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  #801  
Old Posted Feb 28, 2016, 7:03 AM
officedweller officedweller is offline
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Seems like a lot of cross-bracing on that new crane segment.
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  #802  
Old Posted Feb 28, 2016, 9:51 AM
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Ya gotta love the complexity. Some poor team of engineers spent a lot of time detailing all that steel bar, and soon it will be forever invisible. I love going out for site inspections with these guys: their work sometimes meets the standard for beautiful. Same goes for checking their drawings against the architectural. Large scale engineering design is artful, but so is the small scale.

Still waiting to see the transitional steel (from the anchor to the vertical - both for the compression and the tensile components).

Its going to be a big volume, big time pour.
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  #803  
Old Posted Mar 2, 2016, 1:35 AM
Regina14 Regina14 is offline
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That is the top portion of the internal climber. The area with the extra struts, is where the top collar will be placed.
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  #804  
Old Posted Mar 2, 2016, 9:31 AM
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Originally Posted by Regina14 View Post
That is the top portion of the internal climber. The area with the extra struts, is where the top collar will be placed.
Please don't take this badly, but this is a general forum of enthusiasts, not professionals. It would be helpful if you could restate your post in simple language. I know it’s good sometimes to use the professional terminology, but it can also get in the way. I know that on my projects, during general meetings where all sorts of consultants are present, I ask the engineers to describe things in normal (if perhaps sophisticated) language so everyone can understand what is important. All of the engineers I work with are more than happy to do this because they really like everyone else to see what they are trying to do. Things only get technical when necessary: when the numbers, element sizing, material grades and specific components need to be discussed so all the different drawing sets will align and the contracting/procurement side of things can get going.

I wouldn't usually bring all this up, but this structure is going to be very interesting to witness and it would be good if everyone could follow along (including me). You obviously have some worthy insights to share.

I haven't see a foundation this interesting since a 12 story condo tower went up in Toronto with most of its foundation constructed beneath the 12 story building next door. The whole thing was cantilevered and the rebar/formwork was crazy. I never did find out what was up in terms of the division of properties, etc. That was 20+ years ago.
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  #805  
Old Posted Mar 2, 2016, 5:39 PM
Regina14 Regina14 is offline
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Originally Posted by Marshal View Post
Please don't take this badly, but this is a general forum of enthusiasts, not professionals. It would be helpful if you could restate your post in simple language. I know it’s good sometimes to use the professional terminology, but it can also get in the way. I know that on my projects, during general meetings where all sorts of consultants are present, I ask the engineers to describe things in normal (if perhaps sophisticated) language so everyone can understand what is important. All of the engineers I work with are more than happy to do this because they really like everyone else to see what they are trying to do. Things only get technical when necessary: when the numbers, element sizing, material grades and specific components need to be discussed so all the different drawing sets will align and the contracting/procurement side of things can get going.

I wouldn't usually bring all this up, but this structure is going to be very interesting to witness and it would be good if everyone could follow along (including me). You obviously have some worthy insights to share.

I haven't see a foundation this interesting since a 12 story condo tower went up in Toronto with most of its foundation constructed beneath the 12 story building next door. The whole thing was cantilevered and the rebar/formwork was crazy. I never did find out what was up in terms of the division of properties, etc. That was 20+ years ago.
There isn't a simpler way to put it. Nothing was technical about my language. I understand if you don't know what an internal climber is, but I'm having a hard time understanding why you couldn't do a simple Google search of "internal climber". This is the very first link that comes up. As I'm sure you can see from the video, explaing that procedure would have taken far too long and frankly very difficult to someone who has never witnessed the process and has no knowledge of what individual parts are called, tehnical or not.
https://m.youtube.com/watch?v=t8I3Is5J-wE

The 3rd tower section installed in the video would be the equivalent to the section that has been used on this site to set the base. When the erection crew returns when the base has been poured, they will pull that current section off and replace it with the bottom section of the climber which contains the hydraulic ram that will push the crane up through the collars that will be placed on the slabs above it as the building progresses.

Last edited by Regina14; Mar 2, 2016 at 7:13 PM.
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  #806  
Old Posted Mar 2, 2016, 6:22 PM
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logan5 logan5 is offline
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Originally Posted by Regina14 View Post
There isn't a simpler way to put it. Nothing was technical about my language. I understand if you don't know what an internal climber is, but I'm having a hard time understanding why you couldn't do a simple a Google search of "internal climber". This is the very first link that comes up. As I'm sure you can see from the video, explaing that procedure would have taken far too long and frankly very difficult to someone who has never witnessed the process and has no knowledge of what individual parts are called, tehnical or not.
https://m.youtube.com/watch?v=t8I3Is5J-wE

The 3rd tower section installed in the video would be the equivalent to the section that has been used on this site to set the base. When the erection crew returns when the base has been poured, they will pull that current section off and replace it with the bottom section of the climber which contains the hydraulic ram that will push the crane up through the collars that will be placed on the slabs above it as the building progresses.
By collar, do you mean the struts that are attached between the crane and the slab floor? "Collar" doesn't seem like the right word to describe such a set-up.

Also, hydraulic ram suggests that the crane will be forced upwards by a giant hammer...
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  #807  
Old Posted Mar 2, 2016, 8:53 PM
jollyburger jollyburger is offline
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Hydraulic ram?



Terminology aside it will be fun to just sit back and watch.
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  #808  
Old Posted Mar 2, 2016, 11:03 PM
Marshal Marshal is offline
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Quote:
Originally Posted by Regina14 View Post
There isn't a simpler way to put it. Nothing was technical about my language. I understand if you don't know what an internal climber is, but I'm having a hard time understanding why you couldn't do a simple Google search of "internal climber". This is the very first link that comes up. As I'm sure you can see from the video, explaing that procedure would have taken far too long and frankly very difficult to someone who has never witnessed the process and has no knowledge of what individual parts are called, tehnical or not.
https://m.youtube.com/watch?v=t8I3Is5J-wE

The 3rd tower section installed in the video would be the equivalent to the section that has been used on this site to set the base. When the erection crew returns when the base has been poured, they will pull that current section off and replace it with the bottom section of the climber which contains the hydraulic ram that will push the crane up through the collars that will be placed on the slabs above it as the building progresses.
I work directly in this field and know what you are saying. I don't need to Google anything. But most of the rest of us don't, and the thread simply works better without having to Google/research what everyone is saying.

It's not about saying things "more simply" but simply using language that produces a clear description. Your second paragraph is what i am talking about. It describes things and hits the right note concerning the base level of knowledge appropriate here.

Most people here know the basics about how tower cranes work. Most everyone knows about cranes that get hydraulically pushed up as the structure rises. So that doesn't need explaining. You could have just noted that and then pointed out the parts of it you can see in the photos. That's it. And you basically did that. So, that's all.

Please know, I'm not picking on you. And while it is off topic, I thought it might be of interest to some. Architecture/buildings/construction comes from a lot of complexity, including consultants sometimes working at cross purposes. The management of it, typically governed by the architect, as prime consultants, is quite interesting. It’s mostly that the needs for effective management of engineering consultants along with all the others on a design team, has made this issue of communication a professional concern of mine. I taught a course at UBC (Civil Engineering) on this. Like I said, professionally, I insist everyone who's trying at all to understand what is happening is able to do so. Very few consultants dislike this being required of them. In fact, almost all really like it . . . I think they really want people outside of their specialization to know what they are trying to achieve. Some have described it as being liberated from their small technical world. For me, it allows more input, resulting in more refined solutions that solve more "interference" (between different building systems) issues before construction begins and things begin to really cost money. Also, my experience is that when I have design meetings alone with engineers, they talk this way anyway. Architects also do this. The higher one goes, the more conceptual the discussion - which means non-technical language. As the higher up work starts to push its way down the organizational ladder, ultimately to the CAD kids producing working drawings, the more technical it all becomes. This is natural and by necessity.

And, a last aside: I raised this question with my son who is a mathematical physicist. His team is working within the weirdness of Quantum Entanglement. Talk about technical language. Nonetheless, he agreed to a point; if you can't explain what you are doing to a lay person such that they can understand, in general, what you are doing, it is likely you yourself are lost in the details and don't know the guiding picture very well yourself. Outside of relatives, it’s obvious he doesn't do this if he can help it. But, he says, it is similar to the situation of a group of diverse building consultants trying to work together while coming from different sets of understanding and concentration. He says, it is quite difficult for many physicists to understand the work done by other physicists, and mathematics is much worse. He showed me this giant encyclopaedia (sort of) of all the hundreds upon hundreds of current mathematical 'working points' and told me it was the reference that allowed mathematicians to talk to each other. The work they do is so specialized, that they have no detailed idea of what all the other mathematicians are doing. Crazy world.

Ok, no more of this and back to structural construction.
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  #809  
Old Posted Mar 3, 2016, 1:36 AM
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This is a fascinating project; I'm so happy that the bridge affords a great unobstructed view down into the pit.

Regarding complex rebar, the Spectrum towers still take the cake for me. Four 30-ish storey towers sitting on top of a Costco retail space with significant clear span areas. The rebar they used for Spectrum's mighty transfer slab looked more like fence posts or small trees.

Here's the only photo of any quality that I could find, and it just shows the columns before the transfer slab was rebar'd up. Also, BC Place was so dingy; I forgot how mildewed accrued.


Source: https://www.flickr.com/photos/vancouverbyte/870429147
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  #810  
Old Posted Mar 3, 2016, 4:06 AM
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Klazu Klazu is offline
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Can't wait to see two red cranes swinging around an ever-taller tower. This project will be so interesting to follow!
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  #811  
Old Posted Mar 3, 2016, 4:43 AM
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Originally Posted by SFUVancouver View Post
This is a fascinating project; I'm so happy that the bridge affords a great unobstructed view down into the pit.

Regarding complex rebar, the Spectrum towers still take the cake for me. Four 30-ish storey towers sitting on top of a Costco retail space with significant clear span areas. The rebar they used for Spectrum's mighty transfer slab looked more like fence posts or small trees.

Here's the only photo of any quality that I could find, and it just shows the columns before the transfer slab was rebar'd up. Also, BC Place was so dingy; I forgot how mildewed accrued.


Source: https://www.flickr.com/photos/vancouverbyte/870429147
Yes, I remember that. The diameter of the steel can get pretty big. Also, the density of the pattern sometimes makes it a mystery how little of the cross section is concrete and how that concrete actually fills up all the voids. We all know how it works and how modern placement techniques work, but visually it just hits you how amazing it can be. The four central columns in your picture are an example. It always hits me when I get up close; always have to reach out and touch it.
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  #812  
Old Posted Mar 3, 2016, 4:46 AM
Marshal Marshal is offline
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Originally Posted by Klazu View Post
Can't wait to see two red cranes swinging around an ever-taller tower. This project will be so interesting to follow!
Could be more than two to cover all the low-rise elements, no?
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  #813  
Old Posted Mar 3, 2016, 7:27 AM
Regina14 Regina14 is offline
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Originally Posted by Marshal View Post
I work directly in this field and know what you are saying. I don't need to Google anything. But most of the rest of us don't, and the thread simply works better without having to Google/research what everyone is saying.

It's not about saying things "more simply" but simply using language that produces a clear description. Your second paragraph is what i am talking about. It describes things and hits the right note concerning the base level of knowledge appropriate here.

Most people here know the basics about how tower cranes work. Most everyone knows about cranes that get hydraulically pushed up as the structure rises. So that doesn't need explaining. You could have just noted that and then pointed out the parts of it you can see in the photos. That's it. And you basically did that. So, that's all.

Please know, I'm not picking on you. And while it is off topic, I thought it might be of interest to some. Architecture/buildings/construction comes from a lot of complexity, including consultants sometimes working at cross purposes. The management of it, typically governed by the architect, as prime consultants, is quite interesting. It’s mostly that the needs for effective management of engineering consultants along with all the others on a design team, has made this issue of communication a professional concern of mine. I taught a course at UBC (Civil Engineering) on this. Like I said, professionally, I insist everyone who's trying at all to understand what is happening is able to do so. Very few consultants dislike this being required of them. In fact, almost all really like it . . . I think they really want people outside of their specialization to know what they are trying to achieve. Some have described it as being liberated from their small technical world. For me, it allows more input, resulting in more refined solutions that solve more "interference" (between different building systems) issues before construction begins and things begin to really cost money. Also, my experience is that when I have design meetings alone with engineers, they talk this way anyway. Architects also do this. The higher one goes, the more conceptual the discussion - which means non-technical language. As the higher up work starts to push its way down the organizational ladder, ultimately to the CAD kids producing working drawings, the more technical it all becomes. This is natural and by necessity.

And, a last aside: I raised this question with my son who is a mathematical physicist. His team is working within the weirdness of Quantum Entanglement. Talk about technical language. Nonetheless, he agreed to a point; if you can't explain what you are doing to a lay person such that they can understand, in general, what you are doing, it is likely you yourself are lost in the details and don't know the guiding picture very well yourself. Outside of relatives, it’s obvious he doesn't do this if he can help it. But, he says, it is similar to the situation of a group of diverse building consultants trying to work together while coming from different sets of understanding and concentration. He says, it is quite difficult for many physicists to understand the work done by other physicists, and mathematics is much worse. He showed me this giant encyclopaedia (sort of) of all the hundreds upon hundreds of current mathematical 'working points' and told me it was the reference that allowed mathematicians to talk to each other. The work they do is so specialized, that they have no detailed idea of what all the other mathematicians are doing. Crazy world.

Ok, no more of this and back to structural construction.
Let me get this straight. You said...
" It would be helpful if you could restate your post in simple language."
And then you say...
"It's not about saying things "more simply" but simply using language that produces a clear description. Your second paragraph is what i am talking about. It describes things and hits the right note concerning the base level of knowledge appropriate here."
You're contradicting your self here. My second paragraph only makes sense if you have watched the video. So you've kinda made my point there.
If you say most of "you" know the basics of how tower cranes work, than what I said initially should be relativity easy to understand. And if not, then its reasonable to assume that anyone interested enough in construction projects that they're reading forms in their spare time, would likely take the time to "research" or watch a 2min video that clearly shows the process.

Really? You bothered you son about this topic? Do him a favor, practice what you preach "Outside of relatives, it’s obvious he doesn't do this if he can help it." Or did you simply bring that "last aside" up because you wanted to brag about the intelligence of your son?
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  #814  
Old Posted Mar 3, 2016, 7:35 AM
Regina14 Regina14 is offline
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Originally Posted by logan5 View Post
By collar, do you mean the struts that are attached between the crane and the slab floor? "Collar" doesn't seem like the right word to describe such a set-up.

Also, hydraulic ram suggests that the crane will be forced upwards by a giant hammer...
Nope, I meant what I said. Collars go around the tower of the crane, much like a collar goes around a neck. Not sure how that "sounds" like the wrong word.
Not sure how you're making the hammer connection there...
These diagrams should help with your skepticism.

http://www.morrow.com/sites/default/files/images/crane101/tie-in-lg.png
http://www.morrow.com/sites/default/files/images/crane101/top-climbing-unit-lg.png
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  #815  
Old Posted Mar 3, 2016, 7:41 AM
Regina14 Regina14 is offline
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Originally Posted by Marshal View Post
Could be more than two to cover all the low-rise elements, no?
Nope, two luffers. The first one has a 50m reach and the second will have 60m.
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  #816  
Old Posted Mar 3, 2016, 9:12 AM
Marshal Marshal is offline
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Originally Posted by Regina14 View Post
Let me get this straight. You said...
" It would be helpful if you could restate your post in simple language."
And then you say...
"It's not about saying things "more simply" but simply using language that produces a clear description. Your second paragraph is what i am talking about. It describes things and hits the right note concerning the base level of knowledge appropriate here."
You're contradicting your self here. My second paragraph only makes sense if you have watched the video. So you've kinda made my point there.
If you say most of "you" know the basics of how tower cranes work, than what I said initially should be relativity easy to understand. And if not, then its reasonable to assume that anyone interested enough in construction projects that they're reading forms in their spare time, would likely take the time to "research" or watch a 2min video that clearly shows the process.

Really? You bothered you son about this topic? Do him a favor, practice what you preach "Outside of relatives, it’s obvious he doesn't do this if he can help it." Or did you simply bring that "last aside" up because you wanted to brag about the intelligence of your son?
You know, this is not what I wanted. If you want an argument, I'm not interested, so write what you want. I never said you were wrong, I just thought we could discuss it. I think it’s interesting. Oh well.

I think your video link was very good and clearly showed what you were talking about. I'm not going to pick your words apart, like you are doing to mine. I see no advantage in that.

But you just keep getting more aggressive, negative and personal. My son is my son. I talk to him about all sorts of things. I didn't "bother" him about this particular detail. We have simply discussed these kinds of things because it’s interesting to us both.

Your words about myself and my son are out of line. Stop being an asshole. If you don't want to have a discussion, don't. There is no need to take it in this direction. I will discuss whatever I please with my son. Yes he is pretty smart, so what. Lot's of people are pretty smart. Aren't you? He's just a young man doing interesting things which, believe it or not, have some overlaps with our interests here.

Since you are so rightiously defensive of yourself, I think I will just help explain things when it seems appropriate.

I won't reply to you again.
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  #817  
Old Posted Mar 3, 2016, 9:25 AM
Marshal Marshal is offline
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Logan5: Collars are the square frames that are attached to the structure and allow the main tower of the crane to be jacked up to a higher position. The struts are the members which connect the collar to the building/structure. Though, usually struts are used to position a continuous tower on the outside of the rising tower: as was the case with trump tower.

A hydraulic ram is nothing like a giant hammer. Think more along the lines of a hydraulic jack. The movement (they use multiple rams in concert) is very slow and accurate because there is a lot of control. In general, hydraulic rams are used for many things: TBMs are pushed forward by them, buildings being moved are raised by them, large unitary structures are raised and carefully moved into position by them, seamless rail (Skytrain) is assembled (welded) at a single location and then pushed the entire way down the line by them. They can be incredibly powerful and are used all over the place. But, no hammering in it.
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  #818  
Old Posted Mar 3, 2016, 2:30 PM
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Klazu Klazu is offline
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Originally Posted by Regina14 View Post
Nope, two luffers. The first one has a 50m reach and the second will have 60m.
There must be another crane for the low-rise inside the loop? There is no way a crane can be swinging stuff over Granville Bridge ramp traffic.

On that note, how will they eventually disassemble cranes that are located inside a building? Both Shangri-La and Trump had an external crane that could disassemble itself when not needed anymore. Are there mobile cranes that can reach over 150 meters or how do they do it?

Last edited by Klazu; Mar 3, 2016 at 10:43 PM.
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  #819  
Old Posted Mar 3, 2016, 6:09 PM
Regina14 Regina14 is offline
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Originally Posted by Klazu View Post
There must be another crane for the low-rise inside the loop. There is no way a crane can be swinging stuff over Granville Bridge ramp traffic.

On that note, how will they be eventually disassembling the cranes as they will be located inside the building? Both Shangri-La and Trump had an external crane that could disassemble itself. Are there mobile cranes over 150 meters in height to use on the tower is all there or how do they do it?
My bad, I misunderstood. I thought you were referring to the north section of the building that is going ~3 floors and then steps in.

The crane that is currently standing will be top-climbed up along the outside of the building and will be used to take down the other crane. Then it will be climbed down like you would normally see on other external cranes. In other cases of internally climbed cranes, that are too high to be reached by a mobile. They use a crane that is erected on the roof of the building. These cranes are called Derricks. After the tower crane has been dismantled, the Derrick crane can be broken down into pieces small enough to be managed with carts and dollies, and taken down using the elevator. In some cases an even smaller derrick crane is used to lower the larger one.
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  #820  
Old Posted Mar 3, 2016, 10:30 PM
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Originally Posted by Klazu View Post
There must be another crane for the low-rise inside the loop. There is no way a crane can be swinging stuff over Granville Bridge ramp traffic.

On that note, how will they be eventually disassembling the cranes as they will be located inside the building? Both Shangri-La and Trump had an external crane that could disassemble itself. Are there mobile cranes over 150 meters in height to use on the tower is all there or how do they do it?
Yes, top climbing: what regular people call "raised;" either by being raised and having sections added (typical for continuous external cranes), or by being raised within a hole in the floor slabs (obviously the case for internal cranes). Cranes "located inside the building" work like this: the building rises around them with holes formed in the slabs to accommodate them (the tower component) as they go. When needed, the crane is raised hydraulically up through these holes. The holes at the top and bottom of the section have collars which attach the crane to the slabs. The collars hold the crane in position but allow it to move up and down. Two collars hold the crane. A third is added to the top of each section. The crane is raised until the top two collars are holding it, and the bottom one is freed up and removed. It is a process of leap frogging all the way up the construction. As it goes, the holes in the slab left behind as the crane is moved up are filled in. At the end, the crane is simply pushed up through the top as it is taken apart and lowed by a temporary derrick crane. This is a reverse version of firing an arrow with fishing line over a gap, to pull a wire, to pull a rope, to pull a cable, to pull a larger cable, etc.. Here, a smaller crane takes down a larger crane, which is then taken down by hand and lowed down by cables (window washing gantry scale), and with the small bits taken down construction elevators.

There are mobile cranes that reach up to 175m approx. (with extensions), but they are so big you could never get one through our city streets to the site.
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