邕宁船闸口门区水下爆破施工技术研究

Construction Technology Research of Underwater Blasting in Yongning Ship-Lock Doorway Area

针对较厚淤泥层、临近挡水围堰及其他复杂条件水下炸礁施工困难的问题,采用微差控制分段爆破技术,可有效解决这一难题。邕宁航运枢纽船闸引航道水下炸礁工程,采用具有RTK功能的GPS卫星定位系统辅助钻孔,有效解决了水流速度急、水下钻孔难度大、精准率低的问题,一次钻孔到设计深度,利用礁石上淤泥覆盖层吸收爆炸产生的多余能量,降低爆破振动和冲击波的危害,同时达到了较好的爆破效果,且一次完成清渣,减少对水体多次污染。

Short delay controlled segmental blasting technology is adopted to solve difficult problems affecting underwater reef blasting under the conditions of thick silt layer, cofferdam nearby water-retaining and so on. Based on the underwater reef blasting project of Yongning junction ship-lock approach channel, GPS with RTK function is used to assist drilling, and overcome difficulties such as rapid water flow, underwater drilling and low precision. The silt cover layer on the reefs ab- sorbed the over energy of blasting so as to reduce the hazards of blasting vibration and impact wave. This technology could make the hole drill to the design depth at a time. Meanwhile, this could achieve good blasting effects and reduce the repeat- ed water pollution as well as complete slag removal at one time.