Linear sensors put Tower Bridge in position
A
Penny and Giles product story
Edited by the Engineeringtalk editorial team
Jun 25, 2002
Penny and Giles Controls has supplied 16 of its SLS320 sealed linear sensors to LES Engineering of Grimsby, as part of a major refurbishment project on London's famous Tower Bridge.
Penny and Giles Controls has supplied 16 of its SLS320 sealed linear sensors to LES Engineering of Grimsby, as part of a major refurbishment project on London's 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 bridge's 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.
LES Engineering, a multidisciplined national engineering contractor, specified the SLS320s with compact shafts, IP66 sealing and 10m cables.
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