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CP&E
Contractors Plant & Equipment

NOVEMBER 2009 ISSUE  - CP&E - Contractors Plant & Equipment -  the digital publication for construction, mining, quarrying and demolition industries
Nov 2009

 

In Western China, at an altitude of 3,380 m, two parallel railway tunnels 32.6 km long are currently being driven through the Guanjiao mountains.    CHINA                               

Breath-Taking Tunnelling Project

In Western China, at an altitude of 3,380 m, two parallel railway tunnels 32.6 km long are currently being driven through the Guanjiao mountains.

It is the longest tunnelling project that has ever been undertaken in China. Putzmeister technology was commissioned to secure the excavation under extreme conditions using wet-shotcrete.

The spectacular structure is being constructed in a difficult to access mountainous region, and is set to replace the older Guanjiao Tunnel (length 4 km) currently in use and situated 300 m higher.

This higher tunnel is only accessible via very windy access tracks. The perfectly straight route through the mountain situated at a lower altitude will shorten journey times considerably, and fuel savings will be significant - each train requires three diesel locomotives at the front.

The sections of the new Guanjiao Tunnel have been designed for train speeds of up to 160 km/h.


Faster Travel Time to Tibet

From 2000 to 2005, the railway line was extended by 1,142 km from Golmud to Lhasa, capital of the Tibet Autonomous Region (“Tibet Railway”).From 2000 to 2005, the railway line was extended by 1,142 km from Golmud to Lhasa, capital of the Tibet Autonomous Region (“Tibet Railway”).The tunnels form part of the 814 km transport route inaugurated in 1984 to connect Xining, capital of the Qinghai Province, with the city of Golmud situated further west.

From 2000 to 2005, the railway line was extended by 1,142 km from Golmud to Lhasa, capital of the Tibet Autonomous Region (“Tibet Railway”).

The China Railway 16 Bureau Group is commissioned with building over 17.3 km of tunnel, which is a significant proportion of Guanjiao Tunnel Project.

The construction costs for the new Guanjiao Tunnel come to 2.5 billion RBM (approx. € 250 million). The construction time is estimated to be 53 months, and completion is planned for 2012.

Two single-track tunnels, 40 m apart, will be driven up from all four entrances to create an excavated cross section of approx. 90 m². Progress is being made using both tunnel boring machines and drilling and blasting techniques.

As part of tunnelling operations - after excavation and with the calotte strengthened with shotcrete - the side wall and base are built moving a few meters at a time.

As part of tunnelling operations - after excavation and with the calotte strengthened with shotcrete - the side wall and base are built moving a few meters at a time. [cont]


 
 

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