Abstract: A collapsible hoisting device for use in the construction of large metal containers and to a removable accessory applicable thereto. It facilitates construction procedures by reducing project times and costs. The collapsible device includes a column (2) along which respective upper bodies (6) and lower bodies (7) that have been inserted into said column (2) move. The bodies (6, 7) are linked by an extendable means (8). The upper bodies (6) and lower bodies (7) have a corresponding mechanism to lock or attach (9) to the column (2), The column (2) is mounted so that it pivots with respect to a base (1) and the upper body (6) has a housing (609) suitable for the insertion of a removable, fingernail-shaped accessory (12).

Abstract: The invention relates to a method for building cylindrical structures, preferably made of metal, on the basis of the construction methods referred to as “a method which begins the assembly by the top structure”, which provides high levels of safety in the various steps to be carried out. The method uses a shaping device for shell sheets, at least one stationary cabin for vertically aligning and welding sheets, movable cabins for horizontally welding the inside and outside, and supporting base devices which in combination provide a safe and comfortable working environment for the operators, as well as greater speed and finish quality for the tank to be built, even under harsh weather conditions.

Abstract: A collapsible hoisting device for use in the construction of large metal containers and to a removable accessory applicable thereto. It facilitates construction procedures by reducing project times and costs. The collapsible device includes a column (2) along which respective upper bodies (6) and lower bodies (7) that have been inserted into said column (2) move. The bodies (6, 7) are linked by an extendable means (8). The upper bodies (6) and lower bodies (7) have a corresponding mechanism to lock or attach (9) to the column (2), The column (2) is mounted so that it pivots with respect to a base (1) and the upper body (6) has a housing (609) suitable for the insertion of a removable, fingernail-shaped accessory (12).