EP3763897A1 - Lifting anchor for wall with built-in formwork and wall with built-in formwork comprising said lifting anchor - Google Patents

Abstract

Lifting anchor for wall with integrated formwork and wall with integrated formwork comprising said lifting anchor The present invention relates to a lifting anchor (1) for wall with integrated formwork (2), said wall with integrated formwork (2) comprising a first wall ( 3), a second wall (4), and a connection element for connecting them and keeping them at a distance from each other, to form between them a filling space (5) of thickness (E), said lifting anchor (1) comprising: -an elongate metal element (6) folded into a U-shape which comprises a folded base (7), a first branch (8) and a second branch (9), - a compression element ( 10) transverse arranged perpendicular to said first and second branches (8, 9), said compression element (10) comprising a first end portion (12) and a second end portion (13) respectively projecting from the first branch (8) and from the second branch (9), said lifting anchor (1) is characterized in that: - said compression element (10) has a cross section of dimension between 1600 square millimeters and 23000 square millimeters, - the first end portion (12) and the second end portion (13) are respectively projecting from the first branch (8) and of the second branch (9) by a distance of between 15 millimeters and 25 millimeters.

Description

The present invention relates to a lifting anchor for an integrated formwork wall and to an integrated formwork wall comprising such a lifting anchor.

In a known manner, a wall with integrated formwork comprises a first wall and a second wall which are substantially parallel to each other. A plurality of connection elements is, moreover, provided for connecting and maintaining the first wall and the second wall at a distance from one another, so as to form a filling space between them. These connection elements are at least partly embedded in the first wall and the second wall and extend through the filling space. Furthermore, structural reinforcements, embedded inside the first wall and / or the second wall, are also provided to reinforce the structure of the first wall and / or of the second wall.

Lifting anchors, of the loop or lifting hook type, are usually integrated into a wall with integrated formwork to allow its handling with a handling device, such as a crane.

Integrated shuttering walls are generally manufactured in the factory and then transported to a construction site for interior walls and / or exterior walls. After installation of the wall with integrated formwork on the site, its filling space forms a formwork which is filled with at least one hydraulic material, for example concrete.

During the manufacture of the wall with integrated formwork, the structural reinforcements as well as the lifting anchors are embedded at least in part in a hydraulic material of the first and second walls of the wall with integrated formwork, for example concrete. After assembly of the first and second walls of the wall with integrated formwork, the latter can be handled using the lifting anchors. Indeed, some metal portions of the lifting anchors are not embedded in the hydraulic material and are visible and accessible from space. filling existing between the first and second walls. Thanks to this arrangement, the lifting anchors can be connected to the handling machine.

Lifting hooks are known in particular from the publication DE 299 14 138 U1 and are composed of a long bent U-shaped rod having two branches substantially parallel to each other and which are anchored respectively in the first and second walls of the wall with integrated formwork over a significant length to ensure the sealing of the lifting hook. A strut, which is arranged transversely to the first and second branches and welded to them, is also provided to take up the clamping forces, in order to prevent the lifting hook from loosening. This strut has a diameter which may be between 25 millimeters and 28 millimeters. This butt protrudes on either side of the first and second branches by a distance of between 8 millimeters and 12 millimeters. The first and second branches protrude from the butt over a length of between 300 millimeters and 400 millimeters. Due to the length of the first and second branches, these lifting hooks have the drawback of being very bulky and of requiring minimum embedding in the walls of the wall with integrated formwork, which imposes positioning constraints during manufacture. lifting hooks relative to the structural reinforcements of the first and second walls. Finally, this type of lifting hook generally has a maximum WLL payload of about 2.4 tonnes.

We know from the publication DE 10 2005 009 708 A1 , a lifting hook proposed to avoid loosening and which has the particularity of comprising a glued-laminated wood strut forming a compression member which comprises notches in which a portion of the section of the metal branches of the lifting hook fits . This strut is only used to prevent the deformation of the metal part during lifting. More particularly, under the effect of the lifting force, the two metal branches tend to move closer to one another. The strut makes it possible to oppose the coming together of the metal branches. However, an internal anchoring of the metal branches in the concrete of at least 1 cm is necessary.

We also know the demand EP3078784 A1 another type of lifting device comprising an axle and a strap. However, under the effect of the lifting force, this axis is deformed. In fact, lifting using a traditional axis is generally done by the middle of the latter. Therefore, significant forces are applied having the consequence of making it flare up. To overcome this phenomenon, axes of large sections are used, the diameter of which is generally greater than 100 millimeters. Most of the time, for this type of lifting axis, a phenomenon of plate dissociation is observed at the level of the anchoring in the wall, because the diameter of the axis is at least 3 times greater than the coating. However, this phenomenon is very detrimental for the panels which have to be watertight.

The object of the present invention is to overcome at least one of the aforementioned drawbacks by providing a space-saving solution, easy to integrate into a wall with integrated formwork, which guarantees a maximum payload CMU respecting the standards in force and which avoids degradation. the properties of the wall with integrated formwork.

• un élément métallique allongé replié préférentiellement sensiblement en forme de U qui comprend une base repliée, une première branche et une deuxième branche préférentiellement sensiblement parallèles entre elles, disposées dans un même plan,
  la base repliée raccordant lesdites première et deuxième branches entre elles et étant configurée pour être saillante dans l'espace de remplissage et étant configurée pour être apte à être connectée à un engin de manutention,
• un élément de compression transverse disposé perpendiculairement auxdites première et deuxième branches étant connecté auxdites première et deuxième branches par des moyens de connexion,
  ledit élément de compression comprenant une première portion extrémale et une deuxième portion extrémale respectivement saillantes de la première branche et de la deuxième branche,
  ladite ancre de levage est caractérisée en ce que :
• ledit élément de compression présente une section de dimension comprise entre 1600 millimètres carré et 23000 millimètres carré,
• la première portion extrémale et la deuxième portion extrémale sont respectivement saillantes de la première branche et de la deuxième branche d'une distance comprise entre 15 millimètres et 25 millimètres.

To this end, the invention relates to a lifting anchor for a wall with integrated formwork, said wall with integrated formwork comprising a first wall made of hydraulic material disposed in a first plane, a second wall of hydraulic material disposed in a second plane, the first plane and the second plane being substantially parallel to each other, and at least one connecting element for connecting and maintaining at a distance from each other the first wall and the second wall, so as to form between them a filling space d 'thickness suitable and intended to be filled with at least one hydraulic material, said lifting anchor comprising:

• an elongated metal element folded preferably substantially in the shape of a U which comprises a folded base, a first branch and a second branch preferably substantially parallel to each other, arranged in the same plane,
  the folded base connecting said first and second branches together and being configured to protrude into the filling space and being configured to be able to be connected to a handling machine,
• a transverse compression element arranged perpendicular to said first and second branches being connected to said first and second branches by connection means,
  said compression element comprising a first end portion and a second end portion respectively projecting from the first branch and from the second branch,
  said lifting anchor is characterized in that:
• said compression element has a section of dimension between 1600 square millimeters and 23000 square millimeters,
• the first end portion and the second end portion are respectively projecting from the first branch and from the second branch by a distance of between 15 millimeters and 25 millimeters.

• [Fig. 1] la figure 1 représente une vue en perspective d'une ancre de levage selon l'invention dans une première variante de réalisation,
• [Fig. 2] la figure 2 représente une vue en perspective d'une ancre de levage selon l'invention dans une deuxième variante de réalisation,
• [Fig. 3] la figure 3 représente une vue de face de l'ancre de levage selon l'invention de la figure 1,
• [Fig. 4] la figure 4 représente une vue de dessous de l'ancre de levage selon l'invention de la figure 1, et
• [Fig. 5] la figure 5 représente une vue de côté d'un mur à coffrage intégré selon l'invention intégrant une ancre de levage selon l'invention.

The invention will be better understood, thanks to the description below, which relates to several preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended schematic drawings, in which:

• [ Fig. 1 ] the figure 1 shows a perspective view of a lifting anchor according to the invention in a first variant embodiment,
• [ Fig. 2 ] the figure 2 shows a perspective view of a lifting anchor according to the invention in a second variant embodiment,
• [ Fig. 3 ] the figure 3 shows a front view of the lifting anchor according to the invention of the figure 1 ,
• [ Fig. 4 ] the figure 4 shows a bottom view of the lifting anchor according to the invention of the figure 1 , and
• [ Fig. 5 ] the figure 5 shows a side view of a wall with integrated formwork according to the invention incorporating a lifting anchor according to the invention.

As illustrated by figures 1 to 5 , the invention relates to a lifting anchor 1 for an integrated formwork wall 2.

Said wall with integrated formwork 2 which is shown in figure 5 comprises a first wall 3 of hydraulic material, preferably concrete, arranged in a first plane P1, a second wall 4 of hydraulic material, preferably concrete, arranged in a second plane P2, the first plane P1 and the second plane P2 being substantially parallel to each other, and at least one connection element (not shown) for connecting and maintaining a distance from each other the first wall 3 and the second wall 4, so as to form between them a filling space 5 of thickness E suitable and intended to be filled with at least one hydraulic material, preferably concrete.

• un élément métallique 6 allongé replié préférentiellement sensiblement en forme de U ou en forme de V qui comprend une base repliée 7, une première branche 8 et une deuxième branche 9 préférentiellement sensiblement parallèles entre elles, disposées dans un même plan,
  la base repliée 7 raccordant lesdites première et deuxième branches 8, 9 entre elles et étant configurée pour être saillante dans l'espace de remplissage 5 et étant configurée pour être apte à être connectée à un engin de manutention (non représenté),
• un élément de compression 10 transverse disposé perpendiculairement auxdites première et deuxième branches 8, 9 étant connecté auxdites première et deuxième branches 8, 9 par des moyens de connexion 11,
  ledit élément de compression 10 comprenant une première portion extrémale 12 et une deuxième portion extrémale 13 respectivement saillantes de la première branche 8 et de la deuxième branche 9.

The lifting anchor 1 which is shown in the figures includes:

• a folded elongate metal element 6 preferably substantially U-shaped or V-shaped which comprises a folded base 7, a first branch 8 and a second branch 9 preferably substantially parallel to each other, arranged in the same plane,
  the folded base 7 connecting said first and second branches 8, 9 to each other and being configured to protrude into the filling space 5 and being configured to be able to be connected to a handling machine (not shown),
• a transverse compression element 10 arranged perpendicular to said first and second branches 8, 9 being connected to said first and second branches 8, 9 by connection means 11,
  said compression element 10 comprising a first end portion 12 and a second end portion 13 respectively projecting from the first branch 8 and from the second branch 9.

• ledit élément de compression 10 présente une section de dimension comprise entre 1600 millimètres carré et 23000 millimètres carré,
• la première portion extrémale 12 et la deuxième portion extrémale 13 sont respectivement saillantes de la première branche 8 et de la deuxième branche 9 d'une distance D1 comprise entre 15 millimètres et 25 millimètres (figure 4).

According to the invention, said lifting anchor 1 is characterized in that:

• said compression element 10 has a section of dimension between 1600 square millimeters and 23000 square millimeters,
• the first end portion 12 and the second end portion 13 are respectively projecting from the first branch 8 and from the second branch 9 by a distance D1 of between 15 millimeters and 25 millimeters ( figure 4 ).

Advantageously, in this configuration and this particular selection, the compression element 10 can be anchored at the level of the first end portion 12 and of the second end portion 13 respectively in the first wall 3 and in the second wall 4, essentially undergoing shear forces during the lifting operation with a handling machine which would exert a lifting force on the folded base 7. The buckling stresses known from the prior art with the lifting pins have completely disappeared. In fact, during the lifting operation, the shearing forces are transmitted to the first end portion 12 and to the second end portion 13, flush with the first and second walls 3, 4. It is for these reasons that the dimensions of the section of the compression element 10 can be considerably reduced compared to those of the lifting pins of the prior art. For example, an integral shuttering wall having a thickness of 40 centimeters will only need a compression member 10 having a section of 45 millimeters in diameter while a lifting axis known from the prior art will require a section. of diameter 100 millimeters to be able to guarantee a maximum payload WLL of 4 tons. This reduction in the size of the section of the compression element 10 makes it possible to overcome the problem of water tightness known from the prior art. It further results from this advantageous configuration and this particular selection, that the first and second branches 8, 9 of the lifting anchor 1 no longer have to be coated respectively in the first and second walls 3, 4, but they can simply protrude into the filling space 5 as illustrated in figure 5 . No sealing of the first and second branches 8, 9 respectively in the first and second walls 3, 4, is required. Thus, the lifting anchor 1 is particularly easy to integrate into the wall with integrated formwork 2, since it is no longer necessary to take into account the positioning of the structural reinforcements of the first and second walls 3, 4 to position the lifting anchor 1. The tests carried out gave maximum WLL payloads of around 3.8 tonnes, which considerably reduces the number of lifting anchors 1 to be used to lift heavy loads and which also limits recourse to use. load balancing systems which are essential beyond two lifting anchors 1 per wall with integrated formwork 2.

Preferably, the first and second branches 8, 9 project relative to the compression element 10 by a distance D2 of between 15 millimeters and 25 millimeters ( figure 3 ).

Advantageously, as the sealing of the first and second branches 8, 9 respectively in the first and second walls 3, 4, is no longer required, their size can be drastically reduced. Consequently, the lifting anchor 1 has the advantage of being very compact because the first and second branches 8, 9 have very small dimensions. The lifting anchor 1 is thus easy to handle and store.

Preferably, according to a first variant embodiment, the connection means 11 consist of a weld ( figure 1 ).

Preferably, according to a second variant embodiment, the connection means 11 consist of a nut and threaded rod assembly ( figure 2 ).

Preferably, the length L1 of the compression element 10 is between 120 millimeters and 560 millimeters ( figures 2 and 3 ).

Thus, the lifting anchor 1 is adapted to be integrated in walls with integrated formwork 2 whose thickness E1 is between 160 millimeters and 600 millimeters ( figure 5 ).

Preferably, the section of said compression element 10 has a shape that is substantially circular or rectangular or square.

The compression element 10 can be solid or hollow ( figures 1 and 2 ).

When the compression element 10 is hollow, a saving in material is advantageously achieved.

The compression element 10 is preferably made of a section of metallic material or the like.

The elongated metal element 6 can be chosen from a rod or a cable, preferably metal or carbon fiber, the rigidity and strength of which allow it to be preferably bent in the shape of a U or V. The section of the l 'metallic element 6 preferably has a diameter d1 of between 8 and 20 millimeters ( figure 3 ).

The invention also relates to a wall with integrated formwork 2 as shown in figure 5 , which is characterized in that it comprises at least one lifting anchor 1 as described according to the invention.

• une première paroi 3 en matériau hydraulique disposée dans un premier plan P1,
• une deuxième paroi 4 en matériau hydraulique disposée dans un deuxième plan P2,
  le premier plan P1 et le deuxième plan P2 étant sensiblement parallèles entre eux, et
• au moins un élément de connexion (non représenté) pour relier et maintenir à distance l'une de l'autre la première paroi 3 et la deuxième paroi 4, de sorte à former entre elles un espace de remplissage 5 d'épaisseur E apte et destiné à être rempli par au moins un matériau hydraulique,
  ladite première portion extrémale 12 et ladite deuxième portion extrémale 13 de l'élément de compression 10 de l'ancre de levage 1 étant intégrées dans le matériau hydraulique respectivement de la première paroi 3 et de la deuxième paroi 4,
  la base repliée 7 étant au moins en partie saillante dans l'espace de remplissage 5 et étant configurée pour être connectée à un engin de manutention.

Said wall with integrated formwork 2 comprises:

• a first wall 3 made of hydraulic material arranged in a first plane P1,
• a second wall 4 of hydraulic material arranged in a second plane P2,
  the first plane P1 and the second plane P2 being substantially parallel to each other, and
• at least one connection element (not shown) for connecting and maintaining at a distance from each other the first wall 3 and the second wall 4, so as to form between them a filling space 5 of thickness E suitable and intended to be filled with at least one hydraulic material,
  said first end portion 12 and said second end portion 13 of the compression element 10 of the lifting anchor 1 being integrated into the hydraulic material of the first wall 3 and of the second wall 4, respectively,
  the folded base 7 being at least partly projecting into the filling space 5 and being configured to be connected to a handling machine.

Preferably and as illustrated by figure 5 , the first and second branches 8, 9 are arranged in the filling space 5.

Thus, the lifting anchor 1 is particularly easy to integrate into the wall with integrated formwork 2 during the manufacture of the latter, since it is no longer necessary to take into account the positioning of the structural reinforcements of the first and second walls. 3, 4 to position the lifting anchor 1.

According to an alternative possibility not shown, the first and second branches 8, 9 are integrated in the hydraulic material of the first wall 3 and of the second wall 4, respectively.

In this case, the sealing of the first and second branches 8, 9, although effective, is not necessary to guarantee maximum WLL payloads of around 3.8 tonnes.

Preferably, said first end portion 12 and said second end portion 13 of the compression element 10 of the lifting anchor 1 are integrated in the hydraulic material respectively of the first wall 3 and of the second wall 4 over an internal anchoring distance D3 of between 15 millimeters and 25 millimeters.

The internal anchoring distance D3 is measured between the internal face of the first wall 3 or of the second wall 4 and the edge of said first end portion 12 or of said second end portion 13.

This advantageous arrangement allows the compression element 10 to take up the shearing forces which are transmitted at the level of said first end portion 12 and of said second end portion 13 during the handling operation by a handling machine which would exert a lifting force on the folded base 7. This prevents buckling of the compression element 10 which occurs in particular for the large diameters known from the prior art and when the lifting force is exerted directly on the compression element 10.

To prevent the lifting force from being accidentally exerted on the compression element 10 when it must be exerted on the folded base 7, it is possible to provide signaling means (not shown) located on the folded base 7 , to indicate that the handling equipment must be connected to the folded base 7.

Preferably, said first end portion 12 and said second end portion 13 of the compression element 10 of the lifting anchor 1 are integrated and anchored in the hydraulic material of the first wall 3 and of the second wall 4 respectively, leaving a outer coating distance D4 preferably greater than or equal to 15 millimeters.

The outer coating distance D4 is measured between the outer face of the first wall 3 or of the second wall 4 and the edge of said first end portion 12 or of said second end portion 13.

Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without thereby departing from the scope of protection of the invention.

Claims (9)

Lifting anchor (1) for wall with integrated formwork (2), said wall with integrated formwork (2) comprising a first wall (3) of hydraulic material arranged in a first plane (P1), a second wall (4) of material hydraulic arranged in a second plane (P2), the first plane (P1) and the second plane (P2) being substantially parallel to each other, and at least one connection element for connecting and maintaining at a distance from each other the first wall (3) and second wall (4), so as to form between them a filling space (5) of thickness (E) suitable and intended to be filled with at least one hydraulic material,
said lifting anchor (1) comprising: - an elongate metal element (6) folded preferably substantially in the shape of a U which comprises a folded base (7), a first branch (8) and a second branch (9) preferably substantially parallel to each other, arranged in the same plane,
the folded base (7) connecting said first and second branches (8, 9) to each other and being configured to protrude into the filling space (5) and being configured to be able to be connected to a handling machine, - a transverse compression element (10) disposed perpendicular to said first and second branches (8, 9) being connected to said first and second branches (8, 9) by connection means (11), said compression element (10) comprising a first end portion (12) and a second end portion (13) respectively projecting from the first branch (8) and from the second branch (9), said lifting anchor (1) is characterized in that : - said compression element (10) has a cross section of dimension between 1600 square millimeters and 23000 square millimeters, - The first end portion (12) and the second end portion (13) are respectively projecting from the first branch (8) and from the second branch (9) by a distance (D1) of between 15 millimeters and 25 millimeters. Lifting anchor according to Claim 1, characterized in that the first and second branches (8, 9) project relative to the compression element (10) by a distance (D2) of between 15 millimeters and 25 millimeters. Lifting anchor according to any one of claims 1 to 2, characterized in that the connection means (11) are chosen from a weld or a nut and threaded rod assembly. Lifting anchor according to any one of claims 1 to 3, characterized in that the length (L1) of the compression element (10) is between 120 millimeters and 560 millimeters. Lifting anchor according to any one of claims 1 to 4, characterized in that the section of said compression element (10) has a circular or rectangular or square shape. Wall with integrated formwork (2) characterized in that said wall with integrated formwork (2) comprises at least one lifting anchor (1) according to any one of claims 1 to 5, said wall with integrated formwork (2) comprising: - a first wall (3) made of hydraulic material arranged in a first plane (P1), - a second wall (4) made of hydraulic material arranged in a second plane (P2),
the first plane (P1) and the second plane (P2) being substantially parallel to each other, and - at least one connection element for connecting and maintaining the first wall (3) and the second wall (4) at a distance from each other, so as to form between them a filling space (5) of thickness (E) suitable and intended to be filled with at least one hydraulic material,
said first end portion (12) and said second end portion (13) of the compression element (10) of the lifting anchor (1) being integrated into the hydraulic material of the first wall (3) and of the respectively second wall (4),
the folded base (7) being at least partly projecting in the filling space (5) and being configured to be connected to a handling machine. Integrated shuttering wall according to Claim 6, characterized in that the first and second branches (8, 9) are arranged in the filling space (5). Wall with integrated formwork according to Claim 6, characterized in that the first and second branches (8, 9) are integrated into the hydraulic material of the first wall (3) and of the second wall (4) respectively. An integrated formwork wall according to any one of claims 6 to 8, characterized in that said first end portion (12) and said second end portion (13) of the compression element (10) of the lifting anchor ( 1) are integrated into the hydraulic material respectively of the first wall (3) and of the second wall (4) over an internal anchoring distance (D3) of between 15 millimeters and 25 millimeters.

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