Cone for formwork tie rod (form tie)
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Cone to make your own tie rods when building a form for a concrete wall
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Model information
- Source
- Printables
- Category
- Outdoor & Garden
- License
- Creative Commons — Attribution — Noncommercial
When building the form for concrete walls, form ties are used to fix the sides at the exact thickness of the wall. (https://www.concrete.org.uk/fingertips/form-ties/, https://allform.se/formstag-8-mm-jarn/)
If you want to anchor the form ties to wall, look here https://www.printables.com/model/1443268-formwork-tie-rod-wall-anchored-form-tie
Additional materials needed are electrical PVC pipes, 6-8mm threaded rods, nuts and large washers. After the form is disassembled, the PVC pipes are left in the wall.
The PVC pipes should have an inner diameter of 13.8 mm to fit tightly on the cone, I used these https://www.biltema.se/bygg/elinstallationer/installationsror/vp-ror-16-mm-x-2-m-2000062797. Cut the pipe in to lengths of the thickness of the wall minus 40 mm (each cone builds 20 mm). Assemble as shown in pictures.
Special version “for split form panels” (Don't use this if you don't need it):
I needed to make a form where parts of it could be assembled after pouring stared (to access tricky spaces with the vibrator), i.e. needed to add a panel behind some ties that where already mounted in the form.
This version of the cone is more rigid to be able to take more abuse but also slightly bevelled so that, with the nuts slightly loosened, a panel can be slid in behind the cone. The downside is that it the bevel makes this cone more difficult to remove when dismantling the form.
