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  Date 2004
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The GBR in underground construction
01 November, 2004
This years joint September meeting of the British Tunnelling Society and the British Geotechnical Association was presented by Randall J Essex, executive vice president and director of tunnelling at Hatch Mott MacDonald, US. The presentation introduced the US experience in the use of a Geotechnical Baseline Report (GBR) as a prime contract document for underground works

Sedrun - Gotthard's toughest challenge
01 November, 2004
Planning to drive sections of the world's long-est tunnel from its centre point, 2500m underground in variable, squeezing ground, was indeed a challenge. However, using a combi-nation of mining and civil tunnelling methods, it is a challenge that many manufacturers have been lining up to meet with innovative equipment, reports Maurice Jones

Providing for dispute resolution
01 November, 2004
Paul Cullinan, director of construction contract and disputes firm, Aster Consultants Ltd, in association with Friary Chambers, Dublin, provides an overview of dispute resolution on international construction projects

Who's your champion?
01 November, 2004

Designing Sydney's Lane Cove Tunnel
01 November, 2004
The 3.6km long twin-tube Lane Cove Tunnel in Sydney, New South Wales is scheduled to open in 2007. Here, Jim Rozek, project design director for Parsons Brinckerhoff, describes the current status of the project and details how the local geology has affected the tunnel design

Upgrading a legacy - the Frejus rail tunnel
01 November, 2004
In order to facilitate the increase in trans-Alpine freight, the historic Frejus rail tunnel is currently being upgraded to accommodate larger rolling stock. Piergiorgio Grasso, Moreno Pescara, Federico Valdemarin and Darren Page from Geodata SpA, Italy, describe the geotechnical, structural and tunnelling works currently being carried out to achieve this

Egnatia's tunnels feel the squeeze
01 November, 2004
With infrastructure development for the Athens Olympics finished, new attention is being paid to the major motorway under construction in northern Greece and its 77 tunnels. Report and photographs by technical journalist, Adrian Greeman

A targeted approach to segment design
01 October, 2004
Nick Blayney, special projects director for Romtech Ltd, discusses the use of steel rebar reinforcement in pre-cast concrete tunnel segments and addresses the added benefits of its ability to target reinforcement where it is most effective

London's segmental lining development
01 October, 2004
Tunnel engineering technology evolves and improves with every project. Several projects in the UK that illustrate some recent developments in segmental tunnel lining technology include Section 2 of the Channel Tunnel Rail Link (CTRL), and Crossrail's Moorhouse Shaft, in London. Technical journalist, Chris Webb, discusses some of London's modern and traditional segmental lining methods

Terrorism - the new challenge for old tools
01 October, 2004
Specialist tunnelling lawyer, Professor of Engineering and Australian delegate to the ITA Security Group, Prof. Arnold Dix reviews the possible impact of terrorism on underground infrastructure and urges a rational approach to dealing with this modern day low risk/high impact danger

Farewell
01 October, 2004
Sir Alastair Morton 1938 - 2004

Geotechnical risks in rock mass characterisation – Part 2
01 October, 2004
The geotechnical risk in rock mass characterisation and tunnel design as well as classification procedures of the proposed concept for rock mass characterisation were discussed in Part 1 of this paper (T&TI, September 2004, p37). Here in the conclusion, Irmina Pöschl and Johannes Kleberger of iC Consulenten ZT GmbH, present the application of the concept in two case histories that are both subject to different boundary conditions

Caracas Metro begins production
01 October, 2004
last month, the turnkey segment manufacturing plant for Caracas Metro's Line 3, in Venezuela, successfully started production.

A helping hand
01 October, 2004

Precision measuring for segment moulds
01 October, 2004
The precision required for the manufacture of moulds used for the casting of tunnel lining segments is frequently not stated; the tender documents for a typical segmentally lined tunnel project only giving the dimensional tolerances for the finished segments. In some cases however, only the tolerances for a sample build of two test rings is given.

Worldwide deliveries
01 October, 2004
CBE-Tunnels has 25 years of experience in the design and manufacture of steel moulds and industrial equipment for the production of precast segments. CBE has supplied numerous clients, with more than 7500 segment moulds and 180 manufacturing plants to date.

Taiwan's high-speed rail link cruises home
01 October, 2004
As construction of the 48km of tunnels on Taiwan's High Speed Rail Line concludes, Bradford Townsend, deputy chief director engineering/ESC for Taiwan High Speed Rail Corporation (THSRC), explains the reasons for the massive BOT scheme's considerable success

An end to leaking joints
01 October, 2004
Modern Gasketed tunnel and shaft linings are remarkably watertight, however, leaks do occur. This is usually caused by damaged gaskets or hair line cracks. Injection into the joints or cracks with polyurethane resin provides a ready solution, which has proved to be cost effective and extremely durable.

Smoothbore shafts for UK projects
01 October, 2004
Charcon Tunnels, a division of Tarmac Precast Concrete, manufacture an extensive range of standard segmental concrete shaft and tunnel linings of varying designs and diameters, to meet the requirements of most shaft and tunnel projects. Charcon also design and manufacture bespoke linings to suit the particular requirements of a customer if the standard options are not suitable.

Bespoke handling
01 October, 2004
Specialist Plant Associates produce a wide variety of bespoke segment handling equipment to suit customer requirements. Recent contracts in this field include provision of surface segment handling equipment to CTRL's C220, consisting of hydraulic tippers, feeder systems and lifting frames to suit its 7.15m internal diameter fibre-reinforced precast concrete lining.