Hello, everyone.
This is Enta.
仕事は全くありませんが、会社で機械整備してますｗ
1年を通してコレだけ機械をバラバラに出来る期間は少ないんですよね。
だから、ここぞとばかりにバラバラにして各パッキンを変えたり、オイル漏れを確認したりして修理していきます。
せっかくばらすのでサビ止め塗って仕上げていく訳ですが、やっはり1日仕事になるんで、取付は後日。
そうなると順番に終わっていかないと訳が分からなくなりますねｗｗｗ
最後にボルトが余らないようにしたい所ですｗ
ユニットのオイル漏れの場所が分からなくてプロに聞いている所ですｗ
But that's beside the point.
This is the aptitude test for Grand Anchor.
I imagine this is something almost everyone has experienced, but,
The elastic displacement measured during the qualification test did not fall within ±10% of the theoretical value.
I've been through a lot. Every time, I end up explaining things to the government office while breaking out in a cold sweat, lol.
イロイロ試して、書籍を読みあさり、また試して、聞いて試しての繰り返した結果です。
結論から言いいますと、それ程気にすることも無いんですよね。
| 1: Is it safe in relation to the design anchor force?
The maximum design load is set higher than the design anchor force; if the structure can withstand this load, the design and construction are deemed to be appropriate. |
| 2: Whether the load-displacement relationship is appropriate.
(Ground Anchor Design and Construction Standards, Commentary, p. 192) |
An anchor is generally considered to be functioning properly as long as it stretches to some extent and does not come loose.
Well, I’m definitely not joking (lol), but in my case, I make that clear even when I’m at the city office.
"Since it hasn't come loose, it's functioning as an anchor."
"This exam is designed to make it difficult to determine whether an answer is correct or incorrect."
Most government officials just say, “I suppose so,” lol.
Next, regarding point 2: Ultimately, as long as the price stays within the upper and lower limits of 101 TP 3T, that’s fine, but it’s hard to get it to stay there, isn’t it?
The cause can essentially be boiled down to one thing, but,
Reason 1 (The Main Reason)
Instability during testing and measurement.
It’s difficult enough just to conduct a 1/100-scale test like this outdoors on scaffolding.
以前も測定方法を書きましたが、あのアナログチックな方法が一番簡単かつ正確にデータを取る方法です。(弊社比)
*However, this applies only to areas where the ground has sufficient bearing capacity and the load-bearing structures do not sink.
Reason 2
It is possible that grout has seeped between the PC steel strand and the polyethylene coating, causing friction.
In fact, I experienced this myself with a certain anchor.
Since the anchor had no further stretch, the results did not fall within the range shown above.
After that, as a countermeasure against the ○○ anchor, caps were added to the prestressed steel strands, weren't they?
The fact that there are vinyl caps on either end of that anchor's PC wire is a remnant of that, lol.
It's one of those things that people in the know are aware of, lol.
Reason 3
Calculation Error in the Free Dive Event
This actually happens quite often—for example, mistakes like forgetting to specify that it’s a condominium unit, or simply forgetting something by accident.
(I used to mess up quite a bit with this back in the day lol)
As a countermeasure,
This is a contingency plan in case things get completely out of hand during a meeting or similar situation.
Initial load (measured on the cylinder) → Maximum load 1 (measured on the cylinder) → Hold (until displacement is eliminated) →
Measure again → Initial load (measure the cylinder)
(*Note: "Cylinder measurement" refers to the method of measuring a hydraulic cylinder with a vernier caliper.)
(This applies only when the structure under pressure is stable.)
To put it simply, it's as follows ↓.
Initial Load → Maximum Load → Initial Load
Please use this to take measurements and calculate the elastic displacement.
I think it'll probably come in, more or less.
*This means that if you just do a quick, one-time measurement, it will register accurately.
When we perform cycle testing, the measurement accuracy gradually decreases.
If the anchor body itself is sound and functioning (anchored) properly, and yet it is not detected within the range, then the test method is flawed.
As for the rest, while it might be a bit of a stretch to call it “using clever words,” please make your decision based on the instructions of the engineer in charge.
Basically, as long as it doesn't fall out, you're good to go!
(マズいのは試験方法って事になりますけど、それをカバーするのは技術と経験と能書きｗ)
To get right to the heart of the matter,
JIS Z 2241
Test Method for Tensile Testing of Metallic Materials
JIS Z 2276
Test Method for Tensile Relaxation of Metallic Materials
I hear that tests are conducted in the lab using test specimens ranging from about 100 mm to 600 mm in size.
"Doing that on-site... lol"
(そろそろ怒られそうなのでやめておきます。)
See you later.
