Crossrail is amongst the most significant infrastructure projects ever undertaken in the UK – from improving journey times across London, to easing congestion and offering better connections. Crossrail will deliver a high frequency, high capacity service to 40 stations linking Reading and Heathrow in the west, to Shenfield and Abbey Wood in the east via 21 km of new twin-bore tunnels under central London.

PaSCoE have provided a range of temporary works design services to the Crossrail scheme, one of the most innovative being the design of a temporary stop end wall to the Stockley Airport Junction Eastern Flyover.

Carillion Civil Engineering are constructing reinforced concrete troughs to support a new rail line with one of the troughs being filled with a lightweight aggregate fill (Leca). To facilitate the construction programme a temporary stop end was required on the Leca fill.

Conventionally this would be achieved using a bund of conventional fill to restrain the light weight material, however due to the potential for differential settlement along the new rail a solution was required that would utilise the Leca as the retaining structure.

PaSCoE designed a geogrid reinforced soil steep embankment to overcome the problem and provided the Network Rail F002 and F003 approvals documentation.

The steep slope was successfully installed with the LECA material being blown into position, saving considerable time and resource.