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Methods-for-forming-inverts-in-manhold-assemblies

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Methods for forming inverts in manhold assemblies

Details

Inventors: Ditcher, Jack;
Assignee: A-LOK Products Corporation (Tullytown, PA)
Primary Examiner: Silbaugh; Jan H.
Assistant Examiner: Kutach; Karen D.
Attorney, Agent or Firm: Weinstein; Louis

In a method for forming inverts in a manhole base using a two pour technique, the manhole base is initially formed. Thereafter, channel invert forms are aligned with sidewall openings by alignment members arranged within the manhole openings to assure precise alignment therebetween, wherein the invert formed within the manhole base by pouring the casting material into the base member is in precise alignment with associated sidewall openings. The apparatus for the two pour technique incorporates at least one adjustably positionable channel-forming assembly for forming an invert communicating between associated sidewall openings each having a central axis and whose intersecting central axes define an angle different from 180.degree.. In one arrangement, flexible members join the ends of the invert form. Alignment members on the inverts and a flexible internal member, either alone, or in cooperation with a joining bar and clamp, assure precise alignment between the channel-shaped projections forming the invert and prevent flotation of the invert form during casting.

DETAILED DESCRIPTION OF THE INVENTION FIG.
1 shows an exploded perspective view of the molding apparatus 10 employed for forming a manhole assembly base member in accordance with the single pour technique.
The molding apparatus 10 is comprised of a disc-shaped member 22 having an outermost periphery 22a adapted to be received within the interior of the lower edge of sidewall 12a of the outer cylindrical mold member 12.
The outer cylindrical mold member 12 defines the exterior wall of the manhole base.
The manhole base is cast "upsidedown" as will be described in detail hereinbelow.
Outer cylindrical mold member 12 is provided with a pair of collars 15, 15 swingably mounted to the exterior of outer cylindrical mold member 12 by fastening pins 13, 13.
Collars 15, 15 are each provided with a short section of chain 15a, 15a to receive hooks (not shown) from an overhead crane, for example, for lifting and rotating the molding apparatus 10 as will be more fully described.
Cylindrical shaped inner mold member 18 is provided with a hinge assembly 19 for respectively increasing or reducing the diameter of the cylindrical inner mold member 18 for a purpose to be more fully described.
The hinge assembly 19 is initially arranged to increase the diameter of the cylindrical inner mold member to properly position member 18 upon member 22, so that the cylindrical periphery 22e extends into the interior of mold member 18 and engages the inner periphery thereto, whereby lower edge 18a rests upon surface 22d of member 22.
The wire reinforcement frame 20 is arranged between inner mold member 18 and outer mold member 12 so that its lower edge rests upon surface 22d.
Frame 20 is comprised of a plurality of vertically arranged wires 20a and horizontally aligned circular-shaped wire loops 20b which define the wire frame 20 to form a reinforcing frame which is molded into the interior of the cast manhole base, as will be more fully described.
The wire frame 20 is bent to form openings 20c and 20d for receiving the gasket retainer assemblies 16, 16

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