Cutting
- As the pipes are effectively cylinders, you need to make an opening so that they can be joined. When cutting out the cardboard tubes, add a few cms to the sides (côtes) listed in the tables e.g. to join a 100mm tube onto a 100mm one, the depth of the opening is 5cm. For thick carton, cut it with a saw (a good way of doing this is with a jigsaw) and a cutter.
- Use the dimensions in the tables as shown.
Assembly
- Wrap the tubes individually in protective plastic.
- Position the tubes relative to one another as depicted in the diagrams.
- Hold the tubes in place with gaffer tape.
Be careful to ensure the junctions are well covered so that the concrete does not soak into the tubes.
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