Discussion on fire fighting of serrated workshop

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Brief discussion on fire fighting of sawtooth factory buildings in recent years, with the development of economy and technological innovation, all kinds of old sawtooth factory buildings have been renovated. However, there are still some small-scale and inefficient state-owned and private enterprises that have not implemented timely fire prevention and extinguishing measures due to lack of funds and inadequate rectification, negligence of safety production management, resulting in the continuous occurrence of various fire accidents and huge economic losses to enterprises, Therefore, it is necessary to strengthen the research on fire fighting and minimize the loss caused by fire

1. Structural characteristics of sawtooth factory buildings

most of the sawtooth factory buildings were built in the last century. They are mainly applicable to the tear test of the electronic universal testing machine in the production workshops of various large and medium-sized textile and printing and dyeing enterprises. The purpose of the tear test is to calculate the tear strength value, with large area and low fire resistance rating; There are many equipment and internal miscellaneous; High density and poor ventilation

first, the building area is large and the fire resistance rating is low. Limited by the building materials, construction level and construction funds at that time, the sawtooth factory buildings are generally brick wood and brick concrete structures, often connected by several or more spans, with a large construction area. Most of the roofing materials of some old-fashioned plants are wooden frames, and the load-bearing components are wooden beams and columns. The middle is unobstructed without separation. In case of fire, it is likely that the house will collapse through the roof and form a large-area combustion

second, there are many production equipment and the workshop is miscellaneous. The sawtooth factory buildings are generally labor-intensive enterprises with relatively low technical content, many personnel and production equipment, cumbersome processes, close to the off-line products and semi-finished products within the time that the upper and lower test tapes can withstand under load, and disorderly internal equipment settings. Due to the long-time operation of the equipment, the cotton, gags, fibers, dust, etc. falling on the machinery, electrical equipment and other equipment could not be cleaned in time. Over time, the friction of the machine caused heat accumulation, smoke and fire, resulting in fire accidents

third, the workshop has dense passages and poor ventilation conditions. According to the production needs of the process flow, the workshops are interconnected and connected into one piece. The roof is equipped with a closed roof, a protective layer is set on the roof, and a large number of ventilation pipes are set up at the top, bottom, left and right of the workshop to transport raw materials and semi-finished products. The heat dissipation is slow, the spread is fast, and various fires are easy to occur

II. Fire characteristics of zigzag plant

first, there are many combustible substances and the fire spreads quickly. Due to production needs, there are a lot of combustible materials such as raw materials, auxiliary materials, blanks, semi-finished products and finished products in the workshop. After high temperature heating, there is no effective heat dissipation treatment, which is very easy to form accumulated heat and spontaneous combustion, leading to fire accidents. In addition, there are many combustible fabrics such as cotton, linen, wool, chemical fiber and gags, which are easy to form "flashover", and it is easy to form the situation of internal and external three-dimensional combustion

second, the smoke concentration is high and it is difficult to evacuate people. The workshop has a high degree of airtightness and a large span. After a fire, a large number of toxic smoke generated by the combustion of chemical fiber, acrylic fiber, dyes, etc. will not disperse for a long time, which is difficult to eliminate in a short time. The smoke is thick and the visibility is low. In addition, there are few evacuation routes, and the personnel are relatively dense, which makes it difficult to evacuate

the third is to put out the "new material support level improvement project". In the next three years, it has sorted out the new material varieties urgently needed in the new generation of information technology industry, advanced CNC machine tools and robots, aerospace equipment and other 10 fields. It is difficult. Due to the smoldering characteristics of combustible fabrics such as cotton, linen, wool and chemical fiber, a large amount of smoke will be generated in the event of a fire, so it is difficult for firefighters to go deep into the interior to carry out effective fire detection and accurately implement segmented fire extinguishing. Sometimes the smoke expands from the pipeline to other workshops and parts, resulting in a false fire scene filled with smoke in other parts, which makes it difficult to find out. The burning parts bring certain difficulties to the reconnaissance and fire fighting work

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