跨航道桥梁的爆破拆除
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摘要
某桥梁为中承式钢筋混凝土肋拱桥,周边环境复杂。为了快速的对跨航道桥梁进行爆破拆除,并控制爆破有害效应对周边环境的影响。采用协同爆破技术,桥台前台、支柱、桥面及拱肋采用浅孔爆破,部分空心拱箱采用水压爆破,引桥跨采用液压破碎锤进行二次破碎。采用复式交叉及网路跳线技术保证了起爆网路的可靠性,控制同段药量及起爆顺序减小了振动效应,地毯的铺设控制了飞石,预湿、灌水处理减弱了粉尘危害,控制桥梁倒塌顺序减弱了涌浪危害,达到了较好的爆破效果。
The bridge with a half-through suspender arch is crossing navigation channel with complex environment. In order to implement a quickly demolition without harmful effects on the environment,the cooperative blasting technology was applied. The shallow hole blasting was adopted on the bridge's abutment,pillar,bridge deck and arch rib. The water pressure blasting was used in some hollow arch boxes,and the hydraulic crushing hammer was used to break up approach spans. The reliability of the detonating network was guaranteed by using double cross-over and network jumping technology. The vibration effect was reduced by controlling the maximum initiating charge and the order of initiation. The fly-rock was controlled by laying a carpet. The wetting and irrigation treatments were used to weaken the dust. Furthermore,the surge was weakened and good blasting effect was achieved.
The bridge with a half-through suspender arch is crossing navigation channel with complex environment. In order to implement a quickly demolition without harmful effects on the environment,the cooperative blasting technology was applied. The shallow hole blasting was adopted on the bridge's abutment,pillar,bridge deck and arch rib. The water pressure blasting was used in some hollow arch boxes,and the hydraulic crushing hammer was used to break up approach spans. The reliability of the detonating network was guaranteed by using double cross-over and network jumping technology. The vibration effect was reduced by controlling the maximum initiating charge and the order of initiation. The fly-rock was controlled by laying a carpet. The wetting and irrigation treatments were used to weaken the dust. Furthermore,the surge was weakened and good blasting effect was achieved.
引文
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[10]甄梦阳,李本伟,陈德志,等. 1160 m长城市高架桥爆破拆除[J].爆破,2017,34(2):91-95.ZHEN Meng-yang,LI Ben-wei,CHEN De-zhi,et al. Explosive demolition of 1160 m long urban viaduct[J].Blasting,2017,34(2):91-95.(in Chinese)
[2]孙金山,姚颖康,吴亮,等.高架桥混凝土多室箱梁水压爆破破碎机理数值模拟[J].爆炸与冲击,2017,37(2):299-306.SUN Jin-shan,YAO Ying-kang,WU Liang,et al. Numerical simulation of water-pressure blasting mechanism in breaking viaduct box girder[J]. Explosion and Shock Waves,2017,37(2):299-306.(in Chinese)
[3]汪旭光.爆破设计与施工[M].北京:冶金工业出版社,2011.
[4]张云鹏,于亚伦.水压爆破药量计算体积公式[C]∥第8届中国工程爆破学术经验交流会,2004:474-477.ZHANG Yun-peng,YU Ya-lun. Volume formula for calculating the quantity of explosive charge in water pressure blasting[C]∥The Eighth China Exchange Conference on the academic experience of Engineering Blasting,2004:474-477.(in Chinese)
[5]梁开水,赵翔,张志旭.导爆管起爆网路可靠度分析[J].爆破器材,2006,35(5):22-24.LIANG Kai-shui,ZHAO Xiang,ZHANG Zhi-xu. Analysis on the reliability of nonel initiating network[J]. Explosive Materials,2006,35(5):22-24.(in Chinese)
[6]井红兵.桥梁爆破拆除方案的设计[J].交通建设与管理月刊,2014(12):228-230.JING Hong-bing. Design of blasting demolition of bridge[J]. Transport Construction&Management,2014(12):228-230.(in Chinese)
[7]郑得胜.混凝土连续箱梁拆除施工[J].交通科技与经济,2007,9(1):83-85.ZHENG De-sheng. Construction of demolishing continuous concrete box girder[J]. Technology&Economy in Areas of Communications,2007,9(1):24-26.(in Chinese)
[8] GB6722—2014爆破安全规程[S].北京:中国标准出版社,2014.GB 6722—2014 Safety regulations for blasting[S]. Beijing:China Standards Press,2014.(in Chinese)
[9]苌江,刘文泉,史雅语.爆破抛石涌浪的形态与危害及其防范[J].工程爆破,2001,7(1):83-88.CHANG Jiang,LIU Wen-quan,SHI Ya-yu. Form and harm of surge aroused by blasting throwing stone and preventive measures[J]. Engineering Blasting,2001,7(1):83-88.(in Chinese)
[10]甄梦阳,李本伟,陈德志,等. 1160 m长城市高架桥爆破拆除[J].爆破,2017,34(2):91-95.ZHEN Meng-yang,LI Ben-wei,CHEN De-zhi,et al. Explosive demolition of 1160 m long urban viaduct[J].Blasting,2017,34(2):91-95.(in Chinese)