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Mega slurry TBM for Shenzhen highway link 21 Sep 2017

CREG News Release

A slurry TBM of nearly 16m diameter is in design and fabrication by the Chinese TBM manufacturer CREG for a four lane double deck highway tunnel in the city of Shenzhen in China.

15.8m slurry TBM will excavate four-lane double-decked highway bored tunnel beneath the streets of Shenzhen

The 15.8m diameter machine is being fabricated by CREG for excavation of the 3,583m bored tunnel section of the Chunfeng highway tunnel project under the Jibu River, the city’s Metro Line 9 and adjacent to other urban buildings and public infrastructure.

The TBM manufacture and supply contract, awarded to CREG on 29 August, is for delivery of a slurry TBM system capable of operating under a working pressure of 8 bar and on a project on which settlement control will be a great challenge.

Cutterhead of another TBM  of more than 15m in diameter in fabrication
Cutterhead of another TBM of more than 15m in diameter in fabrication

The Chunfeng highway tunnel project is one of the most important municipal projects for the purpose of easing the traffic congestion in Shenzhen megalopolis and the 3,583m bored tunnel section of the more than 5,000m long underground highway project will test the highest parameters of slurry TBM operations. As well as working under a maximum pressure of 8 bar, the technical specifications of the 15.8m diameter TBM include:

  • A drive power of 6,300kW (350kWx18)
  • A nominal torque of 5,1130kNm
  • A maximum torque of 6,9027kNm
  • A cutterhead rotation speed of 0 to 2.25 rev/min
  • A thrust force of 2,4630 tonne and
  • A maximum advance speed of 50mm/min

As the 15.8m diameter machine is ready for fabrication another slurry machine of 15.03m diameter is said to be in final assembly in the CREG main factory in Zhengzhou.

On Thursday evening in London (21 September 2017), CREG will be part of the British Tunnelling Society meeting with China Railway Tunnelling Group in presenting a lecture about highspeed railway tunnelling projects and the status of tunnelling in general in China.

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