1. Welders, scaffolders and other special types of work must hold relevant certificates;
2. Equipped with fire safety equipment;
3. When chiseling out the unstable sprayed concrete block at the mouth of the cave, pay attention to whether there is any big slip. If there are signs of large slip, notify the technical personnel on duty in time to analyze the potential safety hazards on site;
4. Observe the inspection hole for 24 hours. If there is sediment or water gushing, block the inspection hole with cotton yarn and wooden wedge prepared in advance;
5. Operators should wear safety helmet, safety belt, work clothes, insulating shoes, protective cover, etc.
6. If the shield machine cannot be started in time after David's excavation, assign special personnel to observe David's soil deformation and monitor the ground settlement at the same time. If the ground subsidence exceeds the allowable value, start emergency measures.
7. Preparation of emergency materials for shield tunneling.
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