A method for demolishing concrete in a frame structure to be dismantled by pre-moisture heat blasting

Abstract

The invention discloses a method for pre-damping thermal blasting demolition of concrete in a to-be-dismantled area of a frame structure. The concrete in a member-to-be-dismantled area is fully soakedin advance, then an external heat source higher than 500 DEG C is used for grilling the surface of the infiltrated concrete to enable temperature of the concrete to be more than 300 DEG C, pore waterin the concrete is rapidly gasified under the action of the sharp high temperature sharply, strong vapour pressure is generated in the concrete, so that the concrete is subjected to rapid burst stripping layer by layer from the surface to the interior until a steel reinforcement framework is completely exposed; and hooping is removed and longitudinal bars are cut off, and finally, a plain concrete body in the steel reinforcement framework is dismantled. According to the method for the pre-damping thermal blasting demolition of the concrete in the to-be-dismantled area of the frame structure,the problem that the stripping of the concrete and the steel reinforcement framework is difficult is effectively solved; the integrality of members is ensured, at the same time, the rapid stripping ofthe reinforced concrete is realized, and the possibility is provided for subsequent secondary assembling; and the dismantling efficiency is greatly improved, the dismantling construction period is shortened, the generation of building material waste and dust can be reduced, the construction noise is avoided, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for dismantling a frame structure building, in particular to a method for demolishing concrete in a frame structure to be dismantled area by pre-moist heat explosion. Background technique [0002] At present, our country is in the accelerated stage of industrialization and urbanization. In the process of urban transformation, there are often contradictions between existing buildings and urban planning. A large number of frame structure buildings have to be demolished due to planning reasons. Traditional controlled blasting is a complete destruction of the structure, which will cause a lot of waste of resources and environmental pollution. Therefore, how to fully explore the potential of these buildings to be demolished, and how to deal with these buildings to be demolished in an efficient and green manner are current problems that need to be solved urgently. [0003] In order to solve the above problems and realize th...

AI Technical Summary

Problems solved by technology

However, for the beam-column members of the cast-in-place frame structure, the longitudinal bars and stirrups of the steel skeleton are densely distributed on the surface of the members. During the drilling operation, the drilling cannot completely avoid the steel bars, which brings about the problem that the demolition work cannot be carried out.

Even if the coring machine is used to cut off the unavoidable steel bars and the drilling is successful, the last process will only cause slight swelling and cracking of the concrete. Due to the constraints of the steel skeleton, the cracks caused by the expansion force are difficult to expand. The skeleton cannot be stripped, so the removal of stirrups and the cutting of longitudinal reinforcements cannot be performed

All in all, static crushing is an effective method for crushing and demolishing rock and plain concrete, but it cannot be directly applied to the demolition of reinforced concrete

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