Underground Vent Shaft detail
Underground Vent Shaft detail
(OP)
I'm hoping someone can help with a suggested resource for a small diameter (12"-36" diameter) vertical shaft design. Maximum depth of the shaft is about 30'. Shafts are for utility and air supply for and undergound tunnel in rock and are to be installed by drilling a hole, dropping in the liner, and grouting the void. The current layout has some shafts penetrating the tunnel liner (reinforced shotcrete) directly through the ceiling and others adjacent to the tunnel liner and tied in at the base. Based on prelim. check, the grouting pressures seem to control the liner. The ground is fractured sandstone. One of the concerns is moisture/condensation within the pipe. Also, if there's a better forum to post this in, please let me know.
Thanks in advance.
Thanks in advance.





RE: Underground Vent Shaft detail
Other sources are any competant water well drilling outfit.
RE: Underground Vent Shaft detail
RE: Underground Vent Shaft detail
RE: Underground Vent Shaft detail
Thanks.
RE: Underground Vent Shaft detail
In terms of grouting the annulus around your shaft lining, your drilling contractor should be able to provide recommendations but if you arent at least somewhat familiar with grouting techniques, you could very easily end up with an unsatisfactory project.
What is the level of the local water table in the sandstone?? How permeable is the sandstone?? What pressures do you intend grouting to? Do you intend to use regular cement, or a microsil product or a chemical grout??
RE: Underground Vent Shaft detail