Method and device for trenchless reinforcement of existing railway roadbed

The invention discloses a method and a device for trenchless reinforcement of an existing railway roadbed. The method and the device for selective reinforcement in a roadbed without influence on driving are designed by combination of a trenchless technology and a high-pressure jet grouting method. Through the trenchless drilling technology, holes are drilled in the existing railway roadbed, and along drilling tracks, high-pressure jet grouting reinforcement on the roadbed is carried out. Through creative development of a drilling track automatic-control system, a clear and convenient man-machine conversation operating platform is realized and is used for real-time monitoring and correction of the drilling tracks. Through reconstruction of the existing high pressure rotary jet grouting device, a bending rotary jet grouting drill pipe technology is realized. Through combination of a trenchless hole-forming mode and a device structure, cooperation of a hole-forming device and the rotary jet grouting device is realized. The method and the device realize timely and accurate reinforcement for improving defects in the roadbed, guarantee traffic safety and have an important technological value and a practical meaning for railway reinforcement.