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Contractors World

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Contractors World  - UK & Ireland
2014 Vol 4 No 3
 

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Innovative solution at Port of Liverpool - page 2 of 3

"As part of the passage widening works, we had to demolish the existing service culvert. As a result a service diversion ‘U-Tube’ was constructed to replace the existing culvert crossing the passage," explained Farran’s Section Engineer, Ryan Dillon.

The 710V Evolution robot is the most versatile hydrodemolition machine on the market, with the flexibility to work horizontally, vertically and on over-head applications. New service culvert

The new 120 m long ‘U-Tube’ comprises risers at either side which are each 20 m long, a 70 m straight section under the sea bed with a further 10 m section at a 60º angle around the eastern port side’s horizontal leg.

The 710V Evolution robot is the most versatile hydrodemolition machine on the market, with the flexibility to work horizontally, vertically and on over-head applications.

Fabricated from 1,020 mm diameter steel tubes, it contains a 315 mm HDPE water main, six 33 kV cables, three 11 kV cables and various port communications, all pre-installed as the U-Tube is prefabricated on a separate Quay.

This entire U-Tube structure will be transported from the prefabrication yard to the Seaforth Passage via a 250 tonne crane barge before being installed to its final position via a three crane lift.

Before this can be done, however, the receiving locations on both sides of the passage have to be cut out and removed in a controlled manner; in order to protect the integrity of the existing structure and to ensure it can be reinstated following the installation of the new U-Tube.

"Pneumatic or mechanical breaking wasn’t an option due to the vibrations it would have induced," explained Core cut’s Operations Director Ewan Crocker. "Drilling or hand lancing would also have required the erection of elaborate and expensive scaffolding and the use of man baskets.

"Due to the depth of the sections involved and the restricted working area – with slab depths in excess of a metre – floor and wall sawing and stitch drilling were also ruled out.

"We therefore proposed a combination of wire sawing and hydrodemolition techniques employing the Aqua Cutter Evolution 710V with its extension arms as a safe, cost effective and time-saving alternative."

The 710V Evolution robot is the most versatile hydrodemolition machine on the market, with the flexibility to work horizontally, vertically and on over-head applications. The unique 3D positioning of the front power head gives the operator full freedom to efficiently reach all areas without limitations.

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