US3800491A - Ribbed concrete slab - Google Patents

Ribbed concrete slab Download PDF

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Publication number
US3800491A
US3800491A US00201811A US3800491DA US3800491A US 3800491 A US3800491 A US 3800491A US 00201811 A US00201811 A US 00201811A US 3800491D A US3800491D A US 3800491DA US 3800491 A US3800491 A US 3800491A
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United States
Prior art keywords
slab
rib
concrete slab
ribbed
cantilevered beam
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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
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US00201811A
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English (en)
Inventor
K Gunia
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Fried Remy Nachfolger KG
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Fried Remy Nachfolger KG
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    • 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
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • 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
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
    • 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
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
    • E04B5/046—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement with beams placed with distance from another
    • 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
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
    • E04B5/06—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement with beams placed against one another optionally with pointing-mortar
    • 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
    • E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors

Definitions

  • a ribbed slab with this additional reinforcement is also inadequate from static considerations, because the main reinforcement consists solely of a round steel stirrup bent into a U-shape, which is arranged in the bearing in such a way that the one arm of the said stirrup extends into the slab, whereas the other stirrup arm is bent obliquely downwards from the bearing and its end is arranged in the lower part of the rib.
  • this bearing reinforcement has an inadequate load bearing capacity, so that cracking or fracture occurs at the bearing in the case of fairly long ribbed concrete slabs or under fairly high loads.
  • the additional bearing reinforcement of which according to the invention comprises one or a plurality of straight cantilever beams arranged in the slab in its Iongitudinal direction and at least one tie rod arranged in proximity of the end of the rib, which is arranged in a plane oriented perpendicularly to the cantilever beams and which connects the cantilever beams tensionally to the lower longitudinal reinforcement of the rib.
  • FIG. 1 shows in plan a ribbed slab with slab reinforcement and bearing reinforcement
  • FIG. 2 shows a longitudinal section taken along the line ll/Il of FIG. 1;
  • FIG. 3 shows a cross section along the III/III of FIG.
  • FIG. 4 shows a cross section along the line IV/IV of FIG.1;
  • FIGS. 5 to 7 show another embodiment of the bearing reinforcement of a ribbed concrete slab illustrated similarly to FIGS. 1 to 3;
  • FIG. 8 shows a third embodiment in cross section (according to FIG. 3);
  • FIG. 9 the bearing reinforcement of a Pi-shaped slab
  • FIG. 10 shows a truss with bearing and bearing reinforcement according to the invention.
  • FIGS. 1 to 4, and also 5 to 7, illustrate a ribbed slab having an L-shaped cross section which comprises a slab l and a rib 2 which is arranged at one longitudinal side of the slab. On this longitudinal side the slab also has a recess 3 which serves (see FIG. 4) for the purpose of placing the said ribbed slabs together and mutually bracing them. Ribbed slabs of this type are used as floor slabs or roof slabs.
  • the slabs 1 are also (see FIGS. 1 2, 5, 6) prolonged beyond both the rib ends 4 in order to form a bearing 5 arranged at each of the end faces of the slab.
  • the ribbed slab is supported by the said bearing upon a truss 6.
  • an additional reinforcement is provided in the ribbed slab, comprising one or a plurality of cantilever beams 7a to 7d (FIGS. 1 to 3) or 8a, 8b (FIGS.
  • the cantilever beams 7a to 7d consist of strip steel, and in fact advantageously of a single, multiply bent steel strip placed on edge which has a plurality of horizontal ribs 12 stamped out of the said steel strip. These ribs are provided for the purpose of better absorption of the shear forces between concrete and steel strip and to achieve a more intimate .connection between the concrete and the cantilever beams.
  • the tie rods 9a, 9b are constructed as a stirrup (see FIG. 3) which embraces the rib reinforcement 11.
  • the arm ends 13 may be made hook shaped so that they rest upon the cantilever beams 7 and thus connect the said cantilever beams tensionally to the rib reinforcements 11.
  • the length 1 of the cantilever beams 7 or 8 present in the slab l is equal to three or four times the length l, of the cantilever arm present in the bearing 5.
  • a known filigree beam is provided as reinforcement of the rib 2, and comprises the longitudinal reinforcement 11 (bottom flange), a top flange (l4) and a zig-zag shaped round steel bar 15, these parts of the beam being attached to each other by welding.
  • Longitudinal reinforcements l6 and transverse reinforcements 17 are provided for the bay reinforcement of the slab 1.
  • the cantilever beams arranged in this slab 1 consist of U-shaped profiles 8a, 8b, which are conveniently arranged in pairs, and the tie rods 10a, 10b consist of strip steel stirrups, the ends 18 of which are inserted between the U-shaped profiles 8a, 8b and are attached to the webs of the said U-shaped profiles by welding.
  • These U-shaped profiles in the arrangement illustrated have a high moment of resistance in proportion to the material outlay, so that the flexural forces indicated by the arrow A (FIG. 6) which occur at the bearing are effectively absorbed.
  • the two tie rods 10a, 10b may advantageously be further mutually connected by diagonal tension members 19, as indicated by chain dotted lines in FIG. 6.
  • the previously described filigree beam may be provided as rib reinforcement.
  • other profiles e.g. Z-shaped profiles may also be provided.
  • FIG. 8 illustrates that, if desired, it is also possible for only a single cantilever beam e.g. constructed as a U-shaped profile to be provided in the slab 1.
  • the tie rod which connects the said cantilever beam to the rib reinforcements 11 may also be constructed, as illustrated, as a loop 21 which wraps both the cantilever beam 20 and also the reinforcement 11.
  • FIG. 9 illustrates that the additional bearing reinforcement according to the invention may also be provided in the case of a Pi-shaped slab which comprises a slab 22 and the two longitudinal ribs 23.
  • the end faces of the slab 22 protrude beyond the ends 24 of the ribs and form a bearing 25 for supporting the said Pishaped slab on a truss.
  • the additional bearing reinforcement consists of the U-shaped profiles 26 provided as cantilever beams, which are tensionally connected to the rib reinforcements l l by tie rods 10a, 10b in the sense of the embodiment previously described (FIGS. 5 to 7).
  • FIG. 10 illustrates that the invention is also applicable in the case of reinforced concrete trusses, the top flange 27 of which protrudes beyond the web end 23 of the said truss and forms a projecting bearing at 29.
  • cantilever beams consisting of U-shaped profiles 30 or the like are provided arranged in the top flange 27 and extending into the bearing 29, and are tensionally attached to the web reinforcements 31 by tie rods 10a, 10b.
  • the bearing reinforcement according to the invention produces high load bearing capacity for a minimum material outlay. It also has the advantage that the novel bearing reinforcement constitutes a unit connected by welding etc. which can be maintained in the correct position without difficulty and satisfactorily during the pouring of the ribbed slab.
  • the novel bearing reinforcement also makes possible an ideal absorption of the shear forces within the bearing, since the total cross section of the cantilever beams is present in every sectional position.
  • the cantilever beams are conveniently firmly attached together in the horizontal direction by transverse steel members 32, as illustrated by way of example in FIGS. 5, 6.
  • U- profile cantilever beams 8a, 8b of 40 X 20 mm and with a length of 400 mm may be provided as additional bearing reinforcement, and steel strips of 30 X 3 mm may be provided for the tie rods 10a, 10b.
  • the bearing 5 protrudes by the dimension a of approximately mm beyond the rib end face 4, while the rib 2 has a height h of 210 mm.
  • At least one cantilever portion on said concrete slab extending in the longitudinal direction beyond the end of said rib to define a cantilever bearing structure at said end and adapted to engage and rest on a truss member;
  • reinforcing means consisting of at least one elongated cantilevered beam embedded in said slab and having a longitudinal axis parallel to said longitudinal axis of said concrete slab and a longitudinal part extending into said cantilever bearing structure, said cantilevered beam consisting of a single multiple bent steel strip placed on edge and having a plurality of horizontal ribs punched out from said steel strip, at least one elongated reinforcement member positioned in said rib below and parallel to said cantilevered beam and at least one tie rod adjacent said end of said rib and connecting said cantilevered beam to said reinforcement member, said tie rod lying in a plane generally perpendicular to said longitudinal direction of said cantilevered beam.
  • At least one cantilever portion on said concrete slab extending in the longitudinal direction beyond the end of said rib to define a cantilever bearing structure at said end and adapted to engage and rest on a truss member; reinforcing means consisting of at least one elongated cantilevered beam embedded in said slab and having a longitudinal axis parallel to said longitudinal axis of said concrete slab and a longitudinal part extending into said cantilever bearing structure, said cantilevered beam consisting of a beam member having means thereon defining at least a pair of connected and opposed vertically upstanding laterally facing wall surfaces extending parallel to said longitudinal axis of said concrete slab and adapted to specifically resist deflections of said beam member at least about an axis perpendicular to said wall surfaces, at least one elongated reinforcement member positioned in said rib below and parallel to said cantilevered beam and at least one tie rod adjacent said end of said rib and connecting said cantilevered beam to said reinforcement member, said tie rod lying in a plane generally perpendicular
  • a ribbed slab according to claim 2 wherein the length (1 of said beam member in the slab is in the strip which is connected to the webs of said one of said U-shaped and Z-shaped profiles by welding.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Reinforcement Elements For Buildings (AREA)
US00201811A 1970-11-28 1971-11-24 Ribbed concrete slab Expired - Lifetime US3800491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702058714 DE2058714A1 (de) 1970-11-28 1970-11-28 Betonrippenplatte

Publications (1)

Publication Number Publication Date
US3800491A true US3800491A (en) 1974-04-02

Family

ID=5789425

Family Applications (1)

Application Number Title Priority Date Filing Date
US00201811A Expired - Lifetime US3800491A (en) 1970-11-28 1971-11-24 Ribbed concrete slab

Country Status (8)

Country Link
US (1) US3800491A (xx)
BE (1) BE774213A (xx)
CH (1) CH544856A (xx)
DE (1) DE2058714A1 (xx)
FR (1) FR2115284B3 (xx)
GB (1) GB1366518A (xx)
IT (1) IT942976B (xx)
NL (1) NL7116159A (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067166A (en) * 1975-06-12 1978-01-10 Sheahan Edmund C Retaining block
US4612751A (en) * 1985-07-09 1986-09-23 Dur-O-Wal, Inc. Dapped end reinforcement assembly for precast prestressed concrete members
EP0923857B1 (en) * 1997-12-15 2002-04-24 Johannes Hermanus C. H. Swaans Pen floor for livestock pens, for pigsties in particular, including floor panel and transverse beam to be incorporated in the pen floor
EP2166171A1 (de) * 2008-09-23 2010-03-24 Ancotech Ag Anordnung zum Bewehren eines Betonbauwerkes gegen Durchstanzen im Bereich der Auflage eines Deckenelementes auf einer Stütze sowie Durchstantbewehrungselement hierfür
KR100974672B1 (ko) * 2008-01-28 2010-08-06 이승재 절곡강판을 이용하여 댑단부가 보강된 피씨 보
US20150292193A1 (en) * 2009-07-08 2015-10-15 Housh Rahimzadeh Building Structure Including Balcony
US20220049495A1 (en) * 2018-09-10 2022-02-17 Hcsl Pty Ltd Building panel
WO2022154671A1 (en) * 2021-01-12 2022-07-21 Ogs Seed As A building element of prefabricated concrete

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101340C2 (de) * 1981-01-17 1983-04-28 Karl Bachl Ziegel- und Betonwerke, 8391 Deching Stahlbetonfertigteil, insbesondere für Deckenplatten
FR2578276B1 (fr) * 1985-03-01 1988-06-03 Rech Etudes Tech Element de construction en beton, notamment element de plancher, et procede pour sa fabrication
EP0685608B1 (de) * 1994-05-31 2001-12-12 Pfeifer Seil- und Hebetechnik GmbH & Co. Stahlbetonfertigbauteil

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US871075A (en) * 1907-06-17 1907-11-12 Minneapolis Steel & Machinery Company Reinforced steel beam.
US1205465A (en) * 1913-06-30 1916-11-21 Patrick J Maguire Reinforced-concrete building construction.
FR1105452A (fr) * 1950-04-07 1955-12-05 éléments de construction, édifices et ouvrages d'art obtenus par l'utilisation de ces éléments
US3243927A (en) * 1963-04-04 1966-04-05 Eugene R Hilson Reinforced concrete members and footing supports therefor
US3487597A (en) * 1969-04-02 1970-01-06 Cleveland Builders Supply Co T Integral precast concrete lintelbalcony combination
US3605353A (en) * 1969-05-01 1971-09-20 Gordon L Marcott Building panel and building construction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US871075A (en) * 1907-06-17 1907-11-12 Minneapolis Steel & Machinery Company Reinforced steel beam.
US1205465A (en) * 1913-06-30 1916-11-21 Patrick J Maguire Reinforced-concrete building construction.
FR1105452A (fr) * 1950-04-07 1955-12-05 éléments de construction, édifices et ouvrages d'art obtenus par l'utilisation de ces éléments
US3243927A (en) * 1963-04-04 1966-04-05 Eugene R Hilson Reinforced concrete members and footing supports therefor
US3487597A (en) * 1969-04-02 1970-01-06 Cleveland Builders Supply Co T Integral precast concrete lintelbalcony combination
US3605353A (en) * 1969-05-01 1971-09-20 Gordon L Marcott Building panel and building construction

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067166A (en) * 1975-06-12 1978-01-10 Sheahan Edmund C Retaining block
US4612751A (en) * 1985-07-09 1986-09-23 Dur-O-Wal, Inc. Dapped end reinforcement assembly for precast prestressed concrete members
EP0923857B1 (en) * 1997-12-15 2002-04-24 Johannes Hermanus C. H. Swaans Pen floor for livestock pens, for pigsties in particular, including floor panel and transverse beam to be incorporated in the pen floor
KR100974672B1 (ko) * 2008-01-28 2010-08-06 이승재 절곡강판을 이용하여 댑단부가 보강된 피씨 보
EP2166171A1 (de) * 2008-09-23 2010-03-24 Ancotech Ag Anordnung zum Bewehren eines Betonbauwerkes gegen Durchstanzen im Bereich der Auflage eines Deckenelementes auf einer Stütze sowie Durchstantbewehrungselement hierfür
US20150292193A1 (en) * 2009-07-08 2015-10-15 Housh Rahimzadeh Building Structure Including Balcony
US9885172B2 (en) * 2009-07-08 2018-02-06 Diversakore Llc Building structure including balcony
US20220049495A1 (en) * 2018-09-10 2022-02-17 Hcsl Pty Ltd Building panel
WO2022154671A1 (en) * 2021-01-12 2022-07-21 Ogs Seed As A building element of prefabricated concrete

Also Published As

Publication number Publication date
DE2058714A1 (de) 1972-11-16
GB1366518A (en) 1974-09-11
FR2115284A3 (xx) 1972-07-07
NL7116159A (xx) 1972-05-30
IT942976B (it) 1973-04-02
BE774213A (fr) 1972-04-20
FR2115284B3 (xx) 1974-08-19
CH544856A (de) 1973-11-30

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