Hello, everyone.
This is Enta.
The other day, I posted a little quiz on Facebook.
Wind power has a certain problemAnd!
Here's the answer.
The answer is right here!!
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影That's it.
When you stand within this shadow, the wings rotate at regular intervals.
The shadows of the blades, spaced at regular intervals, pass across the person.
Apparently, people can experience headaches, dizziness, or feel lightheaded when standing in that shadow.
ThatShadow Noiseis what they say.
Although the cause isn't yet clear, it looks like this will become an issue in the future.
It's true—people really are vulnerable to even the smallest, most trivial things.
And so, behind the scenes of this new technology, things like this are happening.
The person who took the time to write a detailed response on Facebook,"Dear Kappa Ebisen"...Here's the answer lol
Guess I'm stuck at this job for a while, huh? lol
But that's beside the point.
Single-Pipe Drilling (Single-Pipe Boring)
— Air Hammer —
This is a large-scale version of what is commonly known as a rock drill.
I think Yamamoto Lock Machine is the most popular brand, but there are also many other manufacturers.
Structurally, a rod (1–5 m) is attached to the main unit, a bit is attached to the rod, and
Since the main unit is equipped with a hammer, it delivers blows to the bit through the rod from behind.
Application Characteristics
Because drilling is done pneumatically, the bit rotates very quickly, but since the torque is lower than that of a hydraulic system, it is prone to jamming.
Jamming (Civil Engineering Terms for Use on-Site)
If the borehole becomes blocked by slurry or the collapse of the borehole wall, the return flow of drilling air and slurry is cut off, and
Since it's a bit with a large head to begin with, it naturally gets stuck.
If slime or air stops flowing back during drilling, you must immediately slide the unit backward (reverse) to prevent it from becoming difficult to remove.
The compressor will need to be a large model, and you’ll need at least 100 horsepower (Airman PDS390). (This varies depending on the air consumption of the rock drill.)
Rotation, impact, vertical movement, and air drilling—it’s all powered by air.
Under "Site Conditions II" as defined by market unit prices, a borehole diameter of φ65 is standard.That's it.
Actually, there are some larger bits, and with this machine,Self-drilling rock boltsWe can also pour concrete.
What Is a Self-Drilling Rock Bolt?
*Self-drilling rock bolts: Drilling is performed using a bit and rod; after drilling is complete, the rod is cut off to finish the process.
The rod itself serves as the main shaft of the rock bolt.
A construction method in which cement slurry is injected through a hole in the center of the rod.
The Drawbacks of Single-Hole Drilling
As mentioned above, since they are all air-powered,It's the fastest at drillingThat's it.
Even if it's only about 5 metersIf the mountain is good, it takes about 5 minutes.And I'll just dig it up.
On the other hand, if the mountain is in bad condition, it can take as long as 30 minutes to complete a single run.
Drilling Methods That Vary Depending on Mountain ConditionsThat's it.
Due to the winter cold, water droplets in the compressed air freeze, andThe machine itself won't turn onThat's right. (I think it's best to avoid construction at temperatures where the material might freeze.)
Measures for winter construction include the use of dry compressors, among other things, butThe lease payment isExtremely expensiveThat's it.
Compressor with AftercoolerPlease try searching for it.
And thenIt's very loud.
Dust is a major problem, and since it’s very difficult to control, this method isn’t suitable for urban areas or steep slopes where homes are located right nearby.
If you insert a water swivel between the main unit and the rod and let a small amount of water flow through it, you can keep the dust down.
However,The swivel itselfExtremely expensiveSo, the area around the hole gets really messy after drilling. In some cases, this can even cause the hole walls to collapse... It's a tricky part.
Risk of being struck by a flying stone from behindThere are also some.
In addition, since a tower crane is required for the suspended method, you’ll need to take its installation location into account as well.
A long time ago, a stone that had been kicked up by a passing car shattered the windshield of a truck.
Measures Against Stone Chipping
This video shows the results of an experiment conducted to address the issue of stone skipping.
At the same time, I hope this gives you a sense of what the drilling environment is like.
No measures against flying stones
Measures in place to prevent stone skipping
Measures to prevent loose stones are in place at other job sites
https://youtu.be/iQw8Zv2Uwnk
I think you'll clearly see that the amount of dust is extremely different.
If there isn't one,Since the debris scatters directly behind the vehicle, there is a significant amount of flying stones and dust.That is the case.
If so,Dust and flying stones fall to the groundSo, it hasn't scattered very much.
However, even if it is acceptable, I think it could use a little more refinement.
I hope to share the results of my modifications next time.
See you later.
I Love Machinery! Overseas Drilling Machines | Introduction to Overseas Models
