Tunnel boring machine efficiently developed by China Railway Construction Heavy Industry comes off the line

DATE:2017-08-13 AUTHOR:Zhang Qiang, Wu Min and Hu Qing SOURCE:original of this website

Full view of 148m long TBM

On August 4, double shield tunnel boring machine (TBM) “Wushi” which is independently developed by China Railway Construction Heavy Industry Co., Ltd. successfully came off the production line in Changsha; it only took five months to design and manufacture the equipment, compared with the general delivery speed of more than 1 year in other countries for the similar equipment, two-thirds of time was saved, breaking the industry practice of long development period for the similar products.

The equipment, with excavation diameter of 6.47m and total length of nearly 150m, is customized for Shenzhen Metro Line 6. Shenzhen Metro Line 6 is located in Baoan District; in the process of construction, the line needed to pass Yangtai Mountain, multiple broken stratums, and the stratums of tunnel surrounding rock are complicated and changeable, there was the condition of special geological change from weak weathering to complete granite without development, with large burial depth, complete surrounding rock and dry compressive strength of more than 100MPa, it was fare in urban metro construction in our country.