ROOF FRAME STRUCTURE

To form a roof capable of covering over a field while suppressing lengths of main beams using a structure of spectator stands of a stadium.SOLUTION: A roof frame structure is constructed through processes of: separating a skeleton spectator stand structure 2 provided with spectator stands by enclosing a field from its surroundings at least into a one-directional structure 21 where the spectator stands are aligned in one direction of the field and an other-directional structure 22 where the spectator stands are aligned in the other direction of the field; supporting with both of side columns 31, 31 an oblique beam 41 installed between the side columns 31, 31 integrated on respective rear sides of the adjacent one-directional structure 21 and the other-directional structure 22; supporting with middle parts in an axial direction of both of the oblique beams 41, 41 roof support beams 5 installed between the middle parts in the axial direction of two oblique beams 41, 41 adjacent to one direction or the other direction of the field; and supporting with both of roof support beams 5, 5 a plurality of small beams 6 installed between the roof support beams 5, 5 opposite to each other.SELECTED DRAWING: Figure 1 【課題】競技場の観客席の構造体を活用し、主要な梁の成を抑制しながら、フィールドの上空を覆い得る屋根を形成する。【解決手段】フィールドを周囲から包囲し、観客席を備えた躯体の観客席構造体２を少なくとも観客席がフィールドの一方向に配列する一方向構造体２１と、他方向に配列する他方向構造体２２とに区分し、隣接する一方向構造体２１と他方向構造体２２の各後方側に一体化する側柱３１、３１間に斜め梁４１を架設して両側柱３１、３１に支持させ、フィールドの一方向、もしくは他方向に隣接する２本の斜め梁４１、４１の軸方向中間部間に屋根支持梁５を架設して両斜め梁４１、４１の軸方向中間部に支持させ、対向する屋根支持梁５、５間に複数本の小梁６を架設して両前記屋根支持梁５、５に支持させる。【選択図】図１