Hello, everyone.
This is Enta.
It's a beautiful, sunny day, isn't it?
I suddenly felt like having a Burger King for the first time in a while, so I went all the way to Osu in Nagoya.
I get a craving for Burger King every now and then!!
But that's beside the point.
I imagine you often perform pressure grouting when installing ground anchors, and in those cases, you use a pressure gauge to monitor the pressure, right?
Let me tell you about some handy items for those times.
It's called the Gauge Protector.
That's what's called a diaphragm-type diaphragm, isn't it?
When viewed from below, you can see a round piece of rubber.
The pressure gauge moves when the cement slurry pushes against this part.
This rubber is filled with oil (we call it compressor oil, but really, any kind will do).
Put the gauge on, and you're done. This prevents grout from getting inside the gauge and helps protect it from pulsations. This makes the gauge more durable.
Generally speaking, I think a gauge rated for up to 2 MPa should be sufficient for this level of pressure.
If you apply any more, the grout may seep out from the outside of the casing, escape into other voids, or—in some cases—create new holes, which could cause it to leak out more and more.
Going overboard isDo Not Do ThisThat's it.
By the way,
1 MPa is equal to 10.2 [kgf/cm²].
That means a force of 10.2 kg is being applied to a 1-centimeter square.
I think a pressure of around 0.1 to 0.4 MPa should be sufficient. (Though it’s not really necessary… lol)
By the way,It is not considered "pressurized concrete" unless it is pressurized and the pressure is maintained.
Once the pressure is relieved, it is the same as regular concrete (grout).
There's no concentration involved.
(The truth is, since there is no such test data, we don't know.)
I hope to be able to do it here someday.
See you later.
Gauge Protector Sales
Things to Keep in Mind When Selecting a Pressure Gauge | Measurement Instruments
