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  2. Manhole - Wikipedia

    en.wikipedia.org/wiki/Manhole

    A manhole (utility hole, maintenance hole, [1] or sewer hole) is an opening to a confined space such as a shaft, utility vault, or large vessel. Manholes, typically protected by a manhole cover , are often used as an access point for an underground public utility , allowing inspection, maintenance, and system upgrades.

  3. Manhole cover - Wikipedia

    en.wikipedia.org/wiki/Manhole_cover

    A manhole cover was accidentally launched from its shaft during an underground nuclear test in 1957. During the Operation Plumbbob nuclear tests, a 900-kilogram (1,984 lb) steel plate cap was blasted off the test shaft at an unknown speed and appeared as a blur on a single frame of film of the test. It was never recovered, but it likely burned ...

  4. Sanitary manhole - Wikipedia

    en.wikipedia.org/wiki/Sanitary_manhole

    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 ...

  5. Precast concrete lifting anchor system - Wikipedia

    en.wikipedia.org/wiki/Precast_concrete_lifting...

    The configuration (size, position and quantity) of this reinforcement should be supplemented to the element reinforcement design to ensure for adequate capacity of the lifting design. Lifting design is influenced by the steel / concrete interaction of the specific anchor selected. Different load cases are considered by the lifting design ...

  6. Packaged metering manhole - Wikipedia

    en.wikipedia.org/wiki/Packaged_Metering_Manhole

    Packaged metering manhole factories integrate a primary device (typically a flume [1] or weir [2]) into a fiberglass manhole. The result is a lightweight, single-piece (generally), corrosion resistant structure from which an operator can measure piped flows, take composite samples, and perform water quality parameter monitoring.

  7. Croydon Sewer Vent - Wikipedia

    en.wikipedia.org/wiki/Croydon_Sewer_Vent

    There is neoclassical consoles brackets at the top of the shaft underneath a projecting cornice. The pedestal would be approximately 6m high. A steel entrance door is on the eastern elevation below a rendered hood mould over the door. A galvanised corrugated iron shed is located a metre to the north of this vent stack over the manhole to the ...