刘士兵;郑永泽;贺攀;程赛珍;
LIU Shi-bing;ZHENG Yong-ze;HE Pan;CHENG Sai-zhen;Hunan Nanling Civil Blasting Engineering Co.,Ltd.;

• 1:湖南南岭民爆工程有限公司

摘要(Abstract)：

待拆除大桥长334m,主跨为钢筋混凝土刚架拱桥,引桥为圆柱形桥墩简支梁桥。由于桥体主结构承载力不能满足安全要求,需要爆破拆除。结合切口设计和"移位偏角"方式为圆柱形桥墩、拱肋确定了合理的爆破切口高度及有关参数,采用毫秒分段延时技术降低一次性齐发药量,运用逐点起爆非电起爆网路确保桥体逐垮塌落,通过立体式防护挡墙防止爆破飞石的扩散。结果表明,移位偏角法、逐点起爆非电起爆网路、立体式防护挡墙的运用,实现了桥梁按设计要求倒塌,有效控制了爆破冲击波、桥体塌落振动、爆破飞石及飞溅物、浪涌等爆破危害效应,爆破取得了理想效果。
Bridge to be dismantled is 334 mlong,the main span is the reinforced concrete rigid frame arch bridge,approach bridges are the cylindrical bridge simply supported beam bridge.Demolition of the bridge due to the main structure bearing capacity cannot meet the safety requirements.Combined with incision design and "displacement slip angle" mode for the cylindrical pier,a reasonable blasting incision height and related parameters of arch ribs were determined.The millisecond delay time technology was used to reduce the charge amount one time.The point-by-point non-detonation network ensured that the collapse of the bridge body,and the three-dimensional protective wall prevented the spread of blasting flying socks.The results showed that the displacement slip angle method,point-by-point detonation non-electric detonation network,the use of three-dimensional protective retaining wall achieved the collapse of the bridge according to design requirements,effectively controlled the blasting shock wave,bridge collapse vibration,splash,surge and other blasting hazards.It achieved a desired result.

关键词(KeyWords)： 刚架拱桥;圆柱桥墩;爆破拆除;移位偏角;复杂环境
rigid frame arch bridge;cylinder-shaped pier;blasting demolition;displacement slip angle;complex environment

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 刘士兵;郑永泽;贺攀;程赛珍;
LIU Shi-bing;ZHENG Yong-ze;HE Pan;CHENG Sai-zhen;Hunan Nanling Civil Blasting Engineering Co.,Ltd.;

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