EP4155476A1 - Coffrage d'eclaircissement pour objets en beton arme et structure d'eclaircissement modulaire utilisant ces coffrages - Google Patents

Coffrage d'eclaircissement pour objets en beton arme et structure d'eclaircissement modulaire utilisant ces coffrages Download PDF

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Publication number
EP4155476A1
EP4155476A1 EP22197156.7A EP22197156A EP4155476A1 EP 4155476 A1 EP4155476 A1 EP 4155476A1 EP 22197156 A EP22197156 A EP 22197156A EP 4155476 A1 EP4155476 A1 EP 4155476A1
Authority
EP
European Patent Office
Prior art keywords
lightening
metal
cup
formwork
wedge member
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.)
Pending
Application number
EP22197156.7A
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German (de)
English (en)
Inventor
Gianfranco Gramola
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.)
Poseidon Gt Srl
Original Assignee
Poseidon Gt Srl
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Filing date
Publication date
Application filed by Poseidon Gt Srl filed Critical Poseidon Gt Srl
Publication of EP4155476A1 publication Critical patent/EP4155476A1/fr
Pending legal-status Critical Current

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    • 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
    • E04B5/326—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements
    • E04B5/328—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements the filling elements being spherical

Definitions

  • the present invention relates to a lightening formwork for reinforced-concrete objects and a modular lightening structure for reinforced-concrete objects using such formworks.
  • the present invention relates to a modular lightening formwork and a modular lightening structure to be incorporated into reinforced-concrete slabs in order to lighten the resulting object.
  • the reinforced-concrete slabs were realised by strategically inserting, between the reinforcement metal bars/rebars, large blocks of expanded polystyrene which were permanently embedded within the reinforced-concrete object, and made it possible to reduce the amount of concrete used per unit volume, with the resulting significant reduction of the overall weight of the object.
  • the most sophisticated lightening formworks currently on the market consist of two large cup-shaped bodies having substantially the shape of a spherical-cap, which are made of plastic material and are mutually coupled along the perimeter edge so as to form a spheroid-shaped rigid closed shell with the two flattened polar zones.
  • Patent EP2516763 B1 discloses a spheroidal-shaped lightening formwork that has, in at least one of the two polar zones, a pair of large clamping clips, which jut out cantilevered from the cup-shaped body and are structured to clamp onto as many reinforcement metal rebars/bars, so that the lightening formwork is firmly clamped onto the reinforcement before and during concrete casting.
  • clamping clips thus made require a perfect alignment between the lightening formwork and the reinforcement metal rebars/bars, thus the arrangement of the formworks along the metal reinforcement is rather hard-working, with the costs that this entails.
  • Aim of the present invention is to realise a modular lightening formwork, which is free from the drawbacks described above and is also cheap to produce.
  • a lightening formwork for reinforced-concrete objects as defined in Claim 1 and preferably, though not necessarily, in any one of the claims depending on it.
  • number 1 denotes, as a whole, a lightening formwork for reinforced-concrete objects, which is specifically structured to be permanently embedded within a slab or other reinforced-concrete object, so as to reduce the amount of concrete per unit volume.
  • the formwork 1 is specifically structured to be incorporated into a modular lightening structure 100 for reinforced-concrete objects, which is adapted to be permanently embedded within a reinforced-concrete slab or other object.
  • the modular lightening structure 100 comprises a metal framework 101 substantially rigid and at least partially made up of rectilinear metal bars rigidly fixed to each other; and one or more lightening formworks 1 that are fixed/attached to certain metal bars of the metal framework 101.
  • the metal framework 101 is preferably oblong in shape, and the lightening formworks 1 are fixed on the metal framework 101 one spaced beside the other, so as to form a row of formworks preferably extending without interruption substantially along the entire length of the metal framework 101.
  • the metal framework 101 has a nominal length preferably ranging between 1,5 and 6 metres, and is provided with at least one pair of substantially rigid and straight, metal support bars that are rigidly connected to each other and extend alongside and substantially parallel to one another, preferably while remaining locally substantially parallel to the framework longitudinal axis L and preferably substantially along the entire length of the metal framework 101.
  • the lightening formworks 1 are structured so as to be forcedly wedged/fitted between said pair of metal support bars, so as to realise a mechanical interference fit.
  • the lightening formworks 1 are adapted to be forcedly fitted into the slit between the two metal support bars of the metal framework 101, and are preferably structured so as to plastically deform against said metal bars when attempting to spread/move the metal bars apart/away from each other or vice versa.
  • both support metal bars preferably have a substantially circular cross-section, with a nominal diameter preferably ranging between 5 and 30 mm (millimetres).
  • the two metal support bars are preferably reinforced-concrete rebars.
  • the nominal distance d between the two metal support bars of the metal framework 101 moroever ranges between 50 and 300 mm (millimetres).
  • the metal framework 101 preferably has a cage-like or lattice-like structure and the lightening formworks 1 are preferably arranged, or better housed/enclosed/contained, within the same metal framework 101.
  • the metal framework 101 preferably comprises: a bundle of longitudinal metal bars 102 preferably having an approximately circular cross-section, which extend one spaced beside the other, parallel to the framework longitudinal axis L, and are arranged approximately at the vertices of a rectangle, trapezium or other polygon; and a series of transversal stiffening brackets 103, that are distributed along the entire length of the bundle of longitudinal metal bars 102 and connect the longitudinal metal bars 102 rigidly to each other.
  • each transversal bracket 103 furthermore consists of a small straight metal bar preferably with a substantially circular cross-section, which is bent so as to substantially copy the shape/perimeter of said polygon, is fitted on the bundle of metal bars 102 so as to cross and overlap the various longitudinal metal bars 102, and is finally firmly fixed to the various longitudinal metal bars 102 of the bundle preferably by welding.
  • the lightening formworks 1 are adapted to forcedly interlocked/wedged between the two longitudinal metal bars 102 of the metal framework 101 that are located at the ends/ vertices of a same side of the rectangle, trapezium or other polygon.
  • the two metal support bars are a pair of longitudinal metal bars 102 of the metal framework 101.
  • the metal framework 101 is preferably provided with at least four longitudinal metal bars 102 which have a substantially circular cross-section, with a nominal diameter preferably ranging between 6 and 20 mm (millimetres), extend parallel to the framework longitudinal axis L and are arranged approximately at the vertices of a substantially isosceles trapezium.
  • the longitudinal metal bars 102 of the metal framework 101 are preferably corrugated rebars.
  • the distance d between the longitudinal metal bars 102 that are arranged at the vertices of the smaller base of the trapezoid moreover ranges between 80 and 120 mm (millimetres).
  • Each transversal bracket 103 preferably consists of a small straight metal bar which has a substantially circular cross-section, with a nominal diameter preferably between 6 and 20 mm (millimetres), is substantially horseshoe- or U- bent so as to intersect the four longitudinal metal bars 102 in succession, and is firmly fixed to the four longitudinal metal bars 102 by welding.
  • each transversal bracket 103 of the metal framework 101 preferably consists of a substantially horseshoe- or U- bent, corrugated rebar.
  • the lightening formworks are preferably wedged/stuck in a rigid and stable, though easily removable manner, between the two longitudinal metal bars 102 of the metal framework 101 that are arranged at the ends/vertices of the smaller base of the trapezium.
  • each lightening formwork comprises two large cup-shaped bodies 2, 3 substantially complementary in shape, separate and distinct from each other, which are adapted to be firmly coupled to each other along the perimeter edge of the respective mouth, so as to form a substantially globoidal-shaped, rigid closed shell 4.
  • each cup-shaped body 2, 3 moreover has a single-piece structure.
  • cup-shaped bodies 2 and 3 are two substantially bowl-shaped, complementary half-shells that are selectively coupled to each other along their perimeter edge so as to form the globoidal-shaped rigid shell 4.
  • cup-shaped bodies 2 and 3 are preferably made of plastic material, and are preferably provided with a snap-lock system capable of rigidly locking the cup-shaped bodies 2 and 3 to one another.
  • each lightening formwork 1 moreover comprises at least one protruding wedge member 5, which extends cantilevered from the globoidal-shaped rigid shell 4 preferably in a substantially radial direction, and is specifically structured to be wedged and get stuck in a rigid and stable, though easily removable manner, between the two metal support bars of metal framework 101, i.e. between two longitudinal metal bars 102 of metal framework 101, while attempting to spread the same metal bars apart.
  • protruding wedge member 5 which extends cantilevered from the globoidal-shaped rigid shell 4 preferably in a substantially radial direction, and is specifically structured to be wedged and get stuck in a rigid and stable, though easily removable manner, between the two metal support bars of metal framework 101, i.e. between two longitudinal metal bars 102 of metal framework 101, while attempting to spread the same metal bars apart.
  • the wedge member 5 is adapted to interpose and interlock between the two metal support bars of metal framework 101.
  • the wedge member 5 preferably has an elastically deformable structure that is capable elastically deforming while being fitted between the two metal support bars of metal framework 101, or rather between a pair of mutually adjacent longitudinal metal bars 102.
  • the wedge member 5 is preferably separate and distinct from the rigid shell 4, or rather from the cup-shaped bodies 2 and 3, and is preferably structured so as to be rigidly fixed/interlocked to the globoidal-shaped rigid shell 4.
  • the wedge member 5 preferably has a monolithic structure and/or is preferably made of plastic material.
  • the rigid globoidal-shaped shell 4 formed by the cup-shaped bodies 2 and 3 is preferably flattened at the two opposite polar zones, and the wedge member 5 is preferably located at one of the two polar zones of the shell.
  • the wedge member 5 furthermore extends cantilevered from the rigid shell 4 remaining substantially coaxial to a central/diameter axis A that intersects the two polar zones of rigid shell 4.
  • the globoidal-shaped rigid shell 4 is preferably provided with at least one flat portion 4a preferably substantially circular in shape, and the wedge member 5 extends cantilevered from said flat portion 4a, preferably in a direction substantially perpendicular to said flat portion 4a.
  • the wedge member 5 is preferably placed nearly in the centre of said flat portion 4a.
  • the rigid shell 4 is preferably provided with two flat portions 4a that are arranged at opposite sides of the rigid shell 4, at the two polar zones of the shell, are preferably substantially circular in shape, and are preferably substantially parallel to each other and/or orthogonal to the central/diametrical axis A; and the protruding wedge member 5 extends cantilevered from one of the two flat portions 4a.
  • each cup-shaped body 2, 3 is additionally shaped so as to form a respective polar zone of the rigid shell 4.
  • cup-shaped bodies 2 and 3 are two substantially basin-shaped half-shells that have a substantially flat central portion, and are selectively coupled to each other along their perimeter edge so as to form the rigid shell 4.
  • cup-shaped bodies 2 and 3 are preferably both substantially spherical-cap shaped, and are preferably arranged facing each other, substantially coaxial to the central/diameter axis A.
  • each cup-shaped body 2, 3 preferably lies in a reference plane substantially perpendicular to the central/diameter axis A.
  • the flat portion or portions 4a of the rigid shell 4 are preferably substantially parallel to the lying planes of the perimeter edges of the cup-shaped bodies 2 and 3.
  • the reference/lying plane of the perimeter edges of the cup-shaped bodies 2 and 3 moreover roughly coincides with the equatorial plane of the rigid shell 4.
  • the nominal outer diameter of the cup-shaped bodies 2 and 3 preferably ranges between 200 and 600 mm (millimetres).
  • the height h 2 of cup-shaped body 2 is moreover substantially equal to the height h 3 of cup-shaped body 3.
  • the cup-shaped bodies 2 and 3 have substantially the same dimensions.
  • the height h 2 , h 3 of cup-shaped bodies 2 and 3 preferably ranges between 50 and 500 mm (millimetres) .
  • the height h 2 of cup-shaped body 2 may be greater or lower than the height h 3 of cup-shaped body 3.
  • the outer diameter of the flattened portion or portions 4a ranges between 25% and 50% of the nominal outer diameter d of the cup-shaped body 2, 3.
  • the perimeter edge of the cup-shaped bodies 2 and 3 is preferably provided with a protruding perimeter flange 6, which extends cantilevered flush with the edge of the mouth of the cup-shaped body, preferably while remaining substantially perpendicular to axis A and preferably without interruption along the entire length of the perimeter edge, and the cup-shaped bodies 2 and 3 are adapted to abut one against the other at the perimeter flanges 6.
  • the perimeter flanges 6 of the cup-shaped bodies 2 and 3 additionally have substantially the same width, so that they can be overlapped substantially without interruption along their entire extension.
  • the snap-lock system is preferably located on the perimeter flanges 6 of cup-shaped bodies 2 and 3.
  • each cup-shaped body 2, 3 has, on its perimeter flange 6, a series of protruding anchoring tabs 7 that are suitably distributed along the perimeter flange 6 and are adapted to engage as many pass-through slots 8 specifically made on the perimeter flange 6 of the other cup-shaped body 2, 3.
  • the wedge member 5 is preferably arranged substantially coaxial to the cup-shaped bodies 2 and 3, and is preferably rigidly fixed to solely the cup-shaped body 2. More specifically, the wedge member 5 is preferably firmly fixed on the rigid shell 4, or rather on the cup-shaped body 2, by means of a mechanical interference fit.
  • the protruding wedge member 5 is preferably provided with an annular portion, preferably substantially circular in shape and preferably with an elastically deformable structure, which has a maximum width that over-approximates the nominal distance d existing between the metal support bars, and is adapted to interpose and get stuck between the two metal support bars of the metal framework 101.
  • the annular portion of the wedge member 5 arranges itself substantially coaxial to the central/ diameter axis A of the globoidal-shaped rigid shell 4 when the wedge member 5 is firmly fixed on the rigid shell 4.
  • the protruding wedge member 5 is provided with a central axis B that preferably coincides with the central/diameter axis A of the globoidal-shaped rigid shell 4 when the wedge member 5 is firmly fixed to the rigid shell 4.
  • the wedge member 5 preferably comprises: a substantially plate-like support base 10 which is substantially perpendicular to axis B, and is adapted to be arranged resting on, and be rigidly locked to, the globoidal-shaped rigid shell 4, preferably substantially at the centre of the or of one of the two flattened portions 4a; and a protruding tubular collar or sleeve 11 preferably having an elastically deformable structure, which extends cantilevered from the upper face of the support base 10 parallel to axis B, and is dimensioned so as to wedge and get stuck in a rigid and stable, though easily removable manner, between the two metal support bars of the metal framework 101.
  • the support base 10 is moreover provided with a central through-hole that joins, preferably without interruption, with the inside of the tubular sleeve 11.
  • the support base 10 is preferably also substantially discoidal in shape, with an outer diameter preferably greater than the nominal distance d existing between the two metal support bars of metal framework 101, and is preferably structured so as to be firmly interlocked/ interlockable in abutment on the globoidal-shaped rigid shell 4 by means of a mechanical interference fit.
  • the discoidal support base 10 is preferably provided with a series of preferably lobate-shaped, protruding ridges or appendages 12 (three ridges/ appendages in the example shown) which jut out from the periphery of the support base 10 in a substantially radial direction, and are shaped so as to get stuck on specific protuberances 13 that jut out cantilevering from the surface of the globoidal-shaped rigid shell 4.
  • protruding ridges or appendages 12 are preferably substantially regularly spaced along the periphery of the support base 10, and each of them is preferably provided with a transversal spline or groove, which is adapted to be engaged by a corresponding protuberance 13 of rigid shell 4.
  • the protuberances 13 that jut out cantilevered from the outer surface of the globoidal-shaped rigid shell 4, on the other hand, are preferably substantially cylindrical or truncated-cone in shape, and are dimensioned so as to forcedly wedged into the transversal spline or groove of the locking ridge 12.
  • the support base 10 of wedge member 5 may be retained in abutment on the rigid shell 4 by means of a snap-lock system.
  • the protruding tubular sleeve 11 is preferably substantially cylindrical or truncated-cone in shape, and is preferably made in a single piece with the support base 10.
  • tubular sleeve 11 furthermore, over-approximates the nominal distance d existing between the two metal support bars of the metal framework 101, so that the tubular sleeve 11 takes an oval shape while being fitted between the metal support bars.
  • the tubular sleeve 11 finally has a height h 0 greater than the nominal diameter of the metal support bars of the metal framework 101.
  • the height h 0 of tubular sleeve 11 preferably ranges between 10 and 50 mm (millimetres).
  • the assembly of the modular lightening structure 100 provides, in sequence: joining the cup-shaped bodies 2 and 3 so as to form the globoidal-shaped rigid shell 4; securing the wedge member 5 on the globoidal-shaped rigid shell 4; and finally securing the lightening formwork 1 on the metal framework 101 by interlocking the wedge member 5 between the two metal support bars of the metal framework 101.
  • the wedge member 5 eliminates the need to align the lightening formwork 1 to the two metal support bars of the metal framework 101, greatly speeding up the assembly of the modular lightening structure 100.
  • the protruding wedge member 5 has a thickset and robust structure that makes the wedge member much stronger and more difficult to break than the clips disclosed in Patent EP2516763 B1 .
  • protruding wedge member 5 is easier and cheaper to produce by moulding than the clips disclosed in Patent EP2516763 B1 .
  • the wedge member 5 cane be used also in the lightening formworks currently on the market, structuring the discoidal-shaped support base 10 so as to fit directly on the ridge or annular shoulder that usually surrounds and delimits each flat portion of the formwork.
  • the wedge member 5 may be made in a single piece with any one of the cup-shaped bodies 2 and 3.
  • the top of the annular portion of the wedge member 5, or rather the top of tubular sleeve 11, is preferably provided with a small annular ridge 14 that protrudes outside of the annular portion so as to hinder/make it more difficult to extract the wedge member 5 out of the slit delimited by the two metal support bars of the metal framework 101.
  • annular portion of wedge member 5, or rather the tubular sleeve 11 is closed at the top by a concave cap 15 that preferably joins without interruption with the same annular portion.
  • the wedge member 5 has a cup-shaped structure that is able to form, on the outer surface of the globoidal-shaped rigid shell 4, a small closed chamber that increases the overall volume of the lightening formwork 1, with all the advantages that this entails.

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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)
EP22197156.7A 2021-09-23 2022-09-22 Coffrage d'eclaircissement pour objets en beton arme et structure d'eclaircissement modulaire utilisant ces coffrages Pending EP4155476A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102021000024500A IT202100024500A1 (it) 2021-09-23 2021-09-23 Cassero di alleggerimento per manufatti in cemento armato e struttura modulare di alleggerimento impiegante tali casseri

Publications (1)

Publication Number Publication Date
EP4155476A1 true EP4155476A1 (fr) 2023-03-29

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EP22197156.7A Pending EP4155476A1 (fr) 2021-09-23 2022-09-22 Coffrage d'eclaircissement pour objets en beton arme et structure d'eclaircissement modulaire utilisant ces coffrages

Country Status (2)

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EP (1) EP4155476A1 (fr)
IT (1) IT202100024500A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2516763B1 (fr) 2009-12-21 2013-11-27 Cobiax Technologies AG Elément à demi-coquille destiné à la fabrication d'un corps creux
KR101338944B1 (ko) * 2013-04-09 2013-12-09 김상모 중공슬래브용 경량체
EP3045605A1 (fr) * 2015-01-16 2016-07-20 Heinze Gruppe Verwaltungs GmbH Module de fabrication d'éléments en béton
WO2017212317A1 (fr) * 2016-06-09 2017-12-14 Mirkhani Seyed Soroush Matériau de remplissage de dalle
WO2021019315A1 (fr) * 2019-07-31 2021-02-04 Khaled Azzam Nouvel ensemble de cadres concaves à utiliser en tant que dalles en béton léger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2516763B1 (fr) 2009-12-21 2013-11-27 Cobiax Technologies AG Elément à demi-coquille destiné à la fabrication d'un corps creux
KR101338944B1 (ko) * 2013-04-09 2013-12-09 김상모 중공슬래브용 경량체
EP3045605A1 (fr) * 2015-01-16 2016-07-20 Heinze Gruppe Verwaltungs GmbH Module de fabrication d'éléments en béton
WO2017212317A1 (fr) * 2016-06-09 2017-12-14 Mirkhani Seyed Soroush Matériau de remplissage de dalle
WO2021019315A1 (fr) * 2019-07-31 2021-02-04 Khaled Azzam Nouvel ensemble de cadres concaves à utiliser en tant que dalles en béton léger

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Publication number Publication date
IT202100024500A1 (it) 2023-03-23

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Inventor name: GRAMOLA, GIANFRANCO