200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
(OP)
Hi, I am a design in front of me for a 200 ft deep by 75 ft diameter "wet well" pump station. If has a 20 ft thick concrete base footing and 3'-2" wide side walls. It also has a 26 ft diameter concrete pipe near the top of the fore mentioned base footing. Anyone have any ideas on how one would begin to estimate on how to construct something of this magnitude?






RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
If it's underwater, things get trickier. You have to close the top and pressurize it to keep the water out. This makes it very slow and hazardous for the workers, as they need to work in high pressures and run the risk of getting the bends.
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
On one job, we drilled in 3'-0' caissons at 3'6" centers. the inside face was to be broken out to reveal rebar to hold horizontal bars for the inside face. A stiffening ring was placed at the top, the interior was excavated to the next stiffening ring, then more excavation...This was close between working railway tracks.
Another was similar but with sheetpile, that needed more stiffening rings than the concrete. In both cases, ground water was a threat to pop the pit structure out of the ground.
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
Water pressure that deep?
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
_________________________
TKE
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
http://www.bradshawcc.com/projects/306/view/
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
Caissons sounds like a good way to go if soils allow.
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
If SlideRuleEra is right (and he almost always is), and this could be done without any pressurized compartments, it really makes sense.
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
I worked with 8-10 foot lifts of wall at a time and it worked great, it was a good production line effort.
Rocks required jacks/time consuming excavation so a good deep soil knowledge is critical for your case!
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
I remember on one job the pumping station disappeared completely during a long weekend.
As mentioned if under water things can get tricky, also the shaft may not sink exactly vertically, can be tricky.
Sometimes if above the water table it can be more economical to dig a large hole and form the walls both sides.
Geotechnical imput by experienced persons is vital.
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
Bottom line is the design is driven by the construction method and you need to engage a geotech and a construction company familiar with this work. The design is probably 75% geotechnical and 25% structural. The geotechs will have to do a boatload of analysis to get you anything you can use in design. There will be months of borings and Plaxis anaylysis befor you can even think of a construction method.
RE: 200 ft deep X 75 ft diameter wet wet pump station....How would you excavate and construct a project
My recommendation is that you look into consulting some of the large geotechnical contractors. A simple phone call, with an interesting project, and most of them are willing to talk to you about various solutions. You will want an experienced Geotechnical Engineer to assist you with analyizng the soil conditions and determining various parameters, but the contractor is the one who can/will actually build it.