1.0.1 This code is formulated according to the current "Service Requirements for Civil Air Defense Works" to design the civil air defence basement (hereinafter referred to as "air defence basement") such to meet the wartime and peacetime function requirements and make it safe, applicable, economical and appropriate.
1.0.2 This code is applicable to the newly-built or reconstructed Categories A and B air defence basements of the following resistance grades and the Categories A and B single open civil air defence works in the residential quarter combined with the civil building construction.
1 Basement against Grades 5 and Grade 6 conventional weapons (hereinafter referred to as "Grade 5 conventional weapons" and "Grade 6 conventional weapons" respectively);
2 Basement against Grade 4, Grade 4B, Grade 5, Grade 6 and Grade 6B nuclear weapons (hereinafter referred to as "Grade 4 nuclear weapon", "Grade 4B nuclear weapon", "Grade 5 nuclear weapon", "Grade 6 nuclear weapon" and Grade 6B nuclear weapon").
Note: Unless otherwise indicated, all the requirements for and the provisions about the "air defence basement" in this code are applicable to the single open civil air defence works in residential quarter combined with the civil building construction.
1.0.3 The air defence basement shall be designed such to implement the guideline of "long-term preparation, main construction and combination of peacetime and wartime" and insist on the principle of "harmonious development of civil air defence construction with economic construction and urban construction. Measures shall be taken, in such aspects as plan layout structure selection, ventilation and moisture protection, water supply and drainage and power supply and lighting, to ensure the social benefit and economic benefit are obtained to a large extent following he war preparations benefit.
1.0.4 The Category A air defence basement must be designed such to meet the planned requirements for protection of nuclear weapons, conventional weapons and biochemical weapons at the wartime. The Category B air defence basement must be designed to meet the planned requirements for protection of conventional weapons and biochemical weapons at the wartime.
1.0.5 The air defence basement shall be designed such to conform to both this code and those in the current relevant ones of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Peacetime
The short for the time of peace when the nations or regions do not suffer from wars or apparent war threat.
2.1.2 Wartime
The short for the time of war when the nations or regions enter into the warfare until the end of the warfare.
2.1.3 Imminence of war
The short for imminence of war period when the nations or regions explicitly enter into the prewar preparation until the outbreak of the war.
2.1.4 Air defence basement
The basement, having the planned air defence functions at the wartime, where the indoor ground level is over a half of the clear height of the room lower than the outdoor ground level.
2.1.5 Command works
The civil air defence works to guarantee the work of the civil air defence command authority at the wartime (including the air defence basement).
2.1.6 Works of medical treatment and rescue
The civil air defence works for making an early rescure independently for the injured (including the air defence basement), which may be divided into the central hospital, emergency hospital and casualty station in accordance with medical treatment grade and tasks.
2.1.7 Works of service team for civil air defence
The civil air defence works to guarantee service team for civil air defence to be sheltered and conduct some services (including the air defence basement), called shelter of service team for civil air defence generally. A complete shelter of service team for civil air defence consists of service team member shelters and service team device (vehicle) shelter. However, the two parts may be constructed separately in the construction of the present civil air defence works.
The service team for civil air defence consists of various professions and is responsible for the service of the civil air defense, including the service teams for emergency rescue and maintenance, medical assistance, firefighting, CBR and epidemic prevention, communication, transportation, public security, etc.
2.1.8 Personnel shelter
The civil air defence works mainly used for personnel shelter (including the air defence basement), which may be divided into two categories in accordance with the function of wartime shelter personnel: the shelter for first-class personnel, the personnel shelter for the government authority working at the wartime, the important guarantee departments for the city life (telecommunication, power supply, air supply, water supply, food, etc.), important factories, mines and other enterprises and other shelters entered by the personnel at the wartime; the shelter for second-class personnel, the shelter for the ordinary residents stayed in the city at the wartime.
2.1.9 Indemnificatory works
The indemnificatory civil air defence works at the wartime (i.e. the aggregate civil air defence works other than command works, works of medical treatment and rescue, works of service team for civil air defence and personnel shelter), mainly including the works of regional power station, regional water supply station, civil air defence storehouse, civil air defence garage, food station, production workshop, civil air defence traffic artery (branch), warning station, nuclear and biochemistry monitoring center.
2.1.10 Shock wave
The short for air shock wave, which refers to the longitudinal wave formed in the air due to the weapon explosion, having the air parameter strong discontinuity surface.
2.1.11 Positive pressure of shock wave
The pressure value higher than the atmospheric pressure nearby within the shock wave compression zone.
2.1.12 Surface positive pressure
The positive pressure peak value of the impact wave for the outdoor ground of the civil air defence basement.
2.1.13 Compressive wave in soil
The wave which propagates in soil and make the soil compressed under the explosive effect of the weapon.
2.1.14 Main part
The parts in the civil air defence basement which can meet the wartime protection and the main functions. As for the civil air defence basement protected against the gas, the main part is the part inside the innermost pass of the airtight door.
2.1.15 Airtight space
The area in the civil air defence basement which can withstand the function of the preset explosive dynamic load and meet the gas defense requirements.
2.1.16 Airtightless space
The area in the civil air defence basement which can withstand the function of the preset explosive dynamic load and is allowed to be airtightless.
2.1.17 Protective unit
The use space in the civil air defence basement where the protection facilities and internal equipment can form system by self.
2.1.18 Anti-bomb unit
The use space separated by the anti-bomb partition in the civil air defence basement (or protective unit).
2.1.19 Peacetime connected entrance
The entrance in the protective unit partition, to meet the peacetime use demand, opened for passing in peacetime and blockage in wartime.
2.1.20 Surrounding structure for civil air defence
The generic terms for the top slab, wall and bottom slab, in the civil air defence basement, bearing the direct action of air shock wave or compressive wave in soil.
2.1.21 Periphery partition wall
The wall, in the civil air defence basement, which contacts with the rock-soil on one side and directly bears the action of compressive wave in soil.
2.1.22 Blastproof partition wall
The wall, one of which is subjected to the air shock wave action and the other side of which is the inside of the air defence basement.
2.1.23 Gateway
The parts connecting the main part of the civil air defence basement with the ground surface or the other subterranean buildings. As for the civil air defence basement required for gas protection, the gateway is the part beyond the innermost pass of airtight door, e.g. diffusion chamber, airtight passage, decontamination room (simple decontamination room), dust chamber, gas-filtering room and shaft and the passage beyond the airtight blast door.
2.1.24 Outside entrance
The entrance, with the passage out of the ground (unprotected top cover section), located beyond the projection range of the upper building of the civil air defence basement.
2.1.25 Indoor entrance
The entrance, with the passage out of the ground (unprotected top cover section), located in the projection range of the upper building of the civil air defence basement.
2.1.26 Connected entrance
The entrance, below the ground, connected with other civil air defence works (including the civil air defence basement).
2.1.27 Main entrance
The entrance, which is safe and convenient, used for the personnel or vehicle to pass in and out before and after the air raid in wartime.
2.1.28 Secondary entrance
The entrance, which is mainly used before the air raid in wartime and may not be used when the surface building is damaged by the air raid.
2.1.29 Alternate exit
The entrance, which is out of service in wartime generally and used for emergency when other entrances are damaged or blocked.
2.1.30 Straight entrance
