| 摘要 |
PROBLEM TO BE SOLVED: To avoid an ill effect caused by elongation due to thermal expansion and hygroscopic swelling by connecting a plurality of rail members in the facing state of orthogonal end planes by a connecting member inserted in the rail members, to form a rail part, and providing an expansion allowance in the longitudinal direction of the rail part. SOLUTION: A rail part 3 is formed by connecting a plurality of rail members 3A formed of cylindrical pipes. The rail members 3A have end planes 3B in the orthogonal direction to the longitudinal direction, and the end planes 3B, 3B are placed face to face with each other at the joint parts and thread- connected without a clearance by a sizing bolt 4 inserted inside each cylinder with an internal thread formed at the end. The rail part 3 is clamped by rail receivers 2, 2 formed of short-sized angle steel fixed to a fitting face by anchor bolts 5, and abuts on a fixed member 6 formed of angle steel, at the tip in the proceeding direction (the direction of an arrow mark X) of flight. A fixed member 8 formed of angle steel is provided on the rear end side on the opposite side to the proceeding direction of flight, leaving an expansion allowance 7.
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