Shield machine compression welding technology to fill domestic maintenance technology blank

The underground diameter line of the Beijing Railway undertaken by the China Railway Tunnel Group, in the third transformation of the shield cutterhead, was carried out for 1.5 days, 2.2bars, and 3bars in the shield cutter deck of the shield cutter for two days. Under the conditions of 15 meters, 22 meters, and 30 meters under the compressed air, the cutting and welding technology was successfully tested. The end of the Chinese shield machine's cutter plate repair with pressure fire welding and welding repair can only rely on the history of German technology, and filled the domestic shield repair. Blanking with pressure fire repair technology.

According to reports, during the completion of the 3806m shield tunneling, China Railway Tunnel Group has performed several tool replacements and secondary cutterhead repairs based on the wear of cutters and cutterheads. In the cutterhead maintenance, due to the control of land subsidence, the cutter-cylinder compartment must be maintained under pressure, and the cutter-disk maintenance must be carried out under the conditions of compressed air in the cabin. This has a high risk and is currently a domestic fire with pressure. The cutting and welding technology is still blank. The German construction technicians are responsible for pressure welding and welding. In order to overcome this technical difficulty, the China Railway Tunnel Group organizes technical personnel to carry out many technical researches and formulates systems, science, and security in conjunction with reality. The Shield was equipped with a pressure fire welding and welding technology experimental program, and invited professors and experts from Naval University of Engineering, Beijing University of Technology and Beijing University of Petroleum to demonstrate the technical solutions. The success of this experiment provided China's shield machine with valuable experience in repairing the cutterhead under the condition of compressed air, which provided a reliable guarantee for the large-scale development of underground space using shield construction.