Tunnel drilling rigs can be categorized by the number of drilling arms: single-arm, double-arm, triple-arm, and quadruple-arm. Epiroc's tunneling drilling rigs can be equipped with up to four drilling arms. CRCC Heavy Industry has developed China's first domestically produced quadruple-arm drilling rig and the world's first fully electric, high-altitude, fully computerized triple-arm drilling rig.
Based on their movement method, they can be classified as tracked or rail-mounted. By control method, they can be categorized as standard, remote-controlled, and fully computerized (intelligent). By power source, they can be categorized as diesel-powered or pure electric. Based on functional integration, they can be categorized as standard drilling rigs and drill-blast-support integrated rigs.