FR2789711A1 - Allocation case, and method, for inserting pipeline in slab of reinforced concrete has hollow body with top face sealed with cover, lateral side with aperture for protective barrel, and feet under box - Google Patents

Abstract

Allocation case (1) has hollow body (2) comprising bottom face (3) with 3 feet (4); open top face (5) sealed with lid (6); lateral side (7) with apertures (8) where protective barrel for pipeline can be inserted; and rings (10) attaching case to slab armature. An Independent claim is also included for the method to insert pipeline in slab of reinforced concrete.

Description

The invention relates to the technical field of the incorporation of

  various pipes within structural elements of poured concrete, in situ.

  The invention relates more particularly to the field of the incorporation of

  pipes in reinforced concrete slabs.

  In the above field, it is known to pass electrical conduits or pipes for circulating heating water inside sheaths or protective sleeves which are arranged in the formwork of the slab before pouring the concrete. Most generally, these sleeves must, after the concrete has dried, be accessible from an upper or lower face of the slab in order to allow them to be taken up in order to put them in contact with other sleeves and extend the pipes which they contain in as part of a general network of

  communication, heating or distribution of energy or sanitary water.

  In the context of the incorporation of pipes for circulation of heating or sanitary water, which constitutes the preferred field of application of the invention, the sheaths or sheaths for the protection of the pipes must, for their subsequent recovery, be accessible to from the upper face of the slab after the concrete has dried. In this preferred field of application, it is known to insert, into a block of polystyrene, the ends of the sleeves, intended to be incorporated in the reinforced concrete slab, in order to preserve their freedom with a view to their recovery at from the upper face of the slab. This block of polystyrene, of generally substantially parallelepipedal shape, is placed inside the formwork and fixed to the reinforcements before the concrete is poured. After drying, the polystyrene block is destroyed and extracted from the top of the slab, in order to free the end of the sheaths that it

contains.

  This procedure effectively allows the freedom of the ends of a sheath incorporated in a concrete slab to be preserved and ensures

  the accessibility of its ends from the upper face of the slab.

  However, this method has a number of drawbacks due to the nature of the polystyrene used. A disadvantage lies in the need to forcely insert the end of the sheath into the polystyrene to prevent any

  direct contact between this end and the concrete constituting the slab.

  Another drawback is due to the fragility and particularly deformable nature of the polystyrene block which is liable to be crushed in contact with the reinforcements so that it comes to bear against the bottom of the formwork. However, during the pouring of the concrete, given the relatively large size of the bearing zones of the polystyrene block, as well as a relative embedding of the reinforcements in the polystyrene, the poured concrete is not able to come to encompass the frames nor even fill

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  totally the space between the polystyrene block and the bottom of the formwork. Thus, after the slab has dried and the formwork has been stripped, there are still reinforcing elements not completely surrounded by concrete. Similarly, there are areas on the underside of the slab at which the block of polystyrene is more or less visible. This therefore results, first of all, in areas of weakness of the slab. Even if the volume released by the extraction of polystyrene is filled with concrete, the homogeneity of the slab cannot be fully restored due to the time interval between the initial pouring of the slab and the filling of the space freed up by the removal of the polystyrene block. In addition, even if the underside of the slab is being repaired at the level of the defects caused by the polystyrene block, it is never possible to obtain a uniform visual appearance with the parts.

  of the face formed by the initially poured concrete.

  Another drawback, attached to the use of a block of polystyrene, is due to the considerable volume of waste that its destruction and its extraction generate when the ends of the sleeves are taken up. Indeed, the destruction of a block of polystyrene creates a volume of waste very much greater than the initial volume of the block. It should also be noted that the destruction and extraction, carried out in such a way as to leave as far as possible, no polystyrene waste in the slab, in accordance with construction standards, requires a relatively long time, having considering the generally high number of blocks incorporated

in the same slab.

  It therefore appears the need to have means for incorporating, into a concrete slab, various pipes which allow the pipes to be taken up by the upper face of the slab and which fulfill at least a function equivalent to that of the polystyrene block. while not having any of the drawbacks associated with the implementation of the latter, in particular as regards the difficulties of introducing the ends of the sheath as well as the uniform distribution

  concrete poured around the reinforcements and over the entire surface of the bottom of the formwork.

  In order to achieve these objectives, the invention relates to a reservation box intended to be placed in the formwork of a reinforced concrete slab for incorporation

  in the slab of various pipes.

  According to the invention, this reservation box is characterized in that it comprises a hollow body having: - a bottom provided externally with at least three support feet on the formwork, - opposite the bottom, at the level an upper face, an opening intended to be closed by a cover,

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  - a side wall provided with passage means for at least one protective sleeve of a pipe,

  - And means for attaching the box to the frames of the slab.

  The invention also relates to a cover for such a box.

  Another drawback attached to the use of polystyrene blocks, for the creation of reserve volumes allowing the recovery of the ends of sheaths for incorporating pipes into a concrete slab, lies in the fact that, most often, the face upper part of the polystyrene block is located above the upper filling level of the liquid concrete in the formwork. It is then not possible to proceed, in the region where the polystyrene block exceeds, a finishing of the upper face of the slab by means of a mechanical trowel or helicopter. It is therefore necessary to finish this region by hand, after drying the slab and it

  this then results in additional labor costs.

  In order to remedy these drawbacks, the invention also relates to a

  process for incorporating various pipes into a reinforced concrete slab.

  According to the invention, this method is characterized in that it consists, before pouring the concrete, in: - placing in the formwork at least one incorporation box according to the invention, so as to place the feet of the box resting on the bottom of the formwork, - adjust, if necessary, the height of the box so that the upper face of the cover and the upper part of the body are located below the upper level of concrete pouring, - hang the box on the metal reinforcements of the slab, - introduce at least one protective sheath of a pipe inside the box by the passage means offered by the side wall of the box,

  - close the box with a cover according to the invention.

  In the same direction and according to another characteristic of the reservation box according to the invention, each foot of the latter has means

to adjust its height.

  Various other characteristics emerge from the description given below.

  below, with reference to the accompanying drawings which show, by way of nonlimiting examples, embodiments and implementation of the subject of the invention FIG. 1 is a perspective view of an embodiment of a box

of reservation according to the invention.

  Fig. 2 is a schematic section illustrating the implementation according to a

  process in accordance with the invention of the reservation box.

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  Fig. 3 is an elevation, partially broken away, of a set of boxes

according to the invention.

  The reservation box according to the invention, designated as a whole by the reference I in FIG. 1, comprises a hollow body 2 which has a bottom 3 provided externally with at least three, and preferably four, feet 4 of support on a formwork as will appear later. The body 2 has, opposite the bottom 3, at an upper face, an opening 5 intended to be closed by a cover 6. Preferably but not necessary, the opening 5 defines a mouth in which the cover 6 is intended to be fitted and immobilized

  by conical or pyramidal wedging.

  The body 2 has, between its bottom 3 and its opening 5, a side wall 7 provided with passage means 8 for at least one protective sleeve of a pipe. The hollow body 2 could have any external shape suitable for its function and preferably has a substantially

  hexahedral, so that the side wall 7 has four faces 7 ,, 72, 73 and 74.

  Preferably, a single face 72 of the side wall has means 8 for the passage of several protective sleeves, for example at least three. Of course, this face could have passage means 8 for a higher or lower number of pipes. Similarly, each of the faces 73 to 74 of the side wall 7 may have such passage means 8 for one or more

  pipe protection sleeves.

  The passage means 8 are, for example, constituted, for each sheath, by a perforable region arranged in the side wall 7 to have less resistance to rupture than the rest of the side wall. Preferably but not exclusively, this perforable region defines an annular shape with a diameter less than or equal to the nominal diameter of the sleeve to pass therein, so as to allow, after opening of the perforable region, relative locking of the sleeve by wedging. Similarly, the perforable region can predefine several drilling diameters to allow the use, with the box according to the invention, of sheaths of various

diameters.

  The passage means 8 could be made in any other appropriate manner, such as for example a drilling directly executed in the side wall 7 and closed by means of a removable plug made, for example, in a

  elastically deformable material.

  The hollow body 2 also has means 10 for hooking the box I onto the reinforcements of a slab in which the box I is intended to be incorporated as will appear later. The attachment means could be carried out in any suitable manner and are constituted, in a preferred manner

2789711

  but not exclusive, in the form of a ring 10 for the passage of a link. Preferably, the box 1 includes such attachment means 10 at the level of the

  bottom 3 and substantially in the extension of each of the lateral faces 7, 74.

  The box I and the cover 6 are made of all suitable materials and, preferably, of injected plastic. When the box I and its cover 6 are made of plastic, they can, of course, include ribs

  internal or external ensuring a stiffening function of their structure.

  According to a preferred but not strictly necessary embodiment, each leg 4 has means 15 for adjusting their length or height and therefore the total height of the box. These means 15 are, for example, constituted by at least one mark defining a cutting height of the foot. Such a mark could also materialize a region of weaker resistance at the level of which it would be possible to break the foot. In order to be able to be easily cut while having great resistance, the legs 4 preferably, but not exclusively, have a cross-shaped cross section. In the same direction, to resist significant loads applied to the body 2, the feet are part of the projection of the bottom 3 and are preferably arranged in the extension of the angles formed by the side faces. The adjustment means can also be constituted for each foot by an extension 16 intended to be adapted by fitting on or in the foot 4 when the latter does not have a length or

sufficient height.

  The box 1 thus formed is implemented, in accordance with the invention, according to a process, more particularly illustrated in FIG. 2, incorporation of

  various pipes in a reinforced concrete slab.

  Before pouring the concrete and after placing a formwork 20 and the metal reinforcements 21 of the slab, the box I is placed inside the formwork 20 so as to place its feet 4 resting on the bottom of said formwork. The box 1 is immobilized by means of links 22 passed through the attachment means 10 and around

metal reinforcements 21.

  If necessary, the height of the box I is adjusted so that the upper face of the cover 6 fitted on the box and the upper part of the body 2 are located below the upper level 23 of concrete pouring and therefore of the upper face of the finished slab. To this end, the height of the box is adjusted, preferably but not exclusively, by acting on the height of the feet by the use of adjustment means 15, 16 which represent a preferred embodiment of the invention. It should be noted that the adjustment of the height of the feet also allows an adjustment of the distance separating the bottom 3 of the box from the bottom of the

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  formwork 20 and also the distance separating the bottom 3 of the frame box 21 from the slab. The height of the box is preferably, but not necessarily, adjusted so as to leave a small thickness of concrete above the cover of the box which will be easy to break after drying. The method according to the invention also involves a step of passing at least one sheath 27 for protecting a pipe inside the

  box by the passage means 8 arranged in the side wall 7 of the latter.

  After fitting the sheath 27, the cover 6 is adapted to

  close the opening 5 of the box 1.

  The concrete 28 intended to form the slab can then be poured so that the box 1 is completely embedded there. In order to avoid excessive liquid infiltration into the box 1, the cover 6 is fitted on the body 2 so as not to detach from it under the effect of Archimedes' push, so as to ensure a certain sealing. In the same direction, the passage means 8 sufficiently follow the

  contours of the sheath 27 to limit such infiltration.

  Given the existence of the feet 4, the box is kept at a sufficient distance from the bottom of the formwork so as not to obstruct the passage of the concrete and the complete covering of the bottom of the formwork. In the same direction, the small relative volume of the feet relative to the volume existing between the bottom 3 and the formwork 20 allows, during the vibration of the concrete, a homogeneous distribution of the latter over the entire surface of the formwork so that, after drying and formwork, there will be no surface defect at the underside of the slab. In addition, the feet 4 allow to leave, between the bottom 3 of the box and the metal frames 21, sufficient space to allow a suitable surrounding of the frames 21 by the concrete 28, so that the consistency of the slab is preserved . Likewise, the feet 4, in direct contact with the bottom of the formwork, prevent any collapse of the box in the event of an impact or of being pressed on it. Thus, the box according to the invention can advantageously support the station of an operator, during the pouring of the concrete.

  for example, without its setting being altered.

  Furthermore, given the fact that the box I is completely embedded in the concrete 28, it is possible to finish the slab by means

  with a mechanical trowel without the box 1 obstructing its operation.

  Thus, the implementation of the reservation box, in accordance with the invention, makes it possible to simplify the operations of finishing the slab by not imposing a recovery of the zone located near the box, as is the case when using a block of

  polystyrene in accordance with prior practice.

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  After drying of the concrete, it suffices, to access the end of the sheath 27 disposed in the box, to break the concrete plug 29, having a small thickness, located above the cover 6 and then to break the latter to access the internal space of the box and freeing the free end of the sheath 27. Preferably but not strictly necessary, the cover 6 has for this purpose zones of less resistance to facilitate its breaking. It should be noted that, advantageously, the breakage of the concrete plug 29 generates only a small volume of

  rubble easy to evacuate or reuse.

  After extraction of the free end of the sheath 27 from the box 1, concrete is poured inside the latter to fill it completely and reach the upper level of the slab. It could also be envisaged to close the box with a new cover 6 having resistance characteristics in accordance with the destination of the slab. In the same direction, it could be envisaged, when opening the reservation box 1, after drying of the slab, not to break the cover 6 so as to be able to replace the latter after recovery of the free end of the sheath 27. In the latter case, the cover 6 has means for passage

  at least one sleeve 27 outside the box 1.

  According to the preferred embodiment of the process according to the invention, the

  The height of the box is adjusted by adjusting the height of the feet.

  However, the height of the box can also be adjusted by

  the addition of extensions at the mouth of the box.

  According to a preferred characteristic of the box 1, the open internal volume of the body 2 has a shape complementary to that of the external volume including the feet 4 and at least part of the side wall 7 for, as shown more particularly in FIG. 3, authorize nesting into each other of at least two

  reservation boxes I substantially identical.

  This preferred feature of the box I advantageously allows stacking of several boxes one inside the other in order to reduce the storage volume. Of course, the internal and external volumes of the body 7 are defined so as to leave sufficient clearance to allow nesting and disengagement, without significant effort, of the boxes of

  booking one inside the other.

  To this end, the body 2 has, preferably but not exclusively, a pyramidal trunk shape converging towards the bottom 3, and the feet 4 are part of

  the extension of the four faces 71 to 74 of the side wall 7.

  According to another characteristic of the invention, there is a set of at least two and, preferably, three substantially identical boxes which are connected

  two by two, at their side wall, by at least one breakable bridge 30.

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  The assembly thus formed can then be implemented in the parts of a slab o

  must intervene the recovery of a set of sheaths incorporated in the slab.

  The set of several boxes, linked by breakable bridges, also has the advantage of making it possible to easily adjust the volume of incorporation available, according to the specific needs of the site. Indeed, assembled boxes can be used, both together and separately, after rupture

bridges.

  The invention is not limited to the examples described and shown, because

  various modifications can be made without departing from its scope.

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Claims (11)

CLAIMS:   1. Reservation box, intended to be placed in the formwork (20) of a reinforced concrete slab for incorporation into the slab of various pipes, characterized in that it comprises a hollow body (2) having: - a bottom (3) provided externally with at least three support feet (4) on the formwork (20), - opposite the bottom (3), at an upper face, an opening (5) intended to be closed by a cover (6), - a side wall (7) provided with means (8) for passage for at least one sheath (27) for protecting a pipeline, - and means (10) for hanging of the box on the slab reinforcement. 2. Reservation box according to claim 1, characterized in that the passage means are defined for each sheath by a perforable region arranged in the side wall (7) to have less resistance to breakage than the rest of the side wall.   3. Reservation box according to one of claims 1 or 2, characterized   in that each leg (4) has means for adjusting (15, 16) its height.   4. Reservation box according to one of claims I to 3, characterized   in that the open internal volume of the body (2) has a shape complementary to that of the external volume including the feet (4) and at least part of the side wall (7) to allow nesting, one in the other, at least two boxes   of reservation (1) substantially identical.   5. Reservation box according to one of claims there 4, characterized in   that the body (2) has a substantially truncpyramidal outer shape   converging towards the feet (4) of the box.   6. Lid for a reservation box (I) according to one or other of the claims 1 to 5.   7. Lid according to claim 6, characterized in that it is intended for   fit into the mouth of the opening of the body (2) of the box.   8. Lid according to claim 6 or 7, characterized in that it has a breakable upper face to allow easy access to the interior of the box (1) after the slab has dried.   9. Foot extension for a box (1) according to claim 3, characterized in that it is intended to be fitted into or on a foot (4) of the   box, to form means for adjusting the height of said foot. 2789711   10. Set of at least two boxes (1) according to one of claims 1 to   , characterized in that they are linked at the level of their side wall by at least one breakable trigger guard (30).   11. Method for incorporating various pipes into a reinforced concrete slab, characterized in that it consists, before pouring the concrete, in: - placing in the formwork at least one incorporation box (1)   according to one of claims 1 to 5, so as to place the feet of   the boot resting on the bottom of the formwork, - adjust, if necessary, the height of the box (1) so that the upper face of the cover (6) and the upper part of the body (2) are located below the level concrete pouring upper, - hang the box on the metal reinforcements (21) of the slab, - introduce at least one sheath (27) to protect a pipe inside the box by the passage means (8) offered by the side wall (7) of the box, - close the box (1) by means of a cover (6) according to one of claims 6 to 8.