Steel structure water injection fireproof protection method

Abstract

The invention discloses a steel structure water injection fireproof protection method which comprises the steps that when a fire occurs, the outer surface of a steel structure body is directly exposedto flames to heat the steel structure body; the outer surface of the steel structure body is heated by fire to conduct heat to the inner surface of the steel structure body; a cavity in the inner surface of the steel structure body transfers heat to cooling water in a water injection pipe through heat convection, and parameters in the cooling water in the water injection pipe are tested; test data of the cooling water flowing in the water injection pipe is analyzed and processed through a least square method to obtain a heat exchange criterion relational expression in the water injection pipeand a Fanning friction coefficient criterion relational expression; through establishment of the relational expression, the minimum driving force and the minimum water flow of the steel structure body needing to be protected by cooling water in the water injection pipe when a fire occurs are judged. By means of the scheme, the purpose of fireproof protection of the steel structure is achieved, and high practical value and popularization value are achieved.

Description

technical field [0001] The invention belongs to the technical field of fire protection, and in particular relates to a water injection fire protection method for a steel structure. Background technique [0002] Most of the existing buildings are built with steel structures, among which, steel structure buildings have good earthquake resistance, which is also the reason for the rapid development of steel structure buildings. However, because the traditional fire protection method is to wrap the fire retardant coating on the outside of the steel structure, and because the fire retardant coating ages and loosens or falls over time, when a fire occurs, the aging fire retardant coating cannot protect the steel structure. The steel structure is effectively protected. As the fire occurs, the indoor temperature becomes higher and higher, and the flame burns the surface of the steel structure, causing the steel structure to become unstable and deform due to excessive temperature, res...

AI Technical Summary

Problems solved by technology

However, because the traditional fire protection method is to wrap the fire retardant coating on the outside of the steel structure, and because the fire retardant coating ages and loosens or falls over time, when a fire occurs, the aging fire retardant coating cannot protect the steel structure. The steel structure is effectively protected. As the fire occurs, the indoor temperature becomes higher and higher, and the flame burns the surface of the steel structure, causing the steel structure to become unstable and deform due to excessive temperature, resulting in the collapse of the steel structure.

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