Abstract: A scaffolding particularly designed for work inside large hollow elements (1) such as tanks, quarries, etc. The scaffolding comprises a supporting structure consisting of two struts (3) interconnected by at least two crossbars (4, 5) for forming the flooring and stiffening the whole scaffolding, modular platforms (6) projecting at varying heights from the outer surface of said struts (3), and members (7) providing access to said platforms and arranged in or near said struts (3). Said scaffolding may be used to lay insulators in methane tanks.