Formwork tie rod, wall anchored (form tie)
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Cone to make your own tie rods when building a wall-anchored form for pouring concrete
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Cone to make formties when anchoring a form to a wall. The rod is split inside the code so that no metal is exposed to the elements after the cone is removed and the void is filled in.
If you are building a freestanding wall look here https://www.printables.com/model/1354477-cone-for-formwork-tie-rod-form-tie
Additional materials is a 35-40mm long M8 coupling nut (e.g. https://www.amazon.se/dp/B08GLL1XZX?ref=ppx_yo2ov_dt_b_fed_asin_title), a M8 threaded rod, a large washer and a common M8 nut.
In the pictures there are also a nut locking the cone in place from the inside, this is optional.
If the coupling nut is longer than 40mm it sticks out and will be stuck in the concrete and difficult to remove afterwards. There are code for 11,5mm nuts, as the Amazon ones above, or the more common 13mm nut.
Insert the coupling nut in the cone. Anchor the rod in the wall and cut it so that end is in the middle of the long nut when the cone is where you want the form to be. Screw in the the rest of the rod into the long nut from the other end. Now you can fix the form at a precise distance from the wall with a washer and a nut.
When the concrete has set, remove the cone with the coupling nut together with the outer rod and fill in the remaining hole.
