METHODS OF DEWATERING PIERS
METHODS OF DEWATERING PIERS
(OP)
We have a project with piers, when the pier contractor start drilling the piers they found water, the depth of the piers are about 45 feet deep, the water in the hole is about 10' from the bottom of the hole. To dewater the hole the contractor is placing the pump hose all the way to the bottom of the pier and start pumping the concrete, once the concrete lifted the water to about 10 feet below the top of the pier they start pumping the water out. The specs allow dewatering the hole by this method, is this a good way to do it, or which method is reccomended.
Thanks
Thanks






RE: METHODS OF DEWATERING PIERS
Regards,
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RE: METHODS OF DEWATERING PIERS
IMHO, it is preferable to remove the water before placing the concrete (unless the water inflow rate is to high to manage). To do this, submersible pumps with an electric motor located more or less at the pump intake may be used. There is no practical limit to how high a head the pump can produce - 45 feet would be no problem. Here is a link to generic information on submersible pumps:
http://en.wikipedia.org/wiki/Submersible_pump
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RE: METHODS OF DEWATERING PIERS
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RE: METHODS OF DEWATERING PIERS
RE: METHODS OF DEWATERING PIERS
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RE: METHODS OF DEWATERING PIERS
After the concrete has initially set (still within hours of the pour) the top foot or so of concrete should be chipped away as it usually has a very high water cement ratio. The chipping of the top concrete is OK to do early as this chipping will be less likely to damage the top concrete of the pier if the concrete is still relatively green.
RE: METHODS OF DEWATERING PIERS
RE: METHODS OF DEWATERING PIERS
Other times a temporary casing is used and is typically pulled when the tremie concrete is above the bottom of the tremie by a foot or so.
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
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