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Contractors World  - UK & Ireland
2014 Vol 4 No 3

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Innovative solution at Port of Liverpool - page 3 of 3

Unique Proposal

Corejet was the only company to propose diamond cutting and hydrodemolition without sub-contracting to a third party; a core reason for them to order the Aqua Cutter.

Corejet proposed using hydrodemolition techniques with the Aqua Cutter and its extension arm allowing it to reach 3.5m over the side of the dock – saving both costs and time on the project.

Wire sawing allowed Corejet to initially move large sections of concrete from both the receival locations over areas 3.5 metres wide and 2.5 metres long and also up to 3.5 metres deep.
In total some 260t of concrete was then removed in around 14 lifts ranging from five to 34t – and all as the busy shipping passage operated as normal around the work.

The 710V Aqua Cutter was then brought in to remove up to a depth of 500 mm of concrete from both end walls to expose the rebar. In total Corejet was able to remove more than 26 m³ of concrete safely and efficiently from both receival locations.

The Aqua Cutter normally operates at a pressure of between1000 bar – 2500 bar, but Corejet ran it successfully at 900 bar to carry out this work

The Aqua Cutter normally operates at a pressure of between1000 bar – 2500 bar, but Corejet ran it successfully at 900 bar to carry out this work.

Working remotely and largely from the top of the dock walls, Corejet’s robot cut in a trapezoid pattern to remove the concrete, at certain points with the power head – which contains no sensors – working below the water line.

"Robotic hydrodemolition provided the safest and most controlled solution for this job and the use of the extension arm and small hood allowed it to get at otherwise unreachable sections without the need for any additional temporary works," says Farrans’ Ryan Dillon.

"It also made it possible to remove the slab which was permanently submerged below dock water level in an accurate and safe manner. The daily yield was very impressive."

"The Aqua Cutter can get where other equipment can’t," added Ewan Crocker.

Aqua Cutter operators Hugh McCrory and Andrew Ramsay, with experience of competitive units, highlighted a key feature of the Evolution 710V machine being the independent movement of each track.

"We are able to widen or reduce the width of both tracks to allow greater stability of the robot whilst working within the very compact work space dictated by this job," confirmed Andrew Ramsay.

Core Cut Ltd

Core Cut Ltd, headquartered in Broxburn, West Lothian in Scotland, has built a solid reputation in the field of diamond drilling, concrete sawing and controlled demolition.

The family-run firm was founded by Ewan’s father Alaister in 1976 and is now run by Ewan and his brother Finlay, as Managing Director.

They made the decision to invest in an Aqua Cutter 710V Evolution late last year; placing the order through the UK dealer, Aquapower Ltd.

"We quickly recognised the potential for hydrodemolition and as such set up a sub-division to handle the business named Corejet.

It’s a natural extension of our service package and completely complements our drilling and concrete sawing activities," confirmed Ewan, adding, " it’s really paying dividends for us in securing contracts such as this one where we were able to beat off considerable competition."

For more information:
>>> Core Cut Ltd

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