CONCRETE SLEEPER AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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Issued Date -
Jul 22, 2010
app pub date -
Jan 3, 2008
filing date -
Feb 20, 2007
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Abstract
Method of manufacturing a concrete sleeper, comprising the following steps: insertion of pre-stressing rods into a sleeper mould, simultaneous automated tensioning of the individual pre-stressing rods, filling of the sleeper mould with concrete, leaving of the concrete to harden, removal of the concrete sleeper from the mould, wherein for one concrete sleeper more than four, in particular five to eight, pre-stressing rods are used and the pre-stressing rods are tensioned individually yet simultaneously.
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