The main bridge type crane, the erection and assembly has strict technical requirements, and a set of measurement methods to measure the installation result strictly.
桥架式桥式起重机的主体，其架设和组装都有严格的技术要求，并有一套严格的测量方法来测量安装结果。
2
The text detailedly introduced crown block, running system, availability work period of bridge girder erection equipment and improve case for precast beams install.
详细介绍了对双导梁式架桥机天车、行走系统、有效工作长度及预制梁安装就位的改进情况。
3
Used as the auxiliary supporting system for erection of the spans, the pier-side brackets to be arranged at the main piers of the bridge were indispensible.