Building is underway to build more campuses for the ever expanding University of Technology, Sydney. Once seen as a second tier uni compared to UNSW, Sydney University and Macquarie University, it seems it is flush with funds and expanding at incredible pace. It is currently in the progress of building a Frank Gehry designed building near the Ultimo TAFE building, and this site at Broadway which for people who do not know Sydney is just outside of where the city starts.
The crane failed from a fire that weakened the steel causing it to collapse from its own weight, however the interesting thing is that whilst the jib is a total wreck as well as the platform and perhaps the controls, the tower crane mast seems to be intact.
The crane was removed however the mast remained, it was quite interesting an empty mast on a running building site, however it was also disrupting, on the weekend the site would get permits to block off the street and have a couple of large mobile cranes lifting and unfortunately this is the way i go to much work.
We that has come to an end, there is now a new crane in on that mast, I will upgrade with pictures asap, they work very long hours on that site, I imagine they must have a lot of work to catch up on, with all that overtime the crane operator will have no mortgage at the end of this job I imagine, good luck to him :)
tower crane load chart
An important part of the tower crane is the load chart, really it is essential that the crane operator as well as the crane crew knows the load chart back to front. The chart will tell the crane operator as well as his dogman,and rigger what they can lift at what radius for the configuration the crane is set up in.
Our crane is set up at 50 meters and at the moment it is in 2 part meaning that 2 cables go to the hook block, this crane allows for 2 part and four part (the different configurations allow for different mechenical advantage and alter the lifting capacity of the crane)
From the load chart we know we can lift 1300kgs at 50 meters (the furtherest point) Care must be taken to allow for the weight of the lifting chains and the crane cable weight.
Whilst there are indicators on the control pannel on the crane that tell you how much lifting capacity you have it is important to know the chart as you do not want to pick up a load within capacity and not be able to land it in the required spot due to it being out of lifting capacity.
Today the mast of the tower crane was inspected, this is a period inspection that is done when the crane is installed and usually when the crane has its 3 month service. The pins below are called spigots and they lock in the mast sections to each other. A quick visual inspection is given to make sure the spigots are not bent and are in the correct position. Manitowoc has issued a safety alert as these spigots have failed in the past due to inadequate heat treatment, for more information see http://www.cfmeu.asn.au/ohs/alerts/manitowoc-cranes-potain-tower-cranes-safety-alert
In our case today all the pins were fine and it was work as usual
Occasionally the nuts in the tower crane come loose, this is due to the large ammounts of flex in the metal and continual movement. It is essential that they are kept at the required tension and retightened where required.
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