| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel-made trough floor structure having the countermeasures to a heat-deterioration and to a heat-expansion, and at lower cost and for a shorter term of the work in comparison with the steel-made trough flowing structure according to the conventional technique. SOLUTION: In the trough, for which a high temperature flowing material, such as molten iron and molten slag, flows, set on a casting floor for blast furnace, a trough floor unit 21a is constituted by setting a plurality of square type steel tubes 21 for trough floor extended in the rectangular direction to the molten metal flowing direction in the trough. On the bottom surface at the side for receiving the heat from the high temperature flowing material flowing in the trough groove 22 in the square type steel tube 21 for trough floor, a slit 25 for absorbing the heat expansion of the square type steel tube extended in the longitudinal direction of the square type steel tube is opened and this slit is closed with a tape 34. COPYRIGHT: (C)2004,JPO
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