WO1982002222A1 - Poutre en treillis - Google Patents

Poutre en treillis Download PDF

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Publication number
WO1982002222A1
WO1982002222A1 PCT/AT1981/000031 AT8100031W WO8202222A1 WO 1982002222 A1 WO1982002222 A1 WO 1982002222A1 AT 8100031 W AT8100031 W AT 8100031W WO 8202222 A1 WO8202222 A1 WO 8202222A1
Authority
WO
WIPO (PCT)
Prior art keywords
bars
bar
cross bars
reinforcement
lattice girder
Prior art date
Application number
PCT/AT1981/000031
Other languages
German (de)
English (en)
Inventor
Franz Bucher
Original Assignee
Franz Bucher
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
Priority to JP50344081A priority Critical patent/JPS58500418A/ja
Application filed by Franz Bucher filed Critical Franz Bucher
Priority to DE8282900001T priority patent/DE3167760D1/de
Priority to DE19818138571U priority patent/DE8138571U1/de
Publication of WO1982002222A1 publication Critical patent/WO1982002222A1/fr

Links

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

Definitions

  • the invention relates to a lattice girder for the production of reinforced concrete ceilings, with at least one longitudinal bar as the upper chord, at least one longitudinal bar as the lower chord, and with transverse bars connecting them, each longitudinal bar of the lower chord being reinforced by at least one shorter additional bar, the length and arrangement of which is adapted to the course of the moment, directly touches the longitudinal bar over the entire length and is connected to it in a force-transmitting manner, and all the bars of the lower flange lie in a horizontal plane.
  • the current state of reinforced concrete science provides in the classic dimensioning theory for components subjected to bending a correlation between tensile and compressive forces via the shear absorption capacity of the concrete. This assumption presupposes that the reinforcement steel anchoring the tensile forces in the lowest possible arrangement in the tensile zone of the component subjected to bending has an adhesive force. Only when this adhesion is guaranteed does the reinforcing steel transfer its forces to the surrounding concrete, which transmits them to the concrete pressure zone via its shear strength.
  • AT-PS 309.757 shows a first solution in which the shorter additional bars can dispense with the adhesive length and allow the reinforcement bars to be arranged close to one another allow in the pressure zone of the concrete.
  • a reinforcement element which can also form part of a lattice girder of the type mentioned at the outset, has subsequently become known (AT-PS 359.253), in which the reinforcement bars of the tensile zone, that is to say of the lower chord, which are provided in staggered lengths, are directly welded to one another in a manner are that about the welded joints a complete Force transfer from the shorter to the longer reinforcing bars can take place, so that the tensile force is reduced in the end points of the additional bars.
  • the reinforcement bars of the lower chord are thus directly adjacent to one another in the lowest possible level, which prevents an excessive width of the lattice girder in the lower chord.
  • the direct welding which is an almost optimal solution to the problem with rod bundles, means an additional work step in the manufacture of lattice girders, additional equipment in automatic production systems, which cannot be fully offset in economic terms by the greatest possible reinforcement steel saving.
  • the object of the invention is therefore to create a lattice girder, the additional bars of the tensile reinforcement which are adapted to the torque profile do not require any adhesive length, the entire lower chord reinforcement lying in the lowest possible level, and all shorter bars being connected to at least one continuous longitudinal bar in a force-transmitting manner, and no additional work step or special additional devices are required for the production of the lattice girder.
  • such a lattice girder has the following features, some of which are known per se: a) the parts of the crossbars assigned to the lower flange are angled parallel to the plane of the lower flange rods,
  • the angled parts of the cross bars run in two sets of straight lines, which are oriented obliquely opposite to the reinforcing bars, and
  • each reinforcement bar of the lower chord is welded to the angled parts of the cross bars on each contact part.
  • the angled parts of the crossbars are preferably in the same plane.
  • the oppositely oblique, angled parts of the cross bars are each arranged in pairs.
  • the crossbars are formed by loop coils, the lower loops of which form the angled parts.
  • each additional bar to the longitudinal reinforcement bar is therefore not made by welding the reinforcement bars directly, but via the angled parts of the cross bars. It has surprisingly been found that a force transmission corresponding to the requirements is also possible if the angled parts of the cross bars are only parallel to the horizontal plane formed by the reinforcement bars Level, especially above the reinforcing bars, are arranged because the vertical components in each path of the flow of force, from the additional bar over the
  • Such welds are repeated along the reinforcement bars at relatively short intervals (approximately every 20 - 25 cm) in accordance with the arrangement of the cross bars.
  • FIG. 1 shows an oblique view of a part of a lattice girder according to the invention
  • FIG. 2 shows an end view of an exemplary embodiment
  • FIGS. 3 and 4 end views of further exemplary embodiments
  • FIGS. 5 and 6 plan views of a section of the lower chord reinforcement of two exemplary embodiments
  • FIG. 7 shows an end view another embodiment.
  • a lattice girder 1 according to the invention has an upper chord formed by at least one longitudinal bar 4, a lower chord formed by at least two reinforcement bars 2, 6 and a row of transverse bars 3 connecting them.
  • the lower chord reinforcement has at least one reinforcement bar 2 which is continuous over the entire length of the lattice girder 1 and which is reinforced by at least one shorter additional bar 6.
  • the length and the arrangement of each additional bar 6 are chosen so that an under-belt reinforcement adapted to the torque curve is formed.
  • the additional rods have no adhesive length, they are at most only slightly longer than required to cover moments if they do not end at a cross bar 3. All reinforcement bars 2, 6 lie in a horizontal plane and are preferably below the angled one.
  • Parts 5 are provided so that the reinforcing bars 2, 6 can be arranged in the concrete component at the lowest possible point.
  • the reinforcing bars 2, 6 touch each other over the entire length and therefore form a flat bundle.
  • the cross bars 3, which are preferably in the form of loop coils (FIGS. 1, 5), have horizontally angled parts 5 on which the reinforcement bars 2, 6 are welded.
  • the angled parts 5 run in two sets of straight lines, which are oriented obliquely to the reinforcing bars, whereby they are advantageously arranged in pairs, but in opposite directions at an angle.
  • the welding points 7 lie at the corner points of a trapezoid, which is torsion-resistant due to the reinforcement of the reinforcing bars 2, 6.
  • the cross bars 3 are preferably formed by loop coils, the lower loops of which are angled and which represent the parts 5.
  • the arrangement of the welding points 7, not shown, can also be provided in a triangle, via the angled parts 5, the tensile forces from the additional bars 6 are transferred to the longitudinal reinforcement bars 2, the force flow being deflected at an obtuse angle in the horizontal.
  • the lattice girder 1 according to FIG. 1 has two bow-shaped coils provided with angled loops as cross bars 3, which connect the two-part lower chord reinforcement to the upper chord. 2, the cross bars 3 can also be formed by individual brackets. In the 3, in which the cross bars 3 are again single brackets or loop coils, three reinforcement bars 2, 6, 6, two of which are additional bars 6, are combined in the lower chord reinforcement.
  • two mutually offset stirrups are preferably also provided as cross bars 3, the angled parts 5 of which point towards one another.
  • the longitudinal reinforcement bar 2 is on the angled parts 5 of all.
  • Cross bars 3 welded, the additional bars 6, however, are only attached to the parts 5 of the cross bars 3 on one side.
  • Fig. 5 shows the top view of angled loops of a bow snake
  • Fig. 6 angled parts of single brackets are shown as cross bars, which are arranged in pairs in opposite directions
  • Fig. 7 finally shows an embodiment in which the cross bars 3 (bow snakes or single brackets ) have angled parts 5 in two parallel planes, the reinforcing bars 2, 6 being arranged between these two planes and running above or below the parts 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

Une barre longitudinale (4) comme membrure superieure, deux barres longitudinales (2) comme membrures inferieures et une barre additionnelle plus courte (6) par barre de membrure inferieure sont reunies au moyen d'entretoises (3) de preference de forme ondulee, en une poutre en treillies. La longueur et la disposition de la barre courte (6) sont adaptees a la courbe des moments. La barre courte (6) est en contact direct avec la barre longue (2) sur toute sa longueur et lui est solidarisee. Toutes les barres de membrure inferieure (2, 6) se trouvent dans un seul plan horizontal et sont soudees a chaque point de contact a des parties pliees parallelement (5) des entretoises (3). Les jonctions soudees ainsi obtenues comprennent des soudures aux angles d'un triangle ou d'un trapeze resistant a la torsion de facon qu'une transmission de force complete soit atteinte. Les parties pliees (5) des entretoises (3) forment deux rangees de droites qui sont alignees, de preference par paires et disposees dans un meme plan et alternativement obliques par rapport aux barres de membrure inferieure (2, 6). Ainsi, les barres de membrure inferieure (2, 6) peuvent rester lisses et n'exigent pas une partie d'adherence.
PCT/AT1981/000031 1980-12-29 1981-12-18 Poutre en treillis WO1982002222A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP50344081A JPS58500418A (ja) 1981-12-18 1981-03-31 金属加工装置のライニング方法
DE8282900001T DE3167760D1 (en) 1980-12-29 1981-12-18 Lattice girder
DE19818138571U DE8138571U1 (de) 1980-12-29 1981-12-18 Gittertraeger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6320/80801229 1980-12-29
AT0632080A AT373012B (de) 1980-12-29 1980-12-29 Gittertraeger fuer die herstellung von stahlbetondecken

Publications (1)

Publication Number Publication Date
WO1982002222A1 true WO1982002222A1 (fr) 1982-07-08

Family

ID=3585112

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1981/000031 WO1982002222A1 (fr) 1980-12-29 1981-12-18 Poutre en treillis

Country Status (7)

Country Link
EP (1) EP0079892B1 (fr)
JP (1) JPS57502008A (fr)
AT (1) AT373012B (fr)
DE (2) DE8138571U1 (fr)
HU (1) HU185499B (fr)
IT (2) IT8123921V0 (fr)
WO (1) WO1982002222A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555222A1 (fr) * 1983-11-17 1985-05-24 Avi Alpenlaendische Vered Armure en etrier pour ouvrages de construction
EP0465776A1 (fr) * 1990-07-12 1992-01-15 BADISCHE DRAHTWERKE GmbH Poutre en treillis
WO1993015287A1 (fr) * 1992-01-31 1993-08-05 Franz Bucher Poutre en treillis
AU700414B1 (en) * 1998-07-21 1999-01-07 Haedong Metal Co., Ltd. Deck panel for reinforced concrete slabs
DE10209046A1 (de) * 2002-03-01 2003-09-18 Badische Drahtwerke Gmbh Bewehrungselement und Verwendung eines Bewehrungselementes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2599929A1 (fr) 2011-12-02 2013-06-05 Intersig NV Support de treillis asymétrique
EP2604768A1 (fr) 2011-12-13 2013-06-19 Intersig NV Poutre triangulée

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1374389A (fr) * 1963-06-26 1964-10-09 Perfectionnement aux armatures de poutrelles
CH488074A (de) * 1967-08-24 1970-03-31 Baustahlgewebe Gmbh Gitterträger für die Bewehrung von vorgefertigten Deckenplatten aus Beton
DE2065433A1 (de) * 1970-11-07 1973-08-09 Gerhard Baisch Bewehrung fuer stahlbeton-bauteile
CH547410A (de) * 1972-11-15 1974-03-29 Baustoff & Handels Ag Deckentraeger.
DE2329943A1 (de) * 1973-06-13 1975-01-09 Rheinbau Gmbh Gittertraeger
AT357313B (de) * 1978-05-08 1980-07-10 Bucher Franz Bewehrungselement
AT359253B (de) * 1979-02-27 1980-10-27 Bucher Franz Bewehrungselement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1374389A (fr) * 1963-06-26 1964-10-09 Perfectionnement aux armatures de poutrelles
CH488074A (de) * 1967-08-24 1970-03-31 Baustahlgewebe Gmbh Gitterträger für die Bewehrung von vorgefertigten Deckenplatten aus Beton
DE2065433A1 (de) * 1970-11-07 1973-08-09 Gerhard Baisch Bewehrung fuer stahlbeton-bauteile
CH547410A (de) * 1972-11-15 1974-03-29 Baustoff & Handels Ag Deckentraeger.
DE2329943A1 (de) * 1973-06-13 1975-01-09 Rheinbau Gmbh Gittertraeger
AT357313B (de) * 1978-05-08 1980-07-10 Bucher Franz Bewehrungselement
AT359253B (de) * 1979-02-27 1980-10-27 Bucher Franz Bewehrungselement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555222A1 (fr) * 1983-11-17 1985-05-24 Avi Alpenlaendische Vered Armure en etrier pour ouvrages de construction
GB2149832A (en) * 1983-11-17 1985-06-19 Avi Alpenlaendische Vered Stirrup basket
EP0465776A1 (fr) * 1990-07-12 1992-01-15 BADISCHE DRAHTWERKE GmbH Poutre en treillis
WO1993015287A1 (fr) * 1992-01-31 1993-08-05 Franz Bucher Poutre en treillis
AU700414B1 (en) * 1998-07-21 1999-01-07 Haedong Metal Co., Ltd. Deck panel for reinforced concrete slabs
DE10209046A1 (de) * 2002-03-01 2003-09-18 Badische Drahtwerke Gmbh Bewehrungselement und Verwendung eines Bewehrungselementes

Also Published As

Publication number Publication date
IT1169296B (it) 1987-05-27
JPS57502008A (fr) 1982-11-11
AT373012B (de) 1983-12-12
EP0079892B1 (fr) 1984-12-12
ATA632080A (de) 1983-04-15
IT8123921V0 (it) 1981-12-29
IT8125887A0 (it) 1981-12-29
DE8138571U1 (de) 1983-05-19
EP0079892A1 (fr) 1983-06-01
DE3167760D1 (en) 1985-01-24
HU185499B (en) 1985-02-28

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