| 摘要 |
PURPOSE: To give an optimum load supporting capacity to a long span truss by covering the truss comprising a reinforced upper chord member, a bottom chord member and a post with concrete and providing the bottom chord member or the like with a reinforcement copper wire. CONSTITUTION: A steel truss 10 comprising an upper chord member 12 and a bottom chord member 14 that are connected with each other at both ends 16 and provided with an inclined post 20 and a vertical post 18 between the two ends is constituted. A plurality of the trusses 10 are arranged parallelly at a specified interval and the upper chord member 12 and the bottom chord member 14 having scaffolding members secured on bottom sides are connected to the post 18, 20 or are supported by other post connected to the truss and then a form is assembled in a U-shape having an opening in a top face so as to encase the upper chord 12 and the bottom chord 14. After a reinforcement member and reinforcement copper wire to be post-tensioned are disposed in the form, concrete is cast to make a long span truss and strength and rigidity of the truss are enhanced. |
