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DMcGrath (Civil/Environme)
19 Apr 07 16:22
We have three groundwater monitoring wells that need to be abandoned and removed from the ground to a depth of at least 26' below ground surface. They must be removed due to a future landfill on top. The wells have multiple steel casings, each with the annular space filled with grout. From the inside out, you have 4" steel, grout, 12" steel, grout, 18" steel, grout (25" bore).
The overall well depth is 180' or so. Short of pile driving it further into the ground, what are our options for cutting the casings at 26' deep and pulling it out? Open excavating to get to that level will be challenging, expensive, and dangerous. I'm thinking a shape charge explosive to cut the pipes, but that's just from the "wouldn't it be cool" aspect.
Thanks
civilperson (Structural)
19 Apr 07 16:31
字串5
No need for shaped charges, regular dynamite sticks will suffice. Grout the well full to a level ten feet below the final finish elevation. Bundle together and lower explosives into well to top of grout. Attach pulling implement to top portion, plug the upper section with sand bags/grout and blast. Pull out the upper fraction from the top.
BigHarvey (Geotechnical)
20 Apr 07 3:24
There are tools that can be fitted on the drill string of a small drilling rig ( for cutting steel grouting tubes ) but I doubt they can cut more then 5 to 10 mm of steel.
Otherwise AIR LIQUIDE ( compressed gases supplier ) has cutting torches that can be lowered in a hole to cut a steel pipe.
bimr (Civil/Environme)
24 Apr 07 17:32
You might contact an experienced well driller.
Here is a method called overdrilling with a hollow stem auger: 字串6
Well Decommissioning
Measure the well鈥檚 depth before it is sealed. Do this to ensure that no obstructions might interfere with effective sealing. Record static water levels.
To properly seal a well:
鈥
（Click：）
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