This article includes photos of large Liebherr mobile cranes.
I let these notes set as a draft too long because the 11200-9.1 is no longer the largest. They now have 10-axle cranes. Actually, "largest" is probably like steam locomotives --- it depends on how you measure. The Liebherr may have fewer axles, but I think it still has the longest boom.
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| John W. Coke posted The Most Powerful Mobile Crane in the World… and actually a monster of a truck. Meet Liebherr LTM 11200-9.1 – Built by the German company Liebherr Group, this colossal mobile crane has the longest telescopic boom in the world – 100 meters (328 ft)! Dennis DeBruler Thanks for the confirmation that this 9-axle crane is the worlds largest. [Note how the wheels turn more the further they are away from the center. ] |
I let these notes set as a draft too long because the 11200-9.1 is no longer the largest. They now have 10-axle cranes. Actually, "largest" is probably like steam locomotives --- it depends on how you measure. The Liebherr may have fewer axles, but I think it still has the longest boom.
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| safe_image for World’s Largest All Terrain Crane The implied 6:28 video The last crane in the video, QAY2000, has a 2000 ton capacity and 12 axles. |
But this one is still a bigone.
The telescopic boom is 100m and a lattice jib of up to 126m can be added. It can hold 202 tonnes of counter weights and its maximum driving speed is 75km/h (47mph). In addition to a massive boom, it has "Y telescopic boom guying" (Y-suspender) to significantly increase the load capacity. It can lift 1200 tonnes @ 2.5m. [Liebherr] "The LTM 11200-9.1 is both the the strongest and tallest telescopic crane in the world, lifting up to 1,200 tons (that's 2,645,000 pounds or 12 adult Blue Whales, depending on who's counting). Its eight-part telescoping boom extends up to 328 feet (50 feet taller than the last record holder) and, with the addition of a lattice jib, has a maximum lift height of 630 feet, more than 50 stories high! Though, despite its 445,000 pounds of counter-weight, when the LTM 11200 is picking up 2 million+ pounds, it can only extend about eight feet laterally without tipping." [gizmodo]
The orange truck and trailer in the above photo is used to carry the boom separately when it travels on a highway. More on that later.
An example of it being used with a luffer jib for extended radius.
They do offer a "wind tip." That is, a fixed jib with an angle to keep the rotor assembly away from the boom but still maintain a small radius. But we see an example where one operator just lifts the rotor with a straight boom.
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| John W. Coke posted |
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John W. Coke shared
9 axles from the other side
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| Liebherr |
An example of it being used with a luffer jib for extended radius.
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| Liebherr |
An example of using a luffer jib for height and boom clearance.
Heavy lift configuration
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| Liebherr |
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| Liebherr |
An example of when I don't know why they are using a luffer since it makes assembly more complicated.
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| Liebherr |
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| Gerardo Pergamo posted |
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| Liebherr PDF, p 9 |
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| Liebherr PDF, p 14 |
Watch at least the first part of this video (until 1:40) where they mount the boom on the base unit before watching the next video. The next part (until 5:21) where they add the counterweights is also applicable to the next video.
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(new window) Fortunately, the video is a lot better than their thumbnail. I don't understand German, but the above animation teaches me what they are doing. The reason I recommend watching the first part of the above video is that this video uses the current fad of a bunch of short closeups, including worker's faces. I would have no clue what was happening without the context provided by the above video. This video does teach me that the Y-suspender frame is also transported separately and added after the boom is added. Unfortunately, they quit before showing the boom being extended.
(new window) A LTM 11200 lifting a blade. When a crane is this big, you also need to walk away from the object to get an overview shot. That must be a big wind turbine if they are assembling the rotor in the air with such a big crane. I wonder how the load chart for this crane compares to the Manitowoc MLC 650.
(new window) This video answers my question about moving from one tower to another in a wind turbine farm. That is when the crawlers in America have their accidents. (That is, they fall over!) Obviously, they retract the boom before moving. That is one of the main advantages of using a telescopic boom. Some crawlers move with the boom still way up in the air giving them a high center of gravity. They do remove the block and counterweights. But they leave the counterweight plate on. That is why they almost did not clear a couple of fence gate posts. Significantly, they build a good road for the crane to drive on. If American contractors did that, fewer crawler cranes would tip over. Some contractors won't even lay mats on farm fields in front of the crawler.
(new window) The crane at the beginning of this video is just a helper crane. We first see the 11200 when it is lifting a blade. This video also shows a move between towers. Fortunately, the video uses time lapse when appropriate. Again, the contractor prepares a good road between the towers and the wind turbine must be big because the rotor is assembled in the air.
(new window) Even though removing the boom is very similar to adding a boom, I include this because it is more detailed. It shows they have to use some muscle power to swing the support arms out. But then they hook up a portable hydraulic pump and everything else is done with hydraulic power. Even the pin that hooks the big lift ram to the boom is moved hydraulically. At 12:24 we see a demonstration of crab-mode steering. And when it goes straight again, we see some of the tires are spinning.
At 9:14, I decided that when it is break time they turn off the hydraulic pump and leave the poor videographer to figure out how to kill time. Once again, the crane was used to build a wind turbine farm.
Another disassembly video. At 4:02 it shows a boom dolly being loaded, which is a scene that was missed in the above video. At 7:19 it shows a flatbed trailer with a lot of axles because it is carrying counterweights. It also has a big tool box and a SUV. And I think the thing on the back is the hydraulic pump used to operate the outriggers of the boom.
(new window) Many scenes of this Liebherr LTM 11200 have wind turbines in the background. (Using a love song as the background music is a rather bizarre choice. I like cranes, but I don't love them.) They never do show the final assembly!
https://www.youtube.com/watch?v=vTN40Ng5GE4 raising a boom with luffer to a low jack-knife position
https://youtu.be/SKY4qrTZb3s assembling the luffer jib joint and Y-suspender, another wind turbine farm job 13:41 is the first time I have seen a mobile crane "walk" with a load. In this case the four outrigger pads are up as it repositions to lift the next segment of the luffer boom. I'm sure that it is important that the load is positioned along the long axis of the truck since the outriggers are up. At 14:32 we see a crane with a luffer jib being operated with three segments of the boom extended.
(new window)
(new window) Fortunately, the video is a lot better than their thumbnail. I don't understand German, but the above animation teaches me what they are doing. The reason I recommend watching the first part of the above video is that this video uses the current fad of a bunch of short closeups, including worker's faces. I would have no clue what was happening without the context provided by the above video. This video does teach me that the Y-suspender frame is also transported separately and added after the boom is added. Unfortunately, they quit before showing the boom being extended.
(new window) A LTM 11200 lifting a blade. When a crane is this big, you also need to walk away from the object to get an overview shot. That must be a big wind turbine if they are assembling the rotor in the air with such a big crane. I wonder how the load chart for this crane compares to the Manitowoc MLC 650.
(new window) This video answers my question about moving from one tower to another in a wind turbine farm. That is when the crawlers in America have their accidents. (That is, they fall over!) Obviously, they retract the boom before moving. That is one of the main advantages of using a telescopic boom. Some crawlers move with the boom still way up in the air giving them a high center of gravity. They do remove the block and counterweights. But they leave the counterweight plate on. That is why they almost did not clear a couple of fence gate posts. Significantly, they build a good road for the crane to drive on. If American contractors did that, fewer crawler cranes would tip over. Some contractors won't even lay mats on farm fields in front of the crawler.
(new window) The crane at the beginning of this video is just a helper crane. We first see the 11200 when it is lifting a blade. This video also shows a move between towers. Fortunately, the video uses time lapse when appropriate. Again, the contractor prepares a good road between the towers and the wind turbine must be big because the rotor is assembled in the air.
(new window) Even though removing the boom is very similar to adding a boom, I include this because it is more detailed. It shows they have to use some muscle power to swing the support arms out. But then they hook up a portable hydraulic pump and everything else is done with hydraulic power. Even the pin that hooks the big lift ram to the boom is moved hydraulically. At 12:24 we see a demonstration of crab-mode steering. And when it goes straight again, we see some of the tires are spinning.
At 9:14, I decided that when it is break time they turn off the hydraulic pump and leave the poor videographer to figure out how to kill time. Once again, the crane was used to build a wind turbine farm.
Another disassembly video. At 4:02 it shows a boom dolly being loaded, which is a scene that was missed in the above video. At 7:19 it shows a flatbed trailer with a lot of axles because it is carrying counterweights. It also has a big tool box and a SUV. And I think the thing on the back is the hydraulic pump used to operate the outriggers of the boom.
(new window) Many scenes of this Liebherr LTM 11200 have wind turbines in the background. (Using a love song as the background music is a rather bizarre choice. I like cranes, but I don't love them.) They never do show the final assembly!
https://www.youtube.com/watch?v=vTN40Ng5GE4 raising a boom with luffer to a low jack-knife position
https://youtu.be/SKY4qrTZb3s assembling the luffer jib joint and Y-suspender, another wind turbine farm job 13:41 is the first time I have seen a mobile crane "walk" with a load. In this case the four outrigger pads are up as it repositions to lift the next segment of the luffer boom. I'm sure that it is important that the load is positioned along the long axis of the truck since the outriggers are up. At 14:32 we see a crane with a luffer jib being operated with three segments of the boom extended.
The first photo is a Chinese XCMG crane, similar in size and arrangement to the Liebherr crane.
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