DE8712315U1 - Pipe connection - Google Patents

Description

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The invention relates to a pipe connection for forming a junction point from several pipes having a longitudinal channel in the middle.

Pipe connections are already known in a variety of forms and are used in exhibition construction, scaffolding, shelving and the like. For example, DE-OS 29 50 742 discloses a pipe connection consisting of a connector and at least one pipe, in which a connector leg can be inserted into a pipe and pressed against the inner wall of the pipe using a screw. The connector leg is equipped with a clamping part that is arranged and guided in a receptacle of the connector, and whose clamping surface can be moved beyond the circumference of the connector leg using a screw. In order to achieve various connection structures to form a junction point from several pipes, the connector leg is connected to a T, angle, cross or star element or the like, either fixed or with an adjustable angle. Apart from the need to provide a special connector leg with the corresponding clamping part for each individual pipe connection in such pipe connections, it is also necessary to use special connector parts for each separate type of pipe connection, which is relatively complex.

The invention is based on the object of creating a pipe connection of the type mentioned at the beginning, which is structurally simple, can be used for any angle outlet and at the same time can be securely locked and easily released.

This object is achieved according to the invention in that each pipe has a connection piece inserted into the channel from the front side and a clamping device consisting of two opposite, held together by a screw connection.

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clamping jaws, connected to a fully or partially circumferential, peripheral attachment of a connecting element.

The inventive design of the pipe connection, which is composed of a few, simply constructed individual parts, makes it easy to produce a wide variety of pipe connection shapes, i.e. a wide variety of angular positions between several pipes connected at the end, since only after inserting the connecting parts into the pipes and inserting the clamping devices between these connecting parts and the peripheral attachment of the connector element, the pipes have to be brought into the desired angular position relative to one another and then the screw connections of the clamping devices have to be tightened, whereby the pipes come into firm contact with the end face of the clamping jaws of the associated clamping device and the inner sides of the clamping jaws of the clamping device come into firm contact with the peripheral attachment of the connector element. To adjust the pipe connection, the screw connections' \\ of the clamping devices only need to be loosened until the clamping devices can be pivoted into the new desired position on the peripheral attachment of the connector element, and then the screw connections have to be tightened again.

In order to enable a continuous adjustment of the pipes relative to one another over the largest possible angular range, in the embodiment of the invention the connector element is designed as a disc-shaped semicircle or full-circle connector element, in which the attachment extends peripherally over the circular arc.

According to an advantageous embodiment of the invention, it is provided that the free end of the connecting part is provided with two superimposed, circumferential locking lugs which engage in correspondingly shaped, circumferential grooves in the opposite inner sides

- the clamping jaws of the clamping device engage, that the circular-arc-shaped attachment of the semicircular or full-circle connector element is provided on each long side with a continuous toothing consisting of two teeth, which engage in corresponding, continuous formations in the inner sides of the clamping jaws of the clamping device, and that the clamping jaws of the clamping device can be clamped to the connecting part and the attachment of the semicircular or full-circle connector element by means of the screw connection. These design features result in a particularly high-load connection between the pipe and the connector element. In addition, the round design of the locking lugs and the associated grooves makes it possible to rotate the pipe relative to the clamping device when the clamping device is not tightened.

In a further embodiment of the subject matter of the invention, the locking lugs of the connecting part are frustoconical in cross-section and are each provided with an oblique undercut on their broad side, which engages behind a corresponding step of the associated, circumferential groove in the clamping jaws of the clamping device. This makes the connection process easier on the one hand and increases the clamping surface on the other. The oblique course of the undercut of each locking lug serves to compensate for tolerances.

To further increase the clamping surface and to further facilitate the connection process, the undercut of the internal locking lug of the connecting part changes into a truncated cone-shaped plug-in area, with a correspondingly truncated cone-shaped plug-in opening being let into the inside of the clamping jaw of the clamping device.

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For the purpose of a simple connection between the connecting part and the pipe, the plug-in area of the connecting part preferably merges centrally into a threaded pin that engages in the pipe channel, forming a circumferential shoulder that rests against the front of the pipe channel. The threaded pin of the connecting part is expediently provided with a self-tapping thread, and a hexagon socket blind hole for receiving a corresponding hexagon socket key is let into the front of the external locking lug of the connecting part.

In order to enable the clamping device to be arranged in the most space-saving way possible, the clamping device comprises a cylindrical area, the front side of which rests against the front side of the wall of the pipe, and a conical area, the front side of which rests against the outside of the semicircular or full-circle connector element in a circular arc shape. The screw connection of the two clamping jaws, which extends through the cylindrical area of the clamping device, expediently consists of a ^hexagon socket screw, the head of which is supported in a screw head receptacle of one clamping jaw and the threaded pin of which engages in a threaded hole in the other clamping jaw. To facilitate assembly, a retaining disk is loosely arranged on the shaft of the hexagon socket screw provided between the screw head and the threaded pin, which engages in a corresponding recess in the inner wire of the clamping jaw receiving the threaded pin.

To increase the force transmission, the attachment of the semicircular or full-circle connector element is provided with a plug-in area with a conical cross-section from the outside of the same to its toothing, to which a correspondingly shaped, conical plug-in opening is assigned in the inside of the clamping jaws of the clamping device. Furthermore, the

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Semicircular or full-circle connector element provided with marking grooves on its side surfaces that run at 45° to each other. These marking grooves facilitate the usual angle adjustment between the pipes to be connected.

In order to enable a longitudinal connection to a pipe in addition to the frontal connection of the pipes, according to an advantageous development of the solution according to the invention, the semicircular connector element has dovetail-shaped feet on its straight side, which engage in a correspondingly designed longitudinal groove in a pipe provided with a central channel, whereby the semicircular connector element is clamped to the pipe by means of grub screws extending through the feet and the shoulder. The longitudinal groove of the pipe is expediently formed between two of three webs that hold the central channel of the pipe in its position. In order to be able to make several longitudinal pipe connections to the pipe, in an alternative design of the pipe the central channel is held in position by four webs arranged at 90° to one another and the pipe is provided with two opposite or two offset at 90° to one another or three or four longitudinal grooves arranged at 90° to one another. To further increase the number of longitudinal pipe connections, the pipe is designed as a double-walled pipe, in which four webs evenly distributed around the circumference extend between the central channel and the inner wall and eight webs evenly distributed around the circumference extend between the inner wall and the outer wall, with a dovetail-shaped longitudinal groove being let into the outer wall between the webs supporting them. It is expedient for a longitudinal groove to be let into the bottom of each longitudinal groove in the middle of the opening gap of the longitudinal groove, into which the tips of the grub screws of the semicircular connector element engage.

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In order to enable a further pipe connection in the plane of the semicircular connecting element in addition to the pipe connections carried by it, according to a further advantageous embodiment of the invention, the semicircular connecting element has a recess in the middle of its straight side through which a pipe clamp is passed that encompasses the pipe, which is clamped to the semicircular connecting element via its longitudinal groove. The pipe clamp halves merge in one piece into clamping jaws coupled by a screw connection, the opposite inner sides of which are provided at the end with corresponding circumferential grooves for receiving a connecting part inserted into the central channel of another pipe at the front.

In an alternative design of the pipe clamp, it has two opposing pairs of clamping jaws, each coupled by a screw connection, for the front connection of a pipe. This allows two additional, opposing pipes to be connected to the long side of a pipe in the plane of the semicircular connector element. In another alternative design of the pipe clamp, it has three pairs of clamping jaws, offset by 90° to one another, each coupled by a screw connection, for the front connection of a pipe. This allows the additional connection of three pipes in the plane of the semicircular connector element. Another option for increasing the number of pipe connections in the plane of the semicircular connector element is to insert a connecting part in the middle of the curved outside of the pipe clamp, which is connected via a clamping device to the connecting part inserted in the front in the central channel of another pipe.

In a further advantageous embodiment of the subject matter of the invention, the side surfaces of the full-circle connector element are

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crowned, with one or more threaded holes directed towards the center of the full-circle connecting element, into which connecting parts are inserted, each of which has a clamping device with a front end in the central channel

\ of another pipe.

This allows ₍ in addition to the pipe connections lying in one plane ⁾ further pipe connections at an angle to these pipe connections on the circumferential attachment of the full-circle connector element

to be connected to the full-circle connector element. To increase the force transmission, the connecting parts used on the side surfaces of the full-circle connector element preferably have a cone between the plug-in area and the threaded pin, which engages in a corresponding recess in the associated threaded hole of the full-circle connector element. The threaded holes of the full-circle connector element that are not required are expediently closed with a blind plug.

The idea underlying the invention is explained in more detail in the following description using several exemplary embodiments shown in the drawing. It shows:

Fig. 1 the connection of a half according to the invention

circular connector element on the long side of a pipe, partly in section.

Fig. 2 is a section through the representation of Fig.

along the line H-II.

Fig. 3 is a representation of Figure 1 with several pipes

connections on the semicircular connector element,

Fig. 4 a cross section through an inventive

Full circle connector element with two possible;.-! pipe connections,

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Fig. 5 a view of the representation according to Fig. 4

in the direction of arrow V,

Fig. 6 a cross-section through the full-circle connector element with three possible additional pipe connections,

Fig. 7 is a view of the longitudinal side of a pipe

attached semicircular connector element with an additional pipe connection in the plane of the semicircular connector element,

Fig. 8 a section through the representation according to Fig. 7

according to line VIII-VIII,

Fig. 9 is a view of the longitudinal side of a

Pipe-mounted semicircular connector element with two additional, opposite pipe connections in the plane of the semicircular connector element.

Fig. 10 is a section through the representation of Fig. 9 along the line X-X.

Fig. 11 a view of the semicircular connector element attached to the long side of a pipe with three additional pipe connections lying in the plane of the semicircular connector element, partially in section,

Fig. 12 shows a section through an alternative embodiment of the illustration according to Fig. 11,

Fig. 13 to 10

Cross-sectional views of differently designed pipes for the manufacture of semi-circular and full-circle connecting elements»

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Fig. 19 a view of a pipe latticework made using semicircular connector elements,

Fig. 20 is a view of a tent-like tube lattice made with the help of semicircular connectors,

Fig. 21 is a view of the pipe latticework according to Fig. 20 in the direction of arrow XXI,

Fig. 22 is a view of a semicircular and

Dachsluhl tube latticework made from full-circle connector elements,

Fig. 23 is a section through the latticework of Fig. 22 in the direction of the line XXIII-XXIII.

Fig. 24 a representation of a stair railing made using semicircular connector elements,

Fig. 25 a representation of the longitudinal connection of two pipes using two semicircular connector elements coupled via two clamping devices,

Fig. 26 an angled butt joint between two pipes, in which the semicircular connector elements inserted into the long sides of the pipes are connected by a correspondingly designed clamping device, and

Fig. 27 shows the front and longitudinal connections of pipes to a full-circle connector element.

The connector element 1 shown in Fig. 1 is designed as a semicircular connector element 2 and is attached to the long side of a pipe 3. The pipe 3 has a longitudinal channel 4 in the middle, which is held in position by three webs 5. Between two adjacent webs 5 there is a dovetail-shaped longitudinal groove 6 with the opening gap 7 in the pipe 3. In

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Two dovetail-shaped feet 8 belonging to the semicircular connector element 2 are inserted into the longitudinal groove 6 from the front side of the pipe 3, each of which is arranged at the end on the straight side of the semicircular connector element 2. Grub screws 10 extending through the feet 8 and a peripheral projection 9 of the semicircular connector element 2 are used to fasten the semicircular connector element 2 in the desired position on the pipe 3. The tips 11 of the grub screws 10 engage in a longitudinal groove 13 set into the bottom 12 of the longitudinal groove 6.

The circular-arc-shaped projection 9 of the semicircular connector element 2 is provided on each longitudinal side with a toothing 15 consisting of two teeth 14, to which a corresponding number of pipes 3 with or without a longitudinal pin 6 are connected at the front via one or more clamping devices 16, wherein a connection 17 interacting with the associated clamping device 16 is inserted into the front of each pipe 3.

The free end of each connecting part 17 is provided with two superimposed, circumferential locking lugs 18, which engage in correspondingly shaped, circumferential grooves 19 in the opposite inner sides of the clamping jaws 21, 22 of the clamping device 16, which are coupled by a screw connection 20. On its broad side, each locking lug 18, which has a truncated cone-shaped cross-section, has an obliquely running undercut 23, which engages behind a corresponding shoulder 24 of the associated circumferential groove 19 in the clamping jaws 21, 22 of the clamping device 16. The undercut 23 of the inner locking lug is followed by a truncated cone-shaped plug-in area 25, which engages in a correspondingly truncated cone-shaped plug-in opening in the inner sides of the clamping jaws 21, 22 of the clamping device.

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engages. A threaded pin 28 is connected centrally to the plug-in area 25 of the connecting part 17, forming a circumferential shoulder 27 that rests against the front side of the central channel 4 of the pipe 3. The threaded pin 28 is screwed into an associated threaded hole 29 in the channel 4. The threaded pin 28 can also be provided with a self-tapping thread, which eliminates the need to create the threaded hole 29. In the front side of the external locking lug 18 there is a hexagon socket blind hole 30 for receiving a corresponding wrench.

The clamping device 16 has a cylindrical region 31 through which the screw connection 20 extends and a conical region facing the semicircular connector element 2. The front side of the conical region 32 of the clamping device 16 rests against the outside 33 of the semicircular connector element 16 in a circular arc-shaped configuration, while the front side of the cylindrical region 31 of the clamping device 16 rests against the front side of the wall of the pipe 3. In the inner sides of the clamping jaws 21, 22 of the clamping device 16, continuous formations 34 corresponding to the teeth 14 of the toothing 15 of the projection 9 of the semicircular connector element 2 are embedded in the conical region 32. The projection 9 of the semicircular connector element 9 has a plug-in area 35 with a conical cross-section between its teeth 15 and the outside 33 of the semicircular connector element 2, to which a correspondingly shaped, conical plug-in opening 36 is assigned in the insides of the clamping jaws 21, 22 of the clamping device 16.

The screw connection 20 of the clamping device 16 consists of a hexagon socket screw 37. The clamping jaw 21 has a screw head receiving base 38, on whose shoulder 39 the head 40 of the screw 37 is supported, as well as a through hole 41 of correspondingly smaller diameter for the shaft 42 of the screw 37.

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The other clamping jaw 22 has a threaded bore 43 for receiving the threaded pin 44 connected to the shaft 42 of the screw 37. A retaining disk 45 is loosely arranged on the shaft 42 of the screw 37 and engages in a corresponding recess 46 in the inside of the clamping jaw 22. The clamping jaws 21, 22 are designed in such a way that in the assembled state of the clamping device 16 with the screw connection 20 tightened, a narrow gap 47 remains between the mutually facing inner sides of the clamping jaws 21, 22.

The full-circle connector element 48 shown in Fig. 4 is designed analogously to the semi-circle connector element 2, i.e. instead of the feet 8 of the semi-circle connector element 2, the full-circle connector element 48 has a 360° peripheral projection 9 to which pipes 3 can be fastened at any angle to one another in the manner described above using clamping devices 16 and connecting parts 9. To facilitate the usual angular positions of the pipes 3 to one another, marking grooves 50 running at 45° to one another are provided on the side surfaces of the semi-circle 2 and the full-circle connector element 48. The side surfaces 49 of the full-circle connector element 48 are spherical and provided with a central threaded hole 51 running continuously at a right angle to the projection 9. A blind plug 52, which terminates with the side surface 49, is screwed into the threaded hole 51 from one side and a connecting part 17 is screwed into the other side. This connecting part 17 has a cone 53 between its plug-in area 25 and the threaded pin 28, which engages in a corresponding recess 54 in the threaded hole 51. This connecting part 17 is connected to a connecting part inserted into the central channel 4 of another pipe 3 via a clamping device 16 which is designed as a whole in the shape of a cylinder, the end face of which facing the side surface 49 of the full-circle connector element 48 being adapted to the shape of this side surface 49. It is of course also possible, as shown in Fig. 6

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to create several threaded holes 51 in a specific angle arrangement in the side surfaces 49 of the full-circle connecting elements, to screw the corresponding connection parts 17 into these threaded holes and to connect these connection parts 17 via appropriately designed clamping devices 16 to connection parts 17 inserted into the front of pipes 3.

The semicircular connector element 2 has on its straight side a central, arcuate recess 55. Through this recess, as shown in Figs. 7 and 8, a pipe clamp 56 is passed around the pipe 3, to which the semicircular connector element 2 is attached, and at the free end of which another pipe 3 is frontally "fixed".

side. Each pipe clamp half 57, 58 merges into a clamp jaw 59, 60 in one piece. The two clamp jaws 59, 60 are coupled to one another by a screw connection 20. In the inner sides of the opposing clamp jaws 59, 60 there are circumferential grooves 19 at the end for receiving the locking lugs and an insertion opening 26 for the insertion area of the connecting part 17 screwed into the channel 4 of the pipe 3 by means of the threaded pin 28. The pipe clamp 5G can be fastened at any angle to the semicircular connector element 2 to the pipe 3 carrying the semicircular connector element 2. Fig. 9 and 10 show an alternative pipe clamp 56 with two opposing clamping jaw pairs 59, 60, each coupled by a screw connection 20, to each of which a pipe 3 is connected at the front via a connecting part 17. In the illustration shown in Fig. 11, the curved outer side of the pipe clamp 56, which corresponds to the design of the pipe clamp according to Fig. 10 '$

corresponds, a connecting part 17 is screwed in centrally, which is connected via a clamping device 16 to the connecting part 17 inserted into the channel 4 of a pipe 3. Another alternative embodiment of the pipe clamp 56 is shown in Fig. 12. In this case, the pipe clamp 56 comprises three 90°

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Pairs of clamping jaws 59, 60 arranged offset from one ^another and each coupled by a screw connection 20, whereby the pipe clamp 56 itself comprises only two angle-shaped individual parts 62 and one straight individual part 63. A pipe 3 is connected to each pair of clamping jaws 59, 60 of the pipe clamp 56 on the pin side via a connecting part 17.

In addition to the cross ^- sectional shape of a pipe shown in Fig. 13 with a longitudinal groove 6 for receiving one or more semicircular connector elements 2, it is also possible to provide the pipe 3 with several inlet grooves 6 in order to be able to attach semicircular connector elements 2 which are offset from one another to the pipe 3 at an angle. In the possible cross-sectional shapes of the pipe 3 shown in Figs. 14 to 17, the central channel 4 is held in its position by four webs 5 which are offset from one another by 90°. In the pipe 3 according to Fig. 14, two opposite longitudinal grooves 6 are let into the pipe 3 according to Fig. 15, two are at 90° to one another, and in the pipe 3 according to Fig. 16, three are at 90° to one another, each formed between the corresponding webs 5. In the alternative cross-sectional shape of the pipe 3 shown in Fig. 18, the pipe 3 is designed as a double-walled pipe. In this pipe 3, four webs 5 evenly distributed over the circumference are arranged between the central channel and the inner jacket 64. Between the inner jacket 64 and the outer jacket 65 there are eight webs 5 evenly distributed over the circumference. In the outer jacket 65, a dovetail-shaped longitudinal groove 6 is formed between the webs 5 supporting them. Up to eight semicircular connector elements 2 can therefore be attached in one cross-sectional plane of this pipe 3.

In the tubular latticework shown in Fig. 19, the horizontal struts 66 are connected to the

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Vertical struts 67 connected to vertical struts 68 In the embodiment shown in Figs. 20 and 21 ^, a central tube 3 with eight longitudinal sections 6 carries on its upper edge in a plane eight semicircular connecting elements 2 which are connected to a corresponding number of outgoing transverse struts 68 via clamping devices 16. The other ends of the transverse struts are connected to vertical struts 67 via articulated ball connectors 69. Below the ball connectors 69, horizontal struts 66 extend between the central tube 3 and the vertical planes 67, the horizontal struts ⁶⁶ in turn being held in position by appropriately arranged semicircular connecting elements 2 and clamping devices 16. The horizontal struts 66 can be installed without changing the distance between the central pipe 3 and the vertical struts 67 due to the pipe connection according to the invention. The embodiment shown in Figs. 22 and 23 shows a section of a pipe roof construction in which three horizontal struts 66 and two cross struts 68 arranged offset by 90° to one another are connected to a full-circle connector element 48 by means of clamping devices 16. The opposite horizontal struts 66 connected to the full-circle connector element 48 are connected at their other end to vertical struts 67 via clamping devices 16 and semi-circle connector elements. The upper ends of the vertical struts 67 are connected to cross struts 68 and horizontal struts 66 via ball connectors 69, these cross struts 68 being held in place in the plane of the full-circle connector element 48 by a further ball connector 6-9. A horizontal tube 66 forming the ridge extends from the ball connector connecting these cross struts 68.* The cross struts 68 extending from the full-circle connector element 48 are fastened via clamping devices 16 and semi-circle connector elements 2 to the cross struts 68 held together by ball connectors 69.

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Furthermore, the embodiment shown in Fig. 24 illustrates a stair railing in which semicircular connector elements 2 with associated clamping devices 16 are used to connect the vertical struts 67 to the cross struts 68. The horizontal struts 66 are connected to the vertical struts 67 via appropriately designed pipe clamps with molded clamping devices and a ball connector 69 with associated clamping devices. A ball 70 is connected to the free end of the upper cross strut 68 designed as a handrail via a curved clamping device 16.

In the embodiment shown in Fig. 25, two pipes 3 each have a semicircular connector element 2 on their lengthwise sides, which are connected to one another via two clamping devices 16 that are adjacent to one another at the end. These clamping devices 16 are coupled via a connecting part 17, which is designed as a body that is mirror-symmetrical to its transverse axis 71 with external locking lugs 18 and internal plug-in areas 25, to which corresponding grooves in the clamping jaws 21, 22 of the clamping devices 16 are assigned. In the plane of the screw connections 20 of the clamping devices 16, marking lines 72 run on the outside on these. The arrows 73 indicate the possible pivoting or twisting directions of this pipe connection. In the embodiment shown in Fig. 26, which is analogous to the pipe connection according to Fig. 25, the two semicircular connectors 2 are coupled together by a specially designed clamping device 16, which has only at its end sides in the clamping jaws 21, 22, which are held together by a screw connection 20, formations 34 for receiving the teeth 15 of the lugs 9 of the semicircular connector elements 2.

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The embodiment shown in Fig. 27 illustrates the front-side connection of two pipes 3 and the longitudinal connection of a pipe 3 to a full-circle connector element 48. The front-side pipe connections are made directly via a clamping device 16, while the longitudinal pipe connection is made via a semi-circle connector element 2 attached to the pipe 3, a clamping device 16 and an intermediate disk 74. The intermediate disk 74 serves to compensate for the different contours between the outside of the full-circle connector element 48 and the front side of the clamping device 16. For this purpose, the side of the intermediate disk 74 facing the full-circle connector element 48 is concave and the side of the intermediate disk 74 facing the front side of the clamping device 16 is flat. Accordingly, in this case the connecting part 17 has a cylindrical section 75 between its plug-in area 25 and its cone 53, the dimensions of which are adapted to the through hole 76 of the intermediate disk 74. Of course, the intermediate disk 74 can also be used for other pipe connections.

The described embodiments show the particularly simple and practical construction of the pipe connection according to the invention, the individual components of which are made of aluminum and which, despite its simplicity, proves to be particularly reliable and variable. Although the invention has only been described using a few embodiments, obvious modifications of the solution according to the invention that result from this representation are within the scope of the claimed pipe connection.

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Claims (1)

EXPECTATIONS 1. Pipe connection for forming a junction point from several pipes having a longitudinal channel in the middle, characterized in that each pipe (3) is connected to a completely or partially circumferential, peripheral projection (9) of a connector element (1) via a connecting part (17) inserted into the channel (4) from the front side and a clamping device (16) which consists of two opposing clamping jaws (21, 22) held together by a screw connection (20). 111 to -2- 2. Pipe connection according to claim 1, characterized in that the connector element (1) is designed as a disc-shaped semicircular (2) or full-circle connector element (48), in which the projection (9) extends peripherally over the circular arc. 3. Pipe connection according to claims 1 and 2, characterized in that the free end of the connecting part (17) is provided with two superimposed, circumferential locking lugs (18) which engage in correspondingly shaped, circumferential grooves (19) in the opposite inner sides of the clamping jaws (21, 22) of the clamping device (16), that the circular-arc-shaped projection (9) of the semicircular (2) or full-circle connector element (48) is provided on each long side with a continuous toothing (15) consisting of two teeth (14) which engage in corresponding, continuous formations (34) in the inner sides of the clamping jaws (21, 22) of the clamping device (16), and that the clamping jaws (21, 22) of the clamping device (16) are connected to the connecting part (17) and the projection (9) of the semicircular (2) or full-circle connector elements (48) can be clamped by the screw connection (20). 4. Pipe connection according to claims 1 to 3, characterized in that the locking lugs (18) of the connecting part (17) are frustoconical in cross section and are each provided on their broad side with an obliquely running undercut (23) which engages behind a corresponding shoulder (24) of the associated circumferential groove (19) in the clamping jaws (21, 22) of the clamping device (16). ·« <4 K ll.i t t * · · · ft 1· «tit l H ti &mdash;3&mdash; 5» Pipe connection according to claims 1 to 4, characterized in that the undercut (23) of the inner snap nose (10) of the connecting part (17) extends over a truncated cone-shaped plug-in area (25), a correspondingly truncated cone-shaped plug-in opening (26) being let into the inner sides of the clamping jaws (21, 22) of the clamping device (16). 6. Pipe connection according to claims 1 to 5, characterized in that the plug-in pin (25) of the connecting part (1-7) merges centrally into a threaded pin (28) engaging in the channel (4) of the pipe (3), forming a circumferential shoulder (27) which rests against the front side of the channel (4) of the pipe (3). 7. Pipe connection according to claims 1 to &., characterized in that the threaded pin (28) of the connecting part 117) is provided with a self-tapping thread, j and that a hexagon socket blind hole (30) is recessed into the front side of the external locking lug (18) of the connecting part (17). 8. Pipe connection according to claims 1 to 7, characterized in that the clamping device (16) comprises a cylindrical region (31), the end face of which rests on the end face of the wall of the pipe (3), and a conical region (32), the end face of which rests on the outside (33) of the semicircular (2) or full-circle connector element (48) in a circular arc configuration. * * » * I ft · i -4= 9< Pipe connector according to claims 1 to 8, characterized in that the screw connection (20) of the two clamping jaws (21, 22) extending through the cylindrical region (31) of the clamping device (16) consists of a hexagon socket screw (37) whose head (40) is supported in a screw head receptacle (3B) of one clamping jaw (21) and whose threaded pin (44) engages in a threaded bore (43) of the other clamping jaw (22). 10. Pipe connection according to claims 1 to 9, characterized in that a retaining disk (45) is loosely arranged on the shaft (42) of the hexagon socket screw (37) provided between the screw head (40) and the threaded pin (44), which retaining disk engages in a corresponding recess (46) in the inside of the clamping jaw (22) receiving the threaded pin (44). 11. Pipe connection according to claims 1 to 10, characterized in that the projection (9) of the semicircular (2) or full-circle connector element (48) is provided from the outside (33) thereof up to its toothing (15) with a plug-in area (35) which is conical in cross section and to which a correspondingly shaped, conical plug-in opening (36) in the inner sides of the clamping jaws (21, 22) of the clamping device (16) is assigned. 12. Pipe connection according to claims 1 to 11, characterized in that the semicircular (2) or full-circle connector element (48) is provided on its side surfaces (49) with marking grooves (50) running at 45° to one another. 13. Pipe connection according to claims 1 to 12, characterized in that the semicircular connector element (2) is &bull; * * &diams; f · · * 4 t i lft iri ■· · · ·· -5- straight side has dovetail-shaped feet (Ö) at the end, which engage in a correspondingly designed longitudinal groove (6) of a tube (3) provided with a central channel (4), and that the semicircular connector element (2) is clamped to the tube (3) by means of grub screws (10) extending through the feet (8) and the extension (9). &Idigr;4. Pipe connection according to claims 1 to 13, characterized in that the longitudinal groove (6) of the pipe (3) is formed between two of three webs (5) which hold the central channel (4) of the pipe (3) in its position. 15» Pipe connection according to claims 1 to 13, characterized in that the central channel (4) of the pipe (3) is held in its position by four webs (5) arranged offset by 90° to one another, and that the pipe (3) is provided with two opposite longitudinal grooves (6) or with two offset by 90° to one another or with three or four longitudinal grooves (6) arranged offset by 90° to one another. 16* Pipe connection according to claims 1 to 13, characterized in that the pipe (3) is designed as a double-walled pipe, in which four webs (5) evenly distributed over the circumference extend between the central channel (4) and the inner jacket (64) and eight webs (5) evenly distributed over the circumference extend between the inner jacket (64) and the outer jacket (65), a dovetail-shaped longitudinal groove (6) being let into the outer jacket (65) between the webs (5) supporting it. if 17. RöhfVärLiindüiii? naoli claims 1 to 16 ₁ characterized in that in the bottom (12) of each longitudinal groove (6) § parallel to the opening gap (7) of the longitudinal groove (6) a longitudinal fo extending groove (13) is embedded into which the tips (11) ■y of the grub screws (10) of the semicircular connector element (2) (ß intervene. * 18. Pipe connection according to claims 1 to 17, characterized in that the semicircular connector element (2) is ⁵ straight side has a recess (55) in the middle, through &Ggr; one of the tube (3) which is connected via its longitudinal groove (6) to the I semicircular connector element (2) is clamped. encompassing pipe \\ clamp (56) is passed through, and that the pipe clamp I halves (57, 58) in one piece by a screw connection f dung (20/ coupled clamping jaws (59, 60) whose ji opposite inner sides end with corresponding I^ running grooves (19) for the reception of a front I into the central channel (4) of another pipe (3) inserted connecting part (17). 19. Pipe connection according to claim 18, characterized in that that the pipe clamp (56) has two opposing pairs of clamping jaws (59, 60), each coupled by a screw connection (20), for the front-side connection of a pipe (3). 20. Pipe connection according to claim 18, characterized in that I that the pipe clamp (56) has three 90° offset anti I ordered, each coupled by a screw connection (20) i ; te pairs of clamping jaws (59, 60) for the respective front Connection of a pipe (3). -7- 21. Pipe connection according to claims 1 to 20, characterized in that a connecting part (17) is inserted centrally into the curved outer side (61) of the pipe clamp (56), which is connected via a clamping device (16) to the connecting part (17) inserted at the front into the central channel (4) of another pipe (3). 22. Pipe connection according to claims 1 to 12, characterized in that the side surfaces (49) of the full-circle connector element (48) are spherical and are provided with one or more threaded holes (51) directed towards the center of the full-circle connector element (48), into which connecting parts (17) are inserted, which are each connected via a clamping device (16) to a connecting part (17) inserted at the end into the central channel (4) of another pipe (3). 23. Pipe connection according to claim 22, characterized in that the connecting parts (17) inserted into the side surfaces (49) of the full-circle connector element (46) have a cone (53) between the plug-in area (25) and the threaded pin (28) which engages in a corresponding countersink (54) of the associated threaded bore (51) of the full-circle connector element (48). 24. Pipe connection according to claims 22 and 23, characterized in that the threaded bores (51) of the full-circle connector element (48) which are not required are closed by a blind plug (52).