复杂环境下钢筋混凝土简支梁式桥爆破拆除

发布时间：2018-03-20 12:11

本文选题：复杂环境　切入点：钢筋混凝土　出处：《爆破》2017年04期 　论文类型：期刊论文

【摘要】：介绍了城市复杂环境下钢筋混凝土简支梁式桥梁爆破拆除实例。根据待爆破桥梁自身结构特点及周围环境要求,采用浅孔爆破和深孔爆破相结合的爆破拆除施工方案。桥墩、台帽、联系梁采用浅孔爆破,南北两端承台基础采用中深孔爆破技术一次性爆破拆除。在保证桥梁结构安全的条件下,对桥梁南北两跨及部分桥面进行了预处理。为了增加桥梁构件部分空中解体效果及减少爆破后二次破碎量,起爆网路采用由北向南逐跨逐段延时起爆技术。在施工过程中进行精细化管理,对爆破参数进行优化,严格控制钻孔质量,采取有效的安全防护措施,对重点对象景观"中隔墙"采取缓冲垫层进行防护。爆破达到了预期的爆破效果,桥体空中解体较为充分,爆破有害效应没有对周边建构筑物造成影响,重点保护对象"中隔墙"完好无损。
[Abstract]:The blasting demolition of reinforced concrete simply supported beam bridges in complex urban environment is introduced. According to the structural characteristics of the bridges to be blasted and the requirements of the surrounding environment, the blasting demolition scheme of shallow hole blasting and deep hole blasting is adopted. Abutment cap, connecting beam, shallow hole blasting, middle and deep hole blasting technology are used to demolish the foundation of the north and south ends of the cap. Under the condition of ensuring the safety of bridge structure, In order to increase the effect of partial aerial disintegration of bridge components and to reduce the secondary crushing amount after blasting, the pretreatment of the two spans and some decks of the bridge is carried out. The initiation network adopts the technology of delay detonation from north to south step by step. During the construction process, the blasting parameters are optimized, the quality of borehole is strictly controlled, and effective safety protection measures are taken. The buffer cushion is adopted to protect the key object landscape "middle partition wall". The blasting achieves the expected blasting effect, the bridge disintegrates fully in the air, and the harmful effect of blasting does not affect the surrounding building structure. Focus on the object of protection, "middle partition wall" intact.
【作者单位】：甘肃省化工研究院;甘肃兰金民用爆炸高新技术公司;
【分类号】：U455.6

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