EP0467912B1 - Slab support system - Google Patents

Slab support system Download PDF

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Publication number
EP0467912B1
EP0467912B1 EP90905525A EP90905525A EP0467912B1 EP 0467912 B1 EP0467912 B1 EP 0467912B1 EP 90905525 A EP90905525 A EP 90905525A EP 90905525 A EP90905525 A EP 90905525A EP 0467912 B1 EP0467912 B1 EP 0467912B1
Authority
EP
European Patent Office
Prior art keywords
web
web portions
portions
concrete
edges
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
Application number
EP90905525A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0467912A1 (en
Inventor
Jorma Kyckling
Pertti Levo
Pekka Nykyri
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.)
Deltatek Oy
Original Assignee
Deltatek Oy
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 claimed from FI891772A external-priority patent/FI891772A/fi
Application filed by Deltatek Oy filed Critical Deltatek Oy
Publication of EP0467912A1 publication Critical patent/EP0467912A1/en
Application granted granted Critical
Publication of EP0467912B1 publication Critical patent/EP0467912B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/065—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web with special adaptations for the passage of cables or conduits through the web
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/941—Building elements specially adapted therefor
    • E04B1/943—Building elements specially adapted therefor elongated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/29—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated the prefabricated parts of the beams consisting wholly of metal

Definitions

  • the invention relates to a slab support system comprising a fire-resistant prefabricated steel beam and a plurality of slabs, said beam acting with concrete as a load-bearing jointing structure for said slabs, said beam comprising two web portions and horizontally projecting flange portions extending beyond the web portions.
  • the frame of a prefabricated building is often formed by floor and ceiling structures carried by columns and beams.
  • the beams act as horizontal load-bearing structures, they have to be sufficiently rigid, that is, about 500 to 800 mm high when made of steel concrete.
  • the beams For heat, water, ventilation and electricity installations, the beams have to be perforated or the height of the floor structure has to be increased correspondingly.
  • the high beam structure has been replaced with a lowered beam structure, whereby the web of the beam remains within the floor structure.
  • the height of the lowered beam has been minimized by prestressing, for instance.
  • a jaw beam is more difficult to manufacture than a normal beam, and the minimum thickness of the lowered portion will nevertheless be 100 to 150 mm.
  • Beams are also often manufactured of steel. Steel beams are easier to manufacture than prefabricated concrete beams in addition to which they are light to transport and install. Moreover, steel beams are easier to modify at the working site. As steel beams do not require grouting and are light to displace, they can be installed more rapidly than concrete beams. By adjusting the building to the frame construction timetable, the total building time can be decreased. In case of fire the strength of steel deteriorates with increasing temperature, wherefore a steel beam has to be protected from fire.
  • the fire protection is preferably made by embedding the steel profile in a concrete floor structure whereby the lower flange only has to be protected. The protection is made either by covering the lower flange with a fire-resistant plate, insulation, paint or spray. For reasons of appearance, the piping and the fire protection are often covered with a socalled suspended ceiling.
  • FI Patent Application 882186 A steel beam of such a combined structure is lighter and can be used with longer span lengths than previously.
  • the steel beam of FI Patent Application 882186 requires less welding as the beam is formed by profile parts preformed by hot rolling.
  • the solution of FI Patent Application 882186 is complicated to manufacture because the inserts joining the different materials increase the amount of required welding and the great number of small pieces complicates the manufacture of the beam.
  • Document DE-B-2339638 discloses a shuttering panel made from sheet metal as reinforcement for a concrete floor. This wave-like unit is filled with concrete to form a concrete floor, wherein concrete flowing through openings provided in the unit is catched by an additional plate arranged below the upper flange. A slab support system with a steel beam and a plurality of slabs as mentioned above is not described.
  • the object of the invention is to provide a slab support system which avoids the drawbacks of prior art.
  • This is achieved by a slab support system according to claim 1.
  • This system is characterized in that at least each web portion with its horizontally projecting flange portion is formed by an integral material strip so that the web portion and the projecting flange portion adjoining it form a jointless entity and so that the web portion is in a slanting position with respect to the flange portion, the web portions being arranged side by side so as to slant towards each other and interconnected at edges of said web portions closer to each other by means of a horizontal upper part, and at edges of said web portions farther apart from each other by means of a lower plate welded to the web portions, and openings being formed close to the upper edges of the web portions and/or in the horizontal upper part, the space defined between the upper part of the web portions and the plate being filled with concrete (in a manner known per se).
  • the slab support system of the invention is so designed that its steel parts carry the loads of the slab units during installation.
  • the casing formed by the steel beam and the gap defined between the slabs and the steel profile are filled up in connection with the pouring of concrete into the joints of the slabs.
  • the beam carries the loads exerted on it due to the adhesion between concrete and steel.
  • the beam is also suited for use together with a jointing slab to be cast on site.
  • the slab and the beam can thus be concreted in one step.
  • the beam can be fabricated on an automated line, optimizing the required welding in accordance with the required rigidity.
  • the web portions can be simply perforated to improve adhesion.
  • Projections possibly remaining on the edges or the holes or openings in connection with the perforation improve adhesion between the concrete and the steel.
  • the openings are positioned, for instance, in the upper portion of the slanting web portions, so the grout passes easily inside the beam.
  • the slanting web portions of the beam also enable the slab units to be placed quite close to the bends of the projecting flange portions without hampering the grouting. For this reason, the jaw is strained to a lesser extent than in solutions in which a separate casting space has to be left between the slab unit and the vertical web portion of the beam.
  • the shape advantageous in case of fire and the pouring of concrete into the joints of the floor units wedge the slabs in place, leaving the projecting flanges solely for the installation of the units.
  • the draw flange of the beam, positioned within the profile can be protected from fire in advance in connection with the manufacture of the beam unit without increasing the height of the floor structure.
  • the projecting flanges protect the fire protection layer during transport and installation.
  • the fire protection layer may also be protected from mechanical wear and damages by means of a thin plate attached to the projecting flanges.
  • FIG. 1 is a cross-sectional view of the slab support system of the invention in a situation where slabs rest on the beam and concrete has been poured inside the beam and into the gaps between the beam and the slabs.
  • each web portion 2 with an adjoining horizontally projecting flange portion 1 is made of an integral material strip.
  • the web portions 2 are in a slanted position with respect to the projecting flanges 1.
  • the web portion 2 and the projecting flange portion 1 adjoining it may be formed e.g., by bending from a suitable strip of steel.
  • the two web portions 2 with the projecting flanges 1 are Positioned side by side so that the web portions slant towards each other and are interconnected at the edges closer to each other by means of a horizontal upper part 3.
  • the horizontal upper Part 3 may be formed by a separate material strip, such as a steel strip, which is welded to the upper edges of the web portions.
  • a horizontal steel plate 4 is welded between the edges of the web portions 2 farther apart from each other in such a manner that the plate acts both as a lower mould wall for the concrete 8 to be poured inside the basic profile and as a lower flange bearing the loads of the beam.
  • the plate 4 is Positioned higher than the level of the lower surfaces of the Projecting flanges 1. This arrangement enables the beam to be protected 10 from fire without increasing its structural thickness.
  • Shoulders 12 may be attached to the web portions 2 slanting towards each other.
  • the plate 4 forming the lower flange rests on the shoulders during welding.
  • the slanting web portions are provided with holes or openings 14.
  • the edges of the openings 14 are provided with prodlike or platelike projections 5 at the fabrication stage, for instance.
  • Suspension rods 6 made of steel pass from the upper edge of the beam to the lower edge of the slabs to be supported.
  • the suspension rods increase the ability of the beams to support the slabs together with a wedgelike concrete part 7 formed outside the beam when the beam is being concreted.
  • gripping hooks 18 which efficiently anchor the wedgelike concrete part 7 in position.
  • the steel area of the upper surface can be increased by means of a steel plate 9 or concrete steels welded under or above the upper part of the basic profile. The use of concrete steels improves the adhesive properties.
  • the beam is supported in the middle on structures beneath it before the slabs are placed in position.
  • the middle support is removed after the grouting has gained sufficient strength.
  • the use of support during grouting ensures efficient adhesion, which decreases deflection during and after construction so that the need of cambering is reduced.
  • the support decreases substantially the need of steel on the compression side caused by stresses occurring during installation.
  • Figure 2 shows the beam shown in Figure 1 from the side.
  • the openings in the web portions 2 of the beam are so positioned that no cast cavities are formed under the horizontal upper part 3 of the beam in connection with concreting.
  • the openings 14 are positioned in the web Portions close to the upper edges.
  • the openings 14 may also be used for laying reinforcements for slab fields and pipings for heat, water, ventilation and electricity installations.
  • Figure 3 shows the attachment of the beam shown in Figures 1 and 2 to a vertical supporting structure or column.
  • the end of the beam is so shaped that a beam bracket 11 can be wholly fitted within the beam.
  • the horizontal upper part of the beam forming the upper flange rests on the bracket, and the beam is tightened to the bracket by means of bolts 13 from the side of the beam against the side of the bracket.
  • the tightening can also be carried out by means of installing wedges. This ensures that the beam has sufficient torsional rigidity during installation.
  • Support torque is produced in the jointing beam by providing the bracket with a concrete reinforcement 15 extending through it before the grouting of the joint.
  • the support torque decreases the deformations of the beam and increases the load carrying capacity.
  • An alternative way of producing support torque is shown in Figure 4.
  • Draw-bars 16 are arranged to go through the column. They are fixed to the end of the beam by means of pinching nuts 17. The nuts are tightened through the opening 14 of the web of the beam.
  • Figure 5 shows another embodiment of the beam used in the invention.
  • the grouting of the beam has been carried out at the fabrication stage.
  • the bending capacity of the beam can be increased by a prestressing technique conventionally applied to concrete beams
  • the degree of prestress can be higher than conventionally as the steel profile around the concrete efficiently limits the cleaving of concrete, functioning as a kind of web reinforcement.
  • the horizontal upper part 3 of the beam can be provided with openings or holes 20 through which concrete 21 is poured into the inner space of the beam.
  • the edges of the openings or holes 20 can be provided with projections 22 similar to the projections 5 of the openings 14 described above.
  • the embodiment of Figure 5 is otherwise structurally similar to the embodiment of Figure 1.
  • Figure 6 is a block diagram of the beam production line.
  • the desired shape of the beam is achieved, e.g., by bending thin steel plate. Holes are made by any suitable means in the web portions, for instance.
  • the projections improving the adhesion are also formed at the perforation stage.
  • the parts are sawed into determined dimensions and the beam is cambered according to its span length if desired.
  • the upper part, the possible additional steel of the upper part, and the plate forming the lower flange, which are flame-cut into dimensions, are cambered so as to correspond to the profile in shape.
  • the welding of the additional steels can be carried out easily by means of an automatic welder by submerged arc welding through welding grooves formed in the corners of the steel plates. Beam head details are welded by robot welding. Finally, the beam is coated and protected from fire if required.
  • Figure 7 shows still another embodiment to be used in the invention.
  • the embodiment of Figure 7 differs from that of Figures 1 and 2 in that projecting flange portions 31, web portions 32 and an upper part 33 are formed by an integral basic profile in Figure 7.
  • the basic profile may be formed by a cold-moulded profile, for instance.
  • the projecting flange portions 31, the web portions 32 and the upper part 33 form an integral entity without any joints.
  • the plate forming the lower flange is indicated with the reference numeral 34, the holes with the reference numeral 40, the projections with the reference numeral 42 and the shoulders with the reference numeral 32. Concrete is indicated with the reference numeral 41.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Building Environments (AREA)
  • Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Display Devices Of Pinball Game Machines (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP90905525A 1989-04-13 1990-04-04 Slab support system Expired - Lifetime EP0467912B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FI891772 1989-04-13
FI891772A FI891772A (fi) 1989-04-13 1989-04-13 Brandsaeker foertillverkad staolbalk.
FI900985 1990-02-27
FI900985A FI85745C (fi) 1989-04-13 1990-02-27 Brandsaeker prefabricerad staolbalk
PCT/FI1990/000091 WO1990012173A1 (en) 1989-04-13 1990-04-04 A fire-resistant prefabricated steel beam

Publications (2)

Publication Number Publication Date
EP0467912A1 EP0467912A1 (en) 1992-01-29
EP0467912B1 true EP0467912B1 (en) 1994-06-29

Family

ID=26158541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90905525A Expired - Lifetime EP0467912B1 (en) 1989-04-13 1990-04-04 Slab support system

Country Status (9)

Country Link
EP (1) EP0467912B1 (fi)
KR (1) KR0171608B1 (fi)
AT (1) ATE107990T1 (fi)
AU (1) AU636603B2 (fi)
CA (1) CA2051393C (fi)
DE (1) DE69010326T2 (fi)
FI (1) FI85745C (fi)
MY (1) MY108507A (fi)
WO (1) WO1990012173A1 (fi)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590266A (en) * 1994-10-11 1996-12-31 International Business Machines Corporation Integrity mechanism for data transfer in a windowing system
EP1405961A1 (de) 2002-10-05 2004-04-07 Dywidag-Systems International GmbH Stahl-Verbund-Konstruktion für Geschossdecken
DE202015104628U1 (de) * 2015-09-01 2016-12-05 Pfeifer Holding Gmbh & Co. Kg Tragbalken für Deckensysteme und Deckensystem

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI92089C (fi) * 1993-01-13 1994-09-26 Deltatek Oy Esivalmistettu teräs-betoni-liittopalkki
FI930696A (fi) * 1993-02-17 1994-08-18 Deltatek Oy Esivalmistettu teräs-betoni-liittopalkki
DE29719057U1 (de) * 1997-10-27 1997-12-11 Menke, Gerhard, 59955 Winterberg Säulenartiges Betonfertigteil
US6442908B1 (en) * 2000-04-26 2002-09-03 Peter A. Naccarato Open web dissymmetric beam construction
WO2002075068A1 (fr) * 2001-03-19 2002-09-26 Obschestvo S Ogranichennoi Otvetstvennostju 'profil Xxi Vek' Poutre profilee des travaux de betonnage
FI112817B (fi) * 2001-07-02 2004-01-15 Ekobalk Oy Rakennuspalkkijärjestelmä
NL1020608C2 (nl) * 2002-05-16 2003-11-18 Constructiewerkplaats G C Gr N Systeem omvattende althans in hoofdzaak stalen liggers, in het bijzonder ten behoeve van de staal- en/of betonskeletbouw.
FI118816B (fi) 2002-05-29 2008-03-31 Teraespeikko Oy Menetelmä ja väline teräspalkin valmistamiseksi
FI119196B (fi) * 2002-05-29 2008-08-29 Peikko Finland Oy Teräspalkki
FI20021934A (fi) * 2002-10-31 2004-07-16 Tartuntamarkkinointi Oy Liittopalkki
FI5914U1 (fi) * 2003-04-10 2003-08-25 Teraespeikko Oy Teräspalkki
ES2220236B1 (es) * 2004-06-24 2005-07-01 Hormigones Prefabricados De España, S.A. "estructura de edificio multiplanta".
DE202004018655U1 (de) 2004-12-02 2005-04-21 Velthorst Beheer B.V. Stahlverbundträger mit brandgeschütztem Auflager für Deckenelemente
FI20060543L (fi) * 2006-06-02 2007-12-03 Rautaruukki Oyj Teräslevypalkki ja sen valmistusmenetelmä
ES2369678B1 (es) * 2009-07-07 2012-06-19 Idoc Ingenieros S.L. Viga en carga para forjados planos.
FI20145669A (fi) 2014-07-11 2016-01-12 Peikko Group Oy Teräspalkki
FI11529U1 (fi) 2017-01-16 2017-01-30 Anstar Oy Ontelolaatan kannake
ES2681568A1 (es) * 2018-05-23 2018-09-13 Universitat Politècnica De València Viga plana con resistencia al fuego mejorada para forjados de acero-hormigón y su procedimiento de fabricación
SE543184C2 (sv) * 2019-02-14 2020-10-20 Vaestsvenska Staalkonstruktioner Ab Brandsäker bjälklagsbalk av stål med vertikala liv, horisontella flänsar och ett värmeisolerande material i ett utrymme mellan flänsarna
ES2783890A1 (es) * 2020-06-04 2020-09-18 Univ Valencia Politecnica Viga en cajon mixta acero-hormigon
SE546101C2 (sv) * 2022-05-30 2024-05-21 Svensson Nils Gustav Balk av stål avsedd att tillsammans med betong forma ett bjälklag

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397497A (en) * 1966-11-28 1968-08-20 Inland Steel Products Company Deck system
DE2339638C3 (de) * 1973-08-04 1979-02-22 Walter Dr.-Ing. 6101 Rossdorf Sowa Als Bewehrung für eine Betonverbunddecke dienende Schalungsplatte aus Blech
DE2431913A1 (de) * 1974-07-03 1976-01-22 Walter Dr Ing Sowa Profilblechplatte fuer betonverbunddecken
CH582801A5 (fi) * 1973-08-04 1976-12-15 Sowa Walter
SE457364B (sv) * 1987-05-11 1988-12-19 Joergen Thor Brandmotstaandskraftig bjaelklagsbalk av staal i samverkan med betong

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590266A (en) * 1994-10-11 1996-12-31 International Business Machines Corporation Integrity mechanism for data transfer in a windowing system
EP1405961A1 (de) 2002-10-05 2004-04-07 Dywidag-Systems International GmbH Stahl-Verbund-Konstruktion für Geschossdecken
DE202015104628U1 (de) * 2015-09-01 2016-12-05 Pfeifer Holding Gmbh & Co. Kg Tragbalken für Deckensysteme und Deckensystem

Also Published As

Publication number Publication date
FI85745B (fi) 1992-02-14
AU5359990A (en) 1990-11-05
KR0171608B1 (ko) 1999-02-18
FI900985A0 (fi) 1990-02-27
DE69010326T2 (de) 1994-10-20
WO1990012173A1 (en) 1990-10-18
FI85745C (fi) 1993-02-23
CA2051393C (en) 1995-09-05
AU636603B2 (en) 1993-05-06
KR920701595A (ko) 1992-08-12
DE69010326D1 (de) 1994-08-04
ATE107990T1 (de) 1994-07-15
CA2051393A1 (en) 1990-10-14
EP0467912A1 (en) 1992-01-29
MY108507A (en) 1996-10-31

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