EP2231947A1 - Element prefabrique pour la realisation d'une dalle en beton arme et dalle ainsi realisee - Google Patents
Element prefabrique pour la realisation d'une dalle en beton arme et dalle ainsi realiseeInfo
- Publication number
- EP2231947A1 EP2231947A1 EP08761900A EP08761900A EP2231947A1 EP 2231947 A1 EP2231947 A1 EP 2231947A1 EP 08761900 A EP08761900 A EP 08761900A EP 08761900 A EP08761900 A EP 08761900A EP 2231947 A1 EP2231947 A1 EP 2231947A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- beams
- concrete
- longitudinal
- slab
- transverse
- 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
Links
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 18
- 239000004567 concrete Substances 0.000 claims abstract description 113
- 239000002184 metal Substances 0.000 claims abstract description 69
- 230000002787 reinforcement Effects 0.000 claims abstract description 47
- 238000009415 formwork Methods 0.000 claims abstract description 21
- 230000000284 resting effect Effects 0.000 claims abstract description 14
- 238000005452 bending Methods 0.000 claims abstract description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 33
- 238000003466 welding Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 14
- 238000005304 joining Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 238000009417 prefabrication Methods 0.000 claims description 5
- 238000009416 shuttering Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 235000000396 iron Nutrition 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 229920001084 poly(chloroprene) Polymers 0.000 description 3
- 230000004224 protection Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 241001310793 Podium Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
Definitions
- the invention relates to a prefabricated element for the realization of a reinforced concrete slab and also covers a slab thus produced and its manufacturing process.
- slabs of reinforced concrete comprising a metal reinforcement embedded in the concrete, between two faces of facing, generally parallel.
- formwork panels are placed on which the reinforcement is placed and then the concrete is poured on the desired thickness.
- prefabricated beams spaced apart from each other between which are placed shuttering panels for the casting of the slab, the prefabricated beams being provided with connectors to be secured to the slab after the setting of the concrete .
- the dimensions of such prefabricated beams are limited by the possibilities of lifting and handling.
- Document FR-A-2 851 779 describes a prefabricated element of this type comprising at least two parallel metal beams each having a core, an upper flange and a lower flange embedded in a concrete slab.
- the webs of the two metal beams are connected at their lower part by hitching irons which extend laterally projecting from the concrete plate to ensure the transverse connection between the adjacent prefabricated elements.
- Document FR-A-2 851 779 aims to improve the transverse strength of the structures thus produced by means of the hitching irons which extend laterally projecting from the sole. In this way, it is possible to make the rails of a crossing structure.
- the bending resistance is provided by the metal beams, the concrete serving essentially as coating.
- the concrete plate connecting the lower flanges of the metal girders is subjected to stresses which risk cracking it, in particular during the transport and laying of the prefabricated element.
- the invention provides a solution to such problems thanks to a new type of prefabricated element that is both lightweight and strong, comprising a monolithic reinforcement cage capable of withstanding the bending forces in all directions by cooperating, in addition, perfectly with the concrete slab during the transport and laying of the element and, in use, with the concrete of the slab.
- the invention thus makes it possible to realize quickly, economically and safely reinforced concrete slabs possibly having spans. relatively large, may exceed 10 meters, with a relatively small thickness, of the order of 500 to 600 mm.
- the subject of the invention is therefore, in general, a prefabricated element for producing a reinforced concrete slab, of the type comprising at least two longitudinal metal beams each having at least one core, a lower flange and a flange. upper sole plate, a reinforced concrete plate in which the lower flanges of the metal beams are embedded, and means for transverse connection between the longitudinal beams, said concrete slab constituting, after the element has been laid on spaced apart supports, a formwork for casting a concrete layer in which the longitudinal beams are embedded so as to form the slab.
- the connecting means between the longitudinal beams consist of two transverse reinforcement plies extending respectively to the lower flanges and to the upper flanges of said beams and fixed rigidly thereto so as to forming with said beams a monolithic reinforcement assembly capable of withstanding the bending forces applied in the longitudinal and transverse directions cooperating with the concrete plate, during transport and laying of the element on its supports.
- the two reinforcing plies each comprise a plurality of spaced transverse bars, welded on the outer faces of the flanges, respectively upper and lower, longitudinal beams, and a plurality of longitudinal bars welded on said transverse bars.
- At least the outer faces of the flanges, respectively upper and lower longitudinal beams, are provided with protruding connectors so as to ensure the bonding of the beam with the concrete which enrobe.
- the vertical core of each metal beam has a perforated structure having concrete passage openings on either side of the beam through the vertical core.
- the concrete plate in which the lower parts of the beams are embedded has a width compatible with the possibilities of transport by road or rail.
- the concrete slab may be extended at right angles along at least one of its lateral sides by a portion raised so as to form a cornice having a height at least equal to the thickness of the slab. slab to achieve.
- the concrete slab can be extended at right angles along at least one of its transverse sides by a raised portion forming a cornice in which is embedded the corresponding end of each longitudinal beam.
- the invention thus makes it possible to produce a slab or a platform of any width resting on at least two spaced apart supports. But it is also possible to make several consecutive bays based on intermediate supports.
- each metal beam is extended beyond the corresponding transverse side of the plate, by a connecting portion extending in a console and can be secured to a corresponding part of the plate. a metal beam of a next element.
- the two reinforcing plies respectively form with the sole plates of the beams, the lower part and the upper part of at least one tubular reinforcement cage extending between two longitudinal beams substantially along their entire length and secured thereto by solder points made at least at the upper flanges and lower flanges.
- the invention also covers a method for producing a prefabricated element comprising the following steps:
- a prefabricated element comprising at least one longitudinal metal beam having a bottom flange and an armor ply sealed in a reinforced concrete plate capable of constituting a formwork for the pouring of a reinforced concrete slab by the monolithic reinforcement cage constituted by the beams secured by the two plies of reinforcement.
- Such prefabricated elements allow for a reinforced concrete slab resting on at least two spaced apart supports.
- at least one prefabricated element is placed on the supports and the lower concrete plate is surrounded by shuttering elements extending vertically over a height at least equal to the thickness of the slab to be produced, this being obtained by pouring concrete into the mold thus formed and whose plate constitutes the bottom, to a thickness sufficient to completely drown the reinforcement cage.
- the concrete slab is provided with a recess in which at least one connecting piece is provided at the desired location on the support for sealing the slab with the support. by pouring concrete into said recess.
- the slab consists of at least two prefabricated elements placed next to each other with at least two adjoining adjacent sides and two outer sides along which the concrete slab is provided with a raised portion constituting a formwork element for pouring concrete into the mold thus formed.
- the slab consists of at least two elements placed one after the other in the longitudinal direction with joining the adjacent ends of the metal beams.
- Figure 1 shows schematically in cross section the realization of a prefabricated element according to the invention.
- Figure 2 is a cross-sectional view of a slab formed from two elements placed side by side.
- Figure 3 shows a first example of use of prefabricated elements for the realization of a building.
- Figure 4 shows two variants of the junction between the plates.
- FIG. 5 schematically shows, in perspective, the production of a bridge plate by means of prefabricated elements according to the invention.
- FIG. 6 shows, in cross section, an example of a lower passage made by means of prefabricated elements according to the invention.
- Figure 7 is a partial view, in cross section, of the deck of such a lower passage.
- Figure 8 is a detail view, in section, of a recess.
- Figure 9 is a side view of a composite bridge deck resting on an intermediate support.
- FIG. 10 is a partial sectional view of the plate of FIG. 9.
- Figure 11 shows the connection between two consecutive elements at the intermediate support.
- FIG. 12 is a view from below along the line 1-1 of FIG. 1.
- FIG. 13 is a sectional view along the line II-II of FIG.
- Figure 14 is another example of junction between two consecutive plate elements with offset support.
- Figure 15 shows, in cross section, another embodiment of a prefabricated element according to the invention.
- Figure 16 shows, in cross section, another embodiment of a slab consisting of two elements according to Figure 15, placed side by side.
- FIG. 1 diagrammatically shows, in cross-section, a first embodiment of a prefabricated element 1 according to the invention comprising, in the example shown, three beams 2 made of I or H section metal sections. whose lower part is sealed in a plate 3 of reinforced concrete.
- the beams 2a, 2b, 2c are parallel to a longitudinal direction of the element 1, that is to say perpendicular to the plane of Figure 1 and each comprise a vertical core 20 and two flanges 21, 22, the lower sole 21 being embedded in the concrete plate 3.
- the three beams 2a, 2b, 2c are connected by two reinforcing plies, respectively an upper ply 4 and a lower ply 4 'embedded in the concrete plate 3.
- the upper sheet 4 consists, in a conventional manner, of a plurality of transverse bars 41 and longitudinal bars 42 spaced from each other and distributed, respectively, along the length and the width of the element.
- the transverse bars 41 are applied directly to the outer faces 23 of the upper flanges 22 of the three beams 2a, 2b, 2c and, in addition, are fixed thereto, by weld points 43 distributed over the entire width of the sole 22 or by a continuous weld seam. In this way, each transverse bar 41 is secured to the upper flanges 22 of the three beams 2a, 2b, 2c.
- the longitudinal bars 42 spaced from each other and distributed over the entire width of the element, are placed above the transverse bars 41 and fixed thereto by welding.
- the lower ply 4 ' consists of transverse bars 41' and longitudinal bars 42 ', the transverse bars 41' being applied and welded to the outer faces 23 'of the lower flanges 21 of the three beams 2a, 2b, 2c, the lower longitudinal bars 42 'being placed below the lower transverse bars 41' and fixed thereon by welding.
- the lower ply 4 ' is thus embedded with the flanges 21 in the concrete plate 3, the thickness of which must be sufficient for the longitudinal bars 42' fixed on the transverse bars 41 'and the lower flanges 21 to be at a distance minimum coating (b) of the underside of the plate 3.
- the characteristics of the metal reinforcement cage constituted by the beams (2) and the two reinforcing plies (4, 4 '), as well as the thickness (e) of the plate ( 3), are determined so that, after demolding, all of the element thus produced can be handled, transported and put in place on spaced apart supports and that, in addition, the plate 3 can withstand certain loads or shocks accidents and the weight of the concrete 1 1 which, as discussed below, is poured over the plate 3 including the beams 2 to form a slab D.
- the number of metal beams 2, their dimensions, their spacing I and the characteristics of the two reinforcing plies will be determined as a function of the loads to be borne by the slab D made by means of the element 1, as well as the possibilities handling and laying thereof, in particular lifting devices that are available at the construction site.
- the assembly constitutes a monolithic reinforcement cage, relatively rigid and dimensionally stable, able to withstand the stresses, in particular the bending forces applied in the longitudinal direction and in the transverse direction, cooperating with the concrete plate 3 during transport and installation of element 1 on its supports.
- each section of the reinforcement cage comprising two sections on which the transverse bars 41, 41 'are welded constitutes an indeformable rectangle and It is therefore unnecessary to provide connecting stirrups between the two reinforcing plies.
- a prefabricated element can, in fact, be made in a mold 10 having a bottom 101 preferably rectangular, two lateral sides 102 and two transverse sides 103.
- the reinforcement cage is first of all prefabricated by placing one next to the other, on a plane support, the metal beams 2a, 2b, 2c on which the transverse bars 41 are then placed. which are welded to the outer faces 23 'of the flanges 21, over the entire width thereof. Then the longitudinal bars 42 'are laid and welded on the cross bars 41'. Connectors 24 'are also fixed on the flanges 21. The assembly thus produced can then be turned over so as to allow the laying and welding of the transverse bars 41 on the flanges 22 equipped with connectors 24, then longitudinal bars 42.
- a metal reinforcement cage has thus been formed comprising three beams 2a, 2b, 2c whose soles are secured by the two reinforcing plies 4, 4 '.
- a minimum coating distance (b) relative to the bottom of the mold is maintained by unrepresented spacers.
- the mold is then filled with concrete 1 1 to a height (e) for example of the order of 10 to 20 cm, so as to completely embed the armature ply 4 ', the connectors 24' and the lower parts beams 2, giving the desired resistance to the plate 3.
- the prefabricated element 1 thus produced can be removed and transported to the construction site.
- the total width L of the element, between the lateral sides 30 of the plate 3 will be determined so as to respect the road traffic gauge.
- This width L may therefore be of the order of 2.5 m, the element 1 preferably comprising three beams 2 spaced apart by about 0.8 m.
- the length of the element can be much more important. For example, a length of 10 to 15 m still allows transport on a conventional road trailer.
- a prefabricated element thus produced can be particularly strong while remaining relatively flexible, given its length, while maintaining, however, a weight compatible with the lifting possibilities normally available on a site of some importance, by example for the realization of a bridge or a passage under.
- Such an element can therefore be handled and placed on supports spaced in the longitudinal direction, the elements being placed side by side in a number to cover the desired surface.
- FIG. 1 shows a standard element comprising a plurality of metal beams 2 rigidly connected by the two reinforcing plies 4, 4 ', the assembly being sealed at the base in a plate 3 which is extended laterally, Beyond the beams 2a, 2c, a free length (I / 2) preferably equal to half the gap between the beams 2.
- the transverse bars 41 of two adjacent elements 1, 1 ' can be extended beyond the junction plane P and associated with longitudinal bars 43 to ensure the joining of the two upper reinforcing plies. at the level of the plane P.
- short transverse bars 44 associated with longitudinal bars 43 ' can be placed on the upper faces of the plates 3, 3' between the webs 20c, 20'a of the two beams. longitudinal adjacent 2c, 2'a.
- the total height (h) of the D-slab may be less than that of a concrete slab.
- classical weapon comprising two reinforcing plies connected by stirrups.
- a raised portion 36 which preferably extends over the height (h) to give the slab and is a kind of cornice.
- a raised portion 36 which preferably extends over the height (h) to give the slab and is a kind of cornice.
- Figure 2 of a floor consisting of two elements placed side by side one of the lateral sides of each of the elements 1, 1 'is provided with a cornice 36, 36', the other two sides of the plates 3, 3 'joining along the longitudinal joint plane P, in which is interposed a seal 35. It is thus possible to make a slab more or less armed depending on the loads to bear.
- the elements can thus be prefabricated in the factory then transported to the construction site.
- such a technique makes it possible, for example, for a building or a parking lot, a floor 5 resting on walls or rows of spaced apart pillars 50.
- the transverse ends 51 of the slabs can be formed, either by a removable formwork or by a portion raised cornice.
- the adjacent sides 30, 30 'of the plates 3, 3' of two neighboring elements can be provided with thinned or recessed, recessed and projecting parts which fit into one another when the elements are laid, with the interposition of a seal 35.
- the use, as main reinforcements, of metal beams 2 cooperating with the reinforcing plies 4, 4 ', the concrete slab 3 and the concrete 1 1 of the slab D makes it possible to produce prefabricated elements of great length being able to rest, at their ends, on supports separated by a distance being able to exceed the 15 m.
- the platform 5 of the bridge which rests on two longitudinal beams 53 apart, consists of a plurality of prefabricated elements 1, 1 'each comprising several metal beams 2 whose base is sealed in a concrete plate 3.
- a single beam 2 has been shown for the prefabricated element 1b and the reinforcing bars 41, 42 are only partially indicated.
- the two main beams 53 on which the platform 5 of the bridge lies are separated by a distance L2 less than the length L1 of the element which thus comprises a central portion 3a extending between the two beams 53 and two parts 3b extending cantilevered.
- each element 1 is provided, at its two longitudinal ends, with raised portions 56 which, as previously, extend at right angles to the transverse sides 38 of the plate 3 and extend to above the level of the upper flanges. beams 2 so as to form transverse cornices 56 in which are included the ends 23 of the beams 2.
- housings 57 can be reserved in these transverse cornices 56 to facilitate the assembly of unrepresented railings.
- the elements 1 placed at the ends of the platform 5 are provided, as in the case of Figure 2, a raised portion 36 parallel to the beams 2 and forming a lateral formwork.
- These lateral raised portions 36 and transverse 56 form a self-formwork for pouring concrete 1 1 to embed the beams 2 and thus form the platform of the bridge.
- the concrete plate 3 is provided, at the level of the main beams 53 on which the platform 5 rests, recesses 37 which pass through the plate 3 over its entire height and are placed between two parallel longitudinal beams 2.
- the corresponding zones of the main beams 53 are then provided with connectors 54 welded to the upper flange 55 of the beam 53 and which engage in the recesses 37 at the laying of the prefabricated element 1 which can thus be sealed to the main beams 53 by casting concrete in the recesses 37.
- the platform 5 thus produced could be based, if necessary, on more than two main beams 53.
- the realization of such a bridge is easier and safer than by the old methods.
- the plate 3 being relatively thick and armed, during the prefabrication of each element, by the lower sheet 4 'welded to the soles 21, it is no longer necessary to provide a fall protection for setting up and sealing the elements. These can only be fitted with temporary guardrails attached to the upper flange of the metal beams 2.
- FIGS. 6 and 7 show the production of a lower passage by means of prefabricated elements according to the invention.
- a lower passage comprises, for example, a platform 6 resting on two spaced apart abutments 61 which may advantageously consist of juxtaposed prefabricated elements, each comprising a vertical wall forming a cross-piece 61 and provided at its base with an enlarged sole 62 enabling this pedestrian element is simply placed on the bottom of a trench T.
- each pedestal element 61 is provided at its upper part with an enlarged part 63 on which the platform 6 which can be constituted, as shown in Figure 7 of a plurality of prefabricated elements in the manner shown in Figure 1 and each comprising a concrete plate 3 in which are sealed the lower flanges of two or three metal beams 2.
- the distance between L3 support may be of the order of 15 m, the l very metallic 2 being dimensioned accordingly to present the inertia necessary for the recovery of the own weight of the elements and loads applied.
- the assembly may be covered with an embankment R for the passage of a transverse lane.
- the number of elements 1 constituting the platform 6 is determined as a function of the width of the passage to be made, the plates 3 of the elements being provided, on their lateral sides 30, with conjugate parts engaging one inside the other of way to avoid the risks of strumming.
- the elements 1 placed on the sides of the platform 6 thus produced are provided with raised portions 36 forming self-formwork for the realization of the slab D by pouring concrete 1 1 until- above the level of the upper flanges 22 of the beams 2 which are thus completely embedded in the concrete 1 1.
- the elements 1 forming such a platform 6 can simply be placed, at their ends, on the two abutments 61, by means of conventional supports, for example neoprene or roller supports for dilations.
- Figure 8 is a detail view showing, by way of example, such a recess.
- the platform 6 consists of a number of elements 1 placed side by side and each comprising a concrete plate 3 in which are sealed the lower flanges 21 of several metal beams 2.
- each metal beam 2 is extended beyond the transverse edge 38 of the plate 3, by a part 23 extending over a free length d and coming to rest, via a metal grain 24, on a plate 25 sealed on the upper face 64 of the right-hand side 61.
- a seal 26 is placed along the transverse edge 38 of the plate 3 which is located substantially at the inner edge of the upper portion 63 of the pawl 61.
- the platform 6 and recessed at its ends in the piers 61 can have a very large L3 range, up to 15 m, for a relatively small height h, of the order of 500 to 600 mm, for example.
- the prefabricated elements according to the invention can be light enough to be handled by medium power lifting equipment and the use, as longitudinal reinforcements, of metal profiles cooperating with the concrete slab D makes it possible to reduce thickness of it.
- the method according to the invention is therefore particularly suitable, for example, for the coverage of an urban motorway, often made in trench, because it allows to put in a few hours, in the middle of the night, a number of prefabricated elements. placed side by side, the concrete plates 3, armed by the lower plies 4 'welded to the flanges 21 of the beams 2, being strong enough to safely achieve the casting of the concrete 1 1 forming the slab, even after the recovery of the circulation.
- the invention is also particularly advantageous for the realization of mixed bridges with several spans.
- FIG. 9 shows, by way of example, a bridge comprising such a platform 6 of great length resting on an intermediate stack 7 and, at its ends, on abutments 61.
- the platform 6 shown, in partial section, in FIG. 10, consists of a number of prefabricated elements 1 comprising, according to the invention, metal beams 2 having a bottom soleplate 21 sealed in a plate. concrete 3 with a lower reinforcing ply 4 '.
- the lateral elements 1a comprise a raised portion 36 which forms a self-formwork for pouring the concrete 1 1 embedding all the reinforcements to form the slab D.
- this slab D is covered with a wearing course 15 and may comprise, on each side, a sidewalk 16 and a railing 17.
- the prefabricated elements 1 forming the platform 6 can have a large range, for example from 10 to 15 m, and bear at one end on the abutment 61 and at the other end on the intermediate stack 7 ( Figure 1 1).
- the end of the platform 6 resting on the abutment 61 forms a recess 60 made in the manner described above with reference to Figure 8, such an installation to limit the height of the beams 2 necessary to withstand the applied loads.
- Figures 1 1 to 13 show the realization of the intermediate support on the stack 7, before casting the concrete constituting the slab.
- FIG. 11 shows, in elevation, the junction between two consecutive elements 1, 1 'extending on either side of a transverse joint plane Q, at the level of the intermediate support 7, FIG. cross-section in the joint plane Q.
- Each prefabricated element 1, 1 ' comprises, as in the case of FIG. 1, three metal girders 2 having a bottom flange 21 and a reinforcing ply 4' sealed in the concrete slab 3 constituting the basis of the element.
- the beams 2 are extended by a portion 23 beyond the transverse edge 38 of the plate 3 which is stopped at a distance (d) from the joint plane Q while the beams 2 extend substantially until joint plane, the ends 23, 23 'cantilever parts of the beams being separated only by a small gap (i).
- the corresponding beams 2, 2 'of two consecutive elements 1, 1' which are placed in the extension of one another, are joined together by a splice 8 comprising vertical plates 81 bolted on the webs 20, 20 'of the two beams 2, 2' and sets of horizontal plates 82, 83 bolted on the two faces, respectively inner and outer of the flanges, respectively bottom 21, and upper 22 of the two beams 2, 2 '.
- a lower formwork panel 75 is put in place to form the bottom of the space left free between the ends 38, 38 'of the concrete plates 3, 3 'of the two elements 1, 1'.
- each space between two consecutive elements 1, 1 ' can be closed by a panel 75 in two parts provided with notches for the passage of the bearing grains 73 of the three pairs of beams 2, 2', the entire panel being sealingly attached to the transverse edges 38, 38 'of the two plates 3, 3' and to the grains 73 so as to form a formwork allowing the casting of self-placing concrete on the plates 3, 3 'of the consecutive elements to form the platform 6 by embedding all of the metal beams joined together and the two upper layers 4 which can be connected by longitudinal connecting bars 45.
- the metal beams 2 could have another profile, for example with a perforated core or lattice.
- the width (L) of the elements 1 may vary, as well as the number of beams 2 per element and their spacing, the constitution of the secondary reinforcement 4 and the distribution of the longitudinal and transverse irons 13 and 12 being adapted accordingly. .
- the prefabricated elements 1 will normally have a rectangular shape, with two lateral sides 30 parallel to the beams 2 but other forms can be envisaged. For example, some elements could have convergent lateral sides in order to make a bridge platform at an angle or in a curve.
- FIG. 15 shows, by way of example, in cross-section, another embodiment of such a prefabricated element comprising three longitudinal sections 2a, 2b, 2c with an I-section, the lower flanges 21 of which are embedded in a plate made of Concrete 3.
- this concrete slab can be reinforced with a welded mesh 31 passing below the flanges 21 of the beams 2 and whose ends 31 'can be folded to arm the lateral sides 30 of the plate 3 but this lattice 31 would be insufficient to avoid, during demolding and handling of the element , the risk of cracking of the concrete plate 3 by the soles 21 embedded in it, in case of overturning, even small, metal beams 2.
- this risk is avoided by rigidly connecting the lower flanges 21 and upper 22 of the beams by two reinforcing plies so as to produce a relatively undeformable monolithic reinforcement cage.
- this securing of the metal beams is obtained by means of tubular cages 40a, 40b constituted by longitudinal bars 42 connected by rings 46 whose lower part and the upper part are placed respectively at the level of the soles. lower 21 and lower flanges 22 and welded thereon by welding points 47, 47 ', the rings 46 being also welded to the webs 20 of the beams 2 by welding points 48.
- Each hoop 46 of a tubular cage 40 is thus connected to each of the profiles 2 which surround it, by three separated welding points 47, 48, 47 'and thus constitutes a non-deformable rectangular assembly opposing the overturning of the sections 2a, 2b.
- a slab D of any width can be made by placing side by side a number of prefabricated element 1 having a width of 2 m to 2.5m.
- FIG. 16 shows a slab having a width of approximately 5 m consisting of two elements 1, 1 'placed side by side on either side of a junction plane P.
- the concrete plates 3, 3 ' are provided, on the side opposite the plane P, cornices 36 allowing casting of the concrete 1 1 to form the slab D, a seal 35 being placed between their adjacent sides.
- An intermediate tubular cage 40c is placed between the end beams 2c, 2'c of the two adjacent elements 1, 1 '.
- This intermediate cage 40c consists, like the cages 40, of a number of longitudinal bars 42 connected by rings 46 but its thickness is reduced so as to rest on the upper face 32 'of the two adjoining plates 3, 3' by ensuring the joining of the two parts of the slab D.
- transverse threads (12) are put in place, before casting the concrete (1 1) so as to extend across the width of the platform through the souls 20 of the beams 2 by orifices previously drilled in the factory for this purpose.
- these cornices can be reinforced by a suitable reinforcement not shown, so as to form side beams 36, 36 ', with, optionally, armatures waiting which provide the connection with the transverse threads 12.
- the beams 2 which constitute, in the longitudinal direction, the main reinforcement of the slab D, may be supplemented by longitudinal threads 13 added to the reinforcement cages 4.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Bridges Or Land Bridges (AREA)
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2008/050023 WO2009087321A1 (fr) | 2008-01-07 | 2008-01-07 | Element prefabrique pour la realisation d'une dalle en beton arme et dalle ainsi realisee |
Publications (2)
Publication Number | Publication Date |
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EP2231947A1 true EP2231947A1 (fr) | 2010-09-29 |
EP2231947B1 EP2231947B1 (fr) | 2011-09-28 |
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Application Number | Title | Priority Date | Filing Date |
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EP08761900A Active EP2231947B1 (fr) | 2008-01-07 | 2008-01-07 | Element prefabrique pour la realisation d'une dalle en beton arme et dalle ainsi realisee |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2231947B1 (fr) |
AT (1) | ATE526465T1 (fr) |
WO (1) | WO2009087321A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102061791A (zh) * | 2010-08-12 | 2011-05-18 | 周嘉陵 | 复合装饰混凝土及工法 |
CN107849854A (zh) * | 2015-05-21 | 2018-03-27 | 利夫廷波因特Pre-Form私人有限公司 | 用于结构的模块 |
DE102018212750A1 (de) | 2018-07-31 | 2020-02-06 | Pfeifer Holding Gmbh & Co. Kg | Tragbalken für Deckensysteme, Deckensystem und Verfahren zu deren Herstellung |
Family Cites Families (4)
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FR2537631B1 (fr) * | 1982-12-14 | 1985-06-21 | Biep Fougerolle Cie | Perfectionnements aux structures en beton precontraint |
DE19712105A1 (de) * | 1997-02-24 | 1998-09-03 | D & W Stahl Und Anlagenbau Gmb | Verbundbaudecke für Hochbauten |
JP4048007B2 (ja) * | 1999-09-13 | 2008-02-13 | 新日本製鐵株式会社 | 合成床版の継手部構造 |
FR2851779B1 (fr) * | 2003-02-27 | 2006-05-19 | Conseil Service Investissement | Element prefabrique de construction |
-
2008
- 2008-01-07 EP EP08761900A patent/EP2231947B1/fr active Active
- 2008-01-07 WO PCT/FR2008/050023 patent/WO2009087321A1/fr active Application Filing
- 2008-01-07 AT AT08761900T patent/ATE526465T1/de not_active IP Right Cessation
Non-Patent Citations (1)
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See references of WO2009087321A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2231947B1 (fr) | 2011-09-28 |
WO2009087321A1 (fr) | 2009-07-16 |
ATE526465T1 (de) | 2011-10-15 |
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