{"id":7925,"date":"2018-08-21T08:00:08","date_gmt":"2018-08-20T23:00:08","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=7925"},"modified":"2026-05-17T14:35:53","modified_gmt":"2026-05-17T05:35:53","slug":"ground-anchor-construction-mistake-part-1","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/ground-anchor-construction-mistake-part1\/","title":{"rendered":"Where Is the Construction Error in the Ground Anchor Work? (Part 1)"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>It seems to be getting a little hot again, doesn't it...<\/p>\n<p>It feels like autumn has already arrived in Hokkaido...<\/p>\n<p>The seasons in Japan are all over the place! lol<\/p>\n<p>&nbsp;<\/p>\n<p>By the way, how about working at Enta? I'm serious! I really mean it!!<\/p>\n<p>I do get some prank emails asking, \u201cAre you hiring via email?\u201d lol<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">We're seriously looking for people who want to work in entertainment!<\/span><\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7926\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/job_roudousya_young-600x401.png\" alt=\"Job Openings\" width=\"600\" height=\"401\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/job_roudousya_young.png 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/job_roudousya_young-300x201.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<hr \/>\n<p>But that's beside the point.<\/p>\n<p>That super-rare video from the other day got quite a reaction\u2014I actually got a few calls from people asking, \u201cWhere? Which location??\u201d lol<\/p>\n<p><span style=\"color: #ff00ff;\"><strong><span style=\"font-size: 22px;\">Everyone's really curious! lol<\/span><\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>Well, let's put that aside for now and pick up where we left off the other day to think about why things turned out that way.<\/p>\n<p>So,<span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">Where Do Anchor Installers Make Mistakes?<\/span><\/strong><\/span>I'm going to write about that.<\/p>\n<p>&nbsp;<\/p>\n<h4><strong><span style=\"color: #0000ff;\">1. Drilling<\/span><\/strong><\/h4>\n<p>I assume that after drilling, the inside of the casing is cleaned.<\/p>\n<p>The term \"cleaning\" here refers to removing the slime left inside the casing.<\/p>\n<p>But it's hard to say just how effective the cleaning really is\u2014I guess it's better to do it than not, right?<\/p>\n<p>That's about the level of it. By the way, I didn't do that when I was younger.<\/p>\n<p>That's because, when using water-jet cutting as the main method, the flow isn't as intense as it is when using a compressor.<\/p>\n<p>It ended with me twisting the inner part around and around while letting the water flow out. (A little bit of slime comes out.)<\/p>\n<p>These days, though, since you mix water and air, you can really make it spray out with a bang.<\/p>\n<p>Therefore, just because you can't do this doesn't mean it will lead to an installation error.<\/p>\n<p>That said, while each book says to rinse with water, none of them actually say to blow it off with air lol.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7928\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/5a4083866c86c52b8c18a23198b206d4-600x460.jpg\" alt=\"Cleaning Inside the Casing\" width=\"600\" height=\"460\" \/><\/p>\n<h4><span style=\"color: #0000ff;\"><strong>2. Tendon Insertion<\/strong><\/span><\/h4>\n<p>Insert the tendon.<\/p>\n<p>If you don't use a bell mouth at that point, the poly hose in the free-length section may become damaged.<\/p>\n<p>If grout adheres to that area, the free end will become fixed, and the intended elongation may not be achieved.<\/p>\n<p>Also, it\u2019s a big problem if there\u2019s oil residue at the tendon attachment point before insertion.<\/p>\n<p>Since friction is absolutely essential for the attachment section, any reduction in friction is highly likely to cause the part to come loose.<\/p>\n<p>You should also be careful about wearing gloves during insertion.<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">This is where you might make a mistake.<\/span><\/strong><\/span><\/p>\n<p>Be sure to protect the mounting area thoroughly!<\/p>\n<h4><strong><span style=\"color: #0000ff;\">3. Cement slurry injection<\/span><\/strong><\/h4>\n<p>What do you think of the formula?<\/p>\n<p>Isn't there too much water?<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">The Key to Ground Anchor Construction<\/span><\/strong><\/span>This is the part<\/p>\n<p>Without a doubt, this is the most important part.<\/p>\n<p>If the cement slurry is too runny or you're worried about its consistency, it's definitely better to make a new batch!<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">If you mess this up, you'll definitely fail! I mean it!!!<\/span><\/strong><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7841\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/88f450b862c7d3e65504df87e9067284-600x450.jpg\" alt=\"Cement Milk: Complete\" width=\"600\" height=\"450\" \/><\/p>\n<p>A strength of 24 kN is easily achievable if you make it properly, but some people try to loosen it with water just because it\u2019s too stiff.<\/p>\n<p><strong><span style=\"color: #0000ff;\">If the mixture is too stiff, use a plasticizer to loosen it up!<\/span><\/strong>That would be better.<\/p>\n<p>Construction managers, please make sure to double-check this one thing.<\/p>\n<p>Also, be sure to inject starting from the deepest (lowest) point.<\/p>\n<p>This is a golden rule for anchor installation. The same applies to grout injection.<\/p>\n<p>*\"Dob-zuke\" grouting refers to a method in which, after drilling a hole, grout is injected into the casing first, followed by the insertion of the tendons.<\/p>\n<p>Please inject the fluid from the very bottom to replace the drilling fluid.<\/p>\n<p>If a thick stream of cement milk comes out of the mouth, the bonding area is likely fine.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7929\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/86dc7468ea5b9b1a25c2e4db5b4670d9-600x460.jpg\" alt=\"Replacement Injection\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/86dc7468ea5b9b1a25c2e4db5b4670d9.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/08\/86dc7468ea5b9b1a25c2e4db5b4670d9-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>You can't use milk that's as runny as the one in the photo above! lol<\/p>\n<p>Next is the pressure, but I don't really care about that. (Just my personal opinion.)<\/p>\n<p>In the publications of the Japanese Geotechnical Society,<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #0000ff;\">\"The work shall be carried out using methods appropriate for the ground conditions around the anchor body.\"<\/span><\/strong><\/span><\/p>\n<p>...is how it's phrased. It feels very vague.<\/p>\n<p>The reason is that, according to the Anchor Association\u2019s publications,<\/p>\n<p>\"It helps prevent the hole walls from loosening, but if you overdo it, it can actually cause them to loosen.\"<\/p>\n<p>It is often performed at pressures ranging from 0.1 MPa to 0.5 MPa, and<\/p>\n<p>\"When the anchor is deeply embedded, the applied pressure must be greater than the groundwater pressure and less than or equal to twice the equivalent water level assuming the water level extends to the ground surface.\"<\/p>\n<p>It states that...<\/p>\n<p>So, basically, applying pressure is the fundamental approach, but,<\/p>\n<p>In reality, tremendous pressure is exerted on the tendon attachment site due to the difference in height.<\/p>\n<p>Even though pressure is already being applied\u2014without any need to apply it on purpose\u2014<\/p>\n<p>I'm simply questioning whether it's necessary to spend any more than that.<\/p>\n<h4><strong><span style=\"color: #0000ff;\">4. Tension Work<\/span><\/strong><\/h4>\n<p>This has gotten a bit long, so I'll continue tomorrow.<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"text-decoration: underline; color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" title=\"Ground Anchor Construction: The Moment the Anchor Comes Out!\" href=\"https:\/\/norimen.net\/en\/wordpress\/%e3%82%b0%e3%83%a9%e3%82%a6%e3%83%b3%e3%83%89%e3%82%a2%e3%83%b3%e3%82%ab%e3%83%bc%e5%b7%a5%e3%80%80%e3%82%a2%e3%83%b3%e3%82%ab%e3%83%bc%e3%81%8c%e6%8a%9c%e3%81%91%e3%82%8b%e7%9e%ac%e9%96%93%ef%bc%81\/\" target=\"_blank\" rel=\"noopener\">The Moment the Anchor Breaks Free!<\/a><\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"text-decoration: underline;\"><span style=\"color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" title=\"What to Do When Cement Slurry Is Too Thick (Part 1)\" href=\"https:\/\/norimen.net\/en\/wordpress\/7767\/\" target=\"_blank\" rel=\"noopener\">What to Do When Cement Slurry Is Too Thick (Part 1)<\/a><\/span><\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"text-decoration: underline;\"><span style=\"color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" title=\"Using &quot;Plus&quot; for grout replacement makes it less prone to staining.\" href=\"https:\/\/norimen.net\/en\/wordpress\/%e3%82%b0%e3%83%a9%e3%82%a6%e3%83%88%e3%81%ae%e7%bd%ae%e6%8f%9b%e3%81%88%e6%b3%a8%e5%85%a5%e3%81%ab%e3%83%97%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%bf%e3%81%86%e3%81%a8%e6%b1%9a%e3%82%8c%e3%81%ab%e3%81%8f\/\" target=\"_blank\" rel=\"noopener\">Using \"Plus\" for grout replacement makes it less prone to staining.<\/a><\/span><\/span><\/strong><\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. It seems to be getting a little hot again, doesn't it...? It already feels like fall in Hokkaido... The seasons are all over the place across Japan! lol   By the way, would you like to work at Enta? I'm serious! I really mean it!! Are you accepting job applications via email?...<\/p>","protected":false},"author":2,"featured_media":7930,"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":[48,50,1000,1517,1660,1661],"class_list":["post-7925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","tag-48","tag-50","tag-1000","tag-1517","tag-1660","tag-1661"],"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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