YQC7000 center shaft Pre-tunnelling Machine is one of core equipments used in tunnel construction. It consists of cutter assembly, arch assembly, travel assembly, concrete injection assembly, back-up system, electric system and hydraulic system, together with pre-tunnelling, synchronous injection, self-travel, rotating, adjusting of cutting in angle & radius & depth and self-diagnoses. It operates in equipped with special cutter to shape a groove in certain thick and depth, meanwhile, by means of jet sprayer to form a concrete shell in supporting the tunnel face. And the construction of excavation work, muck transport, arch inverting, lining and waterproof can be safely executed under the intensified shell. The equipment is excellent of safety, anti-settlement, anti-vibration, productivity and lower cost.