With a significant amount of water in the hole after pumping the water
out, it's better to pump the concrete into the bottom so the water will
rise up on top. Don't drop from a chute into standing water. "a few
inches" in a 4'x4' hole seems to me "significant" - 5+ ft^3 or 35+ gallons.
Another factor that an inspector might consider is the maximum free fall
from a chute.
see
http://www.ascconline.org/Portals/0/docs/POSITION-STATEMENTS/PS-17_FreeFallConcrete.pdf
Grant KZ1W
On 7/26/2015 13:09 PM, ve4xt@mymts.net wrote:
I hope to pour in August, but I too have water. If it's only a few inches, is
it worth worrying about?
73, Kelly
ve4xt
Sent from my iPhone
On Jul 26, 2015, at 13:31, "Patrick Greenlee" <patrick_g@windstream.net> wrote:
My next tower install is coming late this summer or early fall (depending on
when the tower is built/shipped. I fully expect the hole 4x4x8 ft to at least
partially fill up from ground water if I don't take precautions. Even during
the recent record setting drought I had ground water within 5 ft of the surface
but this is NOT a drought year.
Boat launching ramps are poured into forms fully submerged as concrete easily displaces
the water without being "watered down." My concern is that the walls of the
hole, if significantly soaked, may collapse. So I may put a sump pump in the hole with a
float switch to keep the water pumped down to a couple inches. I'll build a little
cubical wood frame and cover it with geotextile to filter out solids and not let the pump
clog.
Patrick NJ5G
On 7/25/2015 11:14 PM, Roger (K8RI) on TT wrote:
I had no problem keeping it wet. The spring water table was just a couple
inches below the surface. We kept a sump pump running until the concrete was
being poured into the hole. It was a good dry mix relatively speaking, yet
when the concrete reached the top, it was pushing out water.
As I was breaking up the over flow a couple weeks later, someone asked, "Wouldn't it be
easier to just paint it green?" The dirt under the hardened overflow was still soggy.
So other than sprinkling the surface, keeping it wet was not a problem<:-)
73
Roger (K8RI)
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