Explore the essentials of reading architectural and engineering drawings with a deep dive into sheet S-301, the foundation schedule and details. Gain insights into understanding the size of footings, the reinforcement of structures, and the importance of accurate and clear information in construction drawings.
Key Insights
- The article provides a thorough review of sheet S-301, a foundation schedule and details, including the interpretation of different marks that represent the size of the footings and the reinforcement of structures.
- Understanding the foundation plan's specifics is crucial for the construction process, such as the rebar cages tied together around the column, the spacing between them, and the separate pore for the slab, among other details.
- Consistency and clarity in the information presented in the drawings are essential to avoid conflicts during construction. All dimensions and details should be accurately represented in one location to ensure smooth construction proceedings.
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Let's spend some time reviewing sheet S-301, the foundation schedule and details. I'm going to zoom into here. When we were looking at the foundation plan, there were references to the spread footing schedule.
So here it is. If you remember, on the foundation plan, we saw these different marks. These are the size of the footings.
So F4.0 is four feet wide, four feet tall, one foot three inches deep, and the reinforcement is four number sixes. Let's look at the typical column. Let's start at the bottom.
So here we have the spread footing per plan, and it's saying see the schedule for reinforcement. It's saying three inches clear, typical from the end of the rebar to the edge of the footing. There's a separate pour here for the slab.
There's an isolation joint between the slab and the column. You can see over here it's saying the first four rebar cages that are tied together around the column are six inches on center. Then it's saying for the remainder of the vertical distance, refer back to the schedule tie spacing.
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For the last two feet, before we get to the beam of the floor above, we have four spaced at six inches on center. Here we have the beam. Here we have the top of floor.
Like below, for all the floors, it's the same condition where we have four at six inches on center. Then we have what they're calling a Class B overlap. Then refer back to the schedule tie spacing.
Before you get to the next floor, four at six inches on center. See note one, and here's how the condition ends at the roof. Let's pan over.
Here we have a section of a ramp knee wall. So here's the grade beam. You can see that they're saying this rebar that comes down will extend eight inches into the grade beam.
Here's a rebar callout. Two number fours continuous. They're calling this one a number four at 12 inches, centered in the wall, with a standard hook.
So, there's the hook, down and through. And then we again have this rebar that comes up and over, and it's showing that this rebar extends two feet and two feet. So again, from here, go over two feet.
From here, go back two feet. Here's the section of the main mechanical retaining wall. So again, there's earth under the slab at the street level.
Here's the big retaining wall. So you can see that all of this area is earth. So, they’re digging out this footing.
You can see that it's an eight-inch pour for this wall. They're calling it equal. So this rebar is the center line of the wall.
This comes down here. There's one here in the footing that goes over, around, and back up, and it goes all the way up to here. Again, the Class B lap.
Let's pan down and over. I'm going to have to zoom back a little bit. Here's the section at on-grade ramp.
So again, we have a slab here, a wall here, a separate pour here, and another wall here. There's earth here, and the top of slab varies. We have the top of wall that varies here.
It says to refer to image six on S301 for additional information. Again, we have break lines here. That's saying that the distance from here to here varies.
So, there's a break line right in through here. We have this wall over here. Again, saying go to image six on sheet S302 for additional information.
Top of slab, top of footing; the footing extends six inches beyond this face of the wall. We have three-inch clearance from the bottom of the rebar to the bottom of the slab. It's one foot two from the left face of the wall to the right face of the wall.
It’s two feet three inches here. This wall is one foot thick, and this footing extends four feet six beyond this face of the wall. It says 14 number fours in this area, number sixes at 12 inches on center, with two inches of clearance from the top of the rebar to the top of the slab, and that the slab is one foot two inches thick.
You’ll notice that this dimension is not repeated here. We typically represent dimensions in one location to avoid confusion. The section at on-grade ramp, with similar information below in the footings.
The wall is a foot thick. We have the Class B overlap. We have the break line telling us from the top of ramp slab to the top of footing will differ based on condition.
The top of the wall varies. Number six bars are spaced at 12 inches with matching dowels. And then here is the callout for the rebar coming towards us.
Section of the elevator platform. Here’s the top of slab for the parking. Here’s a section up here.
They’re calling out the rebar. They’re saying four number twelves at top and bottom each way. You can see the callout here.
One-and-a-half-inch clearance on this side. Two inches clearance on this side. A Class A lap over here.
Again, the footing. We have the clear dimensions, the depth of the footing, and the top-of-footing measurement. So again, another good and impressive drawing.
You can start to see how the information is clearly presented. Information such as dimensions, is only mentioned in one location. The reason is that if you update it in one location and forget to update it in another, there’s conflicting information in the drawings.
Again, we want the information to be clear and accurate so that construction can proceed correctly. I hope you've enjoyed this drawing. Let’s move on to our next one.
See you then.
