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CREG 9.53m TBM Breaks Through on Tight Radius Curve Tunnel

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The CREG hard rock TBM on Funing pumped storage power station tunnel project has celebrated a successful breakthrough on Oct. 24, 2022. The 9.53-m diameter CREG machine completed a challenging portion of the project that included a tight 90-m radius curved drive.

To overcome construction difficulties, including high compressive strength of rock, high quartz content and small radius curve, CREG customized the large-diameter hard rock TBM for extremely tight radius curve for the Funing pumped storage power station project in Hebei province, China. This TBM is designed with a minimum curve radius of 90 m and a maximum gradient of 9.02%. Moreover, with small radius tunnel belt conveyor and mature support system, this TBM is able to achieve efficient excavation, stable mucking and rapid support.

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Since its launch on Oct. 25, 2021, the TBM excavated a total of 2225.8 m, during which six extremely tight curves with a radius of 100 m and one with a radius of 90 m were completed, achieving a maximum monthly advance of 303 m and a maximum daily advance of 21.7 m.

The total installed capacity of Funing pumped storage power station is 1200 MW. After its completion, it will effectively alleviate the increasingly serious peak-regulation contradiction of power grid in northern area of Hebei Province, save the standard coal consumption of thermal power station in the region, and improve the quality of atmospheric environment.

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