Hello, everyone.

This is Enta.

I’ll be giving a speech at a certain location within the Ministry of Justice today.

I'm already so excited lol

I’m always eager to try new things and learn from the experience, but speaking in front of people is really hard for me.

I'm going to go break out in a bunch of weird sweat lol

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But that's beside the point.

Verification of the Number of Anchors Installed

After completing the lath installation, the lath used for the installationAnchors (φ16 × 400 mm, φ9 × 200 mm)のCheck the number of piles drivenI will.

I believe this is a required item on the checklist for every local government.

The number of piles driven and the anchor sizes may vary somewhat depending on the client and the construction site.

At least 30 main anchor pins (φ16 × 400 mm) per 100 m²,

Auxiliary anchor pins (φ9 × 200 mm) = 150 or more.

I'll check this, but since checking it based on 100 m² would be completely out of the question, I'll convert it to a per-10 m² basis and check it that way.

I think it used to be listed in the Ministry of Construction’s “Yellow Book” (Cost Estimation), but since it’s now based on market unit prices, it’s probably not included anymore.

Converted to 10 square meters, that isMain anchors = 3, auxiliary anchors = 15　That's how it works.

10 m² is2 m high × 5 m wideThat's fine, too, or2.5 m × 4 mThat's fine, too. Anyway...10 m²If there is one, that's fine.

  

This is the kind of atmosphere it has.

Be sure to hold the 2-meter and 5-meter ribbon rods against the frame so you can see the frame dimensions clearly.

In general, when managing the site on your own, please take photos so that the number of items can be verified as much as possible.

However, on the Nagano University embankment, it’s often impossible to take a photo from the front; sometimes you can only shoot from the side of the 10-square-meter area.

It can't be helped to some extent, so let's just accept it.

Lately, taking photos with a digital whiteboard has become a lot easier!

Blackboards no longer slide off the mountain, and we no longer have to ask craftsmen to carry them!

 

For the main anchor and auxiliary anchorMarking with a Spray CanWe will carry out the following.

In my case,Main Anchor = Red　Auxiliary Anchor = Blue　It states that...

If I remember correctly, it was for a construction project in Miyazaki Prefecture, and for the markings,Do not spray!

Something surprising happened.

As for the reason, there's talk that spray paint makes it harder for the paint to adhere to concrete... lol

Another reason is that it's hard to tell with a spray, so they do it to make it clearer.

I can see why you might say it lacks clarity, but I have absolutely no idea what “concrete adhesion” means.

In Miyazaki Prefecture, red, blue, and yellow circular rings are sold commercially to make things clear, and you slip one of each onto the anchor.

And then it's time to shoot. Naturally, visual confirmation is far more advantageous than using a spray.

However, it’s actually quite a hassle. Or rather,I don't see the need to go this far just for a confirmation.

But if that's just common sense in that prefecture, then that's fine by me lol

And as for the issue of concrete adhesion,

Since the reinforcing mesh and anchor pins weren't included in the strength calculations during the design phase, I can't really say for sure lol.

I digressed a bit, but once we're done with the number of anchors, it's time to measure the last layer.

Actually,The Most Important Part of Lath InstallationHere it is.

We're going to overlap the wire mesh on Track #14, but,The design overlap is 100 mm.That is the case.

So, as long as it’s at least 100 mm, that’s fine.

And thisThe only formwork installer capable of as-built measurementsWhat is needed isLast LayerThat's it.

As-Built ManagementIt must be recorded as such.

However, a common misunderstanding is that the number of anchors installed is also included in the as-built measurements.

Although I’m included in that group myself, it means that checking the number of items isn’t necessary because the finished product isn’t in that form.

However, since management requires keeping records of something, we are currently managing this as part of our finished product inspection process.

 

As an aside, the basis for the design value of 100 mm for the top layer is that officials at the former Ministry of Construction had previously used the notation “two or more” (futame)...

It seems they set the value to 100 for the sake of quantifying the design and actual measurements, but with a stitch size of 50 × 50 mm, that worked out to 100 mm for every 2 stitches.

In short, it seems that a misunderstanding on the part of a high-ranking official at the Ministry of Construction back then still persists today.

In reality, the diagonal of the mesh is 52 × 1.414 × 2 = 147 (the old mesh was as large as 52 mm) to 50 × 1.414 × 2 = approximately 141, which is roughly 150 mm.

A Former Employee of the Ministry of Construction Speaks

There are still plenty of standards and measurement items out there that stem from minor misunderstandings, aren't there?

Those management tasks that make you wonder, “Why am I even doing this?”—they might actually stem from a misunderstanding.

See you later.

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Core Die

A Guide to Core Stands

Manufactured and Sold by Wakazono Seisakusho

Bolt Scale, Dedicated Box, Clip Spacer, and Greenery Spacer
Please see below for inquiries and retail locations.

Natural Applied Sciences, Inc.
(Slope Greening Materials Group)
Phone: 052-212-1441

Koiwa Wire Mesh Co., Ltd.
(Contact the Chubu Branch)
Phone: 0568-75-7710

Showa Co., Ltd.
(Kagoshima Prefecture)
Tel. 099-296-1234

Fujiwara Industries Co., Ltd.
(Bolt scale only)
Phone: 06-6683-0797

Ura-Tsuji Industries, Inc.
(Shimane Prefecture)
Phone: 0852-24-6881

Corporation Tosei
(Shizuoka Prefecture)
Phone: 054-631-9110
Fax: 054-631-9112

KF Co., Ltd.
(Osaka Prefecture)
Phone: 072-232-6060