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lengthofspiralring
Without information on the precision of the measurement, the only thing that can be said is the max length is 115 cm.
the dia meter of the pile is 750mm the pitch of the sprial rings are 100mm and how to calucualte the lentngth of the rod for the one meter lkength of pile.
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1. Calculate the length of the pile multiplied by the area of the circle of the tube i.e. pi times radius squared times length of pile. This will be a m2 unit. This gives you your tube for the pile, next we calc. the whole of bulb end using a similar calc. then take away the straight cylinder part. This will be a m2 unit. 2. calculate the average width (diameter) of bulb section. for example if it goes from a max of 3 metres down to 1 meter, the average is 2 metres. therefore the calc. will be : pi times 1 squared times length of bulb. Then to get just the extra bulb volume take the cylinder part of the bulb away. This will be a m2 unit. 3. You then have to add an "Extra value" measurement on for creating the bulb section. This is a No. unit.