Scope of Works
Work involved replacing existing 40mm and 50mm mains with 125mm PE. UEA offered a complete package by performing all works with internal HDD and civil crews. Other works included temporary water supplies, service connections as well as the testing and commissioning of the main.
The package was designed as an open trench contract, but UEA proposed horizontal directional drilling (HDD) as an alternative so as to reduce the impact on the local community, limit disturbance to the natural surface and reduce restoration. UEA used a combination of technologies to install the new mains – HDD, bed boring and conventional trenching techniques.
CHALLENGES
UEA and the client worked together to overcome design issues before crews mobilised to site in order to avoid delays. UEA’s crews completed all components of the project, providing a streamlined project with only one point of contact. The greatest challenge was the different ground conditions, including soft water charged clay, beach sand, shale and hard rock. UEA’s experience, combined with the choice of drill – a DitchWitch AT3020 HDD rig – allowed the team to overcome these issues.
COMPLETION
UEA’s ability to provide multiple disciplines to install the new water mains was a huge success, and in doing so reduced the impact on the residents, particularly around restoration and traffic congestion.
