{"id":44366,"date":"2021-05-28T08:00:25","date_gmt":"2021-05-27T23:00:25","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=44366"},"modified":"2026-05-17T13:25:49","modified_gmt":"2026-05-17T04:25:49","slug":"anchor-pullout-handle-part-3","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/anchor-pullout-handle-part3\/","title":{"rendered":"What to Do When a Ground Anchor Comes Loose (Part 3)"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

In this post, I\u2019ll explain what to do if a ground anchor at this facility comes loose.<\/p>\n

\"Stress<\/p>\n

Suppose a ground anchor comes loose in a tension structure.<\/p>\n

In technical terms, the expression \u201ccame off\u201d refers to what is known as \u201cadhesion failure.\u201d<\/p>\n

The approach depends on which part of the attachment has broken.<\/p>\n

\"Ground<\/p>\n

I\u2019ve written about this topic many times before, so veterans of ground anchors might be sick and tired of it, but I\u2019ll just skip over that part for those who aren\u2019t familiar with it lol.<\/p>\n

Ground anchors are tensioned through friction between the prestressed steel strands and the grout, and between the grout and the soil (anchorage).<\/p>\n

 <\/p>\n

Was the failure caused by a loss of bond between the grout and the prestressing steel strands, or a loss of bond between the ground and the grout?<\/p>\n

This is where it gets important.<\/p>\n

That's what we call troubleshooting, isn't it?<\/p>\n

 <\/p>\n

1. In the case of PC steel strands and grout: Was there oil on the PC steel strands? Is the grout\u2019s strength too low?<\/span><\/strong><\/span><\/p>\n

2. In the case of undisturbed soil and grout: Is the grout\u2019s strength low? Or is the undisturbed soil\u2019s friction strength low? (Low circumferential friction resistance)<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

In Case 1, it\u2019s highly likely that there was a construction error. However, this is also an area that\u2019s difficult to verify or check. (The grout test specimens are showing good strength, lol.)<\/p>\n

If the circumferential friction resistance (\u03c4) in Case 2 is too low and the fastening length must be increased to ensure a secure fastening, this will require a design change. (Depending on how many fasteners came loose.)<\/p>\n

 <\/p>\n

This circumferential friction resistance (\u03c4)\u2014known as \u201ctau\u201d\u2014is typically determined through basic testing and incorporated into design calculations; however, since not all sites allow for such testing, it is sometimes determined theoretically.<\/p>\n

Furthermore, because the bedrock consists of interbedded layers (layers of different types stacked on top of one another), it can be difficult to make a definitive determination, so there are some cases where a general statement cannot be made.<\/p>\n

 <\/p>\n

As an aside, I think \u201cit\u2019s hard to generalize\u201d is a really handy phrase\u2014it\u2019s the ultimate in ambiguity, lol.<\/p>\n

 <\/p>\n

So, if the anchor comes out, you\u2019ll naturally start wondering, \u201cHow are we going to proceed with the installation, considering the possibilities mentioned above?\u201d But if there\u2019s absolutely no other place to install it, we\u2019ll remove that anchor.<\/p>\n

The only option is to lift it out little by little using a jack.<\/p>\n

That\u2019s assuming it comes out, but most of the time it gets stuck halfway and won\u2019t come out, lol (the temporary ones do come out, though).<\/p>\n

So, based on my experience, I start by drilling into the same hole with a steel-cutting bit, cutting through the PC wire while adjusting the angle as I go.<\/p>\n

When drilling from a different angle, as long as you take the position and length into account and ensure that the anchor does not affect the bonding layer (i.e., does not overlap with the removed anchor), there will be no problem.<\/p>\n

It's usually a matter of raising or lowering it by about 3 degrees, or swinging it from side to side.<\/p>\n

\"Ground<\/p>\n

If you set the angle too high, the angle when processing the head will exceed 5 degrees, so that won't work. (It's OK as long as it's within 5 degrees.) It says so in the book, lol.<\/p>\n

Normally, tilting the structure up or down would change the load, but since this is a reinstallation, let\u2019s assume the load remains the same.<\/p>\n

If you\u2019re thinking, \u201cNo way, that can\u2019t be right!?\u201d you can recalculate the load for that specific area and reevaluate the anchorage load. (However, since that would require calculating the load-bearing structure and the total load as well, I\u2019m not really that particular about it, lol.)<\/p>\n

 <\/p>\n

Please keep in mind that this also raises the question of whether to increase the embedment length, depending on the circumstances under which the anchor came loose.<\/p>\n

Just as a general rule of thumb: if it comes out with a \u201cpop,\u201d it\u2019s likely a failure of adhesion for the PC strand. If the load slips away smoothly even when applying pressure with a jack, or if the load doesn\u2019t increase even when you raise the pressure, I suspect it\u2019s a failure of adhesion with the ground. You can\u2019t really generalize, though (lol). (I guess it comes down to experience?)<\/p>\n

There's a YouTube video below. The sound the anchor makes the moment it slips out is \"Pop!\" lol<\/p>\n

 <\/p>\n

The appropriate response and reporting procedure will vary depending on how it came loose, but the basic approach is to redo the work!<\/p>\n

In the case of construction errors, the contractor is liable; however, if the friction strength of the natural ground is insufficient, this is due to an error in the design estimates (theoretical calculations), so the matter will be discussed with the relevant government agency.<\/p>\n

However, since design revisions are generally rare, this can be a challenging aspect.<\/p>\n

 <\/p>\n

See you later.<\/p>\n

No one teaches you how to handle a situation where a ground anchor comes loose\u2014you just have to learn from experience.<\/a><\/p>\n

No one teaches you how to handle a situation where a ground anchor comes loose\u2014it\u2019s something you learn only through experience. (Part 2)<\/a><\/p>\n

Extremely Rare!! The Moment a Ground Anchor Worker Slipped!<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. In this post, I\u2019ll explain what to do if a ground anchor comes loose during tension work. Let\u2019s say a ground anchor comes loose during tension work. Technically speaking, this is referred to as \u201cadhesion failure.\u201d Depending on which part of the anchor has lost its adhesion\u2026<\/p>","protected":false},"author":2,"featured_media":4296,"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],"tags":[48,328,349,439,570,1659,2095,4446,4515],"class_list":["post-44366","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","tag-48","tag-328","tag-349","tag-439","tag-570","tag-1659","tag-2095","tag-4446","tag-4515"],"acf":[],"yoast_head":"\n\u30b0\u30e9\u30a6\u30f3\u30c9\u30a2\u30f3\u30ab\u30fc\u5de5\u304c\u629c\u3051\u305f\u6642\u306e\u5bfe\u51e6\uff08\u305d\u306e3\uff09 - 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\/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/norimenman\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-05-27T23:00:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-17T04:25:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/66e006c23507c86e765220bc9ae3329a.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"460\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"\u30a8\u30f3\u30bf\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@norimenman\" \/>\n<meta name=\"twitter:site\" content=\"@norimenman\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u30a8\u30f3\u30bf\" \/>\n<script type=\"application\/ld+json\" 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