A bomb shelter is a cave used to defend against enemy air raids to minimize losses, and is usually used to store food and munitions. Storage rooms are mostly basements, which make it easy to hide. Classified according to the form of structure according to the form of structure, the air defense project can be divided into tunneling, trenching, stacking and dug-in projects. Tunnel project tunnel project is most of the ground body is lower than the lowest entrance and exit, mostly built in the flat ground of the concealed excavation project. Mine engineering pit project is most of the ground higher than the lowest entrance and exit of the concealed excavation works, mostly built in mountainous or hilly areas.
Architectural worksArchitectural works are works in which most of the buildings are located above the original ground surface and covered by backfill. Excavation works excavation works is the use of open excavation method of construction, and most of the buildings are located below the original ground surface of the project, including single-built and attached construction. The upper part of the single-built project generally does not have a directly connected building; the upper part of the attached project has a solid building, also known as an air defense basement. People's air defense projects were mainly tunnel projects in the early days. From the 1980s, the construction of people's air defense implemented a strategic shift in guiding ideology, emphasizing the integration of peace and war and serving economic construction and urban construction, and most of the new people's air defense projects are dug-out type with good location and high quality. At the same time, some of the human defense projects are generally higher grade of decoration than the ground building to attract people to the ground down to provide people with a relatively comfortable environment.
War time function classification according to the different wartime functions, the human defense communication engineering can be divided into command and communication engineering, medical rescue engineering, air defense professional team engineering, shelter engineering and other auxiliary engineering. Commander communication project communication command project refers to all levels of human defense command institutions and their communications, power, water and other ancillary projects collectively; medical rescue project medical team is to provide wartime medical team of underground central hospitals, underground emergency hospitals, medical rescue station collectively; air raid special human defense professional team refers to all levels of human defense rescue, firefighting, chemical defense, communications, transportation, public security and other professional teams and their corresponding Auxiliary supporting works;
Personnel sheltering works, personnel sheltering works refers to all levels of party, government and military organs, organizations, enterprises and institutions, residential sheltering works and their ancillary auxiliary works, refers to underground hospitals, various warehouses, production sites, evacuation of motorized arteries, connecting corridors, regional, supply, and nuclear surveillance stations. According to the usual use of the situation, air-raid shelter human defense works are divided into underground hotels (guest houses), underground shopping malls (stores), underground restaurants (restaurants, food stores, bars, cafes), underground cultural and artistic activities (including dance halls, movie theaters, exhibition halls, video halls, karaoke halls, shooting ranges, amusement parks, billiard rooms, swimming pools and so on), underground classrooms, offices, auditoriums (meeting rooms), test rooms, Underground hospitals (operating rooms, first aid stations, medical stations), underground production workshops, warehouses, power stations, reservoirs, underground crossings, underground parking lots, underground garages and so on.