The system comprises a structure comprising a crossbar (1) and a series of pillars (2) connected to the crossbar (1) by hinged joining means, and a fixing system to secure each pillar (2) to the crossbar (1), where the hinged joining means are configured to operate as the crossbar (1) is lifted from the ground, causing the pillars to be lifted (2) to a final position in which the fixing systems secure the pillars (2) to the crossbar (1) in a stable position.
