China Railway Engineering Equipment Group Co

3-Boom Drill Jumbo

Introduction： CTJ3A is a hydraulic 3-boom Drill Jumbo independently designed and manufactured by CREG whose coverage reaches up to 170 m2. The maximum height of borehole is 12.50 m. Diameters of drill range from 43 mm to 102 mm. The maximum speed is 17.50km/h and the maximum climbing capacity is 18°.

Project Facts

Product Facts

The tunnel is part of Yakang Expressway. The tunnel mainly comprises of rock mass class III and class IV and alternate granite and mudstone. The UCS averages 40 MPa. CTJ3A adapts quite well to the ground. Its monthly advance exceeds 250 m and each round could produce more than 150 boreholes. It takes only 3 to 3.5 h to drill a hole. The pure drilling efficiency sustains between 1.7 m to 2.5 m/min. The overcut and undercut of boreholes are kept within 10 cm. The machine is quite steady in both function and tunnelling speed.

Machine Specification

To be added.

Geological Features

To be added.