Rapid Excavation and Support Construction Technology for Steep Inclined Shafts in Hydropower Engineering
At present,in China,inclined shaft excavation is generally carried out using BMC400 reverse drilling rig to form a guide shaft,followed by manual pneumatic drilling for blasting and excavation,manual slag removal,and inclined shaft support using manual pneumatic drilling for drilling and installing anchor rods.The conventional construction plan has problems such as slow construction speed,low construction efficiency,high safety risks,and limited support depth.TB hydropower station adopts the construction method of one-time completion of large-diameter slag inclined shaft,unmanned driving technology for excavator going down the shaft,unmanned driving technology for high arm drilling rig going down the shaft,and optimized the layout of inclined shaft lifting system.It ensures the stability of the surrounding rock of the large section steep inclined shaft,forms a virtuous cycle of excavation and support operations,and effectively improves the excavation,support quality,and construction efficiency of the inclined shaft.
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