Study On Demolition Principle And Application By Explosion Cutting For Extra Large Steel Structure Building

Abstract:The demolition principle and application by explosion cutting for extra large steel structure building is studied in this paper. More and more buildings, with the rapid development of national economy, are constructed by steel structure, such as some famous landmark like the Bird’s Nest, the Water Cube in Beijing and the Jin Mao Tower, the World Financial Center in Shanghai, as well as plants, bridges, airport terminals, high speed rail stations, convention centers, stadiums, and so on with a large number. On the other hand, the service life of these buildings in early time is drawing near, which makes the demolition technology have become a new research topic. There is an urgent demand to find a new method to get rid of the dilemma that traditional blasting technology is out of capability for steel structure building while the mechanical or chemical cutting technology widely used in the small size neither can meet the requirement of the large scale.It is a common effective but also special demolition model using linear shaped cutting charge technology in recent ten years. Even so, quite a few technique problems, especially some key links, need to overcome if these demolition tasks want to be performed safely and successfully since there are few precedents before. For example, innovative technical breakthrough is the desideratum in studying the pretreatment security and toppling reliability, the design of linear shaped charge cutter and the safety precautions of large adobe blasting in downtown area. Starting with the research status of these three techniques and the problems urgent to work out, demonstration study, based on the massive structure stability for the pretreatment security, is being carried out with theory method and finite element method. Same approach is applied to analyze the reliability of steel structure directional collapsing, which obtains a calculation method to choose reasonable blasting height. Our further research focuses on the cutter parameters applied to the explosion cutting demolition engineering of extra large steel structure, after which the model and means optimizing the structure parameters are determined. Hazardous effects from large adobe charge in the engineering are also discussed. Several methods such as theoretical model, numerical simulation and experiment analysis are used to put forward creative precautions and study further on the effectiveness. All achievement above is applied into the Shenyang Lvdao indoor stadium engineering as one of the largest scale explosion cutting demolition in the world, which makes the technology up to an unprecedented height.