddenly decrease with respect to the asphalt road surface. Note that FIG. 10 shows only half of the design sticker 40 and the pasting surface 38 together. However, even if it is assumed that the pattern on the surface and the concavo-convex structure change abruptly, In the case of the invention, it may be considered that the friction coefficient does not change abruptly.

  The present invention is configured as described above, and exhibits the desired effect. However, the effect of providing the design seals 20 and 40 on a part or all of the uneven structure on the surface of the iron lid main body. As a difference, when it is provided in a part, it is easy to understand the existence of the iron cover, the shape of the design seals 20 and 40 can be freely selected such as a circle, a quadrilateral, other polygons, or an indefinite shape, and the cost can be suppressed. Can be mentioned. On the other hand, when it is provided on the entire surface, for example, it would be possible to expect unexpectedness that does not even recognize that there is an iron lid there.

It is a top view regarding Example 1 of the design iron lid for underground structures according to the present invention. It is a top view which shows the iron lid main body surface before design seal adhesion | attachment in the same as the above. It is the top view which similarly compared the iron lid main body surface before and behind design seal adhesion. It is an enlarged view of the uneven structure before design seal adhesion, A is a top view and B is a sectional view. It is an enlarged view of the uneven structure after design seal adhesion, A is a top view and B is a sectional view. It is an enlarged view which similarly shows the dimensional relationship of an uneven structure. It is sectional drawing which similarly shows a use condition. It is a top view regarding Example 2 of the design iron lid for underground structures according to the present invention. It is a top view which shows the iron lid main body surface before design seal adhesion | attachment in the same as the above. It is the top view which similarly compared the iron lid main body surface before and behind design seal adhesion.

10, 30 Designed iron cover for underground structures 11, 31 Iron cover body 12, 12 ', 32 Convex part
13, 13 ', 33 Narrow groove 14, 14', 34 Recess 15, 35 Edge 16, 16, 16 Pin-shaped protrusion 17, 37 Step 18, 38 Attaching surface 19, 39a, 39b Drain 20 , 40 Design seal 21 Micro uneven structure 22 Shoes

Claims (6)

It is a design iron lid for underground structures having an anti-slip effect,
Slip prevention means consisting of uneven structure on the surface of the iron lid body,
Forming an edge portion on the surface of the iron lid body that surrounds part or all of the concavo-convex structure and whose upper end surface is located at a position higher than the upper surface of the convex portion constituting the enclosed concavo-convex structure,
While providing a step with the same height as the upper surface of the convex part constituting the concavo-convex structure on the inner side along the edging part, an area surrounded by the edging part is used as a design seal attachment surface,
The design seal has such a thickness that the surface of the design seal stops at a position lower than the upper end of the edging portion when the design seal is affixed to the upper surface and the step portion of the convex portion, and the design seal slides on the surface. Designed iron lid for underground structures with stop means. 2. The design iron cover for an underground structure according to claim 1, wherein the design seal comprises a photograph formed by printing, a pattern, letters, numbers, etc. with delicate depictions. The underground structure according to claim 1 or 2, wherein the design seal is provided with a micro uneven structure provided with one or both of ceramic aggregate adhered to the surface and embossing embossed on the design seal. Design iron lid. 2. A drainage groove having a groove bottom at substantially the same height as the design seal is provided in the edging portion in order to drain moisture accumulated on the surface of the design seal fixed to the pasting surface surrounded by the edging portion. Designed iron lid for underground structures as described. The convex part of the concavo-convex structure, which constitutes the slip prevention means and is located inside the edging part, has a remarkably wide flat surface and directionality with respect to the height from the bottom surface of the concave part to the top surface of the convex part. The design iron cover for an underground structure according to claim 1, wherein the design element has a pattern element in a form provided, and the pattern element has an arrangement in which the directions intersect. The rim part surrounds a part of the concavo-convex structure on the surface of the iron lid, the concavo-convex structure is constituted by pattern elements, and the distribution density of the pattern elements on the application surface of the design seal inside the rim part is rimmed. The design iron cover for an underground structure according to claim 5, wherein the design iron cover is arranged more densely than the outside of the portion, and the recess inside the border is set shallower than the outside.

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