JP6837794B2 - Seat - Google Patents

Description

The present invention relates to a pedestal that supports an iron lid or the like that closes a manhole.

As shown in FIG. 5, a riser pipe 11 for a manhole is connected to the rainwater storage and infiltration tank 10 which is buried in the ground to prevent the outflow of rainwater, and a pedestal 21 is placed above the riser pipe 11 for manholes. It is buried to support the iron lid 22. Further, the same structure as described above is adopted for underground burial equipment and the like other than the rainwater storage and infiltration tank 10.

The pedestal 21 and the iron lid 22 are used in combination as shown in FIG. The pedestal 21 has a frame shape having a lid support portion 21a for supporting the iron lid 22, an upper opening 21b closed by the iron lid 22, and a lower opening 21c. The iron lid 22 is composed of a disc-shaped lid 22a and a square frame 22b having a groove 22d that engages with a ridge 22c of the lid 22a.

The pedestal 21 is generally made of concrete, but the concrete product is vulnerable to impact load, concentrated load and bending load due to its material characteristics, and cannot be made thin. Therefore, the pedestal 21 that receives a long-term load via the iron lid 22 is desired to have a thick structure in consideration of breakage. For example, the pedestal 21 has been manufactured so as to have a wall thickness of 100 mm or more. In this case, since the mass exceeds 100 kg, it is difficult to install the pedestal 21 only by hand, and there is a problem that the installation cost rises.

On the other hand, plastic products are more resistant to impact loads, concentrated loads, and bending loads than concrete products, so they are generally molded into thin walls and reinforced with ribs. Since a long-term load such as a vehicle or a person passing over the top is applied, there is a risk that the rib will be damaged.

Therefore, Patent Document 1 describes a pedestal made of recycled plastic (PE, PP) or the like having a small specific gravity so as to facilitate installation and withstand a long-term load. This pedestal has a closed inner lid and is placed on a side block, and a protective iron lid that is flush with the ground is placed.

Japanese Patent No. 3804010

However, in ordinary plastics such as recycled plastics, when trying to form a thick wall, tensile stress (shrinkage stress) that causes sink marks is applied to the inside of the resin in the thick part. Further, since the thin-walled portion hardens faster than the thick-walled portion, stress is generated between the thin-walled portion and the thick-walled portion, and the stress appears as a warp. It is difficult to form the table thick.

Further, when the pedestal or the like described in Patent Document 1 is molded from recycled plastic or the like, the specific gravity becomes about 0.91 to 0.98, and when rainwater or the like enters between the pedestal and the ground, the iron lid or the like is used together. There was a risk that it would float up.

Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and is a plastic pedestal capable of easily performing thick forming and preventing the iron lid and the like from rising. The purpose is to provide.

In order to achieve the above object, the present invention has a lid support portion for supporting a lid located above, an upper opening closed by the lid, and a lower portion surrounding the top of a rising pipe buried in the ground. It is a ring-shaped pedestal having an opening, the outer peripheral portion is formed thicker than the inner peripheral portion, and the lid support portion is provided on the upper surface of the inner peripheral portion, and is made of a plastic material containing a reinforcing material. , The specific gravity exceeds 1, the ratio of the maximum thickness in the height direction to the outer diameter is 0.03 or more and 0.15 or less, and the reinforcing material is selected from the group consisting of silica sand, glass fiber, and slag aggregate. and wherein the one or more der Rukoto that.

Since the pedestal of the present invention uses a plastic material containing a reinforcing material and has a simple ring shape, it can be easily formed into a thick wall, and the specific gravity exceeds 1, so that the lid can be prevented from rising. ..

Since the ratio of the maximum thickness in the height direction to the outer diameter of the above pedestal is 0.03 or more and 0.15 or less, a pedestal that can sufficiently withstand a long-term load within a range that can be molded with a plastic material. Can be provided.

The reinforcing material, silica sand, glass fibers, Ru der one or more selected from the group consisting of slag aggregate. It is possible to reduce the manufacturing cost by selecting the input hand easily silica sand.

As described above, according to the present invention, it is possible to provide a plastic pedestal capable of easily performing thick forming and preventing the iron lid and the like from rising.

An embodiment of a pedestal according to the present invention is shown, (a) is a top view, and (b) is a sectional view taken along line AA of (a). The iron lid supported by the pedestal of FIG. 1 is shown, (a) is a top view, and (b) is a sectional view taken along line BB of (a). A state in which the pedestal of FIG. 1 and the iron lid of FIG. 2 are combined is shown, (a) is a top view, and (b) is a sectional view taken along line CC of (a). It is the schematic sectional drawing which shows the installation example of the pedestal which concerns on this invention. It is the schematic sectional drawing which shows the installation example of the conventional pedestal. A state in which a conventional pedestal and an iron lid are combined is shown, (a) is a top view, and (b) is a sectional view taken along line DD of (a).

Next, a mode for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a pedestal according to the present invention, in which the pedestal 1 has a lid support portion 1a for supporting the iron lid 2 shown in FIG. 2 and an upper opening 1b closed by the iron lid 2. And a ring-shaped one having a lower opening 1c, and is molded so that the specific gravity exceeds 1 by a plastic material containing a reinforcing member.

In the seat 1, the outer peripheral portion 1d is formed to be thicker than the inner peripheral portion 1e by the presence of the lid support portion 1a. The thickness (maximum thickness) T of the outer peripheral portion 1d is 0.03 or more and 0.15 or less with respect to the outer diameter D. By setting the maximum thickness T / outer diameter D within this range, it can be easily molded with a plastic material and can sufficiently withstand a long-term load.

In molding the pedestal 1, it is preferable that the pedestal 1 is easily available and the pedestal 1 can be manufactured at low cost, but one or more selected from silica sand, glass fiber, and slag aggregate is used as the reinforcing member to be blended. You can also do it. The pedestal 1 can be formed to be thick by blending these reinforcing materials and forming a simple ring shape. Further, the specific gravity of the pedestal 1 is adjusted to exceed 1 by blending the reinforcing material, and the pedestal 1 is preferably molded to about 1.3.

The iron lid 2 placed on the pedestal 1 is of a general round frame type, and is formed from a disk-shaped lid 2a and a round frame 2b having a groove 2d that engages with a ridge 2c of the lid 2a. Therefore, a knob hole 2e is formed in the lid 2a.

FIG. 3 shows a state in which the seat 1 and the iron lid 2 are combined. By placing the round frame 2b of the iron lid 2 on the lid support portion 1a of the concavely formed pedestal 1 in this way, the entire iron lid 2 can be stably supported.

An installation example of the pedestal 1 having the above configuration is shown in FIG. The seat 1 is arranged in the ground in a state where the rising pipe 11 of the rainwater storage and infiltration tank 10 is surrounded by the lower opening 1c, and the iron lid 2 is supported by the lid support portion 1a.

As described above, according to the present embodiment, the pedestal 1 can be formed to be thick by blending a reinforcing material such as silica sand and making it a simple shape, and the specific gravity exceeds 1. It is also possible to prevent the lid 2 from being lifted.

The configuration of the pedestal 1 described as the above embodiment is only an example, and has a lid support portion 1a for supporting the lid 2 located above and an upper opening 1b closed by the lid 2 and is underground. A ring-shaped pedestal having a lower opening 1c surrounding the top of the rising pipe embedded in the lid, which is made of a plastic material containing a reinforcing material and has a specific gravity of more than 1, and supports the lid. The shape of the part 1a and the like can be changed as appropriate.

Further, in the above embodiment, the case where the pedestal 1 is installed above the rising pipe 11 of the rainwater storage and infiltration tank 10 is illustrated, but the equipment other than the rainwater storage and infiltration tank 10 and the rising pipe connected to the sewer pipe and the like are illustrated. Of course, the seat 1 can also be applied to.

1 Seat 1a Lid support 1b Upper opening 1c Lower opening 1d Outer circumference 1e Inner circumference 2 Iron lid 2a Lid 2b Round frame 2c Protrusion 2d Groove 2e Picking hole 10 Rainwater storage infiltration tank 11 Rise pipe

Claims (1)

A lid support that supports the lid located above,
It has a ring shape with an upper opening closed by the lid and a lower opening surrounding the top of the rising pipe buried in the ground, and the outer peripheral portion is formed thicker than the inner peripheral portion, and the inner peripheral portion is formed. A pedestal having the lid support portion on the upper surface of the portion.
It is made of a plastic material containing a reinforcing material, has a specific gravity of more than 1, and has a ratio of the maximum thickness in the height direction to the outer diameter of 0.03 or more and 0.15 or less. , the seats characterized by one or more der Rukoto selected from the group consisting of slag aggregate.

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