Importance

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Abstract

A trench liner system used for lining a single containment trench and for forming a dual containment trench from a single containment trench comprising a primary liner means within the trench supported by a separating means between the primary liner and the trench walls and bottom, and a means for holding the primary liner means and the separating means to the trench walls. The separating means comprises a plurality of pairs of elongated members disposed along the trench such that the rear surface of each elongated member is in contact with one wall of the trench and the underside surface of each member is in contact with the bottom of the trench. The elongated members are in opposed relationship to each other. The length of the lower portion of each elongated member is less than one-half the width of the bottom of the trench so that a gap is formed between the distal edges of the lower portions to position therein a means for detecting a leak in the primary liner. The separating means also includes a perforated bridge in contacting relationship with the distal edges of the opposed elongated members. The separating means comprises a plurality of ribs spaced along each elongated member, so that the primary liner means is supported by the ribs and a cavity is formed between the primary liner means and the separating means between the ribs.

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First Claim