Seals for tunnelling shields

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring

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E01G 516

Patent

active

041399897

ABSTRACT:
A tail seal for a tunnelling shield, particularly for use in the bentonite process, in which a seal is formed of short brush-like material mounted on a flexible support and resiliently urged by a body of closed cell expanded material, such as neoprene. In a preferred form the flexible support is secured both fore and aft and the closed cell expanded material has an inflatable member embedded therein.

REFERENCES:
patent: 3410098 (1968-11-01), Winberg
patent: 3494136 (1970-02-01), Wilms
patent: 3788087 (1974-01-01), Patin
patent: 3827244 (1974-08-01), Walbrohl
patent: 3979920 (1976-09-01), Burgess et al.

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