Composite concrete and plastic manhole system

Details Composite concrete and plastic manhole system Composite concrete and plastic manhole system

1997-09-26

1999-05-11

Smith, Creighton

Static structures (e.g., buildings)

With entrance for persons or objects in horizontal or...

With additional enclosure structure; e.g., manhole

52245, E02D29/14

Patent

active

059015063

ABSTRACT:
A composite manhole unit comprising a plastic inner element and an outer skeletal frame made of a structural material is provided. The plastic inner element is fitted within the skeletal frame, leaving large sections of the plastic inner element exposed. The exposed plastic sections can be readily cut in the field as necessary for attaching inlet and outlet pipes. A plurality of manhole units may be combined and assembled in a stacked manner to form a manhole system. The plastic pipe sections are sealed or connected to each other in a water-tight manner while the skeletal frame of the respective manhole units rest upon each other. The skeletal frame provides the structural support for the manhole unit and system. The excessive weight of the system and each respective manhole unit is reduced by using the skeletal frame in combination with the plastic inner element. The plastic inner element protects the skeletal frame from the corrosive atmosphere within, for example, a sewer system.

REFERENCES:
patent: 1016506 (1912-02-01), Kretchmer
patent: 3715958 (1973-02-01), Crawford et al.
patent: 3938285 (1976-02-01), Gilbu
patent: 3974599 (1976-08-01), Grosh
patent: 4089139 (1978-05-01), Moffa et al.
patent: 4540310 (1985-09-01), Ditcher et al.
patent: 5383311 (1995-01-01), Strickland
patent: 5386669 (1995-02-01), Almeida

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