About Nominal Diameter | The Difference Between a 90 Drilled Diameter and Actual Dimensions, and Cement Calculations
Hello, everyone. This is Enta. The other day, Ishio-kun, a construction-themed YouTuber, came to visit our company! We went together to tour a construction site where Enta is the primary contractor for Ishio-kun’s construction channel, and he interviewed us about all sorts of things lol. The general contractor also kindly gave us permission to mention their name…
Since the nominal diameter differs so much from the actual size, quite a few people are under the wrong impression.
Hello, everyone. This is Enta. I’m sure you’re familiar with the term “nominal diameter,” but it’s actually quite different from what design consultants tend to think it is. Nominal Diameter: You often see borehole diameters like 90, 115, or 135 listed in design documents and drawings, right? And for cement slurry…
Drilling Limits with Spring Drills (Part 2) | Continued Analysis
Hello, everyone. This is Enta. Regarding the spring drill boring I posted about the other day—it actually went well in the end, lol. It was a 17-meter borehole in sandy soil. The borehole diameter was φ115. It went surprisingly smoothly. (There’s a trick to it, lol.) Well, since the drilling angle was a vertical 90 degrees this time, I thought…
On-Site Risks During the Basic Test | Preliminary Verification
Hello, everyone. This is Enta. I conducted a basic test the other day, and the specimen pulled out at around 100 kN. Well, since that test was strictly for determining τ (circumferential friction resistance), that’s fine, but when it pulls out earlier than expected, various problems start to arise…
I Tried Drilling a 15-Meter Hole with a Spring Drill 40 II (φ115) | Machine Verification
Hello, everyone. This is Enta. Starting this week, we’ve been drilling holes for ground anchors in Yamanashi Prefecture. Since all the drilling machines we normally use for anchors are currently out on other jobs, this is our first time using a spring drill. The maximum drilling depth is about 15 meters, and the bore diameter is φ115. I’m really nervous…
Even Hard-to-Detect Alignment Errors Are Perfectly Corrected with This | Measurement Tool
Hello, everyone. This is Enta. I’m managing the construction using an anchor scale. Since the drill hole diameter is φ90 (nominal diameter), I’m using the arrow plate for 90. We’ll conduct a site inspection using a laser level to confirm the position. Please calculate the coordinate values. Once confirmed…
Reasons for Selecting Drill Hole Diameters and Changes | How to Choose Between 45, 50, and 65 mm
Hello, everyone. This is Enta. For the past few days, I’ve been feeling kind of down ↓↓↓ lol. There are good days and bad days. Even on days like that, I want to make sure I can keep my head up. But anyway, someone asked me, “What determines the bore diameter?” So, I’m going to write about why that is…
Clip Spacer Flexibility Q&A | Sizes, Lead Times, and Unit Prices
Hello, everyone. This is Enta. We finally had some rain the other day that felt like typical rainy season weather, didn’t we? It seems like there’s been less rain than I expected. I wonder how this year’s rainy season will affect our work?? I’m curious to see how the rain will play out! But enough of that. Here’s the content of an inquiry we received regarding clip spacers. This time, we’ve recently received…
Rock Bolt Drilling Diameter | Differences Between Site Conditions I and II and Market Unit Prices
Hello, everyone. This is Enta. The other day, I was talking to a slope-construction worker I’ve known for a long time. He said he’s gotten a lot older lately and doesn’t have the strength he used to. Apparently, he hardly ever goes out to job sites anymore, but he says there just isn’t any work. Since the start of January, orders in the Tokai region have been a bit slow, and there’s a surplus of…