This article reports on three revolutionary developments in tunnel boring machine (TBM) technology, that have been used at the Klippen Hydro Power Project in Sweden. These developments are: (1) a back-up system, able to store 114 cu m of waste before loading it into wagons in less than two minutes; (2) a locomotive able to haul this volume of waste safely up a 25% incline at 10kph; (3) a new TBM bearing layout, combined with 510mm water-cooled disk cutters able to withstand an average thrust of up to 35t per cutter. The tunnelling work is being done by the largest TBM in Sweden. When the Klippen Project was approved, the technology needed to implement it was still in very early stages of development. The clients, contractors and equipment suppliers have made exceptional efforts to complete the project within a tight and rigorous schedule. Engineering works include an underground power station, 7.5km downstream of the inlet portal, and an 11km 6.5m diameter tunnel, which is being constructed by an Atlas Copco Jarva Mk27 TBM. The estimated completion date is in 1994. The TBM approach was chosen in preference to drill+blast, because the latter method would have required excavation from six fronts to ensure completion of the project on time. Another advantage of using a TBM drive is its smoother tunnel profile.

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  • Corporate Authors:

    Morgan-Grampian (Construction Press) Limited

    Morgan-Grampian House, 30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • DARLING, P
  • Publication Date: 1993


  • English

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Filing Info

  • Accession Number: 00662446
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 28 1994 12:00AM