Hello, everyone.

This is Enta.

It has been decided that we will be installing rock bolts starting next week and continuing for a while.

Well, that's fine, but the Vietnamese staff are back in their home country for a while, so we're short-handed lol

We'll do our best together lol

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But that's beside the point.

How to Make a Packer: Part 2

But before that, I received a question regarding Part 1 of the previous post.

Q: For the "settling length," is the calculated value acceptable? What should we do in the case of compressed types?

 

This is a tough problem, isn't it?

Personally, I think that when using a packer,

Isn't the all-packer design the correct anchor structure?I think so.

 

When using a packer,

Use this when cement slurry spills or leaks.

OrUse this option if you do not want grout applied elsewhere.

I think that's the true spirit of a packer.

 

However, the question above raises the point: “Aren’t tension-type anchors and compression-type anchors different?”

For now, let's set aside the possibility that the grout might be leaking.

Please consider the structure of a ground anchor.

In the case of tension anchors, the load is concentrated at the boundary between the anchored section and the free length.

That means an enormous compressive force is applied to the cement paste in that area.

Let's say there's a packer there. The edge is cut off, right?

Don't you think an all-packer is the way to go, after all? lol

Even if it was practically impossible, if possible...

It's better to have a packer for a length of at least 1 meter beyond the anchorage point.I think so.

This is purely a structural issue.

*The pink part in the image above is the packer.

I think there are pros and cons to this way of thinking.

Here's what I actually think about tension anchors.

However, in actual construction projects, packers are rarely included in the design specifications, and

Sometimes, even with a design change, the compensation offered is somehow rather meager.

 

Since we don't have enough money to use all-packers—even with ingenuity and corporate efforts—we tend to end up using only the fixing unit.

According to government-set prices, a standard, genuine packer costs over 5,000 yen per meter (materials only), lol.

I guess the "real" part is a bit of a stretch... lol

If the installation cost is around 10,000 per unit (design), that’s a pretty reasonable price.

 

Next time, I'll write about compression anchors.

 

See you later.