Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

CLASS D BEDDINGUsed only with circular pipe, little or no care isexercised either to shape the foundation surface tofit the lower part of the pipe exterior, or to fill allspaces under and around the pipe with granularmaterials. However, the gradient of the bed shouldbe smooth and true to established grade. Thisclass of bedding also includes the case of pipe onrock foundations in which an earth cushion is providedunder the pipe but is so shallow that the pipe,as it settles under the influence of vertical load, approachescontact with the rock.American Concrete Pipe Association • www.concrete-pipe.org 29