Shield tunneling system capable of electromagnetically detecting and displaying conditions of ground therearound

Claim 1

A shield tunneling system capable of electromagnetically detecting and displaying conditions of ground therearound comprising: a shield tunneling machine provided with a rotary cutter head disposed at a front end thereof and rotating about an axis directed in a forwarding direction of said shield tunneling machine for excavating the ground therebefore to construct a tunnel, and a skin plate connected to said rotary cutter head for covering a space formed between said cutter head and a front end of shield segments which are progressively constructed on an inner surface of the tunnel excavated; an electromagnetic wave transmitter/receiver mounted on an outside portion of said shield tunnelling machine for radiating an electromagnetic impulse toward the ground near said cutter head and for receiving the electromagnetic impulse reflected from the ground; a position sensor mounted on said shield tunneling machine for detecting a distance by which said electromagnetic transitter/receiver moves from a reference point in a predetermined reference direction in said tunnel and outputting a sampling pulse signal representing a sampling time at which the electromagnetic impulse reflected from the ground is to be sampled; a signal pre-processor located inside of said shield tunneling machine and connected with said electromagnetic wave transmitter/receiver and said position sensor for sampling the electromagnetic impulse reflected from the ground in response to said sampling pulse signal outputted from said position sensor and performing a pre-processing including noise reduction and smoothing of the reflected impulse to output a signal representing the condition of the ground from which the electromagnetic impulse is reflected at said sampling time; and a data processor located inside or outside of the tunnel and operably connected to said signal pre-processor by a communication cable, for processing the pre-processed signal from said signal pre-processor, and displaying continuously and in real time a two-dimensional graph representing a vertical cross-sectional view of the ground near the cutter head.