Case Study
Utility Tunnels, UK
Project Value: £30k
Scope of Works
Apex Engineering Service’ client commissioned us to survey the
entire underground tunnel structure – including the tracing,
labelling and mapping of all high voltage utility cables –
within a limited time-frame. Our access to the underground
facility was limited to a 15-day window of opportunity. Within
that time, we were required to survey the full extent of the
tunnelling, including marking up/labelling all cables from entry
to exit points.
Methodology
We employed Leica HDS 6000 laser scanners, which have a scan
duration of one minute, 36 seconds per setup, and a total of 266
scans were needed to complete the survey.
Our use of high definition laser scanners meant we were able to
complete the site survey works within 10 days, a full five days
ahead of schedule. The completed deliverables were issued to our
client within just one month of our leaving site.
Deliverables
We produced a complete set of drawings for the full extent of
the underground system on an Ordnance Survey grid. The drawings
included a comprehensive map of all utility cables from entrance
to exit; levels and clearance heights to all tunnel entries and
exits; cross sections at every intersection; and evenly-spaced
sections between junctions. A total of 117 cross-sections were
drawn up and labelled, including long sections at essential
runs. Watch the movie:
We also provided our client with a copy of the Tru-view files,
which deliver a 3D interactive photo environment of each
scanning location. By using the key plan, our client could
visually inspect and interrogate any point on the tunnel where
the scanner was set-up. This enabled personnel, who had never
set foot on the site, to view and interrogate the tunnels
remotely from their desktop without the risk or expense involved
in a site visit.
