I mean, yesterday I was walking in the city when I saw a huge crane installed in a field without other buildings or construction near of it. That thing was higher than anything around.
I still can’t understand how they are build. Please help.
In: Engineering
The crane’s base and extensions are driven to the site using trucks. Then the crane basically builds itself at the location.
Here’s a simple video showing this process:
Edit: grammer
Really big cranes tend to be self-assembling.
We have the top of the crane. Below it is a scaffold/climbing section.
This climbing section has a mechanical arrangement that allows it to lift itself to the top of the crane mast, then the crane lifts up another mast segment, the segment is lifted into the scaffold/climbing section, bolted to the mast and then the scaffold uses that section to lift itself even higher.
[Like this](https://www.youtube.com/watch?v=vx5Qt7_ECEE)
Well first we’d have to understand what type of crane it was.
If it was a tower crane, then usually they dig a hole, fill it up with concrete and place big bolts into the concrete that the crane is attached to. They then use a smaller, mobile crane (one that can be moved around easily) to assemble the pieces of the tower crane that are brought in on trucks.
If it was what we call a crawler crane (a crane that sits on tracks or “crawlers”) then all those piece would be brought in on trucks and again assembled using a smaller, mobile crane.
The mobile cranes they use to assemble the bigger cranes are usually what we refer to as truck cranes. These cranes are mounted onto a truck and have a collapsible, or “telescopic” boom. They can be driven from place to place and set up on what are called outriggers to keep them from tipping over. There are also rough terrain or RT cranes that are similar to the truck cranes but don’t usually drive on the road. So, again, they are brought to the jobsites on trucks.
They are like a train that builds their own track, one length at a time as they move up in the sky.
It depends on what kind of crane it is. Some cranes have a large boom that they can lay down on the ground for disassembly and transport and then extend high up in the sky when operating. These are usually quick to set up, just a few minutes. But they have limited strength as the boom needs to carry its own weight as it unfolds so it can not carry a big cab, winches, counterweights, etc on top of the crane. These are commonly known as mobile cranes and can be quite big.
But the biggest cranes that can be temporarily installed are tower cranes. These have a huge tower in the centre with the rotating crane on top containing the boom, cab, winches, counterweights, etc. The crane portion is assembled on the ground. The tower is made up of sections. There are hydraulic jacks that can lift the entire tower one section higher and then this section can be fitted to the tower making it a bit taller. You repeat this process until the tower is high enough.
These are popularly mounted in future elevator shafts of skyrises. As the building is constructed around them the tower can be anchored to the upper floors so the bottom of the tower can be dismantled. It can then be moved up making the tower crane higher as the building gets taller. Eventually the entire crane can be dismantled on the roof of the building it just constructed. The parts are lowered down by a smaller crane ready to be shipped to the next construction site.
They make a reinforced concrete base for it and then an even bigger mobile crane parks near and builds it up. modern cranes can build themselves but they are still fairly rare especially in “less developed” countries.
if interested i can send you a picture of it tomorrow, they are building it now where i work*
Additionally the crane base is usually built in the elevator shaft. This is for a couple reasons. First, the foundation for the heavy elevator and equipment is stronger than the rest of the foundation so it’s a better base for the crane. Second the elevator shaft is going to be in the same spot on each floor regardless of the layout of individual floors. Third, the elevator is either in the center or corner of the building allowing full access to the worksite. And finally the elevator shaft can remain open until the building is nearly complete as the elevator is one of the last components finalized in a build n
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