钢筋混凝土支撑梁闷爆技术的应用OA

Conventional demolition methods for reinforced concrete support beams in urban deep foundation pit en-gineering often face challenges such as difficult control of flyrocks and vibration,significant impact of dust and noise.A safe,efficient,and environmentally friendly confined blasting technique was proposed.Support segments that obstruct the construction of the main basement structure are pre-demolished.After the basement structure is completed and reaches the design strength,the basement structure is used as an enclosed protective system to implement millisecond-delay controlled blasting on the remaining internal supports.Parameter design was refined,with an explosive consumption of 1 000-1 300 g/m3.In the joint delay network inside and outside the hole,the single hole charge is 200-400 g,and the maximum single charge is no more than 2 000 g.Blast-induced adverse effects are systematically controlled.Engineering applications de-monstrate that,in confined blasting technology,blasting flyrocks and dust are completely confined inside the basement structure,and external noise is significantly reduced.Measured peak vibration velocity during blasting is 0.225 cm/s.The concrete and rebar cage are completely separated.It provides a scalable and innovative solution for the demolition of deep foundation pit supports in complex environments.