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Johnston Pipes wins contract to supply glass reinforced plastic jacking pipes for renovation of the Dundee sewer system.

CONTRACTS

Johnston Pipes has won a £0. 5M contract to supply glass reinforced plastic jacking pipes for the North of Scotland Water Authority's renovation of the Dundee sewer system.

The Telford-based company is supplying 2100mm diameter 500T capacity pipes for a 938m long tunnel. The pipes will be installed through difficult geology, under buildings and the East Coast Main Line railway.

The main contractor for the work is Johnston Construction, which will fit the pipe with its Herrenkenecht AVN tunnelling machine, slightly modified to jack the 2100mm pipe.

'Because the outside diameter of the pipes is smaller, less excavation work is required so significant savings are to be made in time and disposal costs, ' said Ian Stanley of Johnston Construction's microtunnelling division.

'This is especially important here as there is some contamination from an old gasworks. '

Stanley said longer drives were possible because the pipe is supplied in longer lengths than standard concrete pipe, has better friction resistance and has a degree of flexibility.

A particularly challenging section of the work in Dundee is on a curve, below buildings and through a mixture of very difficult ground types.

'Using these pipes means it is much less of a headache, ' said Stanley.

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