Acton Dive-Under Project

Key Facts

  • Client: Network Rail
  • Value: £22 million
  • Location: Acton, West London

Acton Dive-Under is one of the most complex infrastructure structures being delivered for Crossrail.

Acton Dive-Under is one of the most complex infrastructure structures being delivered for Crossrail. It will provide a grade separation allowing freight services to leave the Acton Yard without impacting on passenger services when Crossrail opens in 2019.

In order to undertake the works, the route was divided into four distinct sections:

  • Section A – construct first half of the dive-under
  • Section B – carry out syphon diversion to safeguard against flooding
  • Section C – construct second half of the dive-under
  • Section D – complete works and lay slab track

A successful acceleration programme

Section A and B were carried out simultaneously. However, a delay encountered from previous works undertaken by another contractor meant we had to re-programme the works and accelerate delivery for Section C. Working closely with Network Rail we revised the construction sequence for the dive-under to ensure infrastructure required for the 2013 Christmas blockade p-way and signalling works could be delivered in time.

All works were carried out in a very narrow corridor next to an operational railway line. By engaging early with Network Rail and demonstrating our safe system of work, we installed 1400 piles within 5m of an operational railway with no incidents or disruption to the rail or sidings operations.

All large plant operating on site was fitted with Network Rail approved slew restrictors to ensure that the highest possible level of control was maintained throughout the project. Stringent lifting controls were also implemented to ensure safe execution of the works, with particular focus on mitigating the potential for any clash with Network Rail infrastructure.

Effectively managing interfaces

We engaged Bauer, our piling subcontractor, from an early stage of the project and were co-located as ‘one team’ with the customer and designer in the project offices. This had a positive impact and meant issues were overcome in an efficient manner using a ‘one team’ approach. All parties attended Beyond Zero workshops, ensuring everyone understood desired behaviours, the Lifesaving Rules and our shared vision of ‘Everyone home safe every day’.

During delivery of the dive-under, BAM worked in close proximity to multiple Principal Contractors and led monthly integration meetings to plan forthcoming works and minimise programme disruption. There was also a significant interface with freight operator DBSchenker (DBS) and we employed a full time Rail Interface Manager to manage this relationship, ensuring access was continually available.

Inclusive working – Health and Safety

As part of the team’s continuous improvement drive to raise plant awareness, all staff from both site and office were encouraged to sit in the cab of a tipper truck to gain an appreciation of the driver’s viewpoint and blind spots and an understanding as to why exclusion zones are established. This was particularly important on this scheme because of the restricted space on site.

The team was presented with a number of Network Rail STAR awards and the prestigious Platinum Badger Award, in recognition of their diligence to health, safety and the environment.