초록 ▼

A hole former assembly used to form a reusable hole former assembly used during the construction of a manhole base. The hole former assembly of the present invention aligns the center of the formed hole in the concrete manhole base sidewall with the center of an inlet or outlet opening of a canal be

A hole former assembly used to form a reusable hole former assembly used during the construction of a manhole base. The hole former assembly of the present invention aligns the center of the formed hole in the concrete manhole base sidewall with the center of an inlet or outlet opening of a canal bed liner embedded in the base of the manhole. The hole former assembly is suitable for use in either wet casting or dry casting the base of the manhole with the inlet and/or outlet of the invert embedded in a sidewall of the base of the manhole. Several of the component parts of the hole former assembly of the present invention may be molded as a single unit and thereafter separated, thereby reducing certain manufacturing costs of the component parts.

대표청구항 ▼

1. A hole former assembly for forming a hole in a concrete sidewall during casting, wherein a portion of a gasket is embedded in the cured concrete inside the formed hole, said hole former comprising:a first annular member; a second annular member; an invert alignment member adapted for engagement w

1. A hole former assembly for forming a hole in a concrete sidewall during casting, wherein a portion of a gasket is embedded in the cured concrete inside the formed hole, said hole former comprising:a first annular member; a second annular member; an invert alignment member adapted for engagement with said first annular member, wherein said invert alignment member is adapted to engage at least one of an inlet and outlet of an invert prior to forming said hole; and a clamp that holds together the first annular member, second annular member and the invert alignment member, wherein a gasket may be held in position between the first and second annular members.