| 摘要 |
<p>PROBLEM TO BE SOLVED: To avoid inconvenience caused by deflection of a lower chord member, and to reduce labor in installing work by respectively fixing level raising members to hold the lower chord member in a position higher than the upper surfaces of girder beams to both end part under surfaces of the chord member of a roof truss extended between a pair of girder beams arranged in parallel to each other. SOLUTION: Level raising members 5 and 5 to hold a lower chord member 3 in a position higher than the upper surfaces 2a and 2a of girder beams 2 and 2 are respectively fixed along the lower chord member 3 to both end part under surfaces 3b and 3b of the lower chord member 3 of a roof truss 1 extended between a pair of girder beams 2 and 2 arranged in parallel to each other. The level raising members 5 are formed by cutting a long size ligneous material having the same width as the lower chord member 3 and thicker than the the lower chord member 3 at the same angle as an inclination of an upper chord member 4 in a prescribed position. Therefore, since there is no need to previously fix the other support member on a pair of respective girder beams 2 and 2 in installing the roof truss 1, an installing work at a job site can be completed only by respectively placing/fixing the level raising members 5 on the girder beams 2.</p> |
