JPS5855298B2 - Rainwater inflow prevention structure for manhole covers, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a lid for closing on the ground surface a vertical hole communicating with a manhole or other underground structure for water supply, sewage, electric power telecommunications, or gas. The present invention relates to a structure for preventing rainwater from flowing in from the lid, and at the same time, preventing earth and sand flowing in from the communication hole of the lid together with the rainwater from adhering to and accumulating on the structural parts attached to the lid.

In order to prevent the accumulation of harmful gases by communicating the gas in underground vertical holes such as manholes with the atmosphere, and to prevent the generation of abnormal pressure in vertical holes such as manholes, several caps are installed on the lids that are normally blocked on the ground surface. A communication hole (gas hole) is provided in the lid, but a large amount of rainwater flows in through the communication hole in the lid, passes through vertical holes such as manholes, and flows into sewer pipes or other underground structures, and is not used for sewage treatment. Capacity may be exceeded or underground structures may be damaged.

If the lid is completely sealed to eliminate such drawbacks, there will be no communication between the gas inside the manhole or other vertical hole and the outside air, which may cause harmful gases to stagnate or abnormal pressure to occur inside the vertical hole. .

In order to solve these drawbacks and problems, the present applicant provided a float chamber 4 and a float valve 3 below the cover hole, introduced some or all of the rainwater from the circling into the float chamber 4, and installed a float chamber 4 and a float valve 3 below the cover hole. Invented a rainwater inflow prevention structure with a lid that allows the introduced rainwater to rise and close the hole, and patent application 128708/1986
The application has already been filed as a No.

The present invention prevents soil and sand mixed in rainwater in the float chamber from adhering to the bottom of the float chamber 4, the side of its sloped inner wall, and the sloped lower surface of the float valve 3. This has been further improved so as not to reduce the function of the float valve 3 or to prevent the float valve 3 from moving up and down.

The gist of this invention is to provide a float valve 3 for opening and closing the communication hole or a communication passage connected to the communication hole below the communication hole 2 of a cover 1 of a manhole or the like, and a float chamber 4 for housing the float valve. A structure for preventing rainwater from flowing into a cover of a manhole or the like, characterized in that rainwater flowing in through a communication hole is introduced into the float chamber 4, and a one-pass filter is attached to the rainwater inlet of the float chamber. be.

Examples will be described below with reference to the drawings.

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 drain hole of the float chamber, 6 is a valve body made of an elastic body such as rubber, and 76 is also made of a rubber elastic body. Reference numeral 8 indicates an inflow channel wall made of synthetic resin or the like, 9 indicates a rainwater introduction hole formed by the inflow channel wall 8 following the communication hole 2, and 10 indicates a connecting member attached to the inner wall of the rainwater introduction hole; is a cylindrical soft packing that protrudes from the rainwater introduction hole 9 and has a pointed shape, 11 is the collar of the float valve 3 for introducing a portion of rainwater into the float chamber 4, 12 is a spacing retaining protrusion, and 13 is a large particle size A filtration filter for preventing earth and sand from flowing into the float chamber, 14 is a filter fixing material, and 15 is a rainwater dripping groove for the float chamber formed in the valve body 6.

The material of the soft packing 10 is durable rubber or other soft synthetic resin, and when its tip is pressed against the upper surface of the float valve 3, it bends inwardly or outwardly, and when it is further pressed, the lower part protrudes. It is preferable that the part buckles in the middle.

The filter 13 may be a fine mesh wire mesh or a synthetic resin paper, and is not limited to these.

In addition, the f-applicable filter 13 is attached to the entire periphery of the float chamber 4, which is the rainwater inlet, in the shape of ) or ], and the filter fixing material 14 is attached to the filter 13.
Both ends are cut out, pressed and glued to secure.

Rainwater and dirt flow out from the missing parts of the filter fixing material at both ends of the filter 13 and flow down into vertical holes such as manholes (see Figure 4).

In this embodiment, under normal conditions (sunny weather) when rainwater flows in for a long time, the float valve 3 is in a state of sinking into the float chamber 4 due to its own weight, and the upper surface of the float valve 3 and the inlet channel wall 8
An air flow path is formed by the space formed between the rainwater introduction hole 9 and the communication hole 2, and this air flow path allows communication between the inside of a vertical hole such as a manhole and the atmosphere.
It is possible to prevent the accumulation of harmful gas within the vertical hole, and also to prevent the generation of abnormal gas pressure within the vertical hole.

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

Rainwater introduced into the float chamber 4 is filtered through a filter 13.
When passing through the float valve 3, the relatively coarse-grained earth and sand are left on the slope of the shape filter 13, are immediately washed away by the stream of rainwater flowing along the top surface of the float valve 3, and are deposited on the slope of the shape filter 13. Most of the extremely fine sand particles that have passed through the filter 13 are discharged from the drain hole 5 together with rainwater, and do not accumulate in the float chamber 4.

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

If rainwater continues to flow in from the rainwater introduction hole 9 at this stage, the float valve 3 will continue to rise further, and the upper surface of the float valve 3 will finally press the tip of the soft packing 10, pushing the tip inward or outward. Make it bend.

As a result, the tip of the soft packing 10 and the float valve 3
Increase watertightness with the top surface.

At the same time, the tip of the soft packing 10 is inserted into the layer of sediment that has adhered to and accumulated on the top surface of the float valve 3, and by bending it, it can easily divide the layer of sediment or cause it to slide, allowing it to flow out together with rainwater. It's tight.

Furthermore, when there are multiple communication holes 2, it is extremely difficult for the float valve 3 to simultaneously close the lower end openings of the rainwater introduction holes 9 of all the communication paths in a watertight manner due to manufacturing accuracy and assembly errors. However, by forming the tip-shaped soft packing 10 into the press-contact portion around the opening, the soft packing 10 is bent and buckled, thereby making it possible to close the lower end openings of all the soft packings 10 at the same time.

Among these, the connecting member 7 of the valve body 6 in the embodiment may be made of a spring instead of an elastic material such as rubber, or may be a ball valve placed on the bottom of the float chamber 4, or may be a ball valve placed on the bottom of the float chamber 4. There is no need for a valve body 6 of any kind, and it is sufficient to simply drill a drainage hole 5 of an appropriate diameter.

As described above, according to the present invention, by adopting the configuration having the above-mentioned characteristics, (i) In the case of clear weather or rainwater inflow, the vertical hole under the lid communicates with the atmosphere through the communication hole 2, and the air circulation in the vertical hole is improved. (11) When rainwater starts flowing in, the float valve 3 automatically operates to open the communication hole 2. Since the stream application filter 13 is installed at the rainwater inlet of the float chamber 4, the accumulation of sediment in the float chamber becomes longer, and the sediment is trapped in the float valve 3. It may obstruct the movement of the float, or the drain hole 5 of the float chamber 4, the rainwater dripping groove 1.
This prevents the loss of 50 functions.

This excellent effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the structure for preventing rainwater inflow of a manhole cover according to the present invention, Fig. 2 is a plan view showing an inflow channel wall of the same embodiment, and Fig. 3 is Fig. 1-1. A cross-sectional view along the line, FIG. 4 is an explanatory view showing the main parts. 1: Lid, 2: Communication hole, 3: Float valve, 4: Float chamber, 5: Drain hole, 6: Valve body, 7: Connecting member, 8: Inflow channel wall, 9: Rainwater introduction hole, 10: Soft packing , 13: Filter for filtration, 14: Filter fixing material.

Claims (1)

[Claims] 1. A float valve 3 for opening and closing the communication hole or a communication passage connected to the communication hole and a float chamber 4 for housing the float valve are provided below the communication hole 2 of the cover 1 of the manhole, etc., and water flows through the communication hole. A structure for preventing rainwater from flowing into a cover of a manhole or the like, characterized in that rainwater is introduced into the float chamber 4, and a one-pass filter 13 is attached to the rainwater inlet of the float chamber.