I tried to look up the crane signals, unfortunately they were hard to find so as a favor to everyone I have re-posted them here. Interestingly there is no universal signals as signals in USA and UK differ from Australia's crane signaling. From personal experience I dont mind hand signals provided there is a clear line of sight but am not a big fan of the whistles. It is hard to communicate the crane speed required by the dogman when just using whistles and it is easy to mix up signals. Another problem is that building sites are generally noisy, combined with usually being on a main road and a noisy diesel crane as well as guys whistling at the girls walking by it can get frustrating when given whistle signals. :-/
If you are going for your dogging ticket, here is the dogging guide. Its a good idea to give it a read before doing the course so you get a better understanding of what it is you are learning.
unfabricated hot rolled steel straight from bluescope steel pt Kembla
Today I visited a structural steel fabrication yard and took photos of the process of making structural steel that is delivered to a construction site. Structural steel is used mostly in columns and beams to support the building structure, where there is a cantilever there is often a steel truss used to support and transfer the weight.
above we can see the steel how it arrives from the manufacturer, these steel sections were made in the smelter at Pt Kembla, just near Wollongong. In the photo we have an rolled steel joist aka I beam, round hollow sections, angles and channels.
steel plate of various sizes
Here are steel plates before they are added to the steel sections. These raw materials are what the structural steel will be made from. A team of workers - machinists, trade assistants and painters are given drawings (not so much the painters) to make up the required pieces of steel. The will have to cut, drill and weld to make the steel that is required on the building site
keep up the good work!
Here a welder places some cleats onto a beam whilst a TA drills some holes into another beam. These holes are for bolts to attach another piece of steel.
B is for Beam not Bunnings
The steel is marked or stamped with a letter and number combination. B for beam and 131 the piece, this will correspond with working drawing used on site by the rigging team and with this information they will position the steel in the correct location
The steel once fabricated can be sent to site or if required coated with primer and paint or galvanized. Whatever the client requires.
Here fabricated steel in placed on a trolley. It is wheeled into a sealed spray boot where painters will do their magic.
The finished painted steel is loaded up onto a truck trailer, from here it will be delivered to the construction site.
This morning the guys from TCS came to site to take down the Potain MC85 tower crane. This tower crane stood at 50 meters tall with a 50 meter jib. I will go through the removal process.
6-7am. 300 tonne capacity Grove Mobile crane arrives along with riggers and dogmen, safety talks conducted and JSA filled out. Area is fenced off to stop entry from the public.
By 740 the mobile crane is set up, the riggers fix the fly jib to get the extra reach required to take down the tower crane
We have begun removing the counter weights, the smaller ones weigh 2.9 tonnes and the larger ones weigh 3.4 tonnes. Three counter weights are taken out, leaving one 3.4 tonne weigh remaining to balance the jib weight
The counterweights are placed on the trucks that have arrived in the car park to be loaded up. Once the counterweight lands it has to be laid flat, this requires the skills of the crane operator and rigging crew.
From here on the hard part is out of the way, one rigger hooks up the 10 meter tower sections and gets the mobile crane to take a little bit of weight, the other rigger knocks out the pins that connect the tower sections together. Once the pins are removed the mobile lifts the tower section to the car park and it is loaded onto the trucks.
Whilst waiting for the riggers dismantling the tower the mobile crane will do lifts in the car park where the other riggers are taking appart the 50 meter jib into smaller pieces and loading them onto the truck
Thats pretty much it, the trucks are loaded and delivered to the builders yard where they will be unloaded and stored until they are required again. The mobile crane then packs up and the tower crane is but a memory.
The whole this was finished just a little bit after midday
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