EP0027832A1 - Poutre en treillis tridimensionelle - Google Patents

Poutre en treillis tridimensionelle Download PDF

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Publication number
EP0027832A1
EP0027832A1 EP79104219A EP79104219A EP0027832A1 EP 0027832 A1 EP0027832 A1 EP 0027832A1 EP 79104219 A EP79104219 A EP 79104219A EP 79104219 A EP79104219 A EP 79104219A EP 0027832 A1 EP0027832 A1 EP 0027832A1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
metal rail
lattice girder
concrete
side walls
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
EP79104219A
Other languages
German (de)
English (en)
Other versions
EP0027832B1 (fr
Inventor
Peter Dr. Schiessl
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.)
Cessione kaiser - Omnia Bausysteme Vetriebsgesells
Original Assignee
Kaiser-Omnia Bausysteme & Co GmbH
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 Kaiser-Omnia Bausysteme & Co GmbH filed Critical Kaiser-Omnia Bausysteme & Co GmbH
Priority to EP79104219A priority Critical patent/EP0027832B1/fr
Priority to AT79104219T priority patent/ATE2453T1/de
Priority to DE7979104219T priority patent/DE2964741D1/de
Priority to NO801928A priority patent/NO801928L/no
Publication of EP0027832A1 publication Critical patent/EP0027832A1/fr
Application granted granted Critical
Publication of EP0027832B1 publication Critical patent/EP0027832B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a spatial lattice girder with an upper chord, designed as an upwardly open sheet metal rail with a bottom and with side walls for receiving concrete, on the side walls of which diagonals are welded from the outside, which connect the upper chord to a lower chord bar.
  • Such a spatial lattice girder is described in DE-PS 2 427 168.
  • the trough-shaped sheet metal rail is smooth.
  • the free edge sections of the side walls of the sheet metal rail are first widened outwards and then drawn inwards.
  • the side walls of the sheet metal rail taper upwards, so that the diagonals are spread apart in an end view of the lattice girder.
  • this lattice girder To produce this lattice girder, a welding electrode is inserted into the sheet metal rail, which completely fills its free cross section.
  • the distance between the upper edges of the sheet metal rail is there in the order of 1 to 2 cm.
  • this has the disadvantage that only a concrete with fine-grained aggregates and a relatively large amount of water can be poured into this very narrow sheet metal rail.
  • such concrete is characterized by a relatively large shrinkage when setting. Because the walls of the sheet metal rail are smooth in the longitudinal direction, there is therefore a risk that the set concrete rod will come loose from the bond with the sheet metal rail with only slight loads. Because of the poor bond between sheet metal rail and concrete and the small concrete cross section in the In the top chord, the mounting span on this lattice girder is only slightly increased by the concrete filling.
  • CH-PS 391 245 describes a similar spatial lattice girder.
  • a diagonal is welded there to the bottom of a sheet metal rail.
  • This lattice girder is therefore not sufficiently stiffened in the lateral direction, so that no larger spans can be achieved with loads in the direction of its height.
  • the substantially U-shaped profiled sheet metal rail has waves on its inner surface which are intended to increase the surface area and thus to increase the bond strength with a pressure-resistant material inserted into the sheet metal rail.
  • Profiling of the sheet metal rail is recommended there in such a way that the side flanks of the sheet metal rail run back approximately semicircularly into the interior of the sheet metal rail.
  • DE-OS 2 446 733 describes a composite ceiling consisting of a tension belt consisting of steel and also serving as formwork and a pressure belt consisting of concrete.
  • a tension belt consisting of steel
  • a pressure belt consisting of concrete.
  • the surfaces of the steel plates facing the concrete are provided with knobs. These knobs thus serve to improve the bond in the area of a tension element of a continuous rib ceiling.
  • the object of the invention is to further develop it in such a way that the mounting span is significantly improved by improving the bond between the sheet metal rail and the concrete inserted and solidified into the sheet metal rail under loads in all directions.
  • the invention is characterized in that the sheet metal rail is provided over its length with spaced projections, and that the distance between the upper edges of the sheet metal rail is so large that a concrete with additives of conventional grain sizes are entered into the sheet metal rail can.
  • the volume of the concrete entered into the sheet metal rail is considerably increased in all directions.
  • the result is a spatial lattice girder, the stability and compressive strength of which is considerably increased in all directions in the upper chord area, by an inexpensive material, namely concrete.
  • a prerequisite for increased stability is the bond between sheet metal rail and concrete that goes beyond mere adhesion. This requirement is created by the projections, which are distributed over the length of the sheet metal rail and which continuously absorb the shear forces between the concrete and the sheet metal rail. This makes it possible to fully utilize the load-bearing capacity of the composite body.
  • the distance between the upper edges of the sheet metal rail should be of the order of at least 8 cm, so that a concrete with additives of conventional grain sizes can be entered.
  • the side walls of the sheet metal rail are inclined in a manner known per se to the interior of the sheet metal rail and their upper edges are angled inwards. This also improves the bond between the concrete and the sheet metal rail when the load is applied in the vertical direction. So that the shear-resistant bond achieved by the specified measures is retained even with larger loads, a certain kink resistance must be ensured for the sheet metal rail.
  • the bottom of the sheet metal rail has a continuous bead in the longitudinal direction. The bending of the sheet metal rail serves the same purpose.
  • the projections can be designed in several ways, for example as tongues or knobs. It is preferred if the projections are designed as knobs pointing into the interior of the sheet metal rail, as is known per se, because this results in high shear areas on the knobs.
  • An upper chord 1 consists of a support-shaped sheet metal rail with a bottom 2 and side walls 3. Diagonals 4 are welded to the outer sides of the side walls 3. In the exemplary embodiment shown, these are wave-shaped, as can best be seen in FIG. 2. In the area of the lower ends of the diagonals, lower chord rods 5 are welded to the diagonals.
  • the bottom 2 and the side walls 3 of the upper flange have knobs 6 which are arranged at intervals from one another and point into the interior of the sheet metal rail.
  • the clear distance 7 between the upper edges 8 of the side walls 3 of the upper chord is of the order of at least 8 cm.
  • a concrete 9 with additives of usual grain sizes is entered into the sheet metal rail.
  • the sheet metal rail can also have bevels 10 on the upper edges of the side walls 3, in the base 2 a continuous bead 11 in the longitudinal direction or other conventional stiffeners in the longitudinal and / or transverse direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Rod-Shaped Construction Members (AREA)
EP79104219A 1979-10-30 1979-10-30 Poutre en treillis tridimensionelle Expired EP0027832B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP79104219A EP0027832B1 (fr) 1979-10-30 1979-10-30 Poutre en treillis tridimensionelle
AT79104219T ATE2453T1 (de) 1979-10-30 1979-10-30 Raeumlicher gittertraeger.
DE7979104219T DE2964741D1 (en) 1979-10-30 1979-10-30 Three-dimensional lattice girder
NO801928A NO801928L (no) 1979-10-30 1980-06-27 Tredimensjonal gitterbjelke.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79104219A EP0027832B1 (fr) 1979-10-30 1979-10-30 Poutre en treillis tridimensionelle

Publications (2)

Publication Number Publication Date
EP0027832A1 true EP0027832A1 (fr) 1981-05-06
EP0027832B1 EP0027832B1 (fr) 1983-02-09

Family

ID=8186225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104219A Expired EP0027832B1 (fr) 1979-10-30 1979-10-30 Poutre en treillis tridimensionelle

Country Status (3)

Country Link
EP (1) EP0027832B1 (fr)
AT (1) ATE2453T1 (fr)
DE (1) DE2964741D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669243A (en) * 1985-11-06 1987-06-02 Truswal Systems Corporation Fire protective system and method for a support structure
CN102216540B (zh) * 2008-11-19 2013-10-23 科比亚克斯技术股份公司 预应力板元件

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1900767U (de) * 1960-11-14 1964-09-17 Jacques Werman Gurtbautraeger aus eisenbeton.
CH391245A (de) * 1960-08-27 1965-04-30 Bautechnik Anstalt Träger, insbesondere für Bauzwecke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH391245A (de) * 1960-08-27 1965-04-30 Bautechnik Anstalt Träger, insbesondere für Bauzwecke
DE1900767U (de) * 1960-11-14 1964-09-17 Jacques Werman Gurtbautraeger aus eisenbeton.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4669243A (en) * 1985-11-06 1987-06-02 Truswal Systems Corporation Fire protective system and method for a support structure
CN102216540B (zh) * 2008-11-19 2013-10-23 科比亚克斯技术股份公司 预应力板元件

Also Published As

Publication number Publication date
EP0027832B1 (fr) 1983-02-09
DE2964741D1 (en) 1983-03-17
ATE2453T1 (de) 1983-03-15

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