EP0005092A1 - Brettförmiges Bauelement und ein derartiges Element umfassende Struktur - Google Patents

Brettförmiges Bauelement und ein derartiges Element umfassende Struktur Download PDF

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Publication number
EP0005092A1
EP0005092A1 EP79400205A EP79400205A EP0005092A1 EP 0005092 A1 EP0005092 A1 EP 0005092A1 EP 79400205 A EP79400205 A EP 79400205A EP 79400205 A EP79400205 A EP 79400205A EP 0005092 A1 EP0005092 A1 EP 0005092A1
Authority
EP
European Patent Office
Prior art keywords
reinforcement
concrete
cells
mesh
reinforced
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
EP79400205A
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English (en)
French (fr)
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EP0005092B1 (de
Inventor
Jacques Dardare
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.)
CENTRE D'ETUDES ET DE RECHERCHES DE L'INDUSTRIE DU BETON MANUFACTURE
Centre dEtudes et de Recherche de lIndustrie du Beton CERIB
Original Assignee
CENTRE D'ETUDES ET DE RECHERCHES DE L'INDUSTRIE DU BETON MANUFACTURE
Centre dEtudes et de Recherche de lIndustrie du Beton CERIB
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 CENTRE D'ETUDES ET DE RECHERCHES DE L'INDUSTRIE DU BETON MANUFACTURE, Centre dEtudes et de Recherche de lIndustrie du Beton CERIB filed Critical CENTRE D'ETUDES ET DE RECHERCHES DE L'INDUSTRIE DU BETON MANUFACTURE
Publication of EP0005092A1 publication Critical patent/EP0005092A1/de
Application granted granted Critical
Publication of EP0005092B1 publication Critical patent/EP0005092B1/de
Expired legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders

Definitions

  • the present invention relates to a building element in the form of a plank and a structure comprising such an element.
  • board-shaped building elements is meant here elements of relatively small thickness, generally less than 10 cm, of width greater than the thickness but generally less than 50 cm, and of length on the order of several meters .
  • Such elements are used in the building industry to make structures such as frames, scaffolding, //
  • the object of the invention is to provide a building element in the form of a handy board and at a cost close to that of usual building materials.
  • the element is made of concrete reinforced by a reticulated reinforcement extending substantially over the entire length and width of the element and over at least half of the thickness thereof, said reinforcement comprising, as known per se, a mesh whose cells are delimited by a side wall in the form of a strip substantially perpendicular to the large faces of the element, the concrete completely coating the mesh and filling the cells .
  • This element has a high resistance to forces directed parallel to the long side of its section transverse and regular mechanical resistance to the forces applied in the other directions of space. This is due to the fact that, thanks to the compressive strength of the B and the deformations in tension and flexion of the mesh are limited by the concrete resistant cores which fill the alveoli.
  • the structure of the mesh and, in particular, the dimensions and the shape of the cells are determined so as to allow correct stress routing and to provide the concrete cores filling the cells with sufficient resistance to forces. applied to them.
  • the size of the cells must be such that the concrete cores which it delimits are capable, without disintegration, of withstanding the forces communicated to them by the mesh.
  • the strip-shaped wall of each cell has a width at least equal to 1 cm.
  • the dimension of the cell measured perpendicular to its wall, remains less than 10 cm. This maximum may be increased in the case of concrete loaded with aggregates of large particle size.
  • the shape of the cell it is desirable that it be delimited by a strip-shaped surface remaining parallel to the axis of the cell and having, in cross section, a closed polygonal contour. or symmetrical curve with respect to its center.
  • the cells of the mesh are identical and regularly distributed in the mesh.
  • the invention also relates to a structure comprising several elements in the form of a board.
  • the element 1 illustrated in FIG. 1 comprises a crosslinked reinforcement 10 embedded in concrete 14.
  • the frame 10 comprises a rectangular frame 11 and a mesh 12 filling this frame, both being formed by means of a strip material.
  • the mesh 12 defines cells 13 with a closed contour on itself, these cells being all identical, with the possible exception of those bordering the frame 11, and being regularly distributed in the mesh.
  • the walls of the cells 13 are parallel to the axes of these cells and, like the sides of the frame 11, perpendicular to the faces of the latter.
  • the cells 13 are delimited by a surface of hexagonal cross section.
  • each cell may take the form of other polygons ( Figure 2) or be curved ( Figure 3), while retaining, preferably, a symmetrical shape relative to its center.
  • a strip material compatible with the concrete used and having a high tensile strength and sufficient rigidity is used. May be suitable, for example, metal strips or tapes of non-metallic, rigid or stiffened materials.
  • FIG. 4 illustrates a particular embodiment of a crosslinked reinforcement.
  • Steel strips 20, 21, 22, Vietnamese strips are unwound rollers 23, 24, 25 Vietnamese
  • the strip 20 is intended to constitute the frame 11.
  • This assembly is carried out by welding or mechanically by riveting or stapling. It should be noted that this assembly must be carried out with care because it must resist the tensile and shear forces which develop at the interface between contiguous cells when the element containing the reinforcement is subjected to stresses.
  • strips 30 (FIG. 5) which are each subjected to a cutting operation to form cuts 32, parallel to the edges of the strip, which divide into three equal strips 33a, 33b, 33c of the strip segments distributed along the latter being separated from each other by intervals 31 which are not precut.
  • the strip is then subjected to a deployment operation consisting in folding the strips 33a, 33b, 33c alternately on one side and the other of the strip plane, the strips 33a and 33c located along the edges of the strip being at each folded back on the side of the strip opposite to that on the side of which is folded the central strip 33b located initially between these two strips.
  • Flats 34 are formed at the tops of the folded portions to enable the construction of the mesh by assembling the strips P LOYES, the assembly being made for example by welding.
  • FIG. 6 illustrates another method of manufacturing an armature according to the invention.
  • the mesh is obtained from a braid 40 woven so as to form the cells and stiffened by immersion in a material, for example a resin, which stiffens by solidifying.
  • braids assembled together such as the strips 21, 22 illustrated in FIG. 4, after having been pleated or wavy and stiffened.
  • the reinforcement is coated over its entire periphery with a layer of concrete 14.
  • This coating aims, on the one hand, to protect the reinforcement from possible corrosion and, on the other hand, to resist the thrusts exerted by the cores , in particular by bulging them, when the armature is subjected to forces. If the coating proves to be insufficient to fulfill this latter function, it is possible to reinforce the coating concrete by means of a skin reinforcement 15 constituted by a wire mesh with fine and tight meshes surrounding the cross-linked reinforcement over all its periphery.
  • the thickness of the coating concrete 14, in particular if it is reinforced, can be limited to a value of the order of cm, for example between 0.5 and 2 cm.
  • the reinforcement must occupy at least half the thickness of the element so that the mechanical properties of this element are as close as possible to those of a homogeneous material.
  • the reinforcement is placed in a mold before or after filling it with concrete.
  • the concrete used is a hydraulic binder concrete or the like having good resistance to compression.
  • the mesh is made of steel strip 20 mm wide, the steel being a class A33 steel having an elastic limit equal to 18 bar and a residual elongation of 18%.
  • the rectangular frame 11 (FIG. 8) is made of strip 3 mm thick. Its length and width are respectively 5 m and 18.6 cm.
  • the cells 13 are made of strip 2 mm thick and with a hexagonal cross section.
  • the dimensions referenced a, b and c in Figure 8 are respectively equal to 75 mm, 60 mm and 15 mm. Welds are made between all adjacent sides of the cells.
  • a wire mesh 15 of steel wire with a diameter of 1 mm and a square mesh with a side of 15 mm is provided, as a skin reinforcement, a wire mesh 15 of steel wire with a diameter of 1 mm and a square mesh with a side of 15 mm.
  • the concrete is produced with a cement dosage of 500 kg / m 3 and aggregates of maximum dimension equal to 8 mm.
  • the compressive strength measured at 28 days is 550 bars and the tensile strength measured at 28 days is 42 bars.
  • the reinforcement is positioned in a mold using spacers before pouring the concrete.
  • the concrete is placed using a vibrating rule.
  • the board 50 obtained, shown in cross section in Figure 7 has a length equal to 5.05 m, a height h equal to 23 cm and a thickness e equal to 4 cm.
  • a bending test of this assembly in the direction of the height was carried out as illustrated in FIG. 10, the boards resting horizontally on edge on two distant support points with a length L 1 equal to 4.80 m.
  • a bending test of a board in the transverse direction was then carried out as shown in FIG. 11, the board resting horizontally flat on two distant support points with a length L 2 and being subjected to a vertical load F 2 at a point located at equal distances from the support points.
  • the board has good resistance to the forces exerted along the long axis of its cross section.
  • the rupture is attributable to a defective weld between two contiguous cells
  • the results of the tests show that the concrete element according to the invention exhibits a behavior mechanical similar to that of a homogeneous material for fairly high load values. Indeed, the ratio between breaking load and cracking load is 1.40 in the transverse direction.
  • the board-shaped element according to the invention has entirely acceptable mechanical flexural characteristics having regard to the use that can be envisaged for such elements.
  • plank-shaped element in accordance with the invention may be suitable for the production of crash barriers along traffic lanes, lost formwork, scaffolding, etc.
  • the element in accordance with the invention can be reinforced in additional manner by known methods, for example by the installation of rectilinear reinforcements with circular section along the long sides of the reticulated reinforcement.
  • the element may be impregnated with a resin which hardens upon polymerization. It could also be prestressed.
  • the reinforcement of the coating concrete surrounding the crosslinked reinforcement can be carried out by impregnation by means of a polymerizable resin.
  • FIGS 12 to 15 illustrate structures comprising several boards assembled together.
  • the assembly can be carried out by placing the boards 60 on top of each other and by assembling them, for example, by gluing to form a lamel membrane. laire ( Figure 12) or a long arc ( Figure 13).
  • the boards 70 are assembled in them and, optionally, to intermediate elements, by means of pins or bolts 76 crossing the boards perpendicular to their large faces. It should be noted that drilling a hole in a board, through a cell, does not cause cracks and does not affect the mechanical properties of the board in any way.
  • the boards thus assembled can be used for the realization of frame or floor.
  • FIG. 15 illustrates another structure comprising elements 80 in accordance with the invention. These form the sides of a hollow monolith profile and are connected by concrete connection parts 86. Connection reinforcements connected to the crosslinked reinforcements of the elements 80 can be provided in the connection parts 86.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Panels For Use In Building Construction (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Rod-Shaped Construction Members (AREA)
EP79400205A 1978-04-19 1979-03-30 Brettförmiges Bauelement und ein derartiges Element umfassende Struktur Expired EP0005092B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7811587A FR2423600A1 (fr) 1978-04-19 1978-04-19 Procede et armature pour le renforcement du beton et element de beton obtenu
FR7811587 1978-04-19

Publications (2)

Publication Number Publication Date
EP0005092A1 true EP0005092A1 (de) 1979-10-31
EP0005092B1 EP0005092B1 (de) 1983-03-30

Family

ID=9207346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400205A Expired EP0005092B1 (de) 1978-04-19 1979-03-30 Brettförmiges Bauelement und ein derartiges Element umfassende Struktur

Country Status (5)

Country Link
EP (1) EP0005092B1 (de)
AT (1) AT368229B (de)
DE (1) DE2965089D1 (de)
ES (3) ES251127Y (de)
FR (1) FR2423600A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142674A (en) * 1983-07-04 1985-01-23 Elkem As Reinforced concrete building elements
WO1999039887A1 (en) * 1998-02-06 1999-08-12 Farrell, Elizabeth-Anne, Aileen Reinforcing a settable material
ITRM20090075A1 (it) * 2009-02-19 2010-08-20 Pasquale Impero Armatura a celle esagonali per cemento armato.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE127104C (de) *
GB191302856A (en) * 1913-02-04 1913-07-10 Harry Howard Henthorne Improvements in or relating to Reinforced Concrete Slabs, Blocks and the like.
FR625005A (fr) * 1926-10-25 1927-08-01 Irving Iron Works Co Dalle en béton armé
GB359322A (en) * 1931-01-14 1931-10-22 Alfred Percival Gupwell An improved steel or metal mesh for reinforcing concrete, asphalt and like material
GB700402A (en) * 1949-04-28 1953-12-02 Ward Hugh Richards Improvements relating to components for buildings
CH358574A (de) * 1958-07-25 1961-11-30 Stampfli Joseph Bauelement
DE1509048A1 (de) * 1963-06-19 1969-02-06 Wuppermann Gmbh Theodor Armierte Bauplatte
DE1759133A1 (de) * 1968-04-03 1971-06-03 Fritz Siegmeier Strassenbelag

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE127104C (de) *
GB191302856A (en) * 1913-02-04 1913-07-10 Harry Howard Henthorne Improvements in or relating to Reinforced Concrete Slabs, Blocks and the like.
FR625005A (fr) * 1926-10-25 1927-08-01 Irving Iron Works Co Dalle en béton armé
GB359322A (en) * 1931-01-14 1931-10-22 Alfred Percival Gupwell An improved steel or metal mesh for reinforcing concrete, asphalt and like material
GB700402A (en) * 1949-04-28 1953-12-02 Ward Hugh Richards Improvements relating to components for buildings
CH358574A (de) * 1958-07-25 1961-11-30 Stampfli Joseph Bauelement
DE1509048A1 (de) * 1963-06-19 1969-02-06 Wuppermann Gmbh Theodor Armierte Bauplatte
DE1759133A1 (de) * 1968-04-03 1971-06-03 Fritz Siegmeier Strassenbelag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142674A (en) * 1983-07-04 1985-01-23 Elkem As Reinforced concrete building elements
WO1999039887A1 (en) * 1998-02-06 1999-08-12 Farrell, Elizabeth-Anne, Aileen Reinforcing a settable material
ITRM20090075A1 (it) * 2009-02-19 2010-08-20 Pasquale Impero Armatura a celle esagonali per cemento armato.

Also Published As

Publication number Publication date
ES249009Y (es) 1981-04-16
FR2423600A1 (fr) 1979-11-16
ATA293679A (de) 1982-01-15
AT368229B (de) 1982-09-27
FR2423600B1 (de) 1983-01-28
ES251127U (es) 1981-02-01
ES249008Y (es) 1981-04-16
EP0005092B1 (de) 1983-03-30
ES249009U (es) 1980-11-16
DE2965089D1 (en) 1983-05-05
ES249008U (es) 1980-11-16
ES251127Y (es) 1981-07-16

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