China's self-developed hard rock boring machine "Caiyun" in Kunming offline

“The “Caiyun” hard rock boring machine excavation cutter head diameter of 9.03 meters, is China's largest self-developed domestic diameter hard rock boring machine, to fill the gap of the domestic 9 meters large diameter hard rock tunneling machine.” China Railway Equipment Group He Fei, the deputy director of the Design and Research Institute, said that “Caiyun” has made many innovations in strengthening the auxiliary construction methods, such as the steel bar support system and the front-end spray mixing manipulator system to deal with the surrounding rock deformation and fault crushing zone. Risks that may be encountered during excavation such as rock bursts, mud outbursts, and high geothermal heat.

According to the China Railway Tunnel Group, "Caiyun" will be applied to the Gaoligongshan Tunnel from the Dali-Ruili Railway in Yunnan. Geological tectonic movement is active and geological conditions are complex in southwest Yunnan, especially in Gaoligong Mountain. The ordinary drilling and blasting method is difficult to construct. It is the first time that a large-diameter open tunnel hard rock roadheader is used for construction work.

It is understood that the Darui Railway is located in the western part of Yunnan Province and has a total length of 330 kilometers. It is part of the Sino-Myanmar international railway corridor of the Trans-Asian Railway (West Line). The length of the Gaoligongshan Tunnel is about 34.538 kilometers, which is the key control of the Darui Railway. Sex works. The tunnel has a maximum depth of 1,155 meters and an average depth of 800 meters. The inlet section passes through 18 lithologies and 12 faults. The exit passes through 8 lithologies and 7 faults, and the geological conditions are complex and changeable.

""Caiyun" has enhanced the function of auxiliary construction method while meeting the need for rapid rock-breaking. It can better adapt to bad geology. The "Caiyun" hard rock tunneling machine can achieve more than 400 meters per month in Gaoligongshan tunnel." He Fei Say. (Ding Yiquan)