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GRUNDOPIT 400S hard at work installing gravity sewers

27.11.19 - Barhale is one of the country’s largest privately-owned civil engineering and infrastructure specialists and has 35-years’ experience in the water, transport, built environment and energy sectors throughout the UK.
To complete some of its on-going projects, particularly in the water and energy sectors, the company has embraced trenchless technology and uses a GRUNDOPIT 40S Mini HDD rig for the quick and economic installation of property service connections for gas, water, electric, FTTH and sewer pressure pipes.
The compact machine is manufactured by TRACTO-TECHNIK and is a pit launched, horizontal directional drill rig that is fluid-assisted for ease of operation. Its most recent outing was on a £3.7 million ‘First Time Sewerage Scheme’ in Bythorn and Keyston near Kimbolton which was undertaken by Barhale Construction as part of Anglian Water’s AMP 6 programme. As framework contractor, Barhale was appointed to provide a new public sewerage system to reduce environmental issues in the local area.

To ensure minimal disruption whilst connecting households to the new sewer network the pipework was laid under the local roads using the GRUNDOPIT. The rural nature of the villages and location of the manholes and route down to the pumping station meant that some of the crossings were up to 4 metres deep. Ten different locations were used to install 125mm SDR 11 MDPE sewerage pipes with drill lengths from 10m up to 45m, and depths of 4m to 1m deep.

The beauty of using the GRUNDOPIT is its ability to operate out of a 1200mm manhole ring. The contractor can therefore build planned manholes and double up by using them with a small hole cored for the rig to push through its drill head and pilot rods prior to back reaming and installing the pipe.
The use of rigs to install gravity sewers is not new, but the ever-increasing accuracy of walk over tracking systems, capable of reading to 0.1% gradient, is helping contractors to complete installations in quicker time frames with less hassle for local residents.
Dominic McDermott works for Barhale HQ in Walsall and is a fan of the technology;

“On this particular project, the longest crossing undertaken using the manhole launched rig was 45m from a manhole 4 metres deep. Not only did the drill path cross under the road, but also under the hedge, lawn and block paved driveway of a private property up to the garage to a depth of 1.2m where the household sewer outlet was to be connected. An operation that took only one day using trenchless technology would not only have taken a couple of weeks using traditional open cut methods, but would have required a full road closure, removal of excavated material, importing of back fill material, tarmac reinstatement, let alone the reinstatement of the private garden and driveway. The GRUNDOPIT is instrumental in these efficiencies. It’s a superb piece of kit and one we could not be without.”
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