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Posted: Tuesday 6th July 2010

A revolutionary pre-cast concrete manhole that can typically be installed up to 16 times quicker than traditional systems on standard units has been launched in the UK by European construction materials giant Kijlstra.

Manufactured from self-compacting concrete and poured monolithically with benching to guarantee optimum size consistency and strength, the system is combined with a perfect finish that gives a 120-year design life.

And once on site, the Kijlstra standard square manhole can be typically installed by just a couple of men and an excavator in 30 minutes compared to the one to two days it takes on average to install traditional round manholes.

This off-site ability means the Kijlstra system is cost effective in multiple ways, from requiring less men, materials and plant to start with, to taking less time, and therefore money, to install.

In addition, because the manufacturing process ensures the square manholes are just as strong and robust as their predecessors, they do not need reinforcing or shuttering, saving more time and minimising Health and Safety issues.

Unaffected by the extremes of the British weather that can bring the pouring of concrete to a grinding halt, their self-containment also means there is less on-site wastage.

Kijlstra has a sales and training facility in the UK, near Stratford-upon-Avon, Warwickshire. Manholes and other pre-cast systems are manufactured at Kijlstra’s two state-of-the-art production facilities in the Netherlands. Kijlstra has formed partnerships with key distributors within the UK to keep lead times to a minimum.

WRc-approved (certificate number PT282/0409) and Kitemarked in respect of BS EN 1917:2002 (number 538355), the manholes are manufactured toconcrete quality C40/50 and Environmental class XA3, with lifting anchors for ease of lifting and placing.

Different modules such as base units, raising units or slab units come with a socket-spigot connection which is 100% watertight without the use of cements or sealants. The manhole can be fitted with various options including flow control devices such as flap valves, penstocks and hydrobrakes, valves and pipework for pump stations and valve chambers, and special chamber linings.

The revolutionary square manholes have already been used in the UK on several high-profile developments. They are particularly effective where there are poor ground conditions and a high water table. The manhole has a proven track record, over several decades, dealing with the extreme conditions experienced throughout the Netherlands.

An installation video can be viewed on You Tube on

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