Problems with external concrete sprawling have been known about for several years, but engineers and maintenance contractor Amey have called for extra time to assess the extent of damage within the 900m bridge structure. The flyover was closed on 23 December due to concerns about a serious structural defect.
The damage to the ageing 1960′s structure has been caused by water ingress, including salt water due to grit laid during the winter months, which has corroded and weakened supporting cables.
Article Source: http://www.constructionenquirer.com/2012/01/03/serious-corrosion-keeps-a4-flyover-closed/
Publication Date: 03 Jan 2012
Referred by: http://integritythatworks.wordpress.com/2012/01/03/serious-corrosion-fears-keep-vital-road-in-london-closed/