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Geotechnical details Monday 22 May

9.45 Theatre B Unique structural repair solutions. Vic Handley, Van Elle.

An overview of techniques developed for the structural repair and underpinning industry. These include the Hoopsafe system which stabilises structures using post-tension ring beams to induce compressive forces into the masonry structure. The BrickBeam is a way of strengthening existing masonry by inducing compression directly into the structure. It involves diamond coring and post-tensioning and is particularly appropriate for strengthening walls at corners and at bay windows. Van Elle has also developed specialised piling equipment systems for underpinning and structural repair work.

10.45 Theatre B Basal reinforced platform design, turning advanced theory into economic practice.

Philip Staten, Maccaferri.

The technique of providing a basal reinforced platform (BRP) to transfer embankment loading into underlying piles has been used for several years. Recently advanced numerical analysis has enabled a detailed comparison to be made between conventional arching theories and BS8006. This work has lead to the development of the 'Maccaferri Strip' design, where strong polymer reinforcement is used in strips directly over pile caps and the remaining area is reinforced with a low strength woven geotextile. The strip system not only offers a safe technical answer to a complex problem but provides cost savings.

11.45 Theatre B Wasted opportunities - how not to specify a geotextile.

David Shercliff, Geofabrics.

Engineers need to design their geosynthetics with a clear understanding of function.

All too often geosynthetics are specified by a long list of measured properties from a manufacturer's data sheet. This can lead to complications and impossibilities when it comes to estimating, buying and laying these materials. They should be specified and monitored as carefully as concrete or steel in a ground structure.

12.45 Theatre B Rapid ex-situ bioremediation. Alistair Kean, Bio-Logic Remediation.

Ex-situ bioremediation has an increasingly important role in on-site treatment of hydrocarbon contamination. Bio-Logic Remediation has developed a unique method which it will present with a number of case studies. The process was devised to provide a viable, cheaper alternative to the landfill approach to contaminated soil remediation.

13.15 Theatre A Large structure box jacking technology. Dr Douglas Allenby, John Ropkins/Edmund Nuttall.

Technology for jacking exceptionally large bridges and culverts into place, particularly beneath existing transport infrastructure, has been developed by Nuttall and consultant Ropkins. Examples include recent work on the Lewisham extension of London's Docklands Light Railway and Dorney Bridge at Maidenhead where an 8,000t twin culvert - 50m long, 25m wide and 10m high - was jacked under the Great Western Railway main line for Railtrack and the Environment Agency.

14.45 Theatre B The moving of the Belle Tout Lighthouse at Beachy Head. Tim Jolley and John Robbins, Abbey Pynford.

An explanation of the techniques used for introducing a grillage of stiff reinforced concrete beams into the load bearing walls of a structure. Examples of a high level beam being constructed illustrate the methodology. The talk will develop to include jacking techniques used to keep a building level while raising it prior to moving.

15.15 Theatre A Contracts for the future - which way? Martin Hirst, Civil Engineering Contractors Association with Masons solicitors.

An ongoing and fundamental change is taking place in the procurement methods used for construction. This impacts on all those in the procurement chain, not least the contracting side of the industry. The Civil Engineering Contractors Association seeks to examine these changes and generate a debate on the correct contractual approach, and the conditions of contract and contracting strategies that should be used.

16.45 Theatre B Environmental mapping on the engineer's desktop. Christopher Roper, Landmark Information Group Landmark Information Group and Prodat Systems, founded separately in 1995, set out to exploit opportunities opened by the large-scale Ordnance Survey digital map of Britain. Landmark built a database of environmental risk information to produce site specific reports, EnviroCheck. Prodat developed a CD-based, pay-on-use delivery system for large-scale OS mapping (Promap). When the Daily Mail Group acquired both companies it encouraged them to combine their respective strengths. A just-launched CD-based system gives engineers desktop access to environmental data mapped on to OS digital mapping.

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