Resource-Saving Technology for Dismantling the Supporting Decking of Reinforced Concrete Ribbed Slabs during Reconstruction and Demolition of Buildings

Introduction. Construction industry is currently in need of resource-saving technology that allows dismantling of coatings during reconstruction and demolition of buildings with maximum preservation of the integrity of reinforced concrete ribbed slabs for them to be possibly reused for their intended purpose, thereby not only preventing environmental pollution with construction waste, but also saving energy, labor and material resources for their disposal, as well as for reproduction of slabs.
Materials and Methods. While developing resource-saving technology, a set of methods and means for solving each of the tasks was used, including:
– visual inspection of reinforced concrete ribbed slabs during dismantling of the supporting deck of the roof in order to identify their suitability for them to be reused for their intended purpose;
– identification of the parameters of the equipment required in order to release seams and joints between slabs from mortar and concrete based on a study of the factors affecting the filling of seams and joints;
– identification of the parameters of special grips and devices for lifting ribbed slabs with damaged slinging loops using physical and computer models.
Results. As a result of the research, a new resource-saving technology for dismantling the load-bearing flooring of reinforced concrete ribbed slabs was proposed which is based on the methods developed by the authors:
- mechanical removal of the material filling the seams and joints between the slabs and the established parameters of the necessary equipment;
- release of the slabs from the existing connections with the rafter beams and cover trusses; 
- testing of the remaining slinging loops of the slabs;
- slinging of slabs with damaged slinging loops with specially designed load-gripping devices.
Discussion and Conclusions. The new resource-saving technology allows dismantling the load-bearing reinforced concrete decking without additional damage to the slabs with them possibly being reused with a minimum amount of waste, saving labor and material resources, significantly reducing energy costs that would be required for the disposal of reinforcement waste and crushing concrete. 

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