Original Title: Industry Viewpoint | From “Conventional” to “Unconventional” Construction Method, What Are the Developments and Innovations of Drilling and and blasting method In today’s infrastructure construction, TBM or other mechanical tunneling technology has become the mainstream, only in the mining industry, the drilling and blasting method is still the most common excavation method. However, the drilling and blasting mnels and caverns, connecting passages, shafts, etc. Unlike the usual circular section of TBM, the construction section of the drilling and blasting method is more free,Mining Drilling Equipment, and the space waste of the construction tunnel is less. The strata in Europe are mostly composed of hard granite and gneiss, and the drilli after the tunnel is excavated by drilling and blasting, and no other cast-in-place concrete lining is used; Norway has more than a thousand road tunnels (the largest number in the world) and hundreds of small hydropoe of rock mass constructed by drilling and blasting method reached 4,dth drill bits,200,000 m ³; Although mountain tunnels in the Alps are generally longer,M method. Innovation of drilling technology After years of development, rock drilling tools have developed from the original hand-held drill or single-boom jumbo to today’s fully automatic multi-boom rock drilling jumbo: its excat The advanced drilling jumbo can be switched freely between fully automatic and semi-automatic modes: In the full-automatic mode, after the excavation of a borehole is completed,dth rock bit, the drill bit automatically moves to the next position and staf TBM tunnel excavation will lead to a long time of shutdown, while in the drilling and blasting construction of multi-operation,mining dth bit, even if there is a problem at a certain point, the overall tunnel construction can still continue. As long as the drilling and blasting method is used correctly, it is still a feasible option even in the construction of long-distance tunnels. Editor: Guo Deyuan ☞ Wechat and magazine submission email: Return to Sohu magazine@tunneling.cn to see more Responsible Editor:. wt-dthtools.com
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