Search Results: 'Wirth'

Marine shaft construction with outfall tunnel connection
29 December, 2022
The Musaimeer outfall project in Qatar had many interesting technical aspects and construction challenges. In this feature, the second feature of the project by Gary Peach, and along with Khalid Saif Al-Khayareen, the works needed to build an offshore shaft that would be intercepted by a TBM, then to be buried, are discussed.

TBM challenges on a demanding sea outfall
14 April, 2022
Gary Peach, project manager and consultant with Mott MacDonald (Doha, Qatar) discusses the challenges and management deployed to overcome and successfully complete what has been hailed as the Middle East’s longest storm and groundwater tunnel

RETC RAISES THE CONFERENCE BANNER
30 April, 2021
Following the interruption to the tunnel conference scene caused by the pandemic, the RETC Conference is back and – Covid allowing – looks set to take place in Las Vegas on 13-16 June 2021

The new network
14 August, 2019
Alex Conacher travelled to Changsha, China, to meet with a number of Chinese manufacturers as, spurred on by an enormous China-led investment programme, they take a more international approach to their businesses

International Iberia
10 April, 2019
Paola De Pascali interviews Spanish infrastructure companies and the Spanish Association of Tunnels and Underground Works to understand how the financial crisis affected the tunnelling industry and how the companies became active abroad, getting a strong presence on the international tunnelling market.

Metropolitana Di Napoli
21 September, 2018
Paola De Pascali talked to Giuseppe Molisso, Ansaldo’s project director, about challenges met during construction of Naples Metro Line 6, situated in a dense historical and artistic environment

The Koralm connection
22 January, 2016
Austria’s Koralm tunnel is part of a new alpine link in Europe. Keren Fallwell reports

The move to mechanisation
23 September, 2015
It is in base tunnels that the TB M can really come into its own. Adrian Greeman reports

Growing underground
11 December, 2013
Ever more efficient mine development infrastructure, and geotechnical planning, are key to expanding production at major mines. Report by Patrick Reynolds

Inroads below
04 December, 2013
TBMs, hybrids, and pipejacking technology are finding greater applications and opportunities in mining, reports Patrick Reynolds

Which ever way you slice it
27 December, 2012
It is easy to get ‘tunnel vision’ in examining the possible methods of excavation. If engineers were happy with that then disc and roller cutters for hard-rock TBMs would never have been developed as an alternative to drill and blast. Maurice Jones asks what has been tried before and what might still be valid

On the cutting edge
27 December, 2012
The process of mechanical excavation through dry ground, whether hard or soft, is pretty well understood. For ‘mixed’ ground, of whatever form, it is a different matter, especially if it is deep under groundwater. Maurice Jones reports that there is a consequent rush of TBM cutter development activities to gain the best competitive, and cutting, edge

Finishing India’s longest
18 June, 2012
Following tunnel excavation breakthrough last September, and the final blast in April this year, work is continuing on the long and notoriously difficult Panjal railway tunnel in India to complete support lining including some necessary ground reinforcement work. Maurice Jones reports on the latest progress

Choices for excavation–part 2
15 June, 2011
In this second and final part of our review of the extended capabilities of modern tunnel excavation methods, we examine the leading role of tunnel boring machines. Maurice Jones contacted some leading TBM manufacturers for their views and developments to expand the envelope of capabilities

Number four goes forth
15 June, 2011
Bhaskar Thapa of Jacobs Associates and Axel Nitschke of Gall Zeidler Consultants report on progress at the Caldecott fourth bore project

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

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