{"id":40765,"date":"2019-12-12T08:00:19","date_gmt":"2019-12-11T23:00:19","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=40765"},"modified":"2026-05-17T06:56:34","modified_gmt":"2026-05-16T21:56:34","slug":"existing-anchor-head-strange-part-2","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/existing-anchor-head-strange-part2\/","title":{"rendered":"The Heads of Existing Anchors Are Abnormal (Part 2) | Root Cause Analysis"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>My answer from the other day, lol<\/p>\n<p>This is the one with the different head design.<\/p>\n<div class=\"linkcard\"><div class=\"lkc-internal-wrap\"><div class=\"lkc-unlink\"><div class=\"lkc-card\"><div class=\"lkc-info\"><div class=\"lkc-favicon\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.google.com\/s2\/favicons?domain=norimen.net\" alt=\"\" width=\"16\" height=\"16\" \/><\/div><div class=\"lkc-domain\">Shin-Ent's Slope Management Seminar<\/div><\/div><div class=\"lkc-content\"><div class=\"lkc-title\">Shin-Ent's Slope Management Seminar<\/div><div class=\"lkc-date\">\ud83d\udd52\ufe0f<\/div><div class=\"lkc-excerpt\">For those of you who are serious about learning about slopes!<\/div><\/div><div class=\"clear\"><\/div><\/div><\/div><\/div><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-40739\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.36.22-1.jpg\" alt=\"Head Processing\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.36.22-1.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.36.22-1-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Actually, the metal plate and wire attached to this anchor head are there to prevent accidents in the event that the prestressed steel strand breaks and flies off!<\/p>\n<p>I'm keeping it covered.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-40740\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.35.43.jpg\" alt=\"Overloaded Anchor\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.35.43.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.35.43-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>This means that the ground anchors installed in the existing pile frames are subjected to loads greater than anticipated and are therefore in an overloaded state.<\/p>\n<p>The reason for the overload is that the mountain has shifted.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-40766\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/d0ec45dba9c0fe158ed230fbc0d2feb4.png\" alt=\"Legal Framework, Anchors, and Assumed Slip Lines\" width=\"600\" height=\"400\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/d0ec45dba9c0fe158ed230fbc0d2feb4.png 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/d0ec45dba9c0fe158ed230fbc0d2feb4-300x200.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>I tried sketching it out roughly.<\/p>\n<p>Install the formwork on the natural ground and set the anchors.<\/p>\n<p>Assuming the ground is stable, let's say something unexpected happens.<\/p>\n<p>For example, an earthquake.<\/p>\n<p>In such cases, if a landslide occurs along the assumed slip line (red line), the retaining wall and the underlying rock mass will tend to slide downward.<\/p>\n<p>However, since the anchor is in place, a force is applied to hold it in place.<\/p>\n<p>&nbsp;<\/p>\n<p>This means that excessive force is applied to the anchor.<\/p>\n<p>This is<span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">Overload Condition<\/span><\/strong><\/span>That's right. (A state in which the load exceeds 100% of the rated load.)<\/p>\n<p>To prevent this, we have installed a cushion frame within the legal framework and installed ground anchors.<\/p>\n<p>And it seems like they just handled the issue at the head end without relieving the load on the overloaded anchor.<\/p>\n<p>It is likely that unloading the cargo could have placed a strain on the newly installed anchor.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-40767\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.36.00.jpg\" alt=\"Treatment of Anchor Heads Under Excessive Load\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.36.00.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2019\/12\/2019-12-04-11.36.00-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Attach a rubber sheet to a steel plate about 10 mm thick, install hole-in-anchors into the formwork, and secure it with wire.<\/p>\n<p>Since a broken PC strand shoots out with tremendous force, this seems like a reasonable estimate.<\/p>\n<p>&nbsp;<\/p>\n<p>When I see cases like this, I can\u2019t help but think that...<span style=\"font-size: 150%;\"><strong><span style=\"color: #ff0000;\">A tension level of about 70\u201380% is appropriate.<\/span><\/strong><\/span>I think so.<\/p>\n<p>Back in the day, I hardly ever pulled 100%.<\/p>\n<p>It was generally around 80%.<\/p>\n<p>However, consultants these days say it's 100 percent.<\/p>\n<p>&nbsp;<\/p>\n<p>Personally,<span style=\"font-size: 130%;\"><strong><span style=\"color: #ff0000;\">It's safer to set it as the standby anchor at around 80%.<\/span><\/strong><\/span>That's what I think.<\/p>\n<p>This will require consultation with the local government, but we recommend around 80%.<\/p>\n<p>I believe that ensuring we can safely handle unforeseen circumstances is also part of our job.<\/p>\n<p>What do you all think? lol<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. Here\u2019s the answer from the other day (lol)\u2014the one with the weird-looking head treatment. Actually, the metal plates and wires attached to this anchor head are there to prevent accidents in case the PC steel strand breaks and flies off! They\u2019re covering it up. The ground anchored into the existing formwork\u2026<\/p>","protected":false},"author":2,"featured_media":40741,"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":[48,61,2309,3013,3014,3015,3016],"class_list":["post-40765","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","tag-48","tag-61","tag-2309","tag-3013","tag-3014","tag-3015","tag-3016"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ 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