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Tokstrip Sealant Chosen For Walsall Flooding Control System

Posted: Tuesday 11th May 2010

In order to improve storm water retention and flooding alleviation, Severn Trent Water has installed a Gravity Return Storage (GRS) system based on two sites alongside the River Tame at Walsall and centred on the use of Hanson precast concrete box culvert sections. The construction work has been carried out by G.F.Tomlinson & Sons Ltd of Worcester and sub-contractors D.A.B. Civil Engineering and MAY Contractors Ltd.

An essential requirement was the provision of a flexible, watertight seal between all box culvert sections. This was provided by the use of some 5,000 metres of Winn & Coales Tokstrip sealant, which appropriately is now celebrating its 50th anniversary of use in the civil engineering and water industries.

At the James Bridge GRS site in Walsall, G.F.Tomlinson and sub-contractor D.A.B. Civil Engineering installed 3200 tons of Hanson precast concrete culverts to an invert depth of 7meters. Interlocking sheet piles were driven down 9m in an area 70m x 24m. This was then excavated and framed up using a heavy duty shoring system. The box culvert sections, each weighing between 14 to 24 tonnes with cast on end walls, were delivered to site with the joints pre-primed with Tokstrip primer at Hansonís works to help speed up site installation.

Some 3,400 m3 of water capacity is accommodated within the 350 linear metres total length, installed in six lanes. It was built with 210 box culverts 3m wide x 3.6m high x l.5m and 2.0m lengths, and incorporates a dry weather flow channel. 3,300m of Winn & Coales Tokstrip was used here, plus Tokstrip primer.

The Bescot Road GRS site is within one mile of James Bridge. Here, 1600 m3 of water capacity is accommodated. G.F. Tomlinson and MAY Contractors installed 5 lanes of culverts in 40m lengths in a similar depth sheet piled excavation. Again incorporating a dry weather flow channel, 105 Hanson box culverts measuring 3m x 3mx 1.8m and 2.0m were installed with the use of 1700m of Tokstrip jointing compound, plus Tokstrip primer.

` During its 50 years of use Tokstrip has gained an enviable track record within the construction and water industries. Under compression it deforms through the joints to provide a flexible, watertight seal. When used in conjunction with Tokstrip primer, Tokstrip meets the European Standard BS EN 1919 for concrete manholes and inspection chambers. To ensure its lead in the market place, Winn & Coales regularly upgrade the product. Only one grade of Tokstrip is now required for all year round use. It is more user-friendly and easier to handle. The standard Tokstrip primer is now faster drying and a clear primer is available for areas where appearance is important.

Tel: 020 8670 7511.
Fax: 020 8761 2456

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