On January 20, China’s largest diameter slurry shield machine "Canal" cutter head independently developed and manufactured by CCCCTH went down to the well for assembly, marking the staged victory of the shield machine assembly work. It laid the foundation for the upcoming equipment commissioning work. The "Canal" shield machine has a diameter of 16.07 meters, breaking the record for the largest excavation diameter of the domestic shield machine and becoming the domestic largest diameter shield machine. It is composed of cutter head, shield body and 6 trolleys, with a total length of about 145 meters and a total weight of 4,500 tons. Luoyang Bearing Research Institute Co., Ltd. developed a slewing bearing for Extra Large Segment Assembling Machine for the project, with an outer diameter of 7.1 meters. The slewing bearing adopts a four-point contact ball structure, which not only has a high load carrying capacity, but also ensures the accuracy and efficiency of automatic tube assembly through the integrated design of the bearing and high-precision gears, and improves the overall performance of the equipment. "Canal" is expected to complete the commissioning of the whole machine and meet the conditions for launch by the end of March 2021.