EP3143219A1 - Coffrage pour le coulage d'une dalle de béton, structure pour le coulage d'un plancher, d'un toit ou d'un plafond, procédé de coulage d'une dalle de béton, et dalle de béton - Google Patents

Coffrage pour le coulage d'une dalle de béton, structure pour le coulage d'un plancher, d'un toit ou d'un plafond, procédé de coulage d'une dalle de béton, et dalle de béton

Info

Publication number
EP3143219A1
EP3143219A1 EP15730268.8A EP15730268A EP3143219A1 EP 3143219 A1 EP3143219 A1 EP 3143219A1 EP 15730268 A EP15730268 A EP 15730268A EP 3143219 A1 EP3143219 A1 EP 3143219A1
Authority
EP
European Patent Office
Prior art keywords
membrane
formwork
concrete
elements
poured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15730268.8A
Other languages
German (de)
English (en)
Other versions
EP3143219B1 (fr
Inventor
Johan Fierlafijn
Frédéric OTTE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aquadraat Engineering bvba
Original Assignee
Aquadraat Engineering bvba
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aquadraat Engineering bvba filed Critical Aquadraat Engineering bvba
Publication of EP3143219A1 publication Critical patent/EP3143219A1/fr
Application granted granted Critical
Publication of EP3143219B1 publication Critical patent/EP3143219B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element

Definitions

  • Formwork for pouring a concrete slab construction for pouring a floor, roof or ceiling, method for pouring a concrete slab, as well as a concrete slab.
  • the present invention concerns a formwork for pouring a concrete slab.
  • the present invention in particular relates to such a formwork designed to be mounted on an underlying supporting structure, whereby overhanging portions of the concrete slab to be formed form a span between supporting parts of the bearing structure and whereby a reinforcement is provided in the concrete slab to be formed.
  • a formwork according to the invention is designed for pouring a concrete slab to cover a water management facility, such as for example an underground facility for the infiltration of rain water, a facility for buffering rain water or an underground water storage or the like, or to cover a crawl space or the like in house-building, but the invention is not restricted to these applications.
  • a water management facility such as for example an underground facility for the infiltration of rain water, a facility for buffering rain water or an underground water storage or the like, or to cover a crawl space or the like in house-building, but the invention is not restricted to these applications.
  • infiltration units or buffer units are provided in a building pit to that end, which are comparable to a kind of plastic crates or supports with an open structure and which are often stackable and/or can be mutually coupled to form large, underground open constructions in which water can be collected.
  • underground constructions also form a bearing structure on which a concrete slab can subsequently be poured or on which a footing or the like can be provided.
  • a cover in the shape of a layer of sand or some foundation package, and only then is provided a reinforced road hardening, for example made of concrete, asphalt, clinkers or other materials, selected as a function of the load class or on any other basis.
  • a disadvantage of these known methods for constructing underground water management facilities is that the used plastic infiltration units are very expensive.
  • Another disadvantage associated with the use of said plastic infiltration units is that their installation requires great precision, since the different infiltration units should closely connect. This requires among others also a very precise finish and alignment of the bottom of the building pit itself.
  • the present invention aims to provide a solution to one or more of the aforesaid and/or other disadvantages.
  • the invention aims to provide a solution which makes it possible to pour a concrete slab on top of a bearing structure in a very simple, extremely fast and efficient manner.
  • Another object of the invention is to simplify the construction of the actual bearing structure for the concrete slab as much as possible.
  • Yet another aim of the invention is to make as much use as possible of relatively inexpensive materials which are widely available in the building industry and which can be easily assembled with conventional techniques and connecting means.
  • the present invention concerns a formwork for pouring a concrete slab, which contains a membrane made of a plastic foil or tarpaulin or the like, whereby the membrane forms a supporting part of the formwork which can bear concrete to be poured while it cures.
  • the strength of the invention lies in the fact that it goes against all currently prevailing thoughts, which leads to some surprising effects which moreover strengthen one another.
  • invariably rigid elements are used for assembling a formwork in the assumption, on the one hand, that this is necessary to absorb the large pressures under the weight of the concrete, and on the other hand because non-rigid elements inevitably have a certain deflection, as a result of which the measurements which are usually imposed on the construction cannot be respected or the result which is finally obtained will be considered to be unpredictable.
  • a first major advantage of a formwork according to the invention is indeed that its membrane is bendable or flexible, and possibly even elastic and stretchable, as a result of which certain alignment errors are easily, by itself as it were, absorbed in the bearing structure for the concrete slab, so that larger tolerances in the finishing of this bearing structure are more acceptable than is the case with the conventional techniques, which moreover makes it possible to speed up the building process.
  • the membrane not only adjusts to possible deviations in the bearing structure, of course it also deflects under the pressure of the concrete in locations where it is not supported by the bearing structure.
  • Another major advantage of such a formwork according to the invention is that it can be installed very quickly and efficiently.
  • the invention also concerns a construction for pouring a floor, ceiling or roof, whereby the construction comprises a formwork according to the invention as described above.
  • the formwork is provided on a bearing structure, whereby the formwork is designed for pouring a concrete slab on the bearing structure, whereby overhanging portions of the concrete slab to be poured form a span between supporting parts of the bearing structure and whereby a reinforcement is provided in the formwork, whereby the membrane of the formwork at least partially spans the bearing structure and is designed for bearing poured concrete for the concrete slab, in particular in the overhanging portions, and for making it rest on the supporting parts.
  • the bearing structure comprises one or several of the following elements:
  • the invention also relates to a method for pouring a concrete slab to cover a water management facility, whereby the concrete slab must rest on an underlying supporting structure and whereby overhanging portions of the concrete slab form a span between supporting parts of the bearing structure.
  • the invention relates to such a method including at least the following steps:
  • the invention also relates to a concrete slab covering a water management facility, whereby the concrete slab rests on an underlying supporting structure, whereby overhanging portions of the concrete slab form a span between supporting parts of the bearing structure and whereby the concrete slab shows a certain deflection between the supporting parts of the bearing structure amounting to at least 1/200, better still at least 1/100 and preferably at least 1/50 of the distance between the corresponding supporting parts nearby.
  • the deflection is obtained in a simple manner with a formwork according to the invention which is provided with a flexible membrane and which makes sure that the supporting parts are firmly anchored in the concrete slab.
  • figure 1 is a cross-section through a first embodiment of a formwork according to the invention, whereby the middle portion is omitted;
  • figure 2 shows the portion indicated by F2 in figure 1 to a larger scale
  • figure 3 shows a top view of a portion of the formwork indicated by F3 in figure 2;
  • figure 4 shows a cross-section through a construction according to the invention for pouring a floor, whereby the formwork from figure 1 has been provided on a bearing structure;
  • figure 5 shows the portion indicated by F5 in figure
  • figure 6 shows the condition, in an analogous manner as in figure 5, after the concrete for the floor has been poured;
  • figure 7 shows a top view of a bearing structure provided in a building pit
  • figure 8 is a side view according to arrow F8 in figure 7, whereby the middle portion has been omitted for clarity's sake;
  • figure 9 shows a view according to arrows F9 of a portion of the building pit after a second embodiment of a formwork according to the invention has been provided and concrete has been poured in the formwork;
  • figure 10 shows the portion indicated by F10 in figure 9 to a larger scale
  • figure 11 is a top view according to arrow Fll in figure 12 of a portion of a construction according to the invention whereby a third possible embodiment of a formwork according to the invention has been applied;
  • figure 12 shows a cross-section through the above- mentioned construction after the concrete has been poured in this formwork
  • FIG. 13 and 14 show the portions indicated by F13 and F14 in figures 11 and 12 respectively to a larger scale; and, figures 15 and 16 show the portions indicated by F15 and F16 in figures 11 and 12 respectively to a larger scale .
  • the first embodiment of a formwork 1 in accordance with the invention represented in figures 1 to 3 has a rectangular shape in a plan view, whereby its perimeter is formed of lateral elements 2 which in this case consist of concrete support blocks 3.
  • These concrete support blocks 3 may for example be concrete blocks having a length of 50 cm, a height of 30 cm and a thickness of 14 cm.
  • small reinforced concrete beams can be used having a length of 1 m to 2 m and a square cross-section of 14 cm by 14 cm.
  • opposite lateral elements 2 are mutually connected by means of transverse elements 6.
  • transverse elements 6 are formed of hollow steel pipes 7, but other types of transverse elements 6, for example in the shape of a steel reinforcement or the like, are not excluded either according to the invention.
  • the steel pipes 7 may for example typically have a diameter of about 35 mm, but other dimensions are not excluded of course.
  • the inserts 9 are not rigidly connected to the hollow steel pipes 7 in this case, but it is not excluded to apply such a rigid connection, for example by means of a welded joint or the like.
  • Such an insert 9 is further provided with a support piece 12 against which a far end 8 of the steel pipe 7 can rest and with which a force can be transmitted onto a support block 3.
  • the other far end 13 of the inserts 9 is anchored in the concrete support block 3 concerned.
  • the far end 13 of said insert 8 can be provided directly in the uncured substance during the manufacture of the concrete support block 3, or it may be anchored in the support block 3 later on, for example by boring and applying a plug or chemical anchor or the like.
  • a plug or chemical anchor or the like for example by boring and applying a plug or chemical anchor or the like.
  • these reinforcement meshes 14 are dimensioned such that the concrete slab to be poured can handle the required load, for example the load of traffic passing over the concrete slab to be poured.
  • reinforcement meshes 14 with an aperture 15 of 150 mm could be used and with reinforcement bars 16 having a diameter of for example 6 mm, but other dimensions are not excluded either.
  • a formwork 1 special is that it includes a membrane 17 formed of a plastic foil or tarpaulin or the like, whereby the membrane 17 forms a supporting part of the formwork 1 which can support the concrete to be poured while it cures.
  • the membrane 17 may for example be a PE film (polyethylene) which is at least pliable and flexible and it may also exhibit a certain elasticity, depending on the application .
  • PE film polyethylene
  • the aim is that, after the concrete has been poured, the membrane 17 of the formwork 1 undergoes a certain sag due to its bendability or elasticity, such that alignment errors can easily be absorbed and a large stability of the construction is obtained .
  • the membrane 17 is fixed and to this end, in the given example of figures 1 to 3, it adheres with its edges 18 to a portion of the formwork 1 itself, more specifically to the support blocks 3.
  • concrete anchors 19 are used in this case, but of course many other means can be used to that end.
  • the membrane 17 is hereby stretched between the two opposite sides 4 of the perimeter of the formwork 1.
  • the lateral elements 2 of support blocks 3 are held at a fixed distance from each other by the hollow steel pipes 7 and the inserts 9. The tension force for stretching the membrane 17 is thus absorbed by the hollow steel pipes 7.
  • An advantage of the use of hollow steel pipes 7 consists in that such hollow pipes 7 are able to absorb proportionally larger bending moments than full pipes or reinforcement bars of the same weight.
  • the aim is for the whole steel frame formed of the steel pipes 7 to be embedded along in the concrete to be poured.
  • the use of hollow steel pipes 7 as a reinforcement is not necessarily readily accepted, as a result of which the contribution of the hollow steel pipes 7 to the reinforcement of the concrete slab may be excluded from the strength calculation.
  • a design in which the hollow steel pipes 7 are excluded from the strength calculation will usually contain more steel than a similar design, whereby the support blocks 3 are connected by means of transverse elements 6 consisting of reinforcement bars.
  • Figures 4 to 6 represent a construction 20 in accordance with the invention for pouring a concrete slab 21, more specifically a floor or a roof 21 to cover a water management facility, in this case an infiltration basin 22.
  • the concrete slab 21 hereby forms a paved area and may for example be a parking lot, a road, a square or the like.
  • a bearing structure 24 to this end which includes a regular pattern of concrete poles 25 in the middle and whereby the edges 26 of the building pit 24 are bordered with a belt made of plastic (for example PP) infiltration units 27.
  • the poles 25 are poles 25 built of concrete blocks 28, whereby a concrete pad 29 forms the foot of each pole 25 and in this case each time two concrete blocks 28 are cemented on said concrete pad 29.
  • the pads 29 of the poles 25 are intended to better spread the load which is to be transferred to the ground via the poles 25 over the ground surface and thus prevent sagging of the poles 25.
  • bearing structure 24 many other elements can be used to build a bearing structure 24, such as for example plastic columns provided with a pad, prefab concrete cones, retaining wall elements, steel frames and the like.
  • the building pit 23 is provided beforehand with a coating 30 which in this case consists of a geotextile 30.
  • the aim is that rain water which ends up in the infiltration basin 22 after a rain shower can penetrate in the soil through the geotextile 30.
  • the aim may be for example to prevent this infiltration of rain water into the ground and to temporarily store the rain water in the well 22 for other use or to discharge it in a controlled manner from the well 22 to a sewer or drain or the like.
  • the building pit 23 may for example be coated with a waterproof layer.
  • the construction 20 further comprises a formwork 1 as discussed above with reference to figures 1 to 3.
  • the formwork 1 is hereby provided on the bearing structure 24, whereby the formwork 1 is of course designed for pouring the concrete slab 22 on top of the bearing structure 24.
  • the aim is not to make the formwork 1 beforehand and to then put it over the bearing structure 24.
  • overhanging portions 31 of the concrete slab 21 to be poured form a span 31 between supporting parts 32 of the bearing structure 24.
  • the supporting parts 32 are in this case formed of the poles 25 and the infiltration units 27.
  • the reinforcement meshes 14 which are provided in the formwork 1 make sure that the concrete slab 22 is able to support the load in the overhanging portions 31 and can transmit it to the ground via the poles 25.
  • the membrane 17 of the formwork 1 spans the entire bearing structure 24 and is designed to bear poured concrete 33 for the concrete slab 21, in particular in the overhanging portions 31, and to make it rest on the supporting parts 32.
  • the membrane 17 forms a bearing portion of the formwork 1, and consequently the membrane 17 must be sufficiently rigid to be able to bear the weight of the liquid concrete until this concrete has cured.
  • a sag D of the membrane is moreover obtained in the overhanging portions 31.
  • said sag D amounts to at least 1/200, better still at least 1/100, preferably more than 1/50 and even more than the distance L between the nearby supporting parts 32 concerned, i.e. the length L of the span 31.
  • the membrane 17 of the formwork 1 is fixed in the formwork 1 itself.
  • the membrane 17 may for example be additionally fixed to one or several supporting parts 32 of the bearing structure 24.
  • a membrane 17 with a certain elasticity may be used, but this is not necessarily the case.
  • the membrane 17 can be fixed to two opposite sides 4 and 5 and be provided with a certain 'extra length' , whereby the distance between the opposite sides 4 and 5 is thus shorter than the corresponding dimensions in the direction concerned of the membrane 17.
  • the membrane 17 may obtain the required deflection between the supporting parts 32 while the concrete 33 is being poured.
  • a reinforcement may be applied for example with protruding parts which already deform the membrane 17 in accordance with the deflection to be achieved in the overhanging portions 31 before the concrete 33 is poured.
  • the membrane 17 of the formwork 1 may be stretched before the concrete 33 is actually poured, which may benefit the practical feasibility and execution speed.
  • Figure 7 shows a top view of another embodiment of a bearing structure 24, whereby this time the building pit 23 is bordered by poles 34 instead of infiltration units 27, as was the case in the previous example.
  • the infiltration basin 22 is further sealed by means of sheet material 35 provided on the poles 34 forming the perimeter of the infiltration basin 22.
  • Figures 9 and 10 represent the situation after a concrete slab 21 has been poured on said bearing structure 24 with the aid of a formwork 1 according to the invention, although carried out differently this time.
  • the formwork 1 of figures 9 and 10 includes lateral elements 2 which have the shape of a steal beam or girder 36 this time, with an L-shaped cross-section in the given example .
  • the transverse elements 6 of the formwork 1 are made of reinforcement steel 37 and are no longer formed of hollow steel pipes 7, as was the case in the preceding example.
  • sleeves 38 Transversely to the steel girders 36, sleeves 38 have been welded in which said reinforcement steel can be tightly fit.
  • the lateral elements 2 are again maintained at a fixed distance from one another.
  • the reinforcement steel 37 is made sufficiently heavy to absorb the tension force for stretching the membrane 17 of the formwork 1.
  • the membrane 17 is stretched between the metal girders 36 and fastened to these girders with appropriate means 39.
  • a membrane 17 made of HDPE high density polyethylene
  • a HDPE extrusion weld 30 can be used as a fender.
  • the formwork 1 is further surrounded by lateral panels 40 to form a shell in which the concrete 33 can be poured.
  • the lateral panels 40 are mounted fixed to the sheet material 35 of the bearing structure 24.
  • edges 18 of the membrane 17 also cover the inside of the lateral panels 40, such that the entire membrane 17 forms the actual shell for the concrete 33.
  • FIGS 11 to 16 illustrate yet another possible working method.
  • a bearing structure 24 In a building pit 23 is provided a bearing structure 24, similar to that of the situation represented in figure 7. On this bearing structure 24 is provided a formwork 1 according to the invention, but carried out differently and whereby a concrete 33 is poured in the formwork 1.
  • the formwork 1 of figures 11 to 16 includes lateral elements 2 which, as in the preceding example of figures 9 and 10, are formed of a steel beam or girder 36 having again an L-shaped cross-section in this example.
  • the aim here is not that these steel transverse elements 41 remain permanently in the concrete 33, but the purpose is precisely to take them away after the concrete 33 has cured .
  • holes 42 have been provided in the metal girders 36 and, through opposite holes 42 in the pair of girders 36, plastic transverse elements 43 are first provided extending between the two opposite girders 36.
  • plastic transverse elements 43 are designed as hollow wall duct tubes 43, made for example of PVC or HDPE, and they do form a part of the formwork 1 which remains permanently in the concrete 33, and they are designed to form a shield between the concrete 33 to be poured and the steel transverse elements 41 which are provided in the wall duct tubes 43 after these plastic wall duct tubes 43 have been put in place in order to temporarily absorb the tension force.
  • the plastic wall duct tubes 43 In order to form a sealed entity in the formwork 1 for the liquid concrete 33, the plastic wall duct tubes 43 must of course have a diameter corresponding to the holes 42 in the metal girders 36.
  • the diameter of the hollow steel pipes 41 is preferably sufficiently smaller than the diameter of the wall duct tubes 43 in order to facilitate the insertion of the steel pipes 41 in the wall duct tubes 43.
  • the hollow steel pipes 41 consist of short segments 44 of for example 1 to 2 metres that are coupled to one another. As is represented in greater detail in figures 15 and 16, said coupling of the segments 44 is in this case achieved with intermediate steel pins 45, each time provided between two segments 44, but other methods are not excluded either.
  • the hollow steel pipes 41 extend through the girders 36 and rest on either side on a flange 46 which can be screwed down on the steel girder 36 concerned by means of nuts 47, which is represented in greater detail in figures 13 and 14. In this manner, the segments 44 can be firmly pressed together to thus absorb the tension force of the membrane 17.
  • the membrane 17 is introduced under the girders 36 and fixed on the outside of the girders 36.
  • reinforcement meshes 14 as in the case of figure 1, for example .
  • the aim is not only to remove the segments 44 and pins 45, but also the metal girders 36. This can be done in a simple manner in this case by first loosening the membrane 17 and then further tightening the nuts 47, as a result of which the girders 36 will move apart and be peeled away from the formed concrete slab 21, which considerably facilitates the formwork removal.
  • formwork oil should be provided on the metal frame of the formwork 1.
  • the steel transverse elements 41 in this case only form a temporary construction.
  • the formwork 1 according to the invention contains parts which are left behind after the pouring of the concrete 33 and thus form parts of a formwork 1, but also temporarily provided parts.
  • This third embodiment has as a major advantage that the actual reinforcement formed by the reinforcement meshes 14 can be used more effectively.
  • the first embodiment of figures 1 to 6 is indeed disadvantageous in that the hollow steel pipes 7 which remain permanently in the concrete 33 do not actually count as reinforcement, which increases the price of the solution and makes the construction relatively heavy.
  • these pipes 7 are situated in the central zone of the concrete 33, where they are least effective to absorb bending moments .
  • This third embodiment of a formwork 1 according to the invention therefore offers an even more practical and more economical solution and also offers all the advantages of the preceding embodiments, for example with regard to the achievement of a sag D and the like.
  • a formwork 1 is used for pouring a concrete slab 21 and to that end includes a membrane 17 consisting of a foil or tarpaulin or the like made of plastic, whereby the membrane 17 forms the support that bears the concrete 33 to be poured for the concrete slab 21 while it cures.
  • the membrane 17 is preferably made of a plastic without reinforcement or fibres, for example a non-fibre- reinforced PE foil (polyethylene) with a certain elasticity .
  • This provides for a sag D of the concrete 33 to be poured.
  • the formwork 1 preferably has a perimeter provided on at least two opposite sides with lateral elements 2, and whereby the membrane 17 is fixed and to this end is fastened to the lateral elements 2 of the formwork 1.
  • the membrane 17 is prestretched before the concrete 33 is being poured.
  • the membrane 17 which serves to bear the concrete 33 will also stretch under the weight of the concrete 33, which may be associated with an excessive sag which can be avoided by prestretching the membrane 17.
  • the membrane 17 is preferably prestretched between at least two opposite sides 18 of its perimeter.
  • the formwork 1 is provided on opposite sides 4 and 5 with one or several lateral elements 2, whereby opposite lateral elements 3 or 36 on the opposite sides 18 of the membrane 17 are mutually connected by transverse elements 6.
  • transverse elements 6 keep the lateral elements 2 at a distance from one another and absorb the tension force for prestretching the membrane 17, as well as the additional tension force which is present after the concrete 33 has been poured until this concrete 33 has cured .
  • the transverse elements 6 are preferably formed of pipes 7 or tubes or the like, such that they are highly resistant to bending.
  • Transverse elements in the shape of pipes 7 preferably have a minimal diameter of 30 mm or even 45 mm and a wall thickness between 2 mm and 5 mm, or even between 2.5 mm and 3 mm.
  • retaining means 19 are provided on opposite sides 18 of the membrane 17 for retaining the membrane 17, as well as tightening means with which the retaining means 19 can be moved in relation to one another for stretching the membrane 17.
  • the retaining means may be formed of concrete anchors 19 which are anchored in the lateral elements 2, whereby in this case the tightening means may consist for example of means with which the length of the transverse elements can be adjusted and thus also the distance between the lateral elements 2, such that the membrane 17 is stretched more or less, according to the case.
  • the retaining means themselves can be arranged in a movable manner, whereby more or less tension is put on the membrane 17 by moving the retaining means towards one another or by moving them apart, as appropriate .
  • the tension force resulting from the stretching of the membrane 17 during the prestretching and the subsequent load under the pressure of the poured concrete 33 results in a buckling load P on the separate transverse elements 6.
  • transverse elements 6 should hereby be manufactured and dimensioned such that they are able to resist said buckling load P, or in other words: ⁇ 2 ⁇ £ ⁇ / whereby:
  • - E is the modus of elasticity of the material out of which a transverse element 6 is made
  • - I is the area moment of inertia of the cross-section of a transverse element 6;
  • the transverse elements 6 according to the invention extend in a plane parallel to the membrane 17 at a distance from the plane of the membrane 17, for example at a distance which typically amounts to 15 to 20 mm.
  • the far ends of the transverse elements 6 are hereby anchored in the lateral elements 2, in such a way that they are connected in a non-sliding manner to the lateral elements 6.
  • the anchoring of the transverse elements 6 in the lateral elements 2 is further such that the lateral elements 2 cannot undergo a tilting movement as a result of the tension force exerted by the membrane 17 on the lateral elements 2 on the one hand, and the pressure force exerted by the transverse elements 6 on the lateral elements 2 on the other hand, taking into account the distance between the planes in which said forces occur.
  • the transverse elements 6 are reusable, for example for pouring a concrete slab 21 at a different location .
  • Such reusable transverse elements 6 may for example be metal pipes 7 or tubes that are encased in surrounding lost pipes of the formwork 1, such as for example lost pipes made of a plastic such as PVC.
  • the reusable transverse elements 6 are provided such on the lateral elements 2 that they do not end up in the concrete 33 to be poured, so that they can be smoothly removed after the concrete 33 has been poured .
  • the transverse elements 6 are formed of steel pipes 7 with a diameter of at least 30 mm and with a wall thickness between 2 and 5 mm, whereby successive transverse elements 6 are provided between the lateral elements 2 on a centre to centre distance of 30 cm or even 90 cm or more, and whereby the bottom of the pipes is situated 10 mm to 100 mm or even 15 mm to 20 mm above the membrane 17.
  • the invention also concerns a construction 20 for pouring concrete 33 to form a predominantly horizontal span 31, such as a floor, a roof or a ceiling or the like.
  • This span 31 is provided between supporting parts 32 of an underlying supporting structure 24 formed of vertical elements such as walls, vertical columns 25 and the like.
  • a formwork 1 in accordance with the invention is provided on the bearing structure 24.
  • This formwork 1 is designed for pouring a concrete slab 21 on the bearing structure 24, whereby the membrane 17 of the formwork 1 extends over the underlying supporting structure 24 and forms the bearing surface to bear the concrete 33 to be poured for the concrete slab 21 while it cures .
  • a typical feature of the invention is that it is characterised in that the membrane 17 is freely suspended and is not supported at the location of the span 31 between the supporting parts 32, but rests directly on the supporting parts 32 formed by the vertical elements 25.
  • the bearing structure 24 may for example include several columns 25, whereby the end faces of these columns 25 form the above-mentioned supporting parts 32.
  • the membrane 17 of the formwork 1 extends over the end faces of said columns 25, whereby the membrane 17 rests directly on the above-mentioned supporting parts 32 of the columns 25.
  • the supporting parts 32 of the underlying supporting structure 24 are formed of several vertical elements situated at a mutual centre to centre distance from one another amounting to at least 40 cm and maximally 120 cm, or even at least 50 cm and maximally 100 cm.
  • the supporting parts 32 of the underlying supporting structure 24 consist for example of several vertical elements whose width amounts to at least 6 cm and maximally 30 cm, or even at least 10 cm and maximally 20 cm.
  • the invention also concerns a method for pouring concrete 33 to form a predominantly horizontal span 31, such as a floor, a roof or a ceiling or the like, between supporting parts 32 of an underlying supporting structure 24 formed of vertical elements 25 such as walls, vertical columns 25 and the like.
  • the method according to the invention includes at least the following steps:
  • the membrane 17 is prestretched before the concrete 33 is being poured, and in order to fix the membrane 17 to at least two opposite sides 4 and 5 of the formwork 1, a series of concrete support blocks 3 are provided in between which are provided steel pipes 3 or reinforcement bars 37 which hold the concrete support blocks 3 at a fixed distance from one another and which absorb the tension force for prestretching the membrane 17, as well as the additional tension force which is present as soon as the concrete 33 has been poured, until the concrete 33 has cured.
  • the invention is by no means restricted to the embodiments of a formwork 1, a construction 20 and a concrete slab 21 according to the invention, described by way of example and illustrated in the accompanying drawings; on the contrary, such formworks 1, constructions 20 and concrete slabs 21 can be achieved in many other ways while still remaining within the scope of the invention.
  • the invention is not restricted either to the examples of methods according to the invention for pouring a concrete slab, described by way of example; on the contrary, other methods can be applied as well while still remaining within the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

Cette invention concerne un coffrage (1) conçu pour couler une dalle de béton (21), ledit coffrage (1) comprenant une membrane (17) constituée d'une feuille ou d'un bâche ou analogue, en plastique, ladite membrane (17) formant la surface d'appui qui supporte le béton (33) à couler pour la dalle de béton (21) pendant qu'il durcit.
EP15730268.8A 2014-05-16 2015-05-15 Coffrage pour le coulage d'une dalle de béton, structure pour le coulage d'un plancher, d'un toit ou d'un plafond, procédé de coulage d'une dalle de béton, et dalle de béton Active EP3143219B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2014/0371A BE1021913B1 (nl) 2014-05-16 2014-05-16 Verloren bekisting voor het storten van een betonplaat, constructie voor het storten van een vloer, dak of plafond, werkwijze voor het storten van een betonplaat, evenals betonplaat
PCT/IB2015/053585 WO2015173775A1 (fr) 2014-05-16 2015-05-15 Coffrage pour le coulage d'une dalle de béton, structure pour le coulage d'un plancher, d'un toit ou d'un plafond, procédé de coulage d'une dalle de béton, et dalle de béton

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EP3143219A1 true EP3143219A1 (fr) 2017-03-22
EP3143219B1 EP3143219B1 (fr) 2022-01-05

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EP15730268.8A Active EP3143219B1 (fr) 2014-05-16 2015-05-15 Coffrage pour le coulage d'une dalle de béton, structure pour le coulage d'un plancher, d'un toit ou d'un plafond, procédé de coulage d'une dalle de béton, et dalle de béton

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EP (1) EP3143219B1 (fr)
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WO (1) WO2015173775A1 (fr)

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE1941662B2 (de) * 1968-10-14 1979-02-01 Vyskumnyustav Pozemnich Staveb, Prag Decke
US3619959A (en) * 1969-07-07 1971-11-16 Sidney A Parker Concrete building
FR2453955A1 (fr) * 1979-04-10 1980-11-07 Ing Coordination Const Element pour la construction de planchers
CA2101594A1 (fr) * 1992-09-18 1994-03-19 Mark W. West Methode de realisation d'un platelage en beton au moyen d'un coffrage souple

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015173775A1 *

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WO2015173775A1 (fr) 2015-11-19
EP3143219B1 (fr) 2022-01-05
BE1021913B1 (nl) 2016-01-26

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