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The open tbm is the most traditional among the hard rock tbms and is the fastest and most effective to bore tunnels in healthy hard rock formations.During the boring operation, the rear part of this tbm, called the gripper device, is firmly anchored to the tunnel walls by two large gripper pads while the front part of the tbm, containing the.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.