{"id":39373,"date":"2019-06-26T08:00:56","date_gmt":"2019-06-25T23:00:56","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=39373"},"modified":"2026-05-15T22:06:25","modified_gmt":"2026-05-15T13:06:25","slug":"hard-to-spot-placement-error","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/hard-to-see-placement-error\/","title":{"rendered":"Even Hard-to-Detect Alignment Errors Are Perfectly Corrected with This | Measurement Tool"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

\"Anchor<\/p>\n

We use an anchor scale for construction management.<\/p>\n

Since the bore diameter is \u03c690 (nominal diameter), we are using an arrow plate designed for 90.<\/p>\n

 <\/p>\n

We'll conduct a site survey using a laser level to determine the exact location. Please calculate the coordinate values.<\/p>\n

\"Ground<\/p>\n

The confirmed position is at (0, 0) (x, y).<\/p>\n

It would be easier to understand if you explained this to the government office.<\/p>\n

 <\/p>\n

Using that as a guide, draw horizontal and vertical lines at the top, bottom, left, and right, as shown in the photo.<\/p>\n

After drilling is complete (or even during the process)Check the drilling length, drilling angle, and positioning error all at once!<\/strong><\/span><\/p>\n

\"Measuring<\/p>\n

This is a borehole length measurement.<\/p>\n

\"Drilling<\/p>\n

Measure the drilling angle.<\/p>\n

\"Anchor<\/p>\n

Measure the positioning error.<\/p>\n

 <\/p>\n

This concludes the as-built inspection for the anchor work.<\/p>\n

It would be so much easier if you could wrap things up neatly every time, wouldn't it? (Especially when organizing paperwork.)<\/p>\n

Haven't you always been worried about positioning errors?<\/p>\n

How should I take the photo? How should I measure it? Will the government accept it?<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

The absolute prerequisite for using an anchor scale is to accurately determine the designed placement position.<\/p>\n

As long as that's accurate, there's no problem.<\/p>\n

The anchor scale measures the difference between the actual installation position and the designed installation position.<\/p>\n

Come to think of it, most government offices accept this, and they don't usually have any complaints. (Though I don't know about any particularly nitpicky people, lol.)<\/p>\n

 <\/p>\n

If I measure through the casing, doesn't the position of the anchor inside stay the same!?<\/p>\n

People say that, but it\u2019s pretty much the same.<\/p>\n

\"Anchor<\/p>\n

This might be a little hard to understand, but after pouring the concrete, we secure the prestressing steel strands so that they are centered.<\/p>\n

We're pulling on it from above using a PP rope.<\/p>\n

Just this much is enough to get you almost right in the middle.<\/p>\n

 <\/p>\n

The original specification calls for a hole diameter of \u03c690 with a positioning tolerance of \u00b1100.<\/p>\n

The specified diameter is \u03c696, but in reality, it cannot move more than the radius of that diameter.<\/p>\n

Basically, the PC strand never strays more than 48 mm from the core.<\/p>\n

Even if the X-axis and Y-axis were 48 mm, the positioning error would still be 68 mm. (Not that X and Y would ever reach 48 mm, though lol.)<\/p>\n

 <\/p>\n

It is important to make construction management as accurate, clear, and simple as possible.<\/p>\n

Just by explaining complicated things in a way that\u2019s easy to understand, the inspector\u2019s evaluation will be quite different, won\u2019t it?<\/p>\n

That's what professionals do\u2014they make complicated things simple, right?<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

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

Hello, everyone. This is Enta. I\u2019m managing the construction using an anchor scale. Since the drill hole diameter is \u03c690 (nominal diameter), I\u2019m using the arrow plate for 90. We\u2019ll conduct a site inspection using a laser level to confirm the position. Please calculate the coordinate values. Once confirmed\u2026<\/p>","protected":false},"author":2,"featured_media":39128,"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":[48,97,169,356,1631,2409],"class_list":["post-39373","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","tag-48","tag-97","tag-169","tag-356","tag-1631","tag-2409"],"acf":[],"yoast_head":"\n\u5206\u304b\u308a\u306b\u304f\u3044\u914d\u7f6e\u8aa4\u5dee\u3082\u3053\u308c\u3067\u5b8c\u74a7\uff5c\u6e2c\u5b9a\u30c4\u30fc\u30eb - \u65b0\u30a8\u30f3\u30bf\u306e\u6cd5\u9762\u7ba1\u7406\u587e<\/title>\n<meta name=\"description\" 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