Abstract: To solve the problems encountered during the assembly of prefabricated secondary lining of mined metro tunnel in terms of limited space, inconvenient transportation, difficult positioning, tunnel structure, joint between precast and castinsitu structure, transportation in a shaft, and construction technology, two suits of equipment, a grippertype and a manipulatortype assembling machine and their technical demands, are investigated using numerical analysis and shieldengineering analogy method. The construction technology of the assembling machine and structural conditions for the prefabricated lining ring are presented. The mechanical assembly of the lining ring in a primary support inner contour is realized. The main conclusions are as follows: (1) The grippertype assembling machine can continuously keep the lining ring in a compaction state. The gripper should act on the primary support structure; thus, the bearing capacity of the primary support should not be less than 150 kPa. (2) The longitudinal compaction state of the lining ring can be achieved by the manipulatortype assembling machine with the help of lining ring bolts. The waterproof of 300mm thick lining rings can be realized when the axial force of bolt reaches 25 kN.  (3) The independent hoisting shaft for the assembling machine should be used, and the clearance size generally can be 4.6 m × 6.7 m. (4) For the nonstandard crosssection of the underground metro section, the castinsitu method should be employed first; then the assembled structure should be wellconnected to the castinsitu structure, thereby ensuring smooth passage of the assembling machine. (5) The accurate positioning of the assembled ring can be realized using a positioning guide in advance.

Key words: metro, mined tunnel, prefabricated type, secondary lining, precast technology, assemble mechanic method, assembly conditions