基桥桥址处两岸为岩质陡壁,洪水时水深流急,且河槽范围内有断层通过,主跨采用予应力混凝土斜腿刚构。斜腿刚构的斜腿和中跨梁身构成一吻合性较差的拱桥,承受着相当大的轴向压力,有利于采用予应力混凝土,并较大程度地减少了需要供给的予加力。因受桥址岩质岸坡地形控制,斜腿较长。斜腿刚度较梁身刚度为 Both sides of the foundation bridge site are rocky steep walls, where the water depth and current flow in the flood are in urgent need. There are faults in the river channel area, and the main span adopts rigid concrete slanting legs. Slant legs of the diagonal leg rigid frame and the middle span girder constitute an arch bridge which is less consistent, bear a considerable axial pressure, facilitate the use of prestressed concrete and greatly reduce the force required to be supplied . Due to the topography of the rocky slope of the bridge site, the inclined leg is longer. Slant leg stiffness than the beam stiffness