EP1424453B1 - coupling sleeve - Google Patents

Abstract

Connecting bushing (1) is formed as a profile material section piece. The connecting region is formed as a thread (4) on the inner wall of the bushing. An Independent claim is also included for a process for the production of a connecting bushing.

Description

The invention relates to a rebar connection with a connecting sleeve for the end-side connection to a reinforcing element of a concrete component, wherein the end of the reinforcing element protrudes into the connecting sleeve and the space between the connecting sleeve and the reinforcing element is filled with a casting agent.

Reinforcement connections with connecting sleeves are known in the art as Castings are formed. The manufacturing cost of such parts is relatively high.

In the German Offenlegungsschrift 29 06 752 discloses a method and apparatus for connecting a plurality of bar ends using a sleeve of cast steel, into which the bar ends are inserted from both sides. The space between rod and sleeve is filled with a curable resin material. Venting channels prevent the formation of voids or Luker when filling the resin. By keeping the space between the rod and sleeve as narrow as possible, the radial thickness of the resin is reduced and the formation of concentrated shear stress in the filler material is avoided.

In order to obtain a better connection between the resin material and the sleeve, annular recesses are provided in the interior of the sleeve, which are aligned with one another in such a way that they form clamping surfaces which give rise to a connection which can be loaded in particular on tension.

By means of radially adjusting screws, the rod end is aligned with respect to the sleeve. The formation of this sleeve of cast steel is very expensive, in particular the incorporation of the recesses is correspondingly complicated and complicated.

The German Offenlegungsschrift 1 559 509 discloses a sleeve for connecting the ends of two steel rods, wherein the inner surface of the sleeve provided with projections and depressions, which may have the shape of annular grooves. Bar ends and sleeve are potted with epoxy resin.

From the DE 695 24 377 T2 For example, a connection for reinforcing bars made from the section of a larger diameter reinforcing bar is known. This section will provided with a bore into which the ends of the rods to be joined are introduced and filled with adhesive. The surface of the hole is roughened.

From the German Offenlegungsschrift DE 31 45 924 A1 is a butt joint of reinforcing bars known. The rod ends of two reinforcing rods are inserted into a metal sleeve and the remaining cavity in the interior of the sleeve filled with cement mortar. At both ends of the cylindrical sleeve is closed by seals made of elastic material.

From the publication WO 02/36900 A1 or its corresponding US application US 2004/0018045 A1 , is a rebar connection known, the sleeve are provided at the ends with a slotted Abdichtkappe. This allows on the one hand the insertion of the reinforcing bar and seals it against the Vergüllmasse to be filled. A centering the reinforcing rod inside or in the middle of the coupling sleeve does not take place.

The invention has set itself the task of providing a Verbinungsmuffe as described above, which corrects the disadvantages described above.

This object is achieved by the features of claim 1.

Advantageous developments are described in the subclaims.

The proposal according to the invention turns away from the elaborate production of individual castings and proposes rather, for example, tubular rod material, for example, corresponding steel tubes to use, which are cut to length in the desired length and so the body of the Form connection sleeve. It is easily possible, by appropriate selection of profiled goods (steel quality, inner diameter, wall thickness), the coupling sleeve optimally adapted to the respective load purposes. In this case, the profiled goods is available as a mass-produced low, which is ultimately associated with low production costs of the coupling sleeve at the same time very high bandwidth of variants of the coupling sleeve for a variety of applications. Thus, the invention manages to actually combine two conflicting features. A high number of variants usually leads to correspondingly high costs in the provision of appropriate tools, molds and in the production of small series. The proposal according to the invention ensures a favorable production even with small series. In general, the profile material is obtained, for example, in a rolling or slide-drawing process. In particular drawn tubes of steel are characterized by small deviations and good surface finish. This manufacturing process also usually leads to an increase in strength, which is also advantageous for the field of application. Besides, it is of course possible to obtain profile material, for example, in a rolling process such as pipes or the like. If appropriate, extrusion-molding processes, of course depending on the particular material, can also be used. The main advantage of the invention lies precisely in the fact that this profile material is very cheap available in a variety of dimensions such as inner diameter, wall thickness or outer diameter and thus allows a high variety of types without having to hold a large number of different molds.

In the separated from the profile material, for example sawn, tapped or cut, profile material section piece is subsequently incorporated in a further processing step, a thread. The cutting of the thread is done fully automatically, for example, with appropriate machines, which keeps the costs low. At the same time, however, it is possible to roughen the inner surface of the profile material by the thread so that the zuzugießende, liquid casting compound, which has to transmit the forces between the reinforcing element and the connecting sleeve, actually einkrallt positive fit. It is not a mandatory requirement that the inner wall of the coupling sleeve carries a thread on its entire inner wall surface, this can be provided only in the connection region or in a part thereof, which then acts as a connection region.

The proposal according to the invention combines favorable manufacturing costs with a high degree of variability in the design of the connecting sleeve according to the invention and represents a very reliable technique for connecting the reinforcing element with the connection sleeve available.

In this case, the invention is not limited to the coupling sleeve as described, but also includes a method for producing such a coupling sleeve, initially separated by a profile material a Profilmaterialabschnittstück, for example sawed off, tapped or cut and then in the inner wall of an interior of the Profile material section piece a thread is cut. The profile material section piece is obtained from a profile material by cutting off, cutting or sawing, in particular, the cutting or parting off with appropriate tools is done very quickly and inexpensively.

In a preferred embodiment of the invention, it is provided that the reinforcing element carries ribs and the ratio of threads to ribs in the region of the reinforcing element projecting into the connecting sleeve is 2.5 to 5, preferably 2.9 to 4.2. It is advantageous if not only a frictional, but a possible positive connection between the coupling sleeve and the reinforcing element, for example, the reinforcing steel exists. For this purpose, ribs are provided on the reinforcing element or the reinforcing steel, through which results in a positive connection in the casting agent or the concrete (depending on the application). It has been found that a relatively higher number of threads, so grooves in the inner wall, significantly improve the bond between the reinforcing element and the sleeve. Due to the relatively larger number of threads, a plurality of obliquely oriented contact surfaces for the encapsulant are created, without thereby widening the gap between the coupling sleeve and the reinforcing element too much. It has been found that the best adhesive effect is achieved if the thickness of the casting agent is as low as possible in order to achieve a "contact bonding". as is known, for example, with synthetic adhesives. Particularly at a ratio of threads to ribs between 2.5 and 5, particularly preferably between 2.9 and 4.2 very good results have been achieved. A ratio of about 2.9 corresponds in one embodiment to a reinforcing steel diameter of 8 mm, a ratio of 4.2 to a reinforcing steel diameter of 28 mm. Of course, it is possible to achieve a higher ratio even with thinner rods, for example, by using appropriate fine thread.

Another preferred embodiment of the invention provides that the depth of the threads is less than the radial, in particular the mean width of the intermediate space. The gap is the sleeve-like body forming between the coupling sleeve and the reinforcing element. Ideally, the reinforcing element or reinforcing steel is inserted concentrically into the sleeve-like or cylindrical coupling sleeves. It would then give a "sleeve" of the gap with a constant thickness. This is understood below as the mean radial width of the intermediate space. Such an arrangement is sought, in particular by the centering devices explained below, in order to achieve the most uniform possible introduction of force of the reinforcing element via the casting agent in the connecting sleeve.

In this context, it has also been found that on the one hand, a certain roughness on the inner connecting sleeve wall is advantageous, but the radial width of the intermediate space may not be too large, in order not to elastic or even plastic deformation of the casting agent at a load reach. Based on this finding, on the one hand, a relatively large number of threads, as indicated, per ribs provided, they in other ways also in the specified geometry (thread depth less than gap width) expresses and thus results in a stable as possible reliable and permanent connection between the coupling sleeve and the reinforcing element.

Depending on the dimensions of the coupling sleeve and the reinforcing element to be inserted or the reinforcing steel, it has been found that the average radial width of the intermediate space is between 1 and 6 mm, preferably between 2 and 4.5 mm. The mean radial width may also correspond to the play of the arrangement of the reinforcing element in the connecting sleeve. A certain amount of play is advantageous for introducing the reinforcing element into the connecting sleeve, relatively large widths of the intermediate space (of the clearance) also being used for relatively thick reinforcing elements. Reinforced steels between 8 and 28, sometimes 32, 36 or even 40 mm in diameter are used. However, the invention is not limited thereto.

The connecting sleeve according to the invention is characterized in particular by the fact that a lasting slip between the connecting sleeve and the reinforcing element connected to the casting agent of less than 0.1 mm is formed under working load. Such an arrangement is achieved in particular by optimizing the cooperation of the reinforcing element, the casting agent and the connecting sleeve. In particular, this is achieved in that the geometry is chosen such that the radial width of the gap is as small as possible.

It has in this case in particular shown that the coupling sleeve with the encapsulant, in particular resin or epoxy resin, embedded, designed as reinforcing steel reinforcing element has the same fatigue strength, as the unpunched reinforcing steel. In particular, the use of reactive resin adhesives As a grout, the fatigue strength has increased considerably, at the same time there was a slight slip over the entire compound under working load of not more than 0.1 mm. The chosen arrangement achieves further, surprising advantages. In addition to the above-described favorable production with a wide variability, a vibration-resistant, and only a slight slip-forming compound according to the invention is provided.

Moreover, it has been found in a further variant of the invention that the anchoring depth of the protruding into the coupling sleeve reinforcement element or reinforcing steel at least 5 times the diameter of the reinforcing element or the reinforcing steel diameter corresponds. Better results have been achieved when the anchoring depth is at least 5 to 10 times, especially within the interval of 6.5 to 9 times the diameter of the reinforcing element / reinforcing steel diameter. This improvement leads to an optimized transmission of forces in the coupling sleeve. The specified relationships ensure that the service loads are transmitted safely and at the same time the connection sleeve is not built so large, which would lead to relatively high weight and higher production costs. On the other hand, it has been recognized that with smaller rod diameters, the anchoring depth is somewhat larger than with larger rod diameters, with a rod diameter of about 8 to 16 mm was advantageously found that at least a factor of 8 between the anchoring depth and the rod diameter, whereas with reinforcing steels between 20 and 32, 36 or 40 mm in diameter, a factor of at least 7 between the anchoring depth and the diameter may already be sufficient.

The use of an internal thread also offers several other advantages. On the one hand, it is possible that the thread to Screwing a bolt or the like with matching external thread is used. Furthermore, the internal thread but also serves to improve the power transmission between the reinforcing element (for example, a reinforcing steel or reinforcing rod) on the adhesive mortar on the coupling sleeve. The use of the thread is therefore twice as cheap. The proposal according to the invention limits the coupling sleeve not only to a connection with another element with the aid of adhesive mortar, but also allows the screwing of a bolt with a corresponding external thread. It is therefore also possible to connect different systems of reinforcing elements with the aid of a connecting sleeve which nevertheless functions as an interface.

According to the invention in this application is generally spoken of casting agent for filling the gap. For the purposes of the invention, a grout is equivalent to the grout. As grout next adhesive mortars (possibly based on cement) and resins, epoxy resins or reactive resin adhesive can be used, which set for a fast setting, after a short time are resilient and able to transfer a high working load.

It is also advantageous if at least the connecting sleeve end carries an internal thread. It has been found that even with such a configuration, a sufficient power transmission from the reinforcing element (or reinforcing bar) is achieved on the coupling sleeve. The cost of cutting the thread can therefore be reduced accordingly, but without sacrificing the advantage of the connection option, especially in the end of the coupling sleeve. In addition to the possibility of screwing a bolt or the like in the connecting sleeve, it is of course also possible assembly plate, possibly made of plastic, screwing into the thread. The plastic needs no precut Have thread, the softer plastic material gives accordingly.

It is inventively provided to use both thread with small and large threads.

Alternatively, it is of course also possible that the internal thread extends over the entire length of the connecting sleeve.

The invention is not limited to the pure connection of reinforcing elements, which are to be connected according to their impact. It is in principle also possible to dimension the coupling sleeve so that it receives a plurality of reinforcing elements.

It is possible that on the one hand only one, possibly thicker in its cross-section reinforcing element is inserted and on the other side two or more, lead out correspondingly thinner reinforcing elements.

Furthermore, it is provided that the connecting sleeve is formed with the substantially constant cross-section. In order to avoid that the adhesive mortar, which flows into the gap between the reinforcing element and the connecting sleeve, flows out of the connecting sleeve in the end region, corresponding seals can be provided. Such a configuration allows that a corresponding, secured measure of the internal thread is available for connection purposes.

If this is not essential, it is alternatively also possible that the connecting sleeve is constricted end such that the reinforcing element is still insertable. At this variant according to the invention meet some advantageous possibilities together. Firstly, the constriction can be just dimensioned so that when the reinforcing rod is inserted into the reinforcing element, the remaining gap is so small that no adhesive mortar flows out. Furthermore, this constriction can conveniently serve as a centering device for the reinforcing bar to ensure that the reinforcing bar is arranged as concentric as possible for optimum power transmission between the reinforcing element and the coupling sleeve.

The constriction is won in a simple manner. This is possible, for example, by a corresponding pressing or pressing of the end region of the connecting sleeve. In order to achieve a high force transmission between the reinforcing element and the connecting sleeve, the internal thread can be cut in before or after the pressing. It is even possible, even the internal thread in the constriction, for example, for the placement of a plastic mounting plate or the like to use. But it is also easily possible just to cut the end of the connecting sleeve, if correspondingly accurate internal thread, for example, for screwing a bolt and so on, are needed. The area of the constriction also helps in the statics, since the occurring shear forces may also be supported on the constriction area. With a corresponding dimensioning result from this higher load capacity, or the thread can turn out to load application shorter or eliminated.

Conveniently, the coupling sleeve has different openings. For example, one or more filling openings are provided for the adhesive mortar into which the adhesive mortar is inserted when the reinforcing bars or reinforcing bars are positioned in the connecting sleeve accordingly are. Preferably, the adhesive mortar is pressed with pressure. It is the goal that the adhesive mortar propagates as possible without formation of hollow chambers and so on in the gap between the reinforcing element and coupling sleeve. To aid this, one or more vents are provided in the coupling sleeve.

Preferably, the filling opening is located in the middle or in the middle region of the connecting sleeve, in order to achieve the most symmetrical possible spreading of the adhesive mortar in the sleeve. The ventilation openings are preferably located in the end region of the connecting sleeve.

In order to avoid that ends of the coupling sleeve adhesive mortar flows out, a seal can be provided at the connecting sleeve end. There are different variants for this.

On the one hand, it is possible to provide a sealing ring or a sealing cord as a seal. The sealing ring is, for example, pushed onto the end of the reinforcing element designed as a reinforcing bar and clamped on it. Alternatively, it is also possible to insert a sealing cord in the gap between the reinforcing rod and coupling sleeve. In this variant, the seal is arranged in the coupling sleeve and conceals the gap between the coupling sleeve and the reinforcing element.

Alternatively, it is also possible to provide a sealing cap as a seal, wherein the sealing cap is clamped on the connecting sleeves.

For a secure connection of the sealing cap on the coupling sleeve, it is also possible that the coupling sleeve end has on its outer side a corresponding thread or an undercut, which / s with the sealing cap in a corresponding manner (thread or protruding nose) holding It is also advantageous to optionally form the seal from a plurality of elements which together provide a complete seal. Especially with relatively poorly accessible connections, this is an interesting option.

The sealing ring can also serve to center the reinforcing bar in the sleeve, which improves the quality of the force and thus the load capacity.

As already described above, it is also provided that the end-side constriction (or compression) of the connecting sleeve acts as a seal. The end-side constriction reduces the gap between the coupling sleeve and the reinforcing element, which can be dimensioned so that the remaining gap, which still exists for the insertion of the reinforcing element, is so small that no appreciable Klebörtörtelmaterial flows out. If a correspondingly fast-setting adhesive mortar is used, it will close this gap by itself. Optionally, it is also possible to stick a slightly yielding tape or tape in the interior of the constriction, which is compressed accordingly upon insertion of the reinforcing element, but closes the remaining gap safely.

Conveniently, it is provided that the seal cooperates with the internal thread of the coupling sleeve to obtain a secure arrangement of the seal in the region of interest. The design of the seal also allows that it is designed as a mounting plate, whereby the assembly, for example, within the formwork when creating the concrete component, is facilitated. Again, the seal is used twice, because in addition to the actual function to seal the gap, this serves as a mounting plate and facilitates installation. According to the invention, in the connecting sleeves, preferably in the middle region, a limiting piece arranged. The limiting piece serves to place the connecting sleeve as centrally as possible over the two intermittently arranged reinforcing elements. It therefore limits the possibility of how far a reinforcing element end dips into the sleeve. Conveniently, the limiting piece is arranged centrally, but without limiting it thereto. It is also possible to choose corresponding asymmetrical arrangements of the limiting piece. In this case, if a constriction is arranged on the end side of the connecting sleeve, it is provided to install the limiting piece before the compression of the connecting sleeve end.

To ensure that the reinforcing element to be installed sits as concentrically as possible in the connecting sleeve, a centering device for the reinforcing element is provided. This achieves the most symmetrical possible transfer of the forces to be transferred from the reinforcing bar into the connecting sleeve. Also for the design of the centering exist several possibilities. First, it is proposed that several, preferably three, are provided on the circumference of the connecting sleeve equidistantly arranged clamping screws. The clamping screws allow a flexible adaptation to the respective diameter of the reinforcing element.

Alternatively, it is provided in a further variant of the invention that serve as a centering several, preferably three, circumferentially equidistantly arranged resilient pin made of plastic. The pins are so resilient that they are pressed in a corresponding opening in the coupling sleeve, but there are stable in position to achieve a secure centering. The advantage of this variant is that can be dispensed with the cutting of a thread in the coupling sleeve. Alternatively, it is of course possible to provide the thread and the plastic to move so that it gives way in the thread and cuts the thread in the plastic.

According to the invention, the limiting piece has a center for receiving the reinforcement element and thus serves as a centering device. For example, the limiting piece has a conical or frusto-conical recess, which also allows a continuous adjustment to different diameter of the reinforcing element. Furthermore, it is provided that the seal or the constriction as centering mitdient. This ensures that the sleeve along two areas, namely in the middle and in the end region, concentric with the coupling sleeve is orientable. In particular, the arrangement of the constriction, as already described, results in additional synergetic effects.

In a preferred embodiment of the invention it is provided that an adhesive mortar is provided as a grout. As far as in the context of this application of adhesive mortar has been spoken, this is of course in the same way here, for example, based on cement-based grout to see. Adhesive mortar hereby consist of a mixture of cements, various plastics and other additives. For example, special synthetic resin dispersion powder, etc. are added to the adhesive mortars. The grout or the adhesive mortar should thereby advantageously have the following properties. He should have a high compressive strength at the same time good flowability. Due to good fluidity, a full-scale compression of the connecting sleeve interior is achieved. Favorable is a high early strength to reach a certain partial load of the coupling sleeve shortly after casting.

Fig. 1, 2

in einer Schnittdarstellung verschiedene Varianten einer Verbindungsmuffe;

Fig. 3, 4, 5, 6, 7

in einer Schnittdarstellung verschiedene Details von Verbindungsmuffen;

Fig. 8a, 8b, 8c

in einer Schnittdarstellung (Fig. 8a), ein vergrößertes Detail (Fig. 8b) und in einer Draufsicht (Fig. 8c) weitere Details von Verbindungsmuffen;

Fig. 9a, 9b, 9c

in einer Schnittdarstellung (Fig. 9a) eine Variante der Erfindung, in Fig. 9b Draufsicht auf ein Detail der Erfindung, Fig. 9c ein vertikaler Schnitt durch das Element nach Fig. 9b;

Fig. 10a, 10b

die Zentriervorrichtung einer Verbindungsmuffe in einer Schnittdarstellung (Fig. 10a) und in einer Draufsicht nach Fig. 10b;

Fig. 11, 12

je eine Verbindungsmuffe in einer Schnittdarstellung;

Fig. 13

das Befüllen einer Verbindungsmuffe;

Fig. 14

das Befüllen der erfindungsgemäßen Verbindungsmuffe mit Klebemörtel ;

Fig. 15

eine in ein Betonbauteil eingebaute Verbindungsmuffe.

In the drawing, the invention is in the Figures 9 and 14 shown schematically. Show it:

Fig. 1, 2

in a sectional view different variants of a coupling sleeve;

3, 4, 5, 6, 7

in a sectional view, various details of coupling sleeves;

Fig. 8a, 8b, 8c

in a sectional view ( Fig. 8a ), an enlarged detail ( Fig. 8b ) and in a plan view ( FIG. 8c ) further details of connecting sleeves;

Fig. 9a, 9b, 9c

in a sectional view ( Fig. 9a ) a variant of the invention, in Fig. 9b Top view of a detail of the invention, Fig. 9c a vertical section through the element Fig. 9b ;

Fig. 10a, 10b

the centering device of a connecting sleeve in a sectional view ( Fig. 10a ) and in a plan view Fig. 10b ;

Fig. 11, 12th

each a connecting sleeve in a sectional view;

Fig. 13

the filling of a connecting sleeve;

Fig. 14

the filling of the connecting sleeve according to the invention with adhesive mortar;

Fig. 15

a built-in a concrete component coupling sleeve.

Fig. 1 shows a coupling sleeve 1. The coupling sleeve is placed on the end of a reinforcing element 2, for example a reinforcing bar 20, 21 and connects the two reinforcing bars 20, 21 end. For this purpose, the space left between the reinforcement element 2 and the connecting sleeve 1 is potted with adhesive mortar 5. For this purpose, the connecting sleeve has a filling opening 12, which in This embodiment is arranged substantially in the middle of the connecting sleeve 1.

At least the edge or end region 11 of the connecting sleeve 1 has an internal thread 4. The internal thread 4 serves essentially two purposes. On the one hand, this increases the bond between the adhesive mortar and the connecting sleeve, that is, increases the transferable force between the reinforcing element 2 and the connecting sleeve 1.

In the in Fig. 1 shown example, the thread 4 is only in the end portion 11 of the coupling sleeve 1. The middle region has no thread. Alternatively, it is provided that the thread 4 extends over the entire length of the inner side 10 of the connecting sleeve 1.

In Fig. 2 an interesting variant is shown. Instead of the composite of two reinforcing bars 20, 21, as in Fig. 1 , is in the Fig. 2 at the left end of the connecting sleeve 1, a bolt 3 is turned on the thread 4. On the threaded bolt 3 then optionally similarly configured connecting sleeves 1 can be turned on to give a corresponding further connection to other reinforcing elements. In the embodiment shown here, the filling opening 12 is off-center, here in the left area of the connecting sleeve. The pressed into the gap adhesive mortar swells out of the end gap 14 between the sleeve 1 and the reinforcing element 2 when the gap is filled, out.

In Fig. 3 the use of the connecting sleeve 1 is shown. Two reinforcing bars 20, 21 to be connected butt to joint are to be connected to the connecting sleeve 1. The left reinforcing bar 21 is already inserted into the left part of the coupling sleeve, the gap between the Reinforcing bar and the connecting sleeve 1 is closed by a seal 6. The right rod 20 is being inserted, this is indicated by the arrow. This reinforcing rod 20 carries a sealing ring 60 as a seal 6. This sits firmly on the reinforcing bar 2 for securing and sealing.

If the two reinforcement elements 2 designed as reinforcing rods 20, 21 are inserted into the connecting sleeve 1, then the respective seals 6 seal the gap or the gap between the reinforcing element 2 and the connecting sleeve 1. It is then filled through the filling opening 12 Klebemörtel 5. To escape the air vents 13 in the coupling sleeve (in this case at the end) or in the seals 6 are provided. The seal 6 is in this case squeezed during installation so that a secure seal is formed. As can still flow through the vent opening 13 in the connecting sleeve 1 existing air, a possible bubble or shot free casting with adhesive mortar 5 is achieved.

In Fig. 5, 6 is shown a further, particularly interesting embodiment of a coupling sleeve. The structure in particular of the connecting sleeve 1 after Fig. 5 is after Fig. 1 similar. In addition, a constriction 15 is provided at the lateral edge of the connecting sleeve 1, which is achieved by a compression. This constriction 15 causes more at the same time. On the one hand, the constriction 15 also acts as a seal 6, that is, it prevents adhesive mortar 5 from running out of the interior of the connecting sleeve 1. The remaining gap serves as a vent.

At the same time, this constriction 15 also acts to reliably transmit the forces to be transmitted from the reinforcement element 2 to the connection sleeve 1. In addition, it is possible if the compression or constriction 15 accordingly is selected narrow clamp the coupling sleeve 1 for mounting purposes on the reinforcing element 2 accordingly. In addition, this constriction 15 also acts as a centering device 7 to ensure that the reinforcing element 2 is installed as concentrically as possible in the connecting sleeve 1.

The invention allows the realization with a thread 4 (see Fig. 9 and 14 ).

In Fig. 7 It is shown that the constriction 15 is formed so tight that no gap between the sleeve 1 and the reinforcing bar 2 remains from which potting material could swell, as in the variant according to Fig. 5 indicated and optionally also acceptable. In addition, for example, it is also provided to provide an elastic sealing band or the like in the region of the constriction 15, which allows the insertion of the reinforcing element 2, but prevents the outflow of adhesive mortar 5.

In the Fig. 8a, 8b and 8c another variant is shown. As a seal 6 in this case serves a Abdichtkappe 61, which has an opening for performing the reinforcing element 2. This is for example in Fig. 8c shown, wherein the existing of fins 62 Abdichtkappe crosswise slotted 63, resulting in a corresponding elasticity and a continuous adjustment of the opening to the respective diameter of the reinforcing rod. 2

The sealing cap 61 is placed or clamped on the end-side edge of the connecting sleeve 1 so that it securely closes the connecting sleeve end and prevents adhesive mortar 5 runs out. The opening in the sealing cap 61 centers the reinforcing bar in the sleeve longitudinal axis.

In the detail after Fig. 8b is clearly visible as the adhesive mortar 5 extends into the intermediate space between the reinforcing bar 2 or reinforcing element 2 and the connecting sleeve 1. The connecting sleeve 1 also has a thread 4 in the end region, wherein the adhesive mortar 5 flows into both the threads of the thread 4 as well as in the interstices between the ribs of the reinforcing bar 20 and so not only produces a positive but also a positive connection.

In Fig. 9a a variant of the invention is shown. The seal 6 is in this case designed as a mounting plate 64, which, like the cap 61, is placed on the end of the connecting sleeve 1 or pressed. For improved bonding of the mounting plate 64 on the reinforcing element 2 of the mounting plate 64 has a concentric bore with internal thread 65. The internal thread 65 facilitates jamming of the mounting plate 64 on the possibly also equipped with ribs reinforcing rod or other reinforcement element. 2

At the same time, of course, this mounting plate 64 also acts as a centering 7. Conveniently, the mounting plate 64 has a small bore 66, which also serves as a vent hole.

Furthermore, in the in Fig. 9a shown embodiment, a limiting piece 8 inserted into the interior of the connecting sleeve 1. This also acts as a centering device 7 for the reinforcing element 2. For this purpose, the centering device 7 has a conical receptacle 70 which is concentric in the connecting sleeve 1. Now, if the reinforcing element 2 is introduced, it will slide into a further insertion movement into the receptacle 70 and so automatically aligned centered at least at its front end. In the area in which the reinforcing element 2 leaves the coupling sleeve 1, the seal 6 helps with concentric alignment, in which respect the seal 6, be it the sealing ring 60, the sealing cap 61, the mounting plate 64 or the constriction 15, as Part of the centering 7 mitdient. As a result, it is thus achieved that in the section in which the reinforcing element 2 dips into the connecting sleeve 1, this is oriented as concentrically as possible in order to achieve a uniform force transfer between the reinforcing element 2 and the connecting sleeve 1 via the cast-adhesive mortar 5.

In Fig. 10a, 10b a further variant of the centering device 7 is shown. Here, several, preferably three, on the circumference of the connecting sleeve 1 equidistantly arranged clamping screws 71 are proposed. These screws can also be arranged offset. There are two times three screws arranged so as to achieve as concentric alignment of the reinforcing element 2 as possible. In the variant after Fig. 10a is dispensed with a seal 6, wherein here also the seal 6, as described, can serve as a centering device 7.

In Fig. 11 another variant is shown. In the interior of the connecting sleeve 1 in this case a limiting piece 8 is provided, which is designed as a sealing plug 80 such that it closes the essential part of the cross section of the inner diameter of the connecting sleeve. Such an arrangement is particularly advantageous if it is to be ensured that no adhesive mortar 5 is intended to run in on the left-hand side in order, for example, to keep this threaded area clean for the insertion of corresponding bolts and so on. Optionally, it also has the limiting piece 8 has a corresponding external thread, whereby the stopper 80 and the limiting piece. 8 exactly positioned and the threads are securely sealed.

This in Fig. 11 Example shown is then for example in Fig. 15 built-in. Instead of a stopper 80 shows Fig. 12 a splint 81 as a limiting piece 8, which is pressed through a hole in the middle of the connecting sleeve 1 and also reaches a corresponding position limitation of the reinforcing elements 2.

As far as is spoken in this application of reinforcing bars, this does not limit the invention to this particular embodiment. In the same way, reinforcing bars should also be understood to mean reinforcing elements here. As a grout also adhesive mortar or the like is used.

In Fig. 13 Another interesting variant is shown. Usually, the adhesive mortar is held by a cartridge 9 and filled via a nozzle 90 in the connecting sleeve 1. Here, the nozzle 90 is inserted into the filling opening 12 and then filled, for example under pressure of the adhesive mortar 5. It is provided, for example, that a predetermined breaking point 92 is arranged on the nozzle 90 in the front region, that is to say on the nozzle tip 91, whereby it is possible to break off the nozzle tip 91 and remove the front part as a limiting piece 8, for example as a splint 81. to use.

In Fig. 14 a further variant of the invention is shown. In this case, a web 16 is provided as a limiting piece 8 in the connecting sleeve 1. This web is, for example, subsequently incorporated in the coupling sleeve 1, for example welded or hammered. It is easy to see how the connecting sleeve 1 is completely installed in a concrete component 29. This can be an in-situ concrete or precast concrete component. The internal reinforcing bar 20 ends in the right part of the connecting sleeve 1. In the left part of the connecting sleeve 1, the left reinforcing bar 21 connects, which serves for example for the connection of another concrete component. For the subsequent filling of the adhesive mortar 5, for example, a bent hose is provided at the filling opening 12, by which it is possible to bring adhesive mortar 5 into the connecting sleeve 1, even over a certain distance from the outside, through the precast concrete element.

The mounting plate 64 served not only as a seal, but in this embodiment also as an assembly aid, namely, when the connection sleeve 1 is to be attached to the shells of the concrete component at this. This then results in the shape of the mounting plate 64 corresponding recess 28 after stripping. As shown here, the mounting plate 64 has been dismantled only after the adhesive mortar 5 has gone in and hardened. Of course, the mounting plate 64 also serves as a seal.

In Fig. 15 is yet another variant shown. Similar to in Fig. 11 the connection sleeve 1 has been used with the help of the mounting plate 64 (shown here still attached to the coupling sleeve) in the manufacture of the concrete component. In this case, a cavity 30 is protected by the mounting plate 64 from the ingress of concrete. For this purpose, the mounting plate 64 may be completely closed. In this embodiment, the filling opening 12 is not centered, but arranged strongly off-center. It remains on the left a shorter area in which, for example, on the thread 4, a corresponding bolt 3 is aufdrehbar. This solution therefore makes it possible, for example via a corresponding pin 3 with external thread to connect a second coupling sleeve. This is for example in the section concreting advantageous, wherein the load of the first reinforcing element or Reinforcement bar is transferred to the adhesive joint mortar on a first coupling sleeve and the connecting sleeve transmits this force on the connecting bolt, which in turn is also screwed into a second coupling sleeve and there likewise gives the forces on the next reinforcing rod via an adhesive mortar. It should be noted that this configuration is not dependent on the intended use of the connecting sleeve 1 Fig. 1 in which, for example, two reinforcing elements are to be joined together butt-to-joint. This very simple embodiment of the coupling sleeve allows a large treasure of applications.

The claims now filed with the application and later are attempts to formulate without prejudice to the attainment of further protection.

If, on closer examination, in particular also of the relevant prior art, it appears that one or the other feature is beneficial for the purpose of the invention, but not of decisive importance, it is of course already desired to formulate such a feature , in particular in the main claim, no longer having.

The references cited in the dependent claims indicate the further development of the subject matter of the main claim by the features of the respective subclaim. However, these are not to be understood as a waiver of obtaining independent, objective protection for the features of the dependent claims.
Features that have hitherto been disclosed only in the description can be claimed in the course of the method as of essential importance to the invention, for example to delineate the prior art.

Claims (17)

1. Reinforcement connection with a connecting sleeve and at least one reinforcement element for connecting at the end side to the reinforcement element of a concrete component, in particular for connecting two reinforcement elements, the end of the reinforcement element projecting in the connecting sleeve and the space between the connecting sleeve and the reinforcement element being filled with a casting agent, the connecting sleeve being designed as profile material section part, a first centering device being provided at the edge of the end side of the connecting sleeve for the reinforcement element with respect to the connecting sleeve, and a boundary part (8) being provided in the connecting sleeve limiting the penetrating of the reinforcement element in the connecting sleeve, characterised in that the connecting area at the interior wall of the connecting sleeve (1) is designed as a thread (4), the boundary part (8) having in the middle a receiver (70) for the reinforcement element (2) and thus also serves as a second centering device (7).
2. Reinforcement connection according to claim 1,
   characterised in that as first centering device (7) several, preferably three attachment screws (71) arranged equidistantly at the circumference of the connecting sleeve (1), if necessary even staggered are provided, and/or as first centering device (7) several, preferably three arranged equidistantly at the circumference, non-positive pegs (71) of synthetic material act.
3. Reinforcement connection according to one of the preceding claims, characterised in that the first centering device (7) is provided in the shape of a sealing cap (61) or an assembly plate (64), and/or a seal (6) or a contraction (15) serves also as first centering device (7).
4. Reinforcement connection according to one of the preceding claims, characterised in that a seal (6) is provided at the end of the connecting sleeve (11), the seal being designed preferably as conical nipple (60) or sealing profile, and/or the boundary part (8) being arranged in the middle area in the connecting sleeve (1).
5. Reinforcement connection according to one of the preceding claims, characterised in that a seal (6) is arranged in the connecting sleeve (1) and covers the gap (14) located between the connecting sleeve (1) and the reinforcement element (2), and/or a contraction (15) at the end side of the connecting sleeve (1) acts as seal, and/or a seal (6) centers the reinforcement element (2), and/or a seal (6) interacts in a holding way with the interior thread (4) of the connecting sleeve (1), and/or a seal (6) sits clamping on the reinforcement element (2).
6. Reinforcement connection according to one of the preceding claims, characterised in that as casting agent adhesive mortar based on cement or epoxy resin is provided, and/or the reinforcement element (2) has ribs, and the ratio of threads to ribs in the area penetrating in the connecting sleeve (1) of the reinforcement element (2) is 2.5 to 5, preferably 2.9 to 4.2, and/or the depth of the threads is less than the in particular average radial width of the space.
7. Reinforcement connection according to one of the preceding claims, characterised in that the average radial width of the space is between 1 and 6 mm, preferably between 2 and 6 mm, and/or under working load a remaining slip forms between the connecting sleeve (1) and the reinforcement element (2) connected with the casting agent of less than 0.1 mm.
8. Reinforcement connection according to one of the preceding claims, characterised in that the connecting sleeve with the reinforcement element imbedded in casting agent, in particular resin or epoxy resin designed as concrete steel has the same fatigue resistance as the unpounded reinforcement element.
9. Reinforcement connection according to one of the preceding claims, characterised in that the anchorage depth of the reinforcement element or the concrete steel penetrating in the connecting sleeve corresponds at least five times, in particular five to ten times, preferably 6.5 to 9 times to the diameter of the reinforcement element or the diameter of the concrete steel.
10. Reinforcement connection according to one of the preceding claims, characterised in that the thread (4) serves, on the one hand, for screwing in bolts (3) or the like with suitable exterior thread, and, on the other hand, the thread (4) serves for improving the transmission of power from reinforcement element (2) via the casting agent (5) to the connecting sleeve (1).
11. Reinforcement connection according to one of the preceding claims, characterised in that the connecting sleeve (1) is designed in the direction of the longitudinal axis of the sleeve with an essentially constant cross section, and/or the connecting sleeve (1) is at the end side contracted (15) in such a way that the reinforcement element (2) can still be introduced and also in the area of the contraction (15) a thread (4) is provided.
12. Reinforcement connection according to one of the preceding claims, characterised in that the connecting sleeve (1) has one or more feed openings (12) for the casting agent (5), and preferably the feed opening (12) is in the center or the center area of the connecting sleeve (1), and/or the connecting sleeve (1) has one or more ventiducts (13).
13. Reinforcement connection according to one of the preceding claims, characterised in that the sealing cap (61) has an opening for leading through the reinforcement elements (2), and/or the seal (6), in particular the sealing cap (61) is designed in several pieces, and/or the sealing cap (61) has several flexible lamellas (62).
14. Reinforcement connection according to one of the preceding claims, characterised in that the seal (6), the assembly plate (64) or the sealing cap (61) have a ventiduct.
15. Reinforcement connection according to one of the preceding claims, characterised in that the assembly plate (64) serves for placing the connecting sleeve (1) in the encasing during the manufacturing of the concrete part (29), and/or the assembly plate (64) is closed and prevents concrete from getting in the interior of the sleeve.
16. Reinforcement connection according to one of the preceding claims, characterised in that a hose is connected to an opening (12) of the connecting sleeve (1) through which the casting agent (5) can be fed in the connecting sleeve (1).
17. Method for producing a reinforcement connection according to one of the claims mentioned before, characterised in that first of all a profile material section part is separated, for example sawed off, sliced off or cut off, from profile material, and then in the interior wall of an interior space of the profile material section part a thread is cut in, the connecting sleeve is put on the reinforcement element/s, and then the space between reinforcement element and connecting sleeve is filled with casting mortar or adhesive mortar.

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