It depends on how the balcony slab is supported.
If it is only supported on one side against the floor slab, it is necessary for both it and the balcony slab to be cast simultaneously so that the reinforcement at the top of the balcony slab can be extended into the floor slab. This results in a restraint due to the cantilever moment that is converted from tension to compression via the ridges on the reinforcement bars.
However, the design is not recommended in terms of long-term loading causing a permanent and increasing deflection at the front edge of the balcony slab.
You also need to consider the thermal bridge created by the reinforcement bars even if, for instance, you can thermally insulate the edge of the balcony slab from the floor slab with cork.
If it is supported along three sides, the balcony slab can be considered free-standing and any clamps are more about anchoring against sliding, so the balcony slab does not slip off the supports due to temperature changes, etc., rather than clamps that should absorb a restraining moment. Such clamps can, in their simplest form, consist of an L-iron that is drilled into the edge of the floor slab with an expansion bolt, where the balcony slab rests on the lower flange, which is in turn attached underneath with an expansion bolt in the balcony slab. The holes in the lower flange can then be elongated to allow the slab to move under the influence of temperature changes, etc. The balcony slab and floor slab can then also be cast separately.
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Byggaren
