Light alloy body structure, particularly for transport vehicles, and a process for its formation

A light alloy body structure having a longitudinal extension, a widthwise extension and an upward extension, particularly for transport vehicles, including a top structure having opposite composite longitudinal side edge longeron members, opposite side wall structures fixed respectively on said composite longitudinal side edge longeron members, a front wall structure and a rear wall structure, wherein said composite side edge longeron members comprise each a first and a second elongated shaped hollow box section member having each a reinforcing inner cross-piece like web, a mating longitudinal edge surface on each of said box section members facing each other and having longitudinally extending mating tongue and groove formations for rapid assembling and for rigid mutual connecting therewith, said first shaped hollow box section member having a generally arcuated cross-section with an upper and a lower portion, said upper portion extending in alignment with said top structure and being rigidly connected therewith thereby to form a rigid unit therewith, said lower portion extending in alignment with the respective side wall structure and being rigidly connected therewith thereby to form a rigid unit therewith and means for rigidly connecting said front wall structure and said rear wall structure with said opposite side wall structures.