摘要
为了消除一座复杂环境下350m钢筋混凝土危桥的安全隐患,根据桥梁周边环境和拆除难点,采用对桥梁的墩柱和横梁进行爆破的方案进行爆破拆除。通过微差控制爆破降低爆破振动,设置最小抵抗线方向背离近岸保护对象、桥台下设置土坎、待爆体采用细孔钢丝网及三层竹笆覆盖以控制爆破飞石。爆破效果表明:爆破振动对周边保护对象未造成影响,爆破拆除工作安全、可靠、达到预期目标,可为类似工程提供参考。
In order to eliminate the potential safety hazard of a 350m reinforced concrete bridge in complex environment,according to the surrounding environment and demolition difficulties of the bridge,the blasting demolition scheme of pier and beam of the bridge is adopted.The blasting vibration is reduced by millisecond controlled blasting,the minimum resistance line is set away from the coastal protection object,the earth sill is set under the abutment,and the blasting body is covered with fine hole steel wire mesh and three-layer bamboo fence to control the blasting flying rock.The blasting effect shows that the blasting vibration has no influence on the surrounding protection objects,and the blasting demolition work is safe,reliable and achieves the expected goal,which can provide reference for similar projects.
作者
李文俊
LI Wen-jun(Geological Team of Anhui Bureau of Geology and Mineral Exploration,Hefei Anhui 230011,China)
出处
《西部探矿工程》
CAS
2021年第7期195-198,共4页
West-China Exploration Engineering
关键词
复杂环境
桥梁拆除爆破
参数设计
原地坍塌
安全防护
complex environment
blasting demolition of bridge
parameter design
in-place collapse
safety protection