By Lynda Myer
With 130m length,14.33m diameter and weighs 3,800 tons, Pingshandong No. 2 is the slurry TBM that CRCHI has manufactured for advancing the Shenzhen-Shenshan railway project.
The location of deploying this machine will be the SSSG-3 section of the Shenzhen-Shenshan Cooperation Zone Railway Station Project.
Running parallel with the Xiamen-Shenzhen high-speed railway and passing beneath a river and residential neighborhoods, this tunnel is 4.6km-long shield section and a single bore with a maximum longitudinal slope of 28%.
The geology of the alignment comprises argillaceous sandstone, limestone, glutenite and granite strata, including 240m of karst development, 1,200m of granite strata and three faults.
Considering that the TBM is equipped with a composite cutterhead, telescopic main drive, double crushing system, high-efficiency material transport system, as well as box culvert fine-tuning device, it could overcome the challenges of the geology and long-distance tunneling.
The cutterhead is painted with images of mountains, rivers and seven high-speed railways trains.
