Mining Borax Shaft Freezing in Potash Mines Us Borax Inc 1954 to 1988 O
Mining Borax Shaft Freezing in Potash Mines Us Borax Inc 1954 to 1988 O
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In our eReader you can find the full English version of the book. Read Mining Borax Shaft Freezing in Potash Mines Us Borax Inc 1954 to 1988 O Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Mining Borax Shaft Freezing in Potash Mines Us Borax Inc 1954 to 1988 O
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To quickly assess the difficulty of the text, read a short excerpt:
Swent: So they were sweating this out.
Kendall: Yes. Ve decided that grouting was too risky, and we did some research. We found out that in Germany, particularly in the German coal mines, which were very wet, they developed a technique they called shaft- freezing. The way they did it is they drilled a ring of drill holes, thirty-five or forty drill holes, around the periphery of the shaft site, and injected brine --refrigerated brine --into those holes, circulated it up and down for months, unt...il the ground froze.
20 Swent: So what you had was really a ring that-- Kendall: You ended up with an icicle in the rock. Solid frozen ground. And then you sunk the shaft right down through the middle of that. It was an extremely expensive thing to do, but it appeared to be the safest thing to do, and that's what we did. We were sinking two shafts at the same time: one a service shaft, and the other a hoisting shaft. And of course, we needed two shafts for ventilation.
As you sunk the shaft through that wet ground, frozen ground I should say, immediately it was sealed up with huge cast-iron rings, four inches thick, of solid cast iron bolted together with lead gaskets to form a waterproof barrier.
What to read after Mining Borax Shaft Freezing in Potash Mines Us Borax Inc 1954 to 1988 O?
You can find similar books in the "Read Also" column, or choose other free books by Robert Eli Kendall to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Swent: So they were sweating this out.
Kendall: Yes. Ve decided that grouting was too risky, and we did some research. We found out that in Germany, particularly in the German coal mines, which were very wet, they developed a technique they called shaft- freezing. The way they did it is they drilled a ring of drill holes, thirty-five or forty drill holes, around the periphery of the shaft site, and injected brine --refrigerated brine --into those holes, circulated it up and down for months, unt...il the ground froze.
20 Swent: So what you had was really a ring that-- Kendall: You ended up with an icicle in the rock. Solid frozen ground. And then you sunk the shaft right down through the middle of that. It was an extremely expensive thing to do, but it appeared to be the safest thing to do, and that's what we did. We were sinking two shafts at the same time: one a service shaft, and the other a hoisting shaft. And of course, we needed two shafts for ventilation.
As you sunk the shaft through that wet ground, frozen ground I should say, immediately it was sealed up with huge cast-iron rings, four inches thick, of solid cast iron bolted together with lead gaskets to form a waterproof barrier.
What to read after Mining Borax Shaft Freezing in Potash Mines Us Borax Inc 1954 to 1988 O?
You can find similar books in the "Read Also" column, or choose other free books by Robert Eli Kendall to read onlineMoreLess
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