Research on the Cutterhead Layout Scheme of Rectangular Shield Tunneling Machines in Sandy Strata
The cutting section shape of a rectangular shield tunneling machine is not center rotation symmetry.How to choose a suitable cutterhead layout scheme based on different geological conditions is a difficult point in the development of a rectangular shield tunneling machine.Based on the Four Seasons Green Station project of Hangzhou Rail Transit,comparing the construction parameters of rectangular shield tunneling machines under two construction conditions of clay and sandy strata,it was found that the shield tunneling machines were subjected to significant thrust and torque in sandy strata,and there were significant impacts.The structural form of the original eccentric multi axis drive profiling cutter head cannot meet the construction conditions in sandy formations.Targeted research and design of a cutterhead layout scheme,using a combination cutting form of 2 X-shaped large cutterheads and 2 retractable circular auxiliary cutterheads,and adding key functions such as auxiliary cutterhead drive with retractable function,shell structure at cutting blind spots,and soil improvement.The research and practice of this cutterhead arrangement scheme is of great significance for improving the geological adaptability of rectangular shield tunneling machines.
quasi rectangular shield machinecutterheadlayout plancutter head drive with telescopic functionsandy formation
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