A pre-assembled energy chain system from igus provides
fail-safe energy supply at the Memorial Bridge in New Hampshire, USA.
Spanning the Piscataqua River between Portsmouth, New
Hampshire and Kittery, Maine on the east coast of the US, the Memorial Bridge was
erected to replace the original one built in 1923 to commemorate local sailors
and soldiers from the First World War
A vertical lifting mechanism raises the Memorial
Bridge to allow ships to pass underneath. In operation, an average speed of 1
m/s is required for a total distance of 40 metres. To reduce maintenance and
increase overall reliability, the bridge builders used pre-assembled igus
readychains instead of the hanging cables from the original design. The cables,
which were harnessed with connectors and fitted in energy chains, were
pre-assembled in the igus factory nearby and delivered as ready-to-install
systems to be fitted onsite.
igus engineers used highly flexible chainflex cables
in the E4 energy chain as well as heavy-duty CFXL clamps for secure cable
strain relief. Each of the installed cable types including the CF300, CF9 and
CF34 motor cables and the 4-core CFLG fibre optic cable, were extensively
tested in igus’ 2,750 square metre test laboratory.
This allows igus to be the only cable manufacturer in
the world capable of providing a 36-month guarantee on their chainflex cables.
Complete harnessed systems as well as individual igus
components are available from Treotham Automation.
The readychain systems in operation can be viewed
in the video below.