Method of lining passageways by applying a pre-liner sleeve and hardenable composition
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United States of America Patent
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Aug 12, 1997
Grant Date -
N/A
app pub date -
Oct 17, 1994
filing date -
Dec 20, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of lining passageways, or pipelines, employs a pre-liner sleeve formed of a thin plastic material, which is applied to the inside surface of the passageway to be lined. During application of the pre-liner sleeve, it is held in a concertina-like folded condition in a magazine which is moved along the passageway by operation of air pressure which is applied from within the pre-liner sleeve, and which simultaneously inflates the pre-liner sleeve so that it communicates with the inside surface of the passageway. A spray head follows the magazine from within the inflated pre-liner sleeve and applies a hardenable composition, such as mortar, to the inside of the inflated pre-liner sleeve. The spray head is followed, in some embodiments, by a tube which is everted to communicate with the applied hardenable composition under air pressure. The tube holds the applied layer in position while it cures.
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