Search Results: 'Meyco'

Drilling Rohtang
11 November, 2010
Dywidag International has started excavation at the Rohtang Pass road tunnel in Himachal Pradesh, India. Report by Patrick Reynolds

Shotcrete collapses in Caldecott
05 November, 2010

Advantages of pre-injection grouting
19 October, 2010
The pre-injection method, or injections ahead of the excavation face in underground construction can in many situations offer significant advantages, particularly in difficult ground conditions like water ingress or mechanically poor ground or soil. K. G. Holter and H. O. Hognestad of BASF Meyco look at the use of modern cost-effective methods and material technology for pre-injections in shallow tunnels

Saving the tunnel customer
19 October, 2010
Although passing through tunnels is statistically one of the safest means of transport, major incidents have given the impression of wider potential danger. The aftermath of the Mont Blanc Tunnel fire and tunnel safety surveys have highlighted real areas of concern. Much of the subsequent attention has been on protecting tunnel structure by so-called ‘passive’ means, but humanitarian concerns must be focused on the speed of getting travellers away from the hazardous areas as soon as possible, for the dangers to life work much more quickly than dangers to structure. Maurice Jones reviews some best practice and developments to improve the chances of survival

Clarifying the fog of fibres
19 July, 2010
In response to reported confusion over the roles of fibres in concrete and, in particular, the claims and counter-claims of suppliers of steel and synthetic (polymer) versions, concerning their advantages and disadvantages, Tunnels & Tunnelling International has decided to try to clarify the issues involved for our readers. Maurice Jones reviews the responses to an information gathering questionnaire and other relevant evidence so that readers can, perhaps, make their own judgements

Thin barrier integrity – the easy way?
10 June, 2010
One of the major developments of recent years has been the development of sprayed linings, especially to control potential water make in an operational tunnel and to protect equipment and users from its effects. In this market it competes with many techniques, but chiefly coming up against the use of sheet membrane. So are sprayed membranes making serious inroads into this market and are there any limitations to this deceptively simple idea? Maurice Jones reports on some developments and applications.

Hallandsas first drive approaches end
02 June, 2010
Construction of the Hallandsas railway tunnels in western Sweden has often been described as the most difficult tunnelling project in the world. Many readers would probably want to argue that point but there is no disputing how tricky it has been over the 18 years since construction began. Now, however the Vinci-Skanska contracting joint venture is making steady progress. Maurice Jones reports

Meeting shotcrete specifications
23 March, 2010
In the long history of shotcrete, or sprayed concrete, linings underground, never has so much been expected of them. In the transition in scope from hard rock primary support to soft ground permanent support, shotcrete is now expected to create structures under even more demanding conditions, but still at comparatively low cost. Here technical editor Maurice Jones reviews the state of some developments designed to meet such demands

Feeling the heat
10 February, 2010
Tunnelling through a mountain is tricky at the best of times, but when the conditions are arid and your explosives have to be kept under armed guard, things get a whole lot trickier. Emma Gritt reports