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A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
Grade adjustment rings can also be used on top of a cone section instead of the chimney section to adjust the frame to the required level. [20] The cover section is the top most section of sanitary manholes. It consists of a frame and a manhole cover. [16] The covers are designed to withstand the loads of the traffic on top of the manholes.
A manhole cover for a sanitary sewer access point. View looking down into an open manhole showing two converging sanitary sewer lines. The larger line enters from the right and changes direction within the manhole to exit from the top of the photo. A smaller line enters from the bottom of the photo under the access steps.
Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...
A round manhole cover cannot fall down the hole because the lip (under the manhole that the cover sits on) is smaller than the cover thus the cover cannot ever fall into the hole. A square or rectangular cover (like a storm drain cover) has the same lip that the cover sits on but it is fairly easy for a cover in the shape other than a round ...
Screwfix Direct Limited, trading as Screwfix, is a retailer of trade tools, accessories and hardware products based in the United Kingdom. [6] Founded in 1979 as the Woodscrew Supply Company, the company was acquired in July 1999 by Kingfisher plc , which also owns B&Q , and is listed on the London Stock Exchange .