Search Results: 'London Underground'

Repair, refurbish or replace?
12 December, 2000
Many tunnels built in the 19th century are still in service, but changes of use, loadings and the gradual deterioration of the structures by modern pollutants has meant that these tunnels require on-going maintenance or complete refurbishment to extend their usefulness. Gareth Mainwaring, principal engineer with Mott MacDonald's underground works and geotechnical team explains

London line up
12 December, 2000

Under new management
12 December, 2000
The final choice is being made this month on the consortia taking over responsibility for the now to be privatised tunnel and infrastructure assets of the world's oldest and most complex metro – the London Underground. Mike Winney reports on the tunnel work that might be required.

Lighting and linings
15 October, 2000
The technical challenges facing civil engineers when constructing a new tunnel are well documented, but there are often many problems to overcome for those installing the finishes and lighting too.

Worldwide demand for underground ventilation
01 September, 2000
Peter Hunnaball, business development manager of Woods Air Movement, outlines current sectors of demand for underground ventilation fans across the world.

Work takes off at Changi
01 August, 2000
Singapore's multiplicity of tunnels for new mass transit lines has been reported in general(T&TI April), and the BTS has heard presentations (T&TI March). Recently Adrian Greeman visited one particularly difficult site, at the international airport.

Underground movement
01 August, 2000
The Health and Safety Executive report on Heathrow tunnels' collapse is analysed by John Anderson, who was with HSE from 1970 to 1997. He is now a consultant civil engineer

Determination to overcome difficulties
01 August, 2000
No stranger to meeting difficulties the tunnelling industry was presented with plenty during the past year.

Snapshots of Scotland
01 July, 2000
Scotland's tunnels were the theme of a British Tunnelling Society informal dicussion on 13 April with a four part presentation. Chairman was David Donaldson.

JLE and the lessons from Heathrow
11 June, 2000
At the March meeting of the British Tunnelling Association, construction and redesigns of the Jubilee Line Extension (JLE) stations at London Bridge were described Taylor Woodrow's John Wallis and David Sharrocks, and at Waterloo and Westminster by Peter South of AMEC and Steve Parker of Balfour Beatty. Valuable lessons had been learnt from the Heathrow collapse.

Trenchless: a technology for the 21st century
01 June, 2000
John Castle, executive secretary of the International Society for Trenchless Technology, outlines the progress made in the trenchless field since the technology consolidated into a new discipline 20 years ago.

Quantifying the science of tunnelling
30 March, 2000
Tunnelling has been described as an art and a science. The 'art' was based on experience, usually gained by trial and error. In modern tunnelling there is much less tolerance of error. This increases the need for accurate data as a basis for design and construction decisions, on which the science of tunnelling is built. In this article, Technical Journalist Maurice Jones examines the types of instrumentation & monitoring equipment used in tunnel construction.

Singapore - past, present and future
30 March, 2000
Presentations on the large amount of tunnelling work undertaken in Singapore were given by Alan Finch, Mott MacDonald, UK, and Terry Hulme, consultant to the Land Transport Authority, Singapore, at the British Tunnelling Society in November 1999.

A partnership with our readers
25 March, 2000

Monitoring settlement in London Clay
25 January, 2000
One of the major considerations when tunnelling in cities is the influence that underground works have on overlying structures. To further understanding of mechanisms involved in the development of settlement troughs, Brown & Root in the UK has embarked upon an internally funded project. A monitoring site was established along the line of an advancing tunnel to investigate the relationship between tunnel construction and the response of the surrounding ground.