EP1101879A1 - Poutre en treillis - Google Patents
Poutre en treillis Download PDFInfo
- Publication number
- EP1101879A1 EP1101879A1 EP00420197A EP00420197A EP1101879A1 EP 1101879 A1 EP1101879 A1 EP 1101879A1 EP 00420197 A EP00420197 A EP 00420197A EP 00420197 A EP00420197 A EP 00420197A EP 1101879 A1 EP1101879 A1 EP 1101879A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- loops
- planes
- head
- secured
- lattice
- 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
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Classifications
-
- 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
- E04C5/065—Light-weight girders, e.g. with precast parts
-
- 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
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
Definitions
- the invention relates to a truss beam or truss, intended to be used. in the field of building, and more particularly in the field of the realization of prefabricated floors.
- Lattice beams are well known and are for example described in the document EP-A-0 465 776. They are generally used to make reinforced concrete floors made of beams and concrete or polystyrene interjoists.
- the truss beam described in the aforementioned document typically comprises two sinusoids or zigzag or diagonal rods, constituting trellis planes, secured at the level of streaks.
- the upper loops of the trellis planes are secured to an upper strand, in particular in the vicinity of the end of their loops upper, and the lower loops are secured in the vicinity of their end at lower streak level.
- these beams are unsuitable for crossing large spans without prop or equivalent support device, which proves harmful for certain applications, in particular for crawl space floors where art processes previous propose beams of more than four meters without requiring shoring.
- the object of the invention is to propose a production truss beam or truss easy, easy to set up, likely to develop mechanical characteristics suitable for overcoming the installation of props, without requiring a significant reinforcement of the materials used for the realization of the concrete pad which coats the basic steels and serves as a support for interjoists.
- the mussels, the whole transformation process and the final appearance of the product remain unchanged.
- This truss or truss comprises two trellis planes in the form of loops successive, secured to three linear rods acting as threads, respectively a head line and two base lines, these two trellis planes being inclined relative to at the bisector of the angle defined by the three threads.
- Each of the trellis planes is secured to the leading edge near the end of the upper loops which constitute them.
- Each of the trellis planes is secured to only one of the basic strands in the vicinity of the end of the lower loops, said planes being secured at the level of the face internal of said streaks.
- the beam according to the invention is characterized in that the upper loops are flared or flattened at the level of their area of attachment to the head thread, so as to increase the distance separating the two zones of effective attachment of the same loop at said head thread, the end of said loops extending slightly beyond the headline to which they are attached.
- the upper loops are wider, and wider than the lower loops.
- the buckling length of the upper struts is reduced, in particular between the joining areas of the trellis planes.
- the nodes i.e. the points of joining formed by the flattened upper loops of the trellis planes and the stringing higher, are spaced several centimeters apart, and thereby confer greater rigidity to this fixation of the upper rod. This provides improved maintenance of steel or upper thread.
- These links then function as real recesses and no longer as joints.
- the upper loops of the trellis planes then become very flattened, they participate in the compression effort, thereby reducing the compression stresses generated at the headline in the part inside the loop.
- this compression participates in the shortening of said head thread, so that the deflection of the beam is also reduced.
- the beam is symmetrical with respect to the plane angle bisector formed by the threads.
- the headline is in fact made up of two ropes, positioned one below the other and one in contact with the other, and at the level which is secured to each of the upper loops of said lattice planes.
- FIG. 1 is a side view of a first embodiment of the invention, of which Figure 2 is a schematic representation in cross section.
- FIG. 3 is a schematic perspective representation of the beam in FIGS. 1 and 2.
- Figure 4 is a view similar to Figure 1 of a second embodiment of the invention, of which Figures 5 and 6 are schematic representations in cross section.
- FIG. 1 a schematic side view of the beam according to the invention.
- This beam is basically made up of three streaks rectilinear, respectively a head line (1) and two base lines (2) and (3), these different struts being advantageously made of stainless steel.
- These strings are secured by means of lateral trellis planes (4) and (5).
- These plans of trellises each consist of a succession of loops or sinusoids, diagonals or zigzags, mounted in the same plane, and extending slightly obliquely by relation to the bisector plane of the beam thus formed.
- the upper loops (6) of the planes of trellis are flared, so as to optimize the length 1, respectively the, called installation length, separating the contact points (10, 11) and in particular of securing of the loops (6) at the level of the head thread (1).
- the admissible compressive force is increased because part of said force is transmitted to the upper loops of the two trellis planes, and therefore we decrease the compressive stresses at the level of the steel making up the head thread (1), including the part inside the loop.
- the upper chord is made up not of one but of two steel bars (1, 8), in order to increase the inertia of the beam and as a corollary to decrease the deflection when it is loaded.
- these two bars are in contact one from the other, the lower bar (8) having a diameter greater than the thread (1), so as to occupy all the space available at this level between the two trellis planes antagonists.
- the upper loops are joined, in particular by welding to each of the two streaks (1, 8).
- the two strands are unrolled simultaneously continuously on machines automatic and welded by resistance to the two trellis planes, and this, over the entire length of the beam.
- the buckling length of the lower strand (8) is reduced compared to that of the strand upper (1) of smaller diameter, due to its larger diameter, giving it greater resistance to buckling. Furthermore, given the joined nature of the two upper strands, the lower strand (8) prevents vertical buckling of the strand upper (1).
- the straight bars of the trellis and in particular the basic strands (2) and (3), the buckling length of which is also shortened.
- the two diagonal welds on the two head bars increase the rigidity of this assembly and also transform it into recess. It follows an increase of the buckling breaking load of these diagonals.
- the overall resistance of the beam is also increased. As a corollary, the resistance to the shear force of the beam, this being limited by the load causing the buckling of the trellis wires and by the resistance of the welds.
- the upper loops (6) are secured to the two ropes (1) and (8) by welding. In this way, the compression effect is optimized as well generates.
- said head thread is in fact made up that of a single element (9), but has a complex shape in section in eight of figure, the bottom loop of which is larger in diameter than the bottom loop top, as can be seen for example in Figure 6.
- the upper loops (6) are secured at each of the two loops constituting said eight.
- This shape aims to give the same characteristics, in particular mechanical, to the streak and leaving with the beam.
- the trellis planes are symmetrical to each other by relative to the bisector plane of the beam.
- the lower loops of the trellis planes are much less flared than the upper loops, as they are intended to be embedded in the concrete pad which brings the embedding characteristics to the diagonals of the trellis.
- the span without forestay or the distances between struts of beams or lattice girders produced in accordance with the invention are found strongly improved by the new geometry of said beams and by the increase in mechanical characteristics, in particular head threads and diagonals.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
- Holo Graphy (AREA)
- Telescopes (AREA)
- Paper (AREA)
- Reinforcement Elements For Buildings (AREA)
- Revetment (AREA)
Abstract
Description
La figure 3 est une représentation schématique en perspective de la poutre des figures 1 et 2.
La figure 4 est une vue analogue à la figure 1 d'une seconde forme de réalisation de l'invention, dont les figures 5 et 6 sont des représentations schématiques en section transversale.
Claims (6)
- Poutre en treillis comprenant deux plans de treillis (4, 5) en forme de boucles successives, solidarisées à trois tiges linéaires faisant fonction de filants, respectivement un filant de tête (1) et deux filants de base (2, 3), ces deux plans de treillis étant inclinés par rapport à la bissectrice de l'angle défini par les trois filants, chacun des plans de treillis (4, 5) étant solidarisé au filant de tête (1) au voisinage de l'extrémité des boucles supérieures (6) qui les constituent et à un filant de base (2, 3) au voisinage de l'extrémité des boucles inférieures (7), lesdits plans étant solidarisés au niveau de la face interne desdits filants (2, 3), caractérisée en ce que les boucles supérieures (6) sont évasées ou aplaties au niveau de leur zone de solidarisation avec le filant de tête (1), de telle sorte à augmenter la distance séparant les points de solidarisation effective (10, 11) d'une même boucle (6) au niveau dudit filant de tête, l'extrémité desdites boucles (6) s'étendant légèrement au delà du filant de tête (1) auquel elles sont solidarisées.
- Poutre en treillis selon la revendication 1, caractérisée en ce que la partie supérieure des boucles supérieures (6) s'étendant légèrement au delà du filant de tête (1) est située dans le même plan que le plan de treillis (4) auquel elle appartient.
- Poutre en treillis selon l'une des revendications 1 et 2, caractérisée en ce qu'elle est symétrique par rapport au plan bissecteur de l'angle constitué par les filants (1, 2, 3).
- Poutre en treillis selon l'une des revendications 1 à 3, caractérisée en ce que le filant de tête est en fait constitué de deux filants, respectivement un filant de tête supérieur (1) et un filant de tête inférieur (8), positionnés l'un au dessous de l'autre, et l'un en contact de l'autre, et au niveau de chacun desquels est solidarisée chacune des boucles supérieures (6) desdits plans de treillis.
- Poutre en treillis selon la revendication 4, caractérisée en ce que le diamètre du filant de tête inférieur (8) est supérieur à celui du filant de tête supérieur (1), et en ce que le filant de tête inférieur (8) occupe l'espace séparant les deux plans de treillis à ce niveau.
- Poutre en treillis selon l'une des revendications 1 à 3, caractérisée en ce que le filant de tête (1, 9) présente une section transversale en forme de huit de chiffre, dont la boucle inférieure est de diamètre supérieur à celui de la boucle supérieure, et en ce que les boucles supérieures (6) des plans de treillis (2, 3) sont solidarisées au niveau de chacune des boucles, respectivement inférieure et supérieure dudit filant (9).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9914578A FR2801330B1 (fr) | 1999-11-19 | 1999-11-19 | Poutre en treillis |
FR9914578 | 1999-11-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1101879A1 true EP1101879A1 (fr) | 2001-05-23 |
EP1101879B1 EP1101879B1 (fr) | 2004-01-21 |
Family
ID=9552307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00420197A Expired - Lifetime EP1101879B1 (fr) | 1999-11-19 | 2000-09-26 | Poutre en treillis |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1101879B1 (fr) |
AT (1) | ATE258258T1 (fr) |
DE (1) | DE60007824T2 (fr) |
ES (1) | ES2211486T3 (fr) |
FR (1) | FR2801330B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2488821A (en) * | 2011-03-10 | 2012-09-12 | John Christopher Holt | Multi element truss for structural panel |
CN110629917A (zh) * | 2019-09-20 | 2019-12-31 | 中国五冶集团有限公司 | 一种楼层板结构 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005006449B4 (de) * | 2005-02-12 | 2008-01-31 | Syspro-Gruppe Betonbauteile E.V. | Gitterträger für ein aus Betonfertigplatten bestehendes Wandelement |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1234326A (fr) * | 1958-06-11 | 1960-10-17 | Bottiger & Co | Poutre soudée pour le montage de planchers et procédé pour sa fabrication |
DE1936683A1 (de) * | 1968-07-22 | 1970-01-29 | Oesterr Alpine Montan | Bewehrungsstahl |
DE2329943A1 (de) * | 1973-06-13 | 1975-01-09 | Rheinbau Gmbh | Gittertraeger |
WO1980001818A1 (fr) * | 1979-02-27 | 1980-09-04 | F Bucher | Armature pour beton arme et procede pour sa fabrication |
EP0339018A1 (fr) * | 1988-04-22 | 1989-10-25 | "FER" FERTIGTEIL- ENTWICKLUNGS-RING GESELLSCHAFT M.B.H. & Co. K.G. | Poutre en treillis pour la fabrication de planchers partiellement préfabriqués en béton armé |
EP0465777A1 (fr) * | 1990-07-12 | 1992-01-15 | BADISCHE DRAHTWERKE GmbH | Poutre en treillis |
FR2736954A1 (fr) * | 1995-07-20 | 1997-01-24 | Cote Francois Georges Albert | Amenagement structurel applique aux armatures a treillis metalliques soudes, pour ameliorer leur raideur longitudinale |
FR2752257A1 (fr) * | 1996-08-08 | 1998-02-13 | Prod Speciaux D Isolation P S | Systeme d'isolation de planchers beton comportant des poutrelles en treillis metallique |
-
1999
- 1999-11-19 FR FR9914578A patent/FR2801330B1/fr not_active Expired - Lifetime
-
2000
- 2000-09-26 DE DE60007824T patent/DE60007824T2/de not_active Expired - Lifetime
- 2000-09-26 EP EP00420197A patent/EP1101879B1/fr not_active Expired - Lifetime
- 2000-09-26 ES ES00420197T patent/ES2211486T3/es not_active Expired - Lifetime
- 2000-09-26 AT AT00420197T patent/ATE258258T1/de not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1234326A (fr) * | 1958-06-11 | 1960-10-17 | Bottiger & Co | Poutre soudée pour le montage de planchers et procédé pour sa fabrication |
DE1936683A1 (de) * | 1968-07-22 | 1970-01-29 | Oesterr Alpine Montan | Bewehrungsstahl |
DE2329943A1 (de) * | 1973-06-13 | 1975-01-09 | Rheinbau Gmbh | Gittertraeger |
WO1980001818A1 (fr) * | 1979-02-27 | 1980-09-04 | F Bucher | Armature pour beton arme et procede pour sa fabrication |
EP0339018A1 (fr) * | 1988-04-22 | 1989-10-25 | "FER" FERTIGTEIL- ENTWICKLUNGS-RING GESELLSCHAFT M.B.H. & Co. K.G. | Poutre en treillis pour la fabrication de planchers partiellement préfabriqués en béton armé |
EP0465777A1 (fr) * | 1990-07-12 | 1992-01-15 | BADISCHE DRAHTWERKE GmbH | Poutre en treillis |
FR2736954A1 (fr) * | 1995-07-20 | 1997-01-24 | Cote Francois Georges Albert | Amenagement structurel applique aux armatures a treillis metalliques soudes, pour ameliorer leur raideur longitudinale |
FR2752257A1 (fr) * | 1996-08-08 | 1998-02-13 | Prod Speciaux D Isolation P S | Systeme d'isolation de planchers beton comportant des poutrelles en treillis metallique |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2488821A (en) * | 2011-03-10 | 2012-09-12 | John Christopher Holt | Multi element truss for structural panel |
GB2488821B (en) * | 2011-03-10 | 2017-02-15 | Christopher Holt John | Truss |
CN110629917A (zh) * | 2019-09-20 | 2019-12-31 | 中国五冶集团有限公司 | 一种楼层板结构 |
Also Published As
Publication number | Publication date |
---|---|
ES2211486T3 (es) | 2004-07-16 |
ATE258258T1 (de) | 2004-02-15 |
FR2801330A1 (fr) | 2001-05-25 |
DE60007824T2 (de) | 2004-12-02 |
FR2801330B1 (fr) | 2002-05-31 |
DE60007824D1 (de) | 2004-02-26 |
EP1101879B1 (fr) | 2004-01-21 |
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