Horizontal Directional Drilling (HDD)
Haddington Utilities, Letham Burn
Crossing under a bridge with unknown footings whilst keeping a clearance under the Letham Burn.
Open cut – Not an option with the bridge in the way and no other wayleave options available.
Augering – Pits would be too deep at a depth off 3.5m which would have required a road closure.
Thrustboring – Not an option due to the number and size of ducts.
Microtunneling – Discounted due to costs.
Directional drilling was chosen due to costs, speed of installation and the impact to the local community. Inconvenience was minimised as it was all executed under a single lane closure so road access was maintained at all times.
The award for this job was awarded after a tender process and was awarded on previous experience and confidence of the client that the works could be done on time and on budget.
In addition to the drilling our scope of works including opening notices, traffic management, supplying of all the pipework and jointing. Excavation and backfilling of any launch, trial and receive pits were also carried out by ourselves.
All works were completed on time and budget with a happy client as they had visions of a site that they couldn’t sell any houses due to utilities not being connected in time. The council were also happy that the integrity of their bridge wasn’t compromised at all during the works with no leakage of drilling fluids noted at any stage of the process into the Letham Burn.