JPS5920826B2 - Rainwater inflow prevention structure on the lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a cover for blocking a vertical hole that communicates with a manhole for water supply, sewage, electricity, telecommunications, gas, etc., and a subterranean structure thereof. It relates to the structure of the lid that prevents inflow.

Conventionally, this type of lid has several communication holes in order to allow the atmosphere and gas in a vertical hole such as a manhole to circulate, or to prevent the generation of abnormal pressure in the gas in a vertical hole such as a manhole, but this structure Rainwater flows into the lid through these communication holes and flows into the sewer pipes etc. from vertical holes such as manholes installed in urban areas, increasing the flow rate of sewage treatment and causing the capacity of the treatment plant to be exceeded. The disadvantage is that it can damage things.

In order to eliminate these drawbacks, if the lid is completely sealed,
There is no air circulation between the gas inside the vertical hole such as the manhole and the outside air, causing problems such as harmful gases remaining in the vertical hole and abnormal gas pressure occurring inside the manhole or vertical hole.

In order to solve these drawbacks and problems, the present applicant has provided a float chamber and a float valve below the cover hole, and raised the float valve by introducing some or all of the rainwater from the circling into the float chamber. Japanese Patent Laid-Open No. 56-52229 discloses a structure for preventing rainwater from entering with a lid that closes the hole.

The present invention further improves the float valve to more completely and reliably close the lid hole.

This invention includes a float valve 3 below the communication hole 2 of the lid 1 that opens and closes the communication hole 2 or a communication path following the communication hole 2, and a float valve 3 that opens and closes the communication hole 2 or a communication passage connected to the communication hole 2. It has a structure that introduces rainwater, and a drainage hole 5 is provided at the bottom of the float chamber 4, and a valve body 6 for opening and closing the drainage hole 5 is arranged outside the float chamber 4 of the drainage hole 5, and the valve body 6 and the float The bottom of the valve 3 is connected by a connecting member 7, and the valve structure 20 consisting of the opening/closing valve body 6 and the connecting member 7 is configured to be expandable and retractable so that it is always in an open state,
This invention relates to a rainwater inflow prevention structure of a lid that closes the valve body when rainwater flows in.

This will be explained below using examples.

The first to third embodiments show examples in which the connecting member of the valve structure is made expandable and retractable, and the fourth embodiment shows an example in which the valve element itself in the valve structure is made extendable and retractable.

First Embodiment The first embodiment shown in FIGS. 1 and 2 is an example in which a stretchable elastic body is used as a valve structure for both the connecting member and the valve body.

In the figure, 1 is a lid, 2 is a communication hole, 3 is a float valve, 4 is a float chamber, 5 is a drainage hole, 6 is a valve body made of an elastic body such as rubber,
7 is a connecting member made of an elastic material such as rubber; 8 is an inlet wall made of synthetic resin; 9 is a rainwater introduction hole; 10
1 is a soft gasket made of rubber or soft resin on the inner wall of the rainwater introduction hole; 11 is a flange of the float valve 3 for introducing a portion of rainwater into the float chamber 4; 12 is a spacing retaining protrusion; 13
14 is a filtration filter that prevents coarse-grained earth and sand from flowing into the float chamber; 14 is a fixing material for the filter; and 15 is a rainwater dripping groove formed in the valve body 6 in the float chamber.

In this embodiment, under normal conditions (sunny weather) with no inflow of rainwater, the float valve 3 is in a state of sinking into the float chamber 4 due to its own weight, and there is a gap between the top surface of the float valve 3 and the inlet channel wall 8. An air flow path is formed in the space formed by the rainwater introduction hole 9 and the communication hole 2, and the vertical hole communicates with the atmosphere through this air flow path, allowing air to circulate and removing harmful gases within the vertical hole. It is possible to prevent the accumulation of harmful gases by dispersing them into the atmosphere, and also to prevent the generation of abnormal gas pressure in vertical holes such as manholes.

Next, when rainwater flows in from the communication hole 2 and the rainwater introduction hole 9, the rainwater reaches the flange 11 along the top surface of the float valve 3, and flows into the float chamber 4 along the sloped surface (back surface). It will flow in and flow out from the drain hole 5 at the bottom of the float chamber 4.

If the amount of water flowing into the float chamber 4 becomes larger than the amount of water discharged from the drain hole 5, the water level in the float chamber 4 rises, the float valve 3 rises due to its buoyancy, and the valve body 6 first drains water. The lower opening of hole 5 is closed.

If rainwater continues to flow in from the rainwater introduction hole 9 at this stage, that is, if the upper surface of the float valve 3 is connected to the soft packing 10 of the rainwater introduction hole 9
If the valve is not completely closed by pressure contact, rainwater will continue to be introduced into the float chamber 4 and further buoyancy will act on the float valve 3.Moreover, since the connecting member 7 is made of an elastic material such as rubber, the buoyancy will cause the The float valve 3 further rises.

Then, the upper surface of the float valve 3 is pressed against the lower end opening of the soft hook 10 to completely close the rainwater introduction hole 9 and prevent rainwater from flowing in.

Also, when the amount of rainfall temporarily decreases and the water level above the lid falls, the water level in the float chamber 4 is gradually drained from the rainwater dripping groove 15 of the valve body 6 and lowers, causing the 70-tooth valve 3 to descend and the soft gasket 10 to drop.
occlusion becomes incomplete.

However, when the amount of rainfall increases again and the water level above the lid rises, the blockage becomes incomplete and rainwater flows in through the rainwater introduction hole 9, and a portion of the water flows into the float chamber 4 and raises the float valve 3. Then, the soft packing 10 is pressed and the lower end opening of the soft packing 10 is completely closed.

In this way, the closed state of the float valve 3 is self-maintained.

As mentioned above, if it is raining, the float valve 3 should be
is raised to close the opening at the lower end of the soft packing 10 and prevent rainwater from flowing into the inside of the lid.

Next, when the rain stops, the water in the float chamber 4 is discharged from the rainwater dripping groove 15 of the valve body 6, and the water level gradually decreases. The blockage is broken, and as a result, the accumulated water in the float chamber 4 is rapidly discharged from the drain hole 5 into the vertical hole.

At the same time, the lower end opening of the rainwater introduction hole 9 is no longer blocked by the upper surface of the float valve 3, and the outside of the lid and the inside of the lid are communicated through the communication hole 2 and the rainwater introduction hole 9.

Incidentally, the rainwater dripping groove 15 may be bored in the wall of the float chamber 40, or may not be provided and may rely on natural evaporation.

Second Embodiment In the second embodiment shown in FIG. 3, the valve body 6 is made of a conical sealing material, and a protective tube a
The valve body 6 of the conical sealing material is fixed to the lower end of the spring b enclosed in the spring b.

The other configurations are the same as in the first embodiment, and the effects are also the same as in the first embodiment, except that the connecting member 7 is expanded by the tension of the spring b.

Third Embodiment The third embodiment shown in FIG. 4 shows an example in which a spring d is provided in the bottom partition space C of the float valve 3 as the expandable and contractible connecting member 7.

In this example, as the water level in the float chamber 4 rises,
The conical valve body 6 attached to the lower end of the connecting member 7 is connected to the drain hole 5.
Even if the lower end opening is closed, the float valve 3 can still rise somewhat due to its buoyancy against the spring force of the spring d.
Therefore, the lower end opening of the soft packing 10 is completely closed by the upper surface of the float valve 3 to prevent rainwater from entering.

The other features are the same as those of the first embodiment.

Fourth Embodiment The fourth embodiment shown in FIG. 5 shows an example in which the valve body 16 is made of a swelling material to make the valve structure 20 expandable and retractable.

The valve body 16 is attached to the bottom of the float valve 3 by a rigid connecting rod 17 in a normally open state.

Along with the water level in the float chamber 4, the float valve 3 and the valve body 16
rises, and as the valve body 16 comes into contact with rainwater, it expands greatly and closes the drain hole 5.

Also, the valve body 16 becomes increasingly soft due to expansion, and the float valve 3
The lower end opening of the soft packing 10 is pressed against the upper surface of the float valve 3 to completely block the inflow of rainwater, and when it rains, the accumulated water in the float chamber 4 is drained into the float chamber. Rainwater is dripped and discharged from a dripping groove 15 provided at the bottom of 4.

Other configurations and effects are similar to those of the first embodiment.

Although the above embodiments have shown examples in which either the connecting member or the valve body of the valve structure 20 is expandable and retractable, it is of course obvious that both can be configured to be expandable and retractable.

According to the present invention, when the sky is clear or there is no rainwater inflow,
The inside of the lid communicates with the atmosphere through the communication hole 3, allowing air to flow to the manhole vertical hole inside the lid, preventing harmful gases from stagnation in the vertical hole, and preventing abnormal gases generated in the manhole vertical hole inside the lid. When the pressure is discharged and rainwater starts to flow in, the float valve 3 is activated to close the communication hole 2 through which the rainwater flows, and the connecting member 7, which can be expanded and contracted, or the valve body 16 made of a swellable material, is operated. By this function, an excellent effect of completely and reliably closing the float valve 3 can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of a rainwater inflow prevention structure for a lid according to the present invention, FIG. 2 is a plan view of an inflow channel wall of the same embodiment, and FIG. 3 is a second embodiment. Longitudinal cross-sectional view, Figure 4 is the 3rd
FIG. 5 is a longitudinal sectional view showing the fourth embodiment. 1...Lid, 2...Communication hole, 3...
...Float valve, 4...Float chamber, 5...
... Drain hole, 6 ... Valve body, 7 ... Connection member, 8 ... Inflow channel wall, 9 ... Rainwater introduction hole, 20. ...Valve component.

Claims (1)

[Claims] 1 Below the communication hole 2 of the lid 1, the same communication hole 2 or the same communication hole 2
The float valve 3 is equipped with a float valve 3 that opens and closes a communication passage leading to the float chamber 4 of the float valve 3, and has a structure that introduces rainwater from the communication hole 2 into the float chamber 4 of the float valve 3. A drainage hole 5 is provided at the bottom of the float chamber 4. 5 is disposed outside the float chamber 4 of the drain hole 5, and the valve body 6 and the bottom of the float valve 3 are connected in a normally open state by a connecting member 7. A valve structure 20 consisting of a body 6 and the connecting member 7
A lid structure that prevents rainwater from flowing in, characterized by a structure that is expandable and retractable.