Metronet Rail: Buckhurst Hill Station

Client: Metronet Rail

Project: Buckhurst Hill Station- Ground Stabilisation Works

Value: £479k

Start: 2008

Completion: 2009

Scope:

Routine maintenance inspections by Metronet Rail had revealed structural defects to retaining walls to the subway approach areas on both sides of the tracks at Buckhurst Hill Station on the Central Line of the LUL system.

Following a period of site monitoring by the client, the cause was determined to be ground rotation resulting in the displacement of the subway walls. This had the potential of a catastrophic collapse, placing both the railway and members of the public at risk. Metronet Rail designed a retention scheme which was put out to competitive tender and awarded to Clancy Docwra Rail.

Works included:
 

• Closure of the underpass
• Construction of a temporary retaining system incorporating a hoarding to the platform areas
• Installation of 46 number piles (8-12m long) construction of cap and beam
• 300 number 25mm cores to hoizontal walls, with 33 number 75mm weep holes
• Fixing of 300 number horizontal stainless steel dowells 33 vertical cores (up to 3.5m long), placement of 33 stainless steel dowells
• Shuttering to three walls
• Concrete pours to realign 3 walls following piling works
• Realign footpath to improve disabled access
• Rendering of subway walls
• Decoration and electrical works