1, adequate ventilation measures should be taken before operation, and the toxic and harmful gases can only be tested and analyzed to be qualified before going into the well for operation. During operation, ventilation should be uninterrupted, and timely detection and analysis. 2, arrange well-trained, strong sense of responsibility, familiar with the situation on the well, closely monitor the working conditions in the CMC to prevent the harm of unexpected situations. Construction personnel should master the methods and abilities of emergency self-help and mutual rescue. 3, underground workers must be highly alert to the harm of toxic and harmful gases to the human body, and make personal protection. When working underground, we must strictly abide by the "Technical Specification for Safety of Telecommunication Line Operation of China Telecom Group", with one person working and one person monitoring. If any abnormal situation is found, effective measures should be taken in time. When rescue workers need to go down to the well, they must fasten the rope and use isolated respiratory protective equipment (filter masks are strictly prohibited) before going down to the well for rescue. 4. For places limited by working environment and difficult to achieve adequate ventilation, operators must be equipped with and use isolated respiratory protection devices such as air respirator or hose masks (filter masks are strictly prohibited). When the danger of toxic and harmful gases such as hydrogen sulfide is found, the operation must be stopped immediately and the relevant departments should be reported promptly. At the same time, urge the operators to leave the job site quickly, and make warning signs to prevent other operators from causing injuries by mistake. 5, in the event of poisoning, suffocation and other accidents, as soon as possible to send the injured to a hospital with hyperbaric oxygen chamber for rescue treatment. 6. Whether it is a fixed operation or a temporary operation, eye-catching safety fences and warning signs must be set around the inspection wells (the company will adopt uniform standards), and safety operation boards should be set at the operation site according to government requirements, and the name of the operation unit, the operation site, the filing and auditing department, the person in charge of the on-site operation, the on-site safety officer, the toxic and harmful detection situation, the contact telephone numbers of the inspectors and units, and the report telephone numbers should be announced. The contents of warning signs should be clear "Dangerous places! Without approval, irrelevant personnel are strictly prohibited from entering. "
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