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Manhole covers are often made out of cast iron, concrete or a combination of the two. This makes them inexpensive, strong, and heavy, usually weighing more than 113 kilograms (249 lb) [citation needed]. The weight helps to keep them in place when traffic passes over them, and makes it difficult for unauthorized people without suitable tools to ...
Manhole Cover Municipal Casting. The Buy America Act states that transportation infrastructure projects must be built with iron, steel, and manufactured products in the United States. This relates to highways, bridges, airports, and tunnels funded by federal grants. There are severe penalties for not following the Buy America laws. [2]
Cast metal storm drain grate with Neenah Foundry marking. Neenah Foundry is a manufacturing company in the north central United States, based in Neenah, Wisconsin.The company manufactures cast iron manhole covers, gratings, and similar items for municipal and construction applications.
EJ Group, formerly East Jordan Iron Works, is an American manufacturer of iron products, headquartered in East Jordan, Michigan.The company manufactures and distributes iron construction castings (Municipal castings), fabricated products, composite products, water distribution solutions, and other infrastructure access products for water, sewer, drainage, telecommunications, and utility ...
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 sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...
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