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Step 4Keep Stacking
Keep stacking and adjusting from front to back. Make sure both pillars take the same shape and are working towards aligning at the top. As you keep staking, add another board for support. Then more snow supports then another board as you see if. This will vary depending on the size of your arch.
Also, you can see that we've added some front to back supports. Our blocks were very wet and heavy and compressed a great deal, which led to some serious front to back movement. We added some front and back buttresses to add support. We needed this to make this thing stand. You may need it too.
VERY IMPORTANT
Be careful of hoop stress. Hoop stress is the outward force the arch sends due to the vertical weight on the curve. The goal is the properly direct all this stress into the ground. Do this by keep a smooth curve from the bottom of the curve to the top. If you have vertical sides on the lower portions of the pillars you will have increased hoop stress. If you have too much stress the arch will kick out the sides and collapse. Keep this in mind as you build.
Also, you can see that we've added some front to back supports. Our blocks were very wet and heavy and compressed a great deal, which led to some serious front to back movement. We added some front and back buttresses to add support. We needed this to make this thing stand. You may need it too.
VERY IMPORTANT
Be careful of hoop stress. Hoop stress is the outward force the arch sends due to the vertical weight on the curve. The goal is the properly direct all this stress into the ground. Do this by keep a smooth curve from the bottom of the curve to the top. If you have vertical sides on the lower portions of the pillars you will have increased hoop stress. If you have too much stress the arch will kick out the sides and collapse. Keep this in mind as you build.
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