Heavy fog, heavy rain and strong wind stop running at multiple levels.

Legal analysis: demolition operation is prohibited when the wind force exceeds level 4. According to the introduction of the Municipal Bureau of Quality Supervision, the standard was drafted by the Municipal Commission of Housing and Urban-Rural Development and is applicable to units and individuals engaged in new construction, expansion, reconstruction and demolition of construction projects.

According to the standard, high-altitude operation should be stopped in windy weather above level 5, and reliable anti-skid and cold-proof measures should be taken in high-altitude operation in bad weather such as rain and snow. In case of strong wind above level 5 (inclusive), the hoisting operation of large formwork should be stopped; The hoisting operation of tower crane must be stopped in strong winds above level 6, and the demolition operation shall not be carried out in rain, snow, fog and wind above level 4.

It is forbidden to run in for more than 2 hours. According to the standard, before foundation construction, trench excavation and pit excavation, the construction unit shall provide detailed underground pipeline and underground engineering data to the construction enterprise in writing. In addition, toxic and harmful gases and oxygen should be detected before underground operation, and the continuous working time of personnel should not exceed 2 hours, and a special person should be appointed for supervision, and continuous ventilation must be forced. "This is also necessary to ensure the safety and health of operators."

In terms of fire protection, video surveillance systems should be installed at the excavation face, construction shaft, open-cut foundation pit and other parts that need to be monitored in the construction site of rail transit project, and at least 1 video surveillance cameras should be installed, and more than 4 video surveillance cameras should be installed when the main structure foundation pit is open-cut.

Legal basis: "Code of Practice for Electric Power Safety of China Southern Power Grid Co., Ltd." Strong winds above level 5 and severe weather such as rainstorm, lightning, hail, fog and sandstorm should be stopped. Under special circumstances, when it is really necessary to carry out emergency repair in bad weather, necessary safety measures should be formulated and approved by the unit before it can be carried out.