A childcare centre, units, part of a Westfield carpark and other buildings within a 75-metre radius of the Chatswood site were evacuated as a precaution during the operation.

The truck was pumping concrete onto the roof of a four-storey construction site on Devonshire St when it toppled just before 9am, leaving its boom resting on the building.

No one was injured and people were allowed back into their buildings after 1pm.

Initial evacuations were extended to a 75-metre radius of the building site as a precaution.

Bad ground conditions  Not enough dunnage?

Hmmmm their not showing the problem side!

maybe buddy tried to pick some system up while attached, and it tipped the pump up causing the rear rigger to fold in. -shrugs- .. Its a shame that happened :/

Mr Perkins looks like your right

Apparently the back leg collapsed into an underground cavity that wasn't supposed to be there.

Yea you can see that the right rear most be in the ground. Otherwize the rear of the truck would be hanging i the air..