Search Results: 'VMT'

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

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

Leighton Asia milestone on water transfer project
15 February, 2011

Algiers pipejack
11 February, 2011
Belgian contractor Denys is preparing a series of pipejack drives for the latest phase of the sewerage improvement scheme along the bay in Algiers. Report by Patrick Reynolds