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School Hill & Addison Road HDD UTX

Project Location:

Calvert, Buckinghamshire

Client Name:

HS2 / Fusion

Project Description:

OCU delivered complex utility diversion and under-track crossing (UTX) works at School Hill and Addison Road as part of HS2’s Enabling Works Contract in Calvert, Buckinghamshire. The programme comprised two phased schemes to divert critical utilities away from the HS2 trace, construction compounds and access routes.


Works included multiple HDD-installed UTXs beneath live rail infrastructure, utility diversions for power, water, foul sewer and telecoms, and associated civils works. The successful delivery enabled the main HS2 alignment to progress without project delay or land boundary impacts.

Key Stats:

  • Two phased UTX schemes delivered at separate locations 

  • 12 HDD installations completed across both phases

  • 2 × 380m HDD sewer sleeves at Addison Road

  • 10 HDDs and approx. 500m of open cut works at School Hill

  • Utilities diverted: power, water, foul sewer and telecoms

  • Works delivered within planned road and rail possession windows

1.5 Years

Duration

Challenge

  • Installing UTXs beneath live and proposed rail infrastructure including HS2, Network Rail and East West Rail

  • Managing multiple utility asset owners and temporary/permanent diversion requirements

  • Limited space for access, compounds and material management

  • Coordinating works within tightly controlled road closures and possessions

  • Maintaining safety and compliance in a high-risk, multi-interface environment

Solution

  • Produced Network Rail–compliant settlement calculations for multiple duct and pipe sizes across bores at varying elevations

  • Delivered works in phased construction, separating Addison Road and School Hill activities

  • Designed and installed bespoke HDD solutions beneath live rail assets

  • Coordinated closely with Fusion, HS2 and utility owners on connections and commissioning

  • Managed access, drive and reception pits, and spoil removal within highly constrained sites

  • Completed multiple utility crossings within single road closures

  • Integrated HDD and civils teams to maintain programme certainty

Outcome

  • All UTX and utility diversion works delivered safely and on programme

  • Successful testing, chlorination and commissioning of diverted water assets

  • Multiple utility crossings completed within planned road closures

  • Works enabled HS2 main works to proceed without deviation to

  • land boundaries

  • Delivery recognised by client for performance and collaboration

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