Glass Mullions Corner Plan Drawing
A couple weeks ago, I posted a video about the Empire State Building construction, showing crews working high higher up footing with little or no PPE. Soon after, this video made the rounds, showing window washers rescued from the 57th floor of a building in China. Whatever acquired the equipment to intermission down, at least they got to go abode that night. Stuck three hours doesn't sound all that bad, does information technology?
With those 2 videos in listen, hither's another vertigo-making story. It seems now that every new condo and resort hotel – like this Honolulu residential tower – has a cantilevered, glass lesser pool manner up in the air overhanging the street. I'm not willing to have a dip in one of those myself, yet. I notwithstanding haven't heard from the silicone folks about how silicone works in aquariums, then am wondering how they sealed the joints in these bad boys.
Shifting gears, every so often nosotros humans paint ourselves into or find ourselves stuck in a corner. Getting "backed into a corner" usually is simply a figure of speech, but I take had that happen to me in reality, every time a set of drawings comes in with corners that don't yet exist. Just so we accept our semantics down, Figure 1 below is my definition of "outside" and "inside" corners. All of united states take probably detailed and synthetic corners with ii typical mullions oriented xc degrees to each other, and filled the gap, either at the outside or at the back of the mullion with restriction metal or panel fillers. Only they take upward a square area, roughly the depth of the system, then they are bulky and not a lot of architects are fond of them.
Effigy 1: Classification, 45 degrees Geometry
Figure 2: Inside Corner "Y" (© 2015 / TGP)
And then the architects draws "arrow" mullions, similar to those shown in Figure i. The within corner mullion shown in Figure two matched the "T" curtainwall we drew for an interior lobby wall. The open legs of the "Y" would have gotten a lot longer with 1-inch glass, or captured glazing.
The corners can have on, literally and figuratively, a shape all their ain. Which brings me to the "rocket ship" extrusion I accept on my desk, from a job in 1983. It's a shape for a 45-caste corner. The building was basically a 45o/xco/45o triangle in plan, and this was the 45-degree corner mullion. Made upwards of a total of 10 pieces of five different extrusions, we thought the shop was going to kill us. And believe it or not, the mullion on this task was 5 inches deep (half dozen ¾ inches if you include the glass), structurally silicone glazed.
Figure three: The "Rocket Ship"
And in that location are some horror stories that go with information technology. Those little silverish extrusions at the nose? We had to put them into ALL the vertical extrusions, considering at the time, adhesion of silicone to Kynar was NOT allowed, even though the "arrowhead" at the superlative of the corner got a kynar stop. The sealant manufacturers plain allowed the application to Kynar finishes later, simply non at that time. So that little extrusion got an alodine finish for compatibility and adhesion to the structural silicone. The host extrusion received a thermal acrylic paint. To say the two parts didn't exactly slide together is an understatement. It wasn't a question of tolerances, we were well inside allowable, and even went to a custom extruder for the adaptors to concord less than commercial tolerance on them. We cut them into 1-foot to 0-inch lengths, and they didn't slide any easier. The store ruined many a mallet on that adaptor…
The gobs of metal (ten 4) inside the shape that wait like they could seat a fastener head did just that; they were for the screws to hold the unitized horizontals to the mullions. Except when you lot went to tighten them, the back of the horizontal would "slide" off the back point of the corner mullion, non allowing proper alignment unless yous didn't tighten the spiral. The assembly guys wanted to kill us, likewise. We should have just put clips in the ends of the horizontals, where the screws would have gone in at a xc-degree bending to these parts. This is otherwise improve known equally "lessons learned."
And as bad every bit that corner looks on paper, the only identify you could really run into that 13.06-inch face was from exterior the building, looking thru the glass, simply that was tough to do, too, because the glass had a cogitating coating on information technology. From the interior, all you got was a foreshortened view of the corner; the typical mullions correct next do this corner looked noticeably deeper.
So there's likely a dozen and i ways to configure a corner, and there's certainly simpler ways than this. Turning a corner'due south never been so hard since, thankfully!
Thanks for reading.
PS: While non a candidate for "Hoarders," I practice take the shop drawings for the Rocket Send if you'd similar 'em…
Source: https://www.usglassmag.com/fieldnotes/glad-we-turned-that-corner/
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