JP7608064B2 - Lid, storage container and storage unit - Google Patents

Description

The present invention relates to a lid body used to close the opening of a storage container body that stores cables or the like, and to a storage container and a storage unit that include this lid body.

Efforts are underway to house cables such as communication lines and power lines that were previously installed on utility poles in cable housing containers and install them underground or within roads as electric cable joint tunnels. Of these, electric cable joint tunnels, which are composed of cable housing containers with lids installed on the road surface and installed within roads, have the advantage that it is easier to lay cables inside the containers after installation compared to electric cable joint tunnels composed of conduits buried underground.

Concrete and resin-made troughs are known as storage containers (troughs) capable of storing cables and other items. Of these, resin cable storage containers have the advantage of being lighter than concrete ones and easier to cut and process on-site.

On the other hand, resin has weaker mechanical strength than concrete, so the lids of cable housing containers located in vehicle paths need to be thicker than those located in pedestrian paths in order to increase their mechanical strength. In particular, when part of a cable housing container is located on a road straddling a vehicle path and a pedestrian path, it is expected that either only the lids of the cable housing containers located in the vehicle path will be made thicker, or the lids of all cable housing containers, including those located in the pedestrian path, will be made thicker.

However, if only the lid of the cable housing container located in the vehicle path is made thicker, the height positions of the top surfaces of the lids of the cable housing container located in the vehicle path and the lid of the cable housing container located in the pedestrian path will differ, creating a step, which may cause the lid to be damaged. Furthermore, if a cable housing container located in the vehicle path is buried by digging a deeper trench, burying the cable housing container will require more work and time. Furthermore, if the thickness of the lids of all cable housing containers is made thicker, not only will it take more time to bury the cable housing containers, but the lids of the cable housing containers located in the pedestrian path will be thicker than necessary, which will result in an increase in material costs.

In addition, in the case of using a concrete cable storage container and a resin cable storage container together, for example, Patent Document 1 describes a cable storage unit in which a concrete trough and a resin trough are connected using a connecting trough having one end formed as a connection part with the concrete trough and the other end formed as a connection part with the resin (plastic) trough. This connecting trough is covered by a connecting lid, one end of which is connected to a concrete lid (trough cover) that covers the concrete trough, and the other end of which is connected to a resin lid that covers the resin trough.

Japanese Utility Model Application Publication No. 62-074443

The cable housing unit described in Patent Document 1 is for installing a concrete trough in an area with a high volume of pedestrians and motorcycles, and does not take into consideration the installation of a plastic trough in a vehicle path. In addition, the height positions of the top surfaces of the concrete trough cover and the plastic trough cover differ, which is not desirable for allowing pedestrians and vehicles to pass through. In addition, the cable housing unit described in Patent Document 1 requires the production of multiple troughs of different materials and shapes, which tends to increase manufacturing costs and is thought to be difficult to install.

Furthermore, these issues were not limited to cases where cables were stored in a storage unit, but were also common when storing other items.

The object of the present invention is to provide a lid body that can be reinforced so that it can be used even when installed on a vehicle's path without changing the height of the storage container, and a storage container and storage unit equipped with this lid body.

The inventors conducted extensive research to solve the above-mentioned problems. As a result, they discovered that by attaching lid reinforcing members to at least both ends in the width direction along the inner surface of the lid body, the stress acting on the lid is reduced, making the lid less likely to break, and thus they were able to complete the present invention.

That is, the gist of the present invention is as follows.
(1) A resin-made storage container lid including a storage container body and a lid, the lid having a lid body constituting an upper surface, which is an outer surface of the storage container, and a lid reinforcing member attached along an inner surface of the lid body and fixed to at least both ends of the inner surface in the width direction, the lid reinforcing member being configured to accommodate a portion protruding from the inner surface of the lid body, the lid body and the lid reinforcing member being configured to be in close contact with each other, and the lid being used to close an opening in a storage container body having an internal space below an opening at an upper end. a lid body capable of being reinforced in strength, wherein the lid body main body is made of a material having a compressive strength of 21 MPa or more, the lid body reinforcing member is made of a material having a strength greater than that of the lid body main body, and further, a convex portion (rib) on the inner surface of the lid body main body is accommodated in a storage portion of the lid body reinforcing member, so that when the lid body main body is subjected to a load applied downward from the top surface of the lid, the inner surface of the storage portion of the lid body reinforcing member restrains the outer peripheral surface (top and side surfaces) of the convex portion (rib) of the lid body, thereby making it possible to suppress bending deflection of the lid body.
(2) The lid body described in (1) above, wherein the lid body main body is made of a thermoplastic resin material or a recycled resin material, and the lid body reinforcing member is made of at least one material selected from the group consisting of engineering plastic material, fiber-reinforced plastic material, and metal material.
(3) A lid according to (1) or (2) above, wherein the lid reinforcing member is made of a material having a tensile strength of 100 MPa or more.
(4) A lid body capable of being reinforced in strength as described in (3) above , characterized in that the convex portion which is the rib structure of the lid body main body housed in the lid body reinforcing member is configured to divide the inner surface of the lid body main body into a triangular shape, a square shape, or a honeycomb shape .
(5) A resin-made storage container including a storage container body having an internal space and an open upper end, and a lid body used to close the opening of the storage container body, the storage container being configured to store a cable in the internal space, the lid body having a lid body main body constituting an upper surface which is an outer surface of the storage container, and a lid body reinforcing member attached along an inner surface of the lid body main body and fixed to both ends of the lid body main body in at least a width direction, the lid body reinforcing member being configured to store a portion protruding from the inner surface of the lid body main body, the lid body main body and the lid body reinforcing member being configured to be in close contact with each other, the lid body having an internal space below the opening at the upper end, and being used to close the opening of the storage container body that is buried so as to be located in a passageway where vehicles can pass, the lid body being 21 M a lid reinforcing member that is made of a material having a compressive strength of 100 MPa or more and that is made of a material that is stronger than the lid body, and further, a convex portion (rib) on the inner surface of the lid body is accommodated in a accommodating portion of the lid reinforcing member, so that when the lid body is subjected to a load applied downward from the top surface of the lid, the inner surface of the accommodating portion of the lid reinforcing member restrains the outer peripheral surface (top and side surfaces) of the convex portion (rib) of the lid body, thereby suppressing bending deflection of the lid body.
(6) A storage unit formed by connecting a plurality of storage containers according to (5) above along the extension direction of the storage containers.
(7) A method for forming a storage unit according to (6) above, characterized in that at least a portion of the storage unit includes a storage container using a lid body consisting only of the lid body main body.
(8) A method for installing a storage unit according to (6) above, characterized in that the storage unit is buried in a road so as to be located in a passageway where vehicles can pass.

The present invention provides a lid body that can be reinforced to be used even when installed on a vehicle path without changing the height of the storage container, and a storage container and storage unit equipped with this lid body.

FIG. 1 is a perspective view showing the structure of a storage container equipped with a lid according to an embodiment of the present invention. FIG. 2 is a view showing an example of the inner surface of the lid body of the embodiment according to the present invention. 3A and 3B are diagrams showing modified inner surfaces of the lid body of an embodiment according to the present invention, in which FIG. 3A shows an example in which the inner surface is divided into triangles, FIG. 3B shows an example in which the inner surface is divided into squares, and FIG. 3C shows an example in which the inner surface is divided into a honeycomb shape. FIG. 4 is a conceptual diagram showing stresses that are applied when a load is applied to the lid of the embodiment according to the present invention. FIG. 5 is a conceptual diagram showing an example of a storage unit according to the present invention installed on a paved road.

Next, a preferred embodiment of the present invention will be described below.

Fig. 1 is a perspective view showing the structure of a storage container equipped with a lid according to an embodiment of the present invention. Fig. 2 is a view showing an example of the inner surface of the lid body according to an embodiment of the present invention. Fig. 3 is a view showing a modified example of the inner surface of the lid body according to an embodiment of the present invention, in which Fig. 3(a) shows an example in which the inner surface is divided into triangles, Fig. 3(b) shows an example in which the inner surface is divided into squares, and Fig. 3(c) shows an example in which the inner surface is divided into a honeycomb shape. Fig. 4 is a conceptual diagram showing stress applied when a load is applied to the lid according to an embodiment of the present invention.

The lid body 1 according to the embodiment of the present invention is a lid body for a resin storage container (trough) 10, and as shown in FIG. 1, the lid body 1 has a lid body main body 2 constituting the outer surface 11, and a lid body reinforcing member 3 attached along the inner surface 21 of the lid body main body 2 and fixed to at least both ends 22a, 22b of the inner surface 21 in the width direction Y, and is capable of being reinforced in strength. Here, the width direction Y is the width direction when the lid body 1 is installed on the storage container main body 4 described later to form the storage container 10, but before the lid body 1 is installed on the storage container main body 4, one of the short side direction and the long side direction of the lid body 1 can be the width direction Y. In this way, by attaching the lid body reinforcing member 3 attached along the inner surface 21 of the lid body main body 2 and fixed to at least both ends 22a, 22b of the inner surface 21 in the width direction Y, the stress applied to the lid body 1, particularly bending stress, is reduced, making it difficult for the lid body 1 to break. Therefore, it can be used even when installed on a vehicle passageway without changing the height of the storage container 10.

(Lid body)
The lid body 2 of the lid body 1 constitutes the outer surface 11 of the storage container (trough) 10. More specifically, the lid body 2 constitutes the outer surface 11, typically the upper surface, when the openings at the upper ends 43, 43' of the storage container body 4 are closed with the lid body 1 to obtain the storage container 10. In other words, the lid body 2 is a portion on which the load of vehicles V, pedestrians P, and the like passing over the storage container 10 is directly applied.

The shape of the lid body 2 is not particularly limited as long as the lid body reinforcing member 3 described later can be attached. Therefore, the lid body 2 may be a general-purpose lid for a cable storage container, and may have unevenness on the inner surface 21 facing the internal space H, as shown in FIG. 2. FIG. 2 shows a lid body 2 having a lattice-shaped protrusion (rib) 23 on the inner surface 21 as an example of a general-purpose lid for a cable storage container (lid body 2), which divides the inner surface 21 into a rectangle, but the lid body reinforcing member 3 described later can also be provided on such a lid body 2. In the lid 1 of this embodiment, by providing unevenness on the inner surface 21 of the lid body 2, the joint with the lid body reinforcing member 3 described later can be improved, and positional deviation in the extension direction X and width direction Y of the storage container 10 can be prevented.

Here, as the lid body 2, a lid body 2A may be used in which the inner surface 21A is divided into triangles by protrusions (ribs) 23 as shown in FIG. 3(a). Alternatively, a lid body 2B may be used in which the inner surface 21B is divided into squares by protrusions (ribs) 23 as shown in FIG. 3(b). Alternatively, a lid body 2C may be used in which the inner surface 21C is divided into a honeycomb shape by protrusions (ribs) 23 as shown in FIG. 3(c).

The inner surface 21 of the lid body 2 is the surface that faces the internal space H when the storage container 10 is constructed, and is the surface that is located inside the portion that contacts the upper end 43, 43' of the storage container body 4. Here, the portions of the lid body 2 that contact the upper end 43, 43' of the storage container body 4 are often at both ends of the lid body 2, and are configured to be thinner when combined with the lid body reinforcing member 3 described below. Therefore, both end portions 22a, 22b of the inner surface 21 of the lid body 2 in the width direction Y can be portions of the inner surface 21 that are more inside than the portions of the inner surface 21 that are thinner.

The material of the lid body 2 is made of resin, and is preferably made of a thermoplastic resin material or a recycled resin material. Here, the thermoplastic resin material may be a material containing polyethylene, polypropylene, or the like. The recycled resin material may be a resin material whose main ingredient is recycled resin from waste resin or discarded cables. In this way, by making the lid body 2 out of resin, the lid body 1 becomes lighter, and therefore the lid body 1 can be easily carried when installing the storage container 10 or when performing maintenance work.

(Lid body reinforcing member)
The lid reinforcing member 3 provided on the lid 1 can reinforce the strength of the lid 1 by attaching it to the inner surface 21 of the lid body 2. More specifically, the lid reinforcing member 3 is attached along the inner surface 21 of the lid body 2, and fixed to at least both ends 22a, 22b of the inner surface 21 in the width direction Y. At this time, it is preferable that the protrusion 31 made of the lid reinforcing member 3 is configured to protrude from the lid body 2. By providing the lid reinforcing member 3 in this manner, a part of the stress acting on the lid 1 from the outer surface 11 of the lid 1 is borne by the lid reinforcing member 3, so that the rigidity of the lid 1 as a whole is increased. Here, one of the causes of the lid 1 being damaged when a large load is applied to the lid 1 is that the stress acting on the lid 1 from the outer surface 11, especially the bending stress, becomes excessive. Therefore, in the storage container of this embodiment, part of the stress acting on the lid body 1 from the outer surface 11, particularly part of the bending stress, is borne by the lid body reinforcing member 3, thereby increasing the rigidity of the lid body 1 and making the lid body 1 less likely to break without changing the thickness of the lid body 1.

As shown in FIG. 4, when a load L is applied downward from the outer surface 11 of the lid body 1 to the lid body 1, the lid body 1 is subjected to two types of stresses, which are broadly classified as bending stress (a combination of compressive stress C and tensile stress P shown in FIG. 4) and shear stress S. Of these, bending stress is applied to the lid body 1 in the vicinity of the point where the load L is applied. In particular, when the load L is applied to the entire outer surface 11 of the lid body 1, bending stress is applied near the center of the outer surface 11 of the lid body 1. On the other hand, shear stress is applied to the vicinity of the portion of the lid body 1 that contacts the upper ends 43, 43' of the storage container main body 4.

As shown in Figures 1 and 4, when the width of the lid body 1 (the size of the lid body 1 along the width direction Y of the storage container 10) is greater than the thickness of the lid body 1 (the size of the lid body 1 along the height direction Z of the storage container 10), the bending stress is greater than the shear stress S, and the bending stress in particular is the cause of damage to the lid body 1. Therefore, in the present invention, part of the stress acting on the lid body 1, more preferably part of the bending stress, is borne by the lid body reinforcing member 3, thereby making it less likely for the lid body 1 to be damaged.

It is preferable that the lid reinforcing member 3 is made of a material stronger than the lid body 2. This makes it more difficult for the lid body 2 to break because the lid reinforcing member 3, which has a high strength, bears part of the stress, making it less likely for the lid body 2 to break.

The material of the lid reinforcing member 3 is preferably at least one of engineering plastic material, fiber reinforced plastic (FRP) material, fiber cloth material, and metal material. Here, examples of the engineering plastic material include polyamide and polycarbonate. By configuring the lid reinforcing member 3 from these materials, the tensile stress P applied to the lid reinforcing member 3 becomes large, so that the lid 1 becomes less likely to break. In particular, by configuring the above-mentioned lid main body 2 from a material with a large compressive stress C and configuring the lid reinforcing member 3 from a material with a large tensile stress P, it is possible to make the lid 1 less likely to break.

Moreover, the lid reinforcing member 3 is preferably made of a material having a tensile strength of 100 MPa or more. In this case, it is more preferable that the lid body 2 to which the lid reinforcing member 3 is attached is made of a material having a compressive strength of 20 MPa or more. This increases the compressive stress C in the lid body 2 on the outside of the lid 1, and also increases the tensile stress P applied to the lid reinforcing member 3 on the inside of the lid 1. Therefore, when the load L is applied from the outer surface 11 of the lid 1 to the inside, the bending stress applied by the load L is mitigated by the combination of these materials, making it possible to make the lid 1 less likely to break.

The lid reinforcing member 3 is preferably configured to accommodate the portion protruding from the inner surface 21 of the lid body 2, i.e., the convex portion (rib) 23 of the lid body 2. As a result, since the lid reinforcing member 3 is made of a material stronger than the lid body 2, the lid reinforcing member 3 is less likely to deform than the lid body 2, and therefore the convex portion (rib) 23 of the lid body 2 is not only pressed against the inner surface (top surface) of the convex portion (rib) 23 of the lid body 2 by the accommodating portion of the lid reinforcing member 3, but also the side surface of the convex portion (rib) 23 of the lid body 2 is sandwiched in the accommodating portion of the lid reinforcing member 3, thereby increasing the contact area between the convex portion of the lid body 2 and the lid reinforcing member 3 in the height direction plus the width direction , and thus suppressing both the deformation in the height direction and the deformation in the width direction of the lid body 2. Therefore, it is easier for the lid reinforcing member 3 to bear part of the bending stress acting on the lid 1, making it more difficult for the lid 1 to break.

It is also preferable that the lid reinforcing member 3 is configured so that it can be additionally attached to the lid body 2. This makes it possible to select whether or not to reinforce the strength of the lid 1, depending on whether or not the lid reinforcing member 3 is attached. This eliminates the need to manufacture storage containers 10 made of different materials or shapes, thereby reducing the manufacturing costs of the storage containers 10 to be installed and improving the ease of installation of the storage containers 10.

For example, when burying the container 1 across locations where the load L applied to the container 1 is significantly different, such as the path 61 for vehicles V and the path 62 for pedestrians P, the container reinforcing member 3 can be configured to be detachable from the container body 2, so that in locations where the load L is large (e.g., the path 61 for vehicles V), the container reinforcing member 3 can be used to reduce damage to the container 1. At the same time, in locations where the load L is small (e.g., the path 62 for pedestrians P), the opening of the container body 4 can be closed without using the container reinforcing member 3, thereby reducing the manufacturing cost of the container 10 and improving the ease of installation of the container 10.

The lid reinforcing member 3 may be molded integrally with the lid body 2 made of a different material. In this case, the work of attaching the lid reinforcing member 3 to the lid body 2 can be eliminated when installing the storage container 10.

Methods for attaching the lid body reinforcing member 3 to the lid body main body 2 include forming an adhesive layer on the contact surface between the lid body main body 2 and the lid body reinforcing member 3 and heat fusing the contact surface, as well as bolt fixing or shrink fitting into the through hole connecting the lid body main body 2 and the lid body reinforcing member 3, and are not particularly limited.

(Storage container body)
The lid 1 of this embodiment is a lid for a resin storage container (trough) 10. In particular, the lid 1 of this embodiment is preferably used to close an opening in a storage container body 4 that has an opening at the upper end 43, 43' and an internal space H below the opening. Here, the storage container body 4 has an internal space H capable of accommodating a cable 5 or the like, and has openings at the upper end 43, 43', and this opening is closed by the lid 1.

The container body 4 can be used as a container for storing cables 5, such as communication lines, low-voltage power lines, and high-voltage power lines, in the internal space H, but is not limited to this. The container body 4 has a concave shape when viewed in a cross section perpendicular to the extension direction X, for example.

The storage container body 4 has a bottom wall 41 and opposing side walls 42, 42' that extend upward from both ends of the bottom wall 41, with the upper ends 43, 43' of the side walls 42, 42' being open, so that it is formed like a so-called U-shaped groove. At this time, the groove-like space surrounded by the bottom wall 41 and the side walls 42, 42' becomes the internal space H, and it is possible to store cables 5 and the like in this internal space H. By configuring the storage container body 4 in this way, it is possible to easily store contents such as cables 5 when installing the storage container 10, and to easily perform maintenance of the storage container 10 and its contents.

Here, the bottom wall 41 of the storage container body 4 becomes the bottom surface of the storage container body 4. In addition, both side walls 42, 42' of the storage container body 4 each constitute the side surface of the storage container body 4, and are formed of plate-shaped walls that rise from the bottom wall 41 and extend along the extension direction X. It is preferable that the both side walls 42, 42' are configured to face each other.

The material of the storage container body 4 is preferably made of resin, and in particular, flame-retardant resin. By making the storage container body 4 out of resin, the storage container body 4 can be made lighter, and the storage container 10 can be easily carried when installing or digging up. In addition, since cutting on-site is easier, the storage container 10 can be easily installed in curved sections or sections with varying gradients.

(Storage container)
The storage container (trough) 10 includes the storage container body 4 and the lid 1. More specifically, the storage container body 4 has an internal space H and upper ends 43, 43' are open, and the lid 1 is used to close the opening of the storage container body 4. Here, the lid 1 is configured to include a resin lid body body 2 that constitutes the outer surface 11 of the lid body 1, and a lid reinforcing member 3 that is attached along an inner surface 21 of the lid body body 2 and is fixed to at least both ends 22a, 22b of the inner surface 21 in the width direction Y. In addition, the storage container 10 is preferably configured to accommodate a cable 5 in the internal space H.

As shown in FIG. 5, a plurality of storage containers 10 may be connected along the extension direction X of the storage container 10 to form a storage unit. Here, the plurality of storage containers 10 constituting the storage unit are configured so that the lid body 1 is at least one of the lid body 1 having the lid body reinforcing member 3 attached to the lid body main body 2 and the lid body 1 only constituting the lid body 1. This allows the lid body 1 having the lid body reinforcing member 3 attached and the lid body 1 consisting only of the lid body main body 2 to be used depending on the location where the plurality of storage containers 10 are installed. Therefore, in a location where the lid body 1 is likely to be damaged due to the passage of a vehicle V, the lid body reinforcing member 3 can be attached to reduce damage. At the same time, in a location where there is no passage of a vehicle V and where the lid body 1 is unlikely to be damaged, the lid body 1 consisting only of the lid body main body 2 can be used to reduce the manufacturing cost of the storage container 10 and to facilitate the installation of the storage unit.

In FIG. 5, multiple storage containers 10 are arranged at approximately right angles to the direction of travel of vehicles V and pedestrians P on the paved road 6, but this is not limited to the above. The multiple storage containers 10 constituting a storage unit are arranged consecutively so that their internal spaces communicate with each other along the extension direction X. Inside the multiple storage containers 10, an internal space H is formed that consists of a long and narrow cavity extending in the front-to-rear direction, i.e., in the extension direction X, and that can accommodate long objects such as cables 5.

The storage containers 10 are buried in the ground surface G in such a manner that the outer surface 11 of the lid 1 becomes the walking surface of vehicles V and pedestrians P. Here, the ground surface G on which the storage containers 10 are buried is the walking surface of vehicles V and pedestrians P, and may be, for example, a paved or unpaved road 60. Among these, an example of a paved road is a paved road having a pavement layer 63 mainly made of asphalt and a ground 64 mainly made of soil located in the lower layer, as shown in FIG. 5. Here, an upper layer (not shown) mainly made of sand, stones, etc. may be present between the pavement layer 63 and the ground 64.

By installing multiple storage containers 10 according to this embodiment on the road 60 to form a storage unit, it is possible to make it difficult for the lid body 1 to be damaged by the passage of vehicles V without changing the height of the storage container 10. Therefore, the storage container 10 can be used even when installed on the path of vehicles V. In addition, there is no need to use storage containers made of different materials or shapes, and the strength of the lid body 1 can be selected depending on whether or not the lid body reinforcing member 3 is attached, which reduces the manufacturing cost of the storage container to be installed and also improves the ease of installation of the storage container.

Here, the storage unit is buried in the road so as to be located in the vehicle V's passage 61, the pedestrian P's passage 62, and both the vehicle V's and the pedestrian P's passages. It is preferable that the storage container 10 located in the vehicle V's passage 61 uses the lid body 1 with the lid body reinforcing member 3 attached to the lid body main body 2, and the storage container 10A located in the pedestrian P's passage 62 uses the lid body 1A with only the lid body main body 2. As a result, the lid body 1 with the lid body reinforcing member 3 is used in the vehicle V's passage 61 where the lid body 1 is likely to be damaged, and the lid body 1A with only the lid body main body 2 is used in the pedestrian P's passage 62 where the lid body 1 is unlikely to be damaged. Therefore, the damage of the lid body 1 in the places where the lid body 1 is likely to be damaged is reduced, and the lid body 1A with only the lid body main body 2 is used in the places where the lid body 1 is unlikely to be damaged, thereby reducing the manufacturing cost of the storage containers 10 and 10A and improving the installation workability of the storage containers.

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

(Example of the invention)
The storage container 10 of the present invention is a storage container 10 having a shape and structure shown in FIG. 1, in which the lid 1 has a lid body 2 and a lid reinforcing member 3. Here, the storage container 10 used has an internal space H capable of accommodating the cable 5, and the opening width of the upper end 43, 43' is 200 mm. The lid body 2 is made of a material having a compressive strength of 21 MPa, and the lid reinforcing member 3 is made of a material having a tensile strength of 21 MPa. The bending strength of the material constituting the lid body 2 and the lid reinforcing member 3 is 21 MPa. Among them, the lid body 2 is configured to have a shape that closes the opening of the upper end 43, 43', and is configured so that the thickness from the upper end 43, 43' of the storage container body 4 is 30 mm. Here, the lid body 2 used does not have a protrusion (rib) 23 on the inner surface 21. On the other hand, the lid reinforcing member 3 was configured to have a width of 200 mm, which is the same as the opening width of the upper ends 43, 43', and a thickness of 25 mm. The lid reinforcing member 3 was attached along the inner surface 21 of the lid main body 2 so that the protrusion 31 made of the lid reinforcing member 3 protruded from the lid main body 2.

The bending stress and shear stress of the lid 1 when a load is applied from the outer surface 11 of the lid 1 so as to overlap the entire opening of the upper ends 43, 43' were calculated using the beam strain calculation formula and Hooke's law. As a result, the lid 1 used in the storage container 10 of the present invention had a bending stress of 7.0 MPa and a shear stress of 3.5 MPa, both of which were within the allowable range.

(Comparative Example 1)
The storage container of Comparative Example 1 was constructed with only the lid body without using a lid reinforcing member. The lid body was constructed so that the thickness from the upper end of the storage container body was 55 mm. Other than that, it was manufactured to have the same configuration as the storage container of the present invention. The lid used in the storage container of Comparative Example 1 had a bending stress of 23.0 MPa and a shear stress of 3.5 MPa, which was inferior in bending stress.

(Comparative Example 2)
The storage container of Comparative Example 2 was constructed with only the lid body without using a lid reinforcing member. Otherwise, it was manufactured to have the same configuration as the storage container of the present invention. That is, the lid body has a thickness of 30 mm from the upper end of the storage container body. The lid used in the storage container of Comparative Example 2 had a bending stress of 7.0 MPa and a shear stress of 1.9 MPa, both of which were acceptable, but the shear stress value was smaller than necessary, and when the storage unit was constructed, the height position of the upper surface was different, resulting in a step.

1, 1A Lid 10, 10A Storage container 2 Lid body 21 Inner surface of lid body 22 Both ends in width direction of inner surface 23 Convex portion (rib)
[0033] 3 Lid reinforcing member 31 Protruding portion of lid reinforcing member 4 Storage container body 41 Bottom wall 42, 42' Both side walls 43, 43' Top end of storage container body 5 Cable 6 Paved road 60 Road 61 Vehicle path 62 Pedestrian path 63 Paving layer 64 Ground L Load C Compressive stress S Tensile stress G Ground surface P Pedestrian V Vehicle X Extension direction of storage container Y Width direction of storage container Z Height direction of storage container

Claims (8)

A resin-made storage container lid including a storage container body and a lid,
A lid body that constitutes an upper surface, which is an outer surface of the storage container;
a lid reinforcing member attached along an inner surface of the lid body and fixed to at least both ends of the inner surface in the width direction;
The lid reinforcing member is configured to receive a portion protruding from an inner surface of the lid body,
The lid body and the lid reinforcing member are configured to be in close contact with each other, and
The lid is used to close an opening in a container body having an internal space below an opening at an upper end thereof,
The lid body is made of a material having a compressive strength of 21 MPa or more,
The lid reinforcing member is made of a material having a higher strength than the lid body,
Furthermore, the strength-reinforcing lid body is characterized in that, by accommodating a convex portion (rib) on the inner side of the lid body main body in the accommodation portion of the lid body reinforcing member, when the lid body main body is subjected to a load applied downward from the top surface of the lid body, the inner surface of the accommodation portion of the lid body reinforcing member restrains the outer peripheral surface (top and side surfaces) of the convex portion (rib) of the lid body main body, thereby suppressing bending deflection of the lid body main body. The lid body is made of a thermoplastic resin material or a recycled resin material,
The lid according to claim 1 , wherein the lid reinforcing member is made of at least one material selected from the group consisting of engineering plastic material, fiber-reinforced plastic material, and metal material. The lid body according to claim 1 or 2, wherein the lid body reinforcing member is made of a material selected to have a tensile strength of 100 MPa or more. The strength-reinforcing lid body according to claim 3, characterized in that the convex portion which is the rib structure of the lid body main body which is accommodated in the lid body reinforcing member is configured to divide the inner surface of the lid body main body into a triangular shape, a square shape, or a honeycomb shape . A container body having an internal space and an open upper end;
a lid body used to close the opening of the storage container body;
A resin container comprising:
The container is configured to accommodate a cable in the interior space,
The lid body is
A lid body that constitutes an upper surface, which is an outer surface of the storage container;
a lid reinforcing member attached along an inner surface of the lid body and fixed to both ends of the lid body in at least a width direction,
The lid reinforcing member is configured to receive a portion protruding from an inner surface of the lid body,
The lid body and the lid reinforcing member are configured to be in close contact with each other, and
The lid body is used to close the opening of a storage container body that has an internal space below an opening at an upper end and is buried so as to be located in a passageway through which vehicles can pass,
The lid body is made of a material having a compressive strength of 21 MPa or more,
The lid reinforcing member is made of a material having a higher strength than the lid body,
Furthermore, the storage container is characterized in that a convex portion (rib) on the inner surface of the lid body main body is accommodated in the accommodation portion of the lid body reinforcing member, so that when the lid body main body is subjected to a load applied downward from the top surface of the lid body, the inner surface of the accommodation portion of the lid body reinforcing member restrains the outer peripheral surface (top and side surfaces) of the convex portion (rib) of the lid body main body, thereby suppressing bending deflection of the lid body main body. A storage unit formed by connecting multiple storage containers according to claim 5 along the extension direction of the storage containers. A method for forming a storage unit according to claim 6, characterized in that at least a portion of the storage unit includes a storage container using a lid body that is the lid body alone. The method for laying a storage unit according to claim 6, characterized in that the storage unit is buried in a road so as to be located in a passageway where vehicles can pass.

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