Contractors World UK Ireland Vol 6 No 2
be a challenge when carrying out inspection
work. Together with Lanes Group, we used CCTV
and new ways of working to overcome this issue
and deliver this part of the project ahead of
The CCTV surveys are being carried out on the ‘six
foot’ central tunnel drainage culvert between the two
lines that run through the tunnel, which is 7,008 m (4
miles 24 yards) long.
The culvert ranges up to 1200 mm wide and up to
500mm tall. Over a number of decades, the original
brick-built culvert has been repaired, so in some places
is lined with concrete or steel.
One of its main tasks is to collect water from the
‘Great Spring’ which seeps into the tunnel. An estimated
50 million litres of the spring water are pumped from
the tunnel every day and released into the River Severn.
The joint Lanes Group and Amey teams had to walk
three miles to the Welsh end of the tunnel, then up to
another mile into the tunnel, to reach their work sites,
with equipment transported on rail trolleys.
Working in 12-hour shifts, two four-person teams -
made up of two CCTV survey engineers and two Amey
track operatives - worked away from each other from a
central point, overseen by a Lanes Group supervisor.
Robotic crawler cameras were used to record HD-
quality video of the inside of the track culvert. This
method was augmented by the deployment of zoom-fo-
cus pole inspection cameras.
Lanes Operations Manager Mark Scott, one of the
site supervisors, said:
“Where track ballast had blocked the culvert,
stopping the crawler camera from getting
through, the pole camera allowed us to look past
the blockage and ascertain its condition.
“It was one of the approaches we devised
for this particular project to allow us to maintain
high levels of productivity in challenging condi-
tions, as we want to achieve as much as possible
in the track possession time we have.”
The Severn Tunnel was built by the Great Western
Railway between 1873 and 1886. It held the record as
the longest main line rail tunnel until the High Speed 1
tunnels in Kent opened in 2003.
Beam Grab Improves Delivery of
Lynx Precast supplies a range of products to all sectors
of the UK construction industry including housebuild-
ers, main contractors, groundworkers, civil engineering
contractors, builders merchants and self-builders.
Lynx Precast understands that each site and cus-
tomer has different delivery requirements and expec-
tations, and that when delivering its products, vehicles
and material handling attachments must be specified
To aid in delivering customer service, Lynx Precast
contacted B&B Attachments to supply it with beam
The grabs fitted to Lynx Precast crane delivery ve-
hicles, assist in the smooth delivery process of beams
where “supply only” customers do not require the aid
of mechanical offloading facilities on site.
Each Beam grab, with optional lifting hooks and a
rubber pad gripper arrangement, is designed to pick
up a range of different sized beams and profiles. Lifting
either 4 or 6 beams at once, the beam grabs supplied
to Lynx Precast also have individual ball lock valves
fitted, which enables single beams to be clamped and
released when required.
The universal crane mounting plate enables the at-
tachment to suit various adaptors, and the quick release
couplings allow a quick change over to alternative at-
tachments when required.
Andy Teasdale, Managing Director at Lynx Precast
“Our customers are our priority. We wanted to
make our delivery process as smooth and as safe
as possible. The Beam Grabs supplied and
manufactured by B&B Attachments have helped
us to achieve this. The ease of use and reliable
operation of the attachments when moving our
products has also helped improve daily
•B&B Attachments Ltd