Keeping the formwork in Position

Once the formwork has been set up and put in position, it must be securely fastened.

There are various ways of doing this.

Big clamps and Large holes

The clamps are solid cross-pieces as thick as a rafter and provide a support for the boards of the formwork. With this type of clamp large holes appear in the rammed earth when the forms are removed. The clamps should ideally be slightly conical so that they can easily be removed without damaging the rammed earth. Planks can be used as scaffolding if the clamps project from the boards of the formwork.

Small clamps and small holes 

This system is based on concrete formwork technology. Threaded steel rods, concrete bars or flat iron bars can be used as clamps. Only small holes will appear when the forms are removed. The bars should be thick enough so that they can support the forms and avoid shearing the rammed earth.

Without clamps or holes

Independently gripping formwork - The boards are kept in place by a tensioning device or screw-locking system or locking hydraulic jacks.

Formwork on posts - To eliminate the risk of bulging walls, care must be taken that the distance between the posts is not too great.