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  Large Tunnel Sections for Urban Railways. Special challenges in the design and calculation of the formworks

  The lining of some large tunnels in the Hong Kong section of the Guangzhou-Shenzhen-Hong Kong Express Rail Link, has required special formwork, properly designed and calculated for the scope. Particularly for the contract C824, the Italian company CIFA Spa has studied two special formwork systems able to realize all the different sections of the 400m long bifurcation cavern, which are variable both in height and in width. In the same contract, CIFA Spa has also designed the formwork system of the crossover cavern, which includes the huge 21.80m wide crown shutter, calculated to support a concrete thickness up to 1.80m. Due to the large size of the tunnel sections, the lining of these caverns has been carried out in two steps: with a side wall formwork first and with a crown formwork in a second phase.

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