JP2001182087A - Cover for underground structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain an initial excellent nonslip action even if wear advances to some extent. SOLUTION: A number of small projected parts 2 for slip prevention are provided distributedly on a cover body 1 provided so as to cover a ground opening part on those areas exposed to the ground side, and the upper ends of the small projected parts are formed on slante surfaces 3. The small projected parts are formed in a triangular pyramid having an inclined upper part, and the directions of inclination are differentiated from each other at the small projected parts where the inclined surfaces of the small projected parts are adjacent to each other. The small projected parts are same in shape, five or six small projected parts are disposed at equal intervals along the circumferential direction so that the specified apexes of the triangles of the small projected parts in flat shape are positioned close to each other and face toward the center of specified circles, a structure where the inclined surface tilts downward in the direction moving toward the center of the circumferential direction thereof is taken as a unit, and the unit is provided repeatedly in a pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron cover provided so as to cover an opening opening on the surface of an underground structure, and more particularly to a non-slip structure on an upper surface thereof.

[0002]

2. Description of the Related Art There have been many proposals for this kind of technology in the past, and most of them have a structure in which an unevenness is formed on an upper surface of a lid by an uneven pattern or a small convex portion. The anti-slip effect is produced. As shown in FIG. 6B, the general shape of the small projection is a trapezoidal cross section. In addition, for example, in Japanese Patent No. 2878663, a plurality of independent protrusions are arranged on the surface of the lid main body, and one or more small protrusions are provided on the upper surface of some or all of the protrusions. A configuration with a convex part,
There is disclosed a configuration in which a convex portion or a small convex portion having an acute edge is disposed on a part of the surface of the lid body. Japanese Patent Application Laid-Open No. 11-131517 discloses that a lower projection having a concave polygonal planar shape is formed on the lid surface as an uneven structure, and a small upper projection having a polygonal planar shape is formed on the upper surface of the lower projection. A formed configuration is disclosed. In addition to the above, there are those in which anti-slip irregularities are provided on the upper surface of the lid by small convex portions of various shapes.

[0003]

However, in the conventional projections forming the unevenness of the anti-slip, some of the projections are formed such that a part of the projections is formed at an acute angle at the upper end. In most cases, it is a plane parallel to the surface of the lid. When the upper end of the projection is flat, the depth at which the tire enters the recess between the projections when the rubber tire is mounted is small. Therefore, the anti-slip action is also small. For this reason, conventionally, a configuration is provided in which a smaller convex portion is provided on the upper surface of the convex portion. These small projections effectively work to prevent slippage, but wear is liable to progress. As the abrasion progresses, the anti-slipping effect is reduced as in the case of a convex portion having a flat upper end. Also,
It is conceivable to increase the protruding amount in consideration of the wear of the small convex portion, but if the protruding amount is too large, there is a risk of damaging the tire and the sole of the footwear and the footwear may be caught during walking, so it is not appropriate. . An object of the present invention is to provide a lid for an underground structure provided with a convex portion suitable for tires and footwear, which can maintain an initial good anti-slip action even when wear progresses to some extent.

[0004]

According to the present invention, there is provided a lid body provided so as to cover a ground surface opening, a large number of small protrusions for slip prevention are dispersedly provided on an upper surface exposed on the ground surface side of a lid body, An upper end of the small convex portion is formed on an inclined surface (claim 1).

[0005] By forming the upper end of the small convex portion on an inclined surface, the tire, the shoe sole and the like are less likely to slip than when the upper end is a plane parallel to the surface of the lid. That is, the change in the irregularities on the upper surface of the lid increases, the volume of the tire or the like entering between the small protrusions increases, and the amount of engagement with the small protrusions in the sliding direction increases by that amount. This state can be obtained by roughly arranging the dispersion state of the small protrusions in the conventional one,
When the upper end is formed on an inclined surface as in the present invention, it can be arranged more densely. Further, the anti-slip function is less reduced even when the wear progresses, as compared with the case where the upper end of the small convex portion is formed with an acute edge portion or the case where the small convex portion is further formed on the convex portion. The point that the decrease of the anti-slip effect is small is that the small convex part is worn more on the high side so that the entire inclined surface at the upper end gradually becomes horizontal, and it is more necessary to wear it to a state close to horizontal. This is because the amount of wear is required. Therefore, it is possible to cope with abrasion, and even if the abrasion progresses, there is little decrease in the anti-slip action. The upper surface inclination angle of the small projection is
It is good to make it 10 to 30 degrees, preferably around 20 degrees.

In the above means, it is preferable that the small convex portion is formed in a truncated pyramid shape having an inclined upper surface (claim 2). In this configuration, since the side surface of the small convex portion is inclined, it is possible to reduce the possibility of damaging the tire and catching the footwear as compared with the case where the small convex portion is vertical. The angle of inclination of the side surface of the small convex portion is preferably 25 ° to 60 °. In addition, the presence of the corners around the small protrusions increases the slip resistance of the portion of the tire or the like that bites between the small protrusions as compared with the case without the corners, thereby increasing the anti-slip action. In addition, since the corner of the upper end of the small convex portion formed by the upper inclined surface and the side surface of the small convex portion that is continuous with the upper surface is a portion against which the tire or the sole of the shoe is pressed, if the angle is small, the tire or the sole of the shoe becomes smaller. Etc.
By setting the obtuse angle, it is possible to further reduce damage to tires, footwear soles, and the like. The corner at the upper end of this small projection is 100 °
It is better to be up to 120 °.

In the above means, it is preferable that the small convex portion is formed in a truncated triangular pyramid shape having an inclined upper surface.

In the above means, it is preferable that the inclined surface of the small convex portion has a different inclination direction between adjacent small convex portions. With this configuration, it is possible to prevent the slip resistance from having a directional property, and therefore, it is possible to form a component having the same degree of anti-slip action in all directions.

In the above means, it is preferable that the small projections have the same shape. In this configuration, a similar sliding resistance can be obtained in any region by dispersing a large number of small protrusions almost uniformly.

In the above means (claim 3), the small projections have the same shape, and five or six small projections are close to each other at a predetermined vertex of a planar triangle of the small projections. Arranged at equal intervals along the circumference so as to head toward the center of the predetermined circle, and the configuration in which the inclined surface is inclined downward in the direction toward the center of the circumference is defined as one unit, and the pattern is repeated in that unit. (Claim 6). In this configuration, the inclination direction of the inclined surface at the upper end of the small convex portion is different for each of the small convex portion groups of one unit, and by repeating this in a pattern, uniform sliding in all directions in the entire region. Resistance can be obtained. In addition, the small convex group of one unit has a pattern like a flower, and is excellent in design.

[0011]

Embodiments of the present invention will be described below. In the first embodiment, as shown in FIGS. 1 and 2, a large number of small projections 2 are provided on the upper surface of a lid body 1 to form a non-slip. In this example, the main body 1 is for a circular underground structure opened on the road surface, and can be opened and closed by attaching and detaching to and from a receiving frame (not shown) having a circular opening edge. ing. Many small projections 2
Both have the same shape, one of which is shown in FIG.
As shown in enlarged form in (b) and (c), it has a substantially truncated triangular pyramid shape, but the upper end surface is not horizontal but formed on the inclined surface 3. The inclination angle θ of the inclined surface 3 is about 20 ° with respect to the upper surface of the main body 1, that is, the plane parallel to the road surface.
The planar triangle is an isosceles triangle having an angle θ1 of about 40 °. The dimension W is about 15 mm, and the dimension L is about 21
mm and H are about 6 mm. The rising angles θ3, θ4, θ5 of the side surfaces of the small convex portion 2 in the figure are in the range of 25 ° to 60 ° so as to prevent pedestrians from tripping,
Is related to θ and θ3, but is in the range of 100 ° to 120 ° in order to reduce damage to tires and the like.

As shown in FIG. 2D, the arrangement of the small projections 2 is such that all the small projections 2 are formed independently.
The corner formed by the isosceles in the planar shape of the small convex portion abuts on the small circle 4 so as to fit between the outside of the small circle 4 having the diameter d1 and the inside of the large circle 5 having the diameter D1 concentric with the small circle 4. Then, six small convex portions 2 are arranged at equal intervals on the circumference to make one unit, and this unit is planarly repeated as shown in FIG. It is provided in a pattern. The inclined surface 3 of the small convex portion 2 is inclined downward toward the center of the small circle 4. In this case, the repeating pattern is a repetition of an arrangement in which three adjacent units are positioned at the corners of one equilateral triangle. The small convex portion 2 is formed in a flat concave portion 7 with a depth corresponding to the height of the small convex portion 2 while leaving the edge 6 on the upper surface of the lid main body 1 with an appropriate width, The recess 7 is provided in the whole area. D1 is about 6 mm, D1 is about 50 mm
It is.

FIGS. 3 and 4 show a second embodiment. This lid 1 ′ has a configuration in which the arrangement of the small projections 2 is 5 units.
The second embodiment is the same as the first embodiment except for the same point. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.

The lid bodies 1, 1 'thus constructed are
Either of them exhibits a good anti-slip effect almost similarly. That is, by forming the upper end surface of the small convex portion 2 on the inclined surface 3, when the tire T is mounted on the upper surface, the bite amount e1 of the tire is large as shown in FIG. Also,
Since the corners are formed at the uppermost part, the tires and the soles of the shoes are easy to bite, which also has a large anti-slip action. On the other hand, when the upper end surface of the conventional small convex portion 2a shown in FIG. 5B is a flat plane, the bite amount e2 of the tire T is small. In order to increase the bite amount e2, it is necessary to increase the arrangement interval of the small protrusions 2a, which causes problems such as pedestrians easily tripping or twisting their feet.
Can't be too big. Further, as shown in FIG. 6A, the unevenness of the upper surface is largely changed in the small convex portion 2 of the present invention, but as shown in FIG. 6B, the upper end is flat in the conventional small convex portion 2a. There is little change in unevenness on the upper surface Therefore, the embodiment of the present invention is excellent in that the anti-slip action is large even when the small convex portions 2 are densely arranged.

Further, the rising angle of the side surface of the projection is 25 °.
By setting the angle within the range of 〜60 °, it is possible to sufficiently prevent pedestrians from tripping, in addition to the fact that they can be arranged densely. In addition, since five or six small projections 2 are arranged on the circumference to constitute one unit, even if these units are arranged in a continuous pattern, the inclined surface 3 at the upper end of each small projection 2 is formed. There is no bias in the directionality of the tire, and there is no occurrence of a situation where the tire or the sole of the shoe easily slips in a specific direction.

Further, since the upper end surface of the small convex portion 2 is an inclined surface with a not so large inclination angle, the entire surface is worn by contact with a tire or the like, and as shown in FIG. The small convex portion 2 ′ and the small convex portion 2 ″ are worn out. That is, the inclined surface on the upper end surface tends to be worn on the higher side and less on the lower side, so that the original inclined angle cannot be maintained, but the inclined angle cannot be maintained. The surface is maintained for a considerably long period of time, so that even if the wear progresses to a certain extent, the inclined surface is maintained and the anti-slipping action close to the initial anti-slipping action is maintained, so that it is excellent in that it can cope with abrasion.

[0017]

According to the first aspect of the present invention, slip resistance is reduced.
Even if abrasion progresses, an effect is obtained in which the anti-slip effect is hardly reduced. The invention according to claims 2 and 3 has an effect of reducing the possibility of damaging a tire or catching footwear. The invention described in claim 4 has an effect that it can be formed to have the same anti-slip action in all directions. The invention described in claim 5 has an effect that a similar sliding resistance can be obtained in any region by dispersing a large number of small protrusions almost uniformly. The invention according to claim 6 has an effect that uniform sliding resistance can be obtained in all directions and that the design is excellent.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a plan view, and FIG.

FIG. 2A is a plan view showing a small convex portion according to the embodiment;
(B) is a front view, (c) is a side view, and (d) is a plan view showing a configuration of one unit of the small convex group.

FIGS. 3A and 3B show a second embodiment of the present invention, wherein FIG. 3A is a plan view and FIG.

FIG. 4 is a plan view showing a configuration of one unit of a collision unit group of the embodiment.

FIG. 5 shows a state in which a tire or the like rests on a small convex portion (a).
Is an explanatory view of an embodiment of the present invention, and (b) is an explanatory view of a conventional example.

FIGS. 6A and 6B show a state of a change in the upper surface due to the provision of the small projections, wherein FIG. 6A is an explanatory diagram of the embodiment of the present invention, and FIG.

FIG. 7 is an explanatory diagram showing progress of abrasion of a small convex portion according to the embodiment of the present invention.

[Explanation of symbols]

 1, 1 'lid body 2 small convexity 3 inclined surface 4 small circle 5 large circle 6 edge 7 recess

Claims (6)

[Claims] 1. A large number of small protrusions for slip prevention are dispersedly provided on an upper surface exposed on the ground surface side of a lid main body provided to cover a ground surface opening, and an upper end of the small protrusion is formed on an inclined surface. A lid for an underground structure, wherein the lid is formed. 2. The lid for an underground structure according to claim 1, wherein the small projection is formed in a truncated pyramid shape having an inclined upper surface. 3. The underground structure lid according to claim 1, wherein the small projection is formed in a truncated triangular pyramid shape having an inclined upper surface. 4. The underground structure lid according to claim 1, 2 or 3, wherein the inclined surface of the small convex portion is:
A cover for an underground structure, characterized in that adjacent small convex portions have different inclination directions. 5. The underground structure according to claim 1, 2, 3, or 4, wherein the small projections have the same shape. Cover. 6. The underground structure lid according to claim 3, wherein the small protrusions have the same shape, and five or six of the small protrusions are formed into a predetermined triangular shape having a planar shape of the small protrusion. Are arranged at regular intervals along the circumference so that the vertices approach and head toward the center of a predetermined circle, and the configuration in which the inclined surface is inclined downward in the direction toward the center of the circumference is defined as one unit, A cover for an underground structure, wherein the units are repeatedly provided in a pattern.