JPS5934617Y2 - manhole cover - Google Patents

Description

[Detailed description of the invention] This invention relates to a manhole cover installed in a sewer system or the like.

Conventionally, manhole covers installed in sewers, etc., have been used with exhaust holes because organic matter in the sewage rots and ferments due to stagnation of sewage, producing methane gas, carbon dioxide gas, etc.; In order to prevent bad odors from sewage, closed-type lids without vents have come to be used for manholes installed on roads with a lot of foot traffic, such as sidewalks in shopping districts and shopping streets.

However, even in the present day when drainage facilities are fully equipped, there is a lack of exhaust when internal pressure is added due to a temporary increase in flowing water due to rain, or when gas is generated due to decay of organic matter or fermentation due to temporary stagnation of sewage. It is something that cannot be done.

For this reason, as seen in Utility Model Publication No. 50-39972, some designs have been devised in which an inner lid is provided, a ball valve is attached to the inner lid, and when gas etc. is generated, the ball is pushed up and evacuated. Therefore, it is not easy to inspect and clean the inside.
Higher equipment costs were unavoidable.

This invention makes it easier to vent when internal pressure is temporarily applied inside the sewer manhole, and since there is no inner cover, it is easy to inspect and clean the inside, and the cause of gas generation can be easily removed. It provides a cover for the manpole.

To explain the embodiment of the present invention according to the drawings, Fig. 1 is a top view of a manhole cover, and the frame and bottom plate are usually made of cast iron or iron, the same paving material as the road.
They are filled with concrete, etc.), are circular or rectangular, and have a lock hole for removal.

A recess 8 is provided in the center of the lid 1 into which an exhaust valve 2 having a diameter of 5 to 15 cm is fitted, although it varies depending on the size of the manhole.

This recess 8 has a funnel shape as shown in the cross-sectional view of Fig. 2, and has a mounting hole 6 in the center into which the bolt 3 provided on the lower surface of the exhaust valve 2 is inserted, and a plurality of exhaust holes 5 around the mounting hole 6. has been done.

The exhaust valve 2 has an upper surface that is flush with the upper surface of the lid 1, and has a tapered shape so that it fits again without slipping from the recess 8 even after being temporarily lifted by the exhaust gas, and matches the outer periphery of the recess 8. configured to do so.

Furthermore, the exhaust valve 2 is attached with bolts 3 so as not to fall off from the lid 1, but the diameter of the mounting hole 6 is larger than the diameter of the bolt 3 and is large enough to allow the exhaust valve 2 to move up and down easily. A gap a is provided and fixed between the lower surface and a nut 4 attached to the bolt 3 so that when internal pressure is applied, the exhaust valve 2 is pushed up slightly to enable exhaust.

Therefore, in order to prevent the nuts 4 from falling off, it is best to install two nuts as a so-called double nut as shown in the figure.Also, the upper nut may be made of plastic, or a plastic washer may be inserted between it and the lid to prevent it from falling off during exhaust. It is possible to prevent impact noise from occurring.

Further, the exhaust valve 2 can also be made of plastic with good wear resistance.

The weight of the exhaust valve 20 varies depending on its size and material, so it is best to adjust it by adding weight to the nut 4 so that it can be easily exhausted when internal pressure is applied and does not float up and get caught when walking.

Since the present invention is constructed as described above, when internal pressure is applied, the internal gas passes through the exhaust hole 5, pushes up the exhaust valve 2, and is discharged.

Further, since the recess 8 is funnel-shaped, water that has entered under the exhaust valve 2 is discharged to the sewer through the gap between the exhaust hole 5 and the bolt 3 of the mounting hole 6.

In addition, the manhole cover according to the present invention has an exhaust valve 2 and a cover 1.
Manhole covers are manufactured separately from the main body, but conventionally manhole covers have to be marked and manufactured according to the destination municipality or purpose such as water, gas, electricity, etc., which increases the cost of molding. However, by marking the top of the exhaust valve 2, the main body of the lid 1 can be shared with other municipalities and uses, making it possible to mass-produce the exhaust valve. Since only valve 2 needs to be replaced, there is less storage space required, and if the product is used for purposes where there is no risk of internal pressure being applied, the practical effects are great, such as just fixing the exhaust valve and lid tightly together. .

[Brief explanation of the drawing]

FIG. 1 is a top view when the exhaust valve of the embodiment is removed, and FIG. 2 is a longitudinal sectional view when the exhaust valve of the embodiment is installed. 1... Lid (body), 2... Exhaust valve, 3
...Bolt, 4゜4'...Nut, 5
...Exhaust hole, 6...Mounting hole, 7...
...Lock hole, 8...Indentation, a...Gap.

Claims (1)

[Scope of utility model registration request] A funnel-shaped recess 8 with a plurality of exhaust holes 5 bored around the mounting hole 6 of the exhaust valve 2, which also serves as a mark display board, is provided in the center of the top surface of the lid 1, and the exhaust valve 2 is provided on the top surface. Make a recess 8 so that the mark is displayed and the top surface matches the top surface of the lid 1.
A manhole cover is fitted to the cover 1, and the bolt 3 attached to the lower surface is inserted into the mounting hole 6 and is attached to the cover 1 such that a gap a is created between the lower surface of the cover 1 and the nut 4. .