The method comprises mounting a lower jig (2) adapted to define on one side a floor for laying the flooring and on the opposite side, which faces the runway (VA) as support of the sliding guide of the doors of the elevator system. The method also comprises mounting of an upper crosspiece (1) which can be anchored aligned on said lower jig (2) and fall prevention rails (3) which can be mounted between said lower jig (2) and said upper crosspiece (1). Said mounting carried out before laying the floor of a respective landing (PT) ensures perfect centering of the different openings, and subsequent modular infill of the runway.
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