CONSULTANCY CONTRACTS UK’s longest secant piling installed


What is thought to be the UK’s longest ever secant piling is under construction in north London. The works will form the perimeter of the inlet pumping station shaft at Deephams Sewage Treatment Works in Edmonton and are expected to make the nearby River Lee cleaner and healthier for aquatic life, as well as improving the riverside environment.


The approach has cut


temporary works costs by 20% and slashed a valuable five weeks off the construction programme. Contractor J Murphy & Sons says the challenging shaft design, resulting from the use of 29m long piling, has also triggered further innovative construction solutions – saving yet more time and cost. The obvious construction choice for a large, 18.5m diameter shaft, founded 24m deep in water-bearing Thanet Sands, was to use diaphragm walling – and Murphy tendered on that basis. Once on site though, the team looked again at the constricted location and reconsidered the construction method. The only other option, secant piling, was initially considered tough-going and risky. It would necessitate 29m-long male piles driven both through adjoining females either side, and into clays and gravels of variable strengths, to found in the cohesion-less sands. However, Murphy’s piling division has experience in Ireland where the use of lower strength concrete for female secant piles is often successfully adopted. Armed with this knowledge, the team opted to trail blaze with a UK first and halve the concrete strength of the 24m long female piles to just 10N/mm2, so considerably easing drilling of the longer males. Murphy’s contracts manager, Gavin Symonds reflected: “Not only has piling proved 20% cheaper, but it has also saved us an estimated six weeks on the diaphragm walling tender programme. The piling itself has been completed five weeks faster than we planned.”


n Q4/5111b Project Management Support Services


n Q4/5111b Leakage Detection n Q4/5111b Marine Surveys


United Utilities n Sewer Flood Mitigation with DCT


n Topographical & Underground Utility Surveys


Severn Trent Water n Lot 1 – Network Modelling (clean water) n Lot 1 – Leakage Strategy n Lot 3 – Leakage Consultancy, Project Management and Support


The Fluid Group South West Water


CFD Modelling, Water Treatment Dŵr Cymru Welsh Water


CFD Modelling, Wastewater Treatment


Hydro–Logic Thames Water


Low Flow Investigations (Environmental monitoring framework with APEM)


XII Consultant and Contractor File January 2011 Wessex Water


Low Flow Investigations Severn Trent Water


Water Resource Investigations (Hydro–Logic/ ESI/APEM consortium)


South East Water Low Flow Investigations


United Utilities


Water Resource Investigations (with Entec) Scottish Water


PR1 Water Resource Investigations Environment Agency


National Hydrometric Training Framework contract


Northumbrian Water MCERTS Inspection contract Yorkshire Water


MCERTS Inspection contract Anglian Water


MCERTS Inspection contract


Dŵr Cymru Welsh Water Water Resource Monitoring Network Environment Agency


National Telemetry Logger Framework contract


A team of Murphy’s new graduates observe the piling operation as part of their induction programme


Mott MacDonald –


Water Division Anglian Water


Providing Services to the Anglian Water @One Alliance – Special Projects


Cambridge Water


Networks – Lot 1 – Programme Management Office Services


Northumbrian Water Technical Services Framework


Scottish Water n Cost Consultancy Services


n Strategic Support Services n Design Services Framework n Wastewater Network Modelling and Planning Services Framework


n Provision of Consultancy Support Services Framework


n Data Collection and Management Services Framework


n Environmental Support Services Framework n Planning Services Framework n Process Audit and Research Support Services n Construction Delivery Partner (as Mott MacDonald Bentley) – Lot 1 Non-infrastructure and Lot 2 Infrastructure


Severn Trent Water n Contractors – West Area Non–Infrastructure Core Programme & Tendered Schemes (as Mott MacDonald Bentley)


n Contractors – Infrastructure Tendered Schemes (as Mott MacDonald Bentley)


Southern Water


Outsourcing Consultancy Framework Agreement for Engineering Services


Thames Water n Lot A Framework – South London – Designer to Morrison Utilities/Galliford Try joint venture


n Process Framework – North & South London in joint venture with Galliford and Biwater (GBM)


n Lot 19 – Direct Consultancy Framework Dŵr Cymru Welsh Water


Asset Management Services Framework


Yorkshire Water n Contractor – Reservoir Stream (as Mott MacDonald Bentley)


n Contractor – Other Installations Stream (as Mott MacDonald Bentley)


n Contractor – Sewerage Stream (as Mott MacDonald Bentley)


n Contractor – Large Schemes Stream (as Mott MacDonald Bentley)


n Design and Build Framework (as Mott MacDonald Bentley)


Mouchel United Utilities


Process Partner Framework (North) as part of KMI+ joint venture (Kier, Murphy, Interserve, Mouchel) 2010


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