How to improve the production technology of fire door manufacturers

When the wind load intensity exceeds the design wind resistance of the building, the wind pressure will cause the building to collapse, and the negative pressure will cause the roof to be lifted away. For example, the negative pressure caused by fire door manufacturers is an important reason for the destruction of many buildings, such as Liu Shaoqun, etc. Quan Yong and Gu Ming found that most of the four types of civil houses with weak wind resistance stiffness, such as wood frame, brick wood, stone wood and brick concrete structure, collapsed in the wind disaster; The old wooden structure houses are seriously damaged by wind. When attacked by typhoon with low strength, the main structure of masonry and frame will not be seriously damaged, but the roof, window or floor may be damaged; Masonry and frame main structures are also spared when they are attacked by strong typhoons. The building roof, windows and other envelope structures are prone to wind damage. Damage mechanism of wind load on wind disaster vulnerable structures wind disaster vulnerable structures refer to some easily damaged structures in the city, such as glass curtain walls of high-rise buildings, outdoor signs, external units of air conditioners, transportation system and urban green, etc. they are the weak links in wind disaster prevention, AI Xiaoqiu and Qin Xing.

The wind mainly destroys buildings, bridges and roads, leading to traffic and communication interruption, blowing down urban street trees and signs, damaging urban green, blowing down flower pots and sundries on the balcony, injuring pedestrians, and even causing painful personal casualties. Wind disaster also destroys the power supply system on the ground of the city. In addition to the direct loss, the indirect loss caused by power failure is also very old. In general, the city and wind disaster are caused by kinds of external forces acting on the urban material space and its personnel, and the law of these external forces in the time domain is not obvious, and the time and place are random. Due to the wide range of influence and huge force of the wind disaster, the fire door manufacturer makes the exposure and vulnerability of the disaster bearing body occur at the same time, which will produce serious disasters such as material loss and casualties. According to the basic principles and basic principles of urban disaster prevention, the general countermeasures of urban disaster prevention in urban planning and urban disaster prevention planning are summarized as follows. The disaster prevention countermeasures against air pollution the urban development model decentralized suburban development is developed from the perspective of reducing exposure and vulnerability. The decentralized development model of alkali city is proposed to reduce the urban construction density and population density, so as to avoid the goal of and reduce casualties and losses.

Concerned about the serious consequences of the threat, cities are places where people and property are relatively concentrated and places hit by war. Therefore, the decentralized suburban development model, such as satellite city, has become the main urban spatial structure of the United States and the Soviet Union. The Soviet Union planned new towns as scattered cities and replaced Lezhong cities with suburbs; When transforming the current city, fire door manufacturers build wide streets and artificial reservoirs, surround the city's expressway network, and reduce the building density, so as to reduce possible and fire losses Zhang Hanqing. However, modern has changed from scale to attack, which makes the development mode of decentralized cities deal with meaningless evacuation and refuge. The planning and construction of civil air defense engineering starts from the angle of reducing exposure and vulnerability, evacuating people and covering up on site, so as to reduce vulnerability. At present, the Countermeasures of urban air defense war are mainly through the planning and construction of civil air defense engineering system, so as to protect important objectives and preserve effective forces, determine civil air defense construction standards and objectives according to relevant laws, door regulations and technical standards in cities, combined with the actual situation of local cities, and guide the development and construction of civil air defense and underground space through civil air defense engineering planning, Meet the corresponding field indicators and standards.