| 摘要 |
PROBLEM TO BE SOLVED: To facilitate positioning when precut rafters are attached to a pole plate as the precut rafters are made equal in projected length, even if the pole plate is curved. SOLUTION: A core line 7 connecting plate cares 5 at both ends of a pole plate 1 is marked on the upper surface of the pole plate 1, and a reference line 13 which passes a point A spaced from the end 11 a of a rafter 11 by a distance L1 and which is tilted by a root pitch angleθto the end relative to a line perpendicular to the upper and lower surfaces 11b, 11c of the rafter 11 is marked on the side face of the rafter 11. At a construction site, the rafter 11 is fitted into rafter notches 3, 4 formed respectively in the pole plate 1 and a purlin 2, and the rafter 11 is moved for positioning so that the reference line 13 is located just above the core line 7. Since the reference line 13 is marked as it is tilted by the roof pitchθ, the reference line 13 extends in the vertical direction during installation. Therefore, the work of positioning the rafter 11 relative to the pole plate 1 can be achieved by aligning the extension of the reference line 13 with the core line 7 of the pole plate 1, and accurate positioning can be achieved easily.
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