EP2628869B1 - Device for connecting prefabricated structures for building construction - Google Patents

Description

The invention relates to the construction of buildings and more particularly to a device for the connection of prefabricated structures.

BACKGROUND OF THE INVENTION

It is known, for example from the document JP5179677 or DE 24 41 262 A1 , to connect prefabricated structures using connecting devices. After the bonding of the prefabricated structures, a binder, such as cement, is generally introduced between the adjacent edges of the prefabricated structures so as to securely join them to each other.

OBJECT OF THE INVENTION

An object of the invention is a means for limiting the time required for setting up the connection device between the prefabricated structures.

SUMMARY OF THE INVENTION

• le positionnement des deux structures préfabriquées de manière que les bordures évidées des structures préfabriquées respectives soient adjacentes ;
• le positionnement d'un dispositif de liaison comportant plusieurs parties mobiles les unes par rapport aux autres, ces parties mobiles étant respectivement assemblées en différents points d'assemblages s'étendant le long de moyens de limitation d'écartement de ces points d'assemblages, certaines de ces parties mobiles pénétrant au moins partiellement à l'intérieur de la bordure évidée rectiligne de l'une des structures préfabriquées et certaines autres de ces parties mobiles pénétrant au moins partiellement à l'intérieur de la bordure évidée rectiligne de l'autre des structures préfabriquées ;
• on introduit dans les évidements des bordures évidées adjacentes et autour des parties mobiles pénétrant dans ces bordures évidées, un liant fluide apte à se solidifier, tel que du ciment, de manière à réaliser entre les structures préfabriquées et à l'intérieur de leurs évidements adjacents une armature entourée du liant.

To this end, according to the invention, there is provided a method of manufacturing an assembly comprising two prefabricated structures each comprising at least one rectilinear recessed edge, the method comprising successively:

• positioning the two prefabricated structures so that the recessed edges of the respective prefabricated structures are adjacent;
• the positioning of a connecting device comprising several moving parts relative to each other, these moving parts being respectively assembled at different assembly points extending along spacing limiting means of these assembly points, some of these movable portions penetrating at least partially within the straight recessed edge of one of the prefabricated structures and some other such movable portions penetrating at least partially within the straight recessed edge of the other structures prefabricated;
• recessed edges adjacent to and around the moving parts penetrating these recessed edges are introduced into the recesses, a fluid binder capable of solidifying, such as cement, so as to form between the prefabricated structures and within their adjacent recesses. a frame surrounded by the binder.

This method makes it possible to simply position, in adjacent recesses and opposite one another, prefabricated structures to connect together moving parts whose maximum spacing is determined simply by the means of limitation of the spacing of the points of assembly. The mobility of the moving parts relative to each other means at least a relative mobility of the moving parts relative to each other to reduce when necessary the overall width of the device. The relative mobility of the moving parts relative to each other is such that moving parts arranged to be able to penetrate into one of the borders, that is to say the rectilinear edge of one of the prefabricated structures, can come closer to other movable parts arranged to penetrate the other adjacent edges, that is to say the straight edge of the other prefabricated structures.

This relative approximation of the moving parts makes it possible to facilitate the positioning of the device between the borders of the structures since when some of the moving parts abut an object in a border, for example against a bottom of a border or a rod of reinforcement placed in the border, this mobile part can then retract at least in the direction of the width of the device, which amounts to locally reduce the overall width of the device.

In their various embodiments, the connecting devices according to the invention are arranged to be able to be positioned by sliding between the adjacent rectilinear recessed edges while a general direction of the device extends parallel to the borders and between these edges placed in a screw position. to screw.

For the understanding of the invention, the general direction of the device is the direction in which the length of the device extends (in the case of a deployable device, the length is measured when the device is deployed).

Once the moving parts positioned in the recesses of prefabricated structures, these structures are bonded together by casting a solidifiable binder around these moving parts.

It is found that the method according to the invention allows a saving of time for the assembly of prefabricated structures. Indeed, during the relative positioning of the structures to be assembled, the operator does not have to worry about the positioning of the connecting device of these structures, it can thus save time and precision in the relative positioning of the structures. Moreover, since the parts of the connecting device intended to penetrate at least partially into the recesses of the structures are movable relative to each other, the connecting device has a deformable character at its mobile parts which facilitates its positioning between the structures to be assembled. Due to this relative mobility of the moving parts, the connecting device has less tendency to lock when inserted between the structures. As indicated above, when a moving part abuts against one of the structures to be assembled, this part can be moved relative to the other moving parts allowing the rest of the device to continue its displacement in relation to the structures. Thus, when positioning the connecting device between the structures, the operator has less need to intervene to unlock the device.

The invention also relates to a connection device for implementing the method according to the invention.

Furthermore, in order to meet the aforementioned object of the invention, it is also proposed a connecting device for connecting two prefabricated structures having rectilinear recessed edges extending facing one another. This connecting device is defined by claim 7 attached.

The spacing limitation means are such that when the areas of the cable, connected to the limiting means, are spaced apart as much as possible from each other, this cable remains distended between its first and second ends. By "stretched between its ends" means that the cable can not be stretched from one end to the other between its ends.

The maximum spacing allowed by the spacer limiting means is such that the cable forms a plurality of loops disposed along the cable.

The loops formed by the cable distributed along its length in association with the limiting means maintaining these loops allow to introduce the loops inside the recesses of the adjacent rectilinear edges without the risk that these loops disappear by pulling the cable during its introduction. To perfect the connection, a binder is introduced into these recesses and, thanks to the loops of the cable, an armature is formed surrounded by the binder which extends between the prefabricated structures and inside their adjacent recesses. The connecting device according to the invention is particularly easy to implement because the flexibility of the cable allows the elastic deformation of the loops during the introduction of the device in the adjacent recesses of the prefabricated structures. This results in a saving of time and manpower for the establishment of the connecting device. In a particular embodiment of the invention, the cable is wound so as to form a spring comprising a plurality of turns, each of these turns having two loops opposite one another, these loops of the spring cable being said loops arranged for penetrate at least partially inside the hollowed edges. The spring effect of the cable is provided to tighten the loops and oppose the extension of the connecting device.

The fact that the cable is spring makes it easier to store.

It is also proposed according to the invention a kit comprising a connecting device according to the invention and a tool for extending the device of the invention to put it in place in recesses adjacent borders of prefabricated structures.

It is also proposed an assembly comprising two prefabricated structures and at least one connecting device according to the invention which is surrounded at least partially by a binder such as cement. Typically, this assembly according to the invention is a portion of a building such as a wall, a floor or a ceiling, or a wall connected to a floor or a wall connected to a ceiling.

• La longueur maximale du câble est la longueur totale du câble lorsqu'il est tendu entre ses extrémités et qu'il ne forme pas de boucles, c'est à dire lorsque les moyens de limitation ne limitent pas l'écartement des différentes zones du câble les unes par rapport aux autres ;
• Une boucle est une courbure du câble obtenue majoritairement par flexion du câble selon sa longueur. Une boucle ne doit pas être confondue avec une torsade du câble qui est obtenue majoritairement par torsion du câble sur lui-même. On note que le câble peut être à la fois bouclé et torsadé.

For the understanding of the invention, the following definitions are given:

• The maximum length of the cable is the total length of the cable when it is stretched between its ends and it does not form loops, that is to say when the limiting means do not limit the spacing of the different areas of the cable one against another;
• A loop is a curvature of the cable obtained mainly by bending the cable along its length. A loop should not be confused with a twist of the cable which is obtained mainly by twisting the cable on itself. Note that the cable can be both looped and twisted.

Finally, prefabricated structure means all structures made before being assembled together. Such structures are generally made of concrete but may be of various moldable materials.

BRIEF DESCRIPTION OF THE DRAWINGS

• la figure 1 présente une vue longitudinale partielle d'un dispositif de liaison selon l'invention utilisé pour relier deux parois de mur préfabriquées, cette figure 1 montre des barres de clavage disposées dans les parois pour les lier entre elles en bloquant les boucles du câble dans les évidements respectifs des parois ;
• la figure 2 est une vue en coupe transversale d'un angle de bâtiment formé de deux structures préfabriquées entre lesquelles est positionné un dispositif de liaison selon l'invention avant injection du liant ;
• la figure 3 est une vue en coupe transversale de panneaux préfabriquées positionnés pour former un mur plan et entre lesquels est placé le dispositif de liaison selon l'invention avant injection d'un liant ;
• la figure 4 est une vue en coupe transversale d'un plancher préfabriqué et d'un mur préfabriqué disposés pour être liés entre eux à l'aide d'un liant, le dispositif de liaison selon l'invention étant placé entre ces structures préfabriquées ;
• la figure 5 illustre la mise en place du dispositif selon l'invention dans des évidements de bordures adjacentes de panneaux préfabriqués, dans ce mode le dispositif comporte quatre liens parallèles entre eux lorsqu'ils sont tendus ensemble par un outil rectiligne ;
• la figure 6 illustre le dispositif de liaison de la figure 5 une fois mis en place dans les évidements des bordures adjacentes des panneaux préfabriqués ;
• la figure 7 est une vue en perspective d'un dispositif de liaison selon un premier mode de réalisation où il comporte un lien souple formé par un feuillard, ce lien souple servant de moyen de limitation pour maintenir en forme des boucles élastiques du câble ;
• la figure 8 est une vue en perspective d'un dispositif de liaison selon un deuxième mode de réalisation où il comporte une barre rigide servant de moyen de limitation pour maintenir en forme des boucles du câble ;
• la figure 9 est une vue longitudinale du dispositif de liaison de l'invention selon un troisième mode de réalisation où l'on a deux liens souples reliant des spires du câble entre elles, ces liens souples étant parallèles entre eux et étant des fils ou filins ;
• la figure 10 est un exemple de barre rigide destinée à maintenir des zones du câble rapprochées les unes des autres de manière à créer des boucles sur le câble ;
• la figure 11 illustre un mécanisme de fabrication du dispositif de liaison selon l'invention, en particulier le dispositif de liaison qui est fabriqué sur cette figure 11 correspond à celui illustré à la figure 9 ;
• la figure 12 est une partie de kit de liaison selon l'invention comportant un support sur lequel est positionné un dispositif de liaison selon l'invention avec son câble replié et une boite prédécoupée pour recevoir le support et le dispositif de liaison replié ;
• la figure 13 est une vue en coupe transversale du support et du dispositif de liaison de la figure 12 ;
• la figure 14 illustre le positionnement d'un kit de liaison de l'invention en vis-à-vis des évidements adjacents de deux bordures de panneaux préfabriqués, ceci afin d'y mettre en place le dispositif de liaison avant introduction d'un liant ;
• la figure 15 présente une boite appartenant au kit selon l'invention illustré aux figures 12 et 14, dans cette boite est disposé le dispositif de l'invention avant son déploiement ;
• la figure 16a présente un dispositif de liaison en configuration repliée dont les parties mobiles appartiennent à plusieurs pièces ;
• la figure 16b présente le dispositif de la figure 16a alors qu'il est en configuration déployée ;
• les figures 17a à 17g présentent plusieurs modes de réalisations alternatifs de parties mobiles pour dispositifs de liaison selon l'invention ;
• les figures 18a et 18b présentent un dispositif de liaison selon l'invention dont les parties mobiles sont chacune constituées d'une câble en forme de 8 assemblé en son centre à un lien souple ;
• les figures 19a et 19b présentent un dispositif de liaison selon l'invention dont chacune des parties mobiles est formée d'un anneau souple s'étendant dans un plan perpendiculaire à un axe de déploiement du dispositif lui-même parallèle aux liens souples le long desquels sont assemblés ces dits anneaux souples.

Other characteristics and advantages of the invention will emerge clearly from the description which is given below, by way of indication and in no way limiting, with reference to the appended drawings, among which:

• the figure 1 has a partial longitudinal view of a connecting device according to the invention used to connect two prefabricated wall walls, this figure 1 shows keying bars arranged in the walls to bind them together by blocking the loops of the cable in the respective recesses of the walls;
• the figure 2 is a cross-sectional view of a building angle formed by two prefabricated structures between which is positioned a connecting device according to the invention before injection of the binder;
• the figure 3 is a cross-sectional view of prefabricated panels positioned to form a flat wall and between which is placed the connecting device according to the invention before injection of a binder;
• the figure 4 is a cross-sectional view of a prefabricated floor and a prefabricated wall arranged to be interconnected by means of a binder, the connecting device according to the invention being placed between these prefabricated structures;
• the figure 5 illustrates the establishment of the device according to the invention in recesses of adjacent edges of prefabricated panels, in this mode the device comprises four links parallel to each other when they are tensioned together by a rectilinear tool;
• the figure 6 illustrates the link device of the figure 5 once installed in the recesses of the adjacent edges of the prefabricated panels;
• the figure 7 is a perspective view of a connecting device according to a first embodiment where it comprises a flexible link formed by a strip, this flexible link being used as a limiting means for maintaining shaped resilient loops of the cable;
• the figure 8 is a perspective view of a connecting device according to a second embodiment where it comprises a rigid bar serving as a limiting means for keeping cable loops in shape;
• the figure 9 is a longitudinal view of the connecting device of the invention according to a third embodiment where there are two flexible links connecting turns of the cable between them, these flexible links being parallel to each other and being son or threads;
• the figure 10 is an example of a rigid bar for keeping areas of the cable close to each other so as to create loops on the cable;
• the figure 11 illustrates a manufacturing mechanism of the connecting device according to the invention, in particular the connecting device which is manufactured on this figure 11 corresponds to the one shown in figure 9 ;
• the figure 12 is a part of a connection kit according to the invention comprising a support on which is positioned a connecting device according to the invention with its folded cable and a pre-cut box to receive the support and the folded connecting device;
• the figure 13 is a cross-sectional view of the support and the connecting device of the figure 12 ;
• the figure 14 illustrates the positioning of a connecting kit of the invention vis-à-vis the adjacent recesses of two precast panel edges, in order to set up the connecting device before introduction of a binder;
• the figure 15 presents a box belonging to the kit according to the invention illustrated in Figures 12 and 14 in this box is disposed the device of the invention before deployment;
• the figure 16a has a connecting device in folded configuration whose moving parts belong to several parts;
• the figure 16b presents the device of the figure 16a while in deployed configuration;
• the Figures 17a to 17g present several alternative embodiments of moving parts for connecting devices according to the invention;
• the Figures 18a and 18b have a connecting device according to the invention, the movable parts each consist of a cable-shaped 8 assembled at its center to a flexible link;
• the Figures 19a and 19b have a connecting device according to the invention, each of the moving parts is formed of a flexible ring extending in a plane perpendicular to a deployment axis of the device itself parallel to the flexible links along which are assembled said rings flexible.

DETAILED DESCRIPTION OF THE INVENTION

The connecting device 1 according to the invention is intended to allow the connection between two prefabricated structures 3, 4 having edges 5, 6 adjacent to each other and respectively recessed. This device is intended to be inserted into these recesses in an insertion direction which is parallel to these adjacent edges 5, 6 pre-positioned relative to each other.

Each recess of a border 5, 6 is rectilinear and extends along this border which is also rectilinear. These recesses resemble mortises, along which it is possible to slide a looped flexible cable 7 of the device 1. The prefabricated structures 3, 4 are arranged in such a way that the rectilinear and adjacent recesses of the structures to be connected face each other. one of the other and are parallel to each other and oriented towards each other. When the cable 7 is arranged so that a straight line passing through its ends 7a, 7b extends between these recessed adjacent edges 5, 6 and along these edges, the loops 10 of the cable then enter the adjacent recesses. Each of the loops 10 forms a portion of movable portion 40 of the device.

As we see on the Figures 1 to 6 and 14 once placed between these prefabricated structures, that is to say once inserted in their rectilinear edges 5, 6 hollowed out, the connecting device 1 forms a reinforcement which after injection of binder in these same recesses effectively links the prefabricated structures 3, 4 and thus forms an integral assembly 19.

Each of the prefabricated structures 3 and 4 comprises two walls facing each other and interconnected by reinforcing rods or links 20. These rods 20 connecting the walls in pairs can be part of the structure. a strapping 26 linking together four parallel rods 27 as is the case on the sets 19 of the Figures 1 to 4 . Two of the four rods 27 connected with the rods 20 are taken in one of the walls of molded material (such as concrete) and the other two rods 27 are taken in the other of these walls.

In another embodiment visible in the figure 14 each wall of moldable material (concrete) contains a mesh 28 extending inside the wall to serve as a frame and the rods 20 extend between these parallel walls so as to keep them apart one of the other.

Thus, in all the embodiments of prefabricated structures, each structure has a rectilinear recessed edge through which rods 20 extend which make it possible to bind the walls of the structure 3, 4 together. These rods 20 of the border form at least one alignment of rods 20 equidistant from each other. These rods 20 form the bars of a kind of scale.

The connecting device 1 is designed to allow expansion into these adjacent recesses of the structures and this despite the presence of the rods 20.

For this, the device 1 according to the invention comprises a flexural flexible and flexible cable 7 having a plurality of loops 10 disposed between its first and second ends 7a, 7b. As the cable has elasticity in bending, the loops formed are therefore elastically deformable.

As we see on the Figures 1, 2, 3, 4 a first keying bar 31 is arranged between the walls of the first prefabricated structure 3. This first keying bar 31 extends behind the rods 20 which connect the walls of the first structure 3 and it passes through the loops 10 of the cable which extend into the recess of this structure 3 and pass behind the rods 20. A second keybar 31 is disposed between the walls of the second prefabricated structure 4. This second bar 31 extends behind the rods 20 which connect these walls of the second structure 4 and it passes through the loops 10 of the cable 7 which extend in the recess of the structure 4 and pass behind the rods 20.

This arrangement of the two keying bars 31 makes it possible to prohibit the exit of the loops 10 from the respective recesses of the structures 3, 4, since if it is desired to remove the loops 10, they then push the bars 31 to abut against the rods 20 of the structures 3, 4. This connection has an antiseismic protection function since if the concrete breaks under the effect of an earthquake, the bars 31 of keying, preferably steel, and the cable 7 maintain a deformable link between the structures 3, 4 preventing a complete separation of these structures 3, 4.

The limiting means are connected to the different zones 8a, 8b, 8c of the cable so that when these areas of the cable are separated as much as possible from each other, the majority of the loops thus formed have the same shape and are arranged at regular intervals. along the cable. Ideally, as seen on figures 1 and 6 these loops 10 are spaced by the limiting means 9 so that between two rods 20 of the same row of rods 20 aligned in the recess of a given edge 5, 6, there is at least one loop 10.

Thus, a plurality of loops distributed in a regular pattern along the cable are formed with regular loop shapes and adjacent loops spacings which are also regular. The equidistance between the adjacent loops makes it possible to have a regular penetration of the portions of loops in the recesses of the rectilinear edges 5, 6 of the prefabricated structures 3, 4. The cable 7 thus elongated between its ends 7a, 7b according to a straight line passing through these ends 7a, 7b and placed between the structures 3, 4 has a part of the loops 10 which is introduced into the recess of the structure 3 while another part of these loops 10 is introduced into the other recess adjacent to the structure 4. The cable 7, preferably made of steel, makes it possible to form a binding reinforcement having a regular pattern. The binder, once solidified in the recesses, traps at least some of the loops 10 formed between the structures 3, 4 thus creating a rigid connection composite between these prefabricated structures 3, 4.

• une barre rigide 13, comme sur les figures 1, 8 et 10 et /ou
• un ou plusieurs liens souples 11 tels que sur les figures 2 à 7, 9 et 11 à 14.

The limiting means 9 used to limit the maximum spacing between zones 8a, 8b, 8c of the cable may comprise:

• a rigid bar 13, as on the figures 1 , 8 and 10 and or
• one or more soft links 11 such as on Figures 2 to 7 , 9 and 11 to 14 .

In the mode of figure 1 , the limiting means 9 comprises a rigid bar 13 of shorter length than the cable, in this case its length measured between the ends of the flexible cable with which the bar is assembled is at least 20% lower, preferably at least 50% of the maximum length of the cable 7 measured between its ends 7a, 7b. The greater the difference in these lengths, the larger the loops 10. As we see on the Figures 8, 9 and 10 , assembly means 13a, 13b, 13c, 13d are arranged along the bar 13, at regular intervals, to fix the zones 8a, 8b, 8c of the cable. The use of a rigid spacing limiting means such as the bar 13 makes it possible to maintain, at all times, a regular and constant separation pitch between the assembly points 12 of the assembly means 13a, 13b, 13c , 13d.

Ideally the cable is wound several times around the rigid bar 13 which is thus used as a cable support to limit the maximum distance between the cable areas and as a longitudinal reinforcement to stiffen the assembly between the prefabricated structures 3, 4. 13 is provided so that, during the positioning of the device 1 between the structures 3, 4, the assembly means 13a, 13b, 13c are arranged in a plane located between the rods 20 and equidistant from these rods 20 in order to have a symmetrical deformation of the loops 10 placed in the recesses. This makes it possible to have a uniform depression of the loops in the opposite recesses. It is the same with the flexible links that are connected to the cable so that their links with the cable are from and other and equidistant from a plane parallel to the rods 20 and equidistant from these rods 20.

As we see on the figure 8 , an assembly means can be a simple perforation 13a through the bar 13 to pass the cable 7 while spiraling around a portion of the bar 13. In this mode the bar can be in two parts separated in the direction of the length of the bar and between which are formed the perforations.

Another means of assembly may be a hook 13b fixed on the bar 13 forming a clamp for clamping a cable area 8b against the bar 13. Such a hook can be made by cutting and stamping a shape in the bar or can to be fixed on the bar for example by welding. It is thus possible to realize these assembly means by fixing a row of hooks along the bar 13.

Another means of assembly can be achieved using a variety of U-shaped clips 13c fixed to the bar 13.

As illustrated in figure 10 , another means of assembly can a series of open cuts 13d on the edges of the bar 13. In this case the size of each cutout allows the passage of the cable 7 in the cutout so that it is maintained. Ideally, the bar 13 has a cross-section that is suitable for having a plurality of parallel edges that are easy to cut and that allows longitudinal rigidity of the bar 13. Thus, the bar 13 can have an H-shaped cross-section as on FIG. figure 10 , U, Z or any other section having at least two edges capable of being cut to form the notches 13d cable passage.

In all cases these assembly means attached to the bar 13 may be arranged in pairs, each pair of assembly means being located between two corresponding loops (as is the case for the means 13c on the figure 8 ). This avoids the rotation of the areas of the cable assembled with the bar 13 relative to this bar. Even after deformation of the cable when it is introduced into the recesses, a relatively homogeneous loop geometry is thus maintained throughout the bar.

In other modes, such as Figures 2 to 7 , 9 and 11 to 13 , the limiting means 9 comprise one or more flexible links 11. In this case, a flexible link 11 can be formed using a wire as on the Figures 2 to 6 , 9 , 11 to 13 , or using a band such as a metal strip as on the figure 7 .

Each flexible link 11 has a maximum length, measured between the ends of the flexible link, which is less than 20%, preferably at least 50%, of the maximum length of the cable 7 measured between its 7a, 7b.

The connecting device 1 comprises several assembly means 12 of the flexible link 11 with the cable 7, these assembly means 12 being fixed along the link 11 and each to a corresponding zone of the cable 7.

An assembly means 12 may be a knot made with the flexible tie around the cable (as on the Figures 5, 6 , 9 ) or crimping or stapling or welding (especially if the flexible link is metallic), as Figures 2, 3, 4 , 11, 12, 13 .

• pour le mode de réalisation des figures 11 à 13 où l'on a deux liens répartis de part et d'autre du dispositif 1 et chacun relié à intervalles réguliers au câble pour le forcer à faire une boucle entre une liaison avec un premier lien souple et une liaison avec le second lien souple.

Ideally, the device 1 comprises a plurality of flexible links 11 distributed symmetrically about a general direction of the device 1. This is particularly the case: - for the embodiment of the Figures 5 and 6 or there are four flexible links each extending along the general direction of the device 1 and each connected to the cable at regular intervals; or

• for the embodiment of Figures 11 to 13 where there are two links distributed on either side of the device 1 and each connected at regular intervals to the cable to force it to make a loop between a link with a first flexible link and a link with the second flexible link.

The advantage of having a plurality of flexible links thus distributed is that when the zones 8a, 8b, 8c of the cable 7 which are connected to the connecting means 9 are spaced as far as possible from each other, the device then comprises a rectilinear hollowed area. Z extending between the first and second ends 7a, 7b of the cable. As we see on the figures 5 , 12, 13 and 14 this recessed area Z is arranged to allow the passage of a rectilinear tool 17 forcing the spacing of the second end 7b of the cable 7 relative to the first end 7a of the cable 7. It is noted that on the Figures 2, 3 and 3 is illustrated device 1 of figures 9 and 11 whose flexible links are two in number and are located on either side of a plane passing through all the loops 10 of the cable 7. These flexible links 11 when extended, to limit the spacing of the cable areas relative to one another, they form two straight lines parallel to each other passing through a plane equidistant from the ends of the loops 10 of the cable, thus favoring a symmetry of insertion of the device 1.

Other alternative embodiments of connection devices also adapted to the implementation of the method of manufacturing an assembly 19 according to the invention will now be described.

In any case, as we see on the Figures 1-9 , 11 and 16a to 19b , the connecting device 1 according to the invention comprises at least several movable parts 40 relative to each other. Some of these moving parts 10, 40 are arranged to penetrate at least partially inside the rectilinear rim 5 of one of the prefabricated structures 3 and some other of these movable parts 10, 40 penetrate at least partially inside the the rectilinear recessed edge 6 of the other prefabricated structures 4.

This mobility of the moving parts between them is such that the overall width of the device can be reduced when necessary by moving moving parts intended to come into a recess of a structure of other moving parts intended to come into the other recess. the other structure to assemble. These moving parts 40 are respectively assembled at different assembly points 12 extending along spacing limiting means 9 of these assembly points 12. This limits the maximum spacing between assembly points 12. It is thus possible to slide the device along a sliding axis parallel to the length of the device and to the rectilinear edges of the structures while maintaining a spacing between the assembly points and allowing, when necessary, a variation in the width of the device. so that it can continue to slide even if it stops laterally against an obstacle present in a recess of a structure. In the end, thanks to the invention, the moving parts 40 are simply and uniformly distributed along the borders.

In several particular modes, such as those illustrated in Figures 2 to 7 , 9 , 11-19b , the spacer limiting means 9 comprise at least one flexible link 11 and each of the movable parts 40 is assembled to this flexible link 11 by at least one of the connecting means 12 which corresponds to it. This makes it possible to have a device which when placed in deployed configuration has a constant distance between the means Ideally, this constant distance forms a regular spacing pitch of the moving parts 10, 40.

• une configuration repliée dans laquelle le lien souple 11 est replié, comme c'est le cas sur les figures 16a, 18a et 19a ; et
• une configuration déployée dans laquelle le lien souple est déployé, comme c'est le cas sur les figures 16b, 18b et 19b.

Thus, the device is arranged to adopt selectively:

• a folded configuration in which the flexible link 11 is folded, as is the case on the Figures 16a, 18a and 19a ; and
• a deployed configuration in which the flexible link is deployed, as is the case on Figures 16b, 18b and 19b .

The assembly points 12 are arranged so that the moving parts 10, 40 are further apart from each other when the device 1 is in deployed configuration than when it is in folded configuration.

• soit présente deux extrémités placées de part et d'autre du point d'assemblage 12 avec le lien souple, comme c'est le cas sur les figures 16a, 16b, 17b, 17c, 17e, 17f, 17g ;
• soit présente une boucle fermée en forme de 8 comme sur les figures 18a, 18b ou une boucle fermée en forme d'anneau comme sur les figures 17f, 19a, 19b.

In particular modes, the movable parts 40 are each constituted by a flexible strand, such as a strand of steel cable, which:

• is present two ends placed on either side of the assembly point 12 with the flexible link, as is the case on the FIGS. 16a, 16b, 17b, 17c, 17e, 17f, 17g ;
• is present a closed loop in the shape of 8 as on the Figures 18a, 18b or a closed ring-shaped loop like on Figures 17f, 19a, 19b .

In the modes of Figures 16a and 16b of which a moving part 40 is illustrated at the figure 17c , the flexible strand has the same section over its entire length.

However, and advantageously, each of the ends of the strand 40 may comprise crimped ends to increase the section of the movable portion at its ends and thus promote its attachment with the binder.

Alternatively, the ends of the strand 40 each can be curved towards a central zone of the strand 40 and crimped to each form a loop 10. Each of these loops 10 forms one of the ends of the movable portion 40 promotes the attachment of the binder and possibly allows the passage of a keybar.

In the embodiment of the figure 17d , the movable portion 40 consists of two flexible rings. Each of these rings is connected at points 12 away from the link 11. It may be noted that when the flexible link is linked at two points of a mobile part 40 in the form of a closed ring, this link 11 can be interrupted between these two points which allows to deform the rings by pulling the link 11 on both sides of the flexible ring. This aspect promotes the reduction of the width of the device during its positioning in the grooves. The ring is formed of a flexible and elastic material which tends to oppose the crushing of the ring in a flattening direction perpendicular to the length of the device. The device is thus elastically deformable along its width to have a better depression in the recesses 5, 6. Each of these rings of the figure 17d is formed of a flexible cable carrying a piece symbolized by a rectangle shape. Each of these symbolized rectangle-shaped pieces forms a protuberance around the ring that carries it to promote its grip with the binder.

• une position dans laquelle elles s'étendent perpendiculairement à l'axe x de déploiement du dispositif 1 ; et
• une position dans laquelle elles s'étendent parallèlement à cet axe x.

Alternatively, in the mode of figure 17a it can be seen that a mobile part 40 may be constituted by at least two rigid parts 40a, 40b hinged together to be movable between:

• a position in which they extend perpendicularly to the x axis of deployment of the device 1; and
• a position in which they extend parallel to this axis x.

By these characteristics, there is still a capacity of the device to have a variable width.

Note that the deployment axis of the device extends along the length of the device.

These parts 40a, 40b are rigid and articulated about an axis of articulation x1 perpendicular to a plane itself perpendicular to the x axis of deployment of the device 1. Thus, when the rigid articulated parts 40a, 40b are parallel to the x axis of deployment of the device 1, the latter has a width less than its width when the rigid parts extend perpendicularly to the x axis. In this embodiment, it can also be done so that each of the movable parts 40 comprises elastic means for returning the parts 40a, 40b to the positions in which they extend perpendicularly to the x axis. In this way, the moving parts tend to deploy laterally along the device 1 to penetrate the borders 5, 6 of the prefabricated structures. It is noted that the ends of the parts 40a, 40b which are the furthest away from the hinge x1 may comprise excrescences or rings to promote adhesion with the binder and possibly allow the passage of a keying bar 31.

The invention also relates to a device according to any one of claims 3 to 5 for which the spacer limiting means 9 comprise at least one flexible link 11.

The invention also relates to a connection kit 14 for making a connection between two prefabricated structures 3, 4 as described above and further comprising at least one connecting device 1 according to any one of the modes described above.

• les différentes zones du câble 8a, 8b, 8c qui sont reliées aux moyens de limitation 9 sont rapprochées les unes des autres d'une distance inférieure à une distance maximum d'écartement relatif de ces zones ; et
• le câble 7 est enroulé sur lui même de manière à délimiter une zone centrale Zc de libre passage.

As can be seen in particular on Figures 12 and 13 , the kit also comprises a support 15 arranged to receive the connecting device 1 while it is in a folded configuration. When the connecting device is in folded configuration:

• the different areas of the cable 8a, 8b, 8c which are connected to the limiting means 9 are spaced from each other by a distance less than a maximum distance of relative spacing of these zones; and
• the cable 7 is wound on itself to delimit a central zone Zc free passage.

Ideally, in folded configuration, the spacing distance of the ends 7a, 7b of the cable 7 is less than 80% of the maximum spacing distance of these ends 7a, 7b when the device is unfolded (that is to say when the areas of the cable connected to the limitation means are the most distant from each other). In other words, the length of the binding device when folded is less than at least 80% of its length when unfolded (i.e. when the cable areas are furthest apart from each other ), which facilitates the storage of the device 1.

As can be seen in particular on Figures 12 and 13 , the support 15 has an opening 16 for the passage of a rectilinear tool 17 belonging to said connection kit 14. This rectilinear tool 17, visible on the figure 14 , is arranged to hook to a portion of the device 1 closer to the second end of the cable 7b than the first end of the cable 7a. The tool 17 slides in the free passage zone Zc of the support and makes it possible to move the first and second ends of the cable 7a, 7b away from each other.

• une fonction, de centrage du câble avant le déploiement du câble hors du support ; et
• une fonction de guidage de l'outil au travers de l'ouverture 16.

The support is U-shaped or box-shaped with an opening allowing both the passage of the rectilinear tool 17 and the passage of the connecting device when it is extended to place it in the recesses of the structures 3, 4. As can be seen in the Figures 12 and 13 , the U-shaped support has lateral elastic hooks to prevent the cable from deploying under its own elasticity and to allow unfolding due to the pulling force generated with the tool. This support also has an opening 16 formed at its base. This opening extends parallel to the axis of symmetry of the U forming a tube 18. The folded cable 7 is wound around the tube 18 which thus avoids entanglement loops 10 of the cable. This tube 18 to:

• a function of centering the cable before the deployment of the cable out of the support; and
• a guide function of the tool through the opening 16.

As illustrated in figure 12 the kit according to the invention may also comprise a box 21 for storing the support on which the cable is wound. This box 21, detailed at figure 15 , Can be cardboard and have a clean opening 22 pre-cut on one of its faces, to let the device during deployment in the recesses of the borders. The pre-cutting is in the form of a rectangle whose sides are respectively parallel to the edges of the face carrying the opening 22, with in addition a central pre-cutting to facilitate the passage of the tool 17 through this face. On a face opposite to that carrying the pre-cut opening 22, there is a sliding opening 32 of the rectilinear tool 17 in the box 21 to stretch the cable 7 (shown in phantom and also visible through openings 32, 33a, 33b) and out of the box 21. On the same face 36, the box 21 may comprise two openings 33a, 33b respectively placed on either side and away from the opening 32. These openings 33a, 33b are used to view the cable deployed in the recesses of the structures. It is thus possible to guide the tool 17 which is visible to the operator via these openings 33a, 33b. These openings 33a and 33b are respectively formed by partially cutting portions of the wall 36 to form tabs 35a, 35b extending into the box 31 inside the loops 10 of the folded cable 7. These tabs 35a, 35b have each side connected to the wall 36 to pivot via this connection to the inside of the box 21 and thus separate the loops 10 from each other during the deployment of the device 1. The advantage of such a box 21 is that the device is easily stored and remains protected until the moment of its use (the tabs 35a and 35b can remain closed until the moment when it is desired to deploy the device 1).

The invention finally relates to a manufacturing mechanism 23 of the connecting device 1. This mechanism 23 comprises a main part 24 (here it is a prismatic part 24) on which are mounted to rotate the coils B1 and B1 ' on which are wound flexible links 11. This main part 24 is rotatably mounted along an axis XX relative to another coil B2 carrying the cable 7. The main part carries winding means 25 of the cable 7 from its coil B2. Thus, by pivoting the main part 24 along its axis XX with respect to the cable-carrying coil B2, the cable 7 is wound around the winding means 25. The manufacturing mechanism 23 further comprises an assembly tool 29 with links the cable 7 as it winds around the winding means 25. The assembly tool 29 may for example be a welding head movable between a position in which it is in contact with a link unwound and the cable 7 and a remote position allowing the free rotation of the main part 24 relative to the welding head 29.

Finally, the manufacturing mechanism 23 may also comprise a mobile press 30 for selectively compressing a portion of cable against one of the winding means 25, thus making it possible to plastically curve the cable and preform the curvature of the loops 10. Ideally the most pronounced curvature of the cable are at the loops 10 and are all placed in the same plane, thus facilitating the insertion of the device 1 between the prefabricated structures.

This manufacturing mechanism 23 also comprises two guides formed through the piece 24 (wire guides) to position the links opposite the cable 7 and in the axis of the welding head 29 to thus allow the connections of the cable 7 wound with the flexible links 11.

To generate the connecting device 1 by means of the manufacturing mechanism 23, the main part 24 is pivoted by half a turn, which leads to the winding of a length of cable 7 around the winding means 25 Then the cable is pressed to preform a loop 10 and the welding head 29 is lowered to make a connection between the cable 7 and a link 11. Then the welding head 29 is raised, the mobile press 30 is pulled apart and one pivots again the main part 24 of a half turn leading to the winding of a new length of cable 7. The press is then advanced to press the cable and form a new loop 10. Finally, the head is lowered again. welding 29 to make a new assembly of a link 11 with a new zone of the cable 7. These operations are repeated several times until a length of the device 1 which is sufficient to extend over the entire length of the edges to be joined.

The invention is not limited to the above, in particular the welding head 29 may be replaced by any means for making an assembly between the link and a cable area. For example, the welding head can be replaced by gluing or crimping or ligation means.

• un pré mur composé de deux peaux liées entre elles par des tiges d'armatures, l'espace entre ces peaux étant destiné à recevoir un liant ; ou
• un mur sandwich présentant une bordure fermée vers l'intérieur du mur et ouverte vers l'extérieur de manière à ce que le liant ne puisse s'étendre qu'au niveau de la bordure. On note que, conformément aux modes des figures 18a, 18b, 17d, 17e, 17f19a, 19b, le dispositif de liaison peut aussi comporter une pluralité de câbles ayant chacun au moins deux boucles 10 placées de part et d'autres d'une direction générale du dispositif. On note que cette direction générale du dispositif est la direction selon laquelle s'étend la longueur du dispositif. Dans les modes où le dispositif est agencé pour être déployé, c'est-à-dire les modes où le lien est souple, cette direction générale du dispositif correspond à la direction de déploiement x du dispositif, c'est-à-dire la direction selon laquelle le dispositif présente sa dimension la plus grande qu'est sa longueur. On note que la largeur du dispositif est inférieure à la longueur du dispositif.

The connecting device 1 has been presented to bond together prefabricated structures with rods 20 extending through the recesses of the borders, but it is also possible to use this connecting device 1 to connect together structures with borders recesses having no rods 20 through the recesses. In particular, a prefabricated structure can be:

• a pre-wall composed of two skins interconnected by reinforcing rods, the space between these skins being intended to receive a binder; or
• a sandwich wall having a closed edge towards the inside of the wall and open towards the outside so that the binder can only extend at the level of the edge. It is noted that, in accordance with the modes of Figures 18a, 18b, 17d, 17e, 17f19a, 19b , the connecting device may also include a plurality of cables each having at least two loops 10 placed on either side of a general direction of the device. Note that this general direction of the device is the direction in which the length of the device extends. In the modes where the device is arranged to be deployed, that is to say the modes where the link is flexible, this general direction of the device corresponds to the deployment direction x of the device, that is to say the direction in which the device has its largest dimension length. Note that the width of the device is less than the length of the device.

Finally, it is noted that the ends 7a, 7b of the cable 7 designate the portions of the cable which, in the general direction of the device 1, are furthest apart from each other. The cable may have a strand shape cut at its ends 7a, 7b or be formed of a closed loop on itself. In the latter case the ends 7a, 7b of the cable are the portions of the closed loop-shaped cable which are furthest apart from each other when the cable areas 8a, 8b, 8c are furthest apart from each other. others (ie when the device is stretched to the maximum with its flexible links stretched).

Note that it is also possible, after having introduced the connecting device 1 of the invention so that a portion of its loops 10 pass between rods 20 of one of the prefabricated structures and another part of its loops pass between the rods 20 of the other of these prefabricated structures, to introduce a first keybar through the loops present in one of the prefabricated structures and a second keybar through the loops present in the other prefabricated structures. Each of these keying bars preferably extends parallel to the recessed edges and is positioned so that in case of traction on the loops of the cable, to remove them from the recess where they are located, the keybar comes to bear against the rods 20 to prevent the withdrawal of loops out of the prefabricated structure where they are. Each keybar has the further advantage of forming a reinforcement between the walls of the structure that receives them and solidifies the connection between the structures. This mode of keying is applicable to all modes where mobile parts 40 of the connecting device comprise loops 10 allowing the passage of keying bars, as is the case for the devices of the FIGS. 17d, 17e, 17f, 18a, 18b, 19a, 19b .

Finally, the tool 17 for deploying the device 1 may have any shape for gripping a portion of the cable to elongate. Thus, the tool 17 may have a fork end to receive a loop 10 of the cable or hook assembled to the cable 7 or a loop connected to the various flexible links (the flexible links may be steel ropes).

From the point of view of dimensioning, the flexible links are connected to the cable so that the zones of the cable which are adjacent to each other are spaced apart from each other by a constant pitch (when measured according to the general direction of the device), this corresponding step in step between the rods 20 of the structures. Typically the pitch between two adjacent loops is 15 cm, and the pitch between adjacent rods 20 of the same structure 3, 4 is also 15cm. In such a case each loop 10 of the cable measured between two linkage areas with the links is formed of a cable length of 85 cm.

The invention also relates to an assembly 19 comprising two prefabricated structures 3, 4 for the construction of a building, each comprising at least one rectilinear recessed edge 5, 6, these recessed edges of the respective prefabricated structures being adjacent to each other. other and the recesses being in vis-à-vis. The assembly 19 comprises a connecting device 1 according to any one of the aforementioned embodiments. At least some of the loops 10 formed by the cable 7 penetrate at least partially inside the rectilinear recessed edge of one of the prefabricated structures 3 and some other loops 10 formed by the cable 7 penetrate at least partially inside the rectilinear recessed edge of the other of the prefabricated structures 4. The assembly 19 further comprises a solidified binder, such as cement, arranged between these prefabricated structures 3, 4, and within each of the recesses rectilinear borders 5, 6, this binder surrounding at least some of the loops 10 of said cable 7.

Note that in some embodiments of the device according to the invention, all the movable parts 40 belong to one and the same deformable piece such as a cable forming loops. This is the case, for example, for Figures 1 to 15 .

In other alternative modes of the device according to the invention, the mobile parts 40 may belong to several distinct parts and movable relative to each other at least according to the width of the device. This is the case, for example, for Figures 16a to 19b .

Finally, although the moving parts 40 of Figures 16a to 19b are assembled to a flexible link 11 serving as spacing limitation means 9, these movable parts 40 could also be assembled to a rigid spacing limiting means 9, such as the bar 13 figures 1 , 8, 10 .

Claims (15)

1. A method of fabricating an assembly (19) including two prefabricated structures (3, 4) each including at least one rectilinear recessed edge (5, 6), the method including in succession:

   - positioning the two prefabricated structures (3, 4) so that the recessed edges (5, 6) of the respective prefabricated structures are adjacent,

   - positioning a connecting device (1) including a plurality of parts (40) mobile relative to one another, these mobile parts (40) being respectively assembled at different assembly points (12) extending along means (9) for limiting the distance between these assembly points (12), some of these mobile parts (10, 40) entering at least partially the rectilinear recessed edge (5) of one prefabricated structure (3) and others of these mobile parts (10) entering at least partly the rectilinear recessed edge (6) of the other prefabricated structure (4),

   - introducing into the recesses of the adjacent recessed edges and around the mobile parts (10, 40) entering these recessed edges (5, 6) a fluid binder adapted to solidify, such as cement, to produce between the prefabricated structures (3, 4) and inside their adjacent recesses (5, 6) a reinforcement enveloped by the binder.
2. A method according to claim 1, wherein the distance limiting means (9) are rigid so as to maintain permanently a constant and regular pitch between the assembly points (12).
3. A method according to claim 1, wherein the distance limiting means (9) include at least one flexible link (11), each of the mobile parts (40) being assembled to this flexible link (11) by at least one of the corresponding assembly means (12), the device being adapted to adopt selectively:

   - a folded configuration in which the flexible link is folded, and

   - a deployed configuration in which the flexible link is deployed,

   the assembly points (12) being arranged so that the mobile parts (10, 40) are farther away from one another when the device (1) is in the deployed configuration than when it is in the folded configuration.
4. A method according to any one of claims 1 to 3, wherein at least some of the mobile parts (40) each consist of a flexible strand such as a steel cable.
5. A method according to any one of claims 1 to 4, wherein at least some of the mobile parts (40) each comprise at least two rigid portions (40a, 40b) articulated so as to be mobile between a position in which they are perpendicular to a deployment axis (X) of the device and a position in which they are parallel to this deployment axis (X) of the device.
6. A method according to any one of claims 1 to 5 wherein:

   - one of the two prefabricated structures (3), referred to as the first prefabricated structure (3), includes walls and rods (20) that extend across the rectilinear recessed edge of this first prefabricated structure (3) to join together the walls of this first prefabricated structure (3),

   - the other prefabricated structure, referred to as the second prefabricated structure (4), also includes walls and rods (20) that extend across the rectilinear recessed edge of this second prefabricated structure (4) to join together the walls of this second prefabricated structure (4),

   the method further including the positioning of keying bars (31),

   - a first keying bar (31) being disposed between the walls of the first prefabricated structure (3), this first keying bar (31) lying behind the rods (20) that connect the walls of this first structure (3) and this first keying bar (31) entering the loops (10) of the mobile parts (40) inside the recess of this first prefabricated structure (3) and behind the rods (20) that join the walls of this first structure (3),

   - a second keying bar (31) is disposed between the walls of the second prefabricated structure (4), this second keying bar (31) lying behind the rods (20) that join the walls of this second structure (4) and this second keying bar (31) entering the loops (10) of the mobile parts (40) inside the recess of this second prefabricated structure (4) and behind the rods (20) that join the walls of this second structure (4).
7. A connecting device (1) for connecting two prefabricated structures (3, 4) having rectilinear recessed edges (5, 6) facing each other, characterised in that the device (1) includes:

   - a flexible cable (7) having first and second ends (7a, 7b) between which are cable zones (8a, 8b, 8c) spaced apart along the cable (7),

   - means (9) for limiting the distance between the zones of the cable, these limiting means (9) including at least one flexible link (11), the device being adapted to adopt selectively:

   - a folded configuration in which the flexible link is folded, and

   - a deployed configuration in which the flexible link is deployed,

   said at least one flexible link being connected to said zones (8a, 8b, 8c) of the cable so that when the device is in the deployed configuration these zones are as far apart from one another as possible and the cable (7) forms a plurality of loops (10) between the respective zones of the cable disposed so as to be able to enter at least partly said recessed edges when the cable (7) is disposed between the two prefabricated structures (3, 4) so that a straight line passing through its ends (7a, 7b) lies substantially along these edges (5, 6).
8. A device (1) according to claim 7, wherein the limiting means (9) are connected to the various zones (8a, 8b, 8c) of the cable (7) in such a manner that when these zones are as far apart as possible most of the loops (10) formed in this way are the same shape and are disposed at regular intervals along the cable (7).
9. A connecting device according to either one of claims 7 or 8, wherein said at least one flexible link (11) has a maximum length measured between the ends of the flexible link that is at least 20%, preferably at least 50%, less than the maximum length of the cable (7) measured between its first and second ends (7a, 7b) and wherein the limiting means (9) further include a plurality of means (12) for assembling the flexible link (11) and the cable, these assembly means being fixed along the link (11) and each to a corresponding zone of the cable (7).
10. A connecting device according to claim 9, including a plurality of flexible links (11) distributed symmetrically about a general direction of the device (1).
11. A connecting device according to any one of claims 7 to 10, wherein when the zones (8a, 8b, 8c) of the cable (7) connected to the connecting means (9) are as far apart as possible the device includes a rectilinear recessed area (Z) between the first and second ends (7a, 7b) of the cable, this recessed area (Z) being adapted to allow the passage of a rectilinear tool (17) for forcing the second end (7b) of the cable (7) away from the first end (7a) of the cable (7).
12. A connecting kit (14) for making a connection between two fabricated structures (3, 4) each including at least one rectilinear recessed edge (5, 6), characterised in that it includes at least one connecting device (1) according to any one of claims 7 to 11 and a support (15) adapted to receive the connecting device (1) when it is in its folded configuration in which:

    - the distance between the various zones (8a, 8b, 8c) of the cable that are connected to the limiting means (9) is less than a maximum relative distance between these zones, and

    - the cable is wound on itself in such a manner as to delimit a central free passage zone (Zc).
13. A connecting kit (14) according to claim 12, wherein the support (15) adapted to receive the connecting device (1) when it is in its folded configuration includes an opening (16) for the passage of a rectilinear tool (17) of said connecting kit (14), this rectilinear tool (17) being adapted to hook onto a portion of the device (1) nearer the second end (7b) of the cable than the first end (7a) of the cable and to slide in the free passage zone (Zc) in such a manner as to move these first and second ends (7a, 7b) of the cable away from each other.
14. An assembly (19) including two prefabricated structures (3, 4) each including at least one rectilinear recessed edge (5, 6), these recessed edges of the respective prefabricated structures being adjacent one another, the assembly (19) being characterised in that it further includes a connecting device (1) according to any one of claims 7 to 11, at least some of the loops (10) formed by the cable (7) entering at least partly the rectilinear recessed edge of one of the prefabricated structures (3), referred to as the first prefabricated structure (3), and others of the loops (10) formed by the cable (7) entering at least partly the rectilinear recessed edge of the other prefabricated structure (4), referred to as the second prefabricated structure (4), the assembly (19) further including a binder such as cement disposed between these prefabricated structures (3, 4) and inside each of the recesses of the rectilinear edges (5, 6), this binder there enveloping at least some of the loops (10) of said cable (7).
15. An assembly according to claim 14, wherein:

    - the first prefabricated structure (3) includes walls and rods (20) that extend across the rectilinear recessed edge of this first prefabricated structure (3) to join together the walls of this first prefabricated structure (3),

    - the second prefabricated structure (4) also includes walls and rods (20) that extend across the rectilinear recessed edge of this second prefabricated structure (4) to join together the walls of this second prefabricated structure (4),

    - a first keying bar (31) is disposed between the walls of the first prefabricated structure (3), this first keying bar (31) lying behind the rods (20) that connect the walls of this first structure (3) and this first keying bar (31) entering the loops (10) of the cable inside the recess of this first prefabricated structure (3) and behind the rods (20) that join the walls of this first structure (3),

    - a second keying bar (31) is disposed between the walls of the second prefabricated structure (4), this second keying bar (31) lying behind the rods (20) that join the walls of this second structure (4) and this second keying bar (31) entering the loops (10) of the cable inside the recess of this second prefabricated structure (4) and behind the rods (20) that join the walls of this second structure (4).

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