Specifiche di progettazione e costruzione per piattaforme e passerelle
La norma di riferimento per le specifiche di progettazione e costruzione per piattaforme e passerelle è la EN 14122-2.
Di seguito viene riportato un estratto della norma con le indicazioni specifiche per il tipo di applicazione.
4.2.5 Design and construction for working platforms and walkways
The schedule of specifications for the working platforms and walkways shall state the load for which it is designed.
To determine the design load, at least the following shall be taken into account:
- the number of persons at work on the specific location;
- the mass of the tools, spare parts, and work equipment needed on location;
- the strength of impact on the structure due to a drop of tools and/or machine (replacement) parts;
- the possible concentrated loads due to the weight distribution (geometrics) of the used parts needed at the work;
- the weight due to environmental causes (e.g. fluids, water, snow, ice, spili, etc.) that can be deposited at the location of work on the platform.
The minimum loads to take into account for walkways and working platforms are as follows:
— 2 kN/m2 uniformly distributed load to account for the structure;
— 1,5 kN concentrated load applied in the most unfavourable position over an area of 200 mm x 200 mm of the floor.
When loaded with the design load, the deflection of the flooring shall not exceed 1/200th of the span.
When designing a walkway, the deflection under the dynamic loading shall also be taken into account.
Possible lateral movements of a platform in normal use shall not lead to loss of balance of the user of the platform or walkway.
The difference between the loaded and a neighbouring unloaded flooring shall not exceed 4 mm in height.
The safe strength and stiffness of design of the walkways and working platforms shall be verified either by calculation or by tests.