Hello, everyone.
This is Enta.
Do you know of any empirical methods used when reinforcing bars aren't designed for a specific application?
Parameters of Empirical Methods
| Item | Specifications |
| Drill Hole Diameter | φ65 mm |
| Reinforcement Bar Diameter | D19–D25 |
| Reinforcement Length | 2–3 m *)
*) When the expected depth of collapse is approximately 1 m, the length of the reinforcement material is 2 m, |
| Compaction Density | About 2 meters2One winner |
| Angle | Horizontal, angled downward by 10° or more; perpendicular to the slope |
This is the method for pouring concrete using the rebar insertion technique described above.
Well, since we pour concrete in one spot per 2 m², it’s not likely to collapse.
This is something I've also come to realize through experience.
They said that’s how the specs ended up looking like the ones above, but in reality, it was much simpler than that lol
The other day, I attended a study session hosted by an association.
During the event, I had the opportunity to hear from the person who developed this empirical method.
One drainage pipe was installed per 2 square meters of sprayed mortar.
If we pour the concrete with the rebar in place while we're at it, it'll look nice—so wouldn't one spot per 2 m² be enough!?
This is what we have right now,The Beginnings of Empirical MethodsThat's right! lol
In reality, there is absolutely no basis for this, and
Apparently, the reasoning was that since I had about 10 years of experience as a rebar installer at the Japan Highway Public Corporation prior to that, I would be fine.
Even now, I figure it must be okay since they're still using that method for construction, so I guess it's fine.
"It's working out somehow, so it's fine," lol
Well, since the person who decided that is the one saying it, it’s probably true, but it’s really interesting, isn’t it?
People who have gone through all sorts of experiments and experiences eventually take the plunge and make a decision, and that’s what ends up riding the wave of the times.
That's interesting.
Sometimes things like this get decided not just based on theory or experience, but just on a whim.
I thought that was interesting.
He also said that while there is a theory behind it, there are some things he just doesn't understand at all.
Even if it’s explained in a complicated way in books now, you’d be totally blown away if you knew that’s what it was all about in the beginning, lol.
Civil engineering really is an engineering discipline based on experience, isn't it?
Part of what makes civil engineering so interesting lies in its roots in design.
See you later.
Validation Test for Empirical Design of Rebar Insertion | Approach to Load Setting
