{"id":48407,"date":"2023-02-02T08:00:07","date_gmt":"2023-02-01T23:00:07","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=48407"},"modified":"2026-05-17T14:28:32","modified_gmt":"2026-05-17T05:28:32","slug":"groundanchor-qualitytest","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/groundanchor-qualitytest\/","title":{"rendered":"When the results of a ground anchor suitability test fall outside the upper and lower limits"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

By the end of this month, five employees from the second cohort\u2014three Vietnamese employees at Enta and two at Izumi\u2014will be leaving the company.<\/p>\n

One person is staying on for an extension, but it still feels lonely when so many people leave all at once.<\/p>\n

I'm looking forward to the new technical interns arriving this spring, but I also feel a bit sad.<\/p>\n

I really hope they\u2019ll be able to put Japan\u2019s civil engineering expertise to good use in Vietnam like this.<\/p>\n

\"Spray-Applied<\/p>\n

\n

But that's beside the point.<\/p>\n

 <\/p>\n

This is the aptitude test for Grand Anchor.<\/p>\n

I imagine this is something almost everyone has experienced, but,<\/p>\n

The elastic displacement measured during the qualification test did not fall within \u00b110% of the theoretical value.<\/p>\n

<\/p>\n

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.<\/p>\n

This is the result of trying various things, poring over books, and repeating the cycle of trying, listening, and trying again.<\/p>\n

To cut to the chase, it's really not something to worry about that much, lol.<\/p>\n\n\n\n\n
1: Is it safe in relation to the design anchor force?<\/p>\n

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.<\/td>\n<\/tr>\n

2: Whether the load-displacement relationship is appropriate.<\/p>\n

(Ground Anchor Design and Construction Standards, Commentary, p. 192)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

An anchor is generally considered to be functioning properly as long as it stretches to some extent and does not come loose.<\/span><\/strong><\/p>\n

 <\/p>\n

Well, I\u2019m definitely not joking (lol), but in my case, I make that clear even when I\u2019m at the city office.<\/p>\n

\"Since it hasn't come loose, it's functioning as an anchor.\"<\/p>\n

\"This exam is designed to make it difficult to determine whether an answer is correct or incorrect.\"<\/p>\n

Most government officials just say, \u201cI suppose so,\u201d lol.<\/p>\n

 <\/p>\n

Next, regarding point 2: Ultimately, as long as the price stays within the upper and lower limits of 101 TP 3T, that\u2019s fine, but it\u2019s hard to get it to stay there, isn\u2019t it?<\/p>\n

 <\/p>\n

The cause can essentially be boiled down to one thing, but,<\/p>\n

 <\/p>\n

Reason 1 (The Main Reason)<\/span><\/strong><\/span><\/p>\n

Instability during testing and measurement.<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

It\u2019s difficult enough just to conduct a 1\/100-scale test like this outdoors on scaffolding.<\/p>\n

Even a 1\/100 scale model can be blown around by the wind.<\/p>\n

I\u2019ve written about measurement methods before, but the analog-style method is the simplest and most accurate way to collect data (based on our company\u2019s standards).<\/p>\n

*However, this applies only to areas where the ground has sufficient bearing capacity and the load-bearing structures do not sink.<\/p>\n

 <\/p>\n

Reason 2<\/span><\/strong><\/span><\/p>\n

It is possible that grout has seeped between the PC steel strand and the polyethylene coating, causing friction.<\/span><\/strong><\/span><\/p>\n

In fact, I experienced this myself with a certain anchor.<\/p>\n

Since the anchor had no further stretch, the results did not fall within the range shown above.<\/p>\n

After that, as a countermeasure against the \u25cb\u25cb anchor, caps were added to the prestressed steel strands, weren't they?<\/p>\n

The fact that there are vinyl caps on either end of that anchor's PC wire is a remnant of that, lol.<\/p>\n

It's one of those things that people in the know are aware of, lol.<\/p>\n

 <\/p>\n

Reason 3<\/strong><\/span><\/p>\n

Calculation Error in the Free Dive Event<\/strong><\/span><\/p>\n

This actually happens quite often\u2014for example, mistakes like forgetting to specify that it\u2019s a condominium unit, or simply forgetting something by accident.<\/p>\n

(I used to mess up quite a bit with this back in the day lol)<\/p>\n

 <\/p>\n

As a countermeasure,<\/strong><\/span><\/p>\n

This is a contingency plan in case things get completely out of hand during a meeting or similar situation.<\/p>\n

Initial load (measured on the cylinder) \u2192 Maximum load 1 (measured on the cylinder) \u2192 Hold (until displacement is eliminated) \u2192<\/p>\n

Measure again \u2192 Initial load (measure the cylinder)<\/p>\n

(*Note: \"Cylinder measurement\" refers to the method of measuring a hydraulic cylinder with a vernier caliper.)<\/span><\/strong><\/p>\n

(This applies only when the structure under pressure is stable.)<\/span><\/strong><\/p>\n

 <\/p>\n

To put it simply, it's as follows \u2193.<\/p>\n

Initial Load \u2192 Maximum Load \u2192 Initial Load<\/span><\/strong><\/span><\/p>\n

Please use this to take measurements and calculate the elastic displacement.<\/p>\n

I think it'll probably come in, more or less.<\/p>\n

\"Aptitude<\/p>\n

*This means that if you just do a quick, one-time measurement, it will register accurately.<\/p>\n

When we perform cycle testing, the measurement accuracy gradually decreases.<\/p>\n

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.<\/p>\n

 <\/p>\n

As for the rest, while it might be a bit of a stretch to call it \u201cusing clever words,\u201d please make your decision based on the instructions of the engineer in charge.<\/p>\n

Basically, as long as it doesn't fall out, you're good to go!<\/p>\n

(So the problem is the testing method, but is that something that can be made up for with skill, experience, and a lot of talk? lol)<\/p>\n

\n

To get right to the heart of the matter,<\/p>\n

JIS Z 2241<\/b><\/p>\n

Test Method for Tensile Testing of Metallic Materials<\/p>\n

JIS Z 2276<\/b><\/p>\n

Test Method for Tensile Relaxation of Metallic Materials<\/p>\n

I hear that tests are conducted in the lab using test specimens ranging from about 100 mm to 600 mm in size.<\/p>\n

\"Doing that on-site... lol\"<\/p>\n

 <\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. By the end of this month, five members of our second cohort\u2014three Vietnamese employees at Enta and two at Izumi\u2014will be leaving the company. One person will be staying on after their contract is extended, but it\u2019s still going to feel lonely with so many leaving at once. I\u2019m looking forward to the new technical interns arriving this spring, though\u2026<\/p>","protected":false},"author":2,"featured_media":2896,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[28,36],"tags":[48,70,270,271,5566],"class_list":["post-48407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","category-quality","tag-48","tag-70","tag-270","tag-271","tag-5566"],"acf":[],"yoast_head":"\n\u30b0\u30e9\u30a6\u30f3\u30c9\u30a2\u30f3\u30ab\u30fc\u9069\u6027\u8a66\u9a13\u3067\u4e0a\u9650\u4e0b\u9650\u306b\u5165\u3089\u306a\u3044\u6642 - 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