three-arm drilling jumbo

The three⁃arm drilling jumbo is specialized equipment for hard rock tunnel construction using the drill⁃and⁃blast method. Its boom system is crucial for the extensive operational range of the end drill. Addressing the issues of easy vibration and large deformation in the boom system of the

Based on the construction conditions and engineering characteristics of the Wujialiang super-long tunnel of Chengkai Expressway, this paper studies the mechanized excavation application of three-arm rock drilling rigs in high-risk long tunnels, and compares the cost of manual excavation

A fully-computerized drilling jumbo is used for drilling excavation in view of the characteristics of Luojiashan Tunnel in Lot 7 of Zhengzhou-Wanzhou High-speed Railway，for the purpose of meeting the requirements of“mechanization，industrialization，specialization and informatization”in tunnel