Civil: Sealing Water Ingress In Watford Tunnel Roof

Sealing Water Ingress In Watford Tunnel Roof

Location: Watford, UK

In Watford, UK, an existing tunnel needed immediate refurbishment as the brickwork was in poor condition with unacceptable water ingress. However, before any injection work could be undertaken to rectify the water ingress, the brickwork had to be supported by steel straps and timber. The sealing work had to be done over two weekends, requiring both Saturday and Sunday night shifts.

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Site

In Watford, UK, an existing tunnel needed immediate refurbishment as the brickwork was in poor condition with unacceptable water ingress. However, before any injection work could be undertaken to rectify the water ingress, the brickwork had to be supported by steel straps and timber. The sealing work had to be done over two weekends, requiring both Saturday and Sunday night shifts.

Solution

To solve the problem, Minova provided both expert management and an installaton team to develop a plan for drilling and injection during the short time frame given. 

To drill and inject Carbostop U and CarboCrackSeal H plus. Drilling was done around the arch of the tunnel, starting and stopping at 1 m from track level, with a series of 10 mm holes at 250 mm centres. 

In total, more than 30 holes were drilled and 10mm packers installed.  These were then injected with a combination of Carbostop U and Carbocrackseal H Plus. The injection work stemmed the water completely, hence the steel and timber supports could be removed and the complete area could be re-pionted.

Results

The provision of Minova injection materials, acces-sories and our knowledge in the systems proved the ideal solution for this application. The injection work stemmed the water completely, hence the steel and timber supports could be removed and the complete area could be re-pionted.

Minova key contributions to the success of the project can be listed as follows:

  1. Minova provided a “one-stop-shop” in terms of the necessary products, materials and accessories. Minovas ability to offer advice and provide a num-ber of products and systems in relation to any water ingress problem large or small, saved time and pro-vided a quick complete solution to the problem.
  2. The swift and immediate drilling and injection system from Minova, allow for water stopping work to be undertaken in a short timescale.
  3. By using the Minova expert management and installation team, the contractor was able to develop a Method of Work plan (MOW) that ensured the works could be complete within the stipulated timescale.