BOX FOR THE RESERVATION OF ELECTRICAL NETWORKS CAST IN A CONCRETE WALL OR FLOOR

Abstract

The invention relates to a housing (100) for reserving electrical networks (200), said housing being intended to be inserted in its longitudinal direction (x) between two formworks (301, 302) and then cast in concrete during the construction of walls or floors (400), said housing comprising a front part (110) provided with a set of openings (111, 112, 113) allowing the passage of said electrical networks and intended to open out of the wall or floor (400), as well as a rear part (140) intended to be pressed against one of the formworks during the pouring of the concrete, characterized in that said housing comprises a central part (130) interposed between said front part and said rear part, said central part forming a spring in the longitudinal direction (x). Figure [3]

Description

Title of the invention: BOX FOR THE RESERVATION OF ELECTRICAL NETWORKS CAST INTO A CONCRETE WALL OR FLOOR Technical field

[0001] The present invention applies to the field of building and public works, and relates in particular to a box used in the reservation of electrical networks, said box being intended to be inserted between two formwork and then cast in concrete during the construction of walls or floors. State of the art

[0002] It is known from the state of the art to use boxes containing, after the structural work has been completed, electrical equipment such as switches, sockets, telephone contactors and others.

[0003] These types of boxes are intended to be placed between two formwork and then cast in concrete during the construction of a wall or floor. After removal of the formwork, these types of boxes open out on one side of the wall and thus make the electrical equipment they contain accessible.

[0004] In order to adapt to the requirements of modern construction sites, these types of housing must now meet several requirements.

[0005] In particular, they must be able to hold between the concrete formwork without piercing the latter, by mounting and locking a magnet;

[0006] In particular, they must resist slippage at the time of impact of the concrete during pouring, even if this pouring takes place after a relatively long period of time (twenty-four hours or more) after the installation of the box;

[0007] They must also respect the sound insulation of the wall thus created by a reservation of at least 60 mm;

[0008] They must also accommodate the tolerances and width ranges between the benches;

[0009] They must also meet all application cases such as in particular boxes located on the wrong side of the formwork;

[0010] They must also be able to be assembled with other boxes horizontally, vertically, at right angles, with regular center distances and head to tail;

[0011] They must also not trap air bubbles in the soundproofing part, otherwise its effectiveness will be reduced;

[0012] They must also allow free passage of electrical circuits from one side to the other in the transverse axis in the case of twinning of boxes in order to establish networks

[0013] They must also allow the installation and insertion of ICTA of different diameters at the same point in the housing;

[0014] They must also allow the mounting inside the body of the housing of screw or claw devices, using a rotating ring.

[0015] The prohibition, for users, of drilling the formwork to ensure the holding of the covers by rivets, has led manufacturers to develop boxes resting on the two formworks or on one of the formworks, the latter being fixed by magnet.

[0016] However, it is necessary to ensure that the box is held against the formwork when pouring the concrete, in order to obtain a wall or floor that conforms to the plan.

[0017] An aim of the present invention is in particular to propose a housing capable of adapting to different wall or floor thicknesses, and capable of remaining in place during the pouring of the concrete. Statement of the invention

[0018] To this end, the invention relates to a box for reserving electrical networks, said box being designed to be inserted in its longitudinal direction between two formwork, then cast in concrete during the construction of walls or floors, said box comprising a front part provided with a set of openings allowing the passage of said electrical networks and designed to emerge outside the wall or floor, as well as a rear part designed to be placed in abutment against one of the formwork during the pouring of the concrete, said box further comprising a central part interposed between said front part and said rear part, said central part forming a spring in the longitudinal direction.

[0019] Thus, it is understood that the central part, initially relaxed, that is to say at rest, will compress when the two formworks are brought together at the distance corresponding to the thickness of the chosen wall. The front and rear parts are then pressed against their respective formwork. The compression of the central part thus prevents the box from slipping.

[0020] Preferably, the central part forms a spring with a stiffness K of between 10 and 70 N.mm *. This range corresponds to a good compromise between the compression force of 400 N necessary to hold the housing and the maximum force of 1500 N not to be exceeded to allow the formwork to be held in position.

[0021] According to a preferred embodiment, the central portion forming a spring extends longitudinally in a honeycomb structure, the honeycomb structure being oriented in a direction normal to the longitudinal direction.

[0022] Thus, the honeycomb makes it possible to reinforce the resistance of the central part while guaranteeing maximum lightness.

[0023] Advantageously, the honeycomb structure has a diamond-shaped section, the large diagonal of the diamonds being oriented in a direction normal to the longitudinal direction.

[0024] This orientation of the diamonds makes it possible to stabilize the compression direction of the central part and to avoid any lateral displacement.

[0025] According to an improvement, the central part forming a spring extends longitudinally in a honeycomb structure comprising between two and five disjointed rows, preferably three disjointed rows.

[0026] This reduction of the part forming a spring makes it possible to make the structure less rigid while ensuring equal distribution of forces.

[0027] Preferably, the disjointed rows are joined in a direction normal to the longitudinal direction, by means of one or more tabs.

[0028] This addition makes it possible to control the deformation of the central zone and in particular to prevent it from deforming outside the longitudinal plane which contains it.

[0029] Preferably, in the case where the front part and the rear part each have a substantially tubular shape, the honeycomb structure has a thickness e of between 0.2 and 0.5 times the diameter D of the front part and / or the rear part.

[0030] This interval ensures sufficient rigidity and prevents the central part from deforming outside the longitudinal plane which contains it.

[0031] According to another advantageous aspect of the invention, the front part, the central part and the rear part come from a single step of molding a plastic material.

[0032] In this case, the plastic material is preferably chosen from the list defined by Polyethylenes, High Density Polyethylenes and Polypropylenes.

[0033] According to yet another advantageous aspect of the invention, the end of the front part, to which the central part is connected, has a truncated cone shape with a half-angle at the apex substantially equal to 45 degrees.

[0034] This configuration simplifies the installation of ICTA sheaths in the entrances by allowing easier passage of electrical wires, thanks to the direct outlet along the axis of the tubular front part.

[0035] Preferably, said end is provided with facets provided with openings allowing the passage of electrical networks.

[0036] According to yet another advantageous aspect of the invention, at least the front part, and preferably also the rear part, comprises coupling elements for spacers, so as to pair two housings side by side.

[0037] Preferably, the front part comprises means allowing transverse communication between two side-by-side twinned housings.

[0038] According to yet another advantageous aspect of the invention, the front part provided for exit from the wall, and incidentally also the rear part, has a housing designed to accommodate a magnet when fixing the box between the two hips.

[0039] The invention also relates to a concrete wall or floor, comprising a housing according to any one of the preceding claims. Brief description of the FIGURES

[0040] The invention will be better understood on reading the following description, given solely by way of non-limiting example and made with reference to the appended drawings in which: - [Fig.l] is a schematic representation of a non-limiting example of the use of a housing according to an embodiment of the invention in the context of the prefabrication of electrical networks. - [Fig.2] is a schematic side view of a wall incorporating a housing according to one embodiment of the invention. - [Fig. 3] is a schematic perspective representation of a non-limiting exemplary embodiment of a housing according to an embodiment of the invention. - [Fig.4] is a schematic representation along a longitudinal section AA of a non-limiting exemplary embodiment of a housing according to an embodiment of the invention. - [Fig.5] is a schematic representation along a longitudinal section BB of a non-limiting exemplary embodiment of a housing according to an embodiment of the invention.

[0041] It is understood that the embodiments which will be described below are in no way limiting. In particular, it will be possible to imagine variants of the invention comprising only a selection of characteristics described below isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art. This selection comprises at least one preferably functional characteristic without structural details, or with only a part of the structural details if it is this part which is only sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.

[0042] In particular, all the variants and all the embodiments described can be combined with each other if nothing prevents this combination from a technical point of view.

[0043] In the figures and in the remainder of the description, the elements common to several figures retain the same reference. Detailed description of the FIGURES

[0044] [Fig.l] is a schematic representation of a non-limiting exemplary embodiment of a use of a housing according to an embodiment of the invention in the context of the prefabrication of electrical networks.

[0045] The boxes referenced 100 according to the invention are electrical boxes specially designed to be integrated into the walls during the concrete pouring phase. They are intended to accommodate various elements such as electrical conduits, electrical outlets, switches, electrical connection boxes, and other electrical components, connected together by electrical networks referenced 200. The term “Formwork”, referenced 301 and 302 refers to a temporary mold used to give the concrete the desired shape, such as that of a wall or a floor.

[0046] [Fig. 2] is a schematic side representation of a wall referenced 400 integrating a housing according to an embodiment of the invention.

[0047] FIGURES 3, 4 and 5 are schematic representations of a non-limiting exemplary embodiment of a housing according to an embodiment of the invention.

[0048] There is shown a housing which has a mainly longitudinal shape in the sense that it extends mainly in length. The housing is intended to be inserted in its longitudinal direction (x) between two hips 301, 302 and then cast in concrete during the construction of walls, floors or floors 400.

[0049] The housing comprises a front part 110 provided with a set of openings 111, 112, 113 allowing the passage of said electrical networks 200. This front part is designed to open outside the wall.

[0050] The housing also comprises a rear part 140 designed to be placed in abutment against one of the hips 302 during the pouring of the concrete, the front part being placed in abutment on the other formwork 301.

[0051] According to the principle of the invention, the housing comprises a central part 130 interposed between said front part and said rear part, said central part forming a spring in the longitudinal direction (x) of the housing.

[0052] It is thus understood that the central part, initially relaxed, that is to say at rest, will compress when the two hips are brought together at the distance corresponding to the thickness of the chosen wall. The front and rear parts are then pressed against their respective formwork. The compression of the central part thus prevents the box from slipping.

[0053] In this case, the compression of the central part must be adapted to the three precise length ranges, corresponding to the standard wall dimensions of 160 mm, 180 mm, 200 mm.

[0054] Preferably, the central part forms a spring with a stiffness K of between 10 and 70 N.mm '. This range corresponds to a good compromise between the compression force of 400 N necessary to hold the housing and the maximum force of 1500 N at do not exceed to allow the benches to be held in position.

[0055] According to a preferred embodiment, the central portion forming a spring extends longitudinally in a honeycomb structure, the honeycomb structure being oriented in a direction normal (z) to the longitudinal direction (x).

[0056] In other words, the honeycomb structure is in this case a honeycomb structure, said honeycombs extending in the direction (z).

[0057] Thus, the honeycomb structure makes it possible to reinforce the resistance of the central part while guaranteeing maximum lightness. During its deformation, this structure deforms in the plane passing through the axes (x) and (y).

[0058] Advantageously, the honeycomb structure has a diamond-shaped section, the large diagonal of the diamonds being oriented in a direction normal to the longitudinal direction.

[0059] This orientation of the diamonds makes it possible to stabilize the compression direction of the central part and to avoid any lateral displacement in the (y) direction.

[0060] According to an improvement, the central part forming a spring extends longitudinally in a honeycomb structure comprising between two and five disjointed rows, preferably three disjointed rows.

[0061] This reduction of the part forming a spring makes it possible to make the structure less rigid while ensuring equal distribution of forces.

[0062] Preferably, the disjointed rows are secured in a direction normal to the longitudinal direction, by means of one or more tabs 132.

[0063] This addition makes it possible to control the deformation of the central zone and in particular to prevent it from deforming outside the longitudinal plane which contains it. Indeed, the central structure could, under the compressive stresses, bend and consequently deform outside the directions defined by the axes (x) and (y).

[0064] Preferably, in the case where the front part and the rear part each have a substantially tubular shape, the honeycomb structure has a thickness e of between 0.2 and 0.5 times the diameter D of the front part and / or the rear part.

[0065] This interval ensures sufficient rigidity and prevents the central part from deforming outside the longitudinal plane which contains it.

[0066] According to another advantageous aspect of the invention, particularly in terms of manufacturing, the front part, the central part and the rear part come from a single step of molding a plastic material.

[0067] This makes it possible to directly obtain a housing equipped with a spring-forming part following a single molding step, which allows for simplification of manufacturing.

[0068] In this case, the plastic material is preferably chosen from the list defined by Polyethylenes, High Density Polyethylenes and Polypropylenes.

[0069] According to yet another advantageous aspect of the invention, the end 114 of the part front, to which the central part is connected, has a truncated cone shape with a half-angle at the top approximately equal to 45 degrees. Due to this conicity, it is possible to accommodate portions of the electrical network with various orientations.

[0070] As shown in [Fig.3], the front part has a substantially tubular shape provided on its circumference with two openings 112 which correspond to inlets, called “IRO” or “IRL”, allowing the passage of rigid sheaths. The “IRO” (Ordinary Rigid Insulation), or “IRL” (Smooth Rigid Insulation) sheaths or tubes are sheaths, for example made of flame-retardant PVC, allowing electrical cables to be accommodated and circulated in parts in visible (projecting) mounting.

[0071] The end 114 of the front part is provided with facets 116 provided with four openings 113 allowing the passage of electrical networks.

[0072] The four openings 113 correspond to entrances, called “ICTA” (Isolant Cintrable Transversalement Annelé), which accommodate ducts intended for residential buildings, which are both shock and crush resistant and which prevent the spread of flames. They allow the circuits to be embedded in walls, ceilings and floors.

[0073] Coupling elements 120 of the “well” type for distancers allowing two or more boxes to be paired together are advantageously provided to allow the creation of a set of boxes spaced apart by a certain distance (71 mm or 100 mm), thus facilitating the creation of groups of switches or electrical sockets, for example.

[0074] Coupling elements 122 of the groove type may also be provided on the circumferential surface of the front and / or rear parts to allow spacers to be clipped to enable two or more housings to be coupled.

[0075] Also advantageously, means 121 allow transverse communication between two twinned side-by-side boxes. These means consist of a wall which can easily be broken to open a passage on the side of the box, to pass electrical wires from one box to the other.

[0076] According to yet another advantageous aspect of the invention, the front part intended to open out of the wall, comprises an opening 111 intended to accommodate a magnet to allow the housing to be attached to one of the hips.

[0077] The rear part 140 may also include an opening 141 provided to accommodate a magnet to allow the case to be attached to the other hip.

[0078] Now concerning the implementation of the box according to the invention in the manufacture of walls (or floors), a first step involves the preparation of the fixed formwork 301, which will accommodate the formwork boxes 100. To do this, it is necessary to prepare the boxes which will be mounted on it, to implant magnets in these boxes, and to position them at the chosen locations in the wall to integrate a electrical equipment.

[0079] A second step consists of connecting the various boxes in rigid and / or flexible sheaths, thus allowing the passage of the electrical wires and the power supply of all the electrical equipment, the whole forming an electrical network 200.

[0080] For the third step, it is necessary to know the size of the wall in order to adjust its thickness. Once this information has been acquired, it is sufficient to bring the second formwork 302 closer to the first until the desired wall size is reached. In parallel, the box is compressed according to the required wall size (160 mm, 180 mm, 200 mm). The minimum force that is preferably required is 400 N.

[0081] After removing the hips, a wall 400 is obtained integrating several boxes 100 connected by the electrical network 200.

[0082] Of course, the invention is not limited to the examples which have just been described.

[0083] It is possible to envisage other structures for the central part forming a spring, such as helical structures, lattice-like structures superimposed on each other and connected by stiffening legs.

[0084] It may also be envisaged, without departing from the scope of the invention, an elastic material forming a spring, for the central part with sufficient compression capacity.

Claims

Claims

1. Housing (100) for reserving electrical networks (200), said housing being intended to be inserted in its longitudinal direction (x) between two formworks (301, 302) and then cast in concrete during the construction of walls or floors (400), said housing comprising a front part (110) provided with a set of openings (111, 112, 113) allowing the passage of said electrical networks and intended to open out of the wall or floor (400), as well as a rear part (140) intended to be placed in abutment against one of the formworks during the pouring of the concrete, characterized in that said housing comprises a central part (130) interposed between said front part and said rear part, said central part forming a spring in the longitudinal direction (x).

2. Housing (100) for reserving electrical networks (200), according to claim 1, characterized in that the central part forms a spring with a stiffness K of between 10 and 70 N.mm '.

3. Housing (100) for reserving electrical networks (200), according to claim 1 or 2, characterized in that the central part forming a spring extends longitudinally in a honeycomb structure, the honeycomb structure being oriented in a direction normal to the longitudinal direction (x).

4. Housing (100) for reserving electrical networks (200), according to the preceding claim, characterized in that the honeycomb structure has a diamond-shaped section, the large diagonal of the diamonds being oriented in a direction normal to the longitudinal direction.

5. Housing (100) for reserving electrical networks (200), according to claim 3 or 4, characterized in that the central part forming a spring extends longitudinally in a honeycomb structure comprising between two and five disjointed rows, preferably three disjointed rows.

6. Housing (100) for reserving electrical networks (200), according to the preceding claim, characterized in that the disjointed rows are secured in a direction normal to the longitudinal direction, by means of one or more tabs (132).

7. Housing (100) for reserving electrical networks (200), according to any one of claims 3 to 6, in which the front part and the rear part each have a substantially tubular shape, characterized in that the honeycomb structure has a thickness e of between 0.2 and 0.5 times the diameter D of the front part and / or the rear part.

8. Housing (100) for reserving electrical networks (200), according to any one of the preceding claims, characterized in that the front part, the central part and the rear part come from a single step of molding a plastic material.

9. Housing (100) for reserving electrical networks (200), according to the preceding claim, characterized in that the plastic material is chosen from the list defined by Polyethylenes, high density Polyethylenes and Polypropylenes.

10. Housing (100) for reserving electrical networks (200), according to any one of the preceding claims, characterized in that the end (114) of the front part, to which the central part is connected, has a truncated cone shape with a half-angle at the top substantially equal to 45 degrees.

11. Housing (100) for reserving electrical networks (200), according to the preceding claim, characterized in that said end is provided with facets (116) provided with openings (113) allowing the passage of electrical networks.

12. Housing (100) for reserving electrical networks (200), according to any one of the preceding claims, characterized in that at least the front part, and preferably also the rear part, comprises coupling elements (120, 122) for distancers, so as to pair two or more housings side by side.

13. Housing (100) for reserving electrical networks (200), according to the preceding claim, characterized in that the front part comprises means (121) allowing transverse communication between two twinned housings side by side.

14. Housing (100) for reserving electrical networks (200), according to any one of the preceding claims, characterized in that the front part intended to open out of the wall, comprises a housing intended to accommodate a magnet when fixing the housing on the two hips.

15. A concrete wall or floor, comprising a housing according to any one of the preceding claims.

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