The three firms, part of the Align JV that acts as the main works contractor on HS2, have produced the Krokodyl robot, which will be installed on two tunnel boring machines (TBMs). The robot, thought to be the first of its kind, is set to launch early next year and will be used during boring work on the two 16km-long Chiltern tunnels.
The robot, working in a similar manner to the robotic arms
used in a car factory production line, will carry out tasks such as removing
wooden spacers between tunnel segments and inserting connection dowels that
people would normally do.
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Tunnel segments weigh up to eight tonnes and are delivered
to the TBM with wooden spacers between them, which are generally removed by
hand. By fully automating this process, the Krokodyl removes the need for
people to work in this potentially hazardous area and helps with the
installation of the 112,000 tunnel segments.
The tunnel segments are erected – as the TBM moves forward –
in order to form a structural watertight ring designed to support the ground
loads.
A second feature of the robot, known as the Dobydo, then
places the dowels into position, ready for the segment to be slotted into
place. Again, by automating this process, the robot reduces risk to people and
improves safety and efficiency.
The Align JV built on its experience of delivering major
tunnelling projects across the world to develop the Krokodyl.
Eddie Woods, HS2 Ltd’s head of tunnelling, said:
"Safety is a key priority for HS2 and the introduction of these
innovations, which essentially remove personnel from harm’s way, are an
excellent example of the sort of initiatives we are pleased to see implemented
on the project. It is one of the ways that ‘safe at heart’ can be achieved by
minimising exposure in high risk locations."
Didier Jacques, Align's underground construction director,
added: "A lot of work has been undertaken by all concerned that has
enabled us to develop and introduce this robot, thereby reducing the risk to
our personnel. We are very proud of these innovations, which we would be happy
to share with tunnelling teams working on other projects across the world."
The two 2,000 tonne TBMs – named ‘Florence’ and ‘Cecilia’ –
are due to be launched early next year from a site close to the M25.
Both 170m-long machines are specifically designed for the
mix of chalk and flint they will encounter under the Chilterns. Operating a
pioneering ‘continuous boring’ technique, they are expected to take about three
years to excavate the 9.1m metre diameter tunnels, which will be lined with a
concrete ring made of seven separate segments as they go.
The TBMs will convert the spoil into slurry, which will be
pumped back to the Align main site where it will be treated before being used
for landscaping on-site, removing the need for additional HGVs on local roads.
