EP0318712B1 - Connection device for coupling between a concrete floor and a column, and building - Google Patents

Abstract

The connection device for coupling between a concrete floor (18) and a column (16) has a central diagonal strut (27) with an edge girder (19) bordering this diagonal strut (27), as well as connecting means (20, 24) projecting outwardly and inwardly from the edge girder (19). A central head plate (21) is additionally provided. The connecting means are welded bolts (20, 24). They may, however, also be steel hoops, screw bolts, rolled sections or tubular portions. Compared with the prior art, this connection device exhibits lower material consumption for the same stresses. It provides advantageous force relationships in the region of the support of the floor (18) on the column (16). It therefore requires a minimal amount of material for given force relationships and is thus less damaging to the environment. <IMAGE>

Description

The present invention relates to a connecting device with a horizontally arranged, frame-like edge support for connecting a concrete ceiling to at least one support and a structure with at least one device.

It is known that when concrete ceilings are supported on supports, unless special measures are taken, a so-called punching effect occurs, the support acting as a stamp on the concrete ceiling and punching out a part that normally widens in the ceiling due to excessive tension.

Corresponding precautions have long been taken in order to guide force peaks when the forces are transferred from the concrete ceiling into the column in such a way that such punching phenomena do not occur.

In this sense, a column head for connecting a solid concrete ceiling to a steel profile column with a vertical passage for utility lines has become known, in which construction the head part of the steel profile column is provided with vertical, wing-like steel sheets. In this case, an anchoring part is provided, which consists of rows of stud bolts which are welded to the wing-like steel sheets of the steel profile support. This prop head avoids peak loads, which in particular due to the anchoring part, which consists of dowel bolts. (DE-OS 29 20 044) This column head can only be used for steel profile columns; the basic idea disclosed is therefore not to be used for pure iron-reinforced concrete structures. The headed dowels used are only used for laying on and not for mechanical connection with concrete reinforcing bars.

A reinforced concrete ceiling with at least one vertical support has also become known, in which the connection of the ceiling and the support or supports at or at each connection point is formed by a horizontally arranged element made of steel profile and having at least two angles to one another. The free legs of this element are connected to one another by at least one steel link. Concrete-free space for the passage of lines exists between the legs of the horizontal element and the associated steel connecting link. (CH-PS 430 128)

Furthermore, a metallic column knob is known, which serves as a connecting element between a supporting column on which it is fastened and an armored concrete slab, in which slab it is cast. This column knob consists of several rods which are welded together and which circumscribe a polygon, the ends of the rods projecting from this polygon being self-supporting. These bars or profiles are provided with pins pointing towards the inside of the polygon, which are used for anchoring in the concrete. (CH-A-596 399) That as a composite element serving U-profile also has an upper horizontal continuous leg, which is difficult to introduce reinforcements.

This, like the aforementioned construction, can no longer meet today's requirements.

There is also a prior art structure in which a mushroom has a central opening for inserting a support from above. The plate in the middle opening is subsequently connected to the mushroom, e.g. welded.

This prior publication shows the disadvantage of previous designs, in that the connection between the mushroom and other reinforcing elements partly. done by welding. This process is complex and therefore expensive. It requires special measures at the place where the building is constructed. (EP-A-128 494)

The prior art also includes a support device of an reinforced concrete ceiling provided at least with a vertical steel support, wherein a horizontally arranged element made of a steel profile and having at least two angles to one another is used to connect the ceiling and support at the connection point, the leg of which is formed by at least one steel element are connected to each other to form a steel mushroom. (CH-A 382 950)

Because of the upper, continuous leg of the steel element, this construction requires an extremely careful insertion of the reinforcements into the supporting device for connecting the concrete ceiling to the support, a time-consuming and therefore expensive work that requires very conscientious work.

The present invention aims to provide a connecting device which has a lower steel consumption compared to the prior art, ensures an effortless, safe insertion of reinforcing steels of the concrete ceiling, creates advantageous force relationships in the area of supporting the ceiling on the support and is environmentally friendly.

Such a connecting device is characterized by the wording of claim 1.

The invention is subsequently explained, for example, using a drawing.

Fig. 1

einen Ausschnitt aus einer auf einer Stütze gelagerten Betondecke mit angedeutetem Stanzeffekt,

Fig. 2

einen Ausschnitt aus einer Betondecke mit Stütze mit angedeuteter Abstützungsvorrichtung der Stahlbetondecke mit dem Einbau der Verbindungsvorrichtung gemäss der vorliegenden Erfindung und der Darstellung des Kraftflusses,

Fig. 3

eine Aufsicht auf die erfindungsgemässe Verbindungsvorrichtung gemäss Fig. 2,

Fig. 4,

die erfindungsgemässe Vorrichtung mit

Fig. 4a

Walzprofilen als Randträger mit Verbundmitteln,

Fig. 5,

die erfindungsgemässe Vorrichtung bei der

Fig. 6

Verwendung mit einer Randstütze,

Fig. 7

eine Aufsicht analog Fig. 5 auf eine Eckstütze,

Fig. 8

eine Innenstütze mit Bereich für Durchdringungen,

Fig. 9 bis 12

Aufsichten auf Formvarianten von erfindungsgemässen Vorrichtungen auf Mittelstützen analog Fig. 3,

Fig. 13

Ausschnitte mit Querschnittsvarianten der Vorrichtung,

Fig. 14

einen Ausschnitt aus einer Armierungsführung für eine statisch einwandfreie Verankerung.

In a purely schematic representation:

Fig. 1

a section of a concrete ceiling supported on a support with an indicated punching effect,

Fig. 2

a section of a concrete ceiling with a support with indicated support device of the reinforced concrete ceiling with the installation of the connecting device according to the present invention and the representation of the power flow,

Fig. 3

2 is a plan view of the connecting device according to the invention,

Fig. 4,

the device according to the invention

Fig. 4a

Rolled profiles as edge beams with composite materials,

Fig. 5,

the inventive device in the

Fig. 6

Use with an edge support,

Fig. 7

5 on a corner support,

Fig. 8

an inner support with area for penetrations,

9 to 12

Top views of shape variants of devices according to the invention on center supports analogous to FIG. 3,

Fig. 13

Cutouts with cross-sectional variants of the device,

Fig. 14

a section of a reinforcement guide for a structurally perfect anchoring.

1 shows a support 1 with a concrete ceiling 2, in which construction no special measures for transferring forces from the concrete ceiling 2 into the support 1 are provided, that is to say in particular also no support head. Then the Known outbreak 4, which can collapse the ceiling.

The construction according to the invention shown in FIGS. 2 and 3 shows a support 16 with a frame which serves as an edge support 19 and is made of flat steel, glass fiber reinforced plastic or the like. Furthermore, outer and inner composite means 20 and 24 are arranged in a hedgehog-like manner projecting outwards and inwards from the edge carrier 19.

From the inwardly projecting composite means 24, the force on the concrete is represented in a purely ideal way as a force-conducting pressure strut 27, without installing a cross 17, in the support 16.

Any moments as well as forces not taken over by concrete pressure struts can be transferred from beams by installing a cross 17. A pressure plate 21, arranged centrally, transfers these forces to the support 16.

4 and 4a, the construction according to the invention is shown with a support 16 and a frame 28 made of a Z-profile as an edge support. A cross 17 and a pressure plate 21 can also be provided here. The edge support 19 can therefore be operatively connected to the support 16 via concrete pressure struts 27 or steel profiles in the form of the cross 17.

5 to 12 show different variations and applications of devices according to the invention when supporting concrete ceilings. Here are the forms square, rectangular, polygonal, circular, oval or other shapes are provided.

Fig. 13 shows excerpts, among others. 2 and 4, in different versions. Edge supports 19 and 28 with or without additional supports 17 arranged in the cross 17 or laid in the diagonals can be used as main structures. Shapes can be used for these flat or wide flat sheets, double T or T rolled profiles or other types of composite profiles and composite structures made of appropriate materials.

The edge beams 19, 28, shown here as flat bars or Z-profiles, can also be designed as L-profiles, as box profiles or in any composition or as composite structures.

14 shows a section of a reinforcement guide for a structurally perfect anchoring. On the upper end of the support 16, the edge girder 19 with the composite means 20 is concreted in a concrete ceiling 18, as is analogously e.g. is explained with reference to FIGS. 2 and 3. The ceiling 18 is reinforced by means of reinforcing steels 30. It can be seen from the illustration how the U-shaped reinforcing steel is connected here via the composite means 20 to the edge support 19, the outer surface 31 and inner surface 32 of which are designated in FIGS. 2 and 14.

This embodiment allows a flawless, clear transfer of forces from the ceiling 18 in the support 16. Thanks to this new construction, the troublesome problems with the lower reinforcement, here in the form of steel 30, are finally a thing of the past with regard to anchoring, cutting lengths and welded connections; because the composite means, for example in the form of bolts 20, are not welded to the reinforcing mesh, the bottom of the U-shaped steels 30 preferably touching the frame.

Welding studs, steel brackets or helically or spirally wound rods, rolled profile sections or pipe sections of any shape and material, in particular also Z-profile frames, serve as the connecting means.

Flat or wide flat sheet is normally used for the head plates. Their shape can be square, rectangular, circular or star-shaped. But it is also possible without constructing these head plates and dimensioning the crosses accordingly.

The devices according to the invention allow horizontal and vertical cutouts in the ceiling. They are particularly suitable for medium to large loads, but are material and therefore cost-saving for them. They form complete units with a relatively small installation weight and are inexpensive in every respect. They also comply with the SIA 160, 162 standard.

With these, based on a common basic idea Constructions transfer the external forces to a frame-like structure via external composite materials and from there to internal composite materials. From here, these forces arrive as pressure forces on a pressure strut, which transmits these forces to the support.

The inner connection means 24 must be closer to the upper end plane of the ceiling, which is normal to the support, than the outer connection means 20, so that the pressure forces introduced into the pressure strut form a minimum inclination angle ψ with this end plane, which is greater than 25 according to SIA standards ° should be. If this angle becomes too small, several frames with composite materials must be provided to ensure that the forces are applied at an angle> 25 ° to the support.

The new construction explained in detail offers the greatest possible degree of safety and improves the bending strength in the contact area. In addition, it enables perfect reinforcement management and thus optimal force transmission. It is therefore particularly well suited for absorbing high punching loads.

• a) keine Schubarmierung notwendig, da
  
  eff. < Als
  
  zul.
• b) alles vollständig einbetoniert. Es gibt keine vorstehenden Teile.
• c) eine einfache Bewehrungsführung sichergestellt, da alle Verbundmittel, z.B. die Bolzen 20, in einer Ebene liegen.

It is therefore advantageous

• a) no shear reinforcement necessary because
  
  eff. <As
  
  perm.
• b) everything completely concreted. There are no protruding parts.
• c) simple reinforcement routing ensured, since all the composite means, for example the bolts 20, lie in one plane.

These connecting elements are referred to as "hedgehogs", in particular as torn hedgehogs.

It may be necessary, especially in the case of recesses within the edge girders, e.g. reinforce cruciform central straps.

Claims (8)

1. A connection device comprising a framelike edge beam (19) to be disposed horizontally for connecting a concrete ceiling (18) to at least one support (16), characterized in that the edge beam (19) has a flat outer surface (31) outside the region of its bottom edge, with said region being provided exclusively with outwardly facing connecting members (20) and the region of the top edge of the edge beam (19) being provided on its inner surface (32) with connecting members (24) projecting into the interior of the edge beam (19), so that forces (R) acting in the construction (16, 18) from outside on the outwardly facing connecting members (20) are transmitted through the edge beam (19) to the connecting members (24) projecting into the interior of edge beam (19), and therefrom to the support (16) through the concrete (27) in the edge beam (19), and on erection of the construction (16, 18) free access is provided from above for fitting reinforcements (30) almost in contact or in contact with the outer surfaces (31) of the edge beam (19) (Figure 2).
2. The device according to claim 1, characterized in that the edge beam is provided in the form of a partially opened frame (19).
3. The device according to claim 1 or 2, characterized in that the connecting members (20, 24) are welded pins, stirrups, bolts or tie rods, laminated profile or tube sections or twisted bars.
4. The device according to one of claims 1 to 3, characterized in that the connecting members form groups located in the same planes in the frame sides.
5. The device according to one of claims 1 to 4, characterized by one or several central beams (17) disposed crosswise in the edge beam.
6. A building with at least one device according to one of claims 1 to 5, characterized in that a compression plate (21) is laid on the support (16).
7. The building according to claim 6, characterized by several continuous edge beam frames (28, 19).
8. The building according to claim 6 or 7, characterized in that connecting members (20) of the device in contact with reinforcement parts (30) are loose operatively coupled therewith (Figure 14).

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