EP0755473A1 - Dübelleiste für schubbewehrungen - Google Patents
Dübelleiste für schubbewehrungenInfo
- Publication number
- EP0755473A1 EP0755473A1 EP95911320A EP95911320A EP0755473A1 EP 0755473 A1 EP0755473 A1 EP 0755473A1 EP 95911320 A EP95911320 A EP 95911320A EP 95911320 A EP95911320 A EP 95911320A EP 0755473 A1 EP0755473 A1 EP 0755473A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dowel
- shaft
- bar
- end sections
- strip according
- 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.)
- Granted
Links
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
- E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs
-
- 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
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
-
- 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
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
-
- 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
Definitions
- the invention relates to a dowel bar for shear reinforcement in beams or plates made of reinforced concrete, consisting of a bar and several dowels welded at a distance from each other at one end at right angles to the bar, each with a dowel shaft and at its end facing away from the dowel shaft have widened dowel head.
- Known dowel strips of this type (DE-PS 27 27 159.6) are used in beams and plates made of reinforced concrete in the area of support points, in particular in the area of column connections, to form shear reinforcements in order to absorb the transverse forces occurring there as a result of the vertical column forces.
- the dowel shaft is smoothly cylindrical; the resultant, relatively small bond between the dowel shaft and the concrete causes the post force to be directed to the dowel head or to the ledge.
- the object of the invention is therefore to design a dowel strip of the type mentioned in such a way that an effective crack width limitation in the concrete is achieved without additional material or labor and while maintaining the effective formation of truss nodes on the dowel heads and on the strips.
- the dowel shaft has a smooth cylindrical shape on its two shaft end sections and that an intermediate shaft middle section is provided with ribs on its surface.
- each dowel required to form the truss knot is maintained in that the two shaft end sections adjacent to the dowel ends are smooth and therefore only achieve a very slight bond with the surrounding concrete.
- the desired good bond between the dowel and the surrounding concrete is achieved in the ribbed shaft middle section lying between the two smooth shaft end sections, which preferably consists of reinforcing steel. This bond limits the width of the shear cracks that form in the concrete along the inclined pressure struts. This increases the load-bearing capacity of the beam or slab thus reinforced without the need for additional reinforcement.
- the dowel shaft can be made of ribbed steel, the ribs of which are smoothed on the two shaft end sections.
- the shaft middle section made of rebar steel it is also possible for the shaft middle section made of rebar steel to be welded to the two shaft end sections made of smooth bar steel.
- the length of the shaft center section provided with ribs essentially depends on the height at which the shear cracks to be limited in the concrete are to be expected. In individual cases, this can be determined from the position of the inclined pressure struts that form, which can be determined for the individual application according to the framework model mentioned at the beginning.
- 1 is a simplified partial longitudinal section through a beam in the support area of a support
- Fig. 2 shows a section along the line II-II in Fig. 1 and
- Fig. 3 is an enlarged partial view of a portion of one of the dowel bars used in the example of FIGS. 1 and 2 as shear reinforcement.
- the beam 1 shown in FIG. 1 made of reinforced concrete rests on a support 2.
- horizontal reinforcement bars 3 made of ribbed steel are inserted at the top of the beam 1.
- a number of dowel strips 4 are used as shear reinforcement in the vicinity of the column 2 in the beam 1.
- these each consist of a strip 5 lying at the bottom, which extends transversely to the longitudinal direction of the beam and at each end of which a vertical dowel 6 is attached at right angles.
- each dowel 6 has a dowel shaft 7 which is welded onto the bar 5 with its lower end. At its upper end, the dowel shaft 7 is connected to a widened, plate-shaped dowel head 8, which is preferably flat in the shape of a truncated cone on its side facing the dowel shaft 7.
- the dowel shaft 7 has a smooth cylindrical shape on its two shaft end sections 7a and 7b facing the dowel head 8 and the strip 5, respectively.
- An intermediate shaft middle section 7b is made of concrete rib steel and has ribs 9 on its surface.
- the length a or c of one or both shaft end sections 7a or 7b is, for example, 1 to 2 times the diameter d of the dowel head 8. In one example, the length a or c of one or both shaft end sections 7a or 7b is 1 / 4 to 1/10 of the length L of the dowel shaft 7.
- the dowel shaft 7 is made of ribbed steel, the ribs 9 of which are smoothed on the two shaft end sections 7a and 7c.
- the shaft center section 7b from ribbed steel and to weld it to the two shaft end sections 7a and 7c from smooth bar steel.
- the shaft end sections 7a and 7c can be thickened relative to the shaft middle section 7b.
- inclined pressure struts 10 form in the beam 1 under the force introduced by the support 2 and extend upwards to the dowel heads 8 of the dowel strips 4.
- the underside of the beam 1 forms a horizontal bending pressure belt 11 in the concrete.
- the upper bending tension belt 3, the lower bending pressure belt 11, the inclined pressure struts 10 and the dowels 6 as tension posts form a framework in the beam 1.
- the pressure struts 10 run from the dowel heads 8 not only to the support point of the support 2, but also in part to the strips 5 at the lower ends of the dowels 6.
- Truss nodes form on the dowel heads 8 and on the strips 5. Since the dowels 6 in their shaft end sections 7a and 7c do not form an essential bond with the surrounding concrete due to their smooth outer shape, the introduction of the post force at the dowel ends takes place predominantly through the positive overlapping of the dowel heads 8 or the strips 5.
- Shear cracks 12 occur in the concrete along the pressure struts 10, as indicated in FIG. 1. It can be seen that these shear cracks 12 essentially cross the dowels 6 of the dowel strips 4 in the region of the shaft middle sections 7b. Because of the ribs 9 there is a good bond between the dowel shaft 7 and the surrounding concrete. This bond between the concrete and the reinforcement counteracts widening of the shear cracks 12 and thus represents an effective crack width limitation.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Rod-Shaped Construction Members (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Air Conditioning Control Device (AREA)
- Supports For Plants (AREA)
- Coating With Molten Metal (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Bridges Or Land Bridges (AREA)
- Piles And Underground Anchors (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4412598A DE4412598A1 (de) | 1994-04-13 | 1994-04-13 | Dübelleiste für Schubbewehrungen |
DE4412598 | 1994-04-13 | ||
PCT/EP1995/000891 WO1995028534A1 (de) | 1994-04-13 | 1995-03-10 | Dübelleiste für schubbewehrungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0755473A1 true EP0755473A1 (de) | 1997-01-29 |
EP0755473B1 EP0755473B1 (de) | 2000-08-30 |
Family
ID=6515207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95911320A Expired - Lifetime EP0755473B1 (de) | 1994-04-13 | 1995-03-10 | Dübelleiste für schubbewehrungen |
Country Status (11)
Country | Link |
---|---|
US (1) | US5867960A (de) |
EP (1) | EP0755473B1 (de) |
JP (1) | JPH09512068A (de) |
AT (1) | ATE195990T1 (de) |
CA (1) | CA2187797A1 (de) |
DE (2) | DE4412598A1 (de) |
DK (1) | DK0755473T3 (de) |
ES (1) | ES2150557T3 (de) |
GR (1) | GR3034986T3 (de) |
NO (1) | NO300786B1 (de) |
WO (1) | WO1995028534A1 (de) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU1374897A (en) * | 1995-12-21 | 1997-07-17 | Deha Ankersysteme Gmbh & Co Kg | Dowel support for bent-up reinforcement bars and process for the production thereof |
DE59805834D1 (de) * | 1997-07-26 | 2002-11-07 | Deha Ankersysteme | Dübelleiste für schubbewehrungen |
US6389774B1 (en) | 2001-02-13 | 2002-05-21 | Gregory Howard Carpenter | Pipe dowel for concrete slab construction |
JP3899866B2 (ja) * | 2001-08-07 | 2007-03-28 | 鹿島建設株式会社 | 鋼板コンクリート構造の継手構造 |
DE10251779B4 (de) * | 2002-11-05 | 2007-02-22 | Fachhochschule Gießen-Friedberg | Stahlbetonbau-oder Spannbetonbauteil |
KR20070083474A (ko) * | 2004-08-18 | 2007-08-24 | 다이세이 겐세쓰 가부시키가이샤 | 전단력 보강 구조 및 전단력 보강부재 |
DE102004040584A1 (de) * | 2004-08-21 | 2006-02-23 | Schöck Bauteile GmbH | Bauelement zur Schubbewehrung |
US20060090416A1 (en) * | 2004-10-29 | 2006-05-04 | Schock Bauteile Gmbh | Reinforcing element for concrete construction |
US20060123726A1 (en) * | 2004-12-10 | 2006-06-15 | Michael Azarin | Channel anchor |
US7509783B1 (en) | 2005-07-01 | 2009-03-31 | Thomas Matousek | Reinforcing rod |
EP1754843A1 (de) * | 2005-08-18 | 2007-02-21 | SCHÖCK BAUTEILE GmbH | Bauelement zur Schubbewehrung |
US20100227359A1 (en) * | 2006-12-08 | 2010-09-09 | Tommer Jr Dale F | System and method for detection of substances |
KR100938726B1 (ko) * | 2007-07-27 | 2010-01-26 | 이완섭 | 철근 및 철근 커플러와 그 조립체 및 이들의 연결방법 |
KR100971736B1 (ko) * | 2009-04-03 | 2010-07-21 | 이재호 | 상하 각각 이중 앵커리지 기능을 갖는 전단보강재 |
US8844224B2 (en) | 2012-04-30 | 2014-09-30 | James Scot LINDQUIST | Utility dowel bracket |
GB2504720B (en) * | 2012-08-07 | 2014-07-16 | Laing O Rourke Plc | Joints between precast concrete elements |
JP6792776B2 (ja) * | 2017-09-19 | 2020-12-02 | 株式会社小野工業所 | 鉄筋 |
JP6792775B2 (ja) * | 2017-09-19 | 2020-12-02 | 株式会社小野工業所 | 鉄筋 |
US11959270B1 (en) * | 2021-04-16 | 2024-04-16 | Morse Distribution, Inc. | Stud rail systems and methods for use in reinforced concrete structures |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE173118C (de) * | ||||
CH209591A (de) * | 1938-02-28 | 1940-04-30 | Isteg Ernst Hoffmann & Co Komm | Eisenbetonkörper. |
GB646708A (en) * | 1945-03-23 | 1950-11-29 | Eugene Freyssinet | A reinforcement for use in connection with pre-stressed concrete |
DE1077854B (de) * | 1955-08-02 | 1960-03-17 | Hermann Donath | Bewehrungsstab fuer Beton, insbesondere fuer Spannbeton |
DE1077845B (de) * | 1958-04-03 | 1960-03-17 | Kleindienst & Co | Personenfahrstuhl |
DE1171944B (de) * | 1961-10-23 | 1964-06-11 | Peco Verkaufsgesellschaft M B | Verbundkonstruktion |
DE2727159C3 (de) * | 1977-06-16 | 1980-05-08 | 7000 Stuttgart | Schubbewehrung für auf Betonstützen aufgelagerte Flachdecken aus Stahl- oder Spannbeton |
CA1085642A (en) * | 1978-02-28 | 1980-09-16 | Amin Ghali | Shear reinforcement for concrete flat slabs |
US4233364A (en) * | 1979-05-15 | 1980-11-11 | Van Thiel's Draadindustrie (Thibodraad) B.V. | Anchoring fibre for use in concrete |
DE3003025C2 (de) * | 1980-01-29 | 1984-07-05 | Hochtief Ag Vorm. Gebr. Helfmann, 4300 Essen | Verfahren zum Herstellen eines mit einem Gewindeabschnitt ausgerüsteten Bewehrungselementes |
DE3015407C2 (de) * | 1980-04-22 | 1985-05-15 | Andrä, Wolfhart, Dr.-Ing., 7000 Stuttgart | Bewehrungselement zur Übertragung von Querkräften in plattenartigen Traggliedern, z.B. Flachdecken |
EP0318712B1 (de) * | 1987-11-30 | 1992-01-22 | Riss AG | Verbindungsvorrichtung zum Anschliessen einer Betondecke an eine Stütze sowie Bauwerk |
DE3816930A1 (de) * | 1988-05-11 | 1989-11-23 | Heribert Hiendl | Rueckbiegefaehiger betonstahl |
EP0326157B1 (de) * | 1988-01-29 | 1993-12-08 | Heribert Hiendl | Rückbiegefähiger Betonstahl |
CH683545A5 (de) * | 1991-01-18 | 1994-03-31 | Thomas Moesch | Schubbewehrung für Flachdecken. |
DE4129903A1 (de) * | 1991-09-09 | 1993-03-11 | Deha Ankersysteme | Duebelleiste |
CA2165848C (en) * | 1995-12-21 | 1999-03-30 | Amin Ghali | Stud-trough reinforcing system for structural concrete |
-
1994
- 1994-04-13 DE DE4412598A patent/DE4412598A1/de not_active Withdrawn
-
1995
- 1995-03-10 WO PCT/EP1995/000891 patent/WO1995028534A1/de active IP Right Grant
- 1995-03-10 EP EP95911320A patent/EP0755473B1/de not_active Expired - Lifetime
- 1995-03-10 CA CA002187797A patent/CA2187797A1/en not_active Abandoned
- 1995-03-10 AT AT95911320T patent/ATE195990T1/de not_active IP Right Cessation
- 1995-03-10 JP JP7526651A patent/JPH09512068A/ja not_active Ceased
- 1995-03-10 DK DK95911320T patent/DK0755473T3/da active
- 1995-03-10 ES ES95911320T patent/ES2150557T3/es not_active Expired - Lifetime
- 1995-03-10 US US08/727,644 patent/US5867960A/en not_active Expired - Fee Related
- 1995-03-10 DE DE59508686T patent/DE59508686D1/de not_active Expired - Fee Related
-
1996
- 1996-10-11 NO NO964340A patent/NO300786B1/no unknown
-
2000
- 2000-11-24 GR GR20000402609T patent/GR3034986T3/el not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9528534A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4412598A1 (de) | 1995-10-19 |
NO300786B1 (no) | 1997-07-21 |
EP0755473B1 (de) | 2000-08-30 |
GR3034986T3 (en) | 2001-02-28 |
WO1995028534A1 (de) | 1995-10-26 |
JPH09512068A (ja) | 1997-12-02 |
CA2187797A1 (en) | 1995-10-26 |
NO964340D0 (no) | 1996-10-11 |
ES2150557T3 (es) | 2000-12-01 |
ATE195990T1 (de) | 2000-09-15 |
NO964340L (no) | 1996-12-13 |
US5867960A (en) | 1999-02-09 |
DE59508686D1 (de) | 2000-10-05 |
DK0755473T3 (da) | 2001-01-22 |
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