Device for back soil disturbance in shield tunnel

An apparatus for disturbing soil encircling a shield tunnel, the apparatus comprising a fitting I and a fitting II connected by means of three bolts wherein each two of the three bolts form an angle of 120° there-between;

• the fitting I is a first circular pipe;
• an end surface of a fitting end of the fitting I is provided with a water passage;
• a pipe wall of the pipe is provided with 2-8 water spouts;
• and an angle of 60° is formed between each of the water spouts and a radial direction;
• the fitting II is a second circular pipe whose inner and outer diameters are same as those of the fitting I respectively;
• a fitting end of the fitting II is provided with two O-shaped water stop rings;
• a pipe wall of the fitting II is provided with three water inlets in communication with the water passage of the fitting I wherein each two of the three water inlets form an angle of 120° there-between;
• an outer wall of a middle part of the fitting II is provided with a leather bag;
• the leather bag is in communication with a water stop leather bag pressurization hole by using a radial water stop leather bag pressurization passage;
• the water stop leather bag pressurization hole and communication ports of the water inlets open to an end other than the fitting end of the fitting II;
• and
• centers of the fitting I and the fitting II are provided with through soil and water excavating and dumping holes extending parallel to the axis of the fitting I and the axis of the fitting II respectively, and diameters of the two soil and water excavating and dumping holes provided on the two fittings are the same.