Technology > Tunnel boring
Tunnel BoringTbm2
The first TBM project executed in Norway dates back to 1967. It was called promising, in spite of low penetration and high costs. Later TBM development is closely connected to the development of high performance machines, increased thrust per cutter and improved bit technology. James S. Robbins and Robbins machines played an important role in this process. It should also be mentioned that the first attempt to construct a TBM in Norway was made in 1922 by Mr. I. B°hn. He held a patent since 1917 and brought his machine as far as to the testing stage.


The underground has been utilised during centuries also in this country. Systematic mining of ores and minerals in Norway dates back to the sixteenth century. Being a mountainous region, tunnelling was in second hand closely linked to the development of communications. Our tunnelling for railroads started in the latter part of the 19th century. Thanks to the topography, precipitation and water storing possibilities, and the need for energy, hydropower development has been an important construction segment from 1945 up to say 1990. A major part of our TBM-operations were linked to this development from 1965 onwards. Additional tunnelling for water supply and sewage handling has also been of importance during the same period, whereas road tunnels always used to play a less important part of the TBM market.

Due to a combination of rock quality, well developed drilling equipment, qualified tunnellers and well trained designers, Norway used to be a typical źdrill and blast╗-country. A competitive market situation, however, is the golden key to new cost efficient methods. Thus hard rock tunnel boring was introduced and during the years, through close co-operation between suppliers and contractors, the method was honed to perfection.

   


Summary from the TBM conference Bergen June 2010Ruth Gunlaug
Ruth G.Haug, previous president of NFF and now active member of the International Committee, presented a summery of observations and comments at the end of the conference.

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Tunnel Boring versus Drill & BlastArnulf M.Hansen
This is an ongoing discussion. In general, one must not expect one single answer. It depends on the circumstances, the project in general, the location, the timing, the quality demands and more.

What can be listed are aspects favouring either the Tunnel Boring method or the Drill & Blast Method.

One of the leading Norwegian TBM expert consultant companies Messrs. AMH Consult AS has prepared an analysis we would like to share with you. It should be mentioned that the document was discussed in the i ITA WG No.14 (Mechanized Tunnelling) in Agra, September 2008. Further discussions may take place during the upcoming ITA Work Group deliberations in Budapest May 2009.

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The Split Ringsplit_ring1
The SPLIT-RING cutter has a cutterring that is cut in two halves before it is mounted. Thereby only the cutterring is exchanged with the cutter itself remaining on the TBM head. The cuttering exchange is done in 5-10 minutes with one man.

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IBA Fullproffullprof
The Windows software IBA FULLPROF is a tool for estimating time consumption and costs for hard rock tunnel boring.IBA FULLPROF provides the opportunity to easy and fast estimate one or more alternatives with the selected level of accuracy.

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