Meeting the challenges of the Thorndell Viaduct replacement, Rochester

14 September, 2017 | 18:00 - 20:00

Venue address:

Huguenot Museum
95 High Street
United Kingdom
Construction of the Thorndell Viaduct
Construction of the Thorndell Viaduct

About this event

Thorndell Viaduct was a £5.5 million design and construct project for the replacement of the existing 58m six span iron railway viaduct with a new reinforced concrete structure during a single possession. The rail viaduct forms part of the main route from the south coast via Horsham and Gatwick to London termini and is situated on a flood plain.

The new structure removes a 'heavy vehicles restriction' and provides a 120-year design life with a minimal future maintenance requirement. This was a technically challenging project requiring close co-operation between the teams of the client Network Rail, BAM Nuttall, Cass Hayward design team and the specialist contractors, to apply a number of innovative techniques to minimise environmental impact and promote buildability.

Access to the site required a 1km access road which was constructed using a soil stabilisation technique to substantially reduce the impact on the area. The foundation for the structure consists of 25-metre piles which support a reinforced concrete raft with piers and abutments. The new deck was constructed offline and comprises 80 individual precast elements, which were cast on site. The deck was installed in 76 hours including the removal of the existing structure with the new 1,476 tonne deck moved into position using self-propelled modular transport.

Following completion of the structure the area was reinstated to provide an improved habitat for water voles. The project team achieved an excellent safety record with no reportable accidents throughout the contract period.

Our speakers are Sven Heuten, Site Agent BAM Nuttall, Gareth Davies, Designer Cass Hayward and David Edwards, formerly employed by BAM Nuttall (Design Manager).

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