However, the entire lifting assembly crashed onto the adjacent buildings while the section was being manoeuvred. There, it was to be raised and fitted into the existing bridge. The section would then be manoeuvred in between the two cranes before being tilted into an almost horizontal position, ready to be sailed 100m to the installation site.
Two mobile cranes – of 400t and 700t capacity - were each placed on separate barges with the aim being to lift the bridge section from a third barge in a tandem operation.
The accident happened in August 2015, when a new section of the Koningin Julianabrug in Alphen aan den Rijn was due to be lifted into position. The report by the Dutch Safety Board (DSB) found serious deficiencies in the way risks were addressed and has recommended actions for the companies involved, government and the wider construction sector to avoid similar failings in future.
The lifting system was so unstable that even a flawless execution of the plan would have been doomed to failure. Both cranes and the bridge section toppled into an adjacent built-up area, destroying a number of homes and shops but – miraculously - causing no injuries.
0 kommentar(er)
