Evaluation of the Resistance to Collapse of Thin Walled Liners
ISBN: 1 84057 154 3
In the design of thin walled liners, the resistance to external pressure resulting from internal vacuum or external water table must be considered. It is the primary design criterion for thin-wall cured-in-place sewer linings. Laboratory tests on four different types of pipe material have demonstrated that the collapse pressures for unrestrained pipe are accurately predicted by the standard analytical solution. There is considerable enhancement of the collapse pressure in liners constrained from deformation by a host pipe. The degree of enhancement is dependent on the SDR of the pipe and is markedly affected by the presence of small folds or annular gaps between liner and host pipe. Excellent agreement has been obtained between predictions of the effects of gaps on collapse using a computer model and tests on PVCu and PE liners inside steel pipe. Design tables for common in- service situations have been produced.
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