The invention is directed to a support system for roof formworks providing greater stability to the system while facilitating the assembly and disassembly. More particularly, the invention is directed to a purlin with an anchoring system to a purlin holder, a purlin holder with an anchoring system to a head, a head with a seat for purlins, a head with an overlapping accessory for purlin holders and a distance fixer for purlins.
Different support systems for roof formworks are known in the current state of the art, wherein elements are used with the intention of providing stability to the system while facilitating the assembly and disassembly thereof by the operators.
As for the joint between purlins and purlin holders, there are systems in which the ends of the purlins have terminals in order to be anchored on top of the purlin holders, such as the ones shown in documents ES2266434T3 or ES2269006A1. In them, however, it is not possible to install the purlin holders at a distance different from the one fixed beforehand by the length of the purlins, since these are configured to rest only on the terminals thereof. In the systems in which this is possible, as shown in document FR2760482A1, what is complicated is removing the purlins from the purlin holders without damaging the supported panels of the formwork at all, since the purlins are not designed to be pivoted with respect to the anchoring point thereof without moving upwards.
As for the joint between the purlin holders and the heads of the posts, there are systems wherein the ends of the purlin holders have terminals in order to be anchored to the heads by tilting them from a level lower than the heads. However, it is either not possible to place the purlin holders from above the head, as shown in document EP0751268A2, it is very expensive to position purlins with different lengths, such as the one shown in document US2018334818, or they result in terminals that are expensive to add to the purlin holders, like the ones shown in document KR101012088B1. Moreover, safety systems are known so that the purlin holders are not unintentionally released from the heads, such as the ones shown in documents CN105926932A or GB2065654A. However, these systems are complex to use and expensive to manufacture.
The need for purlin holders to overlap in the heads is also known, as shown in document KR201203729U. However, in this type of system it is difficult to place purlin holders is laborious, whether only one must be placed or two which are overlapping.
As for the stability of the system, there are elements which fix the distance between the purlin holders, such as the one shown in document US2018340342A1. However, this document does not indicate whether the configuration of the element enables the adjustment of the positioning thereof by itself.
Therefore, there is still a need for a system that is inexpensive to manufacture and that meets the requirements for robustness when used and is quick to assemble and disassemble.
The support system for roof formworks object of this invention comprises several elements which bring novelty to the application field thereof, all of these designed to contribute greater stability for the system while facilitating the assembly and disassembly thereof.
One of the elements of the system corresponds to a purlin, consisting of a beam defined by a profile comprising a flat lower surface so that it can rest on the upper surface of one or more purlin holders. The present purlin is characterised in that at least one end of the profile comprises a terminal, the base of which is defined by an inner corner adjacent to the profile and an outer corner longitudinally opposite from the previous one, the outer corner having a descending extension configured as a bearing point in a longitudinal slot of a purlin holder.
In turn, the system comprises a slotted purlin holder defined by a profile comprising a flat upper surface, characterised in that it comprises at least one slot in the longitudinal direction on the upper surface, suitable for receiving the descending extension of the terminal of the previous purlin.
This purlin and slotted purlin holder configuration offers an alternative support system for roof formworks, which is inexpensive to manufacture, enabling the operators to place the purlin in the slotted purlin holder from a level lower than the formwork, and which prevents the unintended detachment of the purlins once installed.
In a preferred embodiment of the purlin, it is the external edge of the descending extension which is defined in order to be the bearing point in the slot (i.e. it does not form a right angle, but rather an angle less than 90°), such that the purlin can be removed by pivoting it downwards with respect to said external edge. Thanks to this configuration, the upper end of the purlin does not rise when it is pivoted downwards, which prevents the movement of the supported formwork. At the same time, in this preferred embodiment, the extension has sufficient length so as to have the space necessary to remove the purlin from the slotted purlin holder by pivoting it downwards without needing to raise the supported formwork. This length, therefore, is linked to the depth and to the width of the slot, as well as to the distance from the slot to the side surface of the purlin holder.
In an even more preferred embodiment of the purlin, the length of the extension is such that, in the resting condition thereof in said slot, the lower surface of the profile is at the same level as the upper surface of the purlin holder, while the terminal has a groove in the lower face thereof, transverse to the longitudinal direction of the profile and located between the inner corner and the outer corner, the depth and width dimensions of which enable there to be the necessary space in order to remove the purlin from the slotted purlin holder without needing to raise the supported formwork. Thanks to this configuration, the space for removing the purlin from the slotted purlin holder is still provided without raising the supported formwork, while enabling the purlin to be at the same height in the case that the lower surface of the profile needs to rest on the upper surface of the slotted purlin holder, and not the terminal, leaving a section of the purlin cantilevered.
In a possible improvement of the previous embodiments of the purlin, the upper corner of the outer face of the terminal is rounded, such that the removal of the purlin without raising the supported formwork is further facilitated.
As an option, the base of the terminal, or at least the supporting extension, has a width larger than the base of the profile, with the intention of offering greater stability when resting on the slotted purlin holder.
As for the slotted purlin holder, a preferred embodiment may comprise two longitudinal slots in the entirety of the upper surface, suitable to enable receiving two purlins aligned with each other, one on each side of the slotted purlin holder.
In order to position purlins in a transverse position with each other, the system may comprise slotted purlin holders comprising at least one terminal with an upper extension projected in the shape of a hook, configured to rest when in use in the slot of the slotted purlin holder described initially, the latter being adjacent to said terminal and in a transverse position, the upper surfaces of both purlin holders having the same height.
Another element that the system may comprise, in combination with the purlins and slotted purlin holders described above, consists of a head for posts, of the type comprising support elements for the purlin holders, characterised in that it comprises at least one supporting seat for the terminals of the purlins, consisting of a slotted surface or with a height difference or a stop flange, positioned at a height with respect to the support elements for purlin holders such that when in use the seat provides continuity, as a bearing point of said terminals, for the slots of the previous purlin holders. In this manner, the system enables the purlins to be positioned even in the heads, wherein the purlin holders are interrupted.
Another element of the present system consists of a distance fixer for the distance between purlin holders which is self-adjusting, defined by a profile comprising at least two lower slots intended to receive two parallel purlin holders, the distance of which is to be fixed, the slots being transverse to the longitudinal direction of the profile, being characterised in that the width of the slots in the entrance area thereof is larger than that of the purlin holders, while it is decreasing as the slot goes further into the profile to a width smaller than that of the purlin holders. Thanks to the self-adjusting configuration of the slots, the present fixer enables the distance between the purlin holders to be fixed (and therefore helps to stabilise the formwork support system) without needing to place it precisely and without needing the purlin holders to be at a precise distance. Preferably, the height of the fixer is sufficiently reduced so that, when in use, it does not come in contact with the panels of the formwork, such that it is only the purlins that support them.
A transcendental element of the present system consists of a head for posts of the type comprising a horizontal support surface for purlin holders, which extends from two of the opposite sides of the head, the head being characterised in that it comprises two cylindrical crossbeams, parallel to each other, in a horizontal position, symmetrical with respect to a middle plane of the head and fastened to the horizontal support surface above the ends thereof. Linked to this head, the system comprises a purlin holder resting on the head, characterised in that it has at least one terminal, the base of which is defined by an inner corner adjacent to the profile and an outer corner longitudinally opposite from the previous one, each corner having a descending extension, which are at a suitable distance in order to fit one of the crossbeams of the head therebetween and with a very reduced clearance, the external descending extension of one crossbeam being such that it is the only bearing point of the purlin holder in said head.
Thanks to this configuration of a head and a purlin holder, it enables the installation to have a very reduced clearance of the latter in the head, either by tilting it from a level lower than the head or placing it horizontally from above.
In a preferred embodiment, the head can comprise a column collinear to the post and a mechanism for decoupling and lowering it along the column, such as those already known in the state of the art, in order to enable the descent of the horizontal support surface, as well as the crossbeams joined thereto. This facilitates the disassembly of the purlins and the purlin holders without needing to remove the posts.
In turn, this head can also combine the horizontal support surface for purlin holders with at least one supporting seat for purlins comprised in the head described above. In this case, the horizontal support surface for purlin holders can be joined to the seat, such that the lowering mechanism can also lower the purlins supported thereon. In a possible embodiment, the seat can be joined to the horizontal surface by means of plates located at corresponding lateral ends. In another possible embodiment, the seat and the horizontal surface can be joined by means of a profile or by means of several plates which join corresponding internal perimeters surrounding the column.
With respect to the purlin holder resting on the head, the end of the external extension is preferably chamfered or rounded, or ends in an angle less than 90° such that the contact area on the horizontal surface of the head is reduced.
Another possible component of the system consists of a head for posts, of the type comprising support elements for purlin holders, a column collinear to the post, the height of which exceeds that of the purlin holders and a mechanism for lowering said support elements along said column. This head is characterised in that it comprises at least one set of automatic holding means for a purlin holder, formed by a rod, either rigid or semi-rigid, with a substantially vertical upper section, the upper end of which is joined to the column at a height greater than that of the purlin holders, optionally in a manner that is tilting in comparison to the vertical plane coinciding with that of the purlin holder, and with a substantially horizontal lower section, positioned slightly above the purlin holder and linked to a deformable pushing element which enables it to move towards the column when a purlin holder presses it so as to be placed in the support element thereof and at the same time forces it to move away from the column once the purlin holder has been placed so as to be located above it.
In a possible embodiment of this head, the pushing element can consist of a spring-type element fastened to the column. In another possible embodiment, the pushing element may consist of a second rod placed on the other side of the column in a symmetrical manner, the corresponding lower sections being joined, either crossing through the column or on the side thereof, such that the very weight or the very elastic nature of the rods is what exerts the force in order to recover the resting positions thereof once the purlin holder has been placed.
Regardless, this last head can include any of the features of the heads described above.
Another possible head of the system consists of one that, comprising at least one support element for a purlin holder, is characterised in that it comprises an overlapping accessory of a second purlin holder, consisting of at least one platen joined to the side of said support element, comprising a support surface configured to support the second purlin holder in a parallel position and at the same height that the first purlin holder would be at in the support element thereof. In this manner, the adjustment in length of the alignments of purlin holders is enabled without needing to have purlin holders with different lengths.
In a preferred embodiment, this overlapping accessory comprises a lateral retainer for the purlin holder, consisting of an ascending flange located at the end of the platen. Likewise, the overlapping accessory can also comprise at least one ascending projection configured to be introduced into at least one complementary hole located on the lower face of the second purlin holder.
Both this latter head and the purlin holder able to be overlapped with the hole complementary to the projection can respectively comprise the features of the heads and the purlin holders described above.
These and other features and advantages of the system object of the present invention will be evident in light of the description of a preferred, but not exclusive, embodiment which is illustrated by way of non-limiting example in the drawings which are attached.
As shown in
As seen in the detail shown in
As seen in the detail shown in
Another element present in the system consists of a head for posts (3) whereon one or two slotted purlin holders (2) rest, which, in this preferred embodiment, comprises two seats (31) for the terminals (12) of the purlins (1), one on each side of the head. As seen in the detail of
This embodiment of head (3) in turn comprises a horizontal support surface (32) for the purlin holders (2), which extends from two of the opposite sides of the head (3), as well as two cylindrical crossbeams (33), parallel to each other, in a horizontal position, symmetrical with respect to a middle plane of the head (3) and fastened to the horizontal surface (32) above the ends thereof. In this embodiment, the seats (31) and the crossbeams (33) are joined to the horizontal surface (32) by corresponding lateral ends.
Likewise, this embodiment of head (3) comprises a column (34) collinear to the post supporting it and a mechanism (4) for decoupling and lowering the horizontal surface (32), as well as the seats (31) and the crossbeams (33), since they are joined to each other.
This embodiment of head (3) is linked to slotted purlin holders (2) resting on the head (3), as seen in
This head (3), as seen in
This embodiment of head (3) in turn comprises an overlapping accessory (35) for purlin holders, being slotted purlin holders (2) in this embodiment. This overlapping accessory (35) consists of a platen (36) joined to the side of the horizontal surface (32), comprising a support surface (37) configured to support an overlappable purlin holder (2′) in a parallel position and at the same height as another purlin holder (2) supported by the horizontal surface (32). This embodiment of overlapping accessory (35) also comprises an ascending projection (38) configured to be introduced into one of the complementary holes (27) located on the lower face of the overlappable purlin holder (2′), which can be seen in
Finally, as shown in
Next, possible claims of the elements and of the system described above, which complement those indicated in the claims section, are added as an option for possible divisional applications.
The details, shapes, dimensions and other accessory elements of the present invention may be conveniently replaced by others that are technically equivalent without departing from the scope defined by the claims included below.
Number | Date | Country | Kind |
---|---|---|---|
19382826.6 | Sep 2019 | EP | regional |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/ES2020/070575 | 9/25/2020 | WO |