The world's largest earth pressure balance (EPB) double shield hybrid tunnel boring machine, or TBM, rolled off the production line in Changsha on March 26. The TBM is called "Qiangji," which means "Strong Foundation". It was jointly developed by Zhejiang's Hangzhou Water Group, the China Railway Construction Heavy Industry Corporation, and the China Railway 18th Bureau Group Corporation. With a diameter of 12.68 meters and a total weight of 3,500 tonnes, the TBM will be used in the construction of a drainage tunnel in Hangzhou, Zhejiang Province. (Photo/Gu Pengbo, Tong Di, and Xie Zhuofang, Hunan Daily)

The world's largest earth pressure balance (EPB) double shield hybrid tunnel boring machine, or TBM, rolled off the production line in Changsha on March 26. The TBM is called "Qiangji," which means "Strong Foundation". It was jointly developed by Zhejiang's Hangzhou Water Group, the China Railway Construction Heavy Industry Corporation, and the China Railway 18th Bureau Group Corporation. With a diameter of 12.68 meters and a total weight of 3,500 tonnes, the TBM will be used in the construction of a drainage tunnel in Hangzhou, Zhejiang Province. (Photo/Gu Pengbo, Tong Di, and Xie Zhuofang, Hunan Daily)

On March 26, technicians debug the "Qingji" TBM at the second industrial park of the China Railway Construction Heavy Industry Corporation in Changsha. (Photo/Gu Pengbo and Tong Di, Hunan Daily)

This article is from the Hunan Provincial Government www.enghunan.gov.cn.

Translator: Xiao Juan

Chinese sources: hunan.gov.cn; Hunan Daily