EP2166172A1 - Device for reinforcing a concrete structure against punching around the support area of a floor slab and punching reinforcing element for same - Google Patents

Abstract

The arrangement has a set of anchor elements (14) concreted at a distance to each other in a local zone for supporting ceiling areas in a ceiling and oriented transverse or diagonally bent to a ceiling surface. The anchor elements are aligned along a shear reinforcement element (12), where the anchor element is designed as twin-headed anchor. The shear reinforcement element is designed as metal strips or strut elements that are inclinedly arranged at an angle in an extending direction of the anchor elements.

Description

FIELD OF THE INVENTION

The invention relates to an arrangement for reinforcing a concrete structure against punching in the area of the support of a ceiling element on a support with a plurality of anchor elements and punching shear elements for this purpose. The anchoring elements are embedded in the ceiling at a lateral distance from one another in a near zone at the side of the support ceiling areas and oriented transversely or obliquely inclined to the ceiling surface.

TECHNOLOGICAL BACKGROUND

In a concrete ceiling, such as a building ceiling as a substantially horizontal or slightly inclined component or as a substructure of aufgefelzten, eg traffic engineering Structures such as ramps or bridges for vehicles of any kind or the like occur in the near zone laterally of the support structure, such as a round or polygonal support made of steel or concrete or corresponding wall-like structures, and in particular for stand-alone buttresses puncture risks, ie, that the concrete floor in a near zone demolition and thus collapse is endangered.

There are a number of ways known to reduce the puncture hazard in prop supported concrete structures. This can be done on the one hand by a special reinforcement of the concrete floor in the support area of the support and on the other hand in a broadening of the column head relative to the rest of the column cross-section. A particularly elegant solution for such applications is in FIG. 1 represented, in which a welded frame 1 'made of U-iron with an inner web-like cross 2' in a concrete ceiling 3 'in the region of a columnar support 4' is concreted and stored on the column head. As a result, an increase in the effective column head cross-section is achieved, solely by increasing the shear resistance of the hazardous area without the ceiling thickness or the column cross-section superior components are required.

The EP 1 223 259 B1 The applicant discloses the star or radial arrangement of perforated shear reinforcement sheets. A star-shaped arrangement of perforated sheets for shear reinforcement can also the WO 01/5323 A2 be removed.

• Eine Anordnung von Doppelkopfankern an radial angeordneten Dübelschienen zur Durchstanzbewehrung kann der DE 197 56 358 A1 entnommen werden. Zur Anpassung an die Beanspruchung nimmt die Stärke der Anker mit radialem Abstand von der Stütze ab. Die horizontal liegenden Dübelschienen sind an den oberen Kopfenden der Doppelkopfanker angeordnet und dort mit diesen verschweißt.
• Die DE 199 24 418 A1 beschreibt bügelförmige Ankerelemente im Zusammenhang mit einer Durchstanzbewehrung. Die Ankerelemente können in eine Biegebewehrung eingehängt oder durch stabförmige oder flach liegende Distanzleisten miteinander verbunden werden.
• Aus der DE 10 2004 006 618 A1 sind Filigran- oder Grossflächenelementplatten für Betondecken bekannt. Im Auflagebereich einer Stütze sind mehrere Doppelkopfanker durch eine horizontal liegende Schiene klebetechnisch an einer Kopf-Außenfläche miteinander verbunden. Die Schiene weist Löcher auf und dient der vorzugsweise regelmäßigen, Anordnung der Anker in einer unteren Grundbetonschicht nach Art einer Montagehilfe. Nachdem die Anker in der Grundbetonschicht der Filigranplatte im Bereich ihrer unteren Ankerköpfe, einbetoniert sind, ist die Schiene entbehrlich und sie wird deshalb entfernt, wodurch die oberen Ankerköpfe nicht länger miteinander verbunden sind. Auch diese Schiene hat also die Funktion einer hilfsweisen Befestigung der Anker untereinander. Die Schiene soll bewehrungstechnisch ohne Funktion sein.
• Die DE 34 11 591 C1 beschreibt stabförmige Schub- oder Zugbewehrungselemente für Stahlbetonkonstruktionen als Durchstanzbewehrung, die über orthogonal verlaufende, lang gestreckte und flexible Verbindungselemente miteinander verbunden sind, wodurch sie zum einfachen Transport zusammenrollbar und in beliebig geformter Anordnung einsetzbar sind. Hierzu kann auch ein flexibler Blechstreifen als Verbindungselement vorgesehen. Die Ankerelemente können dabei Köpfe oder Abbiegungen zur besseren Verankerung aufweisen.
• Die DE 27 27 159 C3 beschreibt eine Durchstanzbewehrung mittels senkrechter endverdickter Anker, bei der die Anker am Fußpunkt Ober ein horizontal liegendes Flacheisen, mit dem sie verschweißt sind, miteinander verbunden sind, so dass sie durch Festnageln auf der Schalung gegen Umfallen gesichert werden können. Die verdickten Ankerköpfe gestatten es, Kräfte aus den Bewehrungselementen ohne Schlupf auf den Beton abzugeben.

There are a number of punching movements in vertical anchor elements known, which are connected by an assembly aid at one end:

• An arrangement of double-headed anchors on radially arranged dowel rails for punching shear reinforcement can DE 197 56 358 A1 be removed. To adapt to the stress decreases the strength of the armature with a radial distance from the support. The horizontal dowel rails are arranged at the upper head ends of the double-headed anchor and welded there with these.
• The DE 199 24 418 A1 describes bow-shaped anchor elements in connection with a punching shear reinforcement. The anchor elements can be suspended in a bending reinforcement or connected to each other by rod-shaped or flat spacer strips.
• From the DE 10 2004 006 618 A1 Filigree or large surface element panels are known for concrete ceilings. In the support area of a support several double-headed anchors are adhesively connected to each other by a horizontal rail on a head-outer surface. The rail has holes and serves the preferably regular, arrangement of the anchor in a lower base concrete layer in the manner of an assembly aid. After the anchors in the base concrete layer of the filigree plate are concreted in the area of their lower anchor heads, the rail is dispensable and it is therefore removed, whereby the upper anchor heads are no longer connected to each other. So this rail also has the function of an auxiliary attachment of the anchor with each other. The rail should be without reinforcement technology.
• The DE 34 11 591 C1 describes rod-shaped shear or tensile reinforcement elements for reinforced concrete structures as a punching shear reinforcement, which are connected to each other via orthogonal, elongated and flexible connecting elements, whereby they can be rolled up for easy transport and used in any shaped arrangement. For this purpose, a flexible metal strip may be provided as a connecting element. The anchor elements can have heads or bends for better anchoring.
• The DE 27 27 159 C3 describes a punching shear reinforcement by means of vertical end-thickened anchors, in which the anchor at the bottom of a horizontally lying flat iron, with which they are welded, are connected to each other, so that they can be secured by nailing on the formwork against falling over. The thickened anchor heads make it possible to release forces from the reinforcing elements without slipping on the concrete.

This connecting element is in turn configured and arranged as an assembly aid.

PRESENTATION OF THE INVENTION

Based on this, the object of the invention is to propose a comparatively simple reinforcement arrangement and a corresponding punching reinforcement element. To solve this problem, a reinforcement arrangement with the features of claim 1 and a punching reinforcement element with the features of claim 14 is proposed.

Accordingly, the invention is based on the basic idea of aligning one or more oblong anchor elements, which are transverse or oblique to the ceiling surface, along at least one shear or tensile reinforcement element and thus relieve the endangered concrete cross section in the manner of a truss. This is at least one, in particular rigid, shear or tensile reinforcement element which is arranged inclined at least over a partial length to the direction of extension of the anchor elements at an angle, wherein the anchor elements are preferably designed in rod form. There is a special arrangement of the shear or tensile reinforcement elements made such that they extend in a central region between the ends of the anchor elements. The effect of this particular combination of shear and compression reinforcement elements will be further explained below. The anchor elements and the shear or tensile reinforcement elements, along which the anchor elements are aligned, can in principle be arranged unconnected to one another, since after setting of the concrete, this establishes an operative connection between the two. They may also be temporary, e.g. be secured by wire together. Preferably, however, they are firmly welded together. As a result, the highest reinforcement effects are achieved and processing is greatly facilitated.

The orientation of the one or more anchor elements along at least one shear or tensile reinforcement element relative to the support can be basically along a freely selectable lines, such as a single or multiple waveform or along a polygon. The anchor elements may vary in their lateral distance to the shear or tensile reinforcement elements. They are preferably applied to the push or tensile reinforcement element. They may be arranged on one or both sides of the shear or tensile reinforcement element or receive the shear or tensile reinforcement element in itself.

In particular, in ceilings having a surface inclined to the horizontal, the anchor elements may be arranged obliquely, d. H. At an angle to the vertical, this angle may be greater than about 1 °, preferably this angle to the vertical may be less than about 45 °. In a particularly preferred embodiment, the angle between the anchor elements and the vertical is about 20 °. Optionally, the anchor elements can also be arranged vertically in the inclined ceiling surface. It is also possible, the anchor elements obliquely, d. H. to arrange with a slope relative to the vertical in a horizontally oriented ceiling. This also applies to ceilings whose ceiling surfaces have no inclination relative to the horizontal.

In order to achieve the highest possible punching shear reinforcement, several shear or tensile reinforcement elements with the associated Druckbewehrungs- or anchor elements starry or radial with respect to the support, in the Nahzone they are to be arranged in the ceiling aligned.

It has been found that can be significantly increased by the invention, the shear or draw resistance in the vulnerable section. The compressive strength in the region of the near zone is also significantly improved by the invention. The inventive combination and mutual assignment of the push or pull and compression reinforcement elements leads to an unexpectedly high stiffening and reduction of punching risks in the support zone and beyond.

The arrangement of shear or tensile reinforcement elements according to the invention also also causes the eruption cone, which can be caused by the support, to be laterally needled, so that the statics of the punching reinforcement are improved.

In a preferred embodiment, shear or tensile reinforcement elements are used, which are arranged parallel to a reference plane spanned by the anchor elements. These shear or Zugbewehrungselemente may be at least partially oriented diagonally to the orientation of the anchor elements, the slope in the portion which is inclined to the anchor elements, between the shear or Zugbewehrungselement and the extension direction of the reinforcement assembly between 10% and 100% and especially may preferably be on the order of 45%. In particular, a shear or tensile reinforcement element formed as a strut element can also be provided. In order to increase the concrete bond in the region of the shear or tensile reinforcement elements, the surfaces of the shear or tensile reinforcement elements have a surface profile. It can be provided to further increase the bond with the concrete openings or openings in the shear or tensile reinforcement element.

As anchoring elements are preferred and as at least partially known per se double head anchor, bar anchors or high-strength composite anchor, in particular ring hoop anchor into consideration. Double-headed anchors consist of an anchor bolt and provided at the ends anchor heads, relatively larger cross-section. The ironing anchors also have an elongated shape, with bow-shaped connecting regions taking over the function of an anchor head between parallel, straight, stretched regions. High-strength composite anchors have known distributed over the rod length, distinctive profiles in different designs.

For a particularly advantageous clamping of the punching reinforcement element, in particular in the region of its support-side end, end anchoring means can be provided. This happens particularly advantageous in the form of the shear or Zugbewehrungselemente laterally projecting bolts, eg, pushed through and / or welded round bars in one or more height ranges, inter alia, as from EP 1 223 259 B1 known to the applicant. It is also possible to group together a plurality of punching shear reinforcement elements at the relevant end, ie, for example, to use connecting elements that connect several connecting elements or similar end anchorages.

Advantageously, the shear or tensile reinforcement elements can also be formed in several parts, wherein the parts of the push or tensile reinforcement element can be arranged either on one side of the anchor elements or on both sides. It may be expedient if the multi-part shear or tensile reinforcement elements are at least partially interconnected. In a particular embodiment, the shear or tensile reinforcement elements may also be formed bow-shaped. Optionally, the push or pull reinforcement element may be circular or substantially oval in shape, with the plane in which the shear or tensile reinforcement element is disposed being substantially parallel to the plane defined by the anchor elements.

The above-mentioned and the claimed components to be used according to the invention described in the exemplary embodiments are not subject to special conditions of size, shape, material selection and technical design, so that the selection criteria known in the field of application can be used without restriction.

Further details, features and advantages of the subject matter of the invention will become apparent from the subclaims, as well as from the following description of the accompanying drawings and table, in which - by way of example, - Embodiments of a reinforcement arrangement or of punching reinforcement elements are shown. Also, individual features of the claims or of the embodiments may be combined with other features of other claims and embodiments.

BRIEF DESCRIPTION OF THE FIGURES In the drawing show

Fig. 2A

a reinforcement arrangement for a resting on a pillar-like support 4 ceiling in plan view from above, wherein only the one half of the column is shown;

Fig. 2B

from an arrangement according to Fig. 2A a vertical sectional view through the support center;

Figs. 3A-3E

five embodiments of punching reinforcement elements with at least partially inclined strut elements as shear or tensile reinforcement elements;

Fig. 4A, 4B

two further embodiments of punching reinforcement elements in the installed state in vertical section;

Fig. 5A, 5B

Further embodiments of punching reinforcement elements with end anchoring means for improving the clamping, wherein a view from above in relation to a columnar support 4 is shown, and wherein the end anchoring means are attached either individually to the punching reinforcement elements ( Fig. 5A ) or a plurality of punching reinforcement elements are connected by a final anchoring means to a group ( Fig. 5B ); such as

Fig. 6A-C

Further embodiments of punching shear elements with differently designed shear or tensile reinforcement elements 12th

DETAILED DESCRIPTION OF EMBODIMENTS

How out FIG. 2A it can be seen, are from the outer periphery of a support 4 shown in half of star-shaped apart punching shear elements 10, each consisting of a straight shear or tensile reinforcement element 12 and along this aligned anchor elements 14 in the form of Doppelkopfankem, as in side view FIG. 2B can be seen. All punching shear reinforcement elements are as in FIG. 2B illustrated, poured into a concrete pavement 3, wherein the parallel planes spanned by the anchor elements 14 on the one hand and by the shear or tensile reinforcement elements 12 on the other hand extend approximately at right angles to the surface normal of the concrete pavement 3. In the exemplary embodiment, ten anchor elements 14 are provided for each punching reinforcement element 10. This number can be bigger and smaller. The length of the punching reinforcement elements 10 in the direction of the longitudinal extension of the shear or tensile reinforcement elements 12 will vary depending on the application and requirement.

In the embodiments of the FIGS. 3A to 3E the shear or tensile reinforcement elements 12 are formed like a strut. Fig. 3A shows an embodiment with two struts 12A, 12B, which are arranged crossed one another. According to Fig. 3E the anchor elements 14 are formed from a bracket with two upright parallel struts 14A and have at the upper and lower ends of connecting U-shaped bracket 14B. The push or tensile reinforcement element 12 is fastened with respect to one of the struts 14A in the inside of the temple. A strut element, which runs partially horizontally, the Fig. 3B be removed. A portion (or a partial length) 13 of the strut element is inclined relative to the horizontal or relative to the orientation of the concrete surface 3 by an angle, whereby the course of the strut element in the section 13 has a slope. Fig. 3C shows a similar embodiment as Fig. 3B with the lower difference, the shear or tensile reinforcement element 12 and the strut have a shorter portion 13, which is inclined relative to only one anchor element 14. The slope of section 13 is larger here than in the example according to Fig. 3B , Of the Fig. 3D is another Schub- or Zugbewehrungselement 12 'can be seen, which is shown in dots, and in which the inclined portion 13' is laterally offset relative to that of the first shear or Zugbewehrungselementes 12, so that not a middle but a marginal anchor element is crossed , With respect to this offset, there is no limitation, so that it may be larger and smaller, for example, and alternatively may be arranged in the opposite direction. A corresponding offset can be provided if not only one strut element is provided per punching reinforcement element. Preferably, the offset corresponds to the distance between adjacent anchor elements 14. Alternatively, it can also be provided to arrange two or more strut elements with different degrees inclined portion 13.

According to the embodiment Fig. 4A are shear or tensile reinforcement elements 12 formed in several parts. According to Fig. 4B can multipart shear or tensile reinforcement elements 12 also be connected to each other. The shear or tensile reinforcement elements 12 can according to Fig. 4B be arranged on both sides of the anchor elements 14 or alternatively on only one of the sides (not shown in the FIGS. 4A and 4B ). The shear or tensile reinforcement elements 12 according to the FIGS. 4A and 4B have no horizontally oriented portion, whereby the portion 13, which is arranged at an angle to the anchor elements 14, extends over the entire length of the push or tensile reinforcement element 12. According to the FIGS. 4A and 4B , as well as according to the FIGS. 6A to 6C , The anchor elements 14 may be arranged on the head side in the region of a grid reinforcement 17 or a per se known head strut.

The embodiment of the Figs. 5A and 5B shows Schub- or Zugbewehrungselemente 12 with Endverankerungsmitteln 18. These are executed in the illustrated Ausführurtgsbeispiel as round rod sections, the same preferably inserted at different heights of the push or Zugbewehrungselementes 12 through holes therethrough and welded thereto or welded butt-end. From the Figs. 5A and 5B it can be seen that the end anchoring means 18 eg on both sides of the push or tensile reinforcement element 12 can protrude ( Fig. 5A ). But you can also summarize several punching reinforcement elements 10 as a group. FIG. 5B shows in this respect two combined punching reinforcement elements 10, which are connected by a rod-shaped end anchoring means 18 with each other. This arrangement is particularly easy to handle even when installed in the ceiling reinforcement.

Further advantageous embodiments of the shear or tensile reinforcement elements of the arrangement according to the invention or the punching shear reinforcement elements according to the invention can be FIGS. 6A to 6C be removed. According to Fig. 6A the shear or tensile reinforcement elements 12 are formed bow-shaped. Optionally, the shear or tensile reinforcement elements 12 may also be formed substantially annular or oval. According to Fig. 6B the shear or tensile reinforcement elements 12 on a concrete profile increasing surface profile or a surface profiling on. In this case, in addition to the improvement of the composite in the shear or tensile reinforcement elements 12 also ends arranged heads 15 may be provided with preferably flat end faces. According to Fig. 6C For example, these heads 15 may be inclined relative to the orientation of the push or pull reinforcement elements 12. Again Fig. 6C it can be seen, the inclination of the heads 15 of the shear or tensile reinforcement elements 12 may be selected so that the flat end face of the heads 15 is aligned substantially parallel to the end face of the anchor heads 14D, 14E.

LIST OF REFERENCE NUMBERS STATE OF THE ART

1'

frame

2 '

cross

3 '

concrete ceiling

4 '

support

INVENTION

3

concrete ceiling

4

support

10

Studrails element

12.12 '

Push or tensile reinforcement element

12A / B

Push or tensile reinforcement element

13.13 '

inclined section or part length

14

anchor member

14A

drag stay

14B

anchor bracket

14C

anchor bolts

14D

anchor head

14E

anchor head

15

end-face head

16

perforations

17

grid reinforcement

18

Endverankerungsmittel

Claims (15)

Arrangement for reinforcing a concrete structure against punching in the region of the support of a ceiling element on a support, comprising a plurality of anchor elements (14) in at least one row with lateral spacing to each other in in the near zone laterally of the support ceiling areas in the ceiling (3 ) and are oriented perpendicular or obliquely inclined to the ceiling surface, in which at least one elongated shear or tensile reinforcement element (12) aligned along the row and at least one of the anchor elements (14) is fixedly assigned, wherein the push or Zugbewehrungselement (12) at least on a part length (13), is arranged inclined to the direction of extension of the associated anchor elements (14) at an angle. Arrangement according to claim 1, characterized in that the anchor elements (14) and the push or Zugbewehrungselemente (12) span planes which are arranged parallel to each other. Arrangement according to claim 1 or 2, characterized in that the alignment of the shear or Zugbewehrungselemente (12) along a straight plane is provided. Arrangement according to one of claims 1 to 3, characterized in that the shear or Zugbewehrungselemente (12) are arranged in a star shape with respect to the support (4). Arrangement according to one of claims 1 to 4, characterized in that the shear or Zugbewehrungselemente (12) are designed as strut elements. Arrangement according to one of claims 1 to 5, characterized in that the shear or Zugbewehrungselemente (12) have a concrete composite increasing surface profile. Arrangement according to one of claims 1 to 6, characterized in that the shear or Zugbewehrungselemente (12) have at least one means (18) for the final anchoring. Arrangement according to one of claims 1 to 7, characterized in that the shear or Zugbewehrungselemente (12) at at least one of its ends a head (15). Arrangement according to one of claims 1 to 8, characterized in that the anchor elements (14) are connected to the push or Zugbewehrungselementen (12). Arrangement according to one of claims 1 to 9, characterized in that the anchor elements (14) are designed as double-headed anchors. Arrangement according to one of claims 1 to 10, characterized in that the anchor elements (14) are designed in bow shape. Arrangement according to one of claims 1 to 11, characterized in that the push or Zugbewehrungselemente (12) are multi-part, wherein the push or Zugbewehrungselemente (12) are preferably at least partially interconnected. Arrangement according to one of claims 1 to 12, characterized in that the shear or Zugbewehrungselemente (12) are formed bow-shaped. Punching stock reinforcing element for reinforcing a concrete structure against punching in the region of the support of a ceiling element on a support (4), with a plurality of anchor elements (14) which in at least one row with a lateral distance to each other in in a near zone laterally of the support ceiling areas in the Ceiling (3) embedded in concrete and oriented perpendicular or obliquely inclined to the ceiling surface, characterized in that at least one elongated shear or tensile reinforcement element (12) aligned along the row and at least one of the anchor elements (14) is fixedly assigned, and that the thrust or tensile reinforcement element (12) at least on a partial length (13), is arranged inclined to the direction of extension of the associated anchor elements (14) at an angle. Punching shear reinforcement element according to claim 14, characterized by at least one of the characterizing features of claims 5 to 13.

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