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In constructing a helix with 1/2 plywood as roadbed and threaded rods to support the structure I have several questions. Pehaps someone could answer them. <br />1-if plywood is sold in 4'X8' sheets and cutting "donuts" to be opened and connected to make the spiral, how do you cut roadbed with internal radius greater than 48"? would you just make multiple segments and splice them together? <br />2-using threaded ros to support the structure with nut and washers seems to allow a short section of roadbed to be flattened off the grade. Is this a problem? if so how do you prevent it from occurring? <br />3-What do you use to splice the sections together to be strong and minimize encrouchment on clearance of the lower level?
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