US3283466A - Rigid lattice girder for floors - Google Patents

Rigid lattice girder for floors Download PDF

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Publication number
US3283466A
US3283466A US359269A US35926964A US3283466A US 3283466 A US3283466 A US 3283466A US 359269 A US359269 A US 359269A US 35926964 A US35926964 A US 35926964A US 3283466 A US3283466 A US 3283466A
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United States
Prior art keywords
chord
girder
slab
yokes
elongation
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Expired - Lifetime
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US359269A
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English (en)
Inventor
Grebner Fritz
Kolsch Wilhelm
Spindler Gerhard
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/18—Spacers of metal or substantially of metal
    • 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

Definitions

  • the present invention relates to rigid lattice girders for floors, and more particularly to lattice girders whose lower chord means is embedded in a concrete slab which may serve as a form for pouring concrete to produce a reinforced concrete floor.
  • this invention proposes to use a precast concrete slab about the lower chord means of a reinforcing lattice girder as a form for pouring concrete floors about the girder.
  • the girder has strut means consisting of a plurality of yokes extending transversely of the girder chord means and being diagonally inclined in relation thereto, as is known, but to provide each yoke with an asymmetrical transverse extension adjacent the lower chord means.
  • alternating yokes are so arranged in the direction of elongation of the concrete slab that the yoke extensions are on alternating sides of the upper chord in a transverse direction.
  • laterally extending yoke extensions provide sufficient reinforcement for lateral portions of the concrete slab and make it possible to widen these elongated slabs so that the slabs themselves may serve as the forms and replace the previously used separate plate forms.
  • elongated slabs having rein-forcing girders embedded the-rein may be placed side by side to provide a floor or ceiling form for the concrete pouring. This not only saves the extra form plates but also makes it possible to use the precast concrete slab form as part of the supporting structure since such reinforced slabs are load-supporting.
  • the asymmetrical and alternating arrangement of the laterally extending slab reinforcing yoke extensions use only as much structural steel as is actually needed for static purposes.
  • FIG. 1 is a top view of the lattice girder of the present invention showing its essential elements without the concrete slab;
  • FIG. 2 is a transverse section of the lattice girder of FIG. 1, with the concrete slab;
  • FIG. 3 is a perspective view of a connecting member useful in the girder of this invention.
  • the lattice girder is shown to comprise an elongated concrete slab 7 and a lower chord means embedded in the concrete slab and extending in the direction of elongation of the slab.
  • the illustrated lower chord means consists of two like pairs of lower chords, each pair consisting of an inner chord 1 and an outer chord 2.
  • An upper chord 3 is spaced from the lower chord means and is generally parallel thereto.
  • the upper chord is arranged centrally of the lower chord means, i.e. centrally of the inner chords 1, 1, in the direction of elongation of the slab 7.
  • the lower chord means and the upper chord are connected by strut means, preferably by spot welding the metal elements 1, 2, 3, 4 together at their points of contact, as is well known in this art.
  • the strut means consists of a plurality of yokes 4. Each yoke extends transversely of the girder chord means and is diagonally inclined in relation thereto.
  • each yoke has an asymmetrical transverse extension 5 adjacent the lower chord means and alternating ones of the yokes are so arranged in the direction of elongation of the slab that the asymmetrical yoke extensions are on alternating sides of the upper chord in a transverse direction.
  • each yoke includes a generally V-shap-ed portion having an apex connected, i.e. by spot welding, to the upper c'hord 3 and two transverse extensions 5, 50 connected to the lower chord means, the asymmetrical extensions 5 being substantially longer than the extensions 5a.
  • the shorter extensions 5a are adjacent the inner chord 1 of one pair of the lower chords and the asymmetrical longer extensions 5 are adjacent the inner and outer chords of the other pair of lower chords.
  • the V-s-haped yoke portions of adjacent yokes are oppositely inclined whereby pairs of yokes with the V-shaped portions thereof inclined towards each other are arranged in the direction of elongation of the concrete slab 7. The alternating arrangement of the yokes always places a short extension 5a and a long extension 5 adjacent one another.
  • the lower chord means 1, 2 and the yoke extensions 5, 5a extend at least approximately in the horizontal center plane 6 of concrete slab 7 to provide the most effective reinforcement therefor.
  • the alternating arrangement of the extensions 5, in conjunction with the outer chords 2, provide suflicient reinforcement for the portions of concrete slabs 7 extending laterally beyond the inner chords 1 of the lattice girder to ensure rigidity of the slab under the load conditions imposed thereon under normal operations contemplated therefor while using up no more reinforcing steel than is absolutely required. Therefore, while such a girder meets all structural requirements, it is very economical in the use of steel.
  • a transverse connecting member 8 is mounted on the lower chord means between adjacent yokes, i.e. between the transverse extensions 5, 5a of the yokes.
  • the connecting member 8 has perpendicularly bent end portions 9 functioning as spacers between adjacent yoke extensions 5 and 5a, and embedded in the concrete before the same is set about the lower chord means.
  • a central part 12 of the end portions 9 is cut out and bent inwardly to form an arcuate element encircling the chords 1, 1 and holding these chords in position so that they are clamped together by the connecting member 8.
  • the member 8 has two arcnate portions 10a cooperating with similarly arcuate cut-out elements 10, each of theconnecting member .portions 10, 10a cooperating to encircle elongated reinforcing rods 11 extending in the direction of elongation of the slab and serving as auxiliary reinforcements therefor.
  • a rigid lattice girder for floors comprising an elongated concrete slab, a lower girder chord means embedded in the concrete slab and extending in the direction of elongation of the slab, an upper girder chord spaced from the lower chord means and generally parallel thereto,
  • the upper chord being arranged centrally of the lower chord means in the direction of elongation of the slab and strut means connecting the lower chord means and the upper chord, the strut means consisting of a plurality of yokes extending transversely of the girder chord means and being diagonally inclined in relation thereto, each yoke having an asymmetrical transverse extension adjacent the lower chord means, and alternating ones of said yokes being so arranged in the direction of elongation of the slab that the yoke extensions are on alternating sides of the upper chord in a transverse direction.
  • each yoke includes a generally V-shaped-portion having an apex connected to the upper chord and two transverse extensions connected to the lower chord means, the asymmetrical tone of said extensions being substantially longer than the other extension-the V-shaped yoke portions of adjacent ones of said yokes being oppositely diagonally inclined whereby pairs of said yokes with the V-shaped portions thereof inclined towards each other are arranged in the direction of elongation of said slab.
  • each yoke includes a generally V-shalped portion having an apex connected to the apper chord and two transverse extensions, a shorter one of said extensions being adjacent the inner chord of one of said pairs of lower chords and the asymmetrical one of said extensions being adjacent the inner and outer chords of the other one of said pairs of lower chords.
  • the rigid lattice girder of claim 1 further comp-rising a transverse connecting member mounted on the lower chord means between adjacent ones of said yokes, said connecting member maintaining the spacing of the adjacent yokes and including means for securing longitudinally extending reinforcing elements for the concrete slab.
  • FRANK L. ABBOTT Primary Examiner.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Bridges Or Land Bridges (AREA)
US359269A 1963-05-07 1964-04-13 Rigid lattice girder for floors Expired - Lifetime US3283466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER0035108 1963-05-07

Publications (1)

Publication Number Publication Date
US3283466A true US3283466A (en) 1966-11-08

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US359269A Expired - Lifetime US3283466A (en) 1963-05-07 1964-04-13 Rigid lattice girder for floors

Country Status (4)

Country Link
US (1) US3283466A (de)
CH (1) CH406586A (de)
GB (1) GB1012465A (de)
LU (1) LU45066A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763613A (en) * 1970-01-14 1973-10-09 H Wise Composite concrete construction of two-way slabs and flat slabs
US4050213A (en) * 1970-01-12 1977-09-27 Thomas J. Dillon & Co., Inc. Method of erecting a multi-story building
US9340975B2 (en) * 2012-05-08 2016-05-17 Kunshan Ecological Building Technology Co., Ltd. Method of casting in-situ ferrocement ribbed slab with spliced rack and suspended formwork
US12509882B2 (en) * 2023-01-26 2025-12-30 Som Iw Holdings, Llc Timber-concrete composite connector and ductile reinforcement chair

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US992994A (en) * 1910-03-04 1911-05-23 Clinton Wire Cloth Company Reinforced i-beam.
US1365126A (en) * 1921-01-11 Chair and spacer
US1620501A (en) * 1926-09-15 1927-03-08 Vogel Reinhold Concrete-reenforcing-rod chair
DE831764C (de) * 1948-12-14 1952-02-18 Karl August Stangier Fa Stahlbeton-I-Traeger und Verfahren zu seiner Herstellung
GB786204A (en) * 1954-11-01 1957-11-13 Harold Desmond Robert Ridgeon Improvements in or relating to reinforced concrete beams
FR1219125A (fr) * 1958-09-15 1960-05-16 Poutre préfabriquée à treillis métallique avec base en terre cuite ou en agglomérat de ciment pour la construction de planchers plats, inclinés, en voûte ou similaires, et planchers construits avec cette poutre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1365126A (en) * 1921-01-11 Chair and spacer
US992994A (en) * 1910-03-04 1911-05-23 Clinton Wire Cloth Company Reinforced i-beam.
US1620501A (en) * 1926-09-15 1927-03-08 Vogel Reinhold Concrete-reenforcing-rod chair
DE831764C (de) * 1948-12-14 1952-02-18 Karl August Stangier Fa Stahlbeton-I-Traeger und Verfahren zu seiner Herstellung
GB786204A (en) * 1954-11-01 1957-11-13 Harold Desmond Robert Ridgeon Improvements in or relating to reinforced concrete beams
FR1219125A (fr) * 1958-09-15 1960-05-16 Poutre préfabriquée à treillis métallique avec base en terre cuite ou en agglomérat de ciment pour la construction de planchers plats, inclinés, en voûte ou similaires, et planchers construits avec cette poutre

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050213A (en) * 1970-01-12 1977-09-27 Thomas J. Dillon & Co., Inc. Method of erecting a multi-story building
US3763613A (en) * 1970-01-14 1973-10-09 H Wise Composite concrete construction of two-way slabs and flat slabs
US9340975B2 (en) * 2012-05-08 2016-05-17 Kunshan Ecological Building Technology Co., Ltd. Method of casting in-situ ferrocement ribbed slab with spliced rack and suspended formwork
US12509882B2 (en) * 2023-01-26 2025-12-30 Som Iw Holdings, Llc Timber-concrete composite connector and ductile reinforcement chair

Also Published As

Publication number Publication date
GB1012465A (en) 1965-12-08
LU45066A1 (de) 1964-02-20
CH406586A (de) 1966-01-31

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