Winterton Leachate Treatment Plant
Post-tensioned precast tanks have been a commercially viable alternative to in-situ concrete structures for over 30 years. During this time A-Consult have been at the forefront of product development, being amongst the first to locate the post tensioning tendons within the precast panel and responsible for developing the no maintenance EPDM rubber jointing gasket. The latest development offered by A-Consult is the Extracted Anchor Arrangement. The benefits of incorporating the extracted anchor arrangement in our structures result in PE-sheeting protected tendon fully encapsulated within the ducting system; maximum possible protection to the post tensioning tendons; easy access for inspection.
The Aqua-Tank is constructed using high specification concrete panels held together by a series of circumferential 7 wire PE-sheeted grease impregnated tendons. The tendon is coated in a highly corrosion-resistant grease conforming to the recommendations of both the American Post Tensioning Institute and the FIB. The PE-sheeting is formed by the continuous hot extrusion of high density polyethylene or polypropylene to a minimum redial thickness of between 1.00mm and 2.00mm, again conforming to recommendations of both the American Post Tensioning Institute and the FIB.
The Aqua-Tank panel seal is unique due to the use of a patented, WRAS approved, substantial EPDM Rubber strip, which absorbs the movement to which every tank is subjected; e.g. seasonal weather changes, variation in liquid level and external pressure from back-fill. Its elasticity is resistant to ammonia and ultra violet light, and with a life expectancy in excess of the concrete panels themselves results in no maintenance on this area for the structures total design life.
The panel to base seal is typically performed by applying a rebate solution to the base slab. The A-Consult panels can be provided with dowel bars if required. Below shows a typical ring beam section showing how an effective seal is achieved by utilising the step in the base slab along with the correct placement of three strips of hydrotite. Additional security can be achieved during the construction of the in-situ ring beam by forming a small rebate to the inside face and then by filling this rebate with an elastic polyurethane sealant after the ring beam has cured.
With a 50 year design life the A-Consult precast concrete tank system offers a cost effective and robust solution to many process and storage applications.
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