EP1101879B1 - Poutre en treillis - Google Patents
Poutre en treillis Download PDFInfo
- Publication number
- EP1101879B1 EP1101879B1 EP00420197A EP00420197A EP1101879B1 EP 1101879 B1 EP1101879 B1 EP 1101879B1 EP 00420197 A EP00420197 A EP 00420197A EP 00420197 A EP00420197 A EP 00420197A EP 1101879 B1 EP1101879 B1 EP 1101879B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- loops
- lattice
- joist
- top joist
- secured
- 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.)
- Expired - Lifetime
Links
Images
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 [3D] 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, i.e. of essentially one-dimensional [1D] or two-dimensional [2D] extent
Definitions
- the invention relates to a lattice beam or truss, intended to be implemented in the field of building, and more particularly in the field of building prefabricated floors.
- the lattice truss floors are laid using struts.
- the prestressed processes can however do without these rows of struts, in floors on crawl space, because of the important inertia of the beams.
- the lattice girders are well known and are for example described in the document EP-A-0 465 776. They are generally used to produce reinforced concrete floors made of joists and interstices concrete or polystyrene.
- the lattice truss described in the aforementioned document typically comprises two sinusoids or zigzag-shaped or diagonal stems, constituting lattice planes, solidarized at the level of threads.
- the upper loops of the lattice planes are secured to a higher rope, especially in the vicinity of the end of their loops upper and lower loops are secured adjacent their end to level of the lower courses.
- EP-A-0 465 777 has also described a lattice girder, whose upper loops are flattened at the level of their zone of attachment with the thread of head.
- the object of the invention is to propose a lattice girder or truss easy to set up easily, likely to develop mechanical characteristics to be able to get rid of the installation of struts, 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 process of transformation and the final appearance of the product remain unchanged.
- This lattice beam or truss comprises two lattice planes in the form of loops successive, secured to three linear rods acting as strings, respectively a lead thread and two basic threads, these two lattice planes being inclined relative to at the bisector of the angle defined by the three strands.
- Each of the lattice plans is secured to the head thread in the vicinity of the end of the upper loops which up.
- Each of the lattice planes is attached to only one of the basic courses in the vicinity of the end of the lower loops, said planes being secured at the level of the face internal of said strings.
- the upper loops are flared or flattened in their area of solidarization with the leading thread, so as to increase the distance separating the two areas of effective joining of the same loop at said thread of the head, the end of said loops extending slightly beyond the head rope to which they are solidarized.
- the upper part of the upper loops is located in the same plan than the lattice plan to which it belongs.
- the upper loops are wider, and wider than the lower loops.
- the length of buckling of the upper ropes is decreased, in particular between the zones of solidarity of the lattice planes.
- the nodes, ie the points of solidarization formed by the flattened upper loops of the lattice planes and the thread superior, are separated by several centimeters, and thus confer a greater rigidity at this fixation of the upper rod. This results in improved maintenance of steel or upper wire.
- These links then function as real recesses and no longer as joints.
- the beam is symmetrical with respect to the plane bisector of the angle constituted by the strings:
- FIG. 1 a schematic side view of the beam according to the invention.
- This beam is basically made of three ropes rectilinear, respectively a head thread (1) and two basic threads (2) and (3), these different threads being advantageously made of stainless steel.
- These threads are secured by means of lattice planes (4) and (5) lateral.
- These plans lattices are each constituted by a succession of loops or sinusoids, diagonals or zigzags, mounted on the same plane, and extending slightly obliquely by relative to the bisecting plane of the beam thus formed.
- the upper loops (6) of the lattice planes are flared, so as to optimize the length l , respectively the so-called embedding length, separating the contact points (10, 11 ) and in particular the fastening of the loops (6) at the level of the head thread (1).
- the permissible compressive stress is increased because a part of said effort is transmitted to the upper loops of the two lattice planes, and hence the compressive stresses at the level of the steel constituting the head rope (1), in particular of the part included inside the loop.
- the particular shape of the upper loop (6) of each of the lattice planes results in a decrease in the buckling length L , respectively L ' , of the constituent steel of the upper wire between the welds. loops of the lattice on said steel, that is to say between the zones of attachment of said loops on the head thread.
- the upper chord is no longer composed of one but of two steel bars (1, 8), in order to increase the inertia of the beam and consequently reduce the arrow when it is loaded.
- these two bars are in contact from each other, the lower bar (8) having a larger diameter than the wire (1), of so as to occupy all the available space at this level between the two lattice planes antagonists.
- the upper loops are secured, in particular by welding to each of the two strands (1, 8).
- the two threads are unwound simultaneously continuously on machines automatic and resistance welded to the two lattice planes, all along the length of the beam.
- the buckling length of the lower rope (8) is reduced compared to that of the rope upper (1) of smaller diameter, because of its larger diameter, conferring greater resistance to buckling. Moreover, given the joined nature of the two upper threads, the lower thread (8) prevents the vertical buckling of the thread superior (1).
- both diagonal welds on the two headbars increase the stiffness of this assembly and also transform it into embedding. It follows an increase of the breaking load by buckling of these diagonals.
- the overall resistance of the truss is also increased. As a corollary, we increase the resistance to the shear force of the beam, the latter being limited by the load causing the buckling of the lattice wires and the resistance of the welds.
- the upper loops (6) are secured to both threads (1) and (8) by welding. In this way, the compression effect is optimized generated.
- the potential range of the beam is increased.
- the length of buckling of the lower head thread (8) is reduced compared to the upper head thread (1). This results in the result of an increase in overall strength of the beam.
- Such a beam exhibits much better performances than those of two beams horseshoes in the same concrete pad.
- said head thread is in fact constituted only one element (9), but has a complex eight-section shape of figure, whose bottom loop is larger in diameter than the loop of the up, as can be seen for example in Figure 6.
- the upper loops (6) are secured at each of the two loops constituent of the said eight.
- This form aims to confer the same characteristics, in particular mechanical, to the and going to the beam.
- the lattice planes are symmetrical to one another by relative to the bisecting plane of the beam.
- the lower loops of the lattice planes are much less flared than the upper loops because they are intended to be embedded in the concrete pad which brings the installation characteristics to the diagonals of the lattice.
- the range without prop or the distances between struts of the beams or lattice girders made according to the invention are strongly improved by the new geometry of said beams and by the increase of 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)
- Reinforcement Elements For Buildings (AREA)
- Holo Graphy (AREA)
- Telescopes (AREA)
- Revetment (AREA)
- Paper (AREA)
Description
Claims (5)
- 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), et dans laquelle 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) également dénommée longueur d'encastrement (l, l') 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, 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 revendication 1, 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 et 2, 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 3, 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 et 2, caractérisée en ce que le filant de tête (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 (4, 5) 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 |
|---|---|---|---|
| FR9914578 | 1999-11-19 | ||
| FR9914578A FR2801330B1 (fr) | 1999-11-19 | 1999-11-19 | Poutre en treillis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1101879A1 EP1101879A1 (fr) | 2001-05-23 |
| EP1101879B1 true 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) |
Families Citing this family (3)
| 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 |
| 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 |
Family Cites Families (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 |
| AT318207B (de) * | 1968-07-22 | 1974-10-10 | Oesterr Alpine Montan | Bewehrungsstahl |
| DE2329943A1 (de) * | 1973-06-13 | 1975-01-09 | Rheinbau Gmbh | Gittertraeger |
| AT359253B (de) * | 1979-02-27 | 1980-10-27 | Bucher Franz | Bewehrungselement |
| YU72989A (sh) * | 1988-04-22 | 1992-07-20 | Fer, Fertigteil-Entwicklungs-Ring Gesellschaft M.B.H. & Co. K.G. | Rešetkasti nosač za izradu delimično predfabrikovanih tavanica od armiranog betona |
| DE59102324D1 (de) | 1990-07-12 | 1994-09-01 | Badische Drahtwerke Gmbh | Gitterträger. |
| FR2736954B3 (fr) * | 1995-07-20 | 1997-10-17 | Cote Francois Georges Albert | Amenagement structurel applique aux armatures a treillis metalliques soudes, pour ameliorer leur raideur longitudinale |
| FR2752257B1 (fr) * | 1996-08-08 | 1998-09-18 | 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 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
- 2000-09-26 DE DE60007824T patent/DE60007824T2/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2211486T3 (es) | 2004-07-16 |
| FR2801330B1 (fr) | 2002-05-31 |
| EP1101879A1 (fr) | 2001-05-23 |
| FR2801330A1 (fr) | 2001-05-25 |
| DE60007824T2 (de) | 2004-12-02 |
| DE60007824D1 (de) | 2004-02-26 |
| ATE258258T1 (de) | 2004-02-15 |
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