Slurry shield tail brush replacement liquid nitrogen freezing safety protection device and method under high water pressure condition
A technology of safety protection device and shield tail brush, which is applied in the field of shield machines, can solve the problems of affecting the sealing effect, rubber tube aging, water seepage, etc., and achieve the effect of ensuring the safety of personnel and equipment, easy operation, and rapid freezing
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[0034] Example 2
[0035] A safety protection method for replacing liquid nitrogen freezing with muddy water shield shield tail brush under conditions of high water pressure includes the following steps:
[0036] 1) Stop the shield machine, stop working and check the leakage point of the shield tail;
[0037] 2) The stainless steel hoses of the liquid inlet and outlet pipes are connected to the liquid nitrogen system, and the liquid nitrogen is introduced. The pressure of the liquid nitrogen is 0.1MPa, and the temperature is measured;
[0038] 3) Continuously introduce liquid nitrogen at a pressure of 0.1 MPa to freeze and perform temperature monitoring to detect leakage at the leakage point, the final temperature is -18°C;
[0039] 4) After the leakage is eliminated, continue to inject liquid nitrogen at a pressure of 0.08 MPa to maintain freezing;
[0040] 5) Implement the plan of removing and replacing the shield tail brush at the leaking part;
[0041] 6) After the replacement is comp...
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