Study On The Main Effect Factors Of Demolition Of Brick-concrete Structure Building By Blasting

d. TheWhen the supporting members of construction lose the capability of bearing, the construction will generates overturning moment by the gravitation of itself, which will make it collapse, and disintegrates in this process, and this is named as the gravity action theory, which includes two key questions that one is the conditions of buckling and collapsing and the other is the failure method of the supporting members. In this paper, by the practice of NO.6 teaching building demolition with blasting in NCIT, the main factors that affect how to succeed in demolishing brick-concrete structure building such as pretreatment of bearing wall and firing circuit are deep studied, and some practical conclusions are drawn.The calculation and simulation of the blasting pretreatment of bearing wall is done with the finite element software, and the stress distribution is analyzed. In the premise of acquiring the maximal profit, the factors such as the stress effect, the ratio of height and thickness, the effect of linear eccentricity and mechanical vibration and the wind load are considere arch shape curve formula and the optimum stability coefficient value of blasting pretreatment of bearing wall are provided. The common model of elliptical and rectangular shape in blasting practice is analyzed, and the corresponding calculation equations are referred, providing fundamental basis for the blasting practice.On the basis of the present merit and defect of firing circuit analyzed, the check formula on exact explosion of the parallel-series connection is provided according to the parameters of blasting supplies and optimized with calculation. A new series-parallel-series firing circuit is designed, and a reliability formula of the electric and non-electric circuit is presented. The reliability of the circuit can be ensured through calculation and practice and has important applied value.