31.7米预应力钢筋混凝土梁已在铁路桥中普遍采用。该梁每片重达110余吨,连同架梁时的附属设备(铁扁担等)重达约130吨。以前用仿苏型130吨架桥机架设。这种架桥机不仅不能在隧道口架设31.7米的预应力钢筋混凝土梁,而且还要在桥头铺设岔线,桥头处需垫厚约50厘米的石碴,密铺枕木,有时还需扣轨。即使采取了这些加固措施,还曾发生过一些事故。这些缺陷就原来的架桥机小修小改,是无 31.7 meters prestressed concrete beams have been widely used in railway bridges. The beam weighs more than 110 tons per piece, together with the ancillary equipment (iron pole, etc.) when weighing about 130 tons. Imitation Su-type 130 tons before the bridge rack set up. This bridge machine can not be set up in the tunnel mouth 31.7 meters of prestressed concrete beams, but also in the bridge laying fork line, the bridge at the need to pad thickness of 50 cm of ballast, confined sleepers, and sometimes need to buckle . Even with these reinforcement measures, there have been some accidents. These defects on the original bridging machine small repair small change, yes no