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Manhole base assembly with internal liner and method of manufacturing same

  • US 10,428,512 B2
  • Filed: 01/10/2019
  • Issued: 10/01/2019
  • Est. Priority Date: 11/20/2014
  • Status: Active Grant
First Claim
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1. A pre-casting assembly for production of a manhole base assembly having a cast base, the pre-casting assembly comprising:

  • a liner comprising;

    an entry aperture defining an entry aperture diameter;

    a first side wall having a first pipe aperture sized and positioned to be aligned with a first side opening of the cast base;

    a second side wall having a second pipe aperture sized and positioned to be aligned with a second side opening of the cast base;

    a liner top wall disposed radially outwardly of said entry aperture diameter and extending between said entry aperture and said first side wall; and

    a flow channel extending between said first and second pipe apertures and in fluid communication with the entry aperture;

    a plurality of aperture supports sized to fit in the first pipe aperture and the second pipe aperture respectively;

    a first forming plate secured to one of the plurality of aperture supports and adjacent to the first pipe aperture, the first forming plate having a back edge and an opposing front edge;

    a second forming plate secured to another one of the plurality of aperture supports and adjacent to the second pipe aperture, the second forming plate having a back edge and an opposing front edge;

    a back wall extending partially around the liner from the back edge of the first forming plate to the back edge of the second forming plate; and

    a front wall extending partially around the liner from the front edge of the first forming plate to the front edge of the second forming plate,the first forming plate, the second forming plate, the back wall, the front wall and the liner forming a concrete forming cavity, the liner received in the concrete forming cavity with the entry aperture forming an open upper end of the pre-casting assembly.

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