We have a new download available on our Formwork Downloads page – Doka form-ties for special requirements.
This User Information booklet (Method Statement) is aimed at everyone who will be working with the Doka form-ties for special requirements. It contains information on how to set up this system, and on correct, compliant utilisation thereof.
To pour walls, it is necessary to have wall-ties with sufficient load-bearing capacity. In general, a distinction is made between:
● wall-ties where no special requirements are made – these only need sustain the pressure of the fresh concrete – and
● wall-ties for special requirements that are fulfilled by additional measures aimed at making the tie-points e.g.:
This manual offers ideas and suggested solutions for form-tie points that need to meet one or more of the requirements stated above.
● Choosing a suitable formwork system with a widely spaced form-tie pattern is one way of reducing the number of expensive wall-ties that are needed. This will, of course, depend upon the circumstances and requirements applying on each site.
● If the main sealing function is intended to be in the middle of the wall (in the same way as with joint-sealing tape), this has the advantage that the form-tie point is watertight from the moment the formwork is stripped.
● Sealing measures that are carried out on the outside only, e.g. by bonding, call for extremely skilled, painstaking work.
● Tie-holes with small conical openings are more pleasing to the eye (fair-faced concrete) and easier to close off.
● In order to ensure that the wall-tie fulfils the requirements made of it, the points below must be followed, regardless of which design variant is selected: – the wall-tie must be precisely defined in the tendering documents – the relevant regulations and standards must be observed – the manufacturer’s installation instructions must be followed – the personnel involved must be sufficiently skilled.