MULTIPLE REUSE CARDBOARD FORMS

Description

/ 5 “MULTIPLE REUSE CARDBOARD FORMS”

[001] - This utility model patent refers to a field of application in building engineering and, more specifically, in the area of ​​construction processes for molding concrete in the execution of pillars, walls and columns in civil construction works, consisting of a thin, lightweight, waterproof and resistant envelope that allows molding structural prismatic pieces with stability, safety and refined surface finish without generating debris or harming the environment and is fully recyclable.

[002] - In the market we find an immense quantity of types of concrete forms, ranging from forms made of wood to metal and other synthetic polymeric materials, and varying in terms of the amount of labor required for manufacturing, assembly and disassembly, as well as the auxiliary materials used in bracing and plumbing. Some of these forms generate disposable debris on the construction site, where large-scale pillars are molded "in situ" in a repetitive process that takes place from the basement and is repeated on each floor of the building. It is a succession of tasks to assemble, pour concrete, demold, and transfer the forms to the upper floor to support the new level.

[003] - Unlike the conventional construction process, in which the formwork is prepared and fixed in position to receive the insertion of the column reinforcement through the upper opening, this construction technique described in the present model provides for the installation of the formwork after the column reinforcement has been fixed with the reinforcement ties. Petition 870250074236, dated 08 / 21 / 2025, page 5 / 16 / 5 in the starters left in the previous concreting and fixed in the final position, where the cardboard form, consisting of two halves, covers the already fixed reinforcement, along the entire height of the pillar and is joined by tightening a few screws along two opposite lateral generatrices to close the form.

[004] - Once the assembly is complete, the forms need to be braced or secured to ensure proper positioning during concrete pouring. Handling, assembling, and securing the forms is a very quick process, allowing for removal as early as three days after concreting. The time required for assembling the column forms is a very important parameter in civil construction, due to the period of exposure to sun and rain, which causes random deformations that compromise leveling, plumbness, and squareness, requiring continuous manual review of alignments and leveling until the final concreting of the slab. As the building goes up, concreting a new slab requires the continued bracing of one or two previous slabs, and the cardboard forms for the columns are easily removed and transferred for reuse in new columns to support the new upper floor.

[005] - In the state of the art, BR 20 2023 020378-2 of 03 / 10 / 2023 describes multi-reuse cardboard forms, comprising the steps of sectioning the length of the integral cardboard form into two equal and symmetrical halves with internal lining of each half of the cardboard form with a waterproof blanket glued to 100% of the area. Petition 870250074236, dated 08 / 21 / 2025, page 6 / 16 / 5

[006] - Reusable cardboard forms have the main objective of providing form reuse, maintaining their quality characteristics in the surface and dimensional finish of the pillar, wall or column in successive concreting phases under conditions of safety, agility and, above all, economy, and are produced for this purpose to be used in this multiple reuse process to guarantee quality, deadline and cost.

[007] - The said form is assembled on site by two people by tightening a few screws, and easily positioned and fixed in the vertical position to receive the hose that will inject concrete with some predefined characteristics such as the “slamp” or slump between 8 and 14cm, sectioned longitudinally into (two) equal parts through precise and uniform cuts to be housed in a structural framework built in light steel or aluminum profiles, where the edges, both longitudinal and transverse, are waterproofed to receive the internal metal lining.

[008] The surface of the form on the inside of these segments receives the metal coating that is glued to 100% of the area and, after being perfectly accommodated in this segment of the structural framework, it is folded over the edges, at the lower, upper and lateral ends and fixed by screws, the extent of the fold is greater at the ends than on the sides, where the form, still open, has in this segment that receives an internal paint intended to facilitate the demolding, after the concreting of the structural element (pillar, wall, column, etc....). Petition 870250074236, dated 08 / 21 / 2025, page 7 / 16 / 5

[009] - The formwork is removed by loosening the fixing bolts and manually removing the segments of the structural framework, which is done by two or three people when the formwork is very high, greater than 4.5m, and the formwork segments, when disassembled, must be thoroughly cleaned to receive new internal paint to facilitate the formwork removal for the next concreting.

[010] - This reuse process allows the ends of the form (1 and 2) to be used either as the foot or as the top of the form without compromising the surface finish quality of the concreted element (3), unlike the conventional construction process, the construction technique described in this model speeds up, due to weight, handling, assembly, formwork removal and preparation for the next concreting, civil construction activities in the concreting of each floor of the building by up to 50%.

[011] - The proposed construction technique is innovative not only in its design, but also in its very well-planned systems, which are agile, flexible, easy to handle, fix, remove and prepare for reuse, and the process logistics provide for the number of forms necessary for a constructive sequence of the building's floors to optimize the reuse of each form, which has the potential for reuse up to fifteen cycles.

[012] - Reusable cardboard forms, the subject of this utility model patent, can be better understood by referring to the attached figures, which are part of this descriptive report and contain numerical references together with the Petition 870250074236, dated 08 / 21 / 2025, page 8 / 16 / 5 description of its technical particularities, figures which do not restrict its configuration regarding its dimensions, proportions and any types of finishes included, nor the scope of its practical application where: ^ Figure 1 represents a perspective view of how the structural framework is assembled for the (1) prismatic forms (rectangular and square); ^ Figure 2 represents a front view of how the structural framework for prismatic shapes (rectangular and square) is assembled; ^ Figure 3 represents a perspective view of how the structural framework for the circular shapes (2) is assembled; Figure 4 represents a front view of how the structural framework for circular shapes is assembled. [ 013] — These casings, after being filled with concrete to form very strong blocks, can be disassembled and reused, and are made up of prismatic elements fragmented into two parts for transport with simple manual assembly on the construction site where they will be used in successive concreting processes, through multiple reuses. Petition 870250074236, dated 08 / 21 / 2025, page 9 / 16

Claims

CLAIM 1 - MULTIPLE REUSE CARDBOARD FORMS”, comprises the steps of longitudinally sectioning the integral cardboard form into two equal and symmetrical halves with the construction of a metallic structural framework, fixing each half along the cut edges to the metallic framework, characterized by having the internal lining of each half of the cardboard form with a metallic coating glued to 100% of the area, and painting the internal surface of each half of the cardboard form with a release agent, being deformed three days after concreting, the demolding is carried out by removing the screws and moving the two halves (1 and 2) to be reused. Petition 870250074236, dated 08 / 21 / 2025, p. 10 / 16

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