EP1678389A1 - Large-span self-supporting metal formwork - Google Patents
Large-span self-supporting metal formworkInfo
- Publication number
- EP1678389A1 EP1678389A1 EP04817218A EP04817218A EP1678389A1 EP 1678389 A1 EP1678389 A1 EP 1678389A1 EP 04817218 A EP04817218 A EP 04817218A EP 04817218 A EP04817218 A EP 04817218A EP 1678389 A1 EP1678389 A1 EP 1678389A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lateral
- profiled panel
- central area
- panel according
- profiled
- 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
- 238000009415 formwork Methods 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 title description 5
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 239000003351 stiffener Substances 0.000 claims description 24
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 239000008397 galvanized steel Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 230000002787 reinforcement Effects 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
- E04B5/40—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 with metal form-slabs
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/0473—U- or C-shaped
Definitions
- the present invention relates to a profiled panel for long-span formwork intended, in particular, for the manufacture of concrete slabs.
- floors are produced in the form of concrete slabs, by pouring concrete onto a formwork made up of an assembly of metal panels, the ends of which rest on transverse beams by means of connecting pieces.
- the panels constitute a circulation and work platform for the personnel who intervene on the site.
- metal panels remain in place and serve as additional reinforcement for the concrete slab.
- Such formwork is called "self-supporting formwork”.
- metal profiled panels of omega-shaped section comprising a ribbed upper central area framed by two inclined webs each extended by a ribbed lower horizontal flange.
- Each core has two longitudinal folds, one arranged near the central beach and the other near the bottom flange, intended to increase rigidity.
- the ribs of the upper central area are arranged near the edges of the latter and the ribs of the lower soles are arranged at mid-width of the soles. Due to their mechanical performance, such panels have the drawback of not allowing a span of around 5.50 m to be exceeded. In addition, the mechanical resistance of the floors obtained and the protection of the framework against fire are not always optimal.
- the object of the present invention is to remedy these drawbacks by proposing an optimized profiled panel so as, in particular, to be able to reach a range of up to 6m, and easy to achieve by profiling.
- the subject of the invention is a profiled panel for long-span formwork having an omega-type profile, the profiled panel comprising:
- the profiled panel is such that at least one longitudinal stiffening ply of each lateral core is placed in the part of the lateral core intended to work in compression when the profiled panel is placed on a structure and covered with concrete, and the part intended for working in traction does not have a longitudinal stiffening fold.
- the part of a lateral core intended to work in compression is, in general, included in the upper half of the lateral core adjacent to the upper central area, and the part of the lateral core intended to work in traction comprises at least the lower half of the lateral core adjacent to a lower sole.
- At least one lateral core may include a vertical notch disposed between the at least one stiffening ply and the corresponding lower sole.
- at least one lower sole has on its external lateral edge an edge stiffener constituted for example by a raised edge.
- the bottom of at least one sole is flat and does not have an intermediate stiffener.
- the angle ⁇ formed by a lateral wing with a plane parallel to the upper central range is between 74.8 ° and 79.8 °.
- the width P e of the side strip of the upper central area extending between the lateral edge of the upper central area and the edge of the longitudinal rib disposed on the side of said lateral edge of the upper central area is greater than 8% of the width l pc of the upper central area, and the width l c of the notched area of the upper central area is preferably greater than 60% and better still 75% of the width l pc of said central area.
- the length of the profiled panel can be more than 5.7 m.
- the profiled panel is for example of steel and preferably of galvanized steel, and can be manufactured by profiling and its thickness is preferably between 0.9 mm and 1.5 mm.
- the profiled panel thus produced has the advantage of making it possible to increase the payload and to increase the range of the formwork, while facilitating the profiling operation, in particular by simplifying the necessary profiling tool.
- the profiled panel is particularly suitable for the production of floor slabs for car parks, industrial buildings, sales stores, storage stores, or any other similar building.
- the invention also relates to a floor comprising a concrete slab poured onto a self-supporting formwork consisting of adjacent profiled panels according to the invention, assembled by stitching, supported by transverse beams.
- FIG. 1 is a schematic view of the transverse profile of a profiled panel
- FIG. 2 is a partial representation of a self-supporting formwork.
- a profiled panel for formwork according to the invention of generally rectangular shape, has a transverse profile of the omega type as shown in Figure 1. Because of this omega profile, the profiled panel has, on its longitudinal central part, an upper central area 1 extending in the direction of the length. This upper central region 1 has two longitudinal ribs 4 and 4 ′ separated by a notch 5. These longitudinal ribs 4, 4 ′, as well as the notch 5, are intended to give the upper central region 1, sufficient rigidity so that, when the panel is placed on beams during the manufacture of a floor, the surface formed by the upper central area 1 can serve as a working surface and a circulation surface for workers working on the site.
- the central area 1 is extended on either side, along its lateral edges, by two cores 2 and 2 ′, inclined, extending towards the bottom of the panel and towards the outside of the panel, so as to form a trapezoid flared down (relative to the orientation of the figure which corresponds to the orientation of the panel when it is used).
- the lateral webs 2 and 2 'each have a longitudinal stiffener 6 and 6' extending over the entire length of the panel. Each stiffener 6 or 6 'consists of two folds which form a slight recess in the lateral core.
- Each lateral core 2 and 2 ′ extend in its lower part by a sole 3 or 3 ′, horizontal, extending towards the outside of the panel.
- each of the soles are extended by flanges 9 or 9 'raised upwards. These edges 9 or 9 'raised upwards serve as stiffeners.
- a panel 11 When such a panel 11 is used in a self-supporting formwork as shown in Figure 2, it is supported by means of levers 12 on two beams 10 parallel to each other, spaced a length close to the length of the panel.
- levers 12 When such a panel 11 is used in a self-supporting formwork as shown in Figure 2, it is supported by means of levers 12 on two beams 10 parallel to each other, spaced a length close to the length of the panel.
- Several panels 11 are thus arranged adjacent to each other, and the lateral flanges (not visible in the figure) of two adjacent panels are fitted one into the other and secured by stitching.
- This assembly constitutes a continuous formwork onto which concrete is poured so as to form a slab which extends over the surface of the formwork.
- the panels 11 undergo bending forces such that the upper parts 13 of the lateral cores are subjected to compressive stresses, and the lower parts 14 of the lateral cores are subjected to tensile stresses, especially in the longitudinal direction.
- the relative importance of the zones subjected to traction and the zones subjected to compression depends on different geometric parameters such as the height of the cores, the thickness of the concrete layer, the length and the width of the panels. A person skilled in the art knows how to determine from these parameters what is the importance of the zones subjected to traction and the importance of zones subjected to compression.
- the profiled panels according to the invention comprise cores 2, 2 'of which only the part intended to work in compression comprises a longitudinal stiffener 6, 6', and of which the part intended to work in traction, does not comprise any longitudinal stiffener and therefore is planar at least in the transverse direction.
- Each core 2 or 2 ′ therefore has in its upper part a flat upper range 7 or 7 ′, of width a s and, in its lower part, a lower range 8 or 8 ′ flat at least in the transverse direction.
- the upper areas 7 or 7 ' are separated from the lower areas 8 or 8' by the stiffeners 6 or 6 ', of width U ra .
- the lower area 8, 8 ′ plane in the transverse direction is not necessarily plane in the longitudinal direction.
- vertical notching is meant a notching consisting of notches each extending in the direction of the height of the core.
- the zone intended to work in compression represents at most half the height of the core, and the part intended to work in traction represents at least half the height of the core.
- the width a s of the upper range 7 or 7 'of the core is preferably less than half the width of the core, and the width of the lower range 8 or 8' of the core is more than half the width of the web.
- the souls thus produced have improved fire resistance.
- the inventors have also found that by properly choosing the angle ⁇ formed by a core with a horizontal plane parallel to the plane of the panel, that is to say at the plane of the upper central area, it was possible to optimize the weight of the sheet and the weight of the concrete, and ultimately optimize the useful capacity of a floor element. In particular to obtain satisfactory results, the angle ⁇ must be between 60 ° and 80 °. If the angle is too small, although the weight of the sheet is reduced, the weight of the concrete is significantly increased and the span is reduced.
- the calculation codes are provided for angles greater than 60% and the use of smaller angles requires obtaining prior agreements. If the angle is greater than 80 °, it is no longer possible to stack and unstack the panels easily. But more specifically, the inventors have found that the range was optimized for an angle ⁇ between 74.8 ° and 79.8 °.
- the flanges 3 and 3 ′ of the profiled panel are flat and do not have central longitudinal stiffeners. However, each sole 3 or 3 ′ has on its external lateral edge, an edge stiffener. This edge stiffener consists of a raised edge 9, 9 '.
- the inventors have in fact found that by not providing a stiffener in the axial part of the sole, but by providing an edge stiffener, the mechanical behavior of the panel is improved, and the implementation is facilitated, in particular by making the junctions between two more watertight adjacent panels, which is useful when pouring concrete, while achieving a profile that is easier to produce by profiling.
- the width P e of the part 21 or 21 ′ of the upper central area 1 located between the edge of the upper central area 1 and the edge of a longitudinal rib 4 or 4 ′ may be greater than or equal to 8% of the width l pc of the upper central area 1.
- the width l c of the notched area 5 of the upper area 1 can have a width greater than or equal to 60% or better 75% of the width l pc of the area superior central 1.
- the profile of the profiled panel can also be optimized in order to facilitate the assembly of two adjacent panels.
- the height h of a lateral core 2 may be slightly less than the height h 'of the other lateral core 2', the difference in height being equal to the thickness of the sheet of which the profiled panel is made up.
- the width s m of the lateral sole 3 corresponding to the first lateral core 2 may be slightly less than the width s m 'of the lateral sole 3' corresponding to the other lateral core so that, when two panels are arranged adjacent to each other, the lateral sole of one of the panels can fit perfectly into the lateral sole of the adjacent panel.
- the two upper central areas of the two panels are at the same height.
- the profiled panel has a useful width which is generally between 650 mm and 800 mm, a height h of between 200mm and 220 mm, and it can have a length which can exceed 5.7 m and even reach 6.2 m, from so as to allow formwork having a span of approximately 6 m.
- the useful width corresponds to the module or to the pitch of the self-supporting formwork and corresponds to the distance I separating the axes of two adjacent panels or, which amounts to the same thing, the axes of the two lower flanges of the same panel.
- the panel is made of galvanized steel and manufactured by profiling a sheet of thickness between 0.9 mm and 1.5 mm. The thickness must be greater than 0.9 mm to ensure sufficient rigidity.
- the thickness should preferably remain less than 1.5 mm in order to limit the weight of the panels. Indeed, it must be able to be manipulated manually to be implemented, in particular, in multi-storey buildings.
- the dimensions of the longitudinal stiffeners 4, 4 ′ of the upper central area 1 are preferably such that the opening U sp is between 25 and 45 mm, the width of the bottom U ⁇ p is between 0 and 15 mm, and the height H rp is between 10 and 25 mm.
- the dimensions of the longitudinal stiffeners 6, 6 'of the webs 2, 2' are such that the width U ra is between 20 and 40 mm, and the height H ra is between 15 and 25 mm.
- the width of the stiffener of the sole edge b is between 15 and 25 mm.
- the stiffeners are arranged in such a way that the distance P e between the edge of a longitudinal stiffener 4 or 4 'of the upper central area 1 and the edge of said upper area 1 is between 40 and 60 mm, the distance Pj between the edge of the same stiffener 4 or 4 ′ and the start of the notched range 5 is between 40 and 60 mm.
- the distance a s which separates the upper edge of the lateral core 2 or 2 'and the longitudinal stiffener 6 or 6' of the lateral core is preferably between 40 and 80 mm.
Landscapes
- 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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0312000A FR2860814B1 (en) | 2003-10-14 | 2003-10-14 | HIGH-RANGE AUTOMOTIVE METAL FORMWORK |
PCT/FR2004/002587 WO2005038159A1 (en) | 2003-10-14 | 2004-10-12 | Large-span self-supporting metal formwork |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1678389A1 true EP1678389A1 (en) | 2006-07-12 |
EP1678389B1 EP1678389B1 (en) | 2016-06-08 |
Family
ID=34355466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04817218.3A Active EP1678389B1 (en) | 2003-10-14 | 2004-10-12 | Large-span self-supporting metal formwork |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1678389B1 (en) |
ES (1) | ES2588928T3 (en) |
FR (1) | FR2860814B1 (en) |
PL (1) | PL1678389T3 (en) |
WO (1) | WO2005038159A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013019497B4 (en) * | 2013-11-21 | 2020-08-06 | Kingspan GmbH | Roof or ceiling slab designed as a concrete-steel composite construction |
DE102017214271A1 (en) * | 2017-08-16 | 2019-02-21 | Thyssenkrupp Ag | Steel trapezoidal profile and its use |
JP2021509700A (en) * | 2018-01-02 | 2021-04-01 | パトコ リミテッド ライアビリティ カンパニーPatco, Llc | Metal deck material |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1236603A (en) * | 1959-06-11 | 1960-07-22 | Acieroid | floor element and its applications |
US3653171A (en) * | 1969-06-18 | 1972-04-04 | Bethlehem Steel Corp | Spiral wire fastener for sheets of material |
US4453364A (en) * | 1980-05-27 | 1984-06-12 | Ting Raymond M L | Corrugated steel decking section |
US4630414A (en) * | 1980-09-17 | 1986-12-23 | Ting Raymond M L | Cellular steel decking |
US4741134A (en) * | 1984-07-02 | 1988-05-03 | Consolidated Systems, Inc. | Composite metal/concrete bar joist floor and method |
GB8628436D0 (en) * | 1986-11-27 | 1986-12-31 | Quikspan Construction Ltd | Structural member |
US5056348A (en) * | 1989-06-01 | 1991-10-15 | Robertson-Ceco Corporation | Method of making a profiled sheet metal building unit |
DE4215686C1 (en) * | 1992-05-14 | 1993-11-11 | Hoesch Siegerlandwerke Gmbh | Connection for steel trapezoidal profiles with under construction - is used for roof or ceiling plates formed as concrete-steel union constructions |
DE4414410C2 (en) * | 1994-04-26 | 1996-06-13 | Krupp Ag Hoesch Krupp | Connection of trapezoidal steel profiles to a substructure in a roof or ceiling slab designed as a concrete-steel composite construction |
-
2003
- 2003-10-14 FR FR0312000A patent/FR2860814B1/en not_active Expired - Lifetime
-
2004
- 2004-10-12 PL PL04817218.3T patent/PL1678389T3/en unknown
- 2004-10-12 WO PCT/FR2004/002587 patent/WO2005038159A1/en active Application Filing
- 2004-10-12 ES ES04817218.3T patent/ES2588928T3/en active Active
- 2004-10-12 EP EP04817218.3A patent/EP1678389B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2005038159A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2588928T3 (en) | 2016-11-07 |
EP1678389B1 (en) | 2016-06-08 |
FR2860814B1 (en) | 2006-02-24 |
FR2860814A1 (en) | 2005-04-15 |
PL1678389T3 (en) | 2016-12-30 |
WO2005038159A1 (en) | 2005-04-28 |
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