Importance

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Abstract

In a method of manufacturing consecutive pre-tensioned concrete elements, e.g. concrete sleepers, in a long mould bed, reinforcement ropes are tensioned and closure members are placed between different elements. Prior to casting closure members which are so formed that two or more cast elements are joined together via bridges or shoulders projecting outwardly fron the elements and surrounding the reinforcement ropes are placed in the mould bed at predetermined intervals. The string of cast elements is advanced to an element-separating station at one end of the bed where the elements are successively cut by means of a diamond saw or the like. The bridges between the elements are formed in a manner such that the reinforcement ropes are protected and a small, preferably the smallest possible section of concrete between the elements is severed when the elements are separated from the string of elements. The cast elements may be removed from the mould bed by lowering said moulds and carrying the string of elements on movable conveying means. Alternatively the moulds may be turned after the casting operation. The string of elements is then removed from the mould bed by pressing the string of elements down therefrom or by lifting the moulds. The invention also concerns a mould bed for casting a string of consecutive elements of the abovementioned kind, said mould bed comprising conveying means for advancing the string of elements to a severing station at one end of the bed.

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First Claim