Ashleigh Contracts were engaged by Main Contractor McLaughlin & Harvey as specialist marine subcontractor in early 2023 to undertake the stripping of approx. 430m length of DP World’s London Gateway Berth No. 4 Revetment protection and subsequent bulk Infilling to the new Combi-Wall Piled Quay Wall. Further ancillary works awarded to Ashleigh included the sand infilling of the Dia. 2.03m Quay Wall Piles.
Ashleigh’s involvement following behind McLaughlin & Harvey’s new Combi-Wall Piling installation along Berth No. 4 comprised:-
- Removal of the temporary rock armour, underlayer and geotextile Revetment materials originally constructed by Ashleigh in 2012 along the Reclamation Area formed by DP World when they originally constructed the first phase of the Deepwater Quay berths at London Gateway.
- Installation of a bespoke Silt curtain manufactured to mirror the 50m wide Revetment profile from the shoreline above the High Water Mark to the New Quay Wall )Varying in depth from -15m CD to -9mCD). The Silt Curtain had to be installed ahead of any dredging or Infilling works behind the new Quay Wall to minimise siltation into the Thames water column. The silt curtain had to be moved repeatedly along the Revetment as the Piling works progressed.
- Dredging along the toe of the Revetment with a long reach excavator from a modular spudleg Barge to undertake pile proving (i.e. clearing any obstructions) ahead of future CFA Piling.
- Uplifting stockpiled sand from the Reclamation Are, hauled and places as Bulk Infill to the New Quay Wall – with the Infill level taken to the underside of the proposed Tie Bars @ circa mid-tide level.
- Infilling of the new Dia. 2.03m Combi-Wall Piles from existing bed level to the underside of the Tie Bar concrete plugs using the Long Reach Excavator and modular spudleg barge.