tough to put in fence post when the gound is frozen, and you don't want to be carrying one..
put in a few sheet metal screws towards the end of each pipe section, don't turn them in all the way, then short bits of wire wrap from screw on one section to screw on the next and hold it together, if that makes sense
can be tough when your hands are numb so there are some alternative ideas out there..also keep the wire wrapped permanently on one of the pair of screws, if you drop it in the snow it's gone....check out the wintertrekker forum for more
depending on, it can also be a good idea to cut a few poles and improvise scissor poles with some wire to support the stove pipe on the exterior
try and pitch out of the wind
good luck..