大型立交桥中深孔爆破钻孔施工控制
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摘要
对漳州东立交桥采用垂直深孔爆破法拆除,为确保安全和效果,使桥墩炮孔的实际最小抵抗线不小于设计最小抵抗线的90%,采取了两级钻孔方案,并对钻孔全过程进行精确控制。孔口测量定位、钻机严格定位、钻孔施工全程监控并及时调整,最后进行严格验孔。经严格控制钻孔施工质量,漳州东立交桥拆除爆破达到了预期效果,爆破中没有产生飞石危害。工程实践表明:通过严格控制垂直深孔的钻孔精度,可大大提高垂直深孔拆除爆破的效率和安全。
The overpass of Zhangzhou East was demolished by vertical deep hole blasting method. To keep the safety and blasting effect,the two stage drilling programs were taken to control the actual min-burden deviation of the pier hole less than 10% of the designed value along the whole drilling process,such as surveying and positioning of hole location,driller positioning,drilling process monitoring and timely adjustment,finally the holes should be inspected strictly. By controlling the construction drilling quality,the desired effect was obtained in the demolition of Zhangzhou East overpass without flyrock hazard. The practice showed that the strict control of vertical accuracy can greatly improve the efficiency and safety of blasting with vertical deep-holes in large cross bridge.
The overpass of Zhangzhou East was demolished by vertical deep hole blasting method. To keep the safety and blasting effect,the two stage drilling programs were taken to control the actual min-burden deviation of the pier hole less than 10% of the designed value along the whole drilling process,such as surveying and positioning of hole location,driller positioning,drilling process monitoring and timely adjustment,finally the holes should be inspected strictly. By controlling the construction drilling quality,the desired effect was obtained in the demolition of Zhangzhou East overpass without flyrock hazard. The practice showed that the strict control of vertical accuracy can greatly improve the efficiency and safety of blasting with vertical deep-holes in large cross bridge.
引文
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[2]赵明生,龙源,贾永胜,等.预应力混凝土连续梁桥控制爆破拆除[J].爆破,2015,32(4):103-109.ZHAO Ming-sheng,LONG Yuan,JIA Yong-sheng,et al.Control blasting technology for bridge with prestressed continuous concrete beams[J].Blasting,2015,32(4):103-109.(in Chinese)
[3]高黎,张英才,袁绍国.连霍高速天桥爆破拆除技术[J].爆破,2014,31(3):110-113.GAO Li,ZHANG Ying-cai,YUAN Shao-guo.Explosive demolition of Lian-Huo highway overpass bridge[J].Blasting,2014,31(3):110-113.(in Chinese)
[4]魏忠义,邵鹏.沛城东风桥爆破拆除[J].爆破,2014,31(2):115-117.WEI Zhong-yi,SHAO Peng.Explosive demolition of Peicheng Dongfeng bridge[J].Blasting,2014,31(2):115-117.(in Chinese)
[5]徐鹏飞,盖四海,张英才.运行中的高速公路跨线桥梁的拆除爆破[J].工程爆破,2014,20(3):16-19.XU Peng-fei,GAI Si-hai,ZHANG Ying-cai.Demolition blasting of flyover over the running highway[J].Engineering Blasting,2014,20(3):16-19.(in Chinese)
[6]谢先启.城市高架桥精细爆破拆除[M].北京:科学出版社,2013:149-150.
[7]刘殿中.工程爆破实用手册[M].北京:冶金工业出版社,1999:366-367.
[8]汪旭光.爆破设计与施工[M].北京:冶金工业出版社,2011:235-236.