Hello, everyone.

This is Enta.

This is the casing from a self-drilling rock bolt, lol.

This is a site where slope stabilization measures have been implemented to prevent surface slippage.

Frame + Self-Drilling Rock Bolt

The reason for selecting self-drilling rock bolts is likely because the borehole walls are not stable enough to stand on their own.

Actually, since this mountain is experiencing increasing sandification and the drill hole entrance was in terrible shape, self-drilling rock bolts would probably be a good option.

This is the site where the measures taken to prevent surface collapse failed due to a deep-seated collapse.

It looked like the grout had been applied thoroughly, and there wasn't a single spot of rust.

But look at this photo—there’s absolutely no grout! It’s completely bare!!

That's what you're thinking, right? lol

Actually, when the structure collapses, the bond between the rebar and the grout breaks all at once, causing the grout to come away.

Since this is a high-strength grout, if external stresses—such as shear forces exceeding the design specifications—are applied, the grout will detach from the rebar and the borehole wall.

I get stripped naked as everything explodes around me!

And since the grout around the rebar is high-strength, it will likely snap off piece by piece and disappear.

In most cases, there’s no grout on rock bolts after a collapse, so don’t panic even if the authorities tell you otherwise! lol

(Since the government office doesn't have any grout either, I wonder if they injected some? lol)

However, that doesn't mean you should settle for a half-hearted injection—so be careful!

If you don't apply the treatment, raw steel will rust, and even galvanized steel will develop white rust—you can tell at a glance! Make sure to apply the treatment!!

A long time ago, while we were working along the riverbank on a river construction project for the Ministry of Land, Infrastructure, Transport and Tourism, a record-breaking downpour hit.

I remember that at the time, I was working on a 300-frame formwork project plus rebar installation, but the river washed away the entire back of the formwork, leaving the rebar sticking out like Pocky sticks.

Looking back now, I wish I’d taken a picture, but back then I was still using a film camera (lol).

I'd love to go to city hall to pick up some old photos from back in the day!

See you later.