EP4112833A1 - Agencement de renfort permettant d'augmenter la résistance au poinçonnage, ainsi que procédé associé - Google Patents

Agencement de renfort permettant d'augmenter la résistance au poinçonnage, ainsi que procédé associé Download PDF

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Publication number
EP4112833A1
EP4112833A1 EP21182115.2A EP21182115A EP4112833A1 EP 4112833 A1 EP4112833 A1 EP 4112833A1 EP 21182115 A EP21182115 A EP 21182115A EP 4112833 A1 EP4112833 A1 EP 4112833A1
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EP
European Patent Office
Prior art keywords
double
reinforcement
chords
headed
chord
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EP21182115.2A
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German (de)
English (en)
Inventor
Martin Ritter
Thomas Anhell
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AVI Alpenlaendische Veredelungs Industrie GmbH
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AVI Alpenlaendische Veredelungs Industrie GmbH
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Priority to EP21182115.2A priority Critical patent/EP4112833A1/fr
Publication of EP4112833A1 publication Critical patent/EP4112833A1/fr
Withdrawn legal-status Critical Current

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    • 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 [3D] extent, e.g. lattice girders
    • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors

Definitions

  • the invention relates to a reinforcement arrangement for increasing the punching shear resistance of a planar structure resting on a support, in particular a punctiform support, such as a reinforced concrete slab.
  • the invention also relates to a set for erecting a reinforcement arrangement.
  • the invention relates to a method for erecting a reinforcement arrangement in order to increase the punching shear resistance of a planar structure resting on a support, in particular a punctiform support, such as a reinforced concrete slab.
  • the invention relates to the use of such a reinforcement arrangement or such a set.
  • reinforcement stirrups are often used for this purpose. As a rule, however, these require a great deal of laying effort and typically only allow a limited increase in punching shear resistance. It is also known to use arrangements of vertically aligned double-headed dowels, with a large number of double-headed dowels connected by a connecting strip usually being designed as a double-headed dowel strip for practical positioning, as shown, for example, in the documents DE 41 29 903 A1 and DE 100 01 595 A1 .
  • Such double-headed dowel strips generally require a relatively large and bulky form of heads and these connecting dowel rods of the double-headed dowels, often with a large number of double-headed dowels, it usually being necessary to use a respective size of the heads and dowel rods connecting them.
  • the object of the invention is to specify a reinforcement arrangement of the type mentioned at the beginning, with which an increase in the load-bearing capacity or the punching shear resistance of a surface supporting structure can be achieved, in particular with reduced work effort or laying effort.
  • Another goal is to specify a set of the type mentioned at the outset for erecting such a reinforcement arrangement.
  • Another goal is to specify the use of a reinforcement arrangement or set of the type mentioned at the outset.
  • the reinforcement arrangement is formed with a combination of several punching shear reinforcement elements and several double-headed dowels, which are arranged in a reference surface defining the surface structure, the punching shear reinforcement elements each having a upper chord, a lower chord and at least one transverse element, which transverse element connects the chords at a distance from one another in a direction transverse to the reference surface along its longitudinal extent at a number of connection points, with the punching shear reinforcement elements being laid in such a way that longitudinal axes of upper chords and lower chords in Are aligned essentially in the direction of a support axis or a support edge of the support, wherein at least one double-headed dowel aligned transversely to the reference surface is arranged between the longitudinal axes of the chords.
  • At least one or more double-headed dowels are arranged at least between two of the longitudinal axes, in particular immediately adjacent longitudinal axes, of upper chords or lower chords. At least one or more double-headed dowels are preferably arranged between several, in particular a majority or a large part, particularly preferably essentially all, of two of the, in particular directly adjacent, longitudinal axes of the upper chords or lower chords. Two such directly adjacent longitudinal axes are also referred to as a pair of longitudinal axes.
  • the arrangement is usually viewed from above or from the support axis of the reinforcement arrangement, ie in a view along the support axis or at an angle, in particular orthogonally, to the reference plane.
  • the two directly adjacent longitudinal axes can be formed by the upper chord or lower chord of two directly adjacent punching shear reinforcement elements, one of the chords of the respective punching shear reinforcement element forming one of the longitudinal axes.
  • the at least one, in particular several, double-headed dowels can then be arranged between these longitudinal axes.
  • the two immediately adjacent longitudinal axes can be formed by the upper chord or lower chord of one of the punching shear reinforcement elements if the upper chord or lower chord is designed with two chord legs, which are aligned in particular in a U-shape or preferably in a V-shape, with each a belt leg forms one of the longitudinal axes.
  • the at least one, in particular several, double-headed dowels can then be arranged between these longitudinal axes.
  • the above preferably applies to both the upper and lower straps.
  • the basis of the invention is the finding that a combination of punching shear reinforcement elements and double-headed dowels can advantageously increase a load-bearing capacity or punching shear resistance by optimizing the introduction of force into the support.
  • the longitudinal axes of the upper and lower chords are essentially aligned in the direction of the support axis or the support edge of the support, a force distribution directed towards the support axis can be implemented. In this way, an advantageous widening of a potential punching shear area can be achieved.
  • the longitudinal axes of the upper and lower chords form angle legs which converge towards the support axis or the support edge of the support. Facing the support axis means in this sense that convergent ends are arranged closer to the support axis or the support edge than divergent ends.
  • Punching shear forces can be both via the at least one or preferably more transverse elements with which the upper and lower straps are each connected, as well as over the double-headed dowels, which are arranged between the preferably angled longitudinal axes of the chords, are derived. It is advantageous if at least one double-headed dowel aligned transversely to the reference plane is arranged between several, in particular all, of the longitudinal axes of the upper and lower chords.
  • the respective punching shear reinforcement element preferably has a plurality of transverse elements spaced apart from one another along the longitudinal extension of the upper and lower chord, usually in the form of transverse rods, which each connect the upper chord and lower chord.
  • the transverse elements or transverse rods needle or stabilize areas of the surface structure or the reinforced concrete slab in which cracking could occur or is occurring, under tensile loading of the transverse elements or transverse rods.
  • the transverse elements are anchored in the tensile structure or in the reinforced concrete slab via the chords.
  • the at least one or the double-headed dowels are usually arranged between the upper and lower chords forming the respective longitudinal axes.
  • double-headed dowels in particular, which are arranged in greater proximity to the support axis or the support edge or are located in an end region of the chords between the chords facing the support axis, are of particular importance for a shear force dissipation or an increase in the load-bearing capacity due.
  • Double-headed dowels are usually particularly relevant for efficient force dissipation, which are arranged in close proximity to the support axis or the support edge or are located in an end region of the chords facing the support axis between the respective chords or angle legs. So it may already be sufficient, merely one Double-headed dowels should be arranged between the angle legs, preferably in the end area of the chords, in order to achieve a pronounced increase in the punching shear resistance.
  • the above applies in particular to the reinforcement arrangement from a support axis view, i.e. in a view along the support axis.
  • Longitudinal axes of the straps, which form the angle legs, define in this context, in particular, an orientation of the straps or strap sections relative to one another, which are aligned essentially convergently towards one another. It is not necessary for the upper or lower straps or their strap sections to extend, in particular completely, in a straight line, although this is usually preferred.
  • belts or belt sections can be straight or have one or more curvatures or be curved, for example curved like a parabola.
  • the upper or lower chord of the punching shear reinforcement element is formed with chord legs aligned convergently with one another, for example with a v-shaped upper chord or v-shaped lower chord, the chord legs are preferably convergent to the support axis or oriented towards the bearing edge of the bearing.
  • At least one double-headed dowel can then advantageously be arranged between the belt legs, in particular between at least one or more belt leg pairs formed with immediately adjacent belt legs. This applies correspondingly to several, in particular a majority, preferably all, of the punching shear reinforcement elements or chord leg pairs.
  • punching shear reinforcement elements are arranged next to one another, so that directly adjacent chord legs, in particular of immediately adjacent punching shear reinforcement elements, converge towards one another and face the support axis or the support edge. It is advantageous if at least one double-headed dowel is arranged at least between the chord legs of at least one, preferably several, of the punching shear reinforcement elements and/or at least one double-headed dowel is arranged between at least one, preferably several, of immediately adjacent chord legs of directly adjacent punching shear reinforcement elements.
  • Double-headed dowels are arranged, preferably have several of the immediately adjacent belt legs or several such pairs of belt legs, particularly preferably a majority or all of these, each having at least one or more double-headed dowels.
  • directly adjacent longitudinal axes or chord shanks of one or more upper chords or, in particular directly adjacent, longitudinal axes or chord shanks of one or more lower chords can be configured in this way, but preferably both, in particular immediately adjacent ones , Longitudinal axes of upper chords and lower chords are formed one below the other in such a way.
  • Double-headed dowels are usually formed with a dowel rod at the ends of which a widened head is arranged, often upset. It is favorable if the head has a diameter which is at least twice, preferably at least three times, the diameter of the dowel rod. It is advantageous if the head has a flat head surface at its end. As a result, forces can be efficiently absorbed or released via the head surface.
  • the top surface is usually aligned orthogonally to the longitudinal axis of the dowel rod.
  • An upper head and a lower head of the double-headed dowel are generally of essentially the same size, preferably with an identical shape. However, it can also be advantageous if the upper and lower heads are of different sizes and/or shapes.
  • the head has a diameter between 25 mm and 50 mm, in particular less than 40 mm, preferably about 30 mm. It is advantageous if the dowel rod has a diameter of between 5 mm and 20 mm, in particular less than 15 mm, preferably around 10 mm.
  • Commonly known double-headed dowels, in particular double-headed dowel strips generally have significantly larger head diameters and dowel rod diameters, making them difficult to install.
  • the at least one double-headed dowel can be designed with a smaller head diameter and/or dowel rod diameter due to the intended structure of the reinforcement arrangement.
  • the intended described combination of punching shear reinforcement elements and double-headed dowels means that a use-dependent adjustment of the size of heads and dowel rods is generally no longer necessary, so that an optimized organizational and/or production effort can advantageously be achieved.
  • An arrangement of the at least one double-headed dowel transversely to the reference surface designates an angular, in particular orthogonal, orientation of the longitudinal axis of the double-headed dowel to the reference surface.
  • the reference surface is usually designed as a reference plane.
  • a spacing of the upper chord from the lower chord with the transverse element transversely to the reference surface designates an angular, in particular orthogonal, orientation of the spacing or a direction of spacing relative to the reference surface.
  • the support axis is generally oriented at an angle, mostly orthogonally, to the reference surface.
  • the support axis usually represents an axis of the support that supports the surface structure, for example a longitudinal axis of a support that supports the surface structure.
  • the surface structure is usually designed as a reinforced concrete surface element, in particular a reinforced concrete slab.
  • the support axis is formed by a central plane of the wall section that defines the wall section or its alignment, or the central plane can be viewed as a multiplicity of support axes arranged next to one another.
  • the center plane is usually aligned essentially at an angle, in particular orthogonally, to the reference surface or runs parallel to the support axes.
  • the wall section can be a wall end, ie an end piece of a wall.
  • Such a wall end often also has punching shear properties, which can advantageously be taken into account by means of the punching shear reinforcement arrangement.
  • the respective punching shear reinforcement element has several transverse elements spaced apart from one another along the longitudinal extent of the upper and lower chord, usually in the form of transverse bars, usually shaped in a straight line, which connect the upper chord and lower chord with each other associate.
  • the transverse rods also referred to as rungs, are generally oriented at an angle, in particular essentially orthogonally, to the longitudinal extension of the belts or to the reference surface. It has proven useful if the upper chord is arranged on one of the ends of the respective crossbar and the lower chord is arranged or connected to the crossbars at the other end of the respective crossbar.
  • a length of the crossbar end is preferably less than 25%, in particular less than 15%, of the length of the crossbar. It can be expedient if the transverse bars protrude beyond the upper and/or lower chord in the direction of a longitudinal extension of the transverse bars. Typically, the transverse members are spaced at regular intervals along the length of the straps. For a high punching shear resistance, it can be advantageous if, along the longitudinal extension of the chords, directly adjacent transverse elements of the punching shear reinforcement element arranged closer to the support axis or the support edge are at a smaller distance from one another than immediately adjacent transverse elements of the punching shear reinforcement element, which are further away from the support axis or the support edge are arranged.
  • the upper or lower chord is usually formed with a longitudinal bar. For high anchoring of the transverse elements, it is favorable if the upper and/or lower chord is formed with a plurality of longitudinal rods, usually two, preferably spaced apart from one another.
  • the acute angle formed by the longitudinal axes of the straps generally has an angular width of between 10° and 80°, in particular between 15° and 60°, preferably of a maximum of 54°, particularly preferably of a maximum of 45°, particularly preferably of a maximum of 30°. on. This enables a high increase in the load-bearing capacity of the surface structure in the support area. A particularly large increase in load-bearing capacity and punching shear resistance was achieved in the range between 15° and 27°.
  • the at least one double-headed dowel between belt sections of the belt or belts which Belt sections which form the respective longitudinal axes or the angle leg, is arranged in an end region which is delimited or defined by the bearing axis or the bearing edge facing the end pieces of the belt sections.
  • belt sections can be formed by belt legs of an upper or lower belt, particularly aligned in a V-shape to one another, as explained below, with the at least one double-headed dowel being arranged between the end pieces of the belt legs.
  • such belt legs can be formed by belt legs of directly adjacent belt legs of different upper or lower belts, which are aligned in a V-shape with respect to one another.
  • double-headed dowels arranged in the area of the convergent ends of the chord sections usually contribute particularly to an increase in the punching shear resistance.
  • the end pieces facing the support axis or the support edge generally represent the convergent end pieces or ends of the chord sections, which are therefore aligned convergently to one another or face a vertex of the respective angle.
  • the end pieces of the respective belt sections or the respective end piece of the respective belt section can have a longitudinal extent of up to 100%, in particular between 4% and 95%, of the longitudinal extent of the respective belt sections or the respective belt section.
  • the end pieces of the respective belt sections or the respective end piece of the respective belt section have a longitudinal extent of between 5% and 80%, in particular between 10% and 75%, preferably between 15% and 50%, particularly preferably have between 15% and 40% of the longitudinal extent of the respective belt sections or of the respective belt section. It is particularly expedient if the longitudinal extent of the end pieces or of the end piece is less than 30%, in particular less than 20%, preferably less than 15%, particularly preferably less than 10%, of the longitudinal extent of the respective strap sections or the respective strap section.
  • a respective end region located between the end pieces can thus advantageously be fixed for arranging the at least one double-headed dowel.
  • the double-headed dowels of the reinforcement arrangement are arranged in one or more of the end regions.
  • the positioning of the double-headed dowels in the end areas can ensure that a high punching shear resistance can be achieved and, on the other hand, the amount of work and often the use of materials can be particularly reduced, especially since double-headed dowels that are not arranged in the end area, as explained above, contribute to a lesser extent to the punching shear resistance . In this way, the work effort or laying effort, which is already reduced by the reinforcement arrangement, can advantageously be further reduced or minimized.
  • the aforementioned longitudinal extent of the end pieces is less than 20% of the longitudinal extent of the respective belt section and at least 75%, at least 80% or at least 90% of the double-headed dowels are arranged in the end area, as described above. It is particularly favorable for a high load-bearing capacity and reduced laying effort as well as frequently also the use of materials if the aforementioned longitudinal extent of the end pieces is less than 15% of the longitudinal extent of the respective belt section and at least 75%, at least 80% or at least 90% of the double-headed dowels as described above in the end area are arranged.
  • the aforementioned longitudinal extent of the end pieces is less than 10% of the longitudinal extent of the respective belt section and at least 75%, at least 80% or at least 90% of the double-headed dowels are arranged in the end area as described above.
  • a particularly efficient shear force dissipation can be realized via the combination of transverse elements and double-headed dowels as mentioned above, with the belts simultaneously ensuring a pronounced robustness of the anchoring in the surface structure or the reinforced concrete slab.
  • the minimum distance is 2 cm, preferably 4 cm. Accordingly, it is expedient if all of the double-headed dowels arranged between two immediately adjacent longitudinal axes or chord sections are arranged at such a distance.
  • At least 75%, in particular at least 80%, preferably at least 90%, particularly preferably 95%, of the respective double-headed dowels are arranged between two directly adjacent longitudinal axes or belt sections according to such a distance range. This applies preferably with regard to all double-headed dowels of the reinforcement arrangement.
  • a particularly advantageous removal of the at least one or the double-headed dowel can depend, among other things, on the thickness of the surface structure. With a thickness of the surface structure of 15 cm to 100 cm, in particular 20 cm to 80 cm, the distance from the support edge or the support edge of the support is 4 cm to 150 cm, in particular 5 cm to 120 cm, preferably 10 cm to 111 cm, proved to be favorable.
  • the belt section for example if it is designed as a belt leg, has a longitudinal extent of 50 cm to 120 cm, in particular 60 cm to 100 cm.
  • the end piece of the respective belt section - in particular in accordance with the above statements - have a longitudinal extent of 8% to 40% of the longitudinal extent of the belt section.
  • the length of the belt section can be 60 cm, for example.
  • the end piece of the respective belt section in particular in accordance with the above statements—can have a longitudinal extent of 13% to 60% of the longitudinal extent of the belt section.
  • the length of the belt section can be 70 cm, for example.
  • the distance from the support edge or the support edge of the support is 4 cm to 150 cm, in particular 10 cm to 120 cm , particularly preferably 23 cm to 111 cm, shown to be particularly favorable.
  • the end piece of the respective belt section in particular in accordance with the above statements—can have a longitudinal extent of 23% to 100% of the longitudinal extent of the belt section.
  • the length of the belt section can be 100 cm, for example.
  • the upper chords and/or lower chords are each formed with two chord legs, with the longitudinal axes or longitudinal extensions of the chord legs essentially forming an angle, in particular an acute angle, or parallel to one another are aligned.
  • Punching shear reinforcement elements designed in this way enable a practicable and time-efficient construction of the reinforcement arrangement, since the punching shear reinforcement elements can be arranged independently. It is particularly advantageous if the longitudinal axes or longitudinal extensions of the belt legs form an angle. In this way, the punching shear reinforcement element itself already forms a shape that is advantageous for force distribution, with longitudinal axes of chords that form an angle, in particular an acute angle.
  • the belt legs form the aforementioned angle-forming belt sections.
  • an angular width between the belt legs can advantageously be configured in accordance with the aforementioned specified angular widths between the longitudinal axes of the belts be. Since such punching shear reinforcement elements have their convergent upper and lower ends of the chord limbs facing the support axis or the support edge of the support - i.e. the convergent ends are closer to the support axis or the support edge than the divergent ends - the combination is implemented as mentioned above of transverse elements and double-headed dowels as well as anchoring of the transverse elements via the chords enables efficient force dissipation in the direction of the support axis or the support edge.
  • At least one double-headed dowel is arranged between the chords or their longitudinal axis, in particular in the manner described above, shear forces can be efficiently dissipated and a high punching shear resistance can be synergistically implemented with a simultaneously small number and/or cross-sectional area of double-headed dowels or low laying costs.
  • a particularly high punching shear resistance can be achieved if the belt legs are connected to one another at their convergent ends, with the upper and lower belts preferably being of essentially V-shaped or U-shaped design.
  • the at least one double-headed dowel which is preferably arranged in the aforementioned manner in the vicinity of the connected ends, shear forces can be effectively dissipated. This is especially true when the top and bottom straps are V-shaped.
  • Convergent ends refer to those ends of the chords or chord legs which are aligned convergently with respect to one another or which face an apex of the respective angle, ie in particular the support axis or the support edge.
  • the punching shear reinforcement elements and the at least one double-headed dowel are generally arranged in such a way that the upper and/or lower head of the double-headed dowel protrudes beyond the punching shear reinforcement element.
  • the at least one double-headed dowel is designed as a pair of double-headed dowels.
  • the pair of double-headed dowels is generally formed with exactly two double-headed dowels spaced apart from one another, which are preferably connected to one another at a distance from one another by a spacer element. It has been shown that a pair of double-headed dowels, in particular a combination of two spaced-apart double-headed dowels, which is arranged in the aforementioned manner between the angle limbs or chord limbs, enables shear forces to be effectively dissipated or the punching shear resistance to be increased massively. This applies in particular to the advantageous positioning of the pair of double-headed dowels or their double-headed dowels, as stated above.
  • Additional double-headed dowels between two chords or chord shanks are usually not required or should be regarded as disadvantageous, especially since these primarily only increase the laying effort and often also bring in material and usually only bring minor advantages in terms of a further increase in load-bearing capacity cause.
  • a ratio of an increase in load-bearing capacity to the amount of work used, and often also the amount of material can be further optimized. If the double-headed dowels of the double-headed dowel pair are connected to one another at a distance from one another with the spacer element, a double-headed dowel pair is formed which is easy to handle.
  • the double-headed dowels are preferably rigidly connected to one another with the spacer element, as a result of which a practicable positioning of the double-headed dowels is made possible.
  • different pairs of double-headed dowels have a matching spacing between their double-headed dowels or correspondingly designed spacing elements. This advantageously makes it possible to implement a uniform spacing of the double-headed dowels between the different chords or chord legs, so that a homogeneous structure with matching force dissipation can be implemented.
  • the spacer element can be formed with sheet metal, for example with a sheet metal strip.
  • the double-headed dowels in particular the double-headed dowels of the double-headed dowel pair, are arranged between the chord legs in such a way that a connecting line between the double-headed dowels runs essentially in the direction of the support axis or, in particular, essentially orthogonally to the support edge, for example at rotationally symmetrical, approximately circular bearing, is aligned.
  • this can be for a Part, usually in the case of a rectangular or square support, or all pairs of double-headed dowels arranged between different belt legs, usually in the case of a rotationally symmetrical support.
  • exactly two double-headed dowels or a pair of double-headed dowels are arranged in the aforementioned manner between different pairs of chords or pairs of chord legs of upper or lower chords, which form different of the angle legs, in particular a majority, preferably all of these.
  • At least one reinforcement layer or reinforcement grid are arranged parallel to the reference surface, usually essentially above and/or below the punching shear reinforcement elements or double-headed dowels.
  • sections of the punching shear reinforcement elements or double-headed dowels can protrude between the reinforcement layer, mostly in order to support and/or stably arrange punching shear reinforcement elements or double-headed dowels.
  • the reinforcement layer is generally in the form of a reinforcement grid, usually formed with metal rods or reinforcement rods that are connected to one another, in particular welded, and usually crossing one another, in particular orthogonally.
  • metal rods or reinforcing bars are not rigidly connected to one another, but are placed one on top of the other.
  • the reinforcement arrangement has a lower reinforcement layer which is laid essentially parallel to the reference surface and is arranged essentially under the punching shear reinforcement elements, with the double-headed dowel, in particular its lower head, protruding through the lower reinforcement layer. It is advantageous if a lower edge of the lower reinforcement layer is aligned essentially flush with a lower edge of the lower head of the double-headed dowel.
  • the reinforcement arrangement has an upper reinforcement layer that is laid essentially parallel to the reference surface and is arranged essentially above the punching shear reinforcement elements, with the double-headed dowel, in particular its upper head, protruding through the upper reinforcement layer. It is advantageous if an upper edge of the upper reinforcement layer is aligned essentially flush with an upper edge of the upper head of the double-headed dowel. As a result, an advantageous interaction between the double-headed dowel and the upper reinforcement layer can be implemented with regard to the introduction of force into a hardening material that is usually added later, such as concrete. As a rule, such an alignment between double-headed dowel and reinforcement layers is more efficient with a lower head of the double-headed dowel and a lower reinforcement layer.
  • both the upper head and the lower head of the at least one double-headed dowel protrude through the upper and lower reinforcement layers or are aligned essentially flush with them. It goes without saying that it is favorable if several double-headed dowels, in particular all double-headed dowels, are aligned between two chords or chord legs or chord sections in one of the aforementioned ways. This is correspondingly advantageous for all double-headed dowels of the reinforcement arrangement.
  • the deviation from an exactly flush, aforementioned alignment between the respective head of the double-headed dowel and the respective reinforcement layer is less than 10%, in particular less than 5%, preferably less than 2%, of an average thickness of the respective, in particular upper or lower , Reinforcement layer, preferably an average thickness of the respective reinforcement layer forming transverse struts.
  • the reinforcement arrangement has proven particularly useful when the support is a column and the punching shear reinforcement elements are generally spaced apart from one another, preferably symmetrically, along a circumference around the support axis or the support edge of the column.
  • a high punching shear resistance of the surface structure is particularly relevant. Efficient force dissipation in the direction of the support or support axis and, in particular, distribution is advantageous in this way a shearing stress, so that a high punching shear resistance of the surface structure in relation to the support, in particular with a simultaneously small number and/or cross-sectional area of double-headed dowels or little laying effort, can be achieved.
  • a stress distribution with reduced stress peaks can be formed.
  • the punching shear reinforcement elements are arranged at a distance from one another, preferably at regular intervals. This means that a regular structure with homogeneous force dissipation can be implemented.
  • the punching shear reinforcement elements are arranged concentrically along the circumference around the support axis or the support edge.
  • the support is a wall section, in particular a wall end, of a wall and the support axis is formed by a central plane of the wall section, with the punching shear reinforcement elements being arranged in the support axis view, in particular spaced apart from one another, along the central plane, preferably spaced apart from it.
  • an advantageous high punching resistance can be achieved, in particular with a small number of double-headed dowels and/or a small double-headed dowel cross section or low laying effort.
  • the punching shear reinforcement elements are usually arranged along a support edge formed with the wall, often adjoining it. The convergent ends of the chords or chord shanks are usually aligned to face the center plane.
  • punching shear reinforcement elements are aligned in a row next to one another along the central planes. In this way, a force dissipation is directed to the center plane and, as explained above, shear forces can be efficiently transferred into the wall or wall section, in particular with the transverse elements and double-headed dowels.
  • chords or chord limbs or angle limbs essentially point to the support axis or are aligned essentially orthogonally to the support edge or, if appropriate, to the central plane.
  • a set for erecting a reinforcement arrangement described in this document comprising at least one punching reinforcement element and at least one double-headed dowel, the punching reinforcement element having an upper chord, a lower chord and at least one transverse element, wherein the at least one transverse element connects the straps along their longitudinal extent at a plurality of connection points spaced apart from one another.
  • a high level of practicability can be achieved if the punching shear reinforcement element can be arranged independently on a reference surface, so that the upper chord and lower chord are spaced apart from one another in a direction transverse to the reference surface. This enables the punching shear reinforcement element to be positioned stably in order to implement an aforementioned reinforcement arrangement.
  • the upper strap and/or lower strap are each formed with two strap legs, the longitudinal axes of the strap legs forming an angle, in particular an acute angle, or being aligned parallel to one another.
  • This enables a reinforcement arrangement to be erected with a particularly high resistance to thirst, in particular with a reduced laying effort at the same time.
  • such a punching shear reinforcement element can be positioned in the aforementioned manner in a particularly time-efficient manner with ease of handling.
  • the set has at least one pair of double-headed dowels or the at least one double-headed dowel of the set is designed as such.
  • the pair of double-headed dowels is preferably formed with exactly two double-headed dowels, in that they are rigidly connected to one another at a distance from one another with a spacer element are connected.
  • double-headed dowels connected in pairs as a unit simple laying and, in particular, a homogeneous structure of the reinforcement arrangement can be advantageously implemented.
  • a method of the type mentioned at the outset is advantageously provided, with the reinforcement arrangement being formed with a combination of several punching shear reinforcement elements and several double-headed dowels, with the punching shear reinforcement elements each having an upper chord, a lower chord and at least one transverse element, wherein the at least one transverse element connects the chords along their longitudinal extent at a number of connection points at a distance from one another, the punching shear reinforcement elements being arranged in a reference surface that defines the surface structure, so that the upper chord and lower chord are spaced apart from one another in a direction transverse to the reference surface, the punching shear reinforcement elements be laid in such a way that, in particular in the view of the support axis, longitudinal axes of upper chords or lower chords essentially in the direction of a support axis or a support edge of the Bearings are aligned, with at least one transverse to the reference surface aligned double-headed dowel is arranged between the longitudinal axes of the
  • immediately adjacent upper or lower chords or their longitudinal axes designate two upper chords or lower chords arranged directly next to one another or two longitudinal axes of one or two upper chords or one or two lower chords arranged directly next to one another. This preferably applies both to the upper chords or to the longitudinal axes of these one below the other and to the lower chords or to the longitudinal axes of these to one another.
  • a lower reinforcement layer is arranged essentially below the punching shear reinforcement elements parallel to the reference surface, with the at least one double-headed dowel being arranged in such a way that it protrudes through the lower reinforcement layer, preferably in such a way that a lower edge of the lower reinforcement layer is essentially flush with a Lower edge of the lower head of the double-headed dowel is aligned.
  • This enables an advantageous introduction of force with reduced stress peaks into a hardening material, such as concrete, which is usually added later, to form the surface structure.
  • an upper reinforcement layer is provided in an essentially aligned manner with an upper head of the at least one double-headed dowel.
  • the reinforcement arrangement is introduced into a hardening material, such as concrete, in order to form the surface structure, in particular in the form of a reinforced concrete surface element, usually a reinforced concrete slab.
  • the reinforcement arrangement and/or the set can be used as punching shear reinforcement for a surface structure supported by a support, such as a column or a wall.
  • a support such as a column or a wall.
  • FIG. 1 shows a schematic representation of a reinforcement arrangement 1, which is formed with a combination of several punching reinforcement elements 2 and double-headed dowels 3 in order to form punching shear reinforcement of a surface structure resting on a support 7, which is usually designed as a reinforced concrete slab.
  • the support 7 is designed as a support or column, where 1 shows a view from above or a view in the direction of a bearing axis A of the bearing 7 .
  • a plurality of punching shear reinforcement elements 2 and between these pairs of double-headed dowels 3 are arranged along a circumference around the support axis A or around a support edge 8 of the support 7 in a reference surface defining the surface structure.
  • the punching shear reinforcement elements 2 each have a V-shaped upper chord 5 and a V-shaped lower chord 4, which are connected to transverse elements 6 spaced apart from one another along their longitudinal extent, shown by way of example in FIG 2 .
  • the upper chord 5 or lower chord 4 can expediently be formed with a longitudinal element, for example a longitudinal bar, which is bent in a V-shape. It is favorable if - as in 2 shown - the upper belt 5 and / or lower belt 4 is formed with several, usually two, preferably spaced apart, longitudinal elements. This increases power transmission over the longitudinal elements. It is particularly favorable if the Transverse elements 6 are designed as transverse, preferably orthogonal, to the chords 4, 5 aligned, transverse rods or rungs.
  • transverse rods are spaced apart from one another along a longitudinal extent of the belts 4 , 5 .
  • Such crossbars advantageously designed as rungs, are in 2 shown.
  • the upper belt 5 and lower belt 4 each have two belt legs 9 which form an acute angle ⁇ .
  • the punching shear reinforcement elements 2 are arranged in such a way that the chord legs 9 converge in the direction of the support axis A or face the support edge 8 .
  • immediately adjacent longitudinal axes L of upper chords 5 and lower chords 4 form angled legs of an acute angle ⁇ .
  • the punching shear reinforcement elements 2 or their chords 4, 5 are arranged rotationally symmetrically around the support axis A.
  • convergent ends of the belt legs 9 essentially directly adjoin the bearing edge 8 .
  • a pair, in particular exactly one pair, of double-headed dowels 3 is arranged between the belt legs 9 or longitudinal axes L of at least one, preferably several, of the belts.
  • At least one pair each, of double-headed dowels 3 can be present between chord shanks 9 of upper chords 5 or lower chords 4 of the same punching shear reinforcement element 2 and/or between directly adjacent chord shanks 9 of upper 5 or lower 4 chords of immediately adjacent punching shear reinforcement elements 9 be.
  • a plurality of punching shear reinforcement elements 2 or a plurality of immediately adjacent punching shear reinforcement elements 2 can expediently be designed in this way.
  • the double-headed dowels 3 are each arranged in an end region formed by the end pieces of the chord legs 9 facing the bearing axis A, with the end pieces of the respective chord legs 9 generally having a longitudinal extent of less than 30% of a longitudinal extent of the Belt leg 9 has.
  • the arrangement of double-headed dowels 3 in pairs in this end area further optimizes both a high punching shear resistance and low installation costs, as well as frequent use of materials. More double-headed dowels 3 are usually not required for a high punching shear resistance and generally prove to be disadvantageous with regard to efficient laying work.
  • the double-headed dowels 3 are arranged at a distance of between 4 cm and 24 cm from the support edge 8 .
  • This preferred positioning range of the double-headed dowels 3 is in 3 drawn in with dashed circles, with a dashed inner circle 10 indicating a minimum distance of 4 cm and a dashed outer circle 11 a maximum distance of 24 cm from the support edge 8 .
  • all of the double-headed dowels 3 are preferably arranged in such a way, ie positioned between the dashed inner circle 10 and the dashed outer circle 11, in order to implement a particularly high punching resistance.
  • FIG. 3 shows an enlarged view of a central portion of the 1 .
  • the punching shear reinforcement elements 2 arranged along the circumference around the support axis A can be seen, which are preferably arranged concentrically around the support axis A at a distance from one another. Between the belt legs 9 of the punching shear reinforcement elements 2 are in the end of the Belt legs 9 positioned in pairs of double-headed dowels 3 in order to efficiently dissipate shear forces.
  • two double-headed dowels 3 are connected to one another at a distance from one another, preferably rigidly, with a spacer element 15 .
  • a pair of double-headed dowels is formed, which is easy to position.
  • 4 shows a side view as an example of a schematic representation of two double-headed dowels 3, which are rigidly connected to one another at their upper heads 13 with a spacer element 15, which is formed, for example, with a sheet metal strip.
  • figure 5 shows the pair of double-headed dowels 4 from above view.
  • double-headed dowels 3 can be arranged in a stable and practical manner, and in particular a uniform spacing of the double-headed dowels 3 in the reinforcement arrangement 1 can be implemented.
  • such a pair of double-headed dowels in the reinforcement arrangement 1 of 1 respectively. 3 be used.
  • a pair of double-headed dowels in the reinforcement arrangement 1 of 1 respectively. 3 be used.
  • a pair of double-headed dowels preferably different pairs of belt legs formed with the belt legs 9, which form different angles ⁇ , each have a pair of double-headed dowels. It is favorable if a pair of double-headed dowels is arranged between the chord legs 9 of a majority, in particular of all, of the pairs of punching shear reinforcement elements. Alternatively or additionally, a pair of double-headed dowels can also be arranged between immediately adjacent chord legs 9 of different pairs of punching shear reinforcement elements.
  • the double-headed dowels 3 are usually formed with a dowel rod 12, at the ends of which a widened head 13, 14 is arranged.
  • An upper head 14 and a lower head 13 of the double-headed dowel 3 are generally of essentially the same size, preferably with an identical shape. However, it can also be favorable if the upper head 14 and lower head 13 have a different size and/or shape.
  • the lower reinforcement layer 16 is generally in the form of a conventional reinforcement grid, usually formed with transverse struts and longitudinal struts that are welded to one another. Parts of the punching shear reinforcement elements 2 and/or dowels often protrude through the lower reinforcement layer 16 .
  • the reinforcement layer 16 is usually laid parallel to the reference surface. Examples are in 6 schematically shows two interconnected double-headed dowels 3 and a lower reinforcement layer 16 in the form of a reinforcement grid. The lower heads of the double-headed dowels 3 each protrude through the lower reinforcement layer 16 .
  • a lower edge of the lower heads 13 of the double-headed dowel 3 is aligned essentially flush with a lower edge of the lower reinforcement layer 16 .
  • the lower edge of the lower reinforcement layer 16 is generally formed by the lowermost transverse struts 17 of the lower reinforcement layer 16 .
  • an upper reinforcement layer arranged essentially above the punching shear reinforcement elements 2 and double-headed dowels 3 is also provided, which can be configured or aligned in a manner analogous to the lower reinforcement layer 16 .
  • the upper heads 14 of the double-headed dowels 3 can then expediently protrude through the upper reinforcement layer and be aligned essentially flush with an upper edge of the upper reinforcement layer.
  • the upper edge of the upper reinforcement layer is usually formed by the uppermost cross braces of the upper reinforcement layer. It is preferred if a deviation from an exactly flush alignment is less than 10%, in particular less than 5%, of an average thickness of the respective reinforcement layer, in particular an average thickness of its cross braces.
  • FIG. 7 shows a schematic representation of a further reinforcement arrangement 1, which is formed with a combination of several punching shear reinforcement elements 2 and double-headed dowels 3.
  • the reinforcement arrangement 1 of 7 can with the same features and effects as described above, the reinforcement assembly 1 of 1 be trained.
  • no double-headed dowel 3 is arranged between immediately adjacent chord legs 9 of different punching shear reinforcement elements 2 .
  • a double-headed dowel 3 can be arranged between the chord legs 9 of a different number of punching shear reinforcement elements 2 .
  • the pairs of double-headed dowels 3 can be arranged in an analogous manner between directly adjacent chord legs 9 of different punching shear reinforcement elements 2 .
  • the reinforcement arrangement 1 of 1 respectively. 7 be formed with one or more individual double-headed dowels 3 between the respective belt legs 9, although pairs of double-headed dowels are preferred. It can be expedient if several pairs of double-headed dowels and/or both one or more pairs of double-headed dowels and one or more individual double-headed dowels 3 are arranged between the respective belt legs 9 .
  • an increase in load-bearing capacity or punching shear resistance can be achieved with a simultaneously reduced laying effort. Since adjacent longitudinal axes L of the chords 4, 5 of the punching shear reinforcement elements 2 form angle limbs, which convergently face the support axis A, a force distribution directed towards the support 7 can be implemented. With double-headed dowels 3 arranged between the chords 4, 5, preferably arranged in pairs, shear forces can be efficiently absorbed and dissipated via the transverse elements 6 and double-headed dowels 3.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Joining Of Building Structures In Genera (AREA)
EP21182115.2A 2021-06-28 2021-06-28 Agencement de renfort permettant d'augmenter la résistance au poinçonnage, ainsi que procédé associé Withdrawn EP4112833A1 (fr)

Priority Applications (1)

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EP21182115.2A EP4112833A1 (fr) 2021-06-28 2021-06-28 Agencement de renfort permettant d'augmenter la résistance au poinçonnage, ainsi que procédé associé

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Application Number Priority Date Filing Date Title
EP21182115.2A EP4112833A1 (fr) 2021-06-28 2021-06-28 Agencement de renfort permettant d'augmenter la résistance au poinçonnage, ainsi que procédé associé

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3523656A1 (de) * 1984-07-24 1986-02-06 AVI Alpenländische Veredelungs-Industrie Gesellschaft mbH, Graz, Steiermark Schubbewehrungssystem fuer flaechentragwerke
DE4129903A1 (de) 1991-09-09 1993-03-11 Deha Ankersysteme Duebelleiste
DE19756358A1 (de) * 1997-12-18 1999-07-01 Deha Ankersysteme Schubbewehrung für Flachdecken und Dübelleiste hierfür
DE10001595A1 (de) 2000-01-17 2001-07-19 Deha Ankersysteme Bewehrung für Stahlbetondecken
EP2290167A1 (fr) * 2009-08-21 2011-03-02 Sybaco AG Armature de poinçonnement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3523656A1 (de) * 1984-07-24 1986-02-06 AVI Alpenländische Veredelungs-Industrie Gesellschaft mbH, Graz, Steiermark Schubbewehrungssystem fuer flaechentragwerke
DE4129903A1 (de) 1991-09-09 1993-03-11 Deha Ankersysteme Duebelleiste
DE19756358A1 (de) * 1997-12-18 1999-07-01 Deha Ankersysteme Schubbewehrung für Flachdecken und Dübelleiste hierfür
DE10001595A1 (de) 2000-01-17 2001-07-19 Deha Ankersysteme Bewehrung für Stahlbetondecken
EP2290167A1 (fr) * 2009-08-21 2011-03-02 Sybaco AG Armature de poinçonnement

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