RISK ANALYSIS AND AVOIDANCE RESEARCH ON LONG-TERM SHUTDOWN OF SHIELD TUNNELING MACHINES
In the process of shield tunnel construction,due to various reasons,the shield machine may be shut down for a long time,and the long-term shutdown is easy to cause problems such as the subsidence of the shield machine,the difficulty of retracting the hinged cylinder,and the difficulty of repushing.In order to avoid these risks,taking a project as an example,by analyzing the shutdown risk,the risk avoidance measures in the normal tunneling shutdown process are summarized from the aspects of shutdown preparation,shutdown process,and work during shutdown,and the risk avoidance measures in the process of secondary assembly shutdown are introduced from the aspects of in-machine measures,monitoring and measurement measures,etc.Practice shows that various measures in the construction are effective to ensure the smooth construction of the project.
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