Delve into the intricacies of sheet S202, Typical Sections and Details, from understanding not-to-scale drawings to decoding the specifics of a typical elevator pit section. Gain insights into the minute details that make up these critical construction diagrams, from the size of the bolts to the placement of the rebar.
Key Insights
- The article meticulously analyses the details of construction diagrams, demonstrating that drawings such as those on sheet S202 are not to scale, but all text remains consistent in size across all details.
- Specifics of a typical elevator pit section are highlighted, detailing elements like the poured-in-place concrete wall, the placement of the rebar, the dimensions of the slab, and the use of galvanized steel grating.
- The piece also dissects further details including the welding instructions for the elevator separator beam, the specifications for curbs of varying sizes, and the precise layout of rebar in a typical stair at a support beam. Such intricate details ensure accurate and efficient construction practices.
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Let's review sheet S202, Typical Sections and Details. When you look at the big picture, you do not see that any of the details have a scale noted under them. So these are all not-to-scale drawings.
One thing you will also see, though, is that the text is the same size in all of the details. So let's look at drawing number one. This is a typical elevator pit section.
You can see that we have a poured-in-place concrete wall. You can see the rebar in vertical and also coming through. You can see that on the earth side of the poured-in-place foundation wall, that they want two inches clear between the exterior face and the rebar.
You can see up here the slope of the underside. Here they're saying T for thickness, and T divided by 2 is the distance between the bottom of the slab up here and the bottom down there, and T would be specified in the drawing itself. You're seeing that it's 5' 5", from the top of the slab to the elevator pit, and that it's a 1' thick slab.
You can see here they're talking about galvanized steel grating that goes into this lower pit. You can see how here we're actually seeing the masonry and the rebar. Here we're seeing the outline of the pit itself and then dashed lines for the rebar, since there's no pattern that tells us that this lower pit is in the background, so it's further back in the drawing.
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There's a separator beam located for the required positions. There's a reference to detail 2 on sheet S-202. If we pan over, we're seeing that here is that detail.
So again, the detail is here. It's enlarged over here. We're seeing the welding instructions on three sides of the plate here for the elevator separator beam.
Here's a call-out for how large the bolts are. Top of slab, see plan. See the elevator drawings for the sill angle size, if required.
Here's detail number 3. It's the detail for curbs that are either larger than 12 inches, are 6 to 12 inches, or are less than 6 inches. You can see the rebar that's in there. You see the call-out for the size of the rebar.
You see number 4 at 12 inches continuous for this rebar, and you're seeing that they want to have the roughened surface because these are two separate pours. This would be the first pour. That would be the second pour.
So these pieces of rebar would come up out of the ground, and then they would form and frame the rebar up in here. They're saying in this image, top of curb, see architectural drawings. Top of slab, see the appropriate plan.
They're calling out the size of the rebar, and they're saying concrete slab, see plan. There's a much simpler rebar here. Again, you can see the roughened surface right here, and also right here.
Let's just pan down. Typical stair at support beam. So here would be the stair assembly that's coming up, and this is how it's attached from the concrete formwork to the actual stair assembly.
This is the rebar that we saw on the foundation plan, so they're just giving more information about it. So you can again see the rebar. You can see the mesh that's under the slab itself, and then they're showing how the rebar is laid at the 45 degree angles around the column.
Here we have the typical slab isolation joint at the column. So again, the control joint is here, or contraction joint. Two names for the same thing.
They're showing that the control joints here on the angle have a minimum four inch typical distance around, and here they're just showing the rebar condition at angles where there are separate pores. If we look at this typical stair landing, mid-landing, again you can see the concrete pour. You can see the embedded plate, the steel angle.
Here we have a section at the loading dock, so there's a footing here, a wall here, a pore above here. This is the earth. This is the drainage system.
We have the corner condition up here. We have some dimensions from top of slab to the center line of the rebar at the top condition, and we're also showing the required distance here from the bottom of the footing to the rebar. Here we have a typical detail at over poured housekeeping pads, similar to what we've seen before.
We have the rebar coming up and over. Right in through here you can see a break line. So there's a note here that says coordinate size and location with architectural, mechanical, and electrical drawings.
So this is why we have a break line, because that could be any distance. They are showing an overlap requirement of one foot six between rebar on the top and rebar that is down below. So here we have many details.
Again, not to scale. This detail is referenced from this detail. There's the call out for the image and the page number.
Again, the information is very clear, well organized. It's a really good detail sheet, and I look forward to working with you in our next video.
