Pipe-jacking shield dual-mode structure

The invention discloses a pipe-jacking shield dual-mode structure, relates to the technical field of shield tunneling machines, and solves the problems that a cutter head, a front shield and a rear shield of the shield tunneling machine are connected with one another and move synchronously, so that the shield tunneling machine can lay tunnel segments only after the cutter head conducts tunneling and drives the front shield and the rear shield to move, and the laying efficiency of the tunnel segments is affected. A pipe jacking shield double-mode structure comprises a shield tunneling machine front shield, and a shield tunneling machine cutter head is arranged at the front end of the shield tunneling machine front shield. The front shield and the rear end are connected in a non-fixed mode, the thrust oil cylinders with the pushing function are arranged among the cutterhead, the front end and the rear shield, and under the condition of soil layers with different hardness, the soil layers can be crushed in the m