To question of providing of safe exploitation of metallic constructions in hearth of fire

Abstract

Purpose. Increase of safety of build objects due to the decline of fire hazard of metallic constructions. Methodology. Standard methods of research and “Method of experimental determination of increase of fire-resistance of build constructions, groups difficult combustible and combustible hard materials”. Findings. Questions, related to providing of safety workings on objects due to the decline of combustibility of build materials and increase of safety of exploitation of build constructions, are lighted up in the article. Metallic unscreened constructions at high temperature influence accumulate plenty of thermal energy, as a result they lose bearing strength the loss of which results in their bringing down. Bringing down of constructions is diminished by the amount of ways of evacuation, results in injuring and death of people. For providing of safe exploitation of metallic constructions in extreme terms at high temperature influence were conducted research on development of new protective spumific compositions. Researches rotined that a change protective ability, adhesion strength, technological parameters, depended on maintenance of components in protective compositions. In the process of researches constituents are certain and dependences of influence of content of components are set on protective, adhesion properties, on the processes of making foam of coverage in the process of high temperature influence and other parameters. As a result of multivariable analysis mathematical models which set dependences of warming up of metal with coverage to the critical temperature from content of incoming components were got, at the set thickness of coverage. Originality. Dependences of influence of incoming components are set in protective compositions and thicknesses of coverage on the dynamics of warming up of metal to the critical temperature at standard development of fire. Mathematical dependences of influence of incoming components and thickness of coverage on the change of fireproof ability of coverage are got. Practical value. On the basis of the conducted researches effective compositions, allowing to promote safety of build objects, safety of evacuation of people and safety wrecking due to the decline of combustibility of materials and increase of fire-resistance of the applied constructions, are developed.