Manhole adjusting extension member

An extension member adapted to be disposed between an open top surface of a base of a manhole or catch basin and a bottom surface of a support frame, said extension member comprising:

• a molded plastic member having a central opening for access therethrough and a shape conforming to an open top surface of a base, and further having outer and inner concentric, spaced-apart, walls having inner and outer surfaces and interconnected by a plurality of partitions radially extending from said inner wall to said outer wall to create a corresponding plurality of pocket spaces, said inner and outer spaced apart walls having a planar support surface extending perpendicularly therebetween, from a lower edge of each said inner and outer spaced apart walls to provide a bottom surface of support, wherein at least one of said inner and outer concentric spaced-apart walls has a height dimension that decreases uniformly from a first height dimension to a second height dimension, said second height dimension being aligned opposite said first height dimension.

An extension member adapted to be disposed between an open top surface of a base of a manhole or catch basin and a bottom surface of a support frame, said extension member comprising:

• a molded plastic member having a central opening for access therethrough and a shape conforming to the open top surface of the base, and further having outer, central, and inner concentric, spaced-apart walls, each wall having inner and outer surfaces and interconnected by a plurality of partitions radially extending from said inner wall to said outer wall to create a corresponding plurality of pocket spaces, wherein at least one of said inner and outer concentric spaced-apart walls has a lower planar support surface extending perpendicularly towards said central wall from a lower edge thereof to provide a bottom surface of support and at least one of said inner and outer concentric spaced-apart walls has an upper planar support surface extending perpendicularly towards said central wall from an upper edge thereof to provide an upper surface of support, said inner wall having an upper and a lower section laterally offset in opposite directions relative to a center section to define an upper and a lower shoulder extending from said center section.

An extension member adapted to be disposed between an open top surface of a base of a manhole or catch basin and a bottom surface of a support frame, said extension member comprising:

• a molded plastic member having a central opening for access therethrough and a shape conforming to an open top surface of a base, and further having outer, central, and inner concentric, spaced-apart walls, each wall having inner and outer surfaces and interconnected by a plurality of partitions radially extending from said inner wall to said outer wall to create a corresponding plurality of pocket spaces, wherein a first planar support surface extends perpendicularly from at least one of a lower and upper edge of said outer wall to said central wall and a second planar support surface extends perpendicularly from at least one of a lower and upper edge of said inner wall to said central wall, to provide planar surfaces of support, said outer wall further having a height dimension that decreases uniformly from a first height dimension associated with a first side of said outer wall to a second height dimension associated with a second side of said outer wall aligned opposite said first side.

An extension member adapted to be disposed between an open top surface of a base of a manhole or catch basin and a bottom surface of a support frame, said extension member comprising:

• a molded plastic member having a central opening for access therethrough and a shape conforming to an open top surface of a base, and further having outer and inner concentric spaced-apart walls having inner and outer surfaces and interconnected by a plurality of partitions radially extending from said inner wall to said outer wall to create a corresponding plurality of pocket spaces, wherein said molded plastic member has a height dimension that decreases uniformly from a first height dimension to a second height dimension, said second height dimension being aligned opposite said first height dimension.

An extension member adapted to be disposed between an open top surface of a base of a manhole or catch basin and a bottom surface of a support frame, said extension member comprising:

• a molded plastic member having a central opening and a shape conforming to an open top surface of a base, and further having outer and inner concentric spaced-apart walls having inner and outer surfaces and interconnected by a plurality of partitions radially extending from said inner wall to said outer wall to create a corresponding plurality of pocket spaces, said inner wall including a lower annular shoulder extending therefrom, and said molded plastic member having a height dimension that decreases uniformly from a first height dimension to a second height dimension, said second height dimension being aligned opposite said first height dimension.