Disaster prevention capacity of steel fire doors

The third principle of disaster prevention of steel fire doors is the current situation of many cities, which not only causes disasters, but also causes material damage. At this time, reducing casualties and protecting residents' lives is not only a low requirement, but also an important goal. Through the third principle of disaster prevention, create the conditions for the realization of the second principle of disaster prevention. The second principle of disaster prevention and the third principle of disaster prevention are all aimed at achieving the state of the principle of disaster prevention, that is, the summary of the principle of disaster threat and disaster prevention. Constituent elements and process of urban disaster prevention principle principle of vulnerable disaster disaster disaster capacity disaster bearing body disaster prevention capacity disaster capacity and spatial relationship between disaster bearing body ∩ no small non empty set, non empty set, basic principle of urban disaster prevention, principle of reducing the exposure of bearing body in the study of disaster formation, the premise condition for disaster occurrence is that the intersection of the influence range of disaster capacity and the distribution range of disaster bearing body is not empty set, That is, the disaster bearing body has a certain exposure, see formula. Therefore, changing the precondition of disaster occurrence can avoid the disaster when the action scope of disaster force is separated from the scope of urban built-up area. For example, it is a natural phenomenon that does not cause material and property losses and casualties in uninhabited desert areas, which does not constitute the exposure principle of disaster reduction carrier. First, it is required to clarify the spatial distribution and development change of disaster capacity; Secondly, when choosing the urban development direction and construction land, it is separated from the disaster impact space;, Sufficient disaster tolerance space shall be reserved to adapt to the impact scope of variable disaster force and control the boundary of urban development.

These are also the important connotation of double evaluation in China's recent soil space planning. Disasters occurring in urban aboveground space can achieve isolation effect and reduce exposure through underground space. For example, when the important facilities are placed in the underground space, the disasters and facilities are isolated from each other through the surrounding media of the underground space during the local upper space wind disaster and war air raid, so as to reduce the exposure of the disaster bearing body, reduce the disaster damage and reduce the vulnerability of the bearing body. The disaster constituent elements include disaster capacity and disaster bearing body. The influence range, intensity and frequency of disaster force will not be affected by human factors for a period of time. By changing the state of the urban material space of the disaster bearing body, reduce the vulnerability of urban space, and then reduce the urban disaster risk, so as to achieve the following objectives: ① when the disaster prevention capacity of steel fire doors is higher than the disaster capacity, the disaster will not occur; ② The disaster prevention capacity is less than the disaster force, and the disaster occurs, but the casualties are reduced through emergency evacuation and refuge. According to the analysis of the vulnerability of the disaster bearing body, as shown in the formula, the vulnerability of urban space is positively correlated with building density and plot ratio, and negatively correlated with building quality and the distribution of refuge places.

Therefore, to reduce vulnerability, we should reduce the construction scale and population scale in the affected areas, that is, reduce the material and population within the affected area; On the other hand, we should improve the construction standards of buildings and structures to resist the role of disaster without damage. Material damage is highly related to casualties. Reducing material damage can reduce casualties to a certain extent. However, when some disasters come, even if the physical space such as buildings and structures is damaged, the casualty rate may be reduced. Therefore, reduce casualties. At the level of material space construction in alkali City, steel fire doors mainly involve the construction of evacuation and refuge system, including evacuation and refuge places, evacuation and refuge roads, emergency rescue roads, emergency infrastructure and emergency support facilities. Through the development and utilization of underground space, the facilities and buildings divided into aboveground space are placed in underground space, To a certain extent, it can reduce the ground construction intensity. The buildings and structures in underground space have better resistance to wind disasters than those on the ground. It can be considered that it indirectly improves the disaster resistance standard of urban buildings and structures.