M25 ERA bay 01

London - M25
Jun 2020
Oct 2020

For this bay, the earthworks solution was a sheet-piled retaining structure. This supports the new bay where the adjoining embankment slopes away sharply.

Site space was restricted in order not to disturb nesting birds.

  • Temporary works design
  • Vegetation clearance and tree stump removal
  • Installation of piling platforms
  • Pre-auger 170m length to prepare for the sheet piles

We installed 120 individual sheet piles to between 6.5m and 13.5m in depth. Initially using vibratory methods until refusal, and then impact hammering the piles a further 1-8 metres.

We installed drainage, NRTS communications ducting and infrastructure, electrical lighting infrastructure, and the sub-base of the carriageway.

We also carried out surface drainage installation of combined kerb and drainage units and pre-cast concrete slot drainage.

Skanska operations director, Jun 2020