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Bath Corridor Civils Works (Great Western Electrification programme)

Client: Network Rail

Contractors Designers: N/A (construct only)

Form of Contract: ICC Target Cost with NR12A amendments

Dates work carried out: 2014 - 2016

Value: £29,600,000

HOCHTIEF have been engaged to deliver clearance for the installation of 25kv Overhead Line Electrification (OLE) equipment on the Great Western Mainline. The 34 mile route stretches between Royal Wootton Bassett and Feeder Bridge junction (Bristol). A critical and complex part of the route passes through the Bath World Heritage Site.

HOCHTIEF’s scope includes Structures, Stations, and OLE works including the following principal activities:

  • 8 Overbridge reconstructions including 5 foot bridges, 1 aqueduct, and 2 road bridges
  • 34 Overbridge and Tunnel portal parapet raising works including a significant number of Bath stone structures
  • Box Tunnel civil work including subway infill and ventilation shaft grilles
  • Sydney Gardens civil works including raising parapet heights to line side retaining walls, landscaping, and works to 2 listed bridges
  • Station works at Bath Spa and Keynsham
  • OLE piled and reinforced concrete foundations for electrification structures over 11 miles between Box and Saltford tunnels
  • OLE bespoke foundations and masts in the Sydney Gardens section
  • OLE bespoke foundations and masts at Bath Spa station
  • OLE foundations and masts at Keynsham and Oldfield Park stations
  • OLE foundations and masts at 8 existing Viaducts
  • OLE fixings, support structures, and conductor bar inside 9 existing Tunnels

Works effecting the operation or safety of the existing railway infrastructure will be carried out during possessions. These include Rules of the Route access on Monday to Thursday, and Saturday nights, and longer abnormal possessions at certain weekends and bank holidays.

Particular challenges on the project that the HOCHTIEF team will proactively manage include:

  • Working in a World Heritage site and on Listed structures
  • Ecological constraints including the management of protected species
  • Environmental constraints including the management of noise and vibration
  • Stakeholder and Community communication
  • Logistical planning in remote and built up areas
  • Limited access to the railway lineside
  • Bath stone works
  • Interfaces with other delivery units

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