Contractors World


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Contractors World UK & Ireland
2012 Vol 2 No 3   
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Adopting the Kijlstra solution meant that Blackwell’s site team was on a sharp learning curveMore flood alleviations works - this time at Wakefield - page 3 of 3

The upstream control structure comprises pre-cast Kijlstra wall units grouted onto an in-situ concrete base slab with Kijlstra headwalls located at either end. “The headwalls are located back-to-back and a penstock is installed at one end to control the water flow,” explains Wieger Faber.

The penstock can be opened and closed manually but electronic remote control also allows the valve to be operated remotely at the flick of a switch.

The downstream structure and pumping station also comprises pre-cast wall sections sitting on an in-situ base with Kijlstra top slabs and two headwalls.

Adopting the Kijlstra solution meant that Blackwell’s site team was on a sharp learning curve. “The guys on site had never used the system before and there were a couple of issues with alignment of the precast units and with grouting the steel dowel-bars,” admits Mr Holden.

“But Kijlstra were magnificent. They provided us with first-class technical backup so that, even though this was the first time we used the system, we quickly got used to it and produced a good result,” he adds.

CA Blackwell is now an enthusiastic convert to the off-site technique and Mr Holden believes that it offers considerable scope for environmental and time-saving benefits: “In fact, we are now actively looking for ways of incorporating this type of pre-cast concrete in future projects of this type,” he says.   According to Wieger Faber, building this type of structure with pre-cast units can save huge amounts of time. “We installed an entire chamber in one day. With in-situ concrete it could have taken four or five weeks to complete,” he says.

On this project, the time-savings were less dramatic, mainly due to the construction team’s unfamiliarity with the system. “Taking into account the total contract time and the changes we had to make, we estimate that the Kijlstra units still cut the amount of time spent on site by about a week,” says Phil Holden.

CA Blackwell is now an enthusiastic convert to the off-site technique and Mr Holden believes that it offers considerable scope for environmental and time-saving benefits: “In fact, we are now actively looking for ways of incorporating this type of pre-cast concrete in future projects of this type,” he says.

400 Homes made safer

In June 2007, severe flooding affected large areas of Agbrigg, causing disruption to the A638 Doncaster Road and flooding around 400 homes and businesses. ow that the Environment Agency has implemented its flood relief plan, these homes and businesses are more secure.

The total project involved creating an additional channel to take the extra storm water from the beck to a flood water storage area upstream of Doncaster Road; building of a flood embankment with small section of flood wall and replacement of the culvert at Agbrigg Farm.

The channel diversion and storage area will only be used when the beck levels are high in times of flood. During normal conditions the beck will flow naturally in its original channel.

Click here for more information>>>
>>> Kijlstra precast solutions
>>> CA Blackwell Contractors

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Page updated: March / April 2012

 

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