| 摘要 |
<p>PURPOSE:To obtain the steel plate which saves labor on the machining process or the plate joining process of steel plate for bridge by having the thickness distribution of plate in proportion to the stress load and making the one side to the flat surface. CONSTITUTION:The rolling is executed by controlling the opening degree of work roll 55 so that the thickness distribution of plate is formed in proportion to the stress load at a hot reversible rolling mill by using the hot reversible rolling mill 50 and a bending mechanism. The rolled stock is treated with bending at the bending mechanism that top rolls are arranged against a pair of bottom rolls and the seamless steel plate is obtained. The steel plate can be formed to the flange member or the longitudinal member by suitably dividing, and the box girder bridge member and the plate girder bridge member can be easily obtained in low price by combining the flange member, the longitudinal member and the web member.</p> |
