| 摘要 |
PURPOSE: To prevent the warpage, bending and torsion of an eaves gutter by bilaterally installing metallic core material-containing projections formed to the internal surface of the semicircular eaves gutter along the longitudinal direction in length at the specified times of perimeter among the projections and reinforcing edges. CONSTITUTION: Projections 3, 3, which are formed to the internal surface of a semicircular eaves gutter 1 along the longitudinal direction and into which metallic core materials 4 are entered, are formed bilaterally at places of one quarter of perimeter from reinforcing edges 2. That is, a=2×b holds. Accordingly, the semicircular eaves gutter is thermally expanded and contracted left and right in a well-balanced manner, and warpage, bending and torsion can be prevented while workability, transportability and handing properties can be improved.
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