[ANSS-netops] Vaults and ARRA upgrade stations
Mark E Meremonte
meremonte at usgs.gov
Wed Apr 14 23:51:16 UTC 2010
Hi Dave & Nathan,
John McMillan, Can you give them the type of epoxy we used?
The pressure gauge was used to verify the 2 psi the o-ring on the lid was
rated for and to test a seal John is working on for the cable entry. John
has a cool cable entry seal he is designing that has two plates which
sandwiches a sealant material (duct seal in our case for testing purposes;
hope to find a better material) and forces it around the cables and up
against the inside of the conduit to form a water/air tight seal. In our
test we did it without the cables, vault full of water, and pumping 2 psi
into the system. Have not seen one leak yet, but I have not been back
to check since none of these 3 installations have indicated problems to
warrant a return. All have been in since mid-august 2009 and have
over-wintered well thus far. Maybe the melting season of Spring may tell
differently but not yet. Keep track of the PDFs at IRIS DMC. They will
tell us if troubles crop up.
The glass base protrudes out beyond the base of the barrel and that
protrusion is utilized to help anchor/couple the vault to the concrete.
So, yes, I pour 2-4 inches above the lip on outside of the vault. Below
the vault the amount of concrete used depends o the hole. However, we
used 6 80-lbs bags of concrete: 4 in the hole, place the vault, 2 above
the lip & around the whole edge. I did not use re-bar, if a larger
diameter hole then I use re-bar.
Both this vault "remote style" (or other name which I have not thought of
yet) and the McMillan have their place. We did use the remote style at
our site at TPNV on top of the mountain at NTS where difficult to get
concrete truck up to for McMillan style.
Finally, you asked about weight of saturated soil and plus snow on top.
The Idaho sites averages 12-15 of snow according to forest service.
Because this salvage drum is smaller then the big ones for McMillan, the
sides are thinner and lid less strong even though it is ribbed as you can
see in photos. I am not worried at all about the sides because I use
sand to backfill around the vault. The sand acts as a nice buffer between
the vault and angular rocks that may be present around the edge which may
break off and eventually (or possibly) dig into the side over time; and
the sand distributes the forces around the vault evenly giving the sides
more strength; and the sand helps couple whole system to Mother earth. Now
the lid, it can depress with enough force. So, I worried about that as
well. So, I placed a strong 1 inch thick, computer room false floor tile
over it. I am still looking for something other to replace the tile that
will be strong, lightweight, and will not deteriorate (or rot) over time.
I have not found that yet and we had lots of these unused floor tiles.
Maybe I am too honest here but there you go. Welcome comments and ideas
for strengthening the lid. The salvage barrel worked out well because it
is lightweight and it comes with the o-ring. This is what I was after in
the prototype I showed at the last netops meeting. I was against the
salvage drum at first because of the thinner sidewall but the sand has
remedied that problem.
Hope this helps in deciding what to do on vaults. I know Memphis has
their design which I should take another look at as well. They have all
that saturated, thick Miss. muds. I think this system would work well
there too but I should would like to test it. However, the Idaho site
may do the testing for me as the snow melts and the water has no where to
go but stay on top because it does not absorb into the granodiorite there
this vault is embedded in.
Enough, good night!
Mark
******************************************************************************
Mark E. Meremonte Geophysicist USGS/ANSS/NEIC
U.S. Geological Survey Work: 303-273-8670 Cell: 303-478-5766
MS 966, Box 25046 Email: meremonte at usgs.gov
Denver, CO 80225 Web: http://geohazards.cr.usgs.gov
Ship: U.S. Geological Survey, 1711 Illinois St., Golden, CO 80401
******************************************************************************
From:
"David S. Croker" <croker at usgs.gov>
To:
Mark E Meremonte <meremonte at usgs.gov>
Date:
04/14/2010 00:03
Subject:
Re: [ANSS-netops] Vaults and ARRA upgrade stations
Hey Mark,
I'm glad you responded. You and John seem to be ahead of the curve on
vault design. I like the smaller overpack barrel size of that version. Do
you mind answering a couple of questions?
1) what kind of epoxy do you use between the barrel and the glass?
2) you have a picture of the pressure gauge...what sort of pressures does
it hold? Have you seen one leak yet? I would be worried about what
static pressures it could hold in the real world, like that Idaho site.
What happens when you get the weight of saturated soil and 8 feet of snow
on top?
3) from the one install picture, it looks like you submerge the outside
rim of the glass plate in concrete by a few inches. True? How much
concrete do you have below the glass plate?
4) are you guys moving to that style only and away from the so-called
McMillan vault?
Glad to hear you are on the warpath to cellular service. Let me know if I
can help further. Say hi to John for me if you see him.
Cheers!
Dave
At 04:27 PM 4/13/2010, you wrote:
Nathan,
I cannot recall exactly what that *.ppt file showed but I think it showed
various vaults tested at ASL including a smaller style vault for, what I
called, "remote style". In any case, since then John McMillan and I have
designed a vault system with a glass base using an off-the-shelf salvage
drum that has a lid with an o-ring and using a PVC bulkhead fitting for
cable entry. This vault is similar to one I showed at last NETOPS meeting
where it was used as a table and/or chair. See photos of our mockup at
ftp://hazards.cr.usgs.gov/meremonte/Station-Vault/VaultDesign/Vault_SalvageDrum
and see an installation for the station PLID (Pearl Lake, ID) at
ftp://hazards.cr.usgs.gov/meremonte/Station-Vault/VaultDesign/Vault_SalvageDrum/Installed_PLID_Photos
.
As for response of the system see IRIS PDF plots for PLID at
http://www.iris.washington.edu/servlet/quackquery/pdfDrill.do?station=PLID&yyyyDDD=2010.032&length=31&location=++&channel=BHZ&network=IW
. This vault is installed in the Idaho Batholith using a CMG3-ESP and a
MEMS.
Also, we installed the same vault and seismometers at stations FXWY and
REDW in IW network. FXWY is in an old limestone quarry and REDW is on a
couple meters of fine-grained clay soil mixed with boulders on a limestone
ridge. The PDF plots plotted for same period of time as for PLID above
are at:
FXWY:
http://www.iris.washington.edu/servlet/quackquery/pdfDrill.do?station=FXWY&yyyyDDD=2010.032&length=31&location=++&channel=BHZ&network=IW
REDW:
http://www.iris.washington.edu/servlet/quackquery/pdfDrill.do?station=REDW&yyyyDDD=2010.032&length=31&location=++&channel=BHZ&network=IW
Mark
******************************************************************************
Mark E. Meremonte Geophysicist USGS/ANSS/NEIC
U.S. Geological Survey Work: 303-273-8670 Cell: 303-478-5766
MS 966, Box 25046 Email: meremonte at usgs.gov
Denver, CO 80225 Web: http://geohazards.cr.usgs.gov
Ship: U.S. Geological Survey, 1711 Illinois St., Golden, CO 80401
******************************************************************************
From: Nathan L Edwards <nedwards at unr.edu>
To: "anss-netops at geohazards.usgs.gov" <anss-netops at geohazards.usgs.gov>
Date: 04/13/2010 16:09
Subject: [ANSS-netops] Vaults and ARRA upgrade stations
Sent by: anss-netops-bounces at geohazards.usgs.gov
We were wondering what other networks are doing in regards to the
construction of new vaults, broadband in particular. Maybe something
along the lines of one that Mark Meremonte covered in this presentation?
http://earthquake.usgs.gov/research/monitoring/anss/internal/ppt/vaultDesigns02.ppt
Nathan Edwards
Development Technician
Nevada Seismological Laboratory
University of Nevada Reno
Reno, NV 89557-0174
o: 775-784-1106
m: 775-303-5899
f: 775-784-4165
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