Watford Tunnel Brickwork Repairs

Client: Network Rail (via OHLE Renewals Programme)

Location: Watford Slow Tunnels, Hertfordshire

Overview

As part of the Overhead Line Equipment (OHLE) Renewals Programme, PACE Infrastructure Solutions Ltd was appointed to deliver essential remedial works within the Watford slow tunnels. Defective Victorian-era brickwork had been identified at critical locations earmarked for new OHLE bracket installations—necessitating a pause in the main contract works. PACE was tasked with developing and executing both temporary and permanent engineering solutions to safely address these defects and allow the primary OHLE works to resume without delay.

Our Scope

PACE’s comprehensive delivery included:

  • Development of temporary and permanent works designs
  • Implementation of brickwork re-casing, pinning, and grouting repairs
  • Use of a traditional re-casing method and an innovative realignment solution tailored to tight possession access windows
  • Execution of all construction works by experienced bricklayers, grouters, and tunnel operatives
  • PACE managed both the design and build aspects of the scheme, ensuring rapid mobilisation and effective delivery in a live railway environment.
    • Technical Approach

    PACE’s engineering team devised a dual-solution strategy, combining traditional re-casing with a bespoke realignment method that reduced brick face working time—crucial given the limited possession access. Design and construction were closely coordinated to meet safety and performance standards, with works executed in strict compliance with the approved temporary works designs.

    Outcome

    All brickwork repairs were completed within the project timeline, enabling the suspended OHLE works to resume safely and without further delay. PACE’s integrated design and construction approach ensured high-quality outcomes and demonstrated its ability to solve complex challenges under operational and time-sensitive conditions. This project reinforced PACE’s reputation for delivering engineering-led solutions within heritage infrastructure environments.