Mechanized Construction Of Fabricated Arches For Large-Diameter Tunnels

There are many challenges in the construction of large-diameter tunnels, such as low efficiency of manual construction and poor safety. To solve the problems, a multi-functional arch installation machine, an auxiliary arch installation machine and matching devices of fabricated arches are developed. A new mechanized construction technology of fabricated arches is put forward. The numerical calculation and laboratory experiment are carried out on the mechanics mechanism of the I-steel arch in the mechanized construction process. The results show that the maximum stress value appears at the arch skewback and vault. In order to reduce the deformation of the key parts in the process of the arch installation, the skewback is reinforced to increase the local strength. In addition, the method of the manipulator with splint to lift the arch is proposed to reduce the stress concentration of the arch vault. Based on the above research, the application for mechanized construction of the fabricated arch is carried out on site, and both of the construction efficiency and the safety are significantly improved.