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Case Study

First Case Studies

  • Category: Roto Hire
  • Read Time: 15 mins
  • Published: 18/04/2024
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Snapshot

Specialist railway drainage contractors Super Rod have solved a historic flooding problem at a railway station surrounded by equally historic castle walls, using UTAS RRAPs from TPA’s Rapid Rail Access division for the first time.

The Project

Conwy railway station is set in a wet cutting surrounded by the historic walls of Conwy Castle. The area leading into the station on the high mileage had catchpit drainage that was completely blocked with debris and roots which was flooding the cess and 4ft on the up line, damaging the track.

In addition, the outfall for the system was unknown and required exploration.

Network Rail tasked Super Rod with clearing and proving all drainage within the railway station in North Wales and condition reporting the outfall system.

jcb-1.25qe-power-pack-for-the-jcb-525-60e-electric-telehandler
merlo-carriage-hook-attachment-for-merlo-heavy-lift-telehandlers

The Challenge

The challenge was accessing the track at an approved on-track plant access point with no permanent RRAP installation. In addition, Super Rod have used TPA’s RRAPs, mainly foam RRAPs, over the past few years, but never before the UTAS RRAPs.

Solution

A pair of UTAS RRAPs from TPA’s Rapid Rail Access division were lifted into position by a track side 360 excavator at the approved access point of 225m 41ch. The system was staggered over both lines which gave the Super Rod team perfect control over the OTP to reverse directly onto the track.

The team accessed the up line and vactor removed all debris within the catchpits and pressure jetted all lines clear. The connecting pipes contained 90% silt and a heavy root content. Where the cess drainage merged into the 6ft before travelling through the tunnel, there was a heavy calcite content that required significant pressure jetting.

Upon exit from the tunnel, the drainage flowed down the 6ft through the station. Before exiting the station, one run between catchpits was partially collapsed, and although Super Rod managed

to clear this to aid the flow, further work is required. In addition, upon exiting the station, the system was lost under the 6ft ballast but the team managed to locate several buried catchpits which were cleared and proved.

The outfall was then located at a distance of 60m, travelling from the system within the 6ft under the tracks and out to an overgrown culvert that requires third party access to clear and prove on further works.

The system was left clear and flowing, with the outfall functioning, but further work is required. The flooding within the cess and 4ft was cleared.

“This was a good overall result, with flooding removed from the track area, thanks to the ease of access and egress using the TPA UTAS. There was good collaboration with Network Rail and great line-side contact with the general public who were spectating on the over bridges and platform during the works which were all completed safely and to a high standard in 24 hours.”

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