A re-useable void former for forming voids in concrete structures adapted to be positioned in wet concrete being of a flexible and elastic material to allow the void former to pucker inwardly when unsupported; a retainer adapted to support and maintain the outer shape as the concrete sets; a remover adapted to engage the void former on withdrawing the retainer wherein the unsupported void former is able to pucker and be pulled from the void thus formed for reuse. A method of use of the invention.
A reusable inwardly collapsible void former
2015-04-16
Patent
Elektronische Ressource
Englisch
IPC: | E04G SCAFFOLDING , Baugerüste / B28B Formgeben von Ton oder anderen keramischen Stoffzusammensetzungen, Schlacke oder von Mischungen, die zementartiges Material enthalten, z.B. Putzmörtel , SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last |
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