Arch rib horizontal splicing jig frame

The utility model provides an arch rib horizontal splicing jig frame which is used for supporting arch ribs of a large-span steel pipe arch of a bridge and comprises a jig frame body and two pairs of positioning blocks, and a pair of sliding grooves are formed in the upper portion of the jig frame body side by side. Each pair of positioning blocks is assembled in the corresponding sliding groove in a sliding mode, each positioning block is provided with an arc-shaped supporting edge, and the radian of each arc-shaped supporting edge corresponds to that of the surface of an arch rib of the bridge steel pipe arch. 本实用新型提出一种拱肋卧拼胎架，用于支撑桥梁大跨度钢管拱的拱肋，包括：胎架主体和两对定位块，所述胎架主体的上部并列设置有一对滑槽；每对所述定位块分别滑动装配在一个所述滑槽内，每个所述定位块上别设置有弧形支撑边，所述弧形支撑边的弧度与桥梁钢管拱的拱肋的表面弧度相对应。