tunnel excavation

This paper mainly studies the application of three-arm rock drilling trolley in tunnel excavation. Firstly, the basic structure and working principle of the three-arm drilling rig are described. Secondly, its role and advantages in tunnel excavation construction are discussed. Finally, combined

In order to apply mechanized drilling and blasting method for large-section tunnel construction in weak surrounding rocks， construction technologies of rock drilling and arch installation were studied based on Laifu tunnel of Chongqing-Kunming high speed railway. Through the renovation of the

The paper covers developments of air rock drillers and rock-drilling jumbos in China and summarizes individual usage features and limits of rock drillers, rock -drilling jumbos and shield machines during the tunnel constructions, analyzing domestic market shares and developmental trend of