An inch of rain precipitation is the equivalent of around 10" to 12" of snow, because of all the air pockets in the snowflakes. If snow is compressed, that air can be removed, and the result is effectively a bunch of ice cubes of only 1/12 the volume!
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On the floor of the bed of the truck, several items would be installed. First of all, narrow slots would be cut in the floor near the very side edges of the floor. Next, a 3" high, very heavy bar rests on the floor of the truck bed. It is on edge, extending from the front edge of the bed to the rear edge of the bed. Now, picture a fairly simple mechanism that (a) keeps this bar vertically on edge; (b) keeps the bar continuously parallel to the centerline of the truck; and (c) moves the bar laterally from one side of the truck bed to the other. The motion of this bar would resemble a VERY heavy duty windshield wiper, continually sweeping back and forth across the floor of the truck bed.
Snow that would be dumped in by the snowthrower to the left of the moving bar would get pushed sideways to the left wall as the bar moved to the left. By selecting the motion range of the bar, any reasonable "compression ratio" should be possible. For example, if the truck bed is 8 feet wide, it might make sense for the moving bar to stop moving toward the side wall when it is 8 inches away from it. That would generally have the effect of a 12:1 compression of the snow.
The moving bar should probably be wider at the top than at the bottom, a tapered cross section. This would tend to press the snow slightly downward as it moved. This should keep much of the snow from slipping up over the moving bar. At the end of the motion, when the compressed ice cube is directly over the slot in the floor, that angled side of the moving bar would press the ice cube downward through the slot in the floor. This would clear the compressed cube away for the next cycle in that direction.
The operation would compress snow going the other direction on the rightward motion of the bar, so the compressing effect would be continuous.
The only remaining necessary feature would be below the floor of the truck bed. Either a chute would be needed to eject the ice cubes outward so the truck didn't run over the cubes, or some conveyor or other mechanism would be used to send the cubes into a second truck or into a container that would be emptied at intersection corners.
That is all the mechanism that would be necessary! The moving bar could be moved by a pair of hydraulic cylinders (at front and back of the truck bed) or by a motor driven gear train such as a rack and pinion.
This configuration would seem to have a variety of advantages over the method described above, but it has an apparent disadvantage of not having an obvious way of disposing with the rapid accumulation of a multitude of rather small pieces of ice.
I had thought of making hemisphere shaped indentations on both sides of both fixed and moving bars, so the compressed snow would form little "marbles" of ice, but it is still not clear on how to get them out in just a second or two. Some sort of a snow blower mechanism could launch the multitude of ice marbles to a chosen destination, but getting the pieces out from between the bars seems to be a problem. Instead of creating marble shapes, I had also considered creating cone shaped ice cubes, with their points upward, and having a LOT of holes in the bed of the truck! The theory is that they would fall down through the holes. Experimental evidence is needed to know what shape of such small ice cubes would be best.
The community would also benefit by not having the inconvenience of piles of snow in parking spaces, or the problem of already having piles of existing snow when the next storm arrives.
The cost of this mechanism would be VERY reasonable. Its cost would amortize itself very quickly in reduced costs of equipment and labor that would have been paid for hauling the snow away.
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C Johnson, Theoretical Physicist, Physics Degree from Univ of Chicago