Method of constructing concrete manholes having sealed joints with pipes connected thereto

Claim 1

In the method of constructing concrete manholes or the like to provide a sealing surface for effectuating a sealed pipe joint with the manhole wall wherein the manholes are formed within a strippable form the improvement comprising the steps of: securing to the inner surface of the form a frusto-conical plug with its base against the form and its top projecting to the inner surface wall line of the manhole to be formed, forming the concrete manhole within the form, releasing the plug from the form and stripping the form from the manhole wall, removing the plug from the formed manhole wall by extracting it from the exterior of the manhole, forming an adapter ring having a bevelled exterior diameter matching the bevel aperture formed by the plug in the manhole wall and having an internal bevelled diameter providing a sealing surface sized to closely embrace a pipe to be connected to the manhole, and inserting and sealing the adapter ring in the manhole aperture formed by the plug.

Claim 6

The method of constructing sealed joints between pipes and underground manhole walls or the like comprising: forming manholes with uniform diameter apertures through the walls thereof for receiving therein adapter rings, forming adapter rings having in common an external diameter and configuration to be secured and sealed in the manhole wall apertures and having selected internal diameters to accommodate selected pipe diameters, during formation of the adapter rings providing an internal bevelled surface extending axially and radially outwardly to face interiorly of a manhole when the ring is secured and sealed in the aperture thereof, securing and sealing in the manhole apertures the formed adapter rings having internal diameters adapted for sealing with the diameter of pipe to be joined to the manhole, installing the manholes in the ground, laying pipe in a trench outside the manhole and projecting an end of the pipe through the adapter ring, positioning a resilient gasket about the end of thE pipe projecting interiorly of the manhole, and urging the gasket from within the manhole against the inwardly facing bevelled surface of the adapter ring to squeeze the gasket against an opposed surface of the pipe to seal the pipe in the manhole wall.

Claim 7

The method of constructing sealed joints between pipes and underground manhole walls or the like comprising: forming manholes with uniform diameter apertures through the walls thereof for receiving therein adapter rings, forming adapter rings having in common an external diameter and configuration to be secured and sealed in the manhole wall apertures and having selected internal diameters to accommodate selected pipe diameters, during formation of the adapter rings providing an internal bevelled surface extending axially and radially outwardly to face interiorly of a manhole when the ring is secured and sealed in the aperture thereof, securing and sealing in the manhole apertures the formed adapter rings having internal diameters adapted for sealing with the diameter of pipe to be joined to the manhole, installing the manholes in the ground, laying pipe in a trench outside the manhole and projecting an end of the pipe through the adapter ring, positioning a resilient gasket about the end of thE pipe projecting interiorly of the manhole, and urging the gasket from within the manhole against the inwardly facing bevelled surface of the adapter ring to squeeze the gasket against an opposed surface of the pipe to seal the pipe in the manhole wall.

Claim 10

The method of constructing sealed joints between pipes and underground manhole walls or the like comprising: forming manholes with uniform diameter apertures through the walls thereof for receiving therein adapter rings, forming adapter rings having in common an external diameter and configuration to be secured and sealed in the manhole wall apertures and having selected internal diameters to accommodate selected pipe diameters, securing and sealing in the manhole apertures the formed adapter rings having internal diameters adapted for sealing with the diameter of pipe to be joined to the manhole, installing the manholes in the ground, laying pipe in a trench outside the manhole and projecting an end of the pipe through the adapter ring, and from within the manhole effecting an annular seal between the pipe and the adapter ring through the annular space between the internal bevelled surface of the ring and the confronting surface of the pipe.

Claim 11

The method of constructing sealed joints between pipes and underground manhole walls or the like comprising: forming manholes with uniform diameter apertures through the walls thereof for receiving therein adapter rings, forming adapter rings having in common an external diameter and configuration to be secured and sealed in the manhole wall apertures and having selected internal diameters to accommodate selected pipe diameters, securing and sealing in the manhole apertures the formed adapter rings having internal diameters adapted for sealing with the diameter of pipe to be joined to the manhole, installing the manholes in the ground, laying pipe in a trench outside the manhole and projecting an end of the pipe through the adapter ring, and from within the manhole effecting an annular seal between the pipe and the adapter ring through the annular space between the internal bevelled surface of the ring and the confronting surface of the pipe.