Civil air defense projects are divided into eight grades according to the resistance grade. Which grade is the tallest, Grade One or Grade Six?

According to the resistance grade, the civil air defense project can be divided into nine grades, such as 1, zhi2, 2B, 3, 4, 4B, 5, 6 and 6B, which can be directly called a civil air defense project.

Underground venues for literary and artistic activities (including dance halls, cinemas, exhibition rooms, video halls, karaoke halls, shooting ranges, playgrounds, billiards rooms, swimming pools, etc.). ), underground classrooms, offices, auditoriums (conference rooms), laboratories, underground hospitals (operating rooms, first-aid stations, medical stations), underground production workshops, warehouses, power stations, reservoirs, etc.

Extended data:

According to the architectural form:

Civil air defense engineering can be divided into tunnel engineering, tunnel engineering, accumulation engineering and excavation engineering according to the construction form.

Tunnel engineering: Tunnel engineering is an underground excavation engineering with the main ground mostly below the lowest entrance and exit, which is mostly built on the flat ground.

Tunnel engineering: Tunnel engineering is an underground excavation engineering in which the main ground is mostly higher than the lowest entrance and exit, and it is mostly built in mountainous areas or hilly areas.

Stacking project: Stacking project refers to the project whose structure is higher than the original surface and covered by backfill.

Excavation project: Excavation project is a kind of project constructed by cut and cover, and most buildings are located below the original ground, including single projects and ancillary projects. Generally, there is no directly connected building on the upper part of a single building project; There is a solid building in the upper part of the accessory project, also known as the air defense basement.

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