WO1991000400A1 - Prefabricated floor slab - Google Patents

Prefabricated floor slab Download PDF

Info

Publication number
WO1991000400A1
WO1991000400A1 PCT/SE1990/000460 SE9000460W WO9100400A1 WO 1991000400 A1 WO1991000400 A1 WO 1991000400A1 SE 9000460 W SE9000460 W SE 9000460W WO 9100400 A1 WO9100400 A1 WO 9100400A1
Authority
WO
WIPO (PCT)
Prior art keywords
slab
recesses
concrete
poured concrete
lifting eyes
Prior art date
Application number
PCT/SE1990/000460
Other languages
French (fr)
Inventor
Thure Holm
Original Assignee
Prefatech Ab
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 Prefatech Ab filed Critical Prefatech Ab
Publication of WO1991000400A1 publication Critical patent/WO1991000400A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • E04G21/142—Means in or on the elements for connecting same to handling apparatus
    • 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
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element

Definitions

  • the present invention relates to a prefabricated, con ⁇ crete flooring slab provided with reinforcement steel, and intended to be provided after erection with a screed or the like of poured concrete, and implemented according to the preamble to Claim 1.
  • the prefabricated slab which is provided at op ⁇ posing end portions with pit-like recesses in its upper side, these recesses having sides which are substantially perpendicular to the upper side and which can take up shear forces from the poured con ⁇ crete when the slab is loaded, is characterized in that arched reinforcing bars, which form lifting eyes, extend up from the bottom of the recesses to a height such that the intended poured concrete will cover the lifting eyes.
  • the shear forces are here substantially transmitted by compressive forces between the poured concrete and the sides of the recesses.
  • the shear forces can thus be transmitted in optional horizontal directions, which allows bending moments with optional direction of the vector to be utilized,
  • SUBSTITUTE SHEET which may be the situation in the vicinity of suppor ⁇ ting beams coacting in the finished structure, a con ⁇ siderable reinforcement of the effect of the recesses on the shear forces being obtained by the inventive implementation.
  • the part of the lifting eyes situated nearest the bottom of the recesses are prefeably substantially perpendicular to the upper side of the slab for best coaction with pressure forces from parts of the sides of the recesses.
  • the inner ends of the lifting eyes can be fixed, e.g. welded, to the reinforcement of the slab, and earch recess is to advantage provided with two arched rein ⁇ forcing bars situated in two planes forming 90° with each other. Alternatively, they may be implemented as an integrated part of the longitudinal reinforcement of the slab.
  • the poured concrete functions as a bar with constant normal force, which is less effec ⁇ tive than in continuos shear force transmission, but the differences are in general without importance.
  • Figure 1 is a plan of the slab
  • Figure 2 is a side view of the slab in Figure 1;
  • Figure 3 is a plan of a part of the slab illustrating a recess with two bars forming a lifting eye; and
  • SUBSTITUTESHEET Figure 4 is a section along the line IV-IV in Figure 3.
  • Figures 1 and 2 illustrate the conventionally dimen ⁇ sioned, prefabricated flooring slab 1, which is pro ⁇ vided with two recesses 2 arranged at each end portion thereof, and in which recesses the lifting eyes 3 are upstanding. Concrete intended to be poured after erec ⁇ ting, the slab is denoted by the numeral 4 and indi ⁇ cated by a chain dotted line.
  • Figures 3 and 4 illustrate a recess 2 with two arched reinforcing steel bars 5, 6 upstanding in it such as to form a lifting eye.
  • the legs 7,8 of the bars 5, 6 extend substantially perpendicular to the conventional reinforcement with longitudinal reinforcing steel bars 10 of the slab 1, outwardly bent end portions 11, 12 of the bars 5, 6 being welded or otherwise united with the bars 10.

Abstract

The invention relates to a prefabricated, concrete flooring slab (1) provided with reinforcement steel (10), and after erection intended to be provided with a screed (4) or like concrete pouring. So that the finished structure shall function as a unit, from the loading aspect, shear forces from the poured concrete (4) must be effectively taken up by the slab (1). For this reason, the slab is provided with recesses (2) at opposing end portions on its upper side, such that when the slab is loaded they can take up shear forces coming from the poured concrete, these recesses being provided with arched reinforcing bars (5, 6) forming lifting eyes and extending up from the bottom of the recesses (2) to a height such that the intended poured concrete (4) will cover the lifting eyes.

Description

Prefabricated Floor Slab
The present invention relates to a prefabricated, con¬ crete flooring slab provided with reinforcement steel, and intended to be provided after erection with a screed or the like of poured concrete, and implemented according to the preamble to Claim 1.
For the finished structure to function as a unit, where the cross-section of the poured concrete coacts in the deflected cross-section, so that the design height will be equal to the thickness of the prefabricated slab and the thickness of the poured concrete, measures must be taken so that shear forces occurring in one layer shall be transmitted to the other layer.
This has been achieved by the invention, according to which the prefabricated slab, which is provided at op¬ posing end portions with pit-like recesses in its upper side, these recesses having sides which are substantially perpendicular to the upper side and which can take up shear forces from the poured con¬ crete when the slab is loaded, is characterized in that arched reinforcing bars, which form lifting eyes, extend up from the bottom of the recesses to a height such that the intended poured concrete will cover the lifting eyes.
The shear forces are here substantially transmitted by compressive forces between the poured concrete and the sides of the recesses.
The shear forces can thus be transmitted in optional horizontal directions, which allows bending moments with optional direction of the vector to be utilized,
SUBSTITUTE SHEET which may be the situation in the vicinity of suppor¬ ting beams coacting in the finished structure, a con¬ siderable reinforcement of the effect of the recesses on the shear forces being obtained by the inventive implementation.
The part of the lifting eyes situated nearest the bottom of the recesses are prefeably substantially perpendicular to the upper side of the slab for best coaction with pressure forces from parts of the sides of the recesses.
The inner ends of the lifting eyes can be fixed, e.g. welded, to the reinforcement of the slab, and earch recess is to advantage provided with two arched rein¬ forcing bars situated in two planes forming 90° with each other. Alternatively, they may be implemented as an integrated part of the longitudinal reinforcement of the slab.
Between therecesses, the poured concrete functions as a bar with constant normal force, which is less effec¬ tive than in continuos shear force transmission, but the differences are in general without importance.
The invention is more clearly explained in the follow¬ ing, with reference to the accompanying drawing sche¬ matically illustrating an embodiment of a prefabricated flooring slab in accordance with the invention, and where
Figure 1 is a plan of the slab;
Figure 2 is a side view of the slab in Figure 1; Figure 3 is a plan of a part of the slab illustrating a recess with two bars forming a lifting eye; and
SUBSTITUTESHEET Figure 4 is a section along the line IV-IV in Figure 3.
Figures 1 and 2 illustrate the conventionally dimen¬ sioned, prefabricated flooring slab 1, which is pro¬ vided with two recesses 2 arranged at each end portion thereof, and in which recesses the lifting eyes 3 are upstanding. Concrete intended to be poured after erec¬ ting, the slab is denoted by the numeral 4 and indi¬ cated by a chain dotted line.
Figures 3 and 4 illustrate a recess 2 with two arched reinforcing steel bars 5, 6 upstanding in it such as to form a lifting eye. The legs 7,8 of the bars 5, 6 extend substantially perpendicular to the conventional reinforcement with longitudinal reinforcing steel bars 10 of the slab 1, outwardly bent end portions 11, 12 of the bars 5, 6 being welded or otherwise united with the bars 10.
SUBSTITUTE SHEET

Claims

1. Prefabricated, concrete flooring slab (1) provided with reinforcement steel and intended to be provided after erection with a screed (4) or like pouring of concrete, the slab being provided at two opposing end portions with recesses (2) in its upper side, these recesses having sides which are substantially perpen¬ dicular to the upper side, and which can take up shear forces from the poured concrete when the slab is loaded, c h a r a c t e r i z e d in that arched reinforcing bars (5,6), which form lifting eyes , extend up from the bottom of the recesses (2) to a height such that the intended poured concrete (4) will cover the lif- ting eyes (5,6) .
2. Flooring slab as claimed in Claim 1, c h a r a c t ¬ e r i z e d in that the parts (7, 8) of the lifting eyes (5, 6) .which are nearest the bottom of the recesses (2) are substantially perpendicular to the upper side (9) of the slab.
3. Slab as claimed in Claim 1 or 2, c h a r a c ¬ t e r i z e d in that the inner ends (11, 12) of the lifting eyes are united with the reinforcement (10) of the slab (4) .
4. Slab as claimed in any one of Claims 1-3, c h a r a c t e r i z e d in that each recess (2) is provided with two arched reinforcing bars (5, 6) situ¬ ated in two planes forming 90 with each other.
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PCT/SE1990/000460 1989-06-28 1990-06-27 Prefabricated floor slab WO1991000400A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902347-7 1989-06-28
SE8902347A SE463774B (en) 1989-06-28 1989-06-28 PREFABRICATED BJAELKLAGLATPLATTA

Publications (1)

Publication Number Publication Date
WO1991000400A1 true WO1991000400A1 (en) 1991-01-10

Family

ID=20376426

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000460 WO1991000400A1 (en) 1989-06-28 1990-06-27 Prefabricated floor slab

Country Status (2)

Country Link
SE (1) SE463774B (en)
WO (1) WO1991000400A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0898026A2 (en) * 1997-08-22 1999-02-24 Ziegelwerk Gundelfingen GmbH Prefabricated house
FR2784703A1 (en) * 1998-10-19 2000-04-21 Motrex Soc Concrete slab manufacturing process, utilizes molded pockets that can be filled at a later stage such that cables can be attached to the concrete slab
EP1126095A2 (en) * 2000-02-18 2001-08-22 Sergio Zambelli Prefabricated concrete panel for building floors in civil or industrial structures
GB2402683A (en) * 2003-06-09 2004-12-15 Gerard Doyle Shaping tie bars: reinforced concrete slab
EP1700954A2 (en) * 2004-12-23 2006-09-13 SEAP Costruzioni Generali S.p.a. Prefabricated modular member, permanent railway for tramways and subways including said member, and process for laying the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE805553C (en) * 1949-11-01 1951-05-21 Erich Meyer Process for the production of reinforced concrete rib ceilings
DE2014558A1 (en) * 1969-03-28 1970-10-08 Kranebitter, Rudolf, Pfaffenhofen, Tirol (Österreich) Prefabricated ceiling part and process for the production of a reinforced concrete solid ceiling
US4693046A (en) * 1985-05-13 1987-09-15 Yoshihiro Murayama Method of constructing floor for buildings or similar structures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE805553C (en) * 1949-11-01 1951-05-21 Erich Meyer Process for the production of reinforced concrete rib ceilings
DE2014558A1 (en) * 1969-03-28 1970-10-08 Kranebitter, Rudolf, Pfaffenhofen, Tirol (Österreich) Prefabricated ceiling part and process for the production of a reinforced concrete solid ceiling
US4693046A (en) * 1985-05-13 1987-09-15 Yoshihiro Murayama Method of constructing floor for buildings or similar structures

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0898026A2 (en) * 1997-08-22 1999-02-24 Ziegelwerk Gundelfingen GmbH Prefabricated house
EP0898026A3 (en) * 1997-08-22 1999-04-14 Ziegelwerk Gundelfingen GmbH Prefabricated house
FR2784703A1 (en) * 1998-10-19 2000-04-21 Motrex Soc Concrete slab manufacturing process, utilizes molded pockets that can be filled at a later stage such that cables can be attached to the concrete slab
EP1126095A2 (en) * 2000-02-18 2001-08-22 Sergio Zambelli Prefabricated concrete panel for building floors in civil or industrial structures
EP1126095A3 (en) * 2000-02-18 2001-10-24 Sergio Zambelli Prefabricated concrete panel for building floors in civil or industrial structures
US6457288B2 (en) 2000-02-18 2002-10-01 Sergio Zambelli Prefabricated concrete panel for building floors in civil or industrial structures
GB2402683A (en) * 2003-06-09 2004-12-15 Gerard Doyle Shaping tie bars: reinforced concrete slab
GB2402683B (en) * 2003-06-09 2006-04-26 Gerard Doyle A precast reinforced concrete slab
EP1700954A2 (en) * 2004-12-23 2006-09-13 SEAP Costruzioni Generali S.p.a. Prefabricated modular member, permanent railway for tramways and subways including said member, and process for laying the same
EP1700954A3 (en) * 2004-12-23 2007-02-21 SEAP Costruzioni Generali S.p.a. Prefabricated modular member, permanent railway for tramways and subways including said member, and process for laying the same

Also Published As

Publication number Publication date
SE8902347L (en) 1990-12-29
SE463774B (en) 1991-01-21
SE8902347D0 (en) 1989-06-28

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