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介绍桂林市解放桥墩上结构爆破拆除的设计与施工。该桥是一座长 180m、宽15m、4墩 5跨、7肋 6波的双曲拱桥。桥下水深 2～ 7m不等。根据其受力和结构特点 ,采用控爆与机械吊装相结合的方法 ,按照平衡对称、均衡卸载的原则 ,先拆除拱上结构预制件 ,然后对拱肋、拱顶平台等拱圈部分进行全面钻孔、一次爆破 ,使其向河面方向整体塌落。总计钻孔约 85 0 0个 ,装填乳化炸药 76 5kg ,使用导爆管 1 18万发 ,导爆索 10 0 0m。用挖泥船 ,配合其他船只 ,进行水中清碴 ,用 15天时间就把主航道疏通。
The Design and Construction of Blasting Demolition of Jiefang Bridge Pier in Guilin City. The bridge is a 180m long, 15m wide, 4 pier 5 cross, 7 rib 6 wave arch bridge. Bridge depth of 2 ~ 7m range. According to its force and structural characteristics, the combination of explosion-control and mechanical lifting is adopted. According to the principle of balanced symmetry and balanced unloading, prefabricated parts of the arch structure are disassembled first, and then the arch parts such as the arch rib and the vault platform are fully Borehole, a blast, so that the direction of the overall collapse of the river. A total of about 85,000 drilling holes, filling 76 5kg emulsion explosives, the use of detonators 1 180,000 hair, detonating cord 10 0m. Use dredgers to cooperate with other vessels to carry out ballast in the water and clear the main waterway within 15 days.