Method and installation for the manufacture of a beam.

Abstract

The invention relates to a method for manufacturing a beam (1) in the form of a truss (2) assembled to a sheath (10) filled with an insulating material (7), which truss is formed of an upper bar (3) and two lower bars (4, 5) connected by a reinforcement (6), said lower bars being inserted into a recess (11) in the sheath having an insertion opening (110), the spacing (L) between said lower bars at rest being greater than the width (D) of said opening, the insertion of the two lower bars being carried out by the steps of: - positioning the truss opposite the opening, - temporarily deforming the truss so as to bring the lower bars closer together until their spacing becomes less than the width of the opening, - translating the truss thus deformed towards the opening to insert the lower bars into the recess. Figure to be published with the abbreviation: Fig. 1

Description

Title of the invention: Method and installation for the manufacture of a beam. Technical field.

[0001] The invention relates to a method for manufacturing a beam. It also relates to an installation for implementing the method that is the subject of the invention.

[0002] It relates to the technical field of building and supplies for building construction, and more specifically to the manufacture of beams for floors or roofs. State of the art.

[0003] Beams are known to exist in the form of a truss consisting of a longitudinal top bar and two longitudinal bottom bars connected by welded metal reinforcement. It is also common practice to encase the bottom bars of the truss in a concrete footing. During the manufacture of the beams, and in order to create the concrete footing, it is practically necessary to construct formwork, that is, to build a form around the bottom bars into which the concrete is then poured.

[0004] The formwork is subsequently dismantled after the concrete base has completely dried. However, these operations of assembling, drying, and dismantling the formwork are costly in terms of time and labor. Furthermore, during the use of a floor constructed with joists, the joists are subjected to significant bending stress, and the concrete base tends to exhibit abnormal tensile stress and develop micro-cracks. In addition, this type of metal joist is heavy and difficult to handle on a construction site.

[0005] French patent document FR2862994 is known, in which the concrete base encasing the lower bars has been replaced by an insulating material. Replacing the concrete with an insulating product does not compromise the mechanical strength of the beam, but allows for beams that are more insulating, lighter, and less expensive. As before, the beam is in the form of a truss consisting of a longitudinal upper bar and two longitudinal lower bars connected by welded reinforcement. These beams also incorporate a sheath arranged around the lower steel bars. This sheath serves both as formwork or a container for the insulating product during the beam's manufacture, and as a protective sheath for said insulating product. The sheath is in the form of a single-piece U-shaped profile with inward-facing flaps at its upper end.

[0006] Patent document FR3127772 describes a method for manufacturing a beam in which the assembly of the truss and the duct comprises the steps of rotating the truss through an angle α of at least 10°, the upper bar forming the axis of rotation of the truss, said rotational tilting forming the forward tilting; then moving the truss so that the first lower bar enters the duct housing; then rotating the truss through an angle α of at least 10°, the first lower bar forming the axis of rotation of the truss, this rotational tilting then forming the return tilting so that at the end of said return tilting the second lower bar is disposed in the duct housing.

[0007] The process described in document FR3127772, however, requires rotations of the lattice which can be complex to automate and which can significantly increase production times.

[0008] The invention aims to remedy this situation. In particular, the invention aims to achieve all or part of the following objectives: simplify the insertion of the mesh into the sheath so that the automation of the beam manufacturing process is faster; reduce the production costs of the beams; increase the production capacity of the beams. Presentation of the invention.

[0009] The solution proposed by the invention is a method for manufacturing a beam in the form of a lattice assembled to a sheath filled with an insulating material, which lattice is formed of an upper bar and two lower bars connected to each other by a reinforcement, said lower bars being inserted into a housing of the sheath, which housing has an insertion opening, the spacing between said lower bars at rest being greater than the width of said opening.

[0010] The insertion of the two lower bars is carried out by the steps of: -positioning the lattice opposite the opening; - temporarily deforming the lattice so as to bring the lower bars closer together until their spacing becomes less than the width of the opening; - translating the lattice thus deformed towards the opening to insert the lower bars into the housing.

[0011] This method significantly reduces the need for complex physical manipulation of the truss compared to the method described in document FR3127772, which requires rotating the truss at various angles to insert the bottom bars into the sleeve. Bringing the bottom bars closer together facilitates their insertion into the housing, without requiring complex rotations. This simplifies the insertion process, as only a translation of the truss is required. The manufacturing process is thus faster and easier to automate, thereby reducing the production costs of the beams.

[0012] Other advantageous features of the invention are listed below. Each of these features may be considered alone or in combination with the features defined above. Each of these features contributes, where appropriate, to the resolution of specific technical problems defined further in the description and in which the features defined above do not necessarily participate. Thus, the following features may, where appropriate, be the subject of one or more divisional patent applications:

[0013] According to one embodiment, the method comprises the steps of: - placing a guide at the level of the opening, which guide has a flared cross-section whose narrowed part is located at the level of said opening; - positioning the lattice in the guide; - translating the lattice in the guide in the direction of the opening, so that by sliding on sliding walls of said guide, the lower bars come together, reducing the spacing between said lower bars to allow their insertion into the housing through said opening.

[0014] According to one embodiment, the narrowed part of the guide has a width less than or equal to the width of the opening so that when the lower bars reach said opening, their spacing is less than or equal to said width.

[0015] According to one embodiment, by sliding on the sliding walls, the lower bars move closer together and simultaneously exert a spreading force on fins delimiting the opening so as to increase the width (D) of said opening.

[0016] According to another embodiment, the step of deforming the lattice consists of temporarily pinching said lattice to exert pressure on both sides of said lattice, which pressure is defined to bring the lower bars closer together so that their spacing becomes less than the width of the opening.

[0017] Another aspect of the invention relates to an installation for manufacturing a beam in the form of a lattice assembled to a sheath filled with an insulating material, which lattice is formed of an upper bar and two lower bars connected to each other by a reinforcement, said lower bars being inserted into a housing of the sheath, which housing has an insertion opening, the spacing between said lower bars at rest being greater than the width of said opening.

[0018] This installation includes: - a means of positioning the lattice opposite the opening; - a means of temporarily deforming the lattice so as to bring the lower bars closer together until their spacing becomes less than the width of the opening; - a means of translating the lattice thus deformed towards the opening to insert the lower bars into the housing.

[0019] According to one embodiment, the means for temporarily deforming the truss is a guide placed at the opening and in which said truss translates. This guide has a flared cross-section, the narrowed portion of which is located at said opening. The guide has sliding walls on which the lower bars slide. These sliding walls are configured to bring said lower bars closer together during the translation of the truss in said guide, and to reduce their spacing to allow their insertion into the housing.

[0020] According to one embodiment, the narrowed part of the guide has a width less than or equal to the width of the opening so that when the lower bars reach the opening, their spacing is less than or equal to said width.

[0021] According to one embodiment, reinforcement elements are installed around the guide.

[0022] According to one embodiment, the sheath is installed in a rigid frame or chassis.

[0023] According to one embodiment, the narrowed part of the guide is provided with a or several attachment elements in the form of notches or lugs configured to engage with return fins delimiting the opening.

[0024] According to one embodiment, by sliding on the sliding walls, the lower bars exert a spreading thrust on the fins, the frame or rigid chassis being shaped to contain the spreading of said fins.

[0025] According to another embodiment, the means for temporarily deforming the lattice is a clamp actuator whose jaws constrain the sides of said lattice to bring the lower bars together until their spacing becomes less than the width of the opening. Brief description of the figures.

[0026] Other advantages and features of the invention will become more apparent upon reading the description of a preferred embodiment which follows, with reference to the accompanying drawings, which are provided by way of illustrative and non-limiting examples and on which:

[0027] [Fig-1] is a schematic front view, or view along a transverse section plane, of a beam obtained according to the manufacturing process of the invention, comprising the portion forming the lattice and the portion forming the sheath housing the insulating material.

[0028] [Fig.2] is a schematic side view of the beam shown in [Fig. 1].

[0029] [Fig.3] illustrates the positioning of the mesh opposite the opening of the duct.

[0030] [Fig.4] illustrates a first embodiment of the invention, the mesh being positioned in the flared part of a guide placed at the level of the opening of the sheath.

[0031] [Fig.5] illustrates the temporary deformation of the lower bars when the truss reaches the narrowed part of the guide of [Fig.4].

[0032] [Fig.6] illustrates the lower bars installed in the sheath once they have passed the narrowed part of the guide in Figures 4 and 5.

[0033] [Fig.7] and [Fig.8] illustrate a variant of the first embodiment where the bars lower ones exert a spreading force on fins of the sheath.

[0034] [Fig.9], [Fig. 10] and [Fig. 11] illustrate a second embodiment of the invention, in which the lattice is deformed by pinching to bring the lower bars closer together. Description of the implementation methods.

[0035] Where appropriate, and to possibly supplement their current definition, the following clarifications are provided for certain terms used in the claims and the description:

[0036] - As used herein, unless otherwise indicated, the possible use of adjectives Ordinals "first", "second", etc., to describe an object or stage simply indicate that different occurrences of similar objects or stages are being mentioned and do not imply that the objects or stages so described must be in any given sequence, whether in time, space, ranking, or any other way.

[0037] - "X and / or Y" means: X alone or Y alone or X+Y.

[0038] - Generally speaking, it will be appreciated that on the various attached drawings, the Objects can be drawn arbitrarily to facilitate their reading.

[0039] In [Fig. 1], the beam 1 comprises a truss 2 formed of a top bar 3 connected to two lower steel bars 4, 5 (first lower bar 4 and second lower bar 5) by means of a reinforcement 6. The bars 3, 4, 5 and the reinforcement 6 are preferably made of steel. However, other materials such as composites, reinforced polymers or carbon fibers may be considered.

[0040] The bars 3, 4, 5 may have a round, square, rectangular, hexagonal, oval, or any other profile suitable to a person skilled in the art. They all have substantially equal lengths. The reinforcement 6 securely connects the upper bar 3 to the lower bars 4, 5. In one embodiment, the reinforcement 6 is in the form of two steel bars bent in a general sinusoidal shape, as illustrated in [Fig. 2].

[0041] The assembly of the bars 3, 4, 5 and the reinforcement 6 can be carried out manually by operators at an assembly station, or automatically or semi-automatically using articulated arms, clamps, welders, or any other automated system suitable for the skilled tradesperson. In practice, the bars 3, 4, 5 are arranged so as to have substantially the same longitudinal orientation, the lower bars 4, 5 being arranged in a horizontal plane and the upper bar 3 also being arranged in a horizontal plane above said lower bars, so as to form a truss 2 whose profile (or cross-section) has a general isosceles triangle shape. Two bars bent sinusoidally, each forming a Part of the reinforcement 6 are arranged between one of the lower bars 4, 5 and the upper bar 3. The assembly is finalized by welding bars 3, 4, 5 onto the reinforcement 6.

[0042] Once assembled, the mesh 2 can be automatically conveyed by a conveyor, forklift, mobile cart, or other means to a mesh storage facility. Such a facility may, for example, be a rack on which meshes are stored according to their dimensions, reference number, intended use, or any other storage criteria suitable for those skilled in the art. The mesh storage facility may be automated and equipped with: - an input station incorporating a means for measuring or weighing the incoming mesh 2; - a manipulator arm, conveyor, or other means for storing the mesh 2 in a defined location; - an output station where the manipulator arm picks up the outgoing mesh.

[0043] As shown in Figures 1 and 2, the beam 1 also includes a sheath 10 arranged around the lower bars 4, 5 and in which an insulating material 7 is arranged.

[0044] This sheath 10 is preferably made of steel, although other materials such as composites, reinforced polymers, or carbon fibers may be considered. The sheath 10 advantageously takes the form of a one-piece U-shaped profile whose configuration is defined by a bottom wall and two parallel side walls extending perpendicularly (or substantially perpendicularly, i.e., at 90° ± 10°) to said bottom wall, from its ends. It includes a housing 11 into which the lower bars 4, 5 are inserted. This housing 11 has an insertion opening 110 delimited by two return fins 1101, 1102. These fins each extend perpendicularly (or substantially perpendicularly, i.e. at 90° ± 10°) to one of the lateral walls of the duct 10, from the free end of said wall, and are oriented towards each other.

[0045] The sheath 10 can be formed by extrusion through a die, or obtained by bending or profiling a sheet metal strip, etc. In the case of profiling, and to ensure continuous production, the sheet metal strip will be continuous and obtained from a sheet metal coil arranged on an uncoiler. The sheet metal is then unwound from the coil and passed through profiling heads, allowing the progressive bending of the sheet metal from its flat shape to its final shape. The profiling heads are formed by a set of profiling rollers and are distributed along a profiling station.

[0046] Once the sheath 10 is formed, it is automatically cut to the required length by shears or a mobile circular saw at a cutting station. Generally, this length is approximately equal to the length of the mesh 2 with which the sheath 10 is intended to be assembled, but may also be less than the length of the mesh 2 of a predefined length, for example 5 cm, 10 cm, 15 cm, or other.

[0047] For each duct 10 and mesh 2 conveyed from the respective warehouse to the assembly station, a dimensional or weight check can be performed to verify that no errors have been made by the warehouse or the operators. The dimensional check can be carried out using sensors such as optical sensors, strain gauges, etc. If the measured dimensions conform to the desired specifications, the duct 10 and mesh 2 are conveyed normally. If the measured dimensions do not correspond to the desired specifications, an error message is sent to the respective operator or warehouse so that the non-conforming mesh 2 or duct 10 can be replaced with a mesh or duct conforming to the desired specifications.The error message may be in the form of a message displayed on a screen, a beep or similar (audible warning) or information transmitted between the sensors allowing the control of dimensions and the PLC of the mesh store 2 or ducts 10.

[0048] According to one embodiment, the beam 10 includes one or more shims 12 intended to support the lower bars 4, 5 so that the latter 4, 5 are not in contact with the bottom wall of the duct 10. In order to maintain a space between the bottom wall of the duct 10 and the steel bars 4, 5 during the assembly of the beam 1, the method may thus consist of placing one or more shims 12 in the bottom of the housing 11, upon which the lattice 2 is intended to rest. In practice, the shims 12 are arranged transversely to the duct 10 and preferably have a length equal to or slightly greater than the width of the duct so as to be immobilized in the duct 10 by means of a snug or tight fit. The shims 12 may, however, have a length less than the width of said duct 10.They have a width of one or more centimeters (or a length corresponding approximately to that of the sheath 10 in the case where only one wedge is used) and a height of a few millimeters to a few centimeters. The wedge(s) 12 are preferably made of an insulating material such as polyurethane, polystyrene, or similar. The installation of the wedge(s) 12 is preferably carried out automatically, for example, using a manipulator arm.

[0049] Referring to [Fig. 3], the width “D” of the opening 110 is less than the spacing “L” between the two lower bars 4, 5 at rest. The width D is defined in particular by the distance separating the free ends of the two fins 1101, 1101 at rest, i.e., without stress. This width D can, for example, be measured when the duct 10 is stored in the duct magazine or when it is transported to the assembly station. The spacing L corresponds more precisely to the distance between the outer ends of the lower bars 4, 5 at rest, i.e., when the truss 2 is not subjected to any stress, for example, when it is stored in the truss magazine or when it is transported to the assembly station. A As an example, the width D is between 50 cm and 90 cm and the spacing L is between 70 cm and 120 cm.

[0050] The process of inserting the lattice 2 into the housing 11 of the duct 2 is, for example, carried out once the lattice 2 and the duct 10 have been transported to the assembly station. This insertion process consists of positioning the lattice 2 opposite the opening 110 and temporarily deforming said lattice so as to bring the lower bars 4, 5 closer together until their spacing becomes less than the width D of said opening. Thus deformed, the lattice 2 is translated towards the opening 110 to insert the lower bars 4, 5 into the housing 11. First embodiment: figures 4 to 8.

[0051] In this embodiment, a guide 8 is positioned at the opening 110. This guide 8 has a flared cross-section, the narrowed portion of which (i.e., the narrowest part and / or the portion opposite the flared portion) is located at the opening 110, and in particular between the fins 1101, 1102 when the duct 10 is equipped with them. The profile of the guide 8 thus gradually narrows towards the opening 110, its narrowed portion having a width less than or equal to the width D of said opening.

[0052] On [Fig.4], the flared part of the guide 8, or introduction part, is sufficiently wide to accommodate the lower bars 4, 5 in the initial configuration of the truss 2. The width of this flared part is equal to, or preferably greater than, the spacing L between the two lower bars 4, 5 at rest.

[0053] The internal walls 80 of the guide 8 are sliding walls on which the lower bars 4, 5 slide. These sliding walls 80 can be straight or curved concavely or convexly. They can also have straight and curved portions. The slope and / or curvature of the walls 80 ensures a transition of the lower bars 4, 5 from their initially spread-out position ([Fig. 4]) to a close-coupled position ([Fig. 5]) compatible with the opening 110. In one embodiment, the slope of the walls 80 is between 45° and 70°, so as to be sufficiently gradual to allow easy and rapid insertion, minimizing friction without compromising the structural integrity of the truss 2. The choice of curvature is guided by the same considerations.

[0054] The guide 8 can be made of steel, composite, or any other material suitable to the person skilled in the art. The walls 80 can be coated with a coating to reduce friction and resist wear, such as a ceramic-based or reinforced polymer-based coating.

[0055] Once positioned in the guide 8, at the flared part, the lattice 2 is translated towards the opening 110 by means of an actuator 90, for example, a cylinder type. Another actuator or the same actuator 90 can be used to Position the lattice 2 in the guide 8, opposite the opening 110. In the attached figures, this translation is a vertical translation, or more generally a translation along the transverse axis of the opening 110. By sliding on the sliding walls 80, the lower bars 4, 5 approach the lattice 2 through elastic deformation, so that their spacing gradually decreases until it becomes less than or equal to the width D when they reach the opening 110. When they enter the housing 11 ([Fig. 6]), the lower bars 4, 5 are no longer constrained, so that through a shape memory phenomenon, they automatically return to their initial rest configuration, where their spacing L again becomes greater than the width D of the opening 110.

[0056] If necessary, after removing the guide 8, the lattice 2 can be moved so that the lower bars 4, 5 come to rest against the aforementioned wedges and / or are positioned symmetrically in the housing 11. This is then filled with the insulating material 7. Once the insulating material is dry, the beam is removed, for example to a palletizing station.

[0057] When the lower bars 4, 5 slide against the walls 80, there is a risk that the latter will spread apart under the effect of the thrust exerted by said bars and compromise the structural integrity of the duct 2. Therefore, according to one embodiment, reinforcing elements 91 are installed around the guide 8 to eliminate, or at least reduce, the deformations of the walls 80. In addition to or instead of the elements 91, the duct 10 can be installed in a rigid frame 92 or in a chassis, configured to prevent the spreading and / or deformation of the duct walls under the effect of the forces exerted by the guide 8 during the insertion of the lower bars 4, 5.

[0058] According to the embodiment illustrated by Figures 7 and 8, the effect of the spreading thrust exerted by the guide 8 during the insertion of the lower bars 4, 5 is used to spread the fins 1101, 1102 apart. The narrowed part of the guide 8 can be provided with one or more attachment elements 82, for example in the form of notches or lugs, configured to engage with the fins 1101, 1102. When the lower bars 4, 5 slide against the walls 80, the latter spread apart temporarily under the effect of the thrust exerted by said bars, causing the fins 1101, 1102 to spread apart ([Fig.8]). This spacing increases the width of the opening 110 and, combined with the bringing together of the lower bars 4, 5, facilitates the introduction of said bars into the housing 11.This type of embodiment is particularly advantageous when the difference between the spacing L and the width D is significant, for example greater than 20 cm.

[0059] When the lower bars 4, 5 enter the housing 11, the walls 80 of the guide 8 are no longer constrained, so that by a shape memory phenomenon, the fins 1001, 1102 automatically return to their initial position.

[0060] The rigid frame or chassis 92 in which the sheath 10 is installed can be shaped to contain the spacing of the fins 1101, 1102. It can, for example, have side walls 920 having an inclination corresponding to the desired spacing of the fins 1101, 1102. Second embodiment: figures 9 to 11.

[0061] In this embodiment, the lattice 2 is temporarily pinched to exert pressure on both sides of said lattice. This pressure is defined to bring the lower bars 4, 5 closer together so that their spacing becomes less than the width D of the opening 110.

[0062] Clamping the mesh 2 can be achieved by means of a clamping actuator 93, for example pneumatic, hydraulic, or electric, allowing for a controlled and adjustable clamping force to be applied to different spacings of the lower bars 4, 5 and / or different types of mesh 2. In [Fig. 9], the jaws 930 of the clamp 93 constrain the sides of the mesh 2, particularly the reinforcement 6, for rapid and precise application of pressure to said mesh. The jaws 930 can be coated with soft materials to prevent damage to the mesh 2 during clamping.

[0063] With reference to [Fig. 9], the gripper actuator 93 can be used to position the lattice 2 opposite the opening 110. Before, during, or after this positioning, and as illustrated in [Fig. 10], the gripper 93 is activated to temporarily deform the lattice 2 and bring the lower bars 4, 5 closer together until their spacing becomes less than the width D of the opening 110. The lattice 2 thus deformed is translated in the direction of the opening 110 to insert the lower bars 4, 5 into the slot 11 ([Fig. 11]). The deformation of the lattice 2 and its translation towards the opening 110 can be carried out simultaneously, provided that the spacing of the lower bars 4, 5 reaches the required value at the moment they enter the slot 11.After releasing the clamp actuator 93, the lattice 2 is no longer constrained, so that through a shape memory phenomenon, the lower bars 4, 5 automatically return to their initial position.

[0064] The arrangement of the various elements and / or means and / or steps of the invention, in the embodiments described above, should not be understood as requiring such an arrangement in all implementations. In any event, it will be understood that various modifications may be made to these elements and / or means and / or steps, without departing from the spirit and scope of the invention.

[0065] Furthermore, one or more features described only in one embodiment can be combined with one or more other features described only in another embodiment. Similarly, one or more features described only in one embodiment can be generalized to other embodiments, even if this or these features are described only in combination with other features.

[0066] The use of the verb "comprise", "comprendre" or "include" and its conjugated forms does not exclude the presence of other elements or other steps than those stated in a claim.

[0067] In the claims, any reference sign in parentheses shall not be interpreted as a limitation of the claim.

Claims

Demands

1. A method for manufacturing a beam (1) in the form of a truss (2) assembled to a sheath (10) filled with an insulating material (7), said truss being formed of an upper bar (3) and two lower bars (4, 5) connected to each other by a reinforcement (6), said lower bars being inserted into a recess (11) of the sheath, said recess having an insertion opening (110) delimited by two return fins (1101, 1102) and having a transverse axis, the spacing (L) between said lower bars at rest being greater than the width (D) of said opening, characterized in that the insertion of the two lower bars (4, 5) is carried out by the steps of: - positioning the truss (2) opposite the opening (110), - temporarily deforming the truss (2) so as to bring the lower bars (4, 5) closer together 5) until their spacing becomes less than the width (D) of the opening (110),- translate, along the transverse axis of the opening (110), the lattice (2) thus deformed in the direction of said opening (110) in order to insert the lower bars (4, 5) into the housing (11).

2. A method according to claim 1, comprising the steps of: - placing a guide (8) at the opening (110), which guide has a flared cross-section whose narrowed part is located at said opening; - positioning the lattice (2) in the guide (8); - translating the lattice (2) in the guide (8) towards the opening (110), so that by sliding on sliding walls (80) of said guide, the lower bars (4, 5) come together, decreasing the spacing between said lower bars to allow their insertion into the housing (11) through said opening.

3. A method according to claim 2, wherein the narrowed part of the guide (8) has a width less than or equal to the width (D) of the opening (110) so that when the lower bars (4, 5) reach said opening, their spacing is less than or equal to said width (D).

4. A method according to claim 2 or 3, wherein, by sliding on the sliding walls (80), the lower bars (4, 5) move closer together and simultaneously exert a spreading force on fins (1101, 1102) delimiting the opening (110) so as to increase the width (D) of said opening.

5. A method according to claim 1, wherein the step of deforming the lattice (2) consists of temporarily pinching said lattice to exert pressure on both sides of said lattice, which pressure is defined to bring the lower bars (4, 5) together so that their spacing becomes less than the width (D) of the opening (110).

6. Installation for manufacturing a beam (1) in the form of a lattice (2) assembled to a sheath (10) filled with an insulating material (7), which lattice is formed of an upper bar (3) and two lower bars (4, 5) connected to each other by a reinforcement (6), said lower bars being inserted into a housing (11) of the sheath, which housing has an insertion opening (110) delimited by two return fins (1101, 1102) and having a transverse axis, the spacing (L) between said lower bars at rest being greater than the width (D) of said opening, characterized in that said installation comprises: - a means (90, 93) for positioning the lattice (2) opposite the opening (110), - a means (8, 93) for temporarily deforming the lattice (2) so as to bring the lower bars closer together (4, 5) until their spacing becomes less than the width (D) of the opening (110),- a means (90, 93) for translating, along the transverse axis of the opening (110), the lattice (2) thus deformed in the direction of said opening (110) in order to insert the lower bars (4, 5) into the housing (11).

7. Installation according to claim 6, wherein: - the means for temporarily deforming the lattice (2) is a guide (8) placed at the level of the opening (110) and in which said lattice translates, which guide has a flared cross-section whose narrowed part is located at the level of said opening; - the guide (8) has sliding walls (80) on which the lower bars (4, 5) slide, which sliding walls are configured to bring said lower bars closer together during the translation of the lattice (2) in said guide, and to decrease their spacing to allow their insertion into the housing (11).

8. Installation according to claim 7, wherein the narrowed portion of the guide (8) has a width less than or equal to the width (D) of the opening (110) such that when the lower bars (4, 5) reach the opening (110), their spacing is less than or equal to said width (D).

9. Installation according to one of claims 7 or 8, wherein reinforcing elements (91) are installed around the guide (8).

10. Installation according to any one of claims 7 to 9, wherein the sheath (10) is installed in a rigid frame or chassis (92).

11. Installation according to any one of claims 7 to 10, wherein the narrowed part of the guide (8) is provided with one or more attachment elements (82) in the form of notches or lugs configured to engage with return fins (1101, 1102) delimiting the opening (110).

12. Installation according to claim 11 taken in combination with claim 10, wherein by sliding on the sliding walls (80), the lower bars (4, 5) exert a spreading thrust on the fins (1101, 1102), the rigid frame or chassis (92) being shaped to contain the spreading of said fins.

13. Installation according to claim 6, wherein the means for temporarily deforming the lattice (2) is a clamp actuator (93) whose jaws (930) constrain the sides of said lattice to bring the lower bars (4, 5) together until their spacing becomes less than the width (D) of the opening (110).

Images