WO2000005461A1 - Dalle en beton arme et element d'armature de cisaillement pour l'armature de cisaillement de dalles en beton arme - Google Patents

Dalle en beton arme et element d'armature de cisaillement pour l'armature de cisaillement de dalles en beton arme

Info

Publication number
WO2000005461A1
WO2000005461A1 PCT/DE1998/003004 DE9803004W WO0005461A1 WO 2000005461 A1 WO2000005461 A1 WO 2000005461A1 DE 9803004 W DE9803004 W DE 9803004W WO 0005461 A1 WO0005461 A1 WO 0005461A1
Authority
WO
WIPO (PCT)
Prior art keywords
shear reinforcement
reinforced concrete
profile
concrete slab
reinforcement element
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.)
Ceased
Application number
PCT/DE1998/003004
Other languages
German (de)
English (en)
Inventor
Hans Frisch
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU63114/99A priority Critical patent/AU6311499A/en
Priority to DE29820985U priority patent/DE29820985U1/de
Publication of WO2000005461A1 publication Critical patent/WO2000005461A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional [3D] extent, e.g. lattice girders
    • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs

Definitions

  • the invention relates to a reinforced concrete slab and a shear reinforcement element for shear reinforcement of reinforced concrete slabs according to the preamble of claims 1 and 6.
  • punched effects can occur in the case of supported reinforced concrete slabs in the transition area to the support, i.e. that at high loads on the reinforced concrete slab, the support punched through the reinforced concrete slab due to excessive shear stress.
  • the tear lines run obliquely in the reinforced concrete slab from the bottom inside to the top outside, so that, seen spatially, a so-called punching mushroom forms at the upper end of the support.
  • Reinforced concrete slabs with shear reinforcement devices are therefore known from the prior art, which are intended to counteract the punching-out effect.
  • a generic reinforced concrete slab with such a shear reinforcement device is in DE 41 29 903 A1 described.
  • Dowel strips are used as shear reinforcement elements for the reinforced concrete slab in the area of a column, each with a horizontal flat steel, on which several vertical head dowels are welded with their free ends at intervals.
  • the flat steel lies under a lower reinforcement layer of the reinforced concrete slab.
  • Each head dowel has a dowel head that protrudes through an upper reinforcement layer of the reinforced concrete slab and an elongated, cylindrical dowel shaft that is arranged perpendicular to the horizontal central plane of the reinforced concrete slab.
  • the known reinforced concrete slab has the disadvantage that the head dowels are relatively short due to their arrangement perpendicular to the central plane of the reinforced concrete slab for a given ceiling thickness.
  • the length of a dowel shaft remaining above or below an expected tear line is also relatively small. This results in only a limited anchorage of the head dowels in reinforced concrete and only a small ability to absorb the forces prevailing in the column area. As a result, the head anchors can break out of the reinforced concrete slab with a high ceiling load.
  • the object of the invention to provide a reinforced concrete slab and a shear reinforcement element, by means of which the forces occurring in reinforced concrete slabs in the area of supports and supports can be better absorbed and by which, in particular, shear reinforcement which is more reliable and less expensive to manufacture is ensured.
  • This object is achieved according to the invention in that the shear reinforcement elements of the reinforced concrete slab are arranged obliquely to this central plane in the region of a central plane of a reinforced concrete slab and extend transversely to the expected crack lines. in the further this problem is also solved in that the shear reinforcement elements have a Z or a double Z profile.
  • Claim 1 has the advantage that the shear reinforcement elements are longer due to their oblique arrangement in the reinforced concrete slab than in a vertical arrangement, which results in a greater installation depth of the reinforcement elements in the reinforced concrete. Since the force absorption capacity of the reinforcement elements is proportional to their installation depth, the inclined arrangement not only results in better anchoring in reinforced concrete, but also a higher force absorption capacity.
  • the design of the shear reinforcement elements as a Z or double Z profile results in a particularly favorable reinforcement geometry, since the inclined central web of the profiles in the reinforced concrete can be arranged essentially perpendicular to the expected crack lines and the punching forces can thereby be optimally absorbed.
  • the legs of the Z or double Z profile which project in opposite directions from the central web, ensure that they can engage in congruent upper and lower reinforcing bars of the reinforced concrete slab.
  • the Z or double Z profiles can be individually pivoted about an axis of rotation perpendicular to the profile plane before the concrete is poured. Then the legs of the Z or double Z profiles intended for engagement in the upper and lower reinforcement layer move on circular paths around the axis of rotation, as a result of which, depending on the angle of rotation, the vertical extension of these profiles to the respective one Can adjust the thickness of the reinforced concrete slab within a certain range.
  • This means that a single size of a reinforcement element can be used for reinforced concrete slabs of different thicknesses, which reduces the number of different reinforcement elements.
  • a particularly preferred development of the invention provides that the free ends of the legs are hook-shaped towards the central web of the Z or double Z profile. As a result, the hook ends of the legs can be hung on the reinforcement bars of the upper and / or lower reinforcement layer, which results in a reliable positive connection with them and a particularly simple assembly.
  • the design of the shear reinforcement elements as a one-piece Z or double Z profile rails with a plate-like central web and legs has the advantage that the loads are not a point load, but rather a surface load from the shear reinforcement element to the concrete or as a line load from the shear reinforcement element to the reinforcement bars upper and lower reinforcement layer are transferred.
  • profile rails are standard parts and can be produced easily and cheaply as extrudates.
  • Figure 1 is a side sectional view through a preferred embodiment of a reinforced concrete slab according to the invention with shear reinforcement elements in the form of a Z-profile.
  • Fig. 2 is a front view of a mounting bracket for mounting a
  • FIG. 3 shows an isometric illustration of a preferred embodiment of a shear reinforcement element according to the invention with a Z-profile;
  • Fig. 4 is a sectional view of the reinforced concrete ceiling along the
  • FIG. 5 shows a side view of a shear reinforcement element with a Z-profile in the pivoted position
  • Fig. 6 shows a further embodiment of a shear reinforcement element according to the invention in the form of a double Z profile.
  • the reinforced concrete slab 1 according to the invention shown in a preferred embodiment in FIG. 1 is provided in a known manner with an upper reinforcement layer 2 and a lower reinforcement layer 4, each of which is formed by a grid of round bars 6.
  • the reinforced concrete slab 1 is further supported by a support 8 which extends perpendicular to the central plane 10 of the reinforced concrete slab 1. If the ceiling load is too high, the support 8 tends to punch through the reinforced concrete plate 1, within which the crack lines 12, which can be clearly seen in FIG. 1, then form.
  • a shear reinforcement device 14 cast into the reinforced concrete slab 1 is provided, which has individual shear reinforcement elements 16 with a Z-profile 18. Such a Z-profile 18 is through an oblique central web 20 and through an upper leg
  • the central web 20 is arranged obliquely in the region of the central plane 10 of the reinforced concrete plate 1 relative to the latter and the angle ⁇ formed between the central plane 10 and the central web 20 of the Z-profile 18 lies in one
  • Angular range from 20 to 70 degrees, preferably in a range from 38 to 52 degrees.
  • the central webs 20 of the Z-profiles 18 run transversely to the expected crack lines 12 in the reinforced concrete slab 1 and preferably essentially perpendicular to them.
  • Leg 22 and the angle ⁇ between the central web 20 and the lower leg 24 are also in a range from 20 to 70 degrees, preferably in the range from 38 to 52 degrees.
  • the upper and lower legs 22, 24 are hook-shaped at their free ends, the two hook parts 26 formed thereby each pointing towards the central web 20.
  • the central web 20 of the Z-profile 18 projects through the upper reinforcement layer 2 of the reinforced concrete slab 1, the hook part 26 of the upper leg 22 engaging over a crossbar 28 of the upper reinforcement layer 2 and hooking onto it.
  • the lower leg 24 engages under a mounting bracket 30, which is shown in a side view in FIG.
  • the mounting bracket 30 has at its two free ends a hanging section 32, which is separated by a shoulder from a central elevation 34.
  • Such a mounting bracket 30 is arranged in the installed position between and perpendicular to two adjacent longitudinal bars 36 of the lattice of the lower reinforcement layer 4, one hanging section 32 each projecting laterally beyond the respective longitudinal bar 36 and engaging it under it (FIG. 4). As shown in FIG. 1, the mounting bracket 30 is then rotated upward about its longitudinal axis against gravity, so that its central elevation 34 projects upward. The lower leg 24 of the shear reinforcement element 16 is hooked into this elevation with its hook part 26, so that a connection is established between the shear reinforcement element 16 and the lower reinforcement layer 4.
  • the mounting bracket 30 makes it much easier to install the shear reinforcement elements 16 between the upper and lower reinforcement layers 2, 4, since it can be easily rotated and displaced relative to the lower leg 24 and the adjacent longitudinal bars 36.
  • the mounting bracket 30 can be used to adapt the height of the shear reinforcement device 14 to different thicknesses of the reinforced concrete plate 1, depending on the height distance of the elevation 34 from the hanging sections 32.
  • the forces are transmitted from the crossbar 28 of the upper reinforcement layer 2 to the upper leg 22 of the shear reinforcement element 16, via its central web 20 to its lower leg 24 and from there to the mounting bracket 30, which in turn transmits the forces to the two adjacent ones Longitudinal bars 36 of the lower reinforcement layer 4 conducts.
  • This is a by the shear reinforcement element 16 and the mounting bracket 30 given positive connection between the upper and lower reinforcement layer 2.4 of the reinforced concrete slab 1.
  • a mounting bracket 30 can be dispensed with, in which case the lower leg 24 of the shear reinforcement element 16 directly engages under the lower reinforcement layer 4 and hooks on one of its transverse bars with its hook part 26. Furthermore, the mounting bracket 30 could also be poured into the concrete without a direct connection to the lower reinforcement layer 4.
  • the shear reinforcement element 16 is preferably designed as a section of a rail 38 with a Z-profile 18, as can be seen from the isometric illustration of FIG. 3.
  • the central web 20 as well as the upper and lower legs 22, 24 are formed like a plate.
  • the transition areas between the central web 20 and the two legs 22, 24 are rounded. Since the
  • the Z-profile 18 can also be composed of individual round or flat steels and form a flat, essentially two-dimensional structure. A plurality of such flat Z-profile structures can also be arranged in parallel and at a transverse distance from one another and connected to one another by means of transverse bars. In one
  • the result is a three-dimensional structure with a Z profile.
  • FIG. 4 shows the installation situation of the shear reinforcement elements 16 in the reinforced concrete slab 1 according to the invention using a Sectional view, which results from an observation along the line III - III of Fig.1.
  • the support 8 is surrounded by a plurality of shear reinforcement elements 16 designed as a Z-profile rail 38. These are each in the spaces between the grid 40 between nodes 42 of longitudinal and transverse bars of the upper and lower
  • Reinforcement layer 2.4 arranged, which are preferably congruent.
  • the shear reinforcement elements 16 could also extend beyond the nodes 42, in which case groove-like recesses are to be provided in the rails 38 with the Z-profile 18 for the passage of the cross or longitudinal bars of the lattice 40 crossing them.
  • FIG. 5 shows a side view of a shear reinforcement element 16 with a Z-profile 18 in the pivoted position.
  • the hook parts 26 of the upper and lower legs 22, 24 move along circular paths. If the shear reinforcement element 16 is pivoted counterclockwise into the position shown in dashed lines in FIG. 5, the vertical distance between the two hook parts 26 of the upper and lower legs 22, 24 decreases.
  • the shear reinforcement elements 16 are adapted to different ones Thicknesses of reinforced concrete slabs 1 are possible, so that a single size of a shear reinforcement element 16 can be used for ceiling thicknesses of, for example, 20-25 cm.
  • FIG. 6 shows a further embodiment of a shear reinforcement element 16 according to the invention, which is designed as a double Z profile 44, in such a way that a left, upper leg 46 together with the central web 48 and a right, lower leg 50 a first Z-profile and a right, upper leg
  • the legs 46, 50 and 54, 56 belonging to a first or second Z-profile and each lying diagonally opposite one another are preferably each of the same length and parallel to one another.
  • the double Z profile 44 has the same advantageous properties as the simple Z profile 18.
  • the free ends of the legs 46, 50, 54, 56 can each be designed as a hook part.
  • the double Z profile 44 can also be adapted to different thicknesses of reinforced concrete slabs 1 by rotation about an axis of rotation perpendicular to the profile plane.
  • Legs 50, 56 is located in the immediate vicinity of the lower reinforcement layer 4.
  • the connection of this lower leg to the nearest transverse or longitudinal bar of the lower reinforcement layer 4 can then be carried out by an assembly bar 30 according to FIG.
  • the larger number of legs results in a larger number of

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

L'invention concerne une dalle en béton armé (1) comportant un dispositif d'armature de cisaillement (14) situé dans la région d'appuis (8) et de supports et comportant au moins un élément d'armature de cisaillement (16) s'étendant d'une position inférieure de cisaillement (4) à une position supérieure de cisaillement (2). Les éléments d'armature de cisaillement (16) sont disposés dans la région d'un plan médian (10) de la dalle en béton armé (1), en biais par rapport à celui-ci, et s'étendent transversalement par rapport aux lignes de fissurage (12) escomptées. Les éléments d'armature de cisaillement (16) peuvent présenter un profil en Z (18) ou un double profil en Z.
PCT/DE1998/003004 1998-07-20 1998-10-07 Dalle en beton arme et element d'armature de cisaillement pour l'armature de cisaillement de dalles en beton arme Ceased WO2000005461A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU63114/99A AU6311499A (en) 1998-07-20 1998-10-07 Reinforced concrete slab and shear reinforcement element for reinforced concrete slabs
DE29820985U DE29820985U1 (de) 1998-10-07 1998-11-24 Schubbewehrungselement zur Schubbewehrung von Stahlbetonplatten und Stahlbetonplatte

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29812891.8 1998-07-20
DE29812891U DE29812891U1 (de) 1998-07-20 1998-07-20 Schubbewehrung im Stützenbereich

Publications (1)

Publication Number Publication Date
WO2000005461A1 true WO2000005461A1 (fr) 2000-02-03

Family

ID=8060109

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/003004 Ceased WO2000005461A1 (fr) 1998-07-20 1998-10-07 Dalle en beton arme et element d'armature de cisaillement pour l'armature de cisaillement de dalles en beton arme

Country Status (3)

Country Link
AU (1) AU6311499A (fr)
DE (1) DE29812891U1 (fr)
WO (1) WO2000005461A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1180565A1 (fr) 2000-08-08 2002-02-20 Philippe Menetrey Armature flexible de connexion pour le renforcement de structures en béton
EP1630315A1 (fr) * 2004-08-21 2006-03-01 Schöck Bauteile GmbH Élément de construction pour armature de cisaillement et de poinconnement
AT500709A1 (de) * 2004-12-01 2006-03-15 Stefan L Burtscher Durchstanzbewehrung für platten
RU2433228C1 (ru) * 2010-04-15 2011-11-10 Сергей Михайлович Анпилов Арматурный каркас железобетонных изделий

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0414485A2 (fr) * 1989-08-21 1991-02-27 Square Grip Limited Armature de cisaillement pour tête de colonne
EP0781891A1 (fr) * 1995-12-30 1997-07-02 Ancotech Ag Armature pour planchers à dalles supportés par des colonnes, élément d'armature de cisaillement ainse qu'un procédé pour la fabrication d'une armature

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0414485A2 (fr) * 1989-08-21 1991-02-27 Square Grip Limited Armature de cisaillement pour tête de colonne
EP0781891A1 (fr) * 1995-12-30 1997-07-02 Ancotech Ag Armature pour planchers à dalles supportés par des colonnes, élément d'armature de cisaillement ainse qu'un procédé pour la fabrication d'une armature

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1180565A1 (fr) 2000-08-08 2002-02-20 Philippe Menetrey Armature flexible de connexion pour le renforcement de structures en béton
EP1630315A1 (fr) * 2004-08-21 2006-03-01 Schöck Bauteile GmbH Élément de construction pour armature de cisaillement et de poinconnement
AT500709A1 (de) * 2004-12-01 2006-03-15 Stefan L Burtscher Durchstanzbewehrung für platten
AT500709B1 (de) * 2004-12-01 2006-08-15 Stefan L Burtscher Durchstanzbewehrung für platten
RU2433228C1 (ru) * 2010-04-15 2011-11-10 Сергей Михайлович Анпилов Арматурный каркас железобетонных изделий

Also Published As

Publication number Publication date
DE29812891U1 (de) 1999-01-14
AU6311499A (en) 2000-02-14

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