| 摘要 |
PURPOSE: A re-prestressing steel for bridge and a steel re-prestressing method using the same steel are provided to improve the durability by preventing corrosion by moisture of concrete or oxygen. CONSTITUTION: A re-prestressing steel for bridge comprises the bundled steels(10,20) that have one unit steel or more and the tubular sheaths(1) that enclose the bundled steels. A steel re-prestressing method using the re-prestressing steel for bridge comprises the steps of; prestressing the spiral steel of sheaths; grouting mortar or grease into the sheaths to prevent the corrosion; fixing spiral steel; re-prestressing the covered steel by stages.
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