Search Results: 'Wirth'

Flexible and forceful
09 June, 2011
Another tunnel excavation method that has been utilising design improvements to successfully push the limits of operational efficiency is the use of roadheaders. Originally developed as relatively soft-ground machines, particularly for sedimentary deposit mining, they are being used increasingly in harder rock excavation. They are also challenging drill-and-blast for places in projects requiring flexibility and suitability for urban tunnelling, especially with regard to vibration and accuracy. Maurice Jones reports

Choices for excavation
09 June, 2011

Strabag buys shield machines for Koralm
20 May, 2011

Powering up at Linthal-Limmern
14 March, 2011
The topography of alpine and similar mountainous areas presents both many challenges and opportunities for tunnelling engineers. Whereas the current focus has naturally been on rail base-tunnels, the business of constructing and expanding hydropower facilities continues apace. Maurice Jones summarises recent developments at the Linthal-Limmern hydropower complex

Lining with security and efficiency
14 February, 2011
Second only to the ‘excitement’ of watching paint dry in frustration stakes, at least in tunnelling, is waiting for concrete to cure. Maurice Jones examines how formwork and concrete mixtures are increasing the efficiency of cast in situ concrete tunnel lining

Progress on Brisbane’s trio of road projects
18 January, 2011
A year and a half away from its scheduled delivery, tunnelling for Brisbane’s Airport Link and related projects is on track—with a little help from revising the alignment, Nicole Robinson finds

Deep down and squeezed tight at Sedrun
06 December, 2010
South African gold mine shafts, German coal seams, World War U-boat construction and Swiss mountain railways all helped on the difficult Sedrun section

The 2010 Harding Lecture (Part 2)
01 December, 2010
British Tunnelling Society, Harding Lecture, 15th April 2010

Finesse in tough environments
10 November, 2010
Technologies employed underground to ensure positional accuracy have advanced at great pace over recent years. The portable computer, data processor and laser have all but replaced the tape, notepad and pencil. These, together with the introduction of lasers as reference axes and the toughening of electronics, have led to major benefits in productivity. Maurice Jones reviews some of the latest developments

Aker Wirth will deliver TBM to Switzerland
12 February, 2010

Schluechtern finish
29 May, 2009

Long run over at DahLong run over at Dahuofang
29 May, 2009

Aker takes over Wirth
20 April, 2009

Alborz service drive breakthrough
12 February, 2009

Limberg II breakthrough
11 June, 2008

Seli completes Passirio bore
11 June, 2008

TBM drive for clean energy from Ashlu Creek
29 April, 2008
Crews are past the first of six major fault zones as 4m diameter TBM excavation moves into high gear on the 2.7-mile long tunnel for the Ashlu Creek run-of-the-river hydro project, in British Columbia, Canada. T&TNA contributor Tonia Jurbin reports

TBMs prepare for Brisbane bypass
10 November, 2007
Activities are hotting up in Brisbane, with the first mammoth TBM for the North South Bypass Tunnel due to launch next month. Michelle Holden, of LBB JV, reports

?NFM?recovery steps ahead
31 August, 2007

Thrill of the drill
08 August, 2007