August 17, 20169 yr comment_68012 Posting from the field here. I am on my Interstate overpass project where I am the project land surveyor, and I was wrapping up a survey and admiring the work our union carpenters have done. As we lay out the bridge, the carpenters come in behind us and set the"false work". The false work is the forms and supports that hold the iron work and eventually the concrete as it's poured to form the bridge. After the bridge is built, the false work is lowered and striped, exposing the finished bridge. How do they lower the false work after the bridge is finished? Go ahead, take a guess. The clues are in the images. Look low, and think Egyptians! Report
August 17, 20169 yr Author comment_68021 14 minutes ago, lew said: Probably not a guy with a sledge hammer. Well, a little bit of that Lew! Report
August 17, 20169 yr Author comment_68022 5 minutes ago, Chips N Dust said: Aliens? Ha! Not quite, all though some of these bridge builders out here resemble an alien! Pretty rough looking group some of em! Report
August 17, 20169 yr comment_68033 BTDT...... And...more letters....LULL... Edited August 17, 20169 yr by steven newman Report
August 17, 20169 yr Author comment_68038 10 minutes ago, steven newman said: BTDT...... And...more letters....LULL... Ok, ya got me on that one Steve, is this Gaelic or what! Report
August 18, 20169 yr comment_68069 LULL is a type of all terrain forklift. Another one was sold as a "Grade-all". We'd take the tension off the supports a bit, and slide out the shims. LULL to keep things from falling over BEFORE we wanted them to. Once there was enough clearance, we could start to remove the supports.....slowly and safely. BTDT= Been There,Done That.... Edited August 18, 20169 yr by steven newman Report
August 18, 20169 yr Author comment_68070 6 minutes ago, steven newman said: Once there was enough clearance, we could start to remove the supports.....slowly and safely. BTDT= Been There,Done That.... Close but no cigar my friend! Report
August 18, 20169 yr comment_68097 I'm hoping long sticks and hot dogs aren't involved since we have to drive over those bridges. Dan Report
August 18, 20169 yr Author comment_68113 2 hours ago, HandyDan said: I'm hoping long sticks and hot dogs aren't involved since we have to drive over those bridges. Dan That was good Dan. You know some times I wonder, when I drive these bridges! Report
August 18, 20169 yr Author comment_68114 I'll give y'all one more clue on how this false work is removed. It's so archaic, yet the method is used in the biggest of projects. Think sand, think Pyramids! Report
August 18, 20169 yr comment_68115 Maybe if the surface under the structure is compacted sand, you could wash it away. Report
August 18, 20169 yr comment_68126 They call them sand jacks. http://www.dot.ca.gov/newtech/researchreports/reports/2008/06-0633.pdf Dan Edited August 18, 20169 yr by HandyDan Report
August 21, 20169 yr Author comment_68782 That's it! Great job Dan. If you look closely at the images above, you'll see the sand jacks supporting the falsework. After the bridge is built and cured, we'll use one of two methods to release the pressure so the falsework can be loosened and lowered. Either holes will be drilled in the side of the sand jacks, allowing the sand to slowly spill out of the pour holes thus lowering the supports, or for a more rapid decent of supports, in some cases, the bands will be cut and the sand will all spill out at once. This method has been used to manipulate massive structures since the Ancient Egyptians. And it's amazing, we still use it today for large structures. Great research Dan! Report
August 22, 20169 yr comment_68853 6 hours ago, John Morris said: That's it! Great job Dan. If you look closely at the images above, you'll see the sand jacks supporting the falsework. After the bridge is built and cured, we'll use one of two methods to release the pressure so the falsework can be loosened and lowered. Either holes will be drilled in the side of the sand jacks, allowing the sand to slowly spill out of the pour holes thus lowering the supports, or for a more rapid decent of supports, in some cases, the bands will be cut and the sand will all spill out at once. This method has been used to manipulate massive structures since the Ancient Egyptians. And it's amazing, we still use it today for large structures. Great research Dan! And it was the Aliens that gave it to the Egyptians... Report
August 22, 20169 yr Author comment_68855 5 minutes ago, Chips N Dust said: And it was the Aliens that gave it to the Egyptians... Yer funny Chips.... Report
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