Abstract: In order to solve the technical problems existing during assembly of the traditional arc parts (boxshaped piece) for shield tunnels, such as unadvanced assembly technology, poor assembly accuracy, low degree of equipment intelligentization, slow construction progress, etc., an intelligent walkthrough assembling machine for arc parts is developed, by introducing the concept of equipment design and intelligent control, adopting the design idea of walkthrough arcshaped components, and combining the millimeterlevel loadsensitive hydraulic system and submillimeter level attitude monitoring system. It can realize intelligent assembly of arc parts with onebutton operation. The assembling machine is equipped with intelligent control technology such as fineadjustment measurement system, automatic detection and perception, automatic calculation and analytical processing, automatic decision making and action execution, humancomputer interaction and information storage, etc. It has been applied for the first time in Contract JCXSG11 of Shanghai rail transit airport link line, and has achieved good performance in assembly. The results show that: (1) The control accuracy of the hydraulic system of assembling machine is up to 0.5 mm, and the assembly accuracy of arc parts is up to ±5mm, and thus highprecision assembly is achieved. (2) Through the intelligent control technology, onebutton operation is realized for the assembling machine. It takes 32 min for each cycle, improving the construction efficiency by more than 30%, and saving labor by more than 50%. (3) The intelligent walkthrough assembling machine for arc parts has stable and reliable performance, which can record and store the parameters such as operation state, control mode, sensor data, hydraulic cylinder stroke data and communication state, and realize humancomputer interaction.

Key words: large-diameter shield tunnel, tunnel arc parts, prefabrication and assembly, high precision, intelligentization; synchronous construction, walk-through assembling machine