The Kroll K10000 is considered the worlds largest tower crane (note the service crane positioned above the tower crane mast has a lifting capacity of 20 tonnes)
It is debatable wether it is the biggest lifter when compared to the Favco M2480D, a custom made luffing crane made by Favelle Favco for Marr contracting.
The Favco M2480D has a max lift of 330 tonnes up to 15 meters working radius, its capacity at 100 meters is 25 tonnes.
It is currently working on the Barangaroo construction site on Sydney harbour.
The Kroll K10000 has a maximum lift of 240 tonnes up to 44 meter radius (this is a superlift, under this configuration the cranes trolley will not work, allowing only for slewing, lifting and lowering) its capacity at 100 meters radius is 94 tonnes
The reason for the larger lifts up close for the M2480D is luffing cranes design more efficiently transfers the weight of the load and the cranes jib through to the cranes tower.
Unlike most tower cranes the K10000 slew ring is at the base of the crane, meaning the jib does not slew, the tower / mast of the crane slews. This allows weight to always be evenly distributed on tow of the tower corners.
The K10000 is fitted with an access elevator removing the climb an operator has to do to reach his cabin
Whilst the M2480D is often used on construction projects, the K10000 is more limited to industrial projects such as shipyards and power plants. A single K10000 requires in excess of 50 trucks to be transported.
*Both the K10000 and M2480 are made by Favelle Favco group, who acquired Kroll cranes in 1997
Biglift Cranes Sydney has recently aquired the Tadano TR 160 mobile crane.
The mobile crane has a maximum lifting capacity of 16 tonnes at 6.5 meters and can lift 400 kgs at 22 meters maximum radius
This smaller crane has the advantage of being quick to set up, is a rough terrain crane and due to its size it can fit into places other mobile cranes cannot. It is very cost effective being one the the cheapest cranes you can hire in Sydney.
Perfect for small jobs such as moving a container or portable building, lifting ducting or air-conditioning onto a roof, moving materials around site, steel erection on smaller projects. This crane is also often used for people living in apartments that cannot get furniture or materials through the lift shaft or stairs with the crane able to lift straight up to the level required.
If you are in Sydney and require mobile crane rental call Biglift Cranes on 1300 024 454 to discuss pricing and whether this crane is right for your project. Mention you found Biglift through the blog for a 5% discount
This is the 8 tonne Terex tower crane in a series of flat top tower cranes that range from 1.5 tonne to 40 tonne. The CTT 162 is set up with maximum jib length of 65 meters and can lift 1.5 tonnes at max radius. I believe the cut out limits have been set up too high on this crane as it doesnt lift what it should be able to according to the load chart.
Previously we have reviewed the 5 tonne Terex CTT121. This crane suffers from the same main problem as the 5 tonne crane in the range which is reliability.
Ill go through all the issues I have with this crane, they are as follows
Weak slew motors- The slew motors could be bigger. It takes a while to build up speed slewing and a lot to slow down. Made even worse by the fact that backslewing on this crane does absolutly nothing. If you overslew, the crane wont let you slew back until slew has come to a compete stop and rested. And wind really affects the slewing, if you have a tail wind the slew will take so much longer to pull up, you really have to keep an eye not just on wind speed but also wind direction.
Play in slew brake- When the slew brake is engaged the cranes jib has a bit of movement, when windy the jib rocks back and forth when locked, requiring the operator to keep catching swing even when crane is stationary.
Slew brake engagement- The slew brake isnt wired up to thumb buttons on this cranes levers but on a button to the left of the slew/trolley level. To engage the slew brake requires taking the hand off the lever completly or waiting for the slew brake to automatically engage. When operating in windy conditions this is a problem.
Radius on control pannel- For some reason the radius reading is not 100% accurate. On a known spot the radius reading can change by 1.5 meters. Not a big deal but just remember you cannot reley 100% on the radius given to you on the display.
Small cramped cabin- Wow the cabin is tiny. Im not that tall and it is cramped in there. Getting past the chair to sit down or get out is awkward, requiring swivelling of the chair and squeezing through. The air con is average and noisy. Although in wither the plus is that it has a great heater. I much prefer to be on the ground dogging this crane than being cramped up in the cabin all day.
Unreliable- The tower crane is only 6 years old yet it seems every month we have to get the rental company out to fix something on the crane. We have had problems with the hoist motor failing, the way cable spools on the drum and the trolley so far.
Hoist speed could be faster- For this job which is only 6 storeys high the hoist speed is fine but on something higher the crane would let you down.
Trolley cuts out when overloaded- If you reach 100% capacity not only will the tower crane not hoist up but trolley is completly disabled. Even after taking the weight off the crane trolley is still disabled, requiring you to reset the crane (turn off then on). Most tower cranes will allow trolley in when overloaded, allowing the operator to trolley in and increase the working load limit and then hook up. The way this crane works with the trolley cut out is a nusance.
This is not the worst 8 tonne tower crane I have experienced, but it is still below average. There are better tower cranes out there and if possible go with something else, especially if you cannot afford downtime due to this cranes unreliability. Ill give this crane 2 out of 5 stars!
The lifting chains on the crane can become stretched by shock loading, lifting beyond the chains capacity and uneven weight distribution from load to chains causing overloading.
A bit of stretch in the chain is ok but once you get to 10% stretching in a single link the chains must be taken out of service and replaced.
For example if a link that is 30mm long when new and is now 33mm long or more that chains must be replaced, below 33mm is ok but keep on checking regularly especially if they have started to stretch.
You can see stretched chains straight away because 99% of the time they dont stretch evenly.
Deflection is a problem as it changes the radius of the crane. Luffing tower cranes and lattice boom mobile cranes are less susceptible to deflection than hammerhead tower cranes and telescopic boom mobile cranes, flat top tower cranes perform worse than tower cranes with an A frame. Although deflection will vary amongst brands and models.
Other things influencing deflection levels are the tower height (the higher the tower the more deflection) whether the crane is tied in to a structure or free standing and working radius (the higher the working radius the more deflection) and the weight being lifted (more weight = more deflection)
The most common objects to cause deflection on a construction site are
Bobcats and excavators - 3t plus
Stressing cable - 3t
Precast concrete - 3t to 10t generally
When lifting with deflection the cranes tower will start to lean towards the object being lifted. Although when hooking up the load the dogman has positioned the hook block above the load, now due to deflection the hook block will be further out than the load, causing the load to swing and potentially damaging objects and structures in close proximity or even causing injury.
To rectify this the dogman should keep an eye out of the position of the cranes hook block and trolley and adjust the radius if effected by trolleying in to the centre of the load again or jibbing up if on a luffing crane.
Demolition is a dirty, dangerous job. I did it once for a week before I quit and I hated it. Lots of manual back breaking work, dust and occasionally asbestos etc l. Hate it!!!
Lucky the crane crew comes in after the demo work is done, usually as the excavation team is just finishing up.
In the states and other countries however they allow 'wrecking balls' which are banned for use in Australia :(
It looks like great fun (Im kinda jealous) but what can you do.
You do need a much higher capacity crane than just the wrecking ball weight to allow for the swings which would move the working radius all over the place.
Most demo work in Australia is done by long reach excavator after labourers strip the building of asbestos and recyclable goods such as hard wood and copper.
For further information on demolition check out HBrown its a good read and the various methods available.
Remember the 50 cubic meter concrete pad that was installed on the construction site?
Well now it is ready for its job as a tower crane base. A 6t Liebherr 100 LC tower crane will be installed.
A team of riggers from Morrow have the task of putting up the crane. Using a 100t Liebherr mobile crane and 20 tonne Terex franna crane from Gillespies Cranes.
It was an early start for the team, trucks with tower sections and the mobile crane were there when I arrived at 630am. The tower crane sections kept arriving all day. The 100t mobile crane has the task of building the crane whilst the franna crane does some lifting off the truck and helps with dual lifts to re position tower sections and counterweights.
At the start of the day the mobile crane sets up, the bigger the mobile the longer the set up, this one took about 40 minutes to set up. The mobile crane operator has a major role, as every piece of the tower crane has to be installed with this mobile.
The base tower section is being lifted off the truck, the bolts in the concrete pad will attach to the bottom of this tower section, securing it to the ground
The rigger bolts the tower section to the pad. The nuts on the bolts must be tightened with a hydraulic torque wrench to get them to the required torque.
The riggers set up a frame to work from whilst they are bolting the tower sections together. Although they are not always used, they make it easier and safer when connecting and bolting the tower sections together.
Tower sections keep being installed, the tower sections connect together and all up will reach 50 meters on this crane.
Now that the towers have all been installed its onto the next step, the A frame. On a flat top tower crane there is no A frame to install, making for quicker installation
Up goes the crane cabin, it will attach to the slewing assembly. As the crane is operated the cabin rotates with the cranes jib.
The counter jib is installed. This will hold the counterweights that balance the cranes jib and loads it lifts as well as house the electrical power board for the crane and computer for remote control operation.
Before the jib is installed, some counterweights are installed. Its very important to put the exact amount of counterweight in before putting on the jib. Too much can tip the crane in the counterjib direction. To little can tip the crane in the jib direction. Remember the purpose of the counterweights is not just to balance the loads the crane lifts but also the weight of the actual crane.
The jib is transported in pieces as its too big to travel as a single piece. When it arrives it is assembled on the ground before it is raised an in this case assembled to the crane in two pieces
first piece of the Jib is installed then the pendant that attaches to the A frame is installed
Trolley being connected to the tower crane jib, this moves up and down the jib and along with the slew and hoist control the movement of the hook block and the loads hooked up to the block.
The second part of the jib is installed
Now the counterweights go in. They simply drop into the counter jib, a steel pin running through the counterweight keeps them from dropping to the ground.
That's the fun stuff over. The rest of the install is quite slow. Now the hoist and trolley cables have to be run out as well as electrical cable that will run up to the power board on the counter jib. A specialised electrician will wire it up, the electricians used usually only do tower cranes and often have a background in plant and machinery if they didn't first start on tower cranes.
The crane is installed, before the builder can use the crane the crane must be calibrated. Limits are set on the crane to ensure that it wont lift in excess of its capacity and damage or tip the crane. The crane operator is inducted by someone from the rental company on the operation and basic maintenance of the crane.
After reading this article you may want to have a look at the tower crane anatomy for a better understanding of the parts that make up the tower crane and what they do.
Column Climbers are an attachment you strap to your boots to allow you to climb steel I beams. I have never seen them in use in Australia as of yet, but they look pretty neat. Not as useful as a scissor lift but much cheaper and a better option than a ladder in my opinion.
They cannot be used on the round hollow section columns or square hollow sections as they need to hook into the flange of the I beam.
Anyone with any experience with the product happy to hear what you think of them.
Today we review the Cattano CM371 4 tonne self erecting tower crane. This is an Italian made crane with a 37 meter jib.
There were a few issues that may prejudice my review. The crane was poorly maintained by the crane hire company. When it was erected the hoist rope was completely grease free and they didn't even bother earthing the crane, they didn't bother calibrating the crane for weights, radius, hook height, deflection etc. so the screen on the remote was completely useless.
The crane was too small for the site, it only reached half the site. The site manager quit half way through this job, and the last thing he said to me was 'when I saw the crane they got for this site I should not have joined the company' haha!
It really was the wrong crane for this job, every trade would ask... 'why did they get such a small crane' my reply was always different... 'because it was on special' 'it was the only crane they could get' and other stupid replies
The crane can lift 4 tonne in 4 part and drops to 1 tonne at 37 meter max radius though the 1 tonne was more like 800kg and had to be lifted in 1st gear. If the load was too heavy the hoist up and trolley out were disabled, like most other cranes.
Changing from 2 to 4 part and back was by taking weight off the big block and droping the small block and pinning together or unpinning (although after a while the small block wouldn't drop, causing the hoist rope to spool everywhere, it was a mission getting it back on)
These small cranes are quite reactive and easy to operate but there was a problem with the slew brake, it was always on, the second you stop slewing it would stop you and make the crane a bit jerky. The free slew was different to every other crane, it has an in service / out of service lever on the base of the crane... it did nothing though, every night I would park the crane in the same spot and no matter how windy it would always be in the same spot every morning. The hoist was painfully slow, even for a self erecting tower crane. The Potain HD40 is faster in 4 part setup than this crane is in 2 part.
The jib must of been slightly bent because at about 30 meters radius it made a horrible sound when trolleying... every single time!
The weird thing was that with all its faults the crane never actually broke down to where we had to stop working, we actually kept working when other cranes stopped because this crane goes really well in the wind which usually isn't the case for self erectors.
Maybe its impossible to give this crane a completely honest review as my experience was so badly tainted. At the end of this job I told my employer I could no longer work operating self erecting tower cranes.
It was a terrible choice of crane for the job
The builder didn't know the go
The crane hire company just didn't care
I'm giving this crane 2 stars out of 5
Previously we looked at static tower crane bases, however the most common tower crane base is a concrete pad with anchor bolts cast into the pad.
The process for making this crane base starts with the engineer. The engineer specifies the size of concrete pad and dimensions required, steel reinforcing and concrete strength. This varies depending on soil type (clay requires a bigger pad, sandstone and rock much smaller) free standing or ties in (free standing requires a bigger pad) the use of rock anchors (anchors can reduce the pad size required) and if the pad is in ground or only partially in ground or above ground (in ground is best)
This concrete pad was constructed for a 6 tonne Liebherr tower crane with a 50 meter jib.
Although the crane is fairly small, and the pad is on sandstone it required a huge pad.
A total of 50 cubic meters of 65 MPa concrete was used to make this pad.
The reason for the large pad was that it is not in ground but above ground and only supported by two sides. A much larger and more expensive option than a pad in ground, if pad in ground were used it would also of eliminated the need for using form work.
Knowlegable readers are probally wondering why 65 MPa concrete was used. The reason being the builder postponed building the pad untill a week before the crane was due to be erected. The engineer specified the concrete must be minimum 38 MPa. Concrete takes 28 days generally to reach its specified MPa. By using 65 MPa concrete it could reach 38 MPa (which it did) in one week not one month as would of been the case with 38 MPa.
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