![]() The survey before had drilled 6-9 bore holes and found that it was such and such soil. Recently there was a decently sized building (9 floors above, 3 below ground) with which I was involved. As you mentioned, those areas in NY are pretty well documented and stable. They bore down and determine the makeup of the soil, bedrock, etc. TLDR: Typical is extremely location, program and budget dependent.Īs another experience from someone in the field, I'll throw in some more information.īefore any building is built, a survey is done of the location. So you have roughly a 54m deep foundation for an 830m tall building (inc. But this project was based on a radically different set of economic priorities. There are additional buildings surrounding the actual footprint of the building that handle parking, mechanical and support spaces. Above that you have a reinforced concrete "raft" that is 3.7m thick to support a building that weighs approx 500,000tonnes. steel pipes (filled with concrete) that extend 50m below the bottom of the foundation. The foundation itself is the same size as the footprint of the building. The choice of foundation, therefore, can be thought of more as a raft. The sands of Dubai are pretty much constantly in flux. from bedrock to spire, compared to a nearly negligible foundation In contrast, the relatively cheap foundation system (due to the height of extremely stable rock) meant they could spend that money on a taller tower. The depth of the foundation, therefore, depended more on how deep they were willing to blast in order to put a few extra chillers or generators, vs. The steel goes right (basically) to the rock. ![]() The bedrock has been tested, poked, prodded, leveled and worked to the right spot, they drill in some anchors and boom they're away. The foundations of the "Freedom Tower" are basically just columns that hit bedrock. There are two rises in the bedrock, midtown and financial district. Additionally, it's made the construction of the new york skyline financially possible. The rise in the bedrock beneath the surface of Manhattan actually is what created it's elongated shape at the mouth of the Hudson, rather than eroding into the delta that marks the end of the Mississippi River. the Burj Kalifa (previously the Burj Dubai) Two interesting anecdotes are the World Trade Center "Freedom Tower" vs. Carl Sagan, CosmosĪrchitect / Engineer with a huge construction company here. We make our world significant by the courage of our questions and by the depth of our answers.
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