{"id":55121,"date":"2025-07-28T08:00:39","date_gmt":"2025-07-27T23:00:39","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=55121"},"modified":"2026-05-16T16:02:52","modified_gmt":"2026-05-16T07:02:52","slug":"ground-anchor-tensioning-procedure-details","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/ground-anchor-tension-procedure-detail\/","title":{"rendered":"I've written a detailed description of the procedures for tension control in ground anchor construction."},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

I\u2019d like to outline the procedures for tension control in ground anchor construction.<\/p>\n

\"Stress<\/p>\n

\u25a0 The Purpose of Stress Management<\/h3>\n

Ground Anchor'sTension (Pulling) Operations<\/strong>Check whether tension has been applied to the installed PC strands and whether the force is being transmitted to the ground through the anchorage.<\/p>\n

In order to accurately apply the required tensile force (design load) to the ground<\/strong>will be held at .<\/p>\n

This is performed to determine whether the anchors that were actually installed meet the quality standards required to achieve the performance specified in the design.<\/p>\n

The performance required by the design is that it be sufficient and safe with respect to the design anchor force; specifically, it must be able to withstand forces greater than the design anchor force,<\/p>\n

It must have an appropriate load-displacement relationship.<\/p>\n

The test is conducted to verify the quality of the materials used, the quality of the installation, and the quality of the installed anchor, and to determine whether the anchor is suitable for service.<\/p>\n

 <\/p>\n

\u25a0 Procedure (Construction Management Process)<\/h3>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Procedure<\/th>\nContents<\/th>\n<\/tr>\n<\/thead>\n
\u2460 Setup and Preparation<\/td>\nAfter installing the anchor, set up the tensioning equipment (tensioning scaffold, jack set, dial gauge, etc.)<\/td>\n<\/tr>\n
\u2461 Initial Tension (Preliminary Tension)<\/td>\nJack up the structure to approximately 10\u2013201 TP3T of the design load to remove slack from the PC strands. Begin measuring elongation. Set the zero point here (using this reading as the reference).<\/td>\n<\/tr>\n
\u2462 The Tension Phase<\/td>\nApply a load in approximately five stages starting from the initial load. Continue applying the load in up to 10 stages depending on the load (e.g., Initial \u2192 20% \u2192 40% \u2192 60% \u2192 80% \u2192 100%).<\/td>\n<\/tr>\n
\u2463 Tensioning to the Specified Load<\/td>\nTension the jack up to the design load, and while maintaining the load for the specified duration (1\u201310 minutes), check for any loss of load.<\/td>\n<\/tr>\n
\u2464 Load and Displacement Measurement<\/td>\nAt the specified load, read the load and the extension from the load cell and displacement transducer (the displacement is measured at the jack head).<\/td>\n<\/tr>\n
\u2465 Comparison with Tolerance Values<\/td>\nPerformed the following checks:
\n\u30fbKnow the elongation when the displacement is appropriate (no excessive elongation) ((maximum load for that stage \u2013 initial load))
\n\u30fbIf it's too long \u2192 It may be missing
\n\u30fbNo elongation \u2192 Is there grout in the free length!? (In this case, if the structure is subjected to the design load in a single application, the grout may fail and the structure may return to normal.)<\/td>\n<\/tr>\n
\u2466 Consolidation<\/td>\nWhile maintaining the tension load, secure the assembly with mounting nuts or similar fasteners, then remove the jack (consider in advance how to handle any set loss).<\/td>\n<\/tr>\n
\u2467 Records<\/td>\nRecord the load, elongation, displacement, and other data on the log sheet.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

 <\/p>\n

\"Anchor<\/p>\n

\u25a0 Table of Load Retention Times by Soil Type (For Reference)<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Soil Classification<\/th>\nTypical Examples<\/th>\nEstimated Holding Time (Under Design Load)<\/th>\nReasons and Points to Note<\/th>\n<\/tr>\n<\/thead>\n
Hard Rock (Hard Rock)<\/td>\nGranite, andesite, hard sandstone, etc.<\/td>\nAbout 5 minutes<\/strong><\/td>\nIt appears there is virtually no displacement.<\/td>\n<\/tr>\n
Medium-Hard Rock<\/td>\nMudstone, shale, etc.<\/td>\n5 to 10 minutes<\/strong><\/td>\nDisplacement characteristics can be determined by holding the load for a certain period of time<\/td>\n<\/tr>\n
Soft rock<\/td>\nWeathered granite, tuff, etc.<\/td>\nAbout 10 minutes<\/strong><\/td>\nBased on the soil conditions in this area, there is a slight tendency toward creep.<\/td>\n<\/tr>\n
Well-compacted soil<\/td>\nSandy soil, soil mixed with sand and gravel, etc.<\/td>\n10 to 15 minutes<\/strong><\/td>\nAlso be mindful of displacement in the load-bearing plate, as well as settlement and deformation<\/td>\n<\/tr>\n
Loose soil<\/td>\nClay, silt, humus, etc.<\/td>\n15 to 20 minutes or more (check the amount of displacement carefully)<\/strong><\/td>\nBe mindful of ground bearing capacity. Since settlement and deformation are likely to occur over time, closely monitor pressure gauges and displacement measurements.<\/td>\n<\/tr>\n
Fill Soil and Backfill Soil<\/td>\nBackfilled Soil and Graded Soil<\/td>\n20 minutes or more (check the displacement carefully)<\/strong><\/td>\nDue to the high risk of unevenness and deformation, hold for a longer period; closely monitor the pressure gauge and displacement.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

*Please follow the instructions in the installation manual or the guidance of a ground anchor installer regarding the actual holding time.<\/em><\/strong><\/span><\/p>\n

In reality, if there\u2019s almost no displacement, just keep rewinding the time!<\/p>\n

This is exactly where I can put my Ground Anchor Installer certification to good use!!! (Is this the only place I can use it!?)<\/p>\n

 <\/p>\n

Opinions on this dwell time vary among engineers.<\/p>\n

That's because some people are adamant about the holding time.<\/p>\n

However, it is clearly explained in books on ground anchor construction.<\/p>\n

\"If the displacement is 0.5 mm or less, it can be considered stable,\" so be careful\u2014if you don't handle this part properly, you'll end up testing forever lol.<\/p>\n

\"Stage<\/p>\n

Generally speaking, there are occasional cases where the conditions of the natural ground cause the results to fall outside the design criteria.<\/p>\n

The most common reasons why it doesn't fit are:<\/p>\n

Incorrect Installation of a Dial Gauge<\/span><\/strong><\/span>That's it.<\/p>\n

To be honest, it's much harder to take measurements outdoors at the 1\/100 level, and there's a significant margin of error.<\/p>\n

Therefore, as long as the data hasn't been omitted\u2014even if the test values aren't included for the time being\u2014there is no problem.<\/p>\n

However, if you want to verify the data accurately during the inspection, apply tension up to the maximum design load. (At this point, measure the hydraulic cylinder at the head with a vernier caliper.)<\/p>\n

Then return it to the initial load. (Measure the hydraulic cylinder again with calipers at this point.)<\/p>\n

Subtract the initial load elongation from the maximum value; if the result falls within the acceptable range (between the upper and lower limits), there is no problem.<\/p>\n

I'll share some detailed tips in a video sometime lol<\/p>\n

 <\/p>\n

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

Hello, everyone. This is Enta. I\u2019d like to outline the procedures for tension control in ground anchor installation. \u25a0 Purpose of Tension Control The tensioning (pulling) of ground anchors is performed to apply tension to the installed prestressed steel strands and to verify that the force is being effectively transmitted to the ground through the anchorage\u2026<\/p>","protected":false},"author":2,"featured_media":7853,"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_total_topic_count_hidden":0,"_bbp_total_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[28],"tags":[48,58,612,2184,6879],"class_list":["post-55121","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","tag-48","tag-58","tag-612","tag-2184","tag-6879"],"acf":[],"yoast_head":"\n\u30b0\u30e9\u30a6\u30f3\u30c9\u30a2\u30f3\u30ab\u30fc\u5de5\u306b\u304a\u3051\u308b\u7dca\u5f35\u7ba1\u7406\u306e\u624b\u9806\u3092\u8a73\u3057\u304f\u66f8\u3044\u3066\u307f\u305f - 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