The foundation of the spectacular Burj Khalifa, which has a great depth equal to a ten-story building, may be seen by taking a quick tour of the tower's petals. Unexpectedly, the Burj Khalifa's base is in charge of supplying energy constantly. Any tiniest issue with the electricity flow on a windy day can damage its foundation, and the results could be severe. Interestingly, the raft's base is twice as thick as two people's skin. Despite the raft's simple appearance, its construction was challenging since a substantial amount of concrete needed to be poured. The installation of steel rebars marked the start of the raft's construction.
The engineers finished this work at night and mixed the concrete with ice cubes while they did so because the next step required pouring in the concrete, which was a challenging task in Dubai's 40 degree heat. The entire raft was constructed out of concrete in four steps, each of which took 24 hours to finish. Bill Baker, the chief design engineer for the Burj Khalifa, still has a lot of obstacles to overcome, so let's start with the most important one. Soil settlement would occur during routine building construction if the design projections for settlement were off. Engineers always search for something they refer to as a "hard stratum," or firm soil, while constructing a building.
Watch the settlement of the construction once more. A building typically settles by a few inches as it becomes heavier. The dirt beneath the foundation is compacted and settles throughout this process, enabling the earth to produce the required reaction force and balance the weight of the structure.
Take a cross-section of Dubai's soil; all that can be found there is weak sedimentary rock and loose sand. The engineers dug down 140 metres, but they were unable to find a solid, stable stratum that could hold the Burj Khalifa. This location would have settled greatly and a tragedy would have been unavoidable if engineers had constructed a normal raft foundation there. Chief engineer Bill Baker came up with a straightforward answer for such a significant issue: the soil's frictional force. It is frequently seen that the sharp, thin rod Mr. Baker uses to pierce the sand eventually becomes immovable as a result of the increased frictional force. He built several piles beneath the raft.a foundation that is 10 storeys deep, the same as the Burj Khalifa. Take a cross-section of the foundation after it has been buried beneath the ground. As the rod drops, this will generate the frictional force that is produced by the sand around it. The Burj Khalifa had a settlement after it was finished being constructed, which is a very safe five centimetres. Let's put this base to the test. The raft pile Foundation would attain settlement more sooner and within safe settlement limits thanks to the frictional force these piles produce against the weight of the building and the assistance of the soil reaction force and additional frictional force. The following substantial challenge is how to construct. In order to construct these heaps precisely, the idea a In actuality, they started by utilising an auger digger to create a hole. The earth is perfectly removed by the blades of this tool, but Mr. Baker encountered a difficulty. As the soil was removed, a relatively simple answer became apparent: the aquifer beneath Dubai would collapse under the weight of the equipment surrounding the borehole and fill with salty groundwater.
The auger shaft was filled with a slurry as drilling fluid was concurrently poured through it. The slurry prevents the earth from collapsing because it exerts hydrostatic pressure on the borehole walls and is denser than water. Following the preparation of the borehole, the workmen installed a temporary hollow steel cylinder to save the soil for concreting. The steel reinforcement bars that had been welded into a lengthy cylinder were then added. Concrete vibrator-tamping is typically necessary. trench piping Despite the fact that this heaped raft is leaning against the gravitational pole, we have now developed a solid foundation design that can support the tallest building in the world in the rocky soil of Dubai. The foundation alone took two years to build. The complete foundation building process for this illustration of the Burj Khalifa. Do you have any design suggestions to address the fact that our piled raft design will collapse in a significant sandstorm? Sandstorms can be severe in Dubai, which is another test.
The Burj Khalifa is toppling over when it is glued in the middle from the power of the wind, but when it is bonded at the sides, it is standing strong according to the Burj Khalifa's original design. By simply increasing the number of piles in the wing region, we may also employ a method comparable to the pile design. Due to this innovative design modification, the Burj Khalifa is currently supporting a substantial weight on a makeshift test pile while analysing the settlement. The tests were conducted at 23 different points within the Burj Khalifa over the course of six months.
Why does the Burj Khalifa Foundation have to deliver electricity continuously?
While the cathode prevents corrosion of the rebars when DC current from the rectifiers is impressed between them, the anode corrodes badly with time and must be replaced after a number of years. They employed titanium mesh as a sacrificial anode and these rebars as a cathode to alleviate this issue. They built a precise cathodic protection system since the phenomena makes the bars brittle and prone to breaking soon. Of course, there shouldn't be an excess or deficit of electricity or a problem with the supply.
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