JPH09209379A - Structure of lid for cable-laying hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid structure that is excellent in watertightness, resists slip, and is advantageous in terms of cost. SOLUTION: A lid 2 comprises a metallic core 2a and a rubber layer 2b covering the surface of the core 2a, with the edges of the rubber layer 2b snugly fitted over the surface 1a of a flame 1. The metallic core 2a is constructed of, e.g., one steel plate 2a1 sized to fit the surface 1a of the frame 1 and, e.g. two H-steels 2a2 serving as reinforcement, placed on the lower surface of the steel plate 2a1. The rubber layer 2b is formed by vulcanizing and bonding a rubber material to the surface of the core 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid structure such as a manhole and a handhole used for laying various cables such as electric wiring, telephone lines, optical fibers for communication and CATV.

[0002]

2. Description of the Related Art Manholes and handholes are used for cable laying in underground wiring work in factories without electricity poles, telephone line burying work on general roads, telecommunications equipment burying work for public facilities, corporate facilities, etc. There is. Generally, manholes are used for laying trunk cables, and handholes are used for laying branch cables.
The basic structure is similar.

An example shown in FIG. 13 is a handhole used for burying telephone lines. The handhole is a box with a length of 1 m, a width of 2 m, and a height of about 1 m. The box 11 is made of concrete and has an open upper end.
The main body is a cast iron frame 12 fixed to the opening of No. 1 with adjustment mortar 15 and the like, and a cast iron lid 13 fitted to a frame surface 12a of the frame 12 (see FIG. 1B). Composed as an element. Pipe lines 14 for inserting cables (not shown) are provided on both sides of the box 11.

The above-mentioned hand hole is buried underground so that the upper surface of the lid 13 is flush with the ground surface G, and when entering or leaving the hole for maintenance of cable equipment, etc. The lid 13 fitted in 12 is lifted and removed with a lid lifting jig or the like. On the upper surface of the lid 13, in order to prevent slipping when a pedestrian walks on the handhole,
Grating, groove-shaped irregularities, and the like are provided.

[0005]

A conventional handhole (same for a manhole) is a lid 13 and a frame 12.
Is made of cast iron so that the weight of the heavy vehicle can withstand the load even when it travels over the handhole, and by casting it, the lid 13 and the frame 12 are properly This is for ensuring a good fit and enabling mass production.

However, in the cast product, it is difficult to obtain precision and flatness that are such that watertightness can be ensured in the matching portion between the lid 13 and the frame 12. Also, the lid 13 has
Normally, a through hole (not shown) for inserting the lid lifting jig is provided, but it is difficult to make the portion of the through hole a waterproof structure in terms of cost. Furthermore, when the upper surface of the lid 13 gets wet with rain or the like, it becomes very slippery.

Therefore, the present invention is intended to provide a lid structure which is excellent in watertightness, is hard to slip, and is advantageous in terms of cost.

[0008]

In order to achieve the above object, the present invention has a structure in which a lid is composed of a metallic core material and a rubber layer covering the surface of the core material.

The core material can be composed of a metal plate having a size that fits the frame surface of the frame body, and a metal reinforcing material disposed on the lower surface side of the metal plate.

The rubber layer may be formed by vulcanizing and adhering or vulcanizing and molding a rubber material on the surface of the core material.

The frame body may be a concrete molded body.

A structure in which a convex portion is provided on at least one of the frame surface of the frame body and the edge portion of the lid that fits the frame surface,
Alternatively, the frame surface of the frame body and the edge portion of the lid that fits this frame surface may be provided with a mutually compatible uneven portion or tapered portion.

Further, there is provided a structure in which an insertion portion for inserting the lid lifting jig from the outside is provided in the core material and the rubber layer of the lid, or the lid lifting jig is engaged with the upper surface of the lid. It is also possible to adopt a structure in which a convex-shaped handle is provided for the purpose.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a lid structure for a handhole as shown in FIG. 13 will be described below.

FIG. 1 shows a frame 1 and a lid 2 in a handhole. The frame 1 is made of concrete molded in a factory, and is fixed to the upper end opening of a concrete box as shown in FIG. 13 with adjusting mortar or the like. A stepped frame surface 1 a is provided on the inner upper portion of the frame body 1. The lid 2 is composed of a metal core material 2a and a rubber layer 2b covering the surface of the core material 2a, and the edge portion thereof is the frame body 1
It fits and fits the frame surface 1a.

In this embodiment, the metal core material 2a
Is composed of, for example, one steel plate 2a1 having a size suitable for the frame surface 1a of the frame body 1 and, for example, two H-shaped steels 2a2 as reinforcing members arranged on the lower surface side of the steel plate 2a1. Become. The two H-section steels 2a2 are arranged in the length direction of the steel plate 2a1.
The steel plates 2a1 are arranged with an appropriate interval between them to reinforce the steel plate 2a1 from the lower surface side. The reinforcing material is not particularly limited to the H-shaped steel 2a2, and ordinary shaped steel (angle steel, I-shaped steel, thin shaped steel, lightweight shaped steel), steel pipe, square steel pipe and the like can be used.

In this embodiment, the rubber layer 2b is formed by vulcanizing and adhering a rubber material to the surface of the core material 2a as described above. To fabricate the lid 2 having the structure shown in FIG. 1 by winding a rubber material (for example, raw rubber material) having a predetermined thickness around the surface of the steel plate 2a1 and the periphery of the two H-shaped steels 2a2, and adhering by vulcanization. You can In this case,
As shown in (b), the lower surface of the steel plate 2a1 and the H-shaped steel 2a2
The rubber layer 2b is also interposed between the rubber layer 2b and the upper end. Alternatively, two H-shaped steels 2a2 are placed in contact with the lower surface of the steel plate 2a1 (in some cases, the H-shaped steel 2a2 is attached to the lower surface of the steel plate 2a1).
May be temporarily fixed by an appropriate means. ), A rubber material having a predetermined thickness may be wound around the surface of the steel plate 2a1 and the periphery of the H-shaped steel 2a2, and adhesion by vulcanization may be performed. In this case, the rubber layer is not interposed between the lower surface of the steel plate 2a1 and the upper end of the H-shaped steel 2a2. The adhesion of the rubber material is not limited to vulcanization, but may be performed by other appropriate fixing means. Also, the rubber layer 2
b may be formed by vulcanizing and molding a rubber material on the surface of the core material 2a.

With the lid structure as described above, the upper surface of the lid 2 becomes the rubber layer 2b, so that it is hard to slip against general pedestrians and the like, and the core material is made of the steel plate 2a1 and the H-shaped steel 2a2. Since the load is supported by the 2a, it is possible to sufficiently bear the load even when the heavy vehicle travels on the handhole. Further, since the rubber layer 2b on the edge of the lid 2 is closely fitted to the frame surface 1a of the frame member 1, the watertightness is sufficiently high even if the precision and flatness of the fitting portion are not highly controlled. Can be secured. Moreover, the structure is advantageous in terms of cost.

In the embodiment shown in FIG. 2, a convex portion 2b1 is provided on the rubber layer 2b on the side surface of the lid 2. In this embodiment, the convex portion 2b1 has a triangular cross section, and
It is composed of two taper surfaces 2b2 and 2b3 which are continuous from the substantially central portion of the side surface to the upper surface and the lower surface. Convex portion 2b
When the tip end portion of 1 contacts the side wall of the frame surface 1a of the frame body 1, invasion of water or the like from the outside is effectively prevented,
Water tightness is further improved.

Similarly to the embodiment shown in FIG. 2, the embodiment shown in FIG. 3 is also one in which the rubber layer 2b on the side surface of the lid 2 is provided with a convex portion 2b4 having a triangular cross section. 2 is different in that it is provided in a rib shape at a substantially central portion of the side surface of 2.

Further, as shown in FIGS. 4 and 5, by utilizing the elasticity of the rubber layer 2b, the tips of the projections 2b1 and 2b4 are brought into contact with the side wall of the frame surface 1a of the frame 1 with a slight interference. By doing so, it is possible to obtain even better water tightness. Although not shown, the protrusions 2b1 and 2b
The cross section 4 is not limited to the triangular cross section, but may be various shapes such as a trapezoidal cross section and an arc cross section.

In the embodiment shown in FIG. 6, the rubber layer 2b on the side surface of the lid 2 and the side wall of the frame surface 1a of the frame body 1 are provided with a taper surface 2b5 and a taper surface 1a1 which are compatible with each other. The tapered surface 2b5 and the tapered surface 1a1 are fitted to each other by taper, so that good watertightness can be obtained.

In the embodiment shown in FIG. 7, the frame surface 1a of the frame body 1 is
On the side wall and the bottom wall of the convex portion 1a having a triangular cross section, respectively.
2, the convex portion 1a3 is provided. The convex portion 1a2 is composed of two taper surfaces 1a4 and 1a5 which are continuous from the substantially central portion of the side wall of the frame surface 1a to the upper end and the bottom wall, and the tip portion thereof is in contact with the rubber layer 2b on the side surface of the lid 2 to be watertight. Secure the sex. The convex portion 1a3 is provided in a part of the bottom wall of the frame surface 1a in the shape of a rib, and makes contact with the rubber layer 2b at the lower edge of the lid 2 so as to ensure watertightness. In addition, the convex portion 1a2 and the convex portion 1a3
It is also possible to adopt a structure in which only one of these is provided. Further, the convex portions 1a2, 1a3 are not limited to have a triangular cross section, but a trapezoidal cross section,
It may have various shapes such as an arcuate cross section.

In the embodiment shown in FIG. 8, the rubber layer 2b on the side surface of the lid 2 and the side wall of the frame surface 1a of the frame body 1 are provided with a convex portion 2b6 and a concave portion 1a6 which are compatible with each other. Convex part 2
Good watertightness can be obtained by matching b6 with the recess 1a6. In addition, in this embodiment, the convex portion 2b6 is provided on the side surface of the lid 2 and the concave portion 1a6 is provided on the side wall of the frame surface 1a.
The reverse is also acceptable. Further, the shapes of the convex portion 2b6 and the concave portion 1a6 are not limited to the rectangular cross section as shown in the figure, but may be various other shapes.

In the embodiment shown in FIG. 9, the rubber layer 2b at the lower edge of the lid 2 and the bottom wall of the frame surface 1a of the frame body 1 are provided with a concave portion 2b7 and a convex portion 1a7 which are compatible with each other. . Good watertightness can be obtained by matching the concave portion 2b7 and the convex portion 1a7. In this embodiment, the concave portion 2b7 is provided on the lower edge of the lid 2 and the convex portion 1a7 is provided on the bottom wall of the frame surface 1a, but the reverse is also possible. Also, the concave portion 2b7 and the convex portion 1a
The shape of 7 is not limited to the rectangular cross section as shown in the figure, but can be various other shapes.

By the way, as described above, the lid of the handhole is usually provided with a through hole (the structure of which is open in the hole) for inserting the lid lifting jig. However, it is difficult in terms of cost to make the through hole part waterproof. The embodiments shown in FIGS. 10 to 12 provide a structure capable of eliminating such a through hole from the viewpoint of ensuring watertightness.

In the embodiment shown in FIG. 10, the steel plate 1a of the lid 2 is used.
1 and an insertion hole 2c penetrating the rubber layer 2b covering the upper and lower surfaces thereof, the lower end of the insertion hole 2c is formed between the rubber layer 2b on the lower surface and the upper portion of the H-shaped steel 2a2. It has an opening in the concave space and does not communicate with the inside of the hole.
Therefore, even if water or the like enters from the upper end opening of the insertion hole 2c, it only collects in the concave space and does not enter the hole. When moving in and out of the hall, the lid lifting jig 3
Is inserted into the concave space from the upper end opening of the insertion hole 2c, and the hook-shaped portion 3a at the tip thereof is engaged with the lower surface of the lid 2,
Lift the lid 2.

In the embodiment shown in FIG. 11, the steel plate 2a of the lid 2 is used.
1 and an insertion hole 2d penetrating the rubber layer 2b covering the lower surface thereof
And the rubber layer 2b covering the upper opening of the insertion hole 2d is provided with an insertion cut 2e. Insert the lid lifting jig 3 into the insertion hole 2d from the insertion cut 2e,
The hook-shaped portion 3a at the tip is engaged with the lower surface of the lid 2 to lift the lid 2. The lower end opening of the insertion hole 2d communicates with the hole, but the insertion cut 2e of the rubber layer 2b covering the upper end opening is normally closed (when the lid lifting jig 3 is not inserted). Therefore, it is difficult for water, etc. to enter the hall. In particular, as shown in FIG.
This is an effective means when the structure as shown in FIG. 10 cannot be formed because a2 'and the like are used. The insertion notch 2e has a cross shape as shown in FIGS. 11 (a) and 11 (c), and I as shown in FIG. 11 (e).
The shape may be a letter, a Y shape, which is not shown, or other various shapes. 11 (d) and 11 (e)
At the end of each of the notches 2e for insertion,
1 is provided. This is for facilitating the insertion of the lid lifting jig 3 and for preventing the end portion of the insertion cut 2e from being torn when the lid insertion jig 3 is inserted.

In the embodiment shown in FIG. 12, the upper surface of the lid 2 is provided with a convex handle 2f for engaging a lid lifting jig. The handle 2f is provided on the upper surface of the steel plate 1a1 integrally or separately (by welding a separate handle member or the like), and the surface thereof is covered with the rubber layer 2b. An appropriate jig for lifting the lid is engaged with the handle 2f to lift the lid 2.

The structure of the embodiment described above can be similarly applied to the manhole cover structure.

[0031]

According to the present invention, the following effects can be obtained. (1) Since the rubber layer appears on the upper surface of the lid, the structure is hard to slip on a general pedestrian or the like. In addition, by coloring the rubber layer (the surface of the rubber layer may be colored later or the rubber layer may be formed from a rubber material containing a colorant) or a pattern, the road surface landscape can be improved. Can be better. (2) Since the load is supported by the metal core material, even when a heavy vehicle travels on the handhole,
It can withstand the load sufficiently. (3) Since the rubber layer at the edge of the lid is in close contact with the frame surface of the frame material, a sufficiently high watertightness can be secured without having to manage the precision and flatness of the compatible part at a high level. be able to. Therefore, it is possible to use a concrete molded body as the frame, which is an extremely advantageous structure in terms of cost. (4) A structure in which a convex portion is provided on at least one of the frame surface of the frame body and the edge portion of the lid that fits this frame surface, or the frame surface of the frame body and the edge portion of the lid that fits this frame surface. The watertightness can be further improved by adopting the structure in which the concave and convex portions or the tapered portions which are compatible with each other are provided. (5) A structure in which an insertion portion for inserting the lid lifting jig from the outside is provided in the core material and the rubber layer of the lid, or for engaging the lid lifting jig with the upper surface of the lid By adopting the structure in which the convex-shaped handle is provided, the through hole communicating with the hole in the conventional structure is unnecessary, and the watertightness can be secured.

[Brief description of drawings]

FIG. 1 is a perspective view (FIG. A) showing a lid and a frame body according to an embodiment of the present invention, and a bb sectional view (FIG. B) in FIG.

FIG. 2 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 8 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 9 is a partial cross-sectional view showing a lid and a frame body according to another embodiment of the present invention.

FIG. 10 is a perspective view (FIG. A) showing a lid and a frame body according to another embodiment of the present invention, and a bb sectional view (FIG. B) in FIG.
It is.

FIG. 11 is a perspective view (FIG. A) showing a lid and a frame body according to another embodiment of the present invention, a bb sectional view (FIG. B) in FIG. A, and a view of the insertion portion seen from above (FIG. C). , D, e).

FIG. 12 is a cross-sectional view (FIG. A) showing a lid and a frame body according to the embodiment of the present invention, and a view (FIG. B) of the insertion portion viewed from above.

FIG. 13 is a cross-sectional view (FIG. A) showing a conventional handhole,
It is an expanded sectional view (FIG. B) which shows the fitting part of a lid and a frame in FIG.

[Explanation of symbols]

 1 frame 1a frame surface 1a1 taper surface 1a2 convex part 1a3 convex part 1a6 concave part 1a7 convex part 2 lid 2a core material 2b rubber layer 2b1 convex part 2b4 convex part 2b5 tapered surface 2b6 convex part 2b7 concave part 2c insertion hole (insertion part) 2 Insertion hole (insertion part) 2e Insert notch (insertion part) 3 Lid lifting jig

Claims (8)

[Claims] 1. A lid structure for a cable laying hole, comprising a box body having an open upper end, a frame body fixed to the opening of the box body, and a lid adapted to the frame surface of the frame body. A lid structure for a cable laying hole, wherein the lid includes a metal core material and a rubber layer covering a surface of the core material. 2. The core material comprises a metal plate having a size that fits the frame surface of the frame body, and a metal reinforcing material disposed on the lower surface side of the metal plate. The lid structure for a cable laying hole according to claim 1. 3. The lid structure for a cable laying hole according to claim 1 or 2, wherein the rubber layer is formed by vulcanizing and adhering a rubber material to the surface of the core material. 4. The lid structure for a cable laying hole according to claim 1, 2 or 3, wherein the frame body is a concrete molded body. 5. The cable according to claim 1, wherein a convex portion is provided on at least one of a frame surface of the frame body and an edge portion of the lid that fits the frame surface. Cover structure for the laying hole. 6. The concave-convex portion or the tapered portion which is compatible with each other is provided on the frame surface of the frame body and the edge portion of the lid that fits the frame surface. The lid structure for the cable laying hole according to 4. 7. The core member and the rubber layer of the lid are provided with an insertion portion for inserting a lid lifting jig from the outside. Cover structure for the cable laying hole described. 8. The convex handle for engaging a lid lifting jig is provided on the upper surface of the lid, according to claim 1, 2, 3, 4, 5 or 6. Cover structure for cable laying holes.