![\"Basic](\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2022\/11\/2022-11-22-08.53.15.jpg\")
<\/p>\nHello, everyone.<\/p>\n
This is Enta.<\/p>\n
We recently administered the basic exam for rebar installers.<\/p>\n
<\/p>\n
In a test to determine whether the designed circumferential friction can be eliminated,<\/p>\n
Since the legal framework is already in place, this is a basic exam conducted within that framework.<\/p>\n
<\/p>\n
Well, since there's no helping it, we'll go ahead with the exam as is, but this has really made me realize the issues involved.<\/p>\n
Based on the fundamental premise that it is generally better to conduct basic testing before installing the legal framework as much as possible, I will explain why this is the case.<\/p>\n
Some people might think it\u2019s standard practice to do this before construction begins, but that\u2019s not the case nationwide.<\/p>\n
We are carrying out construction based on a design that assumes circumferential friction can be eliminated.<\/p>\n
Since this is based on sample data (core logs) from the soil investigation tests, the basic tests are strictly for verification purposes.<\/p>\n
<\/p>\n
1. It makes it easier to select the placement locations for rebar during basic testing.<\/span><\/strong><\/span><\/p>\n 2. While legal frameworks exist, they can sometimes get in the way.<\/span><\/strong><\/span><\/p>\n 3. If the soil bearing capacity is insufficient, the bearing area can be increased.<\/span><\/strong><\/span><\/p>\n 4. If there is no circumferential friction, other construction methods can be considered.<\/span><\/strong><\/span><\/p>\n <\/p>\n 1A: Since the exam involves navigating legal boundaries, it\u2019s hard to pinpoint specific areas to focus on, isn\u2019t it?<\/p>\n 2A: Even when tightening with a jack, the frame gets in the way more than you'd expect, making it difficult to attach the gauge.<\/p>\n 3A: This was the biggest problem I ran into this time\u2014if the ground doesn't have enough bearing capacity, it just keeps sinking.<\/p>\n The pressure plate used during testing is quite thick.<\/p>\n The load-bearing plate shown in the photo above measures 500 \u00d7 500, but it weighs nearly 40 kg.<\/p>\n For that reason, I couldn't go any bigger, so I settled on this size.<\/p>\n It wouldn't be a problem if we could use a crane, but,<\/p>\n There's a limit to how much one person can be dragged around.<\/p>\n Also, while the dimensions within the frame are within the standard range, there is some variation, so it\u2019s safer to go with a smaller size to ensure it fits.<\/p>\n <\/p>\n (Bearing capacity refers to the ground's supporting force\u2014the force with which it pushes back\u2014when pressure is applied to it with a jack.)<\/p>\n The surface is crumbling due to weathering.<\/p>\n It sank 30 mm, but it stabilized after that, so it turned out okay.<\/p>\n <\/p>\n 4A: This time, we couldn't eliminate the surface friction and ended up slipping. (Half of the original plan.)<\/p>\n Since I had a larger jack on hand and the cylinder stroke was also quite long,<\/p>\n Fortunately, we were able to pull the load all the way to the limit of the ground bearing capacity, so at least we were able to conduct the test properly.<\/p>\n But since there's no circumferential friction, I have to redesign it lol<\/p>\n Since the legal framework is already in place, I believe the design will be based on that.<\/p>\n Possible methods include increasing the borehole diameter, increasing the borehole length (insertion length), and installing additional ground anchors within the frame.<\/p>\n Anyway, since it\u2019s going back to the design phase, it looks like my work will be pushed back a month, which is terrifying lol.<\/p>\n <\/p>\n See you later.<\/p>\n![\"Bearing](\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2022\/11\/2022-11-22-10.20.02.jpg\")
<\/p>\n