EP3009575B1 - Connecting device for mechanically coupling concrete slabs, and concrete wall constructed with same - Google Patents

Description

The invention relates to a connecting device for the mechanical coupling of concrete slabs, as well as formed with such a connecting devices and concrete slabs concrete wall, as stated in the claims 1 and 13.

From the prior art, a variety of connecting devices for connecting concrete elements are known. The product range extends from simple anchor and expansion head screws to comparatively complex support shoes and support brackets, which often also represent an individual custom-made to meet the required static properties can. In particular, simple anchor bolts whose expansion head is intended for anchoring in a borehole are inadequate for many applications, after their tear propagation resistance in the concrete element is only partially satisfactory. Remedy here can create the various special constructions, which, however, each have to be made individually and therefore costly.

In the DE 103 12 701 A1 Measures have been proposed to improve the pull-out strength of a cast in a concrete foundation anchor bolt. In particular, additional head bolts are provided in the vicinity of a cast-in head of the anchor bolt and also cast in the foundation, so as to avoid a conical breaking of the concrete of the foundation around the head of the anchor bolt around. The corresponding embodiment is only practical for connecting wall elements or columns with a foundation or a bottom plate.

The WO 2010/048647 A1 , which goes back to the applicant, describes a filter device, in particular a filter housing whose walls are composed of individual concrete slabs. For mechanical coupling of the individual, juxtaposed concrete slabs connecting elements in the form of screw, clamp or form-fitting connections have been proposed. Alternatively, it was proposed to provide double-shell concrete double walls, the interstices of which must be filled with fluid concrete in order to build up the mutual connection between the individual concrete elements. It was also proposed in To provide the narrow surfaces of juxtaposed concrete elements each groove-shaped recesses, which are to be completed in the course of the construction of the respective concrete walls with a relatively small amount of fluid concrete. In addition, it has been proposed to provide iron plates which are flush-mounted in the concrete slabs in order to weld functional components, such as frame or support elements of a filtering module, or screw. However, the correspondingly proposed measures are only conditionally satisfactory with regard to the shortest possible assembly or erection times. US 4,781,006 discloses a connection device according to the preamble of claim 1.

The present invention has for its object to provide an improved connection device for concrete slabs, which makes it possible to build a concrete wall composed of several concrete slabs with sufficiently high accuracy in the shortest possible time.

This object of the invention is achieved by a connecting device with the features according to claim 1, and by a concrete wall according to the features of claim 13.

An adjusting by the technical measures according to claim 1 advantage is that such a connection device allows a highly stable connection between prefabricated, contiguous to each other concrete slabs, in particular between individual prefabricated concrete slabs. This is achieved inter alia by the fact that the two mutually corresponding coupling devices of the connecting device are already cast into the concrete slabs to be joined and thus represent an integral, firmly anchored component of the concrete slabs to be joined together. In particular, it can be achieved by sufficiently dimensioned reinforcement and anchoring elements on the mutually corresponding coupling elements, for example in the form of projecting rods, plates or claws, in a simple manner high Ausreißfestigkeiten against the concrete of the concrete slabs. In addition, the mechanical connection between the coupling devices - and thus between the corresponding concrete slabs - can be built in a relatively short time, which favors the economics of the system. In particular, the required time periods for crane work can be kept as low as possible. In addition, with the exception of relatively simple screwing tools are no expensive Installation aids, such as welding equipment or means of transport for flow or delivery concrete required to produce a stable mechanical connection between the individual concrete slabs. Especially with concrete slabs or concrete walls to be manufactured with a height of more than 3 meters, this represents a significant advantage after the installation of high scaffolding can often be eliminated and due to the relatively short manipulation times to build an immediately stable, mechanical connection with Mobile lifts or simple work platforms, the Auslangen can be found.

A major advantage of the invention is also that the usual component and positioning tolerances of concrete slabs to be joined together are completely unproblematic or can even be compensated within a certain tolerance range due to the telescoping or length-variable bridging element. In particular, in the case of not completely exactly aligned with each other first and second coupling devices, for example, in height offset and / or not exactly aligned concrete slabs, the screw between the concrete slabs are relatively easy to build, which is due to the corresponding space between the outer surface of the bolt and the Threaded bolts, length-adjustable bridging element is ensured. The applied by the screw tension between the concrete slabs thereby prevents drifting apart or moving apart of bayed concrete slabs. Due to the pourable in the processing state or pasty potting compound, which gradually hardens or solidifies after the introduction into the space between the lateral surface of the bolt and the inner boundary surfaces of the bridging element, also a high-strength coupling between the concrete elements with respect to acting radially to the screw axis forces , Especially with respect to lateral displacement forces against the concrete slabs scored, which would lead without sufficient counter forces to a lateral offset between the tiered concrete slabs. Thus, a highly stable, quickly and easily activated, masstolerante or tolerance compensating and also statically unambiguously calculable connection device for concrete slabs is created by the inventive design.

Of particular advantage are the measures according to claim 2, as this concrete slabs, which are to be arranged with a defined gap to each other, for example between 0.5 cm and 3 cm are spaced apart, yet expresses robust and sufficiently non-positive or positive locking can be coupled together. In particular, this ensures that the potting compound to be introduced into the free space around the bolt fills this clearance as completely as possible or to a sufficient extent. In particular, this can be avoided that the potting compound flows in the course of the introduction into this space to a great extent in the gap between the juxtaposed concrete slabs and thus insufficient filling and limited stability could come about. Ultimately, these measures ensure that even with tolerance-dependent stringing together of concrete slabs ultimately reliable or on schedule stable connection between the concrete slabs can be built.

Increased expediency are the measures according to claim 3, as this is a completely exact juxtaposition of concrete slabs to be joined is not required after the variable length or telescoping bridging element is able to compensate for certain tolerances in the gap between the facing faces of concrete slabs to a corresponding extent. In addition, an unwanted, automatic change in the bridging length of the bridging element is thereby avoided or obstructed. The establishment of the connection can thereby be simpler and faster.

According to an expedient embodiment, it is provided that the bridging element is dimensioned with regard to its available adjustment or adjustment path such that its end facing away from the screw head of the at least one bolt, that is the end closest to the further coupling device, in the intended use or assembly state the other coupling device or alternatively is supported on the concrete surface of the bayed concrete slab or load-bearing can rest thereon. This creates a stable, mutual support or connection between the adjacent concrete slabs. In particular, this reduces the bending moment acting on the at least one bolt, after at least part of the bending moment can be absorbed or absorbed by the bridging element, which surrounds or at least envelops the at least one bolt outside. Consequently, the Auslangen can be found with bolts, which is a relative have small diameter. For example, it may be possible that by the force-like interaction between the at least one bolt and the bridging element with bolts of dimension M24 Auslangen can be found, while in a version without a supporting bridging element a bolt of dimension M30 or larger would be required in order to be able to meet the static requirements, in particular in order to be able to withstand the occurring bending moments. This allows subsequently a smaller size of the connecting device. Furthermore, this can simplify their production and application, reduce their production costs and reduce the amount of potting compound required. It is essential that the at least one bolt inside the bridging element, which bridging element is dimensioned larger in comparison with the bolt in terms of its diameter or cross section, is stressed primarily after the hardening of the potting compound to train or shear. At most, acting buckling or bending forces between two interconnected concrete slabs can be so intercepted or reduced mainly by the load-transmitting supported bridging element or can thereby be reduced to the at least one bolt acting bending moment. In addition, this makes it possible to use the connecting device even with concrete slabs with relatively low wall thicknesses.

Also advantageous is the development according to claim 4, as a practicable adjustment and reliable maintenance of the desired or required bridging length can be ensured. In addition, such adjustability is intuitively recognizable and easy to perform for the user.

According to an expedient embodiment, it can be provided that the bridging element comprises a hollow cylindrical feed sleeve with external thread, which is adjustable by means of an internal thread in a bore of a support plate relative to the support plate, or telescopically adjustable by means of an internal thread in a receiving tube. As a result, tolerances with respect to the gap dimension between adjacent concrete slabs can be actively compensated by moving the feed sleeve relative to the first coupling device or twisting it. For example, a desired enlargement of the gap dimension can thereby be made active and the desired gap dimension can be set fairly accurately and rapidly. In particular, this can also be a wedge-shaped gap be at least approximately compensated or eliminated between adjacent concrete slabs. Such wedge-shaped intermediate gaps can assume undesirably large dimensions, in particular in the case of slightly uneven concrete foundation surfaces and when using high concrete slabs, which, however, can be effectively counteracted by the specified design. Difficult lifting or positioning work with heavy load cranes can thus be reduced. In particular, by the specified measures, if necessary, the accuracy or precision of a concrete wall to be built can be increased in a simple manner, without time and machinery consuming lifting and alignment work is required.

Also useful are the measures according to claim 5, as this relatively high torques can be applied to the bridging element or on the Zustellhülse and in conjunction with simple auxiliary tools, such as wrenches, sockets or electrically or pneumatically driven Schraubwerkzeugen, any positioning and / the component tolerances of concrete slabs can be easily reduced or compensated. In particular, difficult or mostly time-consuming crane work for exact alignment of the individual concrete slabs can thereby be withheld. An adjustment of the bridging element and an influence on the gap between successive concrete slabs is easily possible even with relatively large and thus heavy plate elements. The pressure effect of the feed sleeve and the pulling action of the at least one bolt also results in defined, static conditions, which favor the stability, the compensating ability and the practicality of the connecting device.

Of particular expediency are the measures according to claim 6, since thereby the screw can be constructed in advance by means of at least one bolt or can be finally made with the appropriate tightening torque and subsequently via the at least one filling channel in the processing state still flowable potting compound in the free space can be introduced around the shaft or the lateral surface of the bolt. A further advantage is that with an appropriate dimensioning of the cross section of the flow channel or with a corresponding definition of the flow resistance of the filling channel, an undesired outflow of introduced, flowable or pasty potting compound in the processing state is avoided or can be obstructed. In particular, an undesired outflow of the potting compound can be stopped immediately after their introduction or completely avoided. In addition, a comfortable and easy handling is achieved with appropriate channel management and positioning of the filling channel. In particular, it is not absolutely necessary to perform the filling of the free space around the lateral surface of the screw body parallel to the screw axis or before the insertion or attachment of the bolt, but is via this filling channel in an effective way a backfilling of the cavity radially to the screw axis or . with an already attached bolt easily feasible.

Also useful are the continuing measures according to claim 7, as a sufficient or complete filling of the free space in the bypass channel can be ensured by means of the potting compound to a high degree. In particular, a high-quality or reliable connection can be created by this, after the degree of filling can be visually checked or a simple control measure for complete or sufficient filling of the corresponding cavity by means of the gradually hardening potting compound is created.

Also advantageous are further developing measures according to which a control opening for the outlet of flowable potting compound is positioned higher with respect to a vertical plane, as an upper boundary surface of the inner free space of the bridging element and / or according to which the control channel with respect to the flowable potting compound has a higher flow resistance , as the flow resistance for the flowable potting compound in the inner space of the bridging element is. As a result, a high reliability with regard to a complete or as complete as possible filling of the bypass channel with potting compound can be achieved. In particular, any possible application errors in the course of the introduction of the potting compound can thus be almost ruled out, whereby the application security can be increased and the guarantee for the occurrence of the desired properties of the connection device can be maximized.

Also advantageous are the measures according to claim 8, since thereby the bolt the corresponding tensile or compressive forces reliably on the first coupling device or can apply between the juxtaposed concrete slabs. In addition, a robust coupling or a stable transmission of the respective forces can be ensured even with a relatively large, radial clearance between the lateral surface of the bolt and the inner boundary surface of the bridging element. Furthermore, it is advantageous that an undesired outflow of pourable potting compound which is flowable in the processing state is avoided or prevented by the most complete possible covering or by the most complete possible closure of the axial end of the bridging channel closest to the screw head. In particular, the underlay plate thus fulfills, in addition to a force or pressure distribution function, the function of a closure stub or a closure plate for the axial end of the bridging or screw channel facing or nearest the screw head. As a result, a complete or at least approximately complete embedding of the at least one screw bolt is supported within the subsequently introduced potting compound and a highly reliable transmission or absorption of the forces occurring is achieved.

Also useful are the measures according to claim 9, since thereby the first coupling device unhindered in the corresponding concrete slab can be at least partially integrated or poured and via the corresponding receiving or connection housing, which then a manipulation shaft or mounting box for attaching the at least one Bolt defined, a stable screw connection between the concrete slabs can be easily constructed. In addition, it is thereby made possible that the concrete slabs can be lined flush with each other and in particular no present as a result of the connecting device laterally projecting connecting elements or components. In particular, an absolutely flat or flush inner and / or outer wall surface of the corresponding concrete wall can thereby be made available.

A practicable embodiment for the corresponding receiving box or assembly free space is defined by the fact that the connection housing comprises a trough-like base element whose at least one access opening or its interior can be closed by means of a plate-like cover element. In addition, a virtually invisible or protected from access screw connection between the two coupling devices or between the juxtaposed concrete slabs can be created by the specified, plate-shaped cover element.

Also of advantage are the measures according to claim 10, as a high-strength anchoring of the connection housing with respect to the concrete of the concrete slab can be ensured. In addition, in the course of the production of the concrete slab in combination with the at least partially cast-in, first coupling device an uncomplicated production or production process can be ensured.

Also useful is the embodiment according to claim 11, since thereby the second or further coupling element is constructed technically particularly simple. In particular, while the bore and the thread introduced therein assumes a reliable anchoring function, after the connecting forces receiving or providing bolts is screwed into it and so the required connection forces can be added calculated.

According to an advantageous development it can be provided that the hole in the metallic anchoring element is formed as a through hole with continuous internal thread and this through hole is provided on the opposite side of the bolt for screwing acting as a load distribution element anchoring rod. This allows the hole with the corresponding thread fulfill a multiple function, after in the opposite relative to the bolt end of the anchoring block a concrete drawbar or reinforcing rod can be screwed individually. In particular, depending on the width or dimension of concrete slabs to be produced in each case adapted anchoring tie rods, in particular suitable lengths of the tie rods, if necessary, can be screwed. Time-consuming or check-requiring welded joints between the anchoring block and the corresponding tie rod are thus unnecessary, so that the corresponding quality requirements can be met secured.

Also useful is a development according to claim 12, characterized in that even at slightly angularly extending concrete slabs or in the presence of a slightly convergent or wedge-shaped gap between juxtaposed concrete slabs improved tightness of the bypass channel can be achieved within the bridging element between the adjacent concrete slabs. In particular, this allows the scheduled Incorporation facilitated by the flowable in the processing state potting compound or improved. In addition, it is thereby possible to use casting compounds which are relatively low viscosity in the course of processing and are therefore easy to incorporate or have the best possible filling behavior.

The object of the invention is also achieved by a concrete wall according to claim 13. The advantageous effects and technical effects which can be achieved with this are to be taken from the preceding description sections and the following description parts.

Also expedient are the provisions according to claim 14, as a rational production of appropriate concrete slabs is thereby made possible and subsequently a simple assembly of the corresponding concrete wall can be accomplished. In particular, by simple juxtaposition of the individual plate elements and by attaching the at least one bolt quickly and easily assembled from several concrete slabs, heavy duty concrete wall can be constructed. The term stringing together is to be understood as juxtaposition of concrete slabs in the horizontal and / or vertical direction. The correspondingly constructed wall elements are directly loadable and in particular no longer has to be paid attention to hardening or hardening times of ready-mixed concrete. In addition, costly quality checks of welds are obsolete.

An embodiment according to claim 15 is also practical since this makes it possible to sufficiently compensate or completely eliminate any positioning tolerances or tolerances in the component dimensions by means of the bridging element. In addition, a non-positive, as far as possible play-free connection between juxtaposed concrete slabs is ensured by the individually required in each required length individually fixable or fixable bridging element. In particular, despite the formation of a plangemäßen gap between juxtaposed concrete slabs a tensile or shear force related reduction of this plangemäßen gap can be avoided after the length-fixed bridging element acts in the manner of an adjustable or adaptable distancing element between the lined concrete slabs. In addition to the tolerance-compensating function of the bridging element, it is therefore also advantageous that this bridging element represents a sufficiently pressure-stable, dimensionally stable distancing or spacing element between the mutually facing end faces or narrow surfaces of concrete slabs. As a result, stable or heavy-duty concrete walls or composite concrete enclosures, for example, for industrial filtration systems can be constructed.

Also advantageous are the measures according to claim 16, as this particularly airtight housing can be created from concrete walls, which are particularly useful when used as a filter housing for industrial filtration systems of particular benefit and high efficiency. In particular, disadvantageous extraneous or false air inflows via the concrete wall can thus be virtually ruled out. The corresponding sealing effect can be maintained reliably or maintenance-free over a longer period of time.

According to an expedient embodiment, it is provided that the at least one sealing element is at least predominantly or preferably completely formed from plastic. The workability or mountability of a sealing element made of plastic is easy and relatively simple. In addition, temperature-related thermal expansions in the concrete slabs can be reliably absorbed or compensated for by such a sealing element, so that cracking or tension in the corresponding structure is obstructed.

It may also be advantageous if the sealing element comprises a sealing cord, in particular of a foam plastic or of a heat-resistant fiber material, which sealing cord is pressed under elastic deformation in the gap between facing surfaces or narrow sides of juxtaposed concrete slabs, after such a, cord - or strip-like sealing element in its handling is particularly simple and can be introduced without special tools or without special expertise in the gap between the concrete slabs. This favors the execution quality and the maintenance of high quality standards, after no special requirements have to be placed on the type of introduction or processing. In addition, it can also be used at higher process temperatures, such as those that occur in the treatment or dedusting of gases or air flows in the iron or cement industry In the long term, reliable and practical room or chamber seals can be created.

Finally, the fact that the sealing element comprises an originally pasty, gradually hardening grout, in particular a silicone-containing or mineral filling compound, which is introduced into the gap while taking its pasty, flowable processing state, the quality or the reliability of the sealing effect between adjacent Concrete slabs are improved. In addition, by these measures, when applied in combination with the above-described measures relating to a sealing cord, a saving in pasty sealant can be achieved. In addition, the processing of flowable sealant is relatively easy when the gap in which the sealant is to be introduced, is limited in the depth direction, in particular by a previously inserted, for example, cord-like sealing body is spatially defined. Especially when the pasty in the processing state filling compound compared to a string-like sealing cord is relatively expensive or in the handling or processing is relatively time consuming and thus more expensive, economic benefits can be achieved. In addition, a high-quality seal can be ensured by the high level of equalization or filling capacity of pasty filling or grout in the processing state, which can nevertheless be realized or constructed at relatively low cost.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Fig. 1

eine zwei Betonplatten umfassende Betonwand in perspektivischer Ansicht, welche Betonplatten durch eine erfindungsgemäße Verbindungsvorrichtung zusammengehalten werden;

Fig. 2

die zur Verbindung von Betonplatten ausgebildete Verbindungsvorrichtung nach Fig. 1 in perspektivischer Explosionsdarstellung;

Fig. 3

eine Seitenansicht auf die Betonwand und die Verbindungsvorrichtung gemäß Fig. 1;

Fig. 4

die Verbindungsvorrichtung nach Fig. 1 in perspektivischer Detailansicht auf das einstellbare Überbrückungselement in Kombination mit einem nur partiell dargestellten, geöffneten Anschlussgehäuse;

Fig. 5

einen Horizontalschnitt durch eine Betonwand nach Fig. 1 in Höhe der Verbindungsvorrichtung zwischen den Betonplatten;

Fig. 6

eine Betonwand in perspektivischer Ansicht mit winkelig zueinander verlaufenden Betonplatten, welche durch eine zweite Ausführungsform von erfindungsgemäßen Verbindungsvorrichtungen miteinander gekoppelt sind;

Fig. 7

die Betonwand nach Fig. 6 in Seitenansicht.

In each case, in a highly simplified, schematic representation:

Fig. 1

a concrete wall comprising two concrete slabs in a perspective view, which concrete slabs are held together by a connecting device according to the invention;

Fig. 2

the connecting device designed for connecting concrete slabs Fig. 1 in a perspective exploded view;

Fig. 3

a side view of the concrete wall and the connecting device according to Fig. 1 ;

Fig. 4

the connecting device after Fig. 1 in a perspective detailed view of the adjustable bridging element in combination with an only partially shown, open terminal housing;

Fig. 5

a horizontal section through a concrete wall Fig. 1 at the level of the connecting device between the concrete slabs;

Fig. 6

a concrete wall in perspective view with angularly extending concrete slabs, which are coupled together by a second embodiment of connecting devices according to the invention;

Fig. 7

the concrete wall after Fig. 6 in side view.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

In the Fig. 1 to 5 a connection device 1 designed according to the invention for the mechanical coupling or connection of concrete slabs 2, 3 is illustrated. The concrete slabs 2, 3 are correspondingly Fig. 1 lined up in such a way that they represent a concrete wall 4 and a section of a concrete wall. In addition to the two serially adjoining concrete slabs 2, 3, it is of course also possible to line up a plurality of concrete slabs and to couple them to each other by means of the connecting device described in detail below. Of course, it is also possible to couple two concrete slabs 2, 3 via a plurality of connecting devices 1 with one another in order to increase the mechanical connection stability. In particular, it is possible to have several, in provide a distance superposed connection devices 1 per concrete slab 2, 3. It is also possible to provide two or more vertically stacked rows of vertically oriented concrete slabs to achieve the desired or required wall height. Also between such stacked concrete slabs, the specified connection device 1 can be used for the mechanical coupling of the supported concrete slabs, in which case the orientation or pulling direction of the connecting device 1 is directed vertically. In addition, it is possible to provide such a juxtaposition of concrete slabs 2, 3 extending over an angle and thus form a Wandeck, as in Fig. 6 is shown by way of example. By appropriate integration of the individual elements of the connecting device 1 in the respective, provided as corner parts concrete slabs 2, 3, it is also possible to carry out such a corner connection by means of the specified connection device 1.

The concrete slabs 2, 3 are so-called precast concrete slabs, which are prefabricated and are held together or assembled at the site of the planned erection by means of the connecting devices 1. Preferably, the concrete slabs 2, 3 with the components of the connecting device 1 integrated therein are constituted by precast concrete parts of solid concrete which, depending on the static requirements, may be reinforced with iron reinforcement, e.g. Lattice mats, can be provided. Alternatively, it is also conceivable to execute the concrete slabs 2, 3 at least in the center region or outside the zones with the integrated components for the connecting device 1 as a hollow component, in particular as a double-wall system.

In any case, can be easily constructed by the concrete in the corresponding concrete slabs 2, 3 components of the connecting device 1 and large, made of prefabricated individual elements concrete walls 4 with dimensions of several meters, in particular relatively quickly erected in place. For such assembly work at the respective installation site then mainly only to carry out crane work and fitters with suitable screwing tools are required.

In this case, the mechanical connecting device 1 according to the invention comprises a first coupling device 5, which is suitable for pouring in or for at least partial integration into the concrete of a first concrete slab 2 is provided. In addition, the connecting device 1 comprises at least one second or further coupling device 6 which corresponds to the first coupling device 5 and which is provided for pouring or integrating into a further concrete slab 3 to be clad on the first concrete slab 2. With respect to two vertical, juxtaposed concrete slabs 2, 3, the respective coupling devices 5, 6 are integrated into the concrete slabs 2, 3 in at least approximately the same height level. Depending on the height of the concrete slabs 2, 3 and depending on the static requirements can be provided at each connection interface between adjacent concrete slabs 2, 3, a plurality of vertically spaced apart connecting devices 1. The vertical distance between these connection devices 1 may in practice be between 100 cm and 300 cm, typically between 200 cm and 250 cm.

Such a connection device 1 further comprises at least one screw bolt 7, which is provided for the construction of a permanent screw connection between the first and further coupling device 5, 6. Preferably, only one individual bolt 7 is implemented per connecting device 1. Alternatively, it is also conceivable to provide each connecting device 1 a plurality of bolts 7.

In addition, the connecting device 1 comprises at least one telescoping or variable-length bridging element 8, which is formed between the first coupling device 5 and the further coupling device 6 or which extends between the first and second coupling device 5, 6. According to the illustrated embodiment, this length-variable bridging element 8 is associated with the first coupling device 5, in particular mounted on the first coupling device 5 and starting variable from the first coupling device 5 in the direction of the second coupling device 6 variable or telescopic to variable distances or spacings between the two predominantly in the concrete slabs 2, 3 firmly cast coupling devices 5, 6 can accomplish. In the active state of the connecting device 1 is provided that support the first coupling device 5 and the second coupling device 6 via the bridging element 8 load-transmitting, in particular sufficiently pressure stable can abut each other and thus can transmit mutually forces. It is expedient if each connection device 1 a single bridging element 8 is provided. Alternatively, it is also conceivable to provide each connecting device 1 with a plurality of spaced apart bridging elements 8 and / or bolts 7.

It is useful in this case that this telescoping or length-adjustable bridging element 8, which may be designed in the manner of a sleeve or a hollow profile, is provided to be axially penetrated by the at least one bolt 7. The orientation of the at least one bolt 7 is such that the bolt 7 extends in the direction of telescoping or longitudinal variability of the bridging element 8. Accordingly, a screw or longitudinal axis 9 of the bolt 7 is aligned parallel or at least approximately parallel to the adjustment or telescoping axis of the variable-length bridging element 8. For tolerance-free stringing the concrete slabs 2, 3 - as in the Fig. 1 to 5 is shown - the longitudinal axis 9 of the bolt 7 and the longitudinal axis of the bridging element 8 extend coaxially to each other.

In the radial direction to the longitudinal axis 9 of the at least one bolt 7 is provided for at least partial replenishment, originally containing air cavity or free space 10 which is defined at least between the outer surface 11 of the bolt 7 and inner boundary surfaces 12 of the bridging element 8. In particular, the screw bolt 7 is dimensioned with regard to its screw or shaft diameter or the hollow profile-shaped bridging element 8 is dimensioned with respect to its inner cavity such that a free space 10 is formed, through which the bridging element 8 passes from the bolt 7 with lateral or radial clearance can be. The in the axial direction of the bridging element 8 protruding from the bridging element 8, provided with a threaded end of the screw bolt 7 is then provided for bolted anchoring or connection to the second coupling device 6.

Once the at least one bolt 7 is screwed starting from the first coupling device 5 with the second coupling device 6 and in this installed state, the bridging element 8 has usually traversed with lateral clearance and also the bridging element 8 an at least largely uninterruptible Bridging channel between the first coupling device 5 and the second coupling device 6 and between the juxtaposed concrete slabs has built 2, 3, basic requirements for the attachment or insertion of a potting compound 13 are met. In particular, the free space 10 formed radially to the longitudinal axis 9 of the at least one bolt between the lateral surface 11 of the bolt 7 and at least individual inner boundary surfaces 12 of the bridging element 8 for at least partially, preferably as complete as possible, filling with an originally flowable, gradually hardening potting 13th provided as best as possible Fig. 5 is apparent. After curing of this casting compound 13 is thus in the radial direction to the longitudinal axis 9 of the bolt 7, a stable or play-free and unyielding coupling between the first and second coupling device 5, 6 or between the corresponding concrete slabs 2, 3 constructed. In particular, this relative displacements between juxtaposed concrete slabs 2, 3 are reliably prevented in the normal direction to the flat sides. In particular, this high holding or connecting forces can be achieved by which undesirable relative displacements between juxtaposed concrete slabs 2, 3 can be almost excluded. In the cured state of the introduced into the space 10 potting compound 13, which may be made on a mineral basis and / or plastic-based, a pressure-resistant embedding of the bolt 10 in the radial direction to the bridging element 8 and in the radial direction of the bypass channel 14 is provided. The bolt 7 is characterized primarily stressed to shear and train, while bending loads are held back. The bolt 7 can be relatively easily meet high static requirements.

Preferably, the pourable in the processing state casting compound 13 is introduced after the attachment of the bolt 7 in the remaining space 10 around the shank of the bolt 7. With correspondingly long curing times of the potting compound 13 or, in the case of rapid attachment of the bolt 7, it is also possible to introduce at least part of the required potting compound 13 into the free space 10 even before the bolt bolt 7 is inserted.

It is expedient if the adjustable length-variable or telescoping bridging element 8 between an uninterrupted or almost complete bridging channel 14 between mutually distanced, a gap 15 forming concrete slabs 2, 3 defined. As a result, on the one hand a robust mutual support between the coupling devices 5, 6 and between the juxtaposed concrete slabs 2, 3 can be achieved and is also in relatively low viscosity or low viscosity casting compounds 13 a high quality or complete and lossless filling of the remaining space 10 between the bolt 7 and the gap 15 bridging bridging element 8 can be achieved.

The gap 15 between juxtaposed concrete slabs 2, 3 can expediently be between 5 to 30 mm, preferably in about 20 mm. This is dependent, inter alia, on tolerances of the concrete slabs cast by concrete formworks 2, 3 and on the other hand on positioning tolerances in the course of the juxtaposition or erection of the concrete slabs 2, 3. But also technical criteria, such as sealing measures have an influence on the choice of the preferred width of the gap 15 between juxtaposed concrete slabs 2, 3. In order to meet these requirements and environmental conditions, it is provided that the bridging element 8 with respect to its bridging length 16 variably adjustable and also in the respectively set or required bridging length 16 can be fixed. According to a practicable embodiment, the adjustability or the variability of the bridging length 16 of the bridging element 8 is between 2 mm to 50 mm, preferably between 10 mm to 30 mm, with respect to a direction parallel or substantially parallel to the longitudinal axis 9 of the screw bolt 7. The finally set bridging length 16 of the bridging element 8 then corresponds at least approximately to the gap or the width of the gap 15, as best of the Fig. 3 and 5 is apparent.

It is expedient if the respectively desired bridging length 16 of the bridging element 8 is secured by means of at least one thread arrangement 17. Fig. 3 - variably adjustable and fixable. In particular, at least one threaded arrangement 17 can be provided, by means of which the bridging element 8 can be adjusted or adjusted parallel or substantially parallel to the pulling direction or longitudinal axis 9 of the screw bolt 7. In this case, depending on the relative position of the thread assembly 17, a reduction or enlargement of the bridging length 16 is achieved. The pitch of the thread assembly 17 is chosen such that a self-locking or fixing the bridging element 8 is ensured at the respective setting position.

According to an expedient embodiment, it is provided that the bridging element 8 comprises a hollow cylindrical feed sleeve 18. At least a portion of the lateral surface of this hollow cylindrical feed sleeve 18 is in this case with an external thread 19 -. Fig. 2 . 5 - Mistake. This external thread 19 of the feed sleeve 18 corresponds in a first embodiment with an internal thread 20 in a receiving tube 21 for at least partially receiving the Zustellhülse 18, as best of Fig. 5 is apparent. Alternatively, it is also possible that the external thread 19 of the feed sleeve 18 directly with an internal thread 20 'in a corresponding bore 22 of a support plate 23 of the coupling device 5 corresponds and thereby the receiving tube 21 for the Zustellhülse 18 can be eliminated, as in Fig. 2 was indicated by way of example.

Accordingly, the feed sleeve 18 relative to the receiving tube 21 or according to an alternative embodiment relative to the support plate 23 with the bore 22 and the internal thread 20 ', in the axial direction, in particular parallel or approximately parallel to the longitudinal axis 9 of the bolt 7 linearly adjustable and fixable. According to the embodiment, as in the Fig. 3 to 5 is shown, the receiving tube 21 is firmly welded to the support plate 23 so that no dashed lines indicated internal thread 20 'is required. Thus, if a receiving tube 21 is provided with a Innengwinde 20 corresponding to the Zustellhülse 18, the internal thread 20 'in the tag plate 23 is not required, but the receiving tube 21 with the support plate 23 firmly connected, in particular welded. An outer diameter 24 of the receiving tube 21 may correspond approximately to the diameter of the bore 22 in the support plate 23, so that the receiving tube 21 can be at least partially inserted or plugged into the support plate 23 and welded thereto, as well as in Fig. 2 was hinted at. However, if no hollow cylindrical receiving tube 21 is provided, the bore 22 is provided with the internal thread 20 'directly in the support plate 23, which Innenggewinde 20' corresponds to the external thread 19 of the feed sleeve 18 and so a variable length or axial adjustment of the feed sleeve 18 relative to the first and second coupling device 5, 6, in particular relative to the support plate 23 of the first coupling device 5 allows.

By a corresponding rotation of the feed sleeve 18 relative to the receiving tube 21 or relative to the support plate 23 may be a variably adjustable change in the bridging length 16 -. Fig. 3 . 5 - be made. For applying increased torsional or actuating forces, it may be expedient if the bridging element 8 or the feed sleeve 18 has at least one positively acting coupling element 25, 26. This at least one coupling element 25, 26 may - as in the Fig. 4 . 5 schematically represented - be formed by at least one recess or groove 27, or alternatively by at least one driver finger, a polygonal driver profile, or the like. The corresponding, positively acting coupling element 25, 26 is preferably formed in the screw head 28 of the bolt 7 nearest end portion of the feed sleeve 18. The corresponding coupling element 25, 26 is for on-demand, form-fitting coupling with a corresponding auxiliary tool 29, as shown in FIG Fig. 3 indicated by dashed lines provided. This auxiliary tool 29, which corresponds to the at least one coupling element 25, 26 on the feed sleeve 18 may be formed for example by a simple socket wrench or by a Anstecknuss 30 for a ratchet tool. The at least one coupling element 25, 26 is provided in combination with the corresponding auxiliary tool 29 to be able to apply an increased or sufficient torque for screw adjustment of the bridging element 8 and the Zustellhülse 18 toward the second coupling device 6. In particular, can be achieved with respect to the Zustellhülse 18 with such an auxiliary tool 29, which is in particular coupled with the Zustellhülse 18, an increased screwing or tightening torque and can so even with heavy concrete slabs 2, 3 an effortless change or a reliable setting of Bridging length 16 and the respectively desired gap dimension with respect to the gap 15 between juxtaposed concrete slabs 2, 3 can be achieved.

According to the in the Fig. 2 . 3 illustrated embodiment, it is advantageous if the at least one bolt 7 is supported in the active or biased state on the receiving tube 21 and on the support plate 23 load-transmitting.

It is expedient if the first coupling device 5 comprises a cuboid or hollow cylindrical connection housing 31, which is partially or partially poured into the concrete of the first concrete slab 2, as best shown in FIGS Fig. 3 . 5 apparent is. The receiving or connection housing 31 defines at least one access opening 32, via which the interior 34 of the connection housing 31 for the purpose of attachment or manipulation of the bolt 7 is accessible. In particular, the connection housing 31 or its access opening 32 is dimensioned such that the at least one screw bolt 7 can be inserted into the bridging element 8 via the connection housing 31 which is open at least on one side and firmly screwed to the second coupling device 6. It is expedient here if the connection housing 31 comprises a trough-shaped or crucible-like base element 33 with a polygonal or round cross-section, the interior 34 of which is provided by means of a plate-shaped cover element 35, if required. Fig. 2 - Optionally closable and openable.

How best to look Fig. 2 can be seen, the support plate 23 may be formed by a limiting or wall element of the terminal housing 31. In particular, the connection housing 31 may be defined by a sheet-metal bending component, wherein one of the jacket or wall sections of the connection housing 31 defines the support plate 23.

Furthermore, it can be provided that outer surfaces 36 of the connection housing 31 are fixedly connected, in particular welded, to at least one reinforcing bar 37 or at least one anchoring plate 38, as shown in FIGS Fig. 1 . 2 was indicated by way of example. The corresponding reinforcing bars 37 or anchoring plates 38 thereby effect a highly stable or particularly tear-resistant anchoring or integration of the connection housing 31 and the first coupling device 5 within the concrete body of the first concrete slab 2. The reinforcing rods 37 can be executed U- or bow-shaped and An optional anchoring plate 38 may have, if necessary, claw-like end portions or bores, in order to maximize the pull-out strength of the first coupling device 5 within the corresponding concrete body.

How best Fig. 3 It can be seen that it is expedient for an end edge 39 of the connection housing 31 or an end face 49 of the connection housing 31 bordering the access opening 32 to be flush or at least approximately flush with a concrete surface 40 on one of the two flat sides 41 of the concrete slab 2 , As a result, unimpeded access into the interior 34 of the connection housing 31 ensured even if the coupling device 5 partially, in particular for the most part, is embedded in the concrete slab 2.

How best of the Fig. 2 . 5 is apparent, it is expedient if an inner diameter 42 of the bridging element 8 or the Zustellhülse 18 is greater, in particular 1.2 to 5 times, preferably 1.5 to 3 times, is sized larger than a shaft diameter or screw diameter 43 of In this case, the bolt 7 may be formed by a screw in the range between M8 and M30, typically by a screw between M16 and M24, depending on the connection forces or static requirements to be applied. Depending on the inner diameter 42 of the feed sleeve 18 and the screw diameter 43 of the screw bolt 7 inserted therein then there is the corresponding, maximum allowable or available positioning tolerance between the anzureihenden concrete slabs 2, 3 or between the embedded therein coupling devices 5, 6. These component or positioning tolerances relate to the horizontal and vertical plane of a concrete wall to be built. 4

How best of the Fig. 2 . 3 and 5 it can be seen, it is expedient if the screw head 28 of the at least one bolt 7 is assigned a base plate 44. This base plate 44 is preferably dimensioned in terms of their areal extent such that they also with a maximum decentralized positioning of the longitudinal axis 9 of the bolt 7 relative to the central longitudinal axis 45 -. Fig. 2 the bridging channel 14 in the bridging element 8 Fig. 3 the axial end of the bridging channel 14 closest to the screw head 28 is closed in such a manner that an escape from the potting compound 13 which is flowable in the introduction or processing state is avoided or prevented. In particular, this at least one base plate 44 is at least partially, axial closure of the bypass channel 14 and a cover of the bypass channel 14 toward the interior 34 of the connection housing 31 so that uncontrolled leakage of potting compound 13 is prevented in the interior 34 of the connection housing 31. In addition, this base plate 44 causes a distribution of the biasing forces of the at least one bolt 7 on the terminal housing 31, in particular with respect to the support plate 23 and subsequently in relation to the concrete slab. 2

In order to achieve an uncomplicated filling of the bridging element 8 and the corresponding bridging channel 14, at least one leading into the cavity or in the inner space 10 of the bridging element 8 leading filling channel 46 may be provided for introducing the potting compound 13, as best of the Fig. 2 . 5 is apparent. In particular, it is technically possible via this filling channel 46, even then to introduce the potting compound 13 in the remaining cavity of the bridging element 8 when the bolt 7 is already screwed in and optionally already set with the appropriate tightening torque. The filling channel 46 can run substantially radially to the longitudinal axis 9 of the bolt 7, as best of the Fig. 2 . 5 is apparent. According to the illustrated embodiment, it is expedient if the at least one filling channel 46 is formed in a wall of the connection housing 31, in particular within the support plate 23 is executed. The filling channel 46 can be defined by a simple circular bore, or by a groove-like cutout in the support plate 23, which is subsequently closed with a lid or closure element to achieve a lateral boundary of the filling channel 46.

An outlet opening 47 of the filling channel 46 - Fig. 2 . 5 - opens into the interior or in the inner space 10 of the bridging element 8. A filling opening 48 of the filling channel 46 is preferably carried out on an outer boundary surface of the connecting device 1. It may be expedient if the filling opening 48 lies in the same plane as the access opening 32 for access into the interior 34 of the connection housing 31. In particular, in an end face 49 of the connection housing 31, which end face 49 delimits the access opening 32, the filling opening 48 be formed, to which filling opening 48 of the filling channel 46 connects. By appropriate dimensioning of the cover element 35 or by appropriate positioning of the filling opening 48, it is possible that in addition to the access opening 32 and the filling opening 48 can be closed or covered by the cover member 35, whereby optical advantages can be achieved or an outflow of even pasty potting compound 13 can be prevented from the filling channel 46. According to a preferred embodiment, the end face 49 of the connection housing 31 terminates flush with the concrete surface 40 on one of the two flat sides 41 of the associated concrete slab 2.

According to a practicable embodiment, it can be provided that, furthermore, a control channel 50 - Fig. 2 - Is provided, with which the degree of filling checked or complete or sufficient filling of the cavity of the bridging element 8 minus the therein extending portion of the bolt 7, ie the remaining space 10 therein, can be achieved with high reliability. This control channel 50 leads from the inner free space 10 of the bridging element 8 or the Zustellhülse 18 toward an outer boundary surface of the connecting device 1 and the concrete slab 2. It is useful if the control channel 50 via a control port 51 on the outer surface of the connecting device 1 or the concrete slab 2 ends. By way of example, this control opening 51 is positioned in the end face 49 of the connection housing 31 delimiting the access opening 32. Alternatively, it is also possible to provide the control opening 51 and / or the filling opening 48 in the interior of the connection housing 31. This at least one control opening 51 serves to be able to visually check an escape of flowable potting compound 13 from the interior of the bridging element 8 or to ensure a passage and sufficient filling of the free space 10 with potting compound 13.

In the course of the injection or introduction of the potting compound 13 in the interior of the bridging element 8, the potting compound 13 is introduced via the filling opening 48 and the adjoining filling channel 46 in the free space 10, in particular pressed. As soon as the free space 10 between the lateral surface 11 of the screw bolt 7 and the boundary defined by the bridging element 8 is at least predominantly or completely filled, the potting compound 13 pasty in the processing state will subsequently enter the control channel 50 or be gradually transferred into it and ultimately the control port 51 emerge. This is then an indication that the free space 10 has been completely or sufficiently filled up with the potting compound 13, and thus the required stability values or properties of the connection device 1 can be met. The control port 51 and the control channel 50 may advantageously also constitute a venting channel, via which the air originally present in the bypass element 8 or in its bypass channel 14 can escape during the introduction of the potting compound 13, so that the processing reliability or the Quality of filling with potting compound 13 again increased can be. According to a practicable embodiment, the cross-section of the filling and / or control channel 46, 50 is in a range between 10 mm ² to 80 mm ² , which is primarily dependent on the viscosity of the potting compound 13 during its processing state and the required throughput.

Instead of in the connection housing 31 and in the support plate 23 integrated filling or control channels 46 and / or 50, it is also possible to provide at least one pipeline, in particular to weld on an outer surface of the connection housing 31, which pipeline into the intervening free space 10th leads into and / or out of the free space 10 of the bridging element 14.

It may be useful if the control opening 51 is positioned higher with respect to a vertical plane, as an upper boundary surface 52 of the inner space 10 of the bridging element 8, as best of the Fig. 3 or 5 can be seen. In particular, the control opening 51 is at least a few millimeters higher than the upper boundary surface 52 of the inner free space 10 in the bridging element 8. This favors a complete or complete as possible filling of remaining in the bridging element 8, occasionally unbalanced cavity or free space 10 with the potting compound 13, so that the shank or threaded portion of the bolt 7 is completely or as completely embedded in the potting compound 13 and thus firmly or rigidly fixed. Alternatively or in combination, it can also be provided that the control channel 50 has a higher flow resistance with regard to the flowable potting compound 13 than the flow resistance for the flowable potting compound 13 in the inner free space 10 of the bridging element 8. This can also be accomplished that a sufficient or as complete as possible filling of the inner space 10 takes place when the potting compound 13 via the at least one filling channel 46 or via the at least one filling opening 48 is introduced into the space 10 or pressed under pressure. As a corresponding auxiliary tool for this simple cartridge presses are conceivable. In particular, the pourable in the processing state casting compound 13 may be kept in stock in a print cartridge or in another reservoir for pressurized introduction into cavities, channels or joints.

The second coupling device 6, which can be connected via the at least one bolt 7 to the first coupling device 5, essentially comprises a metallic anchoring element 53 for the at least one bolt 7. In addition, anchoring or load distribution elements 56 are provided which have a sufficiently high pull-out strength Ensure against the concrete of the concrete slab 3.

The relatively position tolerant or tolerance forgiving connection between the bolt 7 and the two coupling devices 5, 6 is after the introduction and curing of the potting compound 13 in all directions, in particular also radially to the longitudinal axis 9 of the at least one bolt 7 and perpendicular to the flat sides 41st the concrete slabs 2, 3 almost rigid, ie unyielding even under the influence of high forces. According to the example, the anchoring element 53 is cuboidal. Alternatively, it is of course also possible to perform this anchoring element 53 plate-like, cup-shaped or cylindrical. However, a cuboidal or polygonal outer contour favors the most secure possible anchoring of the anchoring element 53 within the concrete of the associated concrete slab 3. In the metallic anchoring block or anchoring element 53 at least one bore 54 is executed, which is provided with a relative to the screw bolt 7 internal thread 55. In particular, the internal thread 55 in the anchoring element 53 corresponds to the thread of the bolt 7 and thus ensures a sufficiently stable fixing or anchoring of the bolt 7 in the anchoring element 53 of the concrete slab 3.

The anchoring element 53 is at least partially cast in the concrete of the concrete slab 3 or integrated as possible tear-out in it. Surfaces of the anchoring block 53 may be provided with plates, claws or rods to increase the pull-out strength against the surrounding concrete of the concrete slab 3. According to a practical, exemplary embodiment, it can be provided that the bore 54 in the metallic anchoring element 53 is designed as a through-bore with a continuous internal thread 55, as shown in FIGS Fig. 2 . 5 is shown by way of example. This through hole is provided on its opposite side to the screw bolt 7 for fixing or screwing a functioning as a load distribution element 56 anchoring rod 57. The anchoring rod 57 may have a threaded portion at at least one end, which corresponds to the internal thread 55 of the bore 54.

As a result, individually adapted lengths of load distribution elements 56 or anchoring rods 57 can be coupled to the anchoring element 53 in a simple manner. Alternatively, it is also possible to weld the at least one anchoring rod 57 to the anchoring element 53, which is of block-shaped design according to the example.

Fig. 5 shows by way of example a horizontal section through a constructed of two concrete slabs 2, 3 concrete wall 4, which concrete slabs 2, 3 are coupled together via the connecting device 1. One of a plurality of concrete slabs 2, 3 composite concrete wall 4 is suitable for the construction of industrial or residential buildings. In particular, with such a concrete wall 4 so-called filter housing for industrial dust filtration systems, or warehouses or basements can be constructed. The corresponding concrete walls 4 of such a building structure is produced by aligned or by an angular juxtaposition and mechanical connection of several concrete slabs 2, 3. The concrete slabs 2, 3 represent precast concrete slabs in which the individual mechanical components of the connecting device 1 are each at least partially integrated. The mechanical connection between the juxtaposed concrete slabs 2, 3 is thereby constructed by a connecting device 1, as previously described.

It is expedient here if at least one first coupling device 5 and at least one second or further coupling device 6 are cast into the concrete of the respective concrete slab 5, 6 in opposing, immediately adjacent edge sections of the concrete slabs 2, 3 such that connection interfaces 58, 59 of the first and second coupling device 5, 6 on opposite surfaces 60, 61 of the respective concrete slab 2, 3 are usable. The coupling device 5, 6, which are to be offset in interaction with each other are cast in the same height level as possible in the respective concrete slab 2 and 3 respectively. In addition, a concrete cover to the coupling devices 5, 6 selected such that the coupling devices 5, 6 in aligned juxtaposition of the concrete slabs 2, 3 according to Fig. 5 , aligned as possible in alignment with each other. Certain unavoidable tolerances in the installation or with regard to the concrete slabs 2, 3 themselves can be compensated to a certain extent relatively tolerant by the specified connection device 1 or made tolerable. The at least one bolt 7, which screws the two coupling devices 5, 6 together In any case, can also be used and screwed when the two coupling devices 5, 6 and the concrete slabs 2, 3 are not aligned exactly aligned with each other, which will be common practice as a result of component or installation tolerances.

According to a practicable measure, as in Fig. 5 has been illustrated, it is possible that juxtaposed concrete slabs 2, 3 with respect to their immediately adjacent concrete surfaces on their narrow sides facing each other, which form in the illustrated application, the opposing or facing surfaces 60, 61 are spaced by a defined gap 15 to each other , The gap width or the gap progression can be bridged and / or adjusted to a certain extent by means of the connecting device 1, in particular by means of its bridging element 8. In particular, production-related or installation-related clearance tolerances between immediately successive concrete slabs 2, 3 by the variable-length bridging element 8 are variably adjustable or bridged. Thus, it can be achieved by the specified connection device 1, that immediately successive concrete slabs 2, 3 despite tensile force of the at least one bolt 7 via the variable length adjustable and fixable bridging element 8 are mutually supported and are kept at a defined distance from each other. In particular, the bridging element 8 or its infeed sleeve 18 lies in the planned assembly or installation state in a load-transmitting manner on a surface, in particular on an end face of the anchoring element 53 and / or on the concrete slab 3.

According to a further development, it can be provided that the first coupling device 5 has a closure plate 62 which, for example, terminates flush with the narrow side or with the frontal surface 60 of the concrete slab 2. This end plate 62 can define the connection interface 58 of the first coupling device 5. According to the illustrated embodiment, this end plate 62 is positioned at a predefined distance to the connection housing 31 and to its support plate 23. The area defined by this distance is occupied by concrete of the concrete slab 2. In particular, the integration or the installation of the coupling device 5 in the concrete formwork for the production of the concrete slab 2 can be facilitated by this end plate 62. In addition, by these measures, the anchoring strength of the coupling device 5 can be increased within the concrete slab 2.

Especially when the specified concrete wall 4 is provided for the construction of basements or filter housings, it is expedient if the structurally defined or structurally provided gap 15 between the narrow sides or frontal, mutually facing surfaces 60, 61 of juxtaposed concrete slabs. 2 3 is at least partially filled by means of at least one sealing element 63, as shown in FIG Fig. 5 is exemplified. The at least one sealing element 63 can be formed from plastic and / or from mineral or textile materials. According to the example, the gap 15 is provided in the vicinity of only one of the two flat sides 41 of the concrete slabs 2, 3 with a sealing element 63. Of course, it is also possible, on both opposite flat sides 41 of the corresponding concrete wall 4 per a seal member 63 in the longitudinal direction of the gap 15, according to the example running in the vertical direction to provide.

The at least one sealing element 63 within the gap 15 may comprise at least one sealing cord 64 of foam plastic or of a heat-resistant fiber material. This sealing cord 64 is pressed under elastic deformation in the gap 15 between facing narrow sides or surfaces 60, 61 of juxtaposed concrete slabs 2, 3. In order to increase the elastic deformability or compressibility of the sealing cord 64, it may also have a hollow-cylindrical or elliptical cross-section. The sealing cord 64 may represent so-called endless or by meter, which can be inserted or pressed into the gap 15 easily depending on the length required in each case.

Alternatively or in combination with such a sealing cord 64, it is also possible for the sealing element 63 to comprise a pasty, gradually hardening grout 65 of plastic and / or mineral-based during processing. In particular, a silicone-containing or mineral filling compound can be provided, which is introduced into the gap 15 when taking its pasty, flowable processing state. Especially when a combination of sealing cord 64 and grout 65 is introduced into the gap 15 between two concrete slabs 2, 3, an optimal sealing result or a long-term reliable sealing element 63 is created.

In the Fig. 6 . 7 are at an angle of 90 ° to each other aligned and by means of two connecting devices 1 firmly interconnected concrete slabs 2 and 3 illustrated. The concrete slabs 2, 2 ', however, are aligned and coupled via two connecting devices 1 firmly together. The concrete slab 2 'can also be formed by a cast in a ballast bed or a ground strip foundation.

How best Fig. 7 it can be seen, the concrete slabs 2, 3 on their mutually facing surfaces 60, 61, the connection interfaces 58, 59 of the first and second coupling device 5, 6 on. In the illustrated embodiment, especially the second coupling device 6, which is largely cast in the second concrete slab 3, comprises a plurality of load distribution elements 66 pointing in different directions, in particular anchoring rods and / or anchoring plates 67, in order to increase the pull-out strength against the concrete body of the concrete slab 3 increase. It is expedient here if the anchoring rods or concrete iron cast into the concrete of the concrete slabs 2, 3 are formed by so-called ribbed steel. According to the illustrated embodiment, the optionally present cover elements 35 can be made selectively connectable and removable by means of bow-shaped retaining springs 68 with respect to the respective associated connection housing 31.

According to an expedient embodiment, as described in Fig. 7 is illustrated with dashed lines, it is also possible that the bridging element 8 and its Zustellhülse 18 in the end remote from the screw head 28 of the at least one bolt 7 end portion at least one elastically resilient sealing element 69, which in the axial direction of the at least one bolt 7 against the corresponding end face or end portion of the bridging element 8 protrudes. The sealing element 69 may be formed by a simple O-ring, which is at least partially received or held in a corresponding groove in the end face of the bridging element 8 or the Zustellhülse 18. Alternatively or in combination, it is also possible to provide a sealing element 69 with at least one relatively far projecting sealing lip on the outer circumference and / or on the distal end face of the bridging element 8, so as to be able to achieve a far-reaching equalization or equalization capability. In particular, this makes it possible to adequately seal the transition section between the connection interfaces 58, 59 and thus to produce an undesired outflow of the potting compound 13 which is flowable or pasty in the processing state. Fig. 5 - be ensured even if the concrete slabs 2, 3 are relatively tolerant or slightly skewed are aligned with each other.

The embodiments show possible embodiments of the connecting device 1 and the thus constructed concrete wall 4 wherein it should be noted that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are mutually possible and this variation possibility the doctrine of technical action by objective invention in the skill of those working in this technical field is the expert.

Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

The task underlying the independent inventive solutions can be taken from the description.

Above all, the individual in the Fig. 1 to 5 and 6 . 7 shown embodiments form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.

For the sake of order, it should finally be pointed out that in order to better understand the structure of the connecting device 1 or the concrete slabs 2, 3, these or their components have been shown partly unevenly and / or enlarged and / or reduced in size. <B> Reference Numbers </ b> 1 connecting device 31 connection housing 2 concrete slab 32 access opening 3 concrete slab 33 base element 4 concrete wall 34 inner space 5 first coupling device 35 cover element 6 another coupling device 36 outer surfaces 7 bolt 37 rebar 8th bridging element 38 anchor plate 9 longitudinal axis 39 front edge 10 free space 40 B eton surface 11 lateral surface 41 flat side 12 inner boundary surfaces 42 Inner diameter 13 potting compound 43 Screw diameter 14 bypass channel 44 shim 15 gap 45 central longitudinal axis 16 bridging length 46 filling channel 17 thread arrangement 47 outlet opening 18 the advancing 48 filling opening 19 external thread 49 face 20, 20 ' inner thread 50 control channel 21 receiving tube 51 inspection hole 22 drilling 52 boundary surface 23 support plate 53 anchoring element 24 outer diameter 54 drilling 25 coupling element 55 inner thread 26 coupling element 56 Load distribution selement 27 groove 57 anchoring rod 28 screw head 58 Connection interface 29 auxiliary tool 59 Connection interface 30 Anstecknuss 60 area 61 area 62 End plate 63 sealing element 64 sealing cord 65 grout 66 Load distribution selement 67 anchor plate 68 retaining spring 69 sealing element

Claims (16)

1. A connecting device (1) for mechanically coupling concrete slabs (2, 3), in particular prefabricated concrete slabs for concrete walls (4), comprising a first coupling device (5), which is provided for embedding in or integrating with, a first concrete slab (2), at least one further coupling device (6) corresponding to the first coupling device (5), which is provided for embedding in or integrating with, a further concrete slab (3) to be joined to the first concrete slab (2), and at least one screw bolt (7), which is provided for establishing a screw connection between the first and the further coupling device (5, 6), characterised in that a telescopic or adjustable variable-length bridging element (8) is formed between the first coupling device (5) and the further coupling device (6), which bridging element (8), through which the at least one screw bolt (7) passes, is provided in the interest of telescopic capability or length-variability of the bridging element (8), and in that a radial free space (10) when seen in relation to the longitudinal axis (9) of the at least one screw bolt (7) is provided between the outer surface (11) of the screw bolt (7) and the inner boundary surfaces (12) of the bridging element (8) which while in the processing stage is at least partially filled with a flowable and gradually hardening casting compound (13).
2. The connecting device according to claim 1, characterised in that the bridging element (8) is provided for forming a bridging channel (14) between spaced-apart concrete slabs (2, 3), thereby forming a gap (15).
3. The connecting device according to claim 1 or 2, characterised in that the bridging element (8), as regards its bridging length (16), can be variably adjusted and fixed.
4. The connecting device according to one of the preceding claims, characterised in that the bridging element (8) comprises at least one thread configuration (17), with which the bridging length (16) of the bridging element (8) can be variably adjusted and fixed.
5. The connecting device according to one of the preceding claims, characterised in that the bridging element (8) or hollow-cylindrical advancement sleeve (18) of the bridging element (8) comprises at least one coupling element (26), in particular at least one nut (27), at least one driver finger or multi-edged driver profile, which coupling element (26) is adapted for form-locked coupling, if required, with a corresponding auxiliary tool (29), in particular a socket wrench or a socket (30), and is designed for applying a torque in order to adjust the screw of the bridging element (8) or the advancement sleeve (18) in direction of the further coupling device (6).
6. The connecting device according to one of the preceding claims, characterised in that at least one filling channel (46) for the casting compound (13) is formed, which leads into the inner free space (10) of the bridging element (8).
7. The connecting device according to one of the preceding claims, characterised in that at least one control channel (50) with at least one control opening (51) is formed for the exit of flowable casting compound (13), which extends between the inner free space (10) of the bridging element (8) in direction of an outer boundary surface of the connecting device (1) or the concrete slab (2).
8. The connecting device according to one of the preceding claims, characterised in that a screw head (28) of the at least one screw bolt (7) has a base plate (44) assigned to it, which base plate (44), as regards areal extension, is dimensioned such that even for a maximum decentralised positioning of the longitudinal axis (9) of the screw bolt (7) in relation to the central longitudinal axis (45) of the bridging channel (14), the axial end of the bridging channel (14) nearest the screw head (28) is sealed such that the flowable casting compound (13) when injected is prevented or held back from exiting.
9. The connecting device according to one of the preceding claims, characterised in that the first coupling device (5) comprises a cuboid or hollow-cylindrical connection housing (31) which is dimensioned such that the at least one screw bolt (7) can be inserted via the connection housing (31) into the bridging element (8) and screwed to the further coupling device (6).
10. The connecting device according to claim 9, characterised in that outer surfaces (36) of the connection housing (31) are firmly connected, in particular welded, to at least one rebar (37) or at least one anchoring plate (38).
11. The connecting device according to one of the preceding claims, characterised in that the further coupling device (6) comprises a metallic anchoring element (53), which comprises at least one bore (54) corresponding with a female thread (55) opposite the screw bolt (7).
12. The connecting device according to one of the preceding claims, characterised in that the bridging element (8), in an end section facing away from the screw head (28) of the at least one screw bolt (7), comprises at least one elastically yielding sealing element (69), which protrudes in axial direction of the at least one screw bolt (7) relative to this end section of the bridging element (8).
13. A concrete wall (4) for erecting buildings for industrial or private use, in particular filter housings, warehouses or cellars, the concrete wall (4) being manufactured by joining and mechanically connecting a number of prefabricated concrete slabs (2, 3) with one another, characterised in that the mechanical connection between the adjoining concrete plates (2, 3) is formed by at least one connecting device (1) according to one or more of the preceding claims.
14. The concrete wall according to claim 13, characterised in that, in opposing edge sections of the concrete slabs (2, 3), at least one first coupling device (5) and at least one further coupling device (6) respectively, is embedded in the concrete of the concrete slabs (2, 3) in such a way that connecting interfaces (58, 59) of the first and further coupling device (5, 6) can be used at respectively facing surfaces (60, 61) of the concrete slabs (2, 3) to be connected, and the first and further coupling device (5, 6) of two adjoining concrete slabs (2, 3) can be screwed together by means of at least one screw bolt (7).
15. The concrete wall according to claim 13 or 14, characterised in that adjoining concrete slabs (2, 3), with reference to their directly adjacent facing surfaces (60, 61), are spaced apart from one another by a defined gap (15), wherein a gap width or a gap variation can be set by means of the connecting device (1), in particular can be adjusted by means of its bridging element (8), or wherein a manufacture-related or erection-related gap-size tolerance between directly adjoining concrete slabs (2, 3) can be variably adjustably bridged by the variable-length bridging element (8), so that directly adjoining concrete slabs (2, 3), despite the effect of the traction force of the at least one screw bolt (7), are supported against one another via the bridging element (8) and maintained at a defined distance from one another.
16. The concrete wall according to claim 15, characterised in that the defined gap (15) between adjoining concrete slabs (2, 3) is filled at least partially by at least one sealing element (63).

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