________________ In China, new metro networks are being planned on a large scale and then built without delay. No less than 76 tunnel boring machines by Herrenknecht are excavating their way through the underground of the fast-growing metropolis of Guangzhou. The soil formations encountered are manifold: varying degrees of weathering and rock strengths, quicksand and granite as well as underground water deposits. The Herrenknecht TBMs are coping with these conditions very well. Some of them are involved in driving several lots. The S-241, for example, has completed seven missions. Machines adapted to specific projects are equipped with a wear-resistant cutting wheel, among other features. Potential uses of classical Earth Pressure Balance Shields are being enhanced by injection systems for soil conditioning or overcut drilling, facilitating safe and precise excavation of tunnel tubes also in mixed soil conditions. The working processes of mechanized tunnelling and additional tools (e. g. forward planning of ring segment sequences for the installation of segments) support jobsite teams in building metro tunnels of optimum quality.
76 Herrenknecht TBMs are excavating more than 230km of tunnel: The machines are reused several times; some main drives have been working perfectly on more than 18km.
The jobsite teams achieved best tunnelling performances of up to 48m per day and 691m in a month.
As Herrenknecht has its own facilities in Guangzhou, delivery times can be met reliably, even in cases where the schedule is tight – like for the 2010 Asian Games.
Tunnel length: over 230km (in total)
Geology: varying layers/degrees of weathering of granite, sandstone, claystone, siltstone limestone, clay, sand, gravel, marl
Contractors: Contractors are numerous Chinese constructions companies.
68× EPB Shield, 8× Mixshield
Cutterhead power: 630kW, 945kW, 1,200kW
Global Tunnelling Experts
4 members of staff / 2 job profiles
Since 1997, Guangzhou has been building its metro network at high speed. In the year 2012, a total of eight lines with 144 stations were in operation – reaching as far as the airport and the neighboring city of Foshan. A total of 666 km, 330 stations, and 16 lines are to be completed by 2020.
Herrenknecht in Asia: always close to the customer
Herrenknecht provides a wide spectrum of solutions in China. Sales, service, manufacturing and assembly capacities allow for a direct support of projects and short delivery times in the Asian Pacific region. Guangzhou is the biggest location in China. Here, the tunnel boring machines are assembled, commissioned, or rebuilt, while excavation tools are manufactured and sold. With around 900 members of staff in China at nine locations, we offer an all-around service – quick, reliable, and on time.
The endless city:
The Pearl River Delta is developing into the largest conurbation in the world. The companies Herrenknecht (Guangzhou) Tunnelling Equipment Co., Ltd. (1) and Guangzhou Herrenknecht Tunnelling Machinery Co., Ltd. (2) are delivering the tunnelling technology needed for the construction of the Delta’s underground infrastructure. Together with the other Herrenknecht locations in China and Asia, we create comprehensive equipment and service packages according to our customers’ requirements.