为提高大断面软弱围岩隧道微台阶、全断面法开挖初期支护拱架施工机械化水平,引进三臂拱架安装台车进行拱架安装。通过对三臂拱架安装台车参数和性能、施工工艺、与传统台车对比应用效果等多方面进行分析，主要结论如下： 1）三臂拱架安装台车抓举和连接拱架可在有效保证施工人员安全的前提下，缩短拱架安装时间； 2）钢拱架安装工艺流程更规范，有效提高拱架安装精度和质量； 3）三臂拱架安装台车和传统台架、改装机械设备应用效果相比，更适应大断面软弱围岩隧道微台阶、全断面法开挖初期支护拱架施工； 4）三臂拱架安装台车除可完成拱架安装施工外，还可辅助进行部分隧道高空作业施工。

In order to improve the mechanization level of arch frame construction of primary support in the early stage of fullface and microbench excavation of large crosssection weak surrounding rock tunnel, the threeboom arch mounting trolley is introduced. The parameters, properties and construction technology of the theeboom arch mounting trolley are analyzed, and comparison of applicable effect between the trolley and the traditional one is made. Some conclusions are drawn as follows: (1) The grapping and connecting arches of the trolley can effectively shorten the arch mounting time without hurting operates. (2) The steel arch installation process is more standardized, which can effectively improve the installation accuracy and quality of the arch. (3) Comparing to the traditional arch mounting equipments, the threeboom arch mounting trolley is more suitable for the arch frame construction of primary support of large crosssection soft surrounding rock tunnel by microbench and fullface excavation methods. (4) The trolley can also assist in the construction of some tunnels at high altitude.