Anti-theft door breaking method by using freezing pressure of water and low-temperature cold brittleness of steel plate

Abstract

The invention discloses an anti-theft door breaking method by using freezing pressure of water and low-temperature cold brittleness of a steel plate. By determining the reasonable water injection position, strong restraint conditions are formed in a door body, and a water injection device is connected to perform water injection operation on an upper water injection hole and a lower water injectionhole respectively; liquid nitrogen is injected into the upper part and the lower part to form closed ice walls on the upper part and the lower part in the door body; according to the freezing critical point below the upper water injection hole at the critical position of frosting outside the door body steel plate, a second operation hole is constructed; water and liquid nitrogen are injected to the middle spaced space through the second operation hole, icing compression is thus formed in the middle closed area to enable the steel plate to be expanded and cracked and deformed, a door body lockpoint is separated from a door frame, and breaking is completed. The method mentioned in the invention can be executed by two rescue workers, wall breaking and door body cutting are not needed in thecase of rescue, the operation is safe and efficient, and the breaking efficiency is greatly improved.

Description

technical field [0001] The invention relates to a method for dismantling an anti-theft door, in particular to a method for dismantling an anti-theft door using the freezing pressure of water and the cold and brittle properties of steel plates at low temperature, and belongs to the technical field of fire protection and rescue. Background technique [0002] As a building facility commonly installed in urban residential buildings, anti-theft safety doors are mostly extruded steel plates made of cold-rolled steel plates as the inner and outer door panels. The thickness is mostly 1.2 mm and 1.5 mm, with strong impact resistance, and has the functions of anti-theft, fire prevention, heat insulation, and sound insulation. The quality of the current anti-theft doors is produced in accordance with the national testing standard: GB 17565-2007 "General Technical Conditions for Anti-theft Safety Doors". This kind of anti-theft safety doors can greatly improve the safety factor of resid...

AI Technical Summary

Problems solved by technology

However, when a fire or other dangerous situation occurs, as the overall quality of the security door becomes higher and higher, it also increases the difficulty of demolition for firefighters to attack and close combat and open up life-saving passages.

At present, in the process of fire rescue, traditional measures such as sawing, impacting, prying or pulling are difficult to work. The disadvantages are: (1) combustibles are often trapped in the door panel, and forced demolition will cause new safety hazards; ( 2) The anti-theft door is updated quickly, and the anti-destruction ability is greatly improved. The existing demolition technology is difficult to accurately demolish all types of anti-theft doors; (3) The time required for demolition is long, and it is difficult to meet the needs of emergency rescue

Therefore, the demolition of the anti-theft safety door has become a constraint for fire emergency rescue and indoor personnel escape, which brings difficulties to the rapid fire rescue work.

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