急流滩钻孔爆破施工解决方案

Solution for borehole blasting construction of rapids shoals

针对J级航段急流滩施工中出现的船舶定位、抛锚移锚、破坏炮线、钻机套管垂直度控制等施工难题,传统施工方案无法开展施工作业。通过实践总结研发一套急流滩钻机船钻孔爆破施工关键技术。综合应用模块化组合船体、七锚缆船舶定位、套管垂直导向系统、平行双滚筒锚机、起爆网路等炸礁施工关键技术,使施工船在任意航区调遣施工。在澜沧江244界碑—临沧港IV级航道整治建设工程中,航区内滩上流速为3.5~6.5 m s,险滩类型众多,采用本方案取得了良好的施工效果。在涡流、深急流等复杂条件下使用此方案,可以有效避免采用裸露爆破工艺炸药单耗高、不易控制的弊端,为急流滩施工提供了一种有效可行的施工方案。

Due to construction difficulties,such as ship positioning,anchoring and anchor removal,destruction of blasting line,and verticality control of drilling rig casing,in the construction of rapids shoals in class J sections,the traditional construction scheme is no longer applicable for construction operation.This study summarizes and develops a set of key technologies for borehole blasting construction of rapids shoals with the drilling rig ship through practice.The comprehensive utilization of the modular combination hull,ship positioning system with seven anchor cables,vertical casing guidance system,parallel double-drum windlass,initiation network,and other key reef blasting construction technologies enables the construction ship to be dispatched for construction in any navigation area.In the class IV channel regulation and construction project on Lancang River from Boundary Marker 244 to Lincang Port,the navigation area has many types of dangerous shoals,and the flow velocity on the shoals in this area is 3.5 m s to 6.5 m s.The proposed scheme achieves a favorable construction effect.This scheme can effectively avoid such disadvantages as high unit explosive consumption and difficult control of exposed blasting technology under vortex flow,deep rapids,and other complex conditions,and it can thus serve as a feasible and effective construction scheme for rapids shoal construction.