Town footbridge temporary fix

So the temporary fix is being tried out, with the rather heavy weight positioned to hold the bridge down into place while new fixings are installed. Hopefully the bridge walkway will stay down when those weights are removed!

IMG_6203

IMG_6205

Eight holding down bolts fix the deck walkway in position and prevent it from moving excessively under live pedestrian loading. It’s believed the bolt failure has been caused by a combination of

– de-icing salts which have penetrated onto the tops of the bank supports and ‘eaten’ away at the high tensile steel bolts

– cyclic fatigue failure due to pedestrian live loading

– contraction of the main cables and lattice steelwork caused by the recent prolonged cold temperatures.

It is thought the problem has built up over a number of years but remained hidden from view due to the design detailing.

Advertisements