Adjustment riser

Details Adjustment riser Adjustment riser

E - Fixed Constructions

02

D

E02D 29/14 (2006.01) E02D 29/12 (2006.01)

Patent

CA 2297283

Adjustment risers for use in a manhole or catch basin, between a lower support structure, for example, a concrete riser, and an upper frame assembly, adjacent a surface in which the hole is formed, have a molded body and typically are annular; one or more ribs extend outwardly from a first sealing face and a corresponding one or more grooves are formed in an opposed second sealing face, each groove being in opposed relationship with a rib, whereby the adjustment risers may be matingly stacked to provide a required adjustment riser height for a specified manhole or catch basin; in this way the need for adjustment risers of different thicknesses to accommodate manholes or catch basins having different gap dimensions between the lower support structure and the frame assembly is avoided.

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