Hello, everyone.
This is Enta.
Do you know this bit?
This bit is designed for use in high-pressure water environments; it’s called a Kronen bit.
If the water pressure is high, water will gush out during drilling.
For example, even after drilling a 10-meter borehole is complete, if the internal pressure is high, the pressure will escape to areas of lower pressure, causing pressure to enter the casing.
The impermeable layer is generally formed of thick clay that is at least 1 meter deep.
Since the pressure increases starting around the second aquifer in this pressurized zone, the pressure becomes higher in the layers below this point.
If there is a cemented layer in this area, it means the anchor body won't fit.
Even though it’s called an aquifer, water is mixed in with the sand layers, so the sand flows back up.
Because of this, no matter how many times I clean the inside of the casing, the sand gets in the way and the anchor won't go in.
That's when you use Kronenbit.
https://fujiwarasangyo.jp/g02/
The structure is as shown above; basically, we drill holes using a model equipped with a check valve.
Thanks to this design, sand cannot enter the interior, ensuring that the anchor body can be securely positioned in its intended location.
I'll try to go into a little more detail next time.
See you later.
