EP1387910B1 - Connector element and method for connecting a prefabricated concrete piece with a section of a building - Google Patents

Abstract

The invention relates to a connector element (10) and a method for connecting a prefabricated concrete piece (18) with a section of a building (20). According to the invention, a simplified construction and an improved transverse force transfer between a prefabricated concrete piece (18) and a section (20) of a building compared to conventional techniques may be achieved with a connector element which may be set in a prefabricated concrete piece and serves as the connection between the prefabricated concrete piece and a section of a building. Said connector element comprises at least one element (12), running essentially in the connection direction, which defines a laterally open or closed chamber, running in the direction of connection. Said element (12) is used for direct production of the connection between the prefabricated concrete piece and the section of the building, by applying, for example, an anchoring plate (28) to said element. Welded-on transverse struts, bars or similar can thus be avoided.

Description

Technical area

The invention relates to a connecting element which is pourable into a precast concrete part and the connection of a precast concrete part with a building section, in particular a further precast concrete part is used, and a precast concrete part with such a connecting element. Moreover, the invention relates to a cover which can be fastened to the connecting element. Furthermore, the invention relates to a method for connecting a precast concrete part with a building section.

In reinforced concrete construction, it is customary to assemble load-bearing reinforced concrete structures from individual precast concrete elements. In this case, on the one hand, the individual precast concrete parts must be executed by suitable reinforcements so that they meet the requirements in terms of strength. Furthermore, forces must be transferred between individual precast concrete elements. This is done essentially by connecting elements, which have on the one hand a portion for connection to another precast concrete part and on the other hand one or more reinforcing bars, which serve to transfer the forces from the precast concrete part in the connecting portion and thus to the adjacent precast concrete part.

State of the art

As Vorbenutzungsgegenstände so-called column feet are known in the market, which are embedded in prefabricated reinforced concrete columns in the foot of a support. The column foot has as a connecting portion substantially a plate which is provided with an opening. Through the opening, a connection with a sleeve by means of a bolt with internal thread, which is formed in the concrete precast element to which the support is to be attached. By a suitable recess in the concrete of the support, the area above the opening in the plate is accessible so that the anchoring bolt can be tightened. A compensation of unavoidable tolerances can be done by an eccentric arrangement of the opening and by a slightly enlarged design of the opening. By such connecting elements, which are referred to as column feet, only tensile forces can be transmitted, which act in the direction of the support. For the transmission of shear forces such a connection can not be used.

In addition, so-called wall shoes are known for the connection between a wall provided as a precast concrete wall and a building section, for example the foundation or a ceiling slab as Vorbenutzungsgegenstände, which are designed as well as the above-described column feet. About a comparatively thick and therefore heavy base plate, which is connected by means of an anchoring bolt with the foundation or the ceiling plate, tensile forces from the wall in the building section to which the wall is mounted, can be initiated.

In structural engineering, for example, as a result of the wind pressure also horizontal stresses occur, which must be dissipated by lateral forces in wall and column components in the foundation. However, the described column feet are not suitable for the introduction of such transverse forces of walls or columns in the foundation or adjacent to the respective wall ceiling plate. For the interpretation in terms of the transmission of shear forces namely the transmission of power between the head of the anchor bolt and the base plate is not sufficient. Furthermore, as stated above, the opening in the base plate can not be made so accurate that the interaction with the anchoring bolt to be screwed for the transmission of Transverse forces can be used, since in this area unavoidable tolerances must be compensated. In addition, in the known wall shoes always the problem that the compensation of tolerances is possible only to a limited extent.

Furthermore, the disclosure AT 374 531 an anchoring structure that is concreted into a foundation to anchor a component to the foundation. Although the anchoring structure allows for lateral force introduction into the foundation, much like a cast-in bar, the document does not disclose transverse force transmission between foundation and component unless the component to be connected is made of steel and a transverse force tooth, eg a piece of pipe, is welded. Thus, the anchoring structure has a complicated structure with a high number of parts and welded joints.

Furthermore, the disclosure US 2,280,080 a connecting element which is concreted in reinforced concrete parts and has an elongated opening in which a fastening screw with a nut which engages in the connecting element, is displaceable. The anchoring of the connecting element in the concrete takes place primarily by the shape of the connecting element itself and by additionally in the transverse direction (parallel to the concrete surface) inserted reinforcing rods. Finally, the reveals EP 0 779 309 A1 a connecting or anchoring element made of plastic. The anchoring element comprises a Y-shaped hollow rail into which a V-shaped nut is inserted in order to screw into this an anchoring rod. Furthermore, the anchoring element has receptacles in which reinforcing bars can be loosely inserted, wherein the hollow rail extends substantially parallel to the surface of the reinforced concrete component into which it is installed.

Presentation of the invention

It is an object of the present invention to provide a fastener for precast concrete elements that has a simplified construction and improved lateral force transmission over the prior art. A further object of the invention is to provide a method for joining a precast concrete part to a building section, which is simple to perform and improves the transmission of transverse forces between a prefabricated concrete part and a building section.

The solution of this object is achieved by the connecting element according to claim 1 and the method for connecting a precast concrete part with a building section according to claim 17.

The invention is based on the idea to provide a connecting element, the direct, d. H. without a larger number of components, a lateral force-stiff connection between concrete or reinforcement of the finished part and a building section allows.

Accordingly, the connecting element according to the invention is pourable into a first precast concrete part and thereby serves the connection of the first precast concrete part with a building section, in particular a second precast concrete part, in a connecting direction in which tensile forces are transmitted and perpendicular to the transverse forces are transferable. This connection is formed, for example, by tightening an anchoring bolt in the connecting direction, in which tensile forces can be transmitted after tightening. According to the invention, the connecting element has at least one element extending substantially in the connecting direction, which defines a space extending in the connecting direction and open in the connecting direction, laterally open or closed. This item will be for the Training the connection used with another building section. As a result, the element (s) defining the described space differ from box-like elements known in the prior art for keeping a mounting space in the vicinity of the connection element when pouring a connecting element in a precast concrete part. Rather, by means of the at least one described element which extends in the connecting direction, the connection with a second precast concrete part or other section of building directly formed, for example by an anchor plate is placed on an upper edge of this element to which an anchoring bolt is tightened in such a way that the connection with another building section takes place. Furthermore, at least one permanently attached to the connecting element, in particular welded reinforcing steel is provided for anchoring the connecting forces in the finished part.

The advantages achieved with the connecting element designed according to the invention consist, in particular, in the fact that the element extending in the longitudinal direction is used directly for producing the connection, for example by placing an anchor plate directly on this element. This makes it possible to dispense with welded cross struts, bars or the like.

It should be noted that the element extending substantially in the connection direction may be designed in many different ways. For example, two largely straight and flat plates may be provided, for example, parallel to each other, in the connecting element according to the invention that a space is defined between the plates, which is open at the side, but can be used advantageously in the manner described below. Further, a portion of an L, V or U profile may be provided as the connecting direction extending member. In any case, the element is preferably provided with a square tube or rectangular shape as a hollow profile. Since this embodiment is currently preferred, reference will be made in particular to the use of a hollow profile to which the concrete or reinforcing bars are directly attached. However, it should be understood that the invention is not limited thereto, but that any configuration of the largely in the connecting direction extending element offers, by means of which on the one hand, the effects described below of the space formed thereby and the advantageous compensation options are used in terms of tolerances can.

The use of the largely extending in the connecting direction element, in particular a hollow profile in terms of compensating for tolerances has the significant advantage that the opening of the hollow profile is effectively the area within which Tolerances can be compensated. Namely, the connecting element according to the invention is in fact combined with an anchoring bolt and an anchor plate, which has a suitable size for being placed across the opening at the upper opening of the hollow profile and resting on the edges of the profile. On the anchor plate is the head of an anchoring bolt or a nut and possibly an optionally provided washer. The anchoring bolt extends through an opening in the anchor plate in the sleeve of that section of the building, for example, the foundation or a ceiling plate with which the precast concrete element provided with the connecting element according to the invention is to be connected. The anchoring bolt may also be part of a differently shaped armature in the first component, such as a welded construction. It can be seen that is given by the comparatively large opening area of the hollow section according to the invention provided a comparatively extensive mobility of the prefabricated concrete part with respect to that part, with which this is to be connected, as well as with respect to its cast-in sleeves and accordingly with respect to the anchoring bolt and the anchor plate screwed therein ,

In addition, as it were along the generatrices of the inventively provided hollow profile, the reinforcing bars over a considerable length, namely the length of the hollow profile are welded, so that here a reliable connection can be ensured. In particular, no additional welding is required on the connecting element according to the invention even after its pouring into a precast concrete part. It should be mentioned that the hollow profile according to the invention can be made comparatively thin-walled, and thus leads to a material saving and less expensive execution than the known in the prior art, relatively thick Baseplates. In particular, a wall thickness of about 8 mm is currently preferred for the hollow profile.

Preferred developments of the connecting element according to the invention are described in the further claims.

As mentioned, a hollow profile is preferred for the extending in the direction of connection element, with which preferably at least one extending in the axial direction of the hollow profile reinforcing steel is connected. The axial direction of the hollow profile is understood to be that direction in which the hollow space of the hollow profile extends. In this direction, at least one reinforcing steel is attached to the hollow profile, preferably welded to it. In other words, in the final installation state, in the case that the connecting element according to the invention is cast in a concrete precast element provided as a wall, the reinforcing steel as well as the intended section of a hollow profile extend in the vertical direction. The hollow profile is therefore preferably open at its top and bottom and closed at its sides by the corresponding wall sections of the hollow profile.

Although the cross-sectional shape of the hollow profile, which is provided for the connecting element according to the invention, is arbitrary, a hollow profile with a rectangular cross-section is preferred. It is further preferred that reinforcing steels are provided at all four corners of the rectangular hollow profile. This embodiment has proved to be sufficiently stable for all applications. The reinforcing bars can be four single, straight bars. Alternatively, the four reinforcing bars can be combined in pairs to form two preferably one-piece, U-shaped brackets, which are welded to the hollow profile with the straight legs. Also individual reinforcing bars with hooks or end anchors are possible. Also conceivable are any serving for anchoring longitudinal rods made of steel, smooth, ribbed or threaded, which can form an anchoring mechanism.

The connecting element is particularly well suited for use in truss or beam precast elements when the element extending in the connection direction has a substantially U-shaped cross-section. This makes it possible that the finished part through the lateral opening of the U-shaped element through directly on the building section, for example, a console or a column head, can be placed so that no horizontal threading or mating of the components to be joined is required. At the same time a secure transferability of shear forces, which dominate in Binder- or beam finished parts against normal forces, thereby achieved.

An especially simple and economically producible connecting element is obtained if the element extending in the connecting direction is formed by two individual elements each having an L-shaped cross-section, which are preferably connected to a rectangular hollow profile, reinforcing steels preferably being arranged in the region of the connection. As a result, a very rigid connection is achieved, wherein the reinforcing bars serve simultaneously as connecting rods of the longitudinally extending element.

Particularly in the case of predominant longitudinal or normal force transmission in the finished part to be joined, it is particularly advantageous to arrange the reinforcing steel or bars symmetrically with respect to at least one axis, in particular the main axes of the element extending in the connecting direction. This will be a uniform Ensure distribution of stresses, and tilting or horizontal forces) are avoided.

According to one embodiment of the invention, it is preferred that the one or more reinforcing bars are arranged offset inwardly relative to the outer periphery of the extending in the connecting direction element. In this way, the space required for the connecting element is reduced in the finished part, which is particularly advantageous in narrow or highly reinforced components and facilitates the introduction of the concrete on the edge of the component. The force is thus less close to the edge, which results in a more favorable load bearing capacity in concrete.

As stated above, the connecting element according to the invention may indeed be provided without an anchoring bolt and an anchor plate directly combined therewith. In this case, it would have to be combined with a suitable anchoring bolt and an anchor plate at the latest when connecting with another precast concrete element or another section of the building. However, it is preferred according to the invention that a combination of the connecting element according to the invention, an anchoring bolt, optionally supplemented by a nut, an anchor plate and optionally a washer is provided.

According to a development of the invention, a plurality of connecting elements can advantageously be combined with one another by being connected to one another by one or more reinforcing steel bars. This gives a unit that is simple and inexpensive to produce and has a low weight and a small footprint. In addition, the combination of the invention allows a uniform distribution of the connecting and anchoring forces, which is advantageous in particular for components with larger cross sections or high stresses is. At the same time larger component areas can be covered with a single, lightweight unit. In order to ensure an adequate rigidity of the unit formed from several connecting elements according to the invention, the connecting reinforcing steel bars are preferably fixedly attached to the elements extending in the longitudinal direction, in particular welded. But initially also loosely arranged around the elements bracket 34 stabilize the mechanism in the hardened concrete advantageous. Output forces from eccentric introduction of force through the connecting element 10 itself are absorbed both by loose and welded bracket.

In addition, the use of a unit formed by a plurality of fasteners also contributes to the carrying capacity of the finished part itself, in particular when the elements are enclosed according to a development of the invention by the connecting reinforcing steel bow. As a result, a banding effect of the component cross-section is achieved, which is often required in particular in highly stressed connection areas.

Furthermore, the invention relates to a precast concrete part with at least one connecting element in one of the embodiments described above. As a result, the advantages described for the connecting element can also be used for a precast concrete part which is provided directly with it. Furthermore, the advantages according to the invention also result for a connection between a precast concrete element, which has at least one connecting element according to the invention, and another section of a building.

The connecting element according to the invention proves to be advantageous not only with regard to the simplicity of the design or the compensation of tolerances, but also with regard to the transferability of transverse forces. Because the hollow profile has a certain extent in Having connecting direction or axial direction, the anchoring bolt can be used as a shear force mandrel and can be designed accordingly. The possibility of using the anchoring bolt as a shear force mandrel consists in that according to the invention the cavity of the hollow profile and / or a mounting cavity provided in the vicinity of the connecting element installed in a precast concrete element is filled with concrete, in particular fast-hardening grouting concrete. As a result, the interaction of concrete and anchoring element or bolt can be used for the transmission of shear forces. A review of the required strength properties has already led to a positive result. This possibility given for the first time for fasteners, which are intended for the connection between precast concrete parts and building sections, leads to significant advantages in the construction, since the connections between these components can be used for the transmission of shear forces, and accordingly for the interpretation in terms of Ablation of horizontal or transverse forces can be used in the foundation.

In order to ensure a complete, clean and tight filling of said cavities with concrete, another objective provides a cover which has a filling opening for filling concrete and is preferably fastened to the connecting element in such a way that the cavity covered thereby can be cast with concrete , It should be noted that the liquid poured concrete applies a certain pressure on the attached cover, so that according to the invention by appropriate measures, which are described in more detail below, to ensure that the cover reliably remains on the precast concrete part, and the cavity safely can be shed.

Although the cover of the invention is preferably used in combination with a connecting element and / or a precast concrete part, the cover is an independent component, which in German Utility Model no. 201 08 341.8 described as a priority document of this application and in principle can be used in other areas.

Due to the cover according to the invention, the mounting cavity above as well as the space provided in the connection direction extending element of the connecting element space can be shed after connection of the precast concrete part with a building section in such a way that the connection can be used for the transmission of shear forces. The encapsulation also acts as corrosion protection.

The cover plate or the formwork element can be fastened to the connecting element in an advantageous manner. This ensures that no additional, in particular external holding devices, such as nails, dowels, cross members or other anchoring elements are required for tight coverage of the cover on the surface of the component in the region of the cavity to be cast. In this way, time and labor as well as costs for attaching and securely holding the cover are minimized.

According to the invention, the cover is designed for a particularly simple and clean casting of the mounting cavity by having at least one defined filling opening. This is in contrast to the previously practiced approach, in which usually a mounting cavity was boarded by a board or the like, whereby it was ensured by the appropriate arrangement of the board that concrete could be poured into the mounting cavity. In contrast, the cover of the invention simplifies the Potting the mounting cavity considerably by covering them in any way, covering the cavity, on the precast concrete part is attached, and the defined filling opening is always given the opportunity to fill concrete for potting the mounting cavity. The cover according to the invention is reusable as often as desired and facilitates the clean formation of precast concrete parts and their connections with each other. Alternatively, the cover may also remain on the now filled with solid concrete cavity.

In order to further facilitate the filling of the grouting concrete in the mounting cavity, which is covered by the cover according to the invention, it is preferred that the cover additionally comprises a Einfüllülle or a filling beak on which / the filling opening is formed.

To attach the cover to the precast concrete element or to the connecting element of the same, it has proved to be advantageous to provide at least one fastening opening in the cover, which can cooperate with a wide variety of fastening devices explained in greater detail below.

For example, a reliable and simple attachment of the cover according to the invention by at least one band or strip-shaped element can take place, which can cooperate for example with a portion of a provided in a precast concrete element connecting element. The band or strip-shaped element may be a cable tie, a wire or a sheet metal strip. These extend from a suitable element in the mounting cavity through an opening in the cover and can be tightened or bent on the outside of the cover such that the cover is securely fastened to the precast concrete part. It should be noted that the embodiment in which a cable tie is provided is currently particularly preferred.

This can be ensured in a particularly simple manner by that preferred embodiment in which the cover has at least one example, double-sided adhesive tape, by means of which the cover in the vicinity of the mounting cavity can be fastened.

Furthermore, particularly favorable properties have been found by experiments in that the cover has at least one resilient clip or clip, with which / which the cover is clamped to the inner edge of the mounting cavity.

Although the cover according to the invention is basically to be seen independently of a connecting element which is pourable into a precast concrete part, it is preferred to provide this in combination with such a connecting element.

In this case, a particularly reliable fastening of the cover can take place in that a fastening section in the form of a thread is provided on the connecting element. This may be provided for example in an anchor plate of the connecting element, or at one or more intended for reinforcement to the connecting element reinforcing steel, a nut may be welded. In the thread or the one or more screws can be screwed in such a way that the cover is securely attached.

Finally, the cover according to the invention can in principle be provided independently of a precast concrete part, and it can be used several times to make the mounting cavities of several precast concrete successively filled with concrete. Preferably, however, the cover according to the invention is provided in combination with a precast concrete part, which offers the advantage that the cover in terms of their Dimensions can be adapted to the dimensions of the mounting cavity of a special precast concrete part to always guarantee a reliable operation.

According to another aspect of the present invention, there is provided a method of joining a precast concrete part to a building section according to claim 17. By the method according to the setting of the anchoring bolt perpendicular to its axis relative to the extending in the direction of connection element is achieved that a targeted lateral force transmission between the precast concrete part and the building section can take place. At the same time, the method is characterized by comparatively simple method steps.

According to a development of the method according to the invention, the anchoring bolt is set by filling a cavity defined in the precast concrete element by the cavity extending in the connection direction and / or a mounting cavity provided in the vicinity of the connecting element with concrete. As a result, a particularly stiff and slip-poor lateral force connection is achieved. At the same time, filling ensures corrosion protection of the steel or reinforcement components.

In addition, there may be an advantageous development of the invention is to make the setting of the anchoring bolt by holding elements, preferably wedges and / or screws. In this way, a stable, but possibly also releasable connection can be made by simple means.

Brief description of the drawings

Fig. 1

eine perspektivische Ansicht einer Ausführungsform des erfindungsgemäßen Verbindungselements;

Fig. 2

eine perspektivische Ansicht des erfindungsgemäßen Verbindungselements in einer alternativen Ausführungsform;

Fig. 3

einen Querschnitt durch das erfindungsgemäße Verbindungselement gemäß Fig. 1;

Fig. 4

eine perspektivische Ansicht zweier miteinander verbundener Betonfertigteile mit dem erfindungsgemäßen Verbindungselement im eingebauten Zustand;

Fig. 5 bis Fig. 10

jeweils eine Seitenansicht (a) und einen Querschnitt (b) durch eine Ausführungsform des erfindungsgemäßen Verbindungselements sowie einer Kombination der jeweiligen Verbindungselemente, die in eine Stahlbeton-Fertigteilstütze eingebaut sind;

Fig. 11 und Fig. 12

jeweils eine Seitenansicht (a) und einen Querschnitt (b) von Ausführungsformen des erfindungsgemäßen Verbindungselements, die in ein Stahlbeton-Fertigteilbalken eingebaut sind;

Fig. 13

eine perspektivische Ansicht eines Abschnitts eines Betonfertigteils mit der daran zu befestigenden Abdeckung in einer ersten Ausführungsform;

Fig. 14

eine perspektivische Ansicht eines Abschnitts eines Betonfertigteils mit der daran zu befestigenden Abdeckung in einer zweiten Ausführungsform;

Fig. 15

eine perspektivische Ansicht eines Abschnitts eines Betonfertigteils mit der daran zu befestigenden Abdeckung in einer dritten Ausführungsform;

Fig. 16

eine perspektivische Ansicht eines Abschnitts eines Betonfertigteils mit der daran zu befestigenden Abdeckung in einer vierten Ausführungsform; und

Fig. 17

eine perspektivische Ansicht eines Abschnitts eines Betonfertigteils mit der daran zu befestigenden Abdeckung in einer fünften Ausführungsform.

The invention will be explained in more detail with reference to embodiments shown by way of example in the drawings. Show it:

Fig. 1

a perspective view of an embodiment of the connecting element according to the invention;

Fig. 2

a perspective view of the connecting element according to the invention in an alternative embodiment;

Fig. 3

a cross section through the connecting element according to the invention according to Fig. 1 ;

Fig. 4

a perspective view of two interconnected precast concrete parts with the connecting element according to the invention in the installed state;

Fig. 5 to Fig. 10

each a side view (a) and a cross-section (b) by an embodiment of the connecting element according to the invention and a combination of the respective connecting elements, which are installed in a reinforced concrete precast prop;

11 and FIG. 12

each a side view (a) and a cross section (b) of embodiments of the connecting element according to the invention, which are installed in a precast reinforced concrete beam;

Fig. 13

a perspective view of a portion of a precast concrete part with the cover to be fastened thereto in a first embodiment;

Fig. 14

a perspective view of a portion of a precast concrete part with the cover to be fastened thereto in a second embodiment;

Fig. 15

a perspective view of a portion of a precast concrete part with the cover to be attached thereto in a third embodiment;

Fig. 16

a perspective view of a portion of a precast concrete part with the cover to be attached thereto in a fourth embodiment; and

Fig. 17

a perspective view of a portion of a precast concrete part with the cover to be fastened thereto in a fifth embodiment.

Detailed description of preferred embodiments of the invention

In the following detailed description of preferred embodiments of the invention, the same or corresponding components are designated by the same reference numerals in the different embodiments.

As in Fig. 1 can be seen, there is the connecting element 10, which is formed in the present embodiment as a wall shoe, consisting essentially of a portion of a hollow section 12 and - in the embodiment shown - four each provided at the corners of the hollow section reinforcing steel 14. In the reinforcing steel 14 acts it is known, provided with ribbed reinforcing bars, which have a depending on the application for the forwarding of the forces to be transmitted to be determined length. The reinforcing bars are at the corners of the hollow section 12, which has an approximately rectangular cross section, via fillet welds 16, the better in Fig. 3 are visible, welded. The fillet welds are over most of the length of the Hollow profile 12 is formed. Regarding the hollow profile 12, it should also be noted that, depending on the embodiment, it may have a length of, for example, 80, 95, 120 or 135 mm, viewed in the axial direction, ie in the direction of extent of the reinforcing steel 14. It is understood, however, that the hollow profile may also have other dimensions depending on the application. For the longer side of the rectangular cross-section are currently provided dimensions of 120 or 140 mm, and for the shorter side of the rectangular cross-section dimensions of 60 or 70 mm. The hollow profile can be made comparatively thin-walled by currently a wall thickness of 8 mm is preferred. The reinforcing bars preferably have a length of the order of one meter.

An alternative embodiment is in Fig. 2 shown. Here, the respective reinforcing bars 14 to a length of about 70% of the reinforcing bars 14 according to the embodiment of Fig. 1 be shortened. Incidentally, according to the alternative embodiment, two of the illustrated reinforcing bars 14 are combined to form U-shaped brackets. In other words, the upper, free end of each reinforcing steel 14 shown continues after a substantially right-angled turn into a short transverse web, which leads to a further reinforcing steel 14. The crossbar goes over after a largely rectangular turn in this reinforcing steel 14. These largely U-shaped stirrups, whose free legs, as in Fig. 2 is shown are welded to the hollow section 12, can be integrally formed by double bending a suitably long reinforcing steel. It should also be noted that both the arranged on the short side of the hollow section 12 reinforcing bars 14 may be summarized in this way to form a U-shaped bracket, or that this is done for the two arranged on a common long side of the hollow section 12 reinforcing bars, such as in Fig. 2 is shown.

Out Fig. 3 is, as mentioned, to recognize the connection between the reinforcing bars 14 and the hollow section 12. This is preferably done by welding, in particular by fillet welds 16. It should be noted, however, that the connection can also be made in any other way, provided that the required strength is ensured. The hollow profile is preferably produced by thermoforming and accordingly has rounded corners.

In Fig. 4 the installation situation can be seen when using the connecting element 10 according to the invention. The connecting element 10 is cast in a precast concrete element 18, which is provided, for example, as a wall. Accordingly, the connecting element 10 according to the invention is located at the lower edge of the precast concrete part 18. Here, it serves to connect the precast concrete part 18 to another building section 20, in which it may be a foundation or a ceiling plate. At the required points 20 sleeves are embedded in concrete in this building section, in which an anchoring bolt 22 can be screwed. The tightening takes place in the embodiment shown by a nut 24 which is screwed onto the anchoring pin 22 and rests on a so-called anchor plate 28 via a washer 26. Just as well, the anchoring pin 22 may be embedded in concrete or glued in the building section 20 with an anchoring and protrude from the surface to then cooperate as intended with the connecting element 10.

As in Fig. 4 can be seen, the anchor plate 28 has a size such that it rests with a certain, two-sided projection on the upper edge of the hollow profile. In particular, in the illustrated embodiment, the anchor plate 28 extends in the direction of the shorter side of the rectangular cross section of the hollow profile 12. This configuration, the hollow profile and so that the precast concrete part 18, in which the connecting element 10 is concreted in concrete, to a large extent with respect to the anchor plate 28 and thus with respect to the building section 20 move. As a result, tolerances can be compensated without the existing restrictions. It should be noted that the top and bottom of the hollow section 12 will usually be fully open for this purpose. However, it is not excluded and further allows the realization of the advantages of the invention, when the top and bottom are at least partially closed. In contrast to the base plates hitherto used in the prior art, however, substantially larger openings can be provided here, in particular the upper and lower sides can be largely completely open, since the anchor plate 28 is still safe even with a comparatively extensive mobility of the wall shoe with respect to the anchor plate rests on the upper edge of the hollow section 12. After the correct arrangement of the precast concrete 18, the tightening of the nut 24 takes place.

In Fig. 4 It can also be seen how a mounting cavity 30 is provided on a precast concrete part 18 which is provided with the connecting element 10 according to the invention, which can be cast with the building section 20 after the connection between the precast concrete part 18, so that the cavity of the hollow profile is filled will be, and between the anchoring pin 22 and the filled into the cavity concrete lateral forces can be transmitted as will be described in more detail later.

Essentially, a certain window 30 is recessed in concreting the precast concrete element 18 in an area above the hollow section 12, which is formed by the fact that when concreting the precast concrete 18 in this area a recess body made of Styrofoam is arranged. This recess body can be removed after hardening of the concrete without residue by placing it in a suitable, thin Separation film is welded. Such a recess body is optionally provided together with the connecting element according to the invention. In the assembled state, the recess 30 allows the nut 24 to be tightened by a suitable tool.

The FIGS. 5 to 10 each show a side view and a cross section of an embodiment of the connecting element 10 according to the invention and a combination 36 of the respective connecting elements 10, which are installed in a precast concrete support 18.

Fig. 5 shows four fasteners 10, which are respectively installed in the corners in the foot area of a precast concrete support 18. The fasteners have, similar to the FIGS. 1 to 4 , in each case a hollow section 12, to which two reinforced concrete bars 14 are permanently attached via fillet welds 16. The rods 14 are arranged on the outside of the hollow profile 12 so that they are approximately aligned with the adjacent side surface of the hollow profile. Therefore, reinforcing steel brackets 34 each connecting four connecting members to a connecting unit 36, as in FIG Fig. 5 to recognize flush with the outer surface of the hollow sections 12 and the reinforced concrete bars 14 abut. The reinforcing steel brackets 34 thus enclose the four connecting elements 10 and are fixedly connected to them, for example by welding. Loosely inserted brackets 34 achieve the same structural behavior in the concrete, when this is hardened. In particular, laterally acting output forces are absorbed by the connecting element 10 in the case of an eccentric force attack of the reinforcing steel 14 with respect to the anchoring bolt 22. By surrounding a confinement of the reinforced concrete cross-section is achieved at the same time, which improves the load capacity of the column foot.

Overall, the arrangement of the plurality of connecting elements 10 existing connection unit 36 is a by the arrangement achieved favorable structural behavior with low labor or installation costs. The arrangement of four connecting elements in the component corners, for example, instead of a central, correspondingly enlarged connecting element, not only ensures an improved or more uniform distribution of the stresses, but also increases the bending and shear force capacity of the component. In addition, compared to a central, correspondingly enlarged connecting element material costs and weight can be saved. At the same time, however, the unit 36 is easy to install, since not about four individual elements 10 must be provided and aligned, but the unit 36 can be installed quickly as a whole.

It is also exemplified the arrangement of the mounting hole 30 is shown, which is no longer shown in the other figures for clarity.

Fig. 6 shows an alternative embodiment, different from Fig. 5 distinguished primarily by the fact that the reinforcing bars 14 are arranged offset from the outer edges of the reinforced concrete precast prop inwards. This ensures that more space is available in the outer region of the component, which is often required for anchoring the longitudinal reinforcement of the reinforced concrete precast prop. The increased concrete cover in the overlap area of the anchoring steels with the additional reinforcement reduces the splitting effect and in particular the risk of crack formation in the concrete. In addition, the introduction of the concrete is facilitated on the edge of the component, which is very advantageous especially in highly reinforced components.

Fig. 7 shows a further alternative embodiment, different from Fig. 5 distinguished primarily by the fact that the hollow sections 12 are made substantially round.

Round tubes are particularly economical to produce, so that the overall construction 10 is inexpensive.

Fig. 8 shows yet another alternative embodiment, different from Fig. 5 distinguished primarily by the fact that the longitudinally extending elements are each formed by two individual elements 12 "each having an L-shaped cross-section, which are connected to a rectangular hollow profile, wherein in the region of the compound reinforcing bars 14 are arranged achieved simple production a very rigid connection, the reinforcing bars serve as connecting rods of the L-shaped individual elements 12 "simultaneously.

Fig. 9 a shows another alternative embodiment of the anchoring detail in the side view and in Figure b in cross-section of the anchor, in which the connecting elements 10 are arranged in the side surfaces of the concrete support 18 and do not come to lie in the corners. The four connecting elements 10 are enclosed by reinforcing steel bars 34. The assembly cavities 30 are located above the hollow sections 12. The arrangement of fasteners 10 in the side surfaces of the concrete support 18 instead of their corners, these mounting cavities 30 are particularly easy to close and shed, especially in combination with the cover according to the invention, which will be described in more detail below , The arrangement in the side surfaces beyond a completely symmetrical arrangement of the anchoring rods 14 on the hollow section 12 is possible, which reduces output forces from Lastexzentrizität with respect to the anchoring pin 22.

Fig. 10 shows an arrangement of the connecting elements 10, which is particularly geared to be able to absorb a moment with respect to a bending axis of the support 18 increased. Also, this arrangement is advantageous if, for example, no access to a on the narrow side of the support 18 Mounting cavity 30 is feasible because this support, for example, adjacent to a wall. Again, the symmetrical arrangement of the anchoring rods 14 on the hollow section 12 is possible.

The Figures 11 and 12 each show a side view and a plan view of embodiments of the connecting element 10 according to the invention, which are installed in a precast reinforced concrete beam 18. Although the entire connecting element 10 is indeed installed in the longitudinal direction of the rod-shaped precast concrete part 18 here. However, since it is a beam, the whole arrangement can be seen horizontally.

Fig. 11 shows two fasteners 10, which are respectively installed on the underside of a precast concrete beam 18, which is usually the bending tension side. The fasteners have a portion of a U-profile 12 'to which four reinforced concrete rods 14 are welded via fillet welds 16 in a manner similar to that described above. The U-profiles are installed in the beam 18 so that their opening faces the underside of the beam, so that the interior of the U-profiles 12 'from the outside or down is freely accessible. In this way, a particularly simple and safe installation of the precast concrete beam 18 on the construction site, by the beam 18 on a supporting portion, such as a console of the building, just in the vertical direction can be stored, which in Fig. 11a indicated by an arrow. Thus, no horizontal threading is required and the U-profile 12 'encloses the horizontally disposed anchoring pin 22'. In addition, this arrangement is also preferred in terms of structural behavior of beams, as by the arrangement of the connecting elements 10 on the underside of the beam at the same time the required anchoring and / or force transmission of (running on the underside of the beam) Biegezugbewehrung can take place.

Although in Fig. 11 not shown, the two connecting elements 10 analogous to the FIGS. 5 to 10 also by reinforcing steel hoops, which, however, must allow the free accessibility to the open U-profile 12 'by suitable arrangement to be combined into one unit.

Fig. 12 shows an alternative embodiment, different from Fig. 11 characterized in that one or more connecting elements 10 are provided which have a closed hollow profile 12. The one or more fasteners 10 may be enclosed in the hollow profile portion of brackets 34 when it makes the lateral force removal in the beam 18 statically required. The mounting cavity 30 is then located laterally from the hollow profile 12 and also laterally of the first bracket 34, so that there is no static disadvantage here. In a single arrangement of a connecting element 10, the reinforcing bars 14 with fillet welds 16 can be arranged asymmetrically, but also symmetrically. In the embodiment according to Fig. 12 the anchoring bolt 22 must either be subsequently inserted from the side or the entire component 18 are laterally threaded onto the anchoring bolt 22. The connecting element 10 is also arranged in the region of the underside of the beam for the reasons mentioned above, but somewhat spaced from this. This arrangement is particularly preferred when increased demands are placed on the corrosion and / or fire protection of the precast concrete beam 18. In addition, the beam can be secured by the closed cross section of the hollow section 12 against lifting more effective.

The filling of a mounting cavity with concrete in the region of the above-described fasteners is described below with reference to FIGS. 13 to 17 explained.

In Fig. 13 is a lower corner of a precast concrete 18, such as the one out Fig. 1 shown in the one Mounting cavity 30 is provided to tighten a fastening nut 24 of a connecting element 10 in the precast concrete element 18 can. As can be seen in the figure, the mounting cavity is an approximately rectangular recess with a rectangular front opening. This opening is to be poured after tightening the mounting nut 24 with concrete to form a total, together with the remaining surface of the precast concrete 18, a continuous smooth concrete surface.

In order to facilitate casting with concrete and this in a clean manner, without extensive reworking required to allow the inventive, largely rectangular and slightly larger than the opening of the cavity 30 shaped cover 38 is provided. This is mounted substantially in the direction of the arrows A at the opening of the mounting cavity 30 such that it is covered. In the embodiment shown, the attachment of the cover 38 by means of a fastening screw 40 which is inserted through an opening 42 in the cover 38 and is screwed into a thread 44 which is formed in the case shown in the anchor plate 28 of the connecting element 10. Thus, the position of the opening 42 is matched to that of the thread 44. As a result, the cover 38 is reliably attached to the precast concrete part, and also the pressure of the filled concrete can not solve this from the precast concrete part.

It should be noted that what is not shown in the drawings, it is also conceivable that the cover 38 is fixed by means of wire pins on the precast concrete part, in particular nailed. For this purpose, for example, in the corners of the cover 38 respective openings may be provided to nails wire pins through the openings in the concrete surface of the precast concrete part 18 in the vicinity of the cavity 30. Furthermore, the cover 38 could its surface directed towards the precast concrete element 18, in particular in its edge regions, be provided with double adhesive strips in order to fasten the cover 38 to the edge regions in the vicinity of the mounting cavity 30.

In order to facilitate the filling of Vergussbetons compared to the known in the prior art approach considerably, the cover 38 according to the invention at the top of a defined filling opening 48. This is combined in the embodiment shown with a Einfüllülle 50, which has substantially the shape of a halved funnel. By filling spout 50 remains in the state in which the cover 38 is attached to the precast concrete 18, between the concrete surface and the edge of the Einfüllülle 50, the filling opening 48 through which the grouting concrete can be filled safely and in a reproducible manner. It should be noted that the cover 38 may be made of sheet metal, a solid plastic or any other suitable material. Preferably, the attachment of the cover 38 is such that it is removable from the cavity filled with concrete even after its hardening (see, in particular Fig. 13, 14th . 16 and 17 ).

In Fig. 14 an alternative possibility of attaching the cover 38 according to the invention to a precast concrete element 18, in particular its connecting element 10 is shown. As can be seen in the figure, the connecting element 10 has a plurality of reinforcing bars 14, which in the embodiment shown are mounted in the four corners of the connecting element 10. To the two front reinforcing bars 14, in this embodiment, in each case a nut 54 is welded to allow in each case the insertion of a sufficiently long screw 40. Of course, only one of the nuts 54 may be provided, and the existing nuts may be at other portions of the Fastener or the precast concrete 18 and be attached by other measures than welding.

In Fig. 15 an embodiment of the cover according to the invention is shown, which is held by a plurality of resilient brackets 56 in the mounting cavity. In the embodiment shown, two such brackets are provided on each of the four sides of the cover 38, which are in the vicinity of the corner regions. The brackets 56 may be integrally provided on the cover plate 38 made of metal or plastic. The brackets initially extend from the cover 38, starting a little outside of the edge and then, after forming a kink, to a certain extent roof-shaped again in the direction of the cover. This angled to the inside of the cover 38 section facilitates the introduction of the entire circumference formed brackets in the mounting cavity 30. The brackets 56 are slightly deflected during insertion and then resiliently against the inner surface of the mounting cavity 30, so that also in this embodiment the cover 38 is securely held in the mounting cavity.

This applies equally to the in Fig. 16 shown embodiment in which a cable tie 58 is used to tighten the cover 38 in the mounting cavity 30. For this purpose, the cable tie is looped around an anchoring pin 22 of the connecting element 10, and its ends are guided by an opening 42 formed in the cover 38 to the outside. By a suitable latching fastener 62, the cable tie can be tightened so that the cover 38; held by the anchoring pin 22 and the cable tie 58, securely remains on the mounting cavity.

In the embodiment of Fig. 17 the same principle is used. A metal strip 64 is advantageous is clamped by means of the fastening nut 24 of the connecting element 10 and extends through an opening 42 formed in the slot 38 in this case. The cover is arranged in the direction of the arrows A, guided by the metal strip 64, on the mounting cavity 30. Subsequently, as indicated in the figure, the protruding to the outside end of the metal strip, for example, angled downwards to hold the cover 38 securely to the mounting cavity.

The method according to the invention for connecting a precast concrete part to a building section is described by way of example with reference to FIG FIGS. 4 and 14 and the related description as follows. First, the connecting element 10 is concreted in the region of the abutting surface of the precast concrete part 18 in such a way that in the region of the connecting element, a mounting cavity 30 remains, which is formed for example by a removable Styrofoam Aussparungskörper. After curing of the concrete, the precast concrete element 18 is placed with its abutment surface on the building section 20, which may be a foundation or a ceiling slab. In the case of using the connecting element 10 in the horizontal position for connecting beams, the procedure is analogous, but the arrangement in the concrete beam 18 according to Fig. 11 and 12 performed. The building section 20 may then constitute a wall or a column. The anchoring pin 22 is correspondingly arranged horizontally. The application is particularly advantageous Fig. 11 where, during the assembly of the beam, this is lowered from top to bottom and thus the anchoring bolt 22 is not introduced axially, but perpendicular to the longitudinal axis in the U-profile 12.

In the building section 20, an anchoring bolt 22 is provided, on which the precast concrete part 18 is placed in such a way that it in the connecting element 10, more precisely in its hollow section 12, in Connecting direction extends. Thereafter, an anchor plate 28 is placed on the anchoring pin 22 such that it bears against the hollow profile 12. By subsequent application and tightening a nut 24, possibly with washer 26, on the anchoring pin 22 this is clamped with hollow section 12 and the precast concrete part 18 and the building section 20 in the axial direction of the anchoring bolt. In this case, the tightening of the nut on the mounting cavity 30 can be done from the outside by means of a conventional tool.

Finally, with reference to Fig. 14 , Filling the interior of the hollow section 12 and the mounting cavity 30 with concrete to set the anchoring pin perpendicular to its axis relative to the hollow section 12. For this purpose, as described above, a cover 30 is fitted flush to the surface of the precast concrete member 18 so as to cover the mounting cavity 30. The covers can be held in different ways to the precast concrete part, for example by means of screws 40 which engage a welded to reinforcing bars 14 of the connecting element 10 nuts 54. In addition, the cover 38 has a Einfüllülle 50, through which the concrete is introduced clean so that the interior of the hollow section 12 and the mounting cavity 30 are completely filled.

By concreting the cavities of the prefabricated reinforced concrete element, a positive locking of the anchoring pin 22 is achieved perpendicular to its axis relative to the hollow section 12 and the reinforced concrete precast element 18. As a result, the scheduled and schlupfarme transmission of shear forces between reinforced concrete precast and building section 20 is possible. In addition, the concreting of the cavities for improved corrosion and fire protection of the steel components.

Claims (20)

1. Framework connecting element (10) which can be cast integrally in a prefabricated concrete part (18) and is suitable for connection of the prefabricated concrete part (18) to a building section (20) in a connecting direction in which tensile forces are transmitted and perpendicularly to which transverse forces can be transmitted, having at least one element (12) extending largely in the connecting direction and defining a chamber which extends in the connecting direction and is open in the connecting direction and open or closed at the sides, and by means of which the connection is formed directly, and on which at least one concrete reinforcing rod (14) is mounted stationarily, in particular welded.
2. Connecting element according to claim 1, characterised in that the element extending in the connecting direction is formed by a hollow profile (12) to which the concrete reinforcing rod or rods (14) are connected.
3. Connecting element according to claim 2, characterised in that the hollow profile (12) has a largely rectangular cross-section, concrete reinforcing rods (14) which if occasion arises are combined into two U-shaped pieces being provided at all four corners.
4. Connecting element according to claim 1, characterised in that the element (12') extending in the connecting direction has a substantially U-shaped cross-section.
5. Connecting element according to claim 1, characterised in that the element extending in the connecting direction is formed by two single elements (12'') each of L-shaped cross-section which are preferably combined into a rectangular hollow profile, concrete reinforcing rods (14) preferably being arranged in the region of the connection.
6. Connecting element according to any of claims 1 to 5, characterised in that the concrete reinforcing rod or rods (14) are arranged symmetrically to at least one axis, in particular the main axes of the element (12; 12'; 12") extending in the connecting direction.
7. Connecting element according to any of claims 1 to 5, characterised in that the concrete reinforcing rod or rods (14) are offset inwards relative to the outer circumference of the element extending in the connecting direction.
8. Connecting element according to one or more of the preceding claims in combination with an anchor bolt (22) and an anchor plate (28) which rests directly on the element (12; 12'; 12'') extending in the longitudinal direction.
9. Combination of several connecting elements according to any of claims 1 to 7 or of several combinations according to claim 8, which are connected to each other by one or more concrete reinforcing rod U-shaped pieces (34) which are mounted stationarily, in particular welded, on the elements (12; 12'; 12") extending in the longitudinal direction.
10. Combination according to claim 9, characterised in that the elements (12; 12'; 12") extending in the longitudinal direction are surrounded by the concrete reinforcing rod U-shaped pieces (34).
11. Prefabricated concrete part (18), in particular pillar, wall, ceiling or girder component, having at least one connecting element (10) according to any of claims 1 to 7 or having at least one combination according to any of claims 8 to 10.
12. Prefabricated concrete part (18) according to claim 11, characterised in that the chamber defined by the element (12; 12'; 12") extending in the connecting direction and/or an assembly cavity (30) provided in the environment of the connecting element (10) is filled with concrete.
13. Connecting element according to any of claims 1 to 7 or combination according to any of claims 8 to 12, in combination with a cover (38) which has a filling opening (50) for filling with concrete and can be attached to the connecting element (10) in such a way that a cavity (30) covered thereby can be filled with concrete.
14. Combination according to claim 13, characterised in that the filling opening (50) is designed as a filling spout or filling nozzle.
15. Combination according to claim 13 or 14, characterised in that the cover (38) has at least one adhesive strip or a spring clip (56).
16. Combination according to claim 13 or 14, in combination with at least one tape-like or strip-like element (58; 64) such as e.g. a cable tie (58), a wire or a metal strip (64), for attachment of the cover (38) to the connecting element.
17. Method for connecting a prefabricated concrete part (18) to a building section (20), which has the following steps:

    - integrally casting a framework connecting element (10) in the region of the butting face of a prefabricated concrete part (18);

    - placing the prefabricated concrete part with its butting face on the building section (20) in such a way that an anchor bolt (22) provided in the building section can be arranged so as to extend in the connecting direction in an element (12; 12'; 12") of the connecting element (10) which also extends in the connecting direction;

    - bracing the anchor bolt (22) to the element (12; 12'; 12'') extending in the longitudinal direction and to the building section (20) in the axial direction of the anchor bolt using an anchor plate (28);

    - fixing the anchor bolt (22) perpendicularly to its axis relative to the element (12; 12'; 12'') extending in the connecting direction.
18. Method according to claim 17, the anchor bolt (22) being fixed by filling with concrete a cavity defined in the prefabricated concrete part (18) by the element (12; 12'; 12") extending in the connecting direction and/or an assembly cavity (30) provided in the environment of the connecting element.
19. Method according to claim 17, the anchor bolt being fixed by retaining elements, preferably keys and/or adjusting screws.
20. Method according to claim 17, the prefabricated concrete part which is in particular like a tie being placed on top mainly in a direction perpendicularly to the longitudinal axis of the prefabricated concrete part.

Images