ITBO20090498A1 - JUNCTION SYSTEM FOR PREFABRICATED PILLARS IN CLS - Google Patents

Description

Attachment 2

DESCRIPTION

of industrial invention entitled:

JOINT SYSTEM FOR PILLARS

PREFABRICATED IN CONCRETE

The invention is inherent in the field of construction and relates to prefabricated load-bearing structures in approx.

State of the art: the prefabricated pillars currently on the market are mainly used for the industrial and tertiary sectors and are often characterized by the presence of support shelves at the top. Those used in residential construction usually have a series of irons in the lower pillar that extend so as to fit into the upper pillar and vice versa and are subsequently made integral by means of an integrative casting or use of epoxy resins or similar.

The technical problem that we intend to solve is to create a prefabricated pillar for mainly residential use that allows you to create a rigid node that complies with current anti-seismic regulations.

The invention consists in the fact that each prefabricated pillar has longitudinal reinforcement bars on the ends closed with an inclined slot in such a way as to allow the comb insertion of the prefabricated pillar that goes above on what goes below. It is also characterized by the presence of a movable centering iron in order to facilitate the alignment of the upper pillar on the lower one.

The presence of the metal tubular allows the perfect alignment of the upper and lower pillars and the staggered bars, together with the tubular, create a support that supports the pillar during casting.

The perfect verticality and orthogonality of the pillar is obtained by placing metal wedges under the side bars. Once the positioning of the pillar has been completed, the four vertical bars are welded in the four external corners of the pillars, making the pillar absolutely safe. The verticality of the pillars is thus guaranteed even in the event of large accidental impacts without the need for any provisional shoring.

The first drawing (fig.A) shows a typical pillar in axonometry (1) the reinforcement bars with closed bracket (2) inclined according to the actual needs of the project and the lower alignment bar (3) are visible

The second drawing (fig.B) shows two elevations of a type pillar (1), the hole (4) for housing the bar (3) and the slightly inclined reinforcing rods can be seen dashed.

The third drawing (fig. C) shows two elevations of the assembled pillar (1). The pillars are made integral by the casting at the level of the floor (5).

The fourth drawing (fig.D) shows the section of the pillar (6).

The single pillar is industrially made in the following way: the steel cage is arranged inside the horizontal formwork, making the overlapping of the bars in the middle of the pillar itself. After inserting a template, an innocenti type tube or similar is inserted in the head and tail of the cage in order to prepare the centering holes of the pillars; the concrete is then poured. Before the complete hardening of the concrete, the pipes are extracted. In the upper hole a steel tube is inserted, while in the other a corrugated tube is drowned which exits on the external lateral face of the pillar which will have the function of allowing the casting of expansive conglomerate inside the hole once the overlying and underlying pillar will be placed in position and the centering tube of the upper pillar has been inserted into the hole of the lower one.

This product can be prefabricated in the factory or on site. It allows to realize measurements, height and cross sections without limits of shape and size by joining the bars in the central part of the pillar where there are less tensions.

This system guarantees very simple installation thanks to the self-centering iron and the provisional vertical hold of the upper pillar since the brackets of the pillars rest on the concrete.

The verticality of the pillar and the coplanarity of the facades are preordered with simple metal wedges.

Once the correct positioning of the pillar has been completed, carried out with alignment wires, we proceed with a light welding of the vertical bars in the four external corners of the pillars, placing the structure in absolute safety.

To make the internal tubular integral with the structure and close the internal hole, the floor completion casting is made, taking care to leave a couple of centimeters of detachment from the base of the upper pillar, then proceed with the grouting of the two centimeters, creating a border such as to retain the jet inside but to allow air to escape; the expanding conglomerate is then cast inside the corrugated tube.

The verticality of the pillars is guaranteed even in the event of major accidental impacts without the need for any provisional shoring.

It should be noted that the bars of the beams pass inside the closed bracket slots of the pillars. The two structures therefore become extremely integral in the casting phase

Claims (4)

Attachment 3 CLAIMS Relating to an industrial invention entitled: JOINT SYSTEM FOR PILLARS PREFABRICATED IN CONCRETE 1) Procedure for joining prefabricated pillars characterized by the fact that the reinforcement bars are slotted at the ends of the pillars. 2) Process as in the preceding claim, characterized in that a movable centering element is inserted inside one of the ends of the pillar in order to facilitate the alignment and assembly procedures of the pillars. 3) Process as in the previous claim, characterized in that the positioning of the slanted slotted bars allows to realize a comb support which supports the structures in the casting phase. 4) Procedure as in the previous claim characterized by the fact that the positioning of the slanted slotted bars and the insertion of the bars of the beams inside them makes the column-beam node monolithic.