This creation tunnel type simple frame pipe fitting system what plural number arcuation pipe and longitudinal pipe and pipe fitting composition, every two arcuations pipe what top is with respect to the lateral arch support of formation in intercalation what pipe fitting, and longitudinal pipe then runs through plural pipe fitting and constitutes the simple frame of tunnel type. Pipe fitting is made of longitudinal pipe sleeve and lateral pipe sleeve, the two is in interlude joint forming, its characteristic is in what: the transverse direction pipe sleeve is bent into arc diameter shape from middle down to both ends respectively, and pipe flange is connect with pipe flange formation same plane outside lateral pipe sleeve top outside longitudinal pipe sleeve system's what top, and pipe flange outside pipe fitting top is made to form same arc diameter plane person.本創作隧道式簡易棚架管接頭係於複數弧狀管及縱向管及管接頭組成，每兩弧狀管於頂端相對嵌插於管接頭內形成橫向拱形支架，而縱向管則貫穿複數管接頭構成隧道式簡易棚架。管接頭係由縱向管套及橫向管套所組成，兩者在中間段連接成形，其特徵在於：該橫向管套係由中間處分別向兩端往下彎折成弧徑形狀，而縱向管套係於頂端外管緣與橫向管套頂端外管緣形成同一平面連接，使管接頭頂端外管緣形成同一弧徑平面者。
