EP0954657A1 - Concrete pillar - Google Patents

Concrete pillar

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Publication number
EP0954657A1
EP0954657A1 EP98905315A EP98905315A EP0954657A1 EP 0954657 A1 EP0954657 A1 EP 0954657A1 EP 98905315 A EP98905315 A EP 98905315A EP 98905315 A EP98905315 A EP 98905315A EP 0954657 A1 EP0954657 A1 EP 0954657A1
Authority
EP
European Patent Office
Prior art keywords
flat
column
support according
concrete
concrete support
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
Application number
EP98905315A
Other languages
German (de)
French (fr)
Other versions
EP0954657B1 (en
Inventor
Alexander Bleibler
Werner Steiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sika Schweiz AG
Original Assignee
Sika AG
Sika AG Vorm Kaspar Winkler and Co
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 Sika AG, Sika AG Vorm Kaspar Winkler and Co filed Critical Sika AG
Publication of EP0954657A1 publication Critical patent/EP0954657A1/en
Application granted granted Critical
Publication of EP0954657B1 publication Critical patent/EP0954657B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
    • 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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements

Definitions

  • the invention relates to a concrete column, in particular a round column made of reinforced concrete, with a column foot connected to a foundation, a column head receiving a load element and optionally a steel reinforcement embedded in the column interior.
  • Columns are vertical components, the height or length of which is large in relation to their cross-sectional dimensions.
  • the supports serve other components, such as beams or beams, as supports and guide their loads into the foundation. This mainly results in compressive stress in the longitudinal direction of the column. Supports can also be subjected to bending loads by horizontal loads such as wind loads, impact loads or seismic movements. With slender supports there is an additional risk of buckling. Depending on the type of production, regardless of the load and the risk of buckling, minimum thicknesses are specified for supports.
  • the guidelines specified in DIN 1045 apply to the reinforcement of columns. If there is a risk of high impact loads and seismic movements, these guidelines are often not sufficient for a kink-proof design of reinforced concrete columns.
  • the object of the invention is to develop a concrete support with high buckling protection, which is also able to withstand high horizontal forces and seismic movements.
  • a flat surface extending between the column base and column head in the form of a helix extends over the column surface.
  • proposed band which has a composite structure of a plurality of substantially parallel aligned support fibers and a binding matrix connecting the support fibers in a shear-resistant manner and is fastened to the support surface with one broad side surface by means of an adhesive, the pitch of the helix being greater than the bandwidth of the flat strip is.
  • the pitch is dimensioned so that no closed space can form between the flat belt and the column surface, from which any water that might enter could no longer escape.
  • the pitch of the helix accordingly corresponds to approximately 1.1 to 5 times, preferably 1.5 to 2.5 times the flat bandwidth.
  • the flat strip is expediently secured to the support surface by means of at least one fastening element each, so that it cannot detach from the ends.
  • a plurality of flat strips which surround the support in the manner of a tire and are fastened to the surface of the support by means of an adhesive, are arranged at a distance from one another between the support foot and the support head, the flat strips comprising a plurality of carrier fibers which are oriented essentially parallel to one another and one which is resistant to shear have interconnecting binder matrix.
  • the flat strips' are secured with overlapping ends to the binder matrix.
  • the distance between the flat strips is such that can not form gesche ⁇ ner gap between the flat bands and supporting surface from which may eindringen- the water could no longer escape. Accordingly, the distance between the flat strips corresponds to 0.1 to 4 times, preferably 0.5 to 1.5 times the flat strip width.
  • the flat strips expediently have an embossed bend in their intermediate regions guided over the edge of the supports.
  • This bend can be produced in that the flat strips in the areas concerned are freed of their binder matrix with exposure of the supporting fibers and can be acted upon with a pasty, curable synthetic resin replacing the binder matrix.
  • a further increase in the kink protection can be achieved according to a preferred embodiment of the invention in that additional flat strips are provided, which cross the spiral-shaped or ring-shaped flat strips at a distance from one another and are attached to the support surface and / or to the existing flat strips by means of an adhesive.
  • the carrier fibers of the flat strip advantageously consist of carbon fibers, which are characterized by a high modulus of elasticity.
  • flat ribbons with aramid, glass or polypropylene fibers or with a mixture of the fibers mentioned can also be used.
  • reaction resin such as epoxy resin, polyurethane, acrylic resin or polyester resin is expediently used as the binder.
  • the adhesive also expediently consists of a reaction resin of the type mentioned.
  • the reinforced concrete column wrapped with the flat strip can also be plastered or coated with a protective coating so that the reinforcement measure is no longer visible from the outside.
  • Figure 1 is designed as a building support round support with helical flat ribbon wrapping.
  • FIG. 3 shows a building support with a tire-like flat band wrapping
  • FIG. 4a and b show a section through the structural support according to FIG. 3, which is designed as a square support and as a round support;
  • 5a and b show a top view and a side view of a reinforcing lamella with a binder-free, flexible intermediate area
  • Fig. 6 is a concrete column with cross and transverse ribbon tape.
  • the concrete supports 10 shown in FIGS. 1, 3 and 5 have a support foot 12 embedded in a foundation 11 and a support head 16 designed as a support for a component '14 .
  • the concrete column 10 can contain an internal steel reinforcement 17 (FIGS. 4a and b).
  • the support is wrapped with a flat strip 18 (FIG. 1) or with flat strips 18 ', 18''.
  • the pitch h of the flat coil is larger than the bandwidth b. In the exemplary embodiment shown, it corresponds to approximately 1.5 times the flat strip width b.
  • the gaps 22 between the flat ribbon windings ensure that no coherent, closed cavity can form between the flat ribbon and the support surface, in which water could accumulate.
  • a plurality of flat strips 18 ′ which surround the support in an annular manner and are fastened to the surface of the support by means of an adhesive are provided, which are arranged at a distance a from one another, which in the exemplary embodiment shown is approximately 0.5 times the flat band width b.
  • the ring-shaped flat bands encompass the support with ends 24 that overlap one another (FIG. 3).
  • these flat strips 18' ' which cross at an angle of 90 ° are provided, which are arranged at a distance from one another, so that gaps 22 for the evaporation of water are also present in this case remain free.
  • the flat strips consist of a composite structure of a plurality of parallel aligned, vorzugswei ⁇ se of carbon existing support fibers 26 and the reinforcing fibers are shear firmly interconnecting Bindeffenma ⁇ trix 28 is preferably made of epoxy resin.
  • the supports 10 can have either a rectangular or round cross section. In the case of Rectangular cross-section according to FIG.
  • the flat strips are expediently provided with an embossed bend 32 in their area overlapping the edges 30, which can be produced by the flat strip 18 'being freed from its binder matrix 28 in the area in question, exposing the limp support fibers 26 and that after the support has been wrapped, the area in question is acted upon by a pasty, curable synthetic resin which replaces the binder matrix (FIGS. 5a and b).
  • the invention relates to a concrete column, in particular a round column made of reinforced concrete with a column base 12, a column head 16 and, if appropriate, a steel reinforcement arranged in the column interior.
  • a flat strip 18 is provided between the column foot 12 and the column head 16 in the form of a helix and extends over the column surface Show binder matrix.
  • the flat strip 18 is fastened to the support surface on one broad side by means of an adhesive.
  • the pitch h of the flat ribbon helix is chosen to be greater than the bandwidth b of the flat ribbon 18.

Abstract

The invention relates to a concrete pillar, in particular a circular pillar made of reinforced concrete with a pillar base (12), a pillar top (16) and, optionally, a steel reinforcement fitted inside the pillar. In order to enhance flectional and buckling resistance, a flat strip (18) in the form of a helix is provided between the pillar base (12) and pillar top (16), extending over the pillar surface, and having a composite structure consisting of a plurality of substantially parallel-aligned carbon fibres, and a binder matrix which shear-resistantly binds the carbon fibres to each other. The flat strip (18) is attached to the pillar surface by one of its broad sides by means of an adhesive. The lead (h) of the flat strip helix is thus greater than the width (b) of the flat strip (18).

Description

BetonstützeConcrete column
Beschreibungdescription
Die Erfindung betrifft eine Betonstütze, insbesondere eine Rundstütze aus Stahlbeton, mit einem mit einem Fundament verbundenen Stützenfuß, einem ein Lastelement aufnehmenden Stützenkopf sowie gegebenenfalls einer im Stützeninneren eingebetteten Stahlbewehrung.The invention relates to a concrete column, in particular a round column made of reinforced concrete, with a column foot connected to a foundation, a column head receiving a load element and optionally a steel reinforcement embedded in the column interior.
Stützen sind lotrecht stehende Bauteile, deren Höhe oder Länge im Verhältnis zu ihren Querschnittsabmessungen groß ist. Die Stützen dienen anderen Bauteilen, wie Balken oder Unterzügen als Auflager und leiten deren Lasten in das Fun- dament . Dabei ergibt sich vorwiegend eine Druckbeanspruchung in Stützenlängsrichtung. Stützen können ferner durch Horizontallasten, wie Windlasten, Anprallasten oder seismische Bewegungen auf Biegung beansprucht werden. Bei schlanken Stützen besteht zusätzlich die Gefahr des Ausknickens . Je nach Art der Herstellung sind unabhängig von der Belastung und der Knickgefahr Mindestdicken für Stützen vorgeschrieben. Für die Bewehrung von Stützen gelten die in DIN 1045 festgelegten Richtlinien. Bei der Gefahr hoher AnprallLasten und seismischer Bewegungen reichen diese Richtlinien für ei- ne knicksichere Auslegung von Stahlbetonstützen jedoch häufig nicht aus.Columns are vertical components, the height or length of which is large in relation to their cross-sectional dimensions. The supports serve other components, such as beams or beams, as supports and guide their loads into the foundation. This mainly results in compressive stress in the longitudinal direction of the column. Supports can also be subjected to bending loads by horizontal loads such as wind loads, impact loads or seismic movements. With slender supports there is an additional risk of buckling. Depending on the type of production, regardless of the load and the risk of buckling, minimum thicknesses are specified for supports. The guidelines specified in DIN 1045 apply to the reinforcement of columns. If there is a risk of high impact loads and seismic movements, these guidelines are often not sufficient for a kink-proof design of reinforced concrete columns.
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, eine Betonstütze mit hoher Ausknicksicherung zu entwickeln, die auch hohen Horizontalkräften und seismischen Bewegungen standzuhalten vermag.Proceeding from this, the object of the invention is to develop a concrete support with high buckling protection, which is also able to withstand high horizontal forces and seismic movements.
Zur Lösung dieser Aufgabe wird gemäß einer ersten Alternative ein sich zwischen Stützenfuß und Stützenkopf in Form ei- ner Wendel über die Stützenoberfläche erstreckendes Flach- band vorgeschlagen, das eine Verbundstruktur aus einer Vielzahl von im wesentlichen parallel zueinander ausgerichteten Tragfasern und einer die Tragfasern schubfest miteinander verbindenden Bindemittelmatrix aufweist und mit seiner einen Breitseitenfläche mittels eines Klebers an der Stützenoberfläche befestigt ist, wobei die Ganghöhe der Wendel größer als die Bandbreite des Flachbandes ist. Die Ganghöhe ist so bemessen, daß sich zwischen Flachband und Stützenoberfläche kein geschlossener Zwischenraum bilden kann, aus dem even- tuell eindringendes Wasser nicht mehr entweichen könnte. Die Ganghöhe der Wendel entspricht dementsprechend etwa dem 1,1- bis 5-fachen, vorzugsweise dem 1,5- bis 2,5-fachen der Flachbandbreite. An seinen Enden ist das Flachband zweckmäßig an der Stützenoberfläche mittels je mindestens eines Be- festigungselements gesichert, so daß es sich nicht von den Enden aus ablösen kann.To achieve this object, according to a first alternative, a flat surface extending between the column base and column head in the form of a helix extends over the column surface. proposed band, which has a composite structure of a plurality of substantially parallel aligned support fibers and a binding matrix connecting the support fibers in a shear-resistant manner and is fastened to the support surface with one broad side surface by means of an adhesive, the pitch of the helix being greater than the bandwidth of the flat strip is. The pitch is dimensioned so that no closed space can form between the flat belt and the column surface, from which any water that might enter could no longer escape. The pitch of the helix accordingly corresponds to approximately 1.1 to 5 times, preferably 1.5 to 2.5 times the flat bandwidth. At its ends, the flat strip is expediently secured to the support surface by means of at least one fastening element each, so that it cannot detach from the ends.
Gemäß einer zweiten Lösungsalternative sind zwischen dem Stützenfuß und dem Stützenkopf mehrere, die Stütze reifenar- tig umfassende, mittels eines Klebers an der Stützenoberfläche befestigte Flachbänder im Abstand voneinander angeordnet, wobei die Flachbänder eine Vielzahl von im wesentlichen parallel zueinander ausgerichtete Tragfasern und eine die Tragfasern schubfest miteinander verbindende Bindemittelma- trix aufweisen. Die Flachbänder' sind dabei mit einander überlappenden Enden an der Bindemittelmatrix befestigt. Der Abstand zwischen den Flachbändern ist so bemessen, daß sich zwischen Flachbändern und Stützenoberfläche kein geschlosse¬ ner Zwischenraum bilden kann, aus dem eventuell eindringen- des Wasser nicht mehr entweichen könnte. Der Abstand zwischen den Flachbändern entspricht dementsprechend dem 0,1- bis 4 -fachen, vorzugsweise dem 0,5- bis 1,5- fachen der Flachbandbreite .According to a second alternative solution, a plurality of flat strips, which surround the support in the manner of a tire and are fastened to the surface of the support by means of an adhesive, are arranged at a distance from one another between the support foot and the support head, the flat strips comprising a plurality of carrier fibers which are oriented essentially parallel to one another and one which is resistant to shear have interconnecting binder matrix. The flat strips' are secured with overlapping ends to the binder matrix. The distance between the flat strips is such that can not form geschlosse ¬ ner gap between the flat bands and supporting surface from which may eindringen- the water could no longer escape. Accordingly, the distance between the flat strips corresponds to 0.1 to 4 times, preferably 0.5 to 1.5 times the flat strip width.
Bei im Querschnitt rechteckigen oder quadratischen Beton- stützen weisen die Flachbänder zweckmäßig in ihren über die Stützenkanten geführten Zwischenbereichen eine aufgeprägte Biegung auf. Diese Biegung kann dadurch erzeugt werden, daß die Flachbänder in den betreffenden Bereichen von ihrer Bin- demittelmatrix unter Freilegung der Tragfasern befreit und mit einem die Bindemittelmatrix ersetzenden pastosen, aus- härtbaren Kunstharz beaufschlagbar sind.In the case of concrete with a rectangular or square cross section supports the flat strips expediently have an embossed bend in their intermediate regions guided over the edge of the supports. This bend can be produced in that the flat strips in the areas concerned are freed of their binder matrix with exposure of the supporting fibers and can be acted upon with a pasty, curable synthetic resin replacing the binder matrix.
Eine weitere Erhöhung der Knicksicherung kann gemäß einer bevorzugten Ausgestaltung der Erfindung dadurch erzielt werden, daß zusätzliche, die wendeiförmig oder ringförmig angeordneten Flachbänder im Abstand voneinander überkreuzende, mittels eines Klebers an der Stützenoberfläche und/oder an den vorhandenen Flachbändern befestigte Flachbänder vorgese- hen sind.A further increase in the kink protection can be achieved according to a preferred embodiment of the invention in that additional flat strips are provided, which cross the spiral-shaped or ring-shaped flat strips at a distance from one another and are attached to the support surface and / or to the existing flat strips by means of an adhesive.
Die Tragfasern des Flachbandes bestehen vorteilhafterweise aus Kohlenstoffasern, die sich durch einen hohen Elastizitätsmodul auszeichnen. Grundsätzlich können auch Flachbänder mit Aramid- , Glas- oder Polypropylenfasern oder mit einem Gemisch aus den genannten Fasern verwendet werden.The carrier fibers of the flat strip advantageously consist of carbon fibers, which are characterized by a high modulus of elasticity. Basically, flat ribbons with aramid, glass or polypropylene fibers or with a mixture of the fibers mentioned can also be used.
Als Bindemittel wird zweckmäßig ein Reaktionsharz, wie Epoxidharz, Polyurethan, Acrylharz oder Polyesterharz verwen- det. Um eine stabile Anbindung des Flachbands an die Stützenoberfläche zu gewährleisten, besteht auch der Kleber zweckmäßig aus einem Reaktionsharz der genannten Art.A reaction resin such as epoxy resin, polyurethane, acrylic resin or polyester resin is expediently used as the binder. In order to ensure a stable connection of the flat strip to the support surface, the adhesive also expediently consists of a reaction resin of the type mentioned.
Die mit dem Flachband umwickelte Stahlbetonstütze kann zu- sätzlich verputzt oder mit einem Schutzanstrich versehen werden, so daß die Bewehrungsmaßnahme von außen nicht mehr sichtbar ist.The reinforced concrete column wrapped with the flat strip can also be plastered or coated with a protective coating so that the reinforcement measure is no longer visible from the outside.
Im folgenden wird die Erfindung anhand eines in der Zeich- nung in schematischer Weise dargestellten Ausführungsbei - spiels näher erläutert. Es zeigenIn the following, the invention is explained on the basis of an exemplary embodiment shown schematically in the drawing. explained in more detail. Show it
Fig. 1 eine als Bauwerkstütze ausgebildete Rundstütze mit wendeiförmiger Flachbandumwicklung;Figure 1 is designed as a building support round support with helical flat ribbon wrapping.
Fig. 2a und b einen Flachbandabschnitt in Draufsicht und in Seitenansicht;2a and b a flat strip section in plan view and in side view;
Fig. 3 eine Bauwerkstütze mit reifenartiger Flachbandum- wicklung;3 shows a building support with a tire-like flat band wrapping;
Fig. 4a und b einen Schnitt durch die als Vierkantstütze und als Rundstütze ausgebildete Bauwerkstütze nach Fig. 3;4a and b show a section through the structural support according to FIG. 3, which is designed as a square support and as a round support;
Fig. 5a und b eine Draufsicht und eine Seitenansicht einer Verstärkungslamelle mit bindemittelfreiem, biegsamem Zwischenbereich;5a and b show a top view and a side view of a reinforcing lamella with a binder-free, flexible intermediate area;
Fig. 6 eine Betonstütze mit kreuz- und querverlaufender Flachbandumwicklung .Fig. 6 is a concrete column with cross and transverse ribbon tape.
Die in Fig. 1, 3 und 5 dargestellten Betonstützen 10 weisen einen in ein Fundament 11 eingebetteten Stützenfuß 12 und einen als Auflager für ein Bauteil' 14 ausgebildeten Stützenkopf 16 auf. Die Betonstütze 10 kann eine interne Stahlbewehrung 17 enthalten (Fig. 4a und b) . Zur weiteren Verstärkung gegen ein Ausbiegen oder Ausknicken ist die Stütze mit einem Flachband 18 (Fig. 1) oder mit Flachbändern 18', 18'' umwickelt.The concrete supports 10 shown in FIGS. 1, 3 and 5 have a support foot 12 embedded in a foundation 11 and a support head 16 designed as a support for a component '14 . The concrete column 10 can contain an internal steel reinforcement 17 (FIGS. 4a and b). For further reinforcement against bending out or buckling, the support is wrapped with a flat strip 18 (FIG. 1) or with flat strips 18 ', 18''.
Im Falle der Fig. 1 erstreckt sich das Flachband 18 vomIn the case of Fig. 1, the ribbon 18 extends from
Stützenfuß 12 bis zum Stützenkopf 16 wendeiförmig über dieColumn foot 12 up to the column head 16 helically over the
Stützenoberfläche und ist an dieser mit einem Epoxidharzkle- ber 19 flächig befestigt. Die freien Bandenden sind durch laschenförmige Befestigungselemente 20 an der Stütze festgelegt. Die Ganghöhe h der Flachbandwendel ist dabei größer als die Bandbreite b. Sie entspricht bei dem gezeigten Aus- führungsbeispiel etwa dem 1,5 -fachen der Flachbandbreite b. Die Lücken 22 zwischen den Flachbandwindungen sorgen dafür, daß sich zwischen dem Flachband und der Stützenoberfläche kein zusammenhängender geschlossener Hohlraum ausbilden kann, in dem sich Wasser ansammeln könnte.Support surface and is attached to it with an epoxy resin 19 surface. The free band ends are through tab-shaped fasteners 20 set on the support. The pitch h of the flat coil is larger than the bandwidth b. In the exemplary embodiment shown, it corresponds to approximately 1.5 times the flat strip width b. The gaps 22 between the flat ribbon windings ensure that no coherent, closed cavity can form between the flat ribbon and the support surface, in which water could accumulate.
Bei dem in Fig. 3 gezeigten Ausführungsbeispiel sind eine Mehrzahl von die Stütze ringförmig umfassenden, mittels eines Klebers an der Stützenoberfläche befestigten Flachbändern 18' vorgesehen, die in einem Abstand a voneinander angeordnet sind, der bei dem gezeigten Ausführungsbeispiel et- wa dem 0,5 -fachen der Flachbandbreite b entspricht. Die Lücken 22 zwischen den Flachbandringen 18' sorgen dafür, daß sich zwischen dem Flachband und der Stützenoberfläche kein zusammenhängender geschlossener Hohlraum ausbilden kann, in dem sich Wasser ansammeln könnte. Die ringförmigen Flachbän- der umgreifen die Stütze mit einander überlappenden Enden 24 (Fig. 3) .In the exemplary embodiment shown in FIG. 3, a plurality of flat strips 18 ′ which surround the support in an annular manner and are fastened to the surface of the support by means of an adhesive are provided, which are arranged at a distance a from one another, which in the exemplary embodiment shown is approximately 0.5 times the flat band width b. The gaps 22 between the flat band rings 18 'ensure that no coherent closed cavity can form between the flat band and the support surface, in which water could accumulate. The ring-shaped flat bands encompass the support with ends 24 that overlap one another (FIG. 3).
Bei dem in Fig. 6 gezeigten Ausführungsbeispiel sind zusätzlich zu den ringförmigen Flachbändern 18' diese unter einem Winkel von 90° kreuzende Flachbänder 18'' vorgesehen, die im Abstand voneinander angeordnet sind, so daß auch in diesem Fall Lücken 22 für das Abdampfen von Wasser frei bleiben.In the embodiment shown in FIG. 6, in addition to the annular flat strips 18 ', these flat strips 18' 'which cross at an angle of 90 ° are provided, which are arranged at a distance from one another, so that gaps 22 for the evaporation of water are also present in this case remain free.
Die Flachbänder bestehen aus einer Verbundstruktur aus einer Vielzahl von parallel zueinander ausgerichteten, vorzugswei¬ se aus Kohlenstoff bestehenden Tragfasern 26 und einer die Tragfasern schubfest miteinander verbindenden Bindemittelma¬ trix 28 vorzugsweise aus Epoxidharz. Wie aus Fig. 4a und b zu ersehen ist, können die Stützen 10 entweder einen recht - eckigen oder runden Querschnitt aufweisen. Im Falle des rechteckigen Querschnitts nach Fig. 4a werden die Flachbänder in ihrem die Kanten 30 übergreifenden Bereich zweckmäßig mit einer aufgeprägten Biegung 32 versehen, die dadurch erzeugt werden kann, daß das Flachband 18' in dem betreffenden Bereich von seiner Bindemittelmatrix 28 unter Freilegung der biegeschlaffen Tragfasern 26 befreit wird und daß nach dem Umwickeln der Stütze der betreffende Bereich mit einem die Bindemittelmatrix ersetzenden pastösen, aushärtbaren Kunstharz beaufschlagt wird (Fig. 5a und b) .The flat strips consist of a composite structure of a plurality of parallel aligned, vorzugswei ¬ se of carbon existing support fibers 26 and the reinforcing fibers are shear firmly interconnecting Bindemittelma ¬ trix 28 is preferably made of epoxy resin. As can be seen from FIGS. 4a and b, the supports 10 can have either a rectangular or round cross section. In the case of Rectangular cross-section according to FIG. 4a, the flat strips are expediently provided with an embossed bend 32 in their area overlapping the edges 30, which can be produced by the flat strip 18 'being freed from its binder matrix 28 in the area in question, exposing the limp support fibers 26 and that after the support has been wrapped, the area in question is acted upon by a pasty, curable synthetic resin which replaces the binder matrix (FIGS. 5a and b).
Zusammenfassend ist folgendes festzustellen: Die Erfindung bezieht sich auf eine Betonstütze, insbesondere eine Rundstütze aus Stahlbeton mit einem Stützenfuß 12, einem Stützenkopf 16 sowie gegebenenfalls einer im Stützeninneren an- geordneten Stahlbewehrung. Zur Erhöhung der Biege- und Knickfestigkeit ist ein sich zwischen Stützenfuß 12 und Stützenkopf 16 in Form einer Wendel über die Stützenoberfläche erstreckendes Flachband 18 vorgesehen, das eine Verbundstruktur aus einer Vielzahl von im wesentlichen parallel zu- einander ausgerichteten Kohlenstoffasern und einer die Kohlenstoffasern schubfest miteinander verbindenden Bindemittelmatrix aufweise. Das Flachband 18 ist an seiner einen Breitseite mittels eines Klebers an der Stützenoberfläche befestigt. Die Ganghöhe h der Flachbandwendel ist dabei grö- ßer als die Bandbreite b des Flachbandes 18 gewählt. In summary, the following can be stated: The invention relates to a concrete column, in particular a round column made of reinforced concrete with a column base 12, a column head 16 and, if appropriate, a steel reinforcement arranged in the column interior. To increase the bending and buckling strength, a flat strip 18 is provided between the column foot 12 and the column head 16 in the form of a helix and extends over the column surface Show binder matrix. The flat strip 18 is fastened to the support surface on one broad side by means of an adhesive. The pitch h of the flat ribbon helix is chosen to be greater than the bandwidth b of the flat ribbon 18.

Claims

Patentansprüche claims
1. Betonstütze mit einem Stützenfuß (12), einem Stützenkopf1. Concrete column with a column foot (12), a column head
(16) sowie gegebenenfalls einer im Stützeninneren ange- ordneten Stahlbewehrung (17) , gekennzeichnet durch ein sich zwischen dem Stützenfuß (12) und dem Stützenkopf (16) in Form einer Wendel über die Stützenoberfläche erstreckendes Flachband (18) , das eine Verbundstruktur aus einer Vielzahl von im wesentlichen parallel zueinander ausgerichteten Tragfasern und einer die Tragfasern schubfest miteinander verbindenden Bindemittelmatrix aufweist, und das mit seiner einen Breitseite mittels eines Klebers an der Stützenoberfläche befestigt ist, wobei die Ganghöhe (h) der Wendel größer als die Band- breite (b) des Flachbandes (18) ist.(16) and optionally a steel reinforcement (17) arranged in the interior of the column, characterized by a flat strip (18) extending between the column base (12) and the column head (16) in the form of a spiral over the column surface, which has a composite structure made of a Has a plurality of carrier fibers aligned essentially parallel to one another and a binder matrix which connects the carrier fibers in a shear-resistant manner, and which is fastened to the support surface with one broad side by means of an adhesive, the pitch (h) of the helix being greater than the bandwidth (b) of the flat belt (18).
2. Betonstütze nach Anspruch 1, dadurch gekennzeichnet, daß das Flachband (18) an seinen freien Enden an der Stützenoberfläche mittels je eines Befestigungselements (20) festgelegt ist.2. Concrete support according to claim 1, characterized in that the flat strip (18) is fixed at its free ends to the support surface by means of a fastening element (20).
3. Betonstütze nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ganghöhe (h) der Wendel dem 1,1- bis 5-fa- chen, vorzugsweise dem 1,5- bis 2,5-fachen der Flach- bandbreite (b) entspricht.3. Concrete support according to claim 1 or 2, characterized in that the pitch (h) of the helix 1.1 to 5 times, preferably 1.5 to 2.5 times the flat band width (b ) corresponds.
4. Betonstütze mit einem Stützenfuß (12), einem Stützenkopf (16) sowie gegebenenfalls einer im Stützeninneren angeordneten Stahlbewehrung (17) , dadurch gekennzeichnet, daß zwischen dem Stützenfuß (12) und dem Stützenkopf (16) mehrere die Stütze reifenartig umfassende, mittels eines Klebers (19) an der Stützenoberfläche befestigte Flachbänder (18') im Abstand voneinander angeordnet sind, wobei die Flachbänder (18') eine Vielzahl von im wesentlichen parallel zueinander ausgerichtete Tragfa- sern (26) und eine die Tragfasern (26) schubfest miteinander verbindende Bindemittelmatrix (28) aufweisen.4. Concrete column with a column base (12), a column head (16) and optionally a steel reinforcement (17) arranged in the column interior, characterized in that between the column base (12) and the column head (16) several encompassing the column tire-like by means of a Adhesive (19) on the support surface flat tapes (18 ') are arranged at a distance from each other, the flat tapes (18') a plurality of substantially parallel to each other star (26) and a binder matrix (28) connecting the supporting fibers (26) in a shear-resistant manner.
5. Betonstütze nach Anspruch 4, dadurch gekennzeichnet, daß die Flachbänder (18') mit einander überlappenden Enden5. Concrete support according to claim 4, characterized in that the flat strips (18 ') with overlapping ends
(24) an der Stütze (10) befestigt sind.(24) are attached to the support (10).
6. Betonstütze nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Abstand (a) zwischen den Flachbändern (18') dem 0,1- bis 4-fachen, vorzugsweise dem 0,5- bis 1,5-fa- chen der Flachbandbreite (b) entspricht.6. Concrete support according to claim 4 or 5, characterized in that the distance (a) between the flat strips (18 ') 0.1 to 4 times, preferably 0.5 to 1.5 times that Corresponds to flat band width (b).
7. Betonstütze nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß zusätzliche, die wendeiförmig oder ringförmig angeordneten Flachbänder (18,18') im Abstand voneinander überkreuzende, mittels eines Klebers (19) an der Stützenoberfläche und/oder an den vorhandenen Flachbändern (18,18') befestigte Flachbänder (18'') vorgesehen sind.7. Concrete support according to one of claims 1 to 6, characterized in that additional, the helically or annularly arranged flat strips (18,18 ') crossing at a distance from each other, by means of an adhesive (19) on the support surface and / or on the existing flat strips (18, 18 ') fixed flat strips (18' ') are provided.
Betonstütze nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Flachbänder (18,18', 18'') in ihren über Stützenkanten (30) geführten Zwischenbereichen eine aufgeprägte Biegung (32) aufweisen.Concrete support according to one of claims 1 to 7, characterized in that the flat strips (18, 18 ', 18' ') have an embossed bend (32) in their intermediate regions guided over the support edges (30).
9. Betonstütze nach Anspruch 8, dadurch gekennzeichnet, daß die Flachbänder (18') im Bereich der aufgeprägten Biegung (32) von ihrer Bindemittelmatrix (28) unter Freilegung der Tragfasern (26) befreit und mit einem die Bin- demittelmatrix ersetzenden pastösen, aushärtbaren Kunstharz beaufschlagbar sind.9. Concrete support according to claim 8, characterized in that the flat strips (18 ') in the region of the embossed bend (32) are freed from their binder matrix (28) with exposure of the supporting fibers (26) and with a pasty, curable substitute for the binder matrix Resin can be applied.
10. Betonstütze nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Tragfasern als Kohlenstoffasern ausgebildet sind. 10. Concrete support according to one of claims 1 to 9, characterized in that the supporting fibers are designed as carbon fibers.
11. Betonstütze nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Bindemittelmatrix aus einem Reaktionsharz, insbesondere aus Epoxidharz besteht.11. Concrete support according to one of claims 1 to 10, characterized in that the binder matrix consists of a reaction resin, in particular of epoxy resin.
12. Betonstütze nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß der Kleber aus einem Reaktionsharz, insbesondere aus Epoxidharz besteht.12. Concrete support according to one of claims 1 to 11, characterized in that the adhesive consists of a reactive resin, in particular of epoxy resin.
13. Betonstütze nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß die mit dem Flachband (18) umwickelte Stützenoberfläche verputzt oder mit einem Schutzanstrich versehen ist. 13. Concrete support according to one of claims 1 to 12, characterized in that the support surface wrapped with the flat strip (18) is plastered or provided with a protective coating.
EP98905315A 1997-01-23 1998-01-20 Concrete pillar Expired - Lifetime EP0954657B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19702247A DE19702247A1 (en) 1997-01-23 1997-01-23 Concrete column
DE19702247 1997-01-23
PCT/EP1998/000271 WO1998032932A1 (en) 1997-01-23 1998-01-20 Concrete pillar

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EP0954657A1 true EP0954657A1 (en) 1999-11-10
EP0954657B1 EP0954657B1 (en) 2003-04-09

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EP (1) EP0954657B1 (en)
JP (1) JP2000513060A (en)
KR (1) KR100348767B1 (en)
AT (1) ATE237048T1 (en)
AU (1) AU738483B2 (en)
CA (1) CA2278462A1 (en)
DE (2) DE19702247A1 (en)
ES (1) ES2193516T3 (en)
WO (1) WO1998032932A1 (en)

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TR200102956T2 (en) * 1998-03-24 2002-06-21 University Of Ottawa Renewal of existing concrete columns by applying external pressure.
JP3484156B2 (en) * 1999-12-27 2004-01-06 構造品質保証研究所株式会社 Building reinforcement method and structure
AUPR745001A0 (en) * 2001-09-04 2001-09-27 John Holland Pty Ltd A method for reinforcing poles
EP1411185B1 (en) * 2002-10-14 2013-04-10 SAG Energieversorgungslösungen GmbH Method to retrofit concrete masts
US7562499B2 (en) 2006-01-13 2009-07-21 HC Bridge Company, LLC Hybrid composite beam system
JP2008063744A (en) * 2006-09-05 2008-03-21 Nippon Oil Corp Method for reinforcing existing structure with carbon fiber
JP6058332B2 (en) * 2012-09-25 2017-01-11 東日本旅客鉄道株式会社 Seismic reinforcement structure for concrete column and seismic reinforcement method for concrete column

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US4559974A (en) * 1982-10-01 1985-12-24 Fawley Norman Apparatus and method of arresting ductile fracture propagation
GB8421820D0 (en) * 1984-08-29 1984-10-03 Balfour Beatty Ltd Precast concrete piles
JP2718459B2 (en) * 1990-11-22 1998-02-25 三菱化学株式会社 Reinforcement structure of existing concrete skeleton
US5043033A (en) * 1991-01-28 1991-08-27 Fyfe Edward R Process of improving the strength of existing concrete support columns
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Title
See references of WO9832932A1 *

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AU738483B2 (en) 2001-09-20
AU6095298A (en) 1998-08-18
DE59807863D1 (en) 2003-05-15
JP2000513060A (en) 2000-10-03
WO1998032932A1 (en) 1998-07-30
KR100348767B1 (en) 2002-08-14
ES2193516T3 (en) 2003-11-01
ATE237048T1 (en) 2003-04-15
CA2278462A1 (en) 1998-07-30
EP0954657B1 (en) 2003-04-09
DE19702247A1 (en) 1998-07-30
KR20000070408A (en) 2000-11-25

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