How does the crane used to build tall buildings gets higher than the building it sits on.?
97277
The cranes used to construct skyscrapers are built onto specialized rails.  When the crane's height needs to be increased, another section of the rails are installed to the top of the existing rail structure.  The crane is then ratched up to the top of the next rail section thus placing it higher than the rest of the building.
597479
That the crane should lift, at the most, this weight.\n\nIf it lifts beyond its capacity, there could be a catastophic failure.
467814
It's a structural version of the piece of metal put underneath shelves on walls for support.  It connects the main building to an extra room that juts out by supporting it form the underneath.
512280
if the crane isn't too high they just use another mobile crane to lift the counter weight into position. but i have also seen that sometimes they use a special helicopter to lift the weight to the height that is needed.
452103
The crane is first assembled using a portable crane. Then sections are added to it using a device called a top climber. Basically they detach the top while keeping it balanced on the tower, jack it up 20 feet, insert a new section of tower using the detached but still balanced crane itself (yikes!), and re-attach the crane to the new top.
10666
It really depends on how you define building.\n\nIf it is by highest point (including antenna), then it would be the  Sears Tower in Chicago, USA\n\nBy architectural top (top of roof)? Then it would be Taipei 101 in Taiwan.\n\nHope that helps.\n\nwiki has all tallest structures by category. Check the link below for more.
1010164
Up until 1998 the tallest building status was essentially uncontested. Counting buildings as structures with floors throughout, New York City's World Trade Center was the tallest including the antennas, Sears Tower in Chicago excluding the antennas. As antennas were usually excluded, Sears Tower was counted as the tallest. When Petronas Twin Towers in Kuala Lumpur, Malaysia was built, some felt that the "spire" extending to 9 meters higher than the roof of the Sears Tower was just added to "cheat" its way into the spot as tallest building. Excluding the spire, the Petronas Towers were not taller than the Sears Tower.
780232
Water towers store water at an elevated height to provide sufficient water pressure (from gravity) in the water system.  The water gets in to the tower via pumping.  If you need to know more, see:\n\nhttp://en.wikipedia.org/wiki/Water_tower
141339
These cranes are built on hydroliclifts, that lift the crane up enough to remove a section of the tower.  The lifts, then lower the crane to repeat until each section has been removed to the crane itself, which is hoisted by another crane.
739218
It's about time we had a "sticky" for this question, it gets asked so often.\n\nThese cranes build themselves.  Four short sections are bolted together and a small crane hauls itself up on rails located INSIDE these sections.  It then pulls up another four sections for assembly around itself and away it goes again until the crane is erected to the desired height.  The jib is assembled at ground level around the trunk and hauls itself up on rails OUTSIDE the trunk sections.
981841
area of the base times the height.
223033
It's the low pressure on top of the wing that pulls it up, as opposed to the high pressure under the wing pushing it up.
464518
There has been quite a bit of talk lately about building a space elevator, which works the opposite way; hang a cable from a satellite in geo orbit down to earth, then have an elevator climb up it (see wikipedia: space elevator)\n   In that case, the tensile strength of new nanotube materials is just high enough to make it possible (steel's strength-to-weight is far too low).  Since most materials are much stronger and more stable in tensile strength than in compression, building a tall building to geosynchronous orbit is probably impossible from a materials point of view.  On the other hand, you could build a building lower than geo orbit, but anything released from the top would fall to earth.  You'd have to launch rockets or use a cannon or railgun or something from the top to accelerate them to orbit.
240493
Depends on the type of crane.  There are tower cranes, crawlers, self-erecting crawlers, and mobile cranes to name a few.\n\nMobile cranes transport themself to the job site.  If they have a lattice boom instead of a hydraulic boom then the boom segments will be brought in on a flat bed trailer and attached to the crane.\n\nA crawler that isn't self erecting will require a second crane to help put it together.  The different pieces will come in on semi-trailors and will be lifted off of the trailers and assembled.\n\nA self-erecting crawler will have the engine and cab assembly come in on one trailer then it will actually use something to support itself as they back the tracks in under it.  Then they will put on their own counter-weights and then attatch the boom.\n\nA tower crane requires another crane on the site to erect it.  Some of the tower cranes will actually be able to add in additional sections to raise their height.\n\nAs far as removal it's the reverse of erection.  If the crane isn't self erecting then you need to bring in another crane to put it together or take it apart.
547007
Hello Hassan,\n\nDepending upon the materials used in the construction of said beam, it is possible that the beam has been lifted at the points of a harmonic. When the slightest breeze passes by it will induce a vibration that will continue to ascend, impelled by the very little help of the breeze. Soon, all ears nearby will be held and crying screams will be heard while the beam rings ever increasingly loud.\n\nAfter some point in time, the stresses in the beam caused by the vibration will overcome the tensile strength of the entire beam and cause it to shatter like glass.\nYour question is moot unless the construction workers can place the beam in position before the crescendo of vibration has time to escalate.\n\n-Gabe
785975
In the US most are called Tower Cranes and they actualy lower them selves down part way then using Mobile Cranes they diss asemble them the rest of the way
134391
Almost all buildings settle as the weight of the building compresses the subsoil supporting it.  In a typical house that may cause a only a few cracks in the plasterboard walls, etc.  But you would never notice from the outside.  For a very tall narrow building a little settling would be magnified by the height.  And once tilted, the load on the subsoil would no longer be evenly exerted and the tilt may help increase itself.  When the Tower of Pisa was built, much less was known about soil engineering and you took what you got, especially if the building far outlived the builders.  I believe that there have been many schemes to return the tower to plumb but little interest because the tower would lose its historical appeal.  They just want to reduce the tilt if necessary and insure that it never actually topples.