Search Results: 'VMT'

East meets West
31 December, 2015
Eight Herrenknecht TBMs turned in exemplary performances during tunnel excavation on the Crossrail project. Sally Spencer reports.

Strait Talking
31 December, 2015
When the TBM on Turkey’s Eurasia Tunnel broke through on 22 August there was double cause for celebration.

Breaking boundaries
03 November, 2015
Prior to 2012, the integration of designed vertical or horizontal curves into microtunnel alignments was unheard of in Ontario. Following the release of a large number of infrastructure projects in suburban Toronto, clients and consultants encouraged contractors to present value engineered alternatives to pr oposed project alignments and construction methods. Seamus Tynan and John Grennan of Ward and Burke discuss three recent projects successfully constructing long-distance, curved microtunnels

East meets West
26 June, 2015
This article on guiding and monitoring work on the Avrasya Tunnel project under the Bosphorus Strait was written by Robert Lensing and Manfred Messing of VMT, and Abraham Corriols, Patrick Hartkorn, and Giuseppe Pezone of ITC Engineering.

Gdansk Double
18 November, 2014
Recent slurry TBM bores in Gdansk were the key challenge to build a new road link. Report by Patrick Reynolds.

Shake and bake – Seismic and Geoelectric Prediction
26 March, 2014
Tucked in a corner of Bauma 2013, Geo Exploration Technologies set up their stand to showcase Bore Tunnelling Electrical Ahead Monitoring (Beam). The geoelectric system, developed a decade on from the introduction of geo-seismic predictive technology to the tunnelling industry, has a few key advantages claimed, while Amberg’s offering of Tunnel Seismic Prediction gets a revamp. Alex Conacher reports

Curve Ball
22 January, 2014
Making history, James W. Fowler Co. makes the longest compound curved microtunnel drive in the US to date on the Santa Ana River Interceptor project, John Fowler of JWF reports.

Leaving a legacy
25 September, 2013
April saw the first breakthrough on the two drives for Brisbane's Legacy tunnel, a new western city motorway link for its Transapex network. Adrian Greeman visited the project

Prague metro
04 June, 2013
Ermin Stehlik and Vaclav Soukup of Metrostav return with the most recent chapter, and final part of the article, on prague metro’s history. in this portion, epBms fire into action on running tunnels on the V.a. extension

Hold the line
28 February, 2013
Maurice Jones points out that modern surveying methods now rely heavily on electronic instruments and automatic data collection and analysis through advanced software packages. While these should not detract from understanding of basic principles, the potential for time and staff savings, plus increased understanding of the objects being surveyed, is substantial

Warsaw line two
28 August, 2012
Two of four TBMs have begun drives for the second line of the Warsaw metro system. Technical journalist Adrian Greeman looks at the challenges of cutting under a bomb littered city and the race to complete

Prague Metro’s return to TBMs
28 August, 2012
Ermin Stehlik and David Cyron of Czech contractor Metrostav give this detailed look at the extension to Prague’s Metro Line A and the return to TBM driven tunnels

Morocco’s record microtunnel
05 July, 2012
Morocco’s biggest microtunnelling project in length and diameter is Casablanca’s first as the city prepares to connect a new water treatment plant to its sewer network. Dirk Derycke, division manager tunnelling for Belgian contractor Denys gives this report on works in progress

Tunnel System Number Three drive complete for Sochi
08 March, 2012

Breakthrough at Lai Chi Kok main tunnel
05 January, 2012

Laser guided segment precision
20 October, 2011
T&TI visits the Morgan Sindall precast facility at Ridham Dock in Kent, UK. The plant is currently supplying segments for Thames Water’s Lee Tunnel. Alex Conacher takes the grand tour

Prepared for the long haul
18 October, 2011
Since precast concrete segmental tunnel lining was invented, there has never been so much development of the ‘product’ as in recent years, even though, superficially, it may look the same. Maurice Jones looks at some of these developments aimed at increasing tunnelling progress whilst avoiding mishaps

VMT opens US office
07 October, 2011

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

From the ground up - to project control
14 March, 2011
What happens when underground construction practice doesn’t follow design theory? How can engineers find out what is actually happening with accuracy to reduce risk? The principles of structural monitoring have been known for many years but technical developments in instruments to test ground conditions in situ have increased reliability and reduced cost to such an extent that the wealth of information available has required new thinking in data handling, analysis and presentation. Maurice Jones checks with some leading participants on how data is now collected handled and used, plus how improvements might come about