EP4019714A1

EP4019714A1 - Metal section bar for an arch of a tent structure and related tent structure

Info

Publication number: EP4019714A1
Application number: EP21210567.0A
Authority: EP
Inventors: Massimo GNECCHI; Giovanni Girelli; Giuseppe Girelli; Pierangelo GIUSTACCHINI
Original assignee: G&G Partners SRL
Current assignee: G&G Partners SRL
Priority date: 2020-12-24
Filing date: 2021-11-25
Publication date: 2022-06-29
Also published as: IT202000032447A1

Abstract

A metal section bar (1) for an arch of a tent structure (100) comprises an upper wall (10), a lower wall (30), a right side wall (20) and a left side wall (40) which define an inner cavity (C) of the metal section bar (1). The metal section bar (1) comprises:
- a first channel (21) with an open annular section;
- a second channel (22) with an open annular section;
- a third channel (23) with an open annular section.

Description

This invention relates to a metal section bar for an arch of a tent structure and related tent structure.
Transportable tent structures of enormous dimensions are known in the art, for example tent structures that have a width of 10 meters up to 25 or 30 meters and a length that may reach 25 meters and more, such as military-type hangars or marquees for sheltering vehicles, helicopters, or airplanes.
In particular, generally such tent structures envisage a plurality of arches arranged in succession that serve as a support for the cover sheet of the tent structure. The arches are made of section bars that may be assembled on site and to which the cover that covers the roof and side walls is then attached. The arches, therefore, are generally carried or assembled on the site of installation of the tent structure and are raised by motorized mechanical means.
The metal section bars (beams and pillars) used for this type of tent structure are generally made in different, dedicated pieces, each intended to perform the action of pillar or beam. In addition, these section bars are pre-drilled in order to fasten purlins and bracing rods or other accessories for fastening electrical systems or auxiliary installations in predetermined positions.
Inconveniently, this implies that the aforementioned profiles, although of similar dimensions, are not interchangeable due to the holes made in a fixed and predetermined manner. Consequently, where it is necessary to change the position of the section bars due to unexpected needs at the time of installation, it is necessary to resort to onerous operations for modifying the section bars, for example drilling new holes, in conditions that are not always easy, as they are performed during the set-up phase.
Also disadvantageously, in the production phase of the section bar, if the holes are made incorrectly in a way that differs from what was planned, it is no longer possible to correct the error except by making additional holes or ovalizing those made, thus causing problems in the assembly phase due to a possible imperfect sealing of the holes.
An object of this invention is to propose a metal section bar for an arch of a tent structure and a related tent structure that are able to overcome the drawbacks of the prior art. In particular, one of the objects of this invention is to make a metal section bar for an arch of a tent structure of a tent structure and a tent structure that allow large tent structures, for example transportable in containers, to be installed directly in the field in a simplified manner, while at the same time being sufficiently flexible to allow installation in a more rapid manner and with a greater ability to adapt quickly and easily to changing weather conditions.
This object is achieved with a metal section bar for an arch of a tent structure and a related tent structure according to the attached independent claims. The dependent claims describe preferred or advantageous embodiments.
The features and the advantages of the metal section bar for an arch of a tent structure and the tent structure according to the invention shall be made apparent from the following description of preferred embodiments thereof, provided by way of non-limiting example, with reference to the accompanying figures, wherein:

Fig. 1 is an axonometric view of an embodiment of a tent structure in accordance with an embodiment according to this invention;
Fig. 2 is an axonometric sectional view of a metal section bar according to an embodiment of this invention;
Fig. 3 is an exploded view of a metal section bar according to an embodiment of this invention when used as a beam in a tent structure, in conjunction with a purlin;
Fig. 4 is an exploded view of a metal section bar according to an embodiment of this invention when used as a vertical upright in a tent structure;

With reference to the aforesaid figures, a tent structure, preferably a field tent structure, has been globally indicated with the reference numeral 100.
It is apparent that a field tent structure refers to any tent suitable for use in the military or civil defense for the construction of temporary hospitals or temporary shelter as personnel housing or as a command center, meeting room, field office, recreational tent for club or meeting, or laundry.
As best appreciated in Fig. 1, the tent structure 100 comprises a plurality of arch frames 101, 102, 103 that extend vertically for a predetermined height H relative to a support plane P. The arch frames 101, 102, 103 are spaced apart from each other along an extension direction K perpendicular to a vertical direction J and lying on the support plane P.
Each arch frame 101, 102, 103 comprises metal section bars 1, which are also the subject of this invention, joined together by means of assembly elements, i.e., joints. Each metal section bar 1 may be used within the arch frame as either a vertical upright component or an oblique beam component.
A plurality of purlins 9 are arranged between adjacent arch frames 101, 102, 103, which extend mainly along the extension direction K and are joined to adjacent arch frames to stabilize them to each other and to impart adequate structural support.
The metal section bar 1 for the tent structure arch 100 is described below in detail, with particular reference to Fig. 2, which shows an embodiment. The metal section bar 1 extends mainly along one of its longitudinal direction X and is preferably made by extrusion, preferably entirely of aluminum.
The metal section bar 1 is preferably made in one piece and comprises an upper wall 10, a lower wall 30 a right side wall 20 and a left side wall 40 defining an inner cavity C of the metal section bar 1. The upper wall 10 is joined in one piece to the left side wall 40 and to the right side wall 20 and is arranged opposite and apart from the lower wall 30.
Moreover, each metal section bar 1 comprises a first channel 21 having an open annular section that extends mainly along the longitudinal direction X. Said first channel 21 is obtained on the right wall 20 or in the vicinity of the joining region between the right wall 20 and the upper wall 10, on the side opposite the inner cavity C, for example in a corner of the metal section bar 1.
In addition, the metal section bar 1 comprises a second channel 22 having an open annular section that extends mainly along the longitudinal direction X. Said second channel 22 is formed on the right wall 20 or in the vicinity of the joining region between the right wall 20 and the lower wall 30, on a side opposite the inner cavity C.
A third channel 23 with an open annular section, extending mainly along the longitudinal direction X, is obtained on the right wall 20, on the side opposite the inner cavity C, and is interposed between the first channel 21 and the second channel 22, in the transverse extension direction Y perpendicular to the longitudinal direction X. The third channel 23 is also spaced between the first 21 and the second channel 22. Preferably, the first 21, the second 22 and the third channel 23 all run parallel to each other along the longitudinal direction X.
The first 21, the second 22, and the third channel 23 are each suitable for receiving an enlarged edge portion 51, 61, 71 of a respective cover sheet 5, 6, 7 in such a way that the enlarged edge portion 51, 61, 71 is slidably insertable into the respective channel 21, 22, 23 in a direction parallel to the longitudinal direction X. Further, in this manner, the enlarged edge portion 51, 61, 71 is constrained to remain in each respective channel 21, 22, 23 when stressed in the other spatial directions perpendicular to the longitudinal direction X.
The metal section bar 1 further comprises a first technical groove 24 with an open section and a second technical groove 25 with an open section extending mainly along the longitudinal direction X.
Said first 24 and second technical groove 25 are obtained on the right wall 20, on the side opposite the inner cavity C, i.e., with the open section on the side opposite the inner cavity C. Further, said first 24 and second technical groove 25 are spaced apart from each other and interposed between the first 21 and the second channel 22 or between the second 22 and the third channel 23.
Said first 24 and second technical grooves 25 are each suitable for receiving a respective coupling portion 240', 250' of a fastening element 240, 250 for a purlin 9, for example the head of a screw or pin, in such a way that the coupling portion 240', 250' is slidably insertable into the respective technical groove 24, 25 in a direction parallel to the longitudinal direction X. Further, in this manner, the coupling portion 240', 250' is constrained to remain in each respective technical groove 24, 25 when stressed in the other spatial directions perpendicular to the longitudinal direction X.
According to an embodiment, the metal section bar 1 also comprises a fourth channel 21' having an open annular section extending mainly along the longitudinal direction X. Said fourth channel 21' is obtained on the left wall 40 or in the vicinity of the joining region between the left wall 40 and the upper wall 10, on a side opposite the inner cavity C.
In this embodiment, a fifth channel 22' having an open annular section extends mainly along the longitudinal direction X and is also formed on the left wall 40 or in the vicinity of the joining region between the left wall 40 and the lower wall 30, on the side opposite the inner cavity C.
Further, the metal section bar 1 in this embodiment also comprises a sixth channel 23' with an open annular section extending mainly along the longitudinal direction X. Said sixth channel 23' is obtained on the left wall 20, on the side opposite the inner cavity C, and is interposed between the fourth channel 21' and the fifth channel 22'. Further, said sixth channel 23' is spaced apart from said fourth 21' and fifth channel 22'.
The fourth channel 21', the fifth channel 22' and the sixth channel 23' are each suitable for receiving an enlarged edge portion 51', 61', 71' of a respective cover sheet 5', 6', 7' in such a way that the enlarged edge portion 51', 61', 71' is slidably insertable into the respective channel 21', 22', 23' in a direction parallel to the longitudinal direction X and in such a way that the enlarged edge portion 51', 61', 71' is constrained to remain in each respective channel 21', 22', 23 when stressed in the other spatial directions perpendicular to the longitudinal direction X.
Preferably, the enlarged edge portion 51, 61, 71, 51', 61', 71' is formed by folding an edge portion of the sheet fabric back on itself to form a pocket that receives a piece of cable to produce the enlarged or bulbous cross section. The enlarged edge portion 51, 61, 71, 51', 61', 71' is axially inserted into one of the channels with an open annular section.
Preferably, the enlarged edge portion 51, 61, 71, 51', 61', 71' is a channel formed with the fabric of the sheet within which a cable is inserted, preferably a cable made of a plastic or elastomeric material that is more rigid than the material of the sheet, or a metal cable.
A particular example of such a type of enlarged edge portion 51, 61, 71, 51', 61', 71' is Keder's "Two Flap" design manufactured by the U.S. company Keder, Inc. of Rindge, N.H.
According to an embodiment, the metal section bar 1 also comprises a third technical groove 24' having an open section and a fourth technical groove 25' having an open section extending mainly along the longitudinal direction X. Said third 24' and fourth technical grooves 25' are formed on the left wall 40, on the side opposite the inner cavity C, i.e., with the open section on the side opposite the inner cavity C.
Said third 24' and fourth technical groove 25' are spaced apart and interposed between said fourth 21' and fifth channel 22' or between said fifth 22' and sixth channel 23'.
The third 24' and fourth technical grooves 25' are further suitable for each receiving a respective coupling portion 240"', 250"' of a fastening element 240", 250" for a purlin 9, for example the head of a screw or a pin, such that the coupling portion 240"', 250'" is slidably insertable into the respective technical groove 24', 25' in a direction parallel to the longitudinal direction X and in such a way that the coupling portion 240'", 250'" is constrained to remain in each respective technical groove 24', 25' when stressed in the other spatial directions perpendicular to the longitudinal direction X.
According to an embodiment, the metal section bar 1 comprises one or more upper technical grooves 11, 12 with an open section extending mainly along the longitudinal direction X. Said one or more upper technical grooves 11, 12 are formed on the upper wall 10, on the side opposite the inner cavity C, i.e., with the open section opposite the inner cavity C.
The upper technical grooves 11, 12 are each suitable for receiving a respective coupling portion 110', 120' of a fastening element 110, 120 for a technical accessory, for example the head of a screw or a pin for attaching a support plate for an accessory outside the tent structure, such that the coupling portion 110', 120' is slidably insertable into the upper technical groove 11, 12 in a direction parallel to the longitudinal direction X. Further, the coupling portion 110', 120' is constrained to remain in each respective upper technical groove 11, 12 when stressed in the other spatial directions perpendicular to the longitudinal direction X, precisely due to the shape of the section of the groove.
According to an embodiment, the metal section bar comprises one or more lower technical grooves 31, 32 with an open section, which extend mainly along the longitudinal direction X. Such lower technical grooves 31, 32 may be present either by themselves or together with the upper technical grooves 11, 12.
The lower technical grooves 31, 32 are formed on the lower wall 30, on the side opposite the inner cavity C, i.e., with the open section on the side opposite the inner cavity C.
The lower technical grooves 31, 32 are each suitable for receiving a respective coupling portion of a fastening element for a technical accessory, such as the head of a screw or a pin for coupling a support plate for an accessory inside the tent structure, in such a way that the coupling portion is slidably insertable into the lower technical groove 31, 32 in a direction parallel to the longitudinal direction X and in such a way that the coupling portion is constrained to remain in each respective lower technical groove 31, 32 when stressed in the other spatial directions perpendicular to the longitudinal direction X.
Preferably, the first 21, the second 22 and the third channel 23 have a cross section, i.e., a section along a plane perpendicular to the longitudinal direction X, in a "C" shape or in an open circular shape.
Preferably, the first 24 and second technical grooves 25 have a cross section, i.e., a section along a plane perpendicular to the longitudinal direction X, substantially in the shape of a screw head.
Preferably, the first 21, second 22, and third channels 23 and/or the fourth 21', fifth 22', and sixth 23" channels extend longitudinally substantially along the length of the metal section bar in the longitudinal direction X.
Preferably, the first 24 and second technical grooves 25 extend longitudinally substantially along the length of the metal section bar in the longitudinal direction X.
Preferably, the third 24' and the fourth technical groove 25' extend longitudinally substantially along the length of the metal section bar in the longitudinal direction X.
Preferably, the upper technical grooves and/or the lower technical grooves extend longitudinally substantially along the length of the metal section bar in the longitudinal direction X.
According to a preferred embodiment, the metal section bar 1 has a quadrangular cross section, wherein the first 21 and fourth open channels 21' with an open annular section are arranged at two corners of the quadrangular section and wherein the second 22 and fifth channels 22' with an open annular section are arranged at the other two remaining corners of the quadrangular section.
According to the invention, the tent structure 100 thus comprises at least one cover sheet 5, suitable for being subjected directly to atmospheric agents, having an enlarged edge portion 51 inserted into the first channel 21 in such a way that the enlarged edge portion 51 is constrained to remain in the first channel 21 when stressed in the other spatial directions perpendicular to the longitudinal direction X.
Moreover, the tent structure 100 comprises at least a first inner cover sheet 6 or 7 having an enlarged edge portion 61 or 71 inserted into the second 22 or third channel 23 in such a way that the enlarged edge portion 61 or 71 is constrained to remain in the second or third channel 22, 23 when stressed in the other spatial directions perpendicular to the longitudinal direction X.
Further, the tent structure comprises at least one purlin 9 and at least one fastening element 240, 250 (generally a plurality of purlins and fastening elements) having a coupling portion 240', 250', such as a screw or a pin head, inserted into the first and/or second technical groove 24, 25 in such a way as to be constrained to remain in each respective technical groove 24, 25 when stressed at least in the spatial directions perpendicular to the longitudinal direction X.
According to a particularly advantageous embodiment, the tent structure 100 comprises at least a first inner cover sheet 6 having the enlarged edge portion 61 inserted into the third channel 23 and also a second inner cover sheet 7 having an enlarged edge portion 71 inserted into the second channel 22.
This allows for increased insulation, thereby reducing the impact of energy costs for heating and air conditioning in the tent.
Preferably, the tent structure also comprises a plurality of tension wires 91, 92, each attached to a respective arch frame by fastening means inserted into the upper technical grooves (11, 12), when the metal section bar is used, for example, as an upright of the arch frame.
Preferably, the arch frame 101, 102, 103, is constructed of a plurality of metal section bars 1 including vertical uprights 101' defining the vertical walls of the tent, a plurality of oblique beams 101" extending at an angle with respect to the vertical uprights and meeting at the apex 1000 of the tent 100. A plurality of purlins 160 extend longitudinally between the arch frames 10.
The arch frame 101, 102, 103 may be a free-span tent frame, without internal poles, or a full-span tent frame.
Preferably, the vertical uprights 101' are mounted on feet 116, which rest on the plane P on which the tent structure 100 is constructed. Preferably, during installation, the feet 116 allow the vertical uprights 101' to be rotated from a horizontal position to a vertical position.
Preferably, the tent structure 1 may further comprise strands at predetermined locations extending between the various structural elements to provide greater support and stability to the structure.
It is clear that, in this discussion, "open annular" or "C" shape has been intended to mean a shape or arrangement that has a mouth leading to an enlarged cavity. The mouth is restricted relative to the enlarged cavity and provides an undercut arrangement so that an enlarged object within the enlarged cavity cannot be pulled, without deformation, through the mouth.
The channels 150, 151, 152, 153 are used to engage the enlarged edge portion 21.
Innovatively, the metal section bar 1 according to this invention allows the drawbacks associated with the prior art to be resolved. In particular, due to the synergistic presence of channels that allow for the quick insertion of up to three sheets and the technical grooves for fastening the purlins, it is possible to position the purlins as desired along the entire length of the section bar, due to the variable sliding of the fastening elements along the entire length of the section bar, and at the same time the sheets may be inserted independently.
Moreover, due to the possibility of moving the fastening elements for the purlins, even in the case of erroneous positioning, it is possible to remedy said erroneous positioning without any drilling or further maintenance, as it is sufficient to slide the fastening elements (for example the screw heads) along the technical grooves.
Additionally, the presence of the technical grooves makes it possible to increase the presence of purlins or bracing rods at any time during the life cycle of the tent structure, even after it has already been deployed, for example to increase the support of greater operating loads (e.g., to compensate for a sudden snowfall).
Advantageously, due to the technical grooves in the lower wall 30, it is possible to fasten reinforcing struts, for example between a vertical upright and a beam in the vicinity of slope changes, on the inside of the tent structure, as well as horizontal ropes or chains to support snow loads, without the need for additional drilling and using the same structure of the arch.
Moreover, due to the technical grooves on the lower wall 30, it is possible to fasten the bracing rods in such a way that they are under all the sheets, i.e., facing the inner compartment of the tent structure and, therefore, "visible" (i.e. neither placed between the sheets, nor arranged above the sheet closest to the inner compartment of the tent structure), thus allowing a constant view of said bracing rods and their tensioners from inside the tent structure. This provides greater safety through easier inspections as well as greater simplicity in performing inspections.
Advantageously, moreover, due to the presence also of lower technical grooves, it is possible to fasten cables, bracing rods, or reticular structures at will inside the arch to increase the support of additional loads.
Moreover, due to the extreme flexibility in positioning the sheets and fastening elements of the purlins, it is possible to use a beam element instead of a pillar element, without onerous operations of further drilling, but rather only by moving the fastening elements along the technical grooves.
Moreover, advantageously, it is possible to choose whether to insert only one or two inner sheets, in addition to the outer one, in order to obtain the maximum versatility of insulation according to the climatic conditions. Moreover, having two possible channels in which to insert the inner sheet, in the case of installation with only one inner sheet, it is possible to choose the thickness of the gap between the outer sheet and the inner sheet, thus offering further versatility in the choice of insulation.
A person skilled in the art may, in order to meet specific needs, make several changes to the embodiments of the invention described above or substitutions of elements with other functionally equivalent ones.
These variants are also contained within the scope of protection as defined by the following claims.

Claims

A metal section bar (1) for an arch of a tent structure (100), said metal section bar (1) mainly extending along a longitudinal direction (X) and comprising an upper wall (10), a lower wall (30), a right side wall (20) and a left side wall (40) which define an inner cavity (C) of the metal section bar (1), said upper wall (10) being joined in one piece to the left side wall (40) and right side wall (20) and being arranged opposing and spaced apart from the lower wall (30),
wherein said metal section bar (1) comprises:
- a first channel (21) with an open annular section which mainly extends along the longitudinal direction (X), said first channel being obtained on the right wall (20) or in the vicinity of the joining region between the right wall (20) and the upper wall (10), on the opposite side with respect to the inner cavity (C);

- a second channel (22) with an open annular section which mainly extends along the longitudinal direction (X), said second channel (22) being obtained on the right wall (20) or in the vicinity of the joining region between the right wall (20) and the lower wall (30), on the opposite side with respect to the inner cavity (C);

- a third channel (23) with an open annular section which mainly extends along the longitudinal direction (X), said third channel (23) being obtained on the right wall (20), on the opposite side with respect to the inner cavity (C), and being interposed between the first channel (21) and the second channel (22) and being spaced apart from said first (21) and second (22) channels;

wherein the first (21), the second (22) and the third (23) channels are suitable for each receiving an enlarged edge portion (51, 61, 71) of a respective cover sheet (5, 6, 7) so that the enlarged edge portion (51, 61, 71) is slidably insertable into the respective channel (21, 22, 23) in a direction parallel to the longitudinal direction (X) and so that the enlarged edge portion (51, 61, 71) is constrained to remain in each respective channel (21, 22, 23) when urged in the other spatial directions perpendicular to the longitudinal direction (X);

wherein said metal section bar (1) further comprises a first technical groove (24) having open section and a second technical groove (25) having open section which mainly extends along the longitudinal direction (X), said first (24) and second (25) technical grooves being obtained on the right wall (20), on the opposite side with respect to the inner cavity (C), i.e., with the open section on the opposite side with respect to the inner cavity (C),

said first (24) and second (25) technical grooves being spaced apart from each other and being interposed between the first (21) and the second (22) channels or between the second (22) and the third (23) channels,

and wherein said first (24) and second (25) technical grooves are suitable for each receiving a respective coupling portion (240', 250') of a fastening element (240, 250) for a purlin (9), for example the head of a screw or a pin, so that the coupling portion (240', 250') is slidably insertable into the respective technical groove (24, 25) in a direction parallel to the longitudinal direction (X) and so that the coupling portion (240', 250') is constrained to remain in each respective technical groove (24, 25) when urged in the other spatial directions perpendicular to the longitudinal direction (X).
Metal section bar (1) according to claim 1, comprising:
a fourth channel (21') with an open annular section which mainly extends along the longitudinal direction (X), said fourth channel (21') being obtained on the left wall (40) or in the vicinity of the joining region between the left wall (40) and the upper wall (10), on the opposite side with respect to the inner cavity (C);
- a fifth channel (22') with an open annular section which mainly extends along the longitudinal direction (X), said fifth channel (22') being obtained on the left wall (40) or in the vicinity of the joining region between the left wall (40) and the lower wall (30), on the opposite side with respect to the inner cavity (C);

- a sixth channel (23') with an open annular section which mainly extends along the longitudinal direction (X), said sixth channel (23') being obtained on the left wall (20), on the opposite side with respect to the inner cavity (C), and being interposed between the fourth channel (21') and the fifth channel (22') and being spaced apart from said fourth (21') and fifth channel (22');

wherein the fourth (21'), the fifth (22') and the sixth channel (23') are suitable for each receiving an enlarged edge portion (51', 61', 71') of a respective cover sheet (5', 6', 7') so that the enlarged edge portion (51', 61', 71') is slidably insertable into the respective channel (21', 22', 23') in a direction parallel to the longitudinal direction (X) and so that the enlarged edge portion (51', 61', 71') is constrained to remain in each respective channel (21', 22', 23') when urged in the other spatial directions perpendicular to the longitudinal direction (X).
Metal section bar (1) according to claim 2, further comprising a third technical groove (24') open section and a fourth technical groove (25') open section which mainly extends along the longitudinal direction (X), said third (24') and fourth (25') technical grooves being obtained on the left wall (40), on the opposite side with respect to the inner cavity (C), i.e. with the open section on the opposite side with respect to the inner cavity (C),
said third (24') and fourth (25') technical grooves being spaced apart from each other and being interposed between the fourth (21') and the fifth (22') channels or between the fifth (22') and the sixth (23') channels,

and wherein said third (24') and fourth (25') technical grooves are suitable for each receiving a respective coupling portion (240"', 250"') of a fastening element (240", 250") for a purlin (9), for example the head of a screw or a pin, so that the coupling portion (240"', 250"') is slidably insertable into the respective technical groove (24', 25') in a direction parallel to the longitudinal direction (X) and so that the coupling portion (240"', 250"') is constrained to remain in each respective technical groove (24', 25') when urged in the other spatial directions perpendicular to the longitudinal direction (X).
Metal section bar (1) according to any one of the preceding claims, comprising one or more upper technical grooves (11, 12) having open section, which mainly extend along the longitudinal direction (X), said one or more upper technical grooves (11, 12) being obtained on the upper wall (10), on the opposite side with respect to the inner cavity (C), i.e. with the open section on the opposite side with respect to the inner cavity (C),
said one or more upper technical grooves (11, 12) being suitable for each receiving a respective coupling portion (110', 120') of a fastening element (110, 120) for a technical accessory, for example the head of a screw or a pin for coupling a supporting plate for an accessory external to the tent structure, so that the coupling portion (110', 120') is slidably insertable into the upper technical groove (11, 12) in a direction parallel to the longitudinal direction (X) and so that the coupling portion (110', 120') is constrained to remain in each respective upper technical groove (11, 12) when urged in the other spatial directions perpendicular to the longitudinal direction (X).
Metal section bar (1) according to any one of the preceding claims, comprising one or more lower technical grooves (31, 32) having open section, which mainly extend along the longitudinal direction (X), said one or more lower technical grooves (31, 32) being obtained on the lower wall (30), on the opposite side with respect to the inner cavity (C), i.e. with the open section on the opposite side with respect to the inner cavity (C),
said one or more lower technical grooves (31, 32) being suitable for each receiving a respective coupling portion of a fastening element for a technical accessory, for example the head of a screw or a pin for coupling a supporting plate for an accessory inside the tent structure, so that the coupling portion is slidably insertable into the lower technical groove (31, 32) in a direction parallel to the longitudinal direction (X) and so that the coupling portion is constrained to remain in each respective lower technical groove (31, 32) when urged in the other spatial directions perpendicular to the longitudinal direction (X).
Metal section bar (1) according to any one of the preceding claims, wherein the first (21), the second (22) and the third (23) channels have a cross-section, i.e., a section perpendicular to the longitudinal direction (X), having a "C" shape or an open circular shape.
Metal section bar (1) according to any one of the preceding claims, wherein the first (24) and the second technical groove (25) have a cross-section, i.e., a section perpendicular to the longitudinal direction (X), having a substantially screw head shape.
Metal section bar (1) according to any one of claims 2 to 7, having a quadrangular cross-section, wherein the first (21) and the fourth (21') channels with an open annular section are arranged at two corners of the quadrangular section and wherein the second (22) and fifth (22') channels with an open annular section are arranged at the other two remaining corners of the quadrangular section.
A tent structure (100) comprising:
- a plurality of arch frames (101, 102, 103) which vertically extend for a predefined height (H) with respect to a support plane (P), said arch frames (101, 102, 103) being arranged spaced apart from one another along an extension direction (K) which is perpendicular to a vertical direction (J) and lying on the support plane (P), wherein each arch frame (101, 102, 103) comprises metal section bars (1) according to any one of claims 1 to 8, joined to each other by means of assembly elements,

- at least one outer cover sheet (5) suitable for being directly subjected to the atmospheric agents, having an enlarged edge portion (51) inserted in the first channel (21) so that the enlarged edge portion (51) is constrained to remain in the first channel (21) when urged in the other spatial directions perpendicular to the longitudinal direction (X);

- at least one first inner cover sheet (6, 7) having an enlarged edge portion (61, 71) inserted in the second (22) or third channel (23) so that the enlarged edge portion (61, 71) is constrained to remain in the second or third channel (22, 23) when urged in the other spatial directions perpendicular to the longitudinal direction (X) ;

- at least one purlin (9) and at least one fastening element (240, 250) having a coupling portion (240', 250'), for example the head of a screw or a pin, wherein the coupling portion (240', 250') is inserted in the first and/or in the second technical groove (24, 25) so that it is constrained to remain in each respective technical groove (24, 25) when urged at least in the spatial directions perpendicular to the longitudinal direction (X).
Tent structure (100) according to claim 9, comprising:
said at least one first inner cover sheet (6), having an enlarged edge portion (61) inserted in the third channel (23) and a second inner cover sheet (7) having an enlarged edge portion (71) inserted in the second channel (22) .