Static molds – In situ construction engineering type or building type-mold... – Forming hydraulic and earth control type product in situ
Patent
1980-03-03
1981-04-14
Hoag, W. E.
Static molds
In situ construction engineering type or building type-mold...
Forming hydraulic and earth control type product in situ
249163, 249169, 249177, 264 32, 403294, 405153, 425 59, B28B 716, B29C 114
Patent
active
042615410
ABSTRACT:
An improved manhole concrete blockout for forming sewer pipe openings in the cast-concrete wall of a manhole where a hole is dug in the ground and at least one vertical hollow form is positioned within the hole and spaced apart from the surface which defines the hole and concrete is poured between the surface defining the hole and the form for forming a manhole wall. A plurality of form sections are connected together so that their outer surfaces can be positioned to become a longitudinal extension of the outer surface of the form. A blockout member is connected to the outer surface of at least one of the sections for forming an opening in the manhole wall, the end adjacent to the section being shaped to engage and conform to the outer surface of the section and the other end being shaped to conform to and engage the corresponding portion of the surface defining the hole so that an opening in the shape of the blockout member will extend through the wall when it is formed. The outer surface of the blockout member gradually decreases in cross-section away from the section, and the sections are disconnectable so that when the wall is formed the sections can be removed individually inwardly so that the blockout member can be withdrawn from the opening formed in the wall.
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patent: 3729165 (1973-04-01), Trimble
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