| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce cost and improve workability by arranging a plurality of main trusses supporting a roof with the upper chord materials in parallel with each other, and respectively joining both end parts of the lower chord materials of nearly isosceles triangular sub-trusses supporting the roof with the top points with the intermediate parts of the lower chord materials of the opposed main trusses. SOLUTION: A plurality of main trusses 1 are constructed in parallel between both side parts of a ridge truss 5 and girder beams 6 opposite to this. Isosceles triangular sub-trusses 3 are built between the intermediate parts of the lower chord materials of the main trusses 1, 1 opposite to each other. In this case, a connecting metal fitting is provided on the intermediate part of the lower chord material of the main truss 1, and the end part of the lower chord material of the sub-truss 3 is placed on the connecting metal fitting so as to join them together by bolts. A roof panel constituting a roof is supported with the top parts of the sub-trusses 3. Hereby, the number of used main trusses of long length can be reduced so as to curtail the cost, and the number of worked main trusses of long length and heavy weight is reduced so as to improve workability.</p> |
