Challoch Clumps Underbridge Replacement

Story Scotland were commissioned by Network Rail to renew the timer waybeam structure at Challoch Clumps entirely.

THE PROJECT

UB 163/104 is a single span timber waybeam structure located between Stranraer & Girvan. The main scope of works was to renew the superstructure entirely. This was achieved using a standard Network Rail steel U-Type deck with ballasted track supported between new precast concrete cill units anchored down to the existing abutments along with low headroom signage and chevrons. Ballast retention was installed on all four corners of the new superstructure.

All existing P-Way was removed, renewed and reinstated over the structure along with lifts & slews on either approach to structure to accommodate new track alignment design.

1 no 54 hr

disruptive blockade

750 t crane

utilised for lifting

SCOPE OF ENGINEERING WORKS

The scope of the project was to design and implement
the following works:

  • Installation of TWs prior to the disruptive Blockade
  • Removal of existing structure.
  • Installation of Precast Concrete Cills and a New
    Steel U-Deck.
  • Installation of precast ballast retention units.
  • On completion of the structure installation,
    backfiling works and the welding and stressing
    of the track were carried out, and a tamper
    completed the lining and levelling of the track.
  • Temporary Works design to allow works to be
    carried out safely.
  • Methodologies developed to enable works to take
    place in close proximity to the railway utilising
    both RoTR and a disruptive possession.

DELIVERING A SUCCESSFUL SOLUTION

To allow us to celebrate success:

  • Early consultation with the local council and close
    residents resulted in good community relations.
  • Weekly meetings with the client resulted in good
    communication and understanding of the works.
  • Proactively managing unforeseen delays enabling
    us to maintain our original completion date.
  • Working efficiently with all associates involved as a
    team throughout out the project.

THE STORY WAY

Prior to any works commencing we issued letters to
all the residents in the surrounding area, detailing the
works that would be carried out and their importance
in improving the existing road over the railway. The
locals were therefore aware of why we were there and
how long for – an important factor as the road had
to be closed permanently for a period of time and a
diversion put in place.

During the unprecedented times of the COVID-19
pandemic, extreme measures were put into place in
order to reduce any chance of spreading the virus.

Thanks all for a job well done under very challenging external circumstances.

Allison Flanagan, Scheme Project Manager Scotland's Railway

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