EP0325578B1 - Bewehrungskorb zur anwendung in formen zum giessen von künstlichem steinmaterial und methode zur herstellung des bewehrungskorbes - Google Patents

Bewehrungskorb zur anwendung in formen zum giessen von künstlichem steinmaterial und methode zur herstellung des bewehrungskorbes Download PDF

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Publication number
EP0325578B1
EP0325578B1 EP86905987A EP86905987A EP0325578B1 EP 0325578 B1 EP0325578 B1 EP 0325578B1 EP 86905987 A EP86905987 A EP 86905987A EP 86905987 A EP86905987 A EP 86905987A EP 0325578 B1 EP0325578 B1 EP 0325578B1
Authority
EP
European Patent Office
Prior art keywords
reinforcing
irons
cage
cross
group
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
EP86905987A
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English (en)
French (fr)
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EP0325578A1 (de
Inventor
Kaj Adler
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Internationella Siporex AB
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Internationella Siporex AB
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Publication date
Application filed by Internationella Siporex AB filed Critical Internationella Siporex AB
Publication of EP0325578A1 publication Critical patent/EP0325578A1/de
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Publication of EP0325578B1 publication Critical patent/EP0325578B1/de
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
    • 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
    • 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
    • E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
    • E04C5/0613—Closed cages made of one single bent reinforcement mat

Definitions

  • the present invention relates to a reinforcing cage intended for use when casting artificial stone materials.
  • artificial stone materials is meant primarily light-weight concrete, particularly light-weight aerated concrete, although the term as used here shall also be understood to include conventional concrete, i.e. so-called heavy-weight aggregate concrete.
  • the invention relates to a reinforcing cage intended for the aforesaid purpose which comprises a first group of elongated, mutually parallel reinforcing irons or rounds intended to reinforce the upper edge or side surface of a slab or plate cast from the artificial stone material, and a second group of elongate, mutually parallel reinforcing irons or rounds intended to reinforce the bottom edge or side surface of the same slab or plate, the two groups of reinforcing irons being connected together by transverse stirrup-like devices.
  • Such slabs or plates are primarily used in the construction of ceiling structures and joists, beams, etc., in various types of building constructions.
  • a reinforcing cage of this kind is known in connection with the reinforcement of gas concrete structures, the cage being-placed in the mould in its open form.
  • the cage is suspended in the mould and held positioned therein with the aid of separate positioning and securing rods which, through the intermediary of auxiliary support elements which rest on the upper edges of the mould or form, secure and support the reinforcing cage in one given rotational position of the rods prior to and during the moulding operation, but which in another position of rotation of said rods occopy a position in which they can be released from engagement with the support elements when the aerated concrete structure has set sufficiently to enable it to support the reinforcing cage unaided.
  • the positioning and securing rods are withdrawn from said structure, and the structure, in the majority of cases, is then divided into smaller elements, which are preferably cured in an autoclave.
  • the known reinforcing cages of this kind are normally of U-shaped, or substantially U-shaped cross-section.
  • the U-shaped cross-sectional configuration is obtained by connecting, preferably by welding, one group of said reinforcing irons or rounds intended to form a reinforcement for the bottom edge or side surfaces of the moulded structure to the central part of those cross pins which, subsequent to being bent, form the aforesaid transverse stirrup-like devices, and by attaching the reinforcing irons or rounds in the other of said groups in uniform spaced relationship to respective end positions of the cross pins, said end portions, subsequent to being bent, forming inwardly directed end parts which extend parallel with the central part of respective pins, these latter end parts being connected to the centre-pieces corresponding to the central part of the cross pins by means of a side piece associated with each end part and in each particular case corresponding to the legs of the U-shape.
  • the resultant reinforcing cage has a rectangular profile, of which the one of the long sides of the rectangle is broken, and is subsequently provided with means for guiding a positioning and securing rod in one of the cage side-pieces, and means in the other of the cage side-pieces for guiding and loosely carrying the cage in a mould or form so as to be embedded in a solidifiable light-weight aerated concrete mass, whereupon the cage is turned through 90° and one or more positioning end suspension rods are placed in position. The cage incorporating said rods is then introduced into the form or mould and the concrete allowed to set.
  • the rods are detached from the cage and withdrawn from the solidifying structure, which is then optionally cut into smaller elements and treated with steam under pressure in order to steam cure the structure or structures.
  • One drawback with such reinforcing cages is that they present an interrupted configuration when seen in cross-section, therewith impairing the mechanical strength of the resultant moulded structure.
  • a further drawback is that two working operations are required in the manufacture of the cage, in bringing the cage positioning and securing rods and the cage positioning and carrying rods in position in the form or mould prior to pouring the porous concrete forming material thereinto.
  • the reinforcing rods or rounds of the group intended to reinforce the bottom edge or side surface of the moulded structure are attached to a central part of respective cross pins which, subsequent to being bent, are intended to form the transverse stirrup-like connectors in the cage, and the reinforcing irons or rounds intended to form the top edge or side surface reinforcement in said structure are uniformly distributed on two side parts of the cross pins which are intended, subsequent to being bent, to form the side-pieces of the transverse connectors, whereafter the resultant mat of reinforcing rods and cross pins is bent to the intended U-shape, and the thus constructed reinforcing cage is provided with means for guiding, or suspending and guiding, the positioning rods in the side-pieces of the cage and, after being turned through 90°, is inserted in and suspended in the mould by means of the securing and positioning rods.
  • the reinforcing cage is provided with means for guiding, or suspending and guiding, the positioning rods in the side-pieces of the cage
  • the object of the invention is to eliminate these drawbacks fully or at least substantially.
  • An additional advantage with the reinforcing cage is that the connector can be made of the same material as the reinforcing material in a relatively simple manner.
  • the legs of the transverse stirrups are such as to be urged away from one another in their sprung state by an inherent spring force.
  • the hooked cross-connectors have provided in the centre thereof a curved bend or like means which is intended to be gripped by the suspension means and positioning means when suspending and positioning the cage in the form or mould, preferably through the intermediary of separate holders, e.g. in the form of angle pins, incorporated in said means.
  • the main advantage afforded by this embodiment is one relating primarily to manufacture.
  • the bends can be made readily and rationally in conjunction with forming the hook-shaped bends in the ends of the cross-connectors.
  • the invention also relates to a method for manufacturing a reinforcing cage or the like of the aforedescribed kind.
  • the method is characterized by the steps set forth in the following Claim 4.
  • US patent specification No. 1 636 163 is concerned with a structural unit for the reinforcement of beams and the like, said unit comprising a plurality of U-shaped chair elements and U-shaped stirrup elements which are kept together by cross bars to which said elements are attached by welding.
  • the longitudinal elements may serve as supports for the cross bars.
  • the structural units are placed with their legs in a position, when not urged or spring biased.
  • NO patent specification No. 150,524 is concerned with a holder adapted to be used in concrete moulding, consisting of a wire-net cage having vertical planar sides adapted to surround a body of insulating material.
  • AU patent specification No. 529,548 is concerned with some kind of structural unit adapted to serve as a reinforcement in a mould for concrete casting.
  • the reference discloses the feature of connecting the legs of a U-shaped open reinforcement cage detachably by means of transverse members in casting operations of the type as indicated.
  • Figure 1 illustrates a completed reinforcing cage intended for reinforcing floor and ceiling slabs made of steam-cured light-weight aerated concrete.
  • the cage includes a first group of reinforcing irons or rounds 1 intended for reinforcing the top edge or side surface of a respective floor or ceiling slab, and a second group of reinforcing irons or rounds 2 intended for reinforcing the bottom edge or side surface of the same slab.
  • the locations of the reinforcing irons in the finished slab of steam-cured light-weight concrete are shown in Figure 6.
  • the groups of reinforcing irons 1 and 2 are held together at their respective ends, by means of transverse stirrups 3, 4 each of which has two legs 5, 6 and a web 7, and has the form of an upstanding U when seen in the position illustrated in the drawings.
  • the reinforcing irons are welded to respective stirrups in some suitable manner.
  • the upper ends of the transverse stirrups 3, 4 are held together by cross-connectors 8.
  • Each cross-connector 8 is provided at each end thereof with a hooked portion 9 and has a curved bend 10 located in the centre thereof.
  • Each hooked portion 9 engages around an associated leg 5 of a respective transverse stirrup 3, 4.
  • the cross-connectors 8 hold together the legs 5, 6 of the stirrups 3, 4 against the action of a sprung restoring force, thereby to afford good stability to the construction and to form a mechanically rigid system which is fully closed when seen in cross-section and which will not result in undesirable movement in the finished slab.
  • the web 7 of the transverse stirrups 3, 4 presents a small U-shaped member 11 which is welded to the web 7 at a location vertically beneath the curved bend 10 and which together with a contigous part of the web forms a ring 11 for accomodating a positioning and securing rod 12 (vide Figure 5) intended to form means for fixating and suspending the reinforcing cage in a mould or form.
  • FIG 2 illustrates the state of the reinforcing cage shown in Figure 1 prior to attaching the cross-connectors 8. It will be seen that in this prior state of the cage the legs 5, 6 of the transverse stirrups are splayed apart. When attaching the cross-connectors 8, the legs 5, 6 are urged towards each other against the action of an inherent spring restoring force, to a position in which the hook-shaped bends 9 are able to engage the end portion of respective leg 5 or 6, in order to couple said portions in a sprung or spring-biassed position. This outward splaying of the legs 5, 6 enables the relaxed reinforcing cages to be stacked one inside the other, thereby facilitating transportation of the cages, among other things.
  • Figures 3 and 4 illustrate together the method of constructing the cage pre-form illustrated in Figure 1, which is capable of being brought to a sprung state.
  • two groups of reinforcing irons or rounds are placed in the form of a mat, of which groups a first contains the irons 1 intended to reinforce the top side surface or edge surface of the finished reinforced slab of steam cured aerated conrete, and the second group contains the irons 2 intended to reinforce the bottom side or edge surface of said slab.
  • Cross-pins 13, which ultimately form the transverse stirrups 3, 4 in the finished reinforcing cage, are then placed on top of the resultant "mat” and welded firmly to the reinforcing rods at their points of intersection with the pins.
  • the rigid mat of reinforcing irons 1, 2 and cross-pins 13 is then bent mechanically, with the aid of a suitable shaping bar 18 which is placed between the furthest right-hand reinforcing iron in the group of top surface reinforcing irons and the furthest left-hand iron in the group of bottom surface reinforcing irons.
  • a force is then applied to each end of the cross-pins 13 in the direction of the arrows 14, such as to deform the rigid mat to the shape illustrated in Figure 4.
  • the resultant reinforcing cage obtains "elastic memory properties", since the legs 5, 6 of the transverse stirrups with the reinforcing irons of both groups securely attached thereto are imparted a restoring spring force which urges the legs back to the position illustrated in Figure 2.
  • the legs 5, 6 of the transverse stirrups are forced towards one another against the action of this restoring force and are held in the sprung or spring-biassed position illustrated in Figure 1 with the aid of the cross-connectors 8, so as to provide the cage configuration illustrated in Figure 1.
  • the reinforcing cage When the reinforcing cage is used in the manufacture of a reinforced concrete structure, it is placed in a form or mould 15 intended for receiving a light-weight aerated concrete producing material, in accordance with Figure 5.
  • the cage is positioned in the mould by suspending the cage within the interior of said mould with the aid of the positioning and securing rods 12, which are brought into engagement with the ring 11 on the web 7 of one of the transverse stirrups 3 or 4, and with the curved bend 10 on a respective cross-connector 8.
  • the construction is secured with the aid of an angle pin (not shown) which is provided on respective positioning rods 12 and against which the curved bend 10 rests.
  • the positioning rods 12 are also provided at their upper ends with a similar angle pin 16.
  • This pin is intended to rest against a bar 17 which bridges to two side walls of the mould 15.
  • the mould 15 is now filled with a light-weight aerated concrete forming material, i.e. in practice a material comprising an aqueous slurry of one or more silica-containing materials, e.g. sand, and one or more hydraulic binders, such as Portland cement or hydraulic lime, and powdered aluminium, the ability of the material to expand being dependent on the reaction of the aluminium powder with the alkaline constituants of the hydraulic binder while generating hydrogen gas, whereupon the mixture swells up. Subsequent to the mixture expanding, the mixture begins to solidify and ultimately becomes sufficiently stiff to support the reinforcing cage unaided.
  • a light-weight aerated concrete forming material i.e. in practice a material comprising an aqueous slurry of one or more silica-containing materials, e.g. sand, and one or more hydraulic binders, such as Portland
  • the supporting bar 17 is now removed and the positioning and securing rods 12 are rotated about their longitudinal axes with the aid of the angle pin 16, to a position in which the first-mentioned angle pins (not shown), which have hitherto supportingly engaged respective support members 11 on the cross-connectors 8, are out of engagement with said members, therewith to enable the positioning rods 12 to be readily withdrawn from the cast material.
  • the mould is stripped and the moulded structure is loaded into an auloclave, where it is steam cured.
  • a mould will accommodate a multiple of reinforcing cages, and the resultant casting may be cut into smaller elements.
  • the final steam-cured gras concrete structure can be used as a structural component in various kinds of building constructions. Because the reinforcing cage is fully continuous when seen in cross-section, the cage is stronger than the earlier known cages, with less risk of the steam-cured material cracking, at the same time as the working operation in which the means for effecting suspension of the positioning rods at the top of the cage can be formed on the cross-connectors 8 during their manufacture, there being no difficulty in forming, at the same time, a curved bend 10 in respective transverse stirrups for securing the temporary engagement of the positioning rods 12 therewith during the stage in which the reinforcing cage is not surrounded by gas concrete material or a material which is not sufficiently solid to support the cage.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Reinforcement Elements For Buildings (AREA)

Claims (4)

1. Bewehrungskorb zum Einsetzen in einer Form zum Gießen von künstlichem Steinmaterial, bestehend aus einer Gruppe aus gestreckten, gegenseitig parallelen Bewehrungseisen (1),um die obere Kante oder Seitenfläche einer Platte aus gegossenem künstlichen Steinmaterial zu verstärken und einer zweiten Gruppe aus gestreckten, gegenseitig parallelen Bewehrungseisen (2), um die Bodenkante oder Seitenfläche derselben Platte zu verstärken, wobei die Gruppen aus Bewehrungseisen durch querlaufende bügelartige Verbindungen (3, 4) zusammengehalten werden, dadurch gekennzeichnet, daß die Beine (5, 6) der querlaufenden Bügel (3, 4) mit Hilfe von Querverbindern (8), die mit Haken (9) versehen sind, federnd oder in einem federvorgespannten Zustand gehalten werden, wobei die Querverbinder (8) mit Haken (9) aus Bewehrungseisen sind, die an jedem ihrer Enden zu einer Hakenform gebogen worden sind.
2. Bewehrungskorb nach Anspruch 1, dadurch gekennzeichnet, daß die Beine (5, 6) der querlaufenden Bügel (3, 4) in gespannter Position auseinandergetrieben werden.
3. Bewehrungskorb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die mit Haken (9) versehenen Querverbinder (8) eine gekrümmte Biegung (10) aufweisen, die dazu gedacht ist, eine Aufhängeoder Positionierungsvorrichtung aufzunehmen, um den Bewehrungskorb in der Form aufzuhängen oder zu positionieren.
4. Verfahren zur Herstellung eines Bewehrungskorbes zum Einsetzen in eine Form zum Gießen von künstlichem Steinmaterial, insbesondere von Leichtbeton, bestehend aus einer ersten Gruppe aus gestreckten, gegenseitig parallelen Bewehrungseisen (1), die dazu gedacht sind, um die obere Kante oder Seitenfläche einer Platte, die aus dem künstlichen Steinmaterial gegossen ist, zu verstärken, und einer zweiten Gruppe aus gestreckten, gegenseitig parallelen Bewehrungseisen (2), um die Bodenkante oder Seitenfläche derselben Platte zu verstärken, wobei die Gruppen aus Bewehrungseisen durch querlaufende bügelartige Vorrichtungen (3, 4) zusammengehalten werden und die Beine (5, 6) der querlaufenden Bügel (3, 4) gespannt sind oder unter Federvorspannung stehen und durch Querverbinder (8), die mit Haken (9) versehen sind, unter Spannung gehalten werden, wobei die Querverbinder (8) Bewehrungseisen sind, deren Enden jeweils in Hakenform gebogen sind, dadurch gekennzeichnet, daß die erste Gruppe der gestreckten gegenseitig parallelen Bewehrungseisen (1) und die zweite Gruppe der gestreckten gegenseitig parallelen Bewehrungseisen (2) an eine Vielzahl von Querstäben (13) angebracht werden, um nach dem Biegen querlaufende Bügel (3, 4) zu bilden und um eine Matte zu formen, daß die Matte gegen einen Formbalken (18) oder einen anderen geeigneten Formkörper zwischen der ersten Gruppe (1) und der zweiten Gruppe (2) der Bewehrungseisen gepreßt wird, um Biegungen in die Querstäbe zu formen und die querlaufenden Bügel (3, 4) zu bilden, und daß die Bewehrungseisen je an einem ihrer Enden in der beabsichtigten und betreffenden Position zum Haken geformt werden.
EP86905987A 1985-09-27 1986-09-23 Bewehrungskorb zur anwendung in formen zum giessen von künstlichem steinmaterial und methode zur herstellung des bewehrungskorbes Expired - Lifetime EP0325578B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8504482A SE453680B (sv) 1985-09-27 1985-09-27 Armeringskorg avsedd for gjutformar for gjutning av konststen-massor samt forfarande for framstellning av armeringskorgen
SE8504482 1985-09-27

Publications (2)

Publication Number Publication Date
EP0325578A1 EP0325578A1 (de) 1989-08-02
EP0325578B1 true EP0325578B1 (de) 1992-01-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86905987A Expired - Lifetime EP0325578B1 (de) 1985-09-27 1986-09-23 Bewehrungskorb zur anwendung in formen zum giessen von künstlichem steinmaterial und methode zur herstellung des bewehrungskorbes

Country Status (9)

Country Link
EP (1) EP0325578B1 (de)
JP (1) JPS63502293A (de)
KR (1) KR880700135A (de)
AU (1) AU582910B2 (de)
DE (1) DE3683376D1 (de)
DK (1) DK266587D0 (de)
NO (1) NO872154D0 (de)
SE (1) SE453680B (de)
WO (1) WO1987002087A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1273800B (it) * 1994-02-10 1997-07-10 Schnell Srl Metodo e apparecchiatura per realizzare gabbie metalliche per cemento armato e gabbia metallica cosi' ottenuta
AU2005244578B2 (en) * 2004-12-16 2012-03-15 The Austral Brick Company Pty Ltd Reinforced cementitious material product and method of manufacture of the same
JP6636262B2 (ja) * 2014-07-17 2020-01-29 三栄商事株式会社 鉄筋コンクリート梁の配筋構造および配筋方法
JP6554456B2 (ja) * 2016-12-28 2019-07-31 未来建築研究所株式会社 Ｒｃ造梁せん断筋ユニット及びｒｃ造梁の施工方法
AT17497U1 (de) * 2021-01-13 2022-06-15 Avi Alpenlaendische Veredelungs Ind Gesellschaft M B H Bewehrungselement zur Erhöhung eines Querkraftwiderstandes

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1636163A (en) * 1925-11-06 1927-07-19 Union Steel Prod Co Structural unit
US2146758A (en) * 1937-02-15 1939-02-14 Chester J O'brien Structural unit
DE814936C (de) * 1950-03-23 1951-09-27 Bruno Zeidler Bewehrung fuer die Rippen von Stahlbeton-Rippendecken
NO150524C (no) * 1980-02-21 1984-10-31 Gryts Bruk Ab Isolasjonsholder for anvendelse ved betongstoepning
AU529548B2 (en) * 1981-07-15 1983-06-09 Bela Bogar Reinforcement stirrup for trench foundation
DE3313793A1 (de) * 1983-04-15 1984-10-18 Ytong AG, 8000 München Bewehrungskoerper aus stahlmatten
AT378806B (de) * 1983-11-17 1985-10-10 Avi Alpenlaendische Vered Buegelkorb

Also Published As

Publication number Publication date
DE3683376D1 (de) 1992-02-20
SE8504482D0 (sv) 1985-09-27
SE453680B (sv) 1988-02-22
AU6401286A (en) 1987-04-24
NO872154L (no) 1987-05-22
KR880700135A (ko) 1988-02-15
DK266587A (da) 1987-05-26
AU582910B2 (en) 1989-04-13
WO1987002087A1 (en) 1987-04-09
EP0325578A1 (de) 1989-08-02
NO872154D0 (no) 1987-05-22
DK266587D0 (da) 1987-05-26
JPS63502293A (ja) 1988-09-01
SE8504482L (sv) 1987-03-28

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