Cast concrete element for underground tubular structure

Details Cast concrete element for underground tubular structure Cast concrete element for underground tubular structure

E - Fixed Constructions

21

D

61/64

E21D 11/08 (2006.01)

Patent

CA 1217645

ABSTRACT: "CAST CONCRETE ELEMENT FOR UNDERGROUND TUBULAR STRUCTURE" A modular cast concrete element capable of being assembled with other, similar elements into a tubular underground installation (e.g. sewer duct, tunnel liner) has a well opening to each of its axially-facing end surfaces wherein a rod is received that is insertable in a like well in an axially adjacent element to guide one of the elements to a predetermined position relative to the other and lock it in that position. In each well is a tubular retainer containing a securement member having an annular radially outer marginal portion confined in a circumferential radially inwardly opening groove in the retainer and having resilient radially inwardly projecting teeth. The teeth have radially inner edges on a circle of smaller diameter than the rod and are flexible axially to enable the rod to be easily inserted into the securement member but to engage it under convergent bias for holding it against withdrawal from the well. Each retainer can be assembled from commercial plastic pipe fittings or may be formed from injection mouldings.

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