PENNY & GILES SENSORS SPECIFIED FOR TOWER BRIDGE PROJECT
Penny & Giles Controls has supplied sixteen of its SLS320 sealed linear
sensors to L E S Engineering of Grimsby, as part of a major refurbishment
project on Londons famous Tower Bridge.
Opened in 1894, Tower Bridge is the most sophisticated bascule (French for
seesaw) bridge ever built. Each bascule or arm weighs more than one thousand
tonnes and opens on average twice a day. The bridge also carries around
forty thousand vehicles and eleven thousand pedestrians every day.
The SLS320 sensors provide feedback on the position of eight resting blocks
(tapered wedges) that are used to adjust the bridges two bascules. The
resting blocks move to take the load off bearings and spread it evenly, give
better support to the bridge in its resting position and adjust its resting
height for better alignment.
East to west movement of the resting blocks changes their vertical height in
relation to the bridge deck, either increasing or decreasing the support.
Each of the resting blocks is fitted with two SLS320 sensors - one on duty
and one on standby - to indicate its position. Each one is also fitted with
a load cell to indicate the load applied in that position.
L E S Engineering, a multi-disciplined national engineering contractor,
specified the SLS320s with compact shafts, IP66 sealing and 10m cables.
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