Lining of passageways
AssigneeTrio Engineering Ltd.
InventorBernard Barber
Life of this patent
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Abstract
The invention permits the lining of a passageway or pipeline with a resilient but robust, semi-rigid plastics pipe. The invention enables the lining of pipelines and passageways of long length by extruding the lining tube on site, deflecting the tube so that it is deflected into smaller diametral size, holding the tube in the deflected condition, feeding the deflected and held tube into the passageway to be lined, and releasing the hold on the tube so that it deflects or is deflected back to its original form and lines the pipeline or passageway.
Claims16
A method of lining a passageway comprising extruding a tubular liner of plastics at the site of the passageway to be lined, such liner being of such a resiliency that it can be flexed but will return or tend to return to the unflexed condition when released, deflecting the tubular extrudate while the extrusion continues to a condition in which the largest diameteral dimension of the deflected tube is less than the outer diameter of the undeflected tube, releasably holding the tube whilst in deflected condition, inserting the held, deflected tube into the passageway to be lined, while the extrusion continues, and releasing the hold on the tube when the tube is in the passageway and either allowing or causing the tube to return to its initial undeflected condition.
A method of lining a passageway comprising inserting in the passageway a tubular liner of plastics of such resiliency that the tubular liner can be flexed but will return or tend to return to the unflexed condition when released, deflecting the tubular liner to a condition in which the largest diametral dimension of the deflected tube is less than the outer diameter of the undeflected tube, releasably holding the tube while in deflected condition, inserting the held, deflected tube into the passageway to be lined, buoyantly supporting the deflected and held tube as it is fed into the passageway using liquid in the passageway, and releasing the hold on the tubular liner when the tubular liner is in the passageway and either causing or allowing the tubular liner to return to its initial undeflected condition.
A method of lining a passageway comprising inserting in the passageway a tubular liner of plastics material of such resiliency that the tubular liner can be flexed but will return or tend to return to the unflexed condition when released, deflecting the tubular liner to a condition in which the largest diametral dimension of the deflected tubular liner is less than the outer diameter of the undeflected tubular liner, releasably holding the tubular liner while in deflected condition by a means containing a fuse wire which extends longitudinally of the liner and the setting off of which effects release of said holding of the tubular liner, inserting the held, deflected tubular liner into the passageway to be lined, setting off the fuse wire to release the hold on the tubular liner and either causing or allowing the tubular liner to return to its initial undeflected condition.
Dependencies are inferred from the claim text.