The construction of civil air defense engineering has become an important part of urban construction. Some cities have proposed to change their old concepts in carrying out urban construction work, emphasizing the underground and neglecting the above ground, and incorporating underground space planning into the overall urban planning. However, to fully leverage the combined function of civil air defense engineering during peacetime and wartime, strict control is required from the design stage to eliminate most of the engineering problems, Ensure that the construction quality of civil defense buildings meets the requirements of national civil defense engineering construction standards..
Due to some design drawings not indicating that the cover plate of the collection pit is a protective well cover, ordinary iron grates are used as the top cover of the collection pit in actual engineering. When the outside world encounters an air attack, the shock wave will pass through the connecting pipeline and act on the explosion-proof floor drain. The working principle of the explosion-proof floor drain is to only prevent the frontal shock wave from hitting, which is equivalent to the shock wave passing through the first protective closed door with the highest resistance at the engineering entrance, Directly entering the anti virus channel or enclosed channel will cause certain damage to the internal facilities of the channel, and cannot effectively prevent external toxins from entering the interior of the project, seriously affecting the wartime use function of civil defense engineering..
The building materials do not meet the fire protection standards. Many civil defense construction units, in order to save construction costs, do not choose building materials according to the construction standards of civil defense buildings. The selected building materials not only do not have fire prevention functions, but many are also combustible materials, which further increases the fire hazards of civil defense buildings. At the same time, with the development of civil defense buildings, the management and maintenance of civil defense buildings have not kept up with the pace of development. The management and maintenance of various equipment in civil defense buildings have not formed a normal work. Some units, in order to save costs, have seriously insufficient fire protection facilities in civil defense buildings. Although some civil defense buildings have fire protection facilities, they have not been replaced for many years and have been scrapped and ineffective. When a fire occurs, they cannot play their due role. Some electrical equipment is outdated and out of repair, severely aging, and prone to accidents, leading to fires in civil defense buildings..
The effective volume of the wartime domestic sewage collection tank should include the regulating volume and storage volume. The regulating volume should not be less than the maximum output of a sewage pump for 5 minutes. Therefore, when selecting a submersible pump, it should be matched with the collection pit. The storage capacity of the dry toilet collection pit must be greater than 1.25 times the total amount of sewage generated during the isolation and protection period. If the reserve capacity needs to be utilized in normal times, it should be able to be emptied before the battle. The collection pit should also meet the requirements for setting up submersible pumps, installing and inspecting water level controllers, etc; The minimum water level designed should meet the water pump suction requirements. The submersible pump is also used as a drainage pump for firefighting wastewater during peacetime and wartime. The firefighting drainage capacity can be calculated based on 80% of the firefighting design flow rate. When using a drainage pump to discharge firefighting water, it can be designed based on the drainage capacity of both submersible pumps operating simultaneously in the same fire compartment. A collection pit for wartime use only can be drained using a mobile water pump after being hit by an air raid..
(1) The explosion-proof valve cannot prevent nuclear, chemical, or biological warfare agents (toxic gases) from seeping into the project through pipelines outdoors. This valve cannot meet the protection requirements of both shock wave and nuclear, chemical, or biological warfare agents simultaneously. When the shock wave is in the same direction as the water flow, the water flow pressure is greater than the shock wave pressure, which will cause the baffle to close and affect normal use; When the direction of the shock wave is opposite to the direction of the water flow.
