Precast manhole invert forming

Details Precast manhole invert forming Precast manhole invert forming

1993-11-22

1995-05-09

Woo, Jay H.

Static molds

In situ construction engineering type or building type-mold...

Forming hydraulic and earth control type product in situ

294551, 249145, 249176, 264219, B28B 728, B28B 2186

Patent

active

054133076

ABSTRACT:
A mold for casting an inverted base section of a manhole includes a core for forming an inner surface of the base section, and a jacket surrounding the core for forming an outer surface of the base section. A domed plate atop the core but below an upper edge of the jacket, and having a peripheral shape corresponding to that of the core, seals off the interior of the core and produces the floor shape of the base section. A trough former is placed between opposite interior sides of the jacket and above the domed plate. The flanges of the trough former are cut along arcs conforming to the shape of the domed plate so that cementitious material poured into the mold does not leak between the domed plate and the trough former. Hole formers are similarly seated atop the trough former.

REFERENCES:
patent: 3363876 (1968-01-01), Moore
patent: 3958313 (1976-05-01), Rossborough
patent: 4177229 (1979-12-01), Moore
patent: 4318880 (1982-03-01), McIntosh et al.
patent: 4427619 (1984-01-01), Peterson
patent: 4565347 (1986-01-01), Ditcher
patent: 4685650 (1987-08-01), Ditcher
patent: 4867411 (1989-09-01), Dorsey et al.
patent: 4941643 (1990-07-01), Ditcher

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