DE102011012198B4 - Method and device for welding plastic pipes of the same diameter - Google Patents

Abstract

A method for welding plastic pipes of the same diameter, in which by means of friction welding two pipe sections (3) are non-positively connected to each other via a rotatable pipe connector (2), characterized in that an already buried and / or ground-mounted first pipe section (3), a pipe connector (2) with, in opposite end faces (2.1) prefabricated contours and a second cut piece of pipe (3) independently in a horizontal axis to grip and hold that in the end faces (3.1) of the two axially held pipe sections (3) Place both sides and at the same time a contour is to be milled, which form the counterpart to the in the end faces (2.1) of the pipe connector (2), prefabricated contours that in the order in the axial direction, the first contoured with the contour face (2.1) of the pipe connector ( 2) to the, milled with the counterpart Contoured end face (3.1) of the first pipe section (3) and the opposite, assembled with the contour end face (2.1) of the pipe connector (2) the end face (3.1) milled with the milled as a counterpart contour of the second pipe section (3) in the axial direction into one another, by the interlocking contours self-centering and at the same time ovalisierungsausgleichend are mechanically fixed to put the pipe connector (2) in rotary motion, the mechanically interfitted boundary regions of the contours on the end faces (2.1 and 3.1) to plasticize and by controlling and regulating the rotational speed, the contact pressure and the temperature of the plastication is to be optimized by a quick stop the rotation of the pipe connector (2) the pipe sections (3) via the pipe connector (2) are non-positively welded together and the Klemmvorga After cooling of the weld zone on the pipe sections (3) and the pipe connector (2) is canceled, and that the end faces (2.1 and 3.1) are provided depending on the material thickness, the material and the intended use with contours, in a 45 ° Angle acute-angled centric and eccentric, ie v-shaped, at different acute angles on the pipe sections (3) and ...

Description

The invention relates to a method and apparatus for welding plastic pipes of the same diameter, which are frictionally connected to each other via a rotatable pipe connector by friction welding.

It is known that the connection, in particular of plastic pipes made of the material HDPE takes place either with the mirror welding or the Heizwendelschweißmuffentechnik. In the mirror welding technique, a trench welding machine is used, which must be positioned in the trench and which requires a considerable trench depth and width. The welding process requires a time of at least 30 to 80 minutes depending on the respective nominal pipe diameter, whereby the pipes must not be moved during this time. Due to the long time required for the respective welding process, high costs are incurred due to considerable energy consumption, because of the device blocking an almost total standstill of the laying work, non-utilization of the workforce and thus high time and labor costs. Another undesirable disadvantage of this method is the formation of beads on the inner and outer surfaces of the welds, which may have a height of up to 1 cm. On the inner walls of the pipe, the bead is a flow obstacle for the future medium and in the inliner is also the outer bead a disadvantageous phenomenon, because the beading outside the insertion of the tubes severely hindered and the beads inside must be removed by additional operations with sophisticated robotics. Because of this high labor time and material costs, the actually high-quality HDPE pipe in sewer pipe construction has not yet prevailed. The, for an economic application, necessary longer pipe shots are not applicable because of the usual in the civil engineering Rohrtaktlängen 3-6 m. A further disadvantage is that the trench installation lengths are very short and crossing lines and cables often make the use of larger pipe lengths impossible.

When Heizwendelmuffenschweißverfahren fall to the, approximately similar wage u. Equipment costs such as in mirror welding, also considerable material costs for the purchase of prefabricated Heizwendelmuffen. Therefore, the cost of both of the above methods is about the same. The choice of the connection technology depends essentially on the site conditions and the specification by the client. While the use of the electrofusion method does not produce an internal weld bead, the processing times are somewhat shorter and a cheaper, handy welding machine with less energy consumption can be used. However, the process results in a disadvantageously lower welding factor and in inliner construction it requires a larger space requirement because of the very high-order raised heating coil sleeve, which is why the method is not suitable for inliner technology.

From the DE 37 08 705 A1 a method and apparatus for welding tubular plastic parts is known which is intended to avoid the formation of beads on the welds. The object is achieved in that the parts to be connected are aligned, pushed against each other after the action of heat and thus welded together at the abutting surfaces. For this purpose, the abutting surfaces of the pipe ends to be joined in the direction of the pipe interior are undercut or grooved in such a way that the edge formed by the inner surface of the pipe ends to be joined and the impact surface springs back against the edge formed by the outer surface of the parts and the abutment surface, the parts to be joined softened equally deep in the axial direction, then pushed and thereby welded together. The joint is contacted with a heating element provided with abutment surfaces corresponding to the undercut or fluted joints of the pipe ends. The softened abutment surfaces are pushed together. The heating element is preferably designed as an electrical resistance heater and at the same time allows centering and calibrating the pipe ends. The method and apparatus is not automatically practicable, the construction and procedures are time consuming and costly and complicated and prone to rough handling in trenches on-site in terms of handling requirements.

In the DE 24 08 120 C3 Also disclosed is an apparatus for joining two tubular members by friction welding. Their object is to provide a device with a frame on which a rotatably driven, central chuck is provided, which carries an intermediate piece between the surfaces to be joined of the tubular elements and outer chuck for holding the tubular elements and Axialkraftschubzylinder, with which the tubular Elements with adjustable contact force can be brought into contact with the intermediate piece. The object is achieved by a device in which a Axialschubkraftzylinder between the two tubular elements and another Axialkraftschubzylinder between the frame and the central chuck works, characterized in that the rotatably driven central chuck and the outer chuck are each designed as a total of two-piece assembly whose parts are hinged about an axis parallel to the axis of the chuck. The tensioning organs of the central chuck have drives that work together with centering devices. The clamping members of the central chuck and the outer chuck are designed as self-tightening and self-centering cam grippers. For deburring the welded joints of the tubular elements, one or more, along the axis of the tubular elements, movable tools are provided which have a cutter, a rotary brush and reamers. In a further variant, the central chuck and its actuators and the outer chucks are arranged inside the tubular elements and the intermediate piece and the central chuck deburring tools and a set with a metal brush and Spanabstreifscheiben are provided to deburr the welds outside. For internal deburring a complex robotics is required. The process is a pure and very center-consuming butt welding technique with a complex post-processing.

This device is a complex and complicated construction. It requires large excavation depths because the fixture frame must be installed in the laying trench and stiffened and stabilized with support columns and struts for the apparatus to operate. Another major disadvantage is that the parts to be joined are welded in the warmed-up state to shock with high contact pressure, whereby Schweißwulste arise that must be removed by various, structurally complex Entgratungsvorrichtungen.

Also the DE 21 27 663 B2 discloses a friction welding method in which a, between the end faces of two elements to be welded metal or thermoplastic material, axially movable intermediate member is rotated while the elements are pressed against the intermediate piece, characterized in that directly on the intermediate piece an additional, due to comparative Measurements at the two welds controlled axial force is applied.

The additional axial force is controlled by temperature measurements at the joints in the plasticized state of the boundary areas during the welding process, gradually approached by the pipe section and spacer in the heated state and depending on the different temperature conditions at the seams gradually different and pressed and then cool, before the device can be removed. In a preferred embodiment of the method, the intermediate piece is first brought to its normal rotational speed and only then are the elements to be joined brought together with the intermediate piece. The additional axial pressure according to the invention must be maintained until the welds have cooled.

The device for carrying out the method is permanently installed on a frame and is transported below the pipes to be connected movably in a trench. The assembly of the device requires several workers and a considerable installation effort.

Finally she sees DE 10 2006 026 275 A1 a device for deforming, positioning and processing of pipelines for integration into an underground or water-laid pipeline transport system with at least one clamp, each consisting of several coupled peripheral sections before, the peripheral sections are movable to fully encompass a pipeline against each other. The peripheral sections or their respective two clamps must be closed with a bolt below the pipeline. Laterally, the clamps are coupled according to claim 9, with at least one tool carrier. According to claim 12, the device provides that a welding device and / or a cutting tool, a sawing tool, a chamfering tool, a testing device or a Nachumhüllungsvorrichtung is coupled to at least one tool carrier. The tool carrier requires the circular circulation of the tool around the respective pipe ends or an intermediate piece and the two pipe ends adjacent thereto. A friction welding is not feasible with this device, since the tools must be rotated around the tubes and the intermediate piece. In claim 13 it is provided that the device is held on a mounting frame which is mounted on a vehicle. Although this device allows the deformation, positioning and processing of pipelines, a friction welding would be with the arrangement of one or more tool carrier assembly and time-consuming. The fully encompassing clamping means increase the considerable installation effort with several workers.

From the JP H04-39028 A a method for welding plastic pipes by means of friction welding and an apparatus used for this purpose is known, wherein the end faces of the pipes to be joined ("polyethylene pipes") are bevelled in mirror image to the two end faces of a tubular joint ("tubular joint"), and wherein the pipe connector between the two pipes to be joined is placed. Furthermore, acting on the pipes to be joined and therefore also on the intermediate pipe connecting piece axial forces, which stabilize the three pipe elements in this position. The pipe connector is then by means of the above-mentioned The apparatus is set in rotary motion about its own central axis, whereby friction is produced on the pressed-together end faces of the tubes and of the tube connecting piece, which leads to the fact that the end faces are thus welded.

From the DE 1 073 191 A is already a method and an apparatus for welding pipe sections of thermoplastic materials previously known. The end DE 1 073 191 A Previously known method aims that only two pieces of pipe without pipe spacer, consisting of thermoplastic materials, are welded together by means of a frictional heat generated by torsional vibration.

In the WO94 / 15137 A1 is a sleeve for joining two, consisting of thermoplastic material parts, as well as a method based on said sleeve, as described above. The sleeve and the parts to be joined, for example two tubes, in particular the end faces of the sleeve and the parts to be joined, are provided in predefined forms, which are designed so that the end faces of the tubes and the sleeve can be inserted into one another. After the sleeve has been placed between two parts to be joined, the three components are interconnected by means of frictional heat generated by the rotation of the sleeve.

From the DE 20 2006 003 138 U1 already a welding system for hot-welding plastic pipes is already known. In the prior art welding system only two pipes to be joined can be welded, however, the insertion of a connecting piece between the pipes to be connected is not possible in contrast. Instead of a separate drive to put a pipe center piece in rotation and thus to connect two pipes to be joined by means of frictional heat, has in DE 20 2006 003 138 U1 above-described welding system via a heater for copolar melting of the end faces of the two pipes to be joined. First, the faces are planer planed planed before melting by means of a planer, so that the two pipe ends can be pressed together form-fitting after melting. Also in the DE 20 2006 003 138 U1 However, no Planhobeleinrichtung is provided with the mirror-image contours can be incorporated into the pipe front sides to be connected on site.

It was therefore an object of the invention to develop a method and apparatus for welding plastic pipes of the same diameter, so that they allow a Reibschweißverbindung with individually producible on the site, pipe lengths, pipe spacers, pipe branches and pipe bends, in which no Schweißwulste arise and at the pipes are flush with the wall both inside and outside, that they allow short processing times and largely automated logable workflows without disability or work stoppage, saving wages, equipment, materials and energy and that they are an optimal expense for the excavation of a laying trench or for a ground level installation increase the propulsive power and can be used both in pipeline construction, in pipeline construction and general civil engineering, as well as in workshop and plant construction.

The object is achieved by a method having the features of claim 1.

To emphasize is the inventive method in which an already buried and / or ground-mounted first pipe section, a pipe connector with assembled in opposite faces contours and a second cut pipe section independently in a horizontal axis to grab and held in the end faces of the two axially held pipe sections on both sides and at the same time a contour is to be milled, which form the counterpart to the in the end faces of the pipe connector, prefabricated contours, in order in the axial direction of the first contoured end face of the pipe connector to the, with the counterpart milled contour provided end face of the first pipe section and the opposite, assembled with the contour end face of Rohrwerbindungsstücks the end face with, milled as a counterpart contour of the second pipe section in axial direction aligned to each other by the interlocking contours self-centering and at the same time ovalisierungsausgleichend are mechanically fixed, and that to put the pipe connector in rotary motion, the mechanically merged boundary regions of the contours on the faces to heat plasticizing, by controlling and regulating the Rotation speed, the contact pressure and the temperature to optimize the plasticization is to be welded together by a quick stop of the rotation of the pipe sections on the pipe fitting frictionally and the gripping operation on the pipe sections and the pipe connector after cooling of the weld zones is to lift.

Of particular importance is the inventively provided milling the different contours.

The contours and contours, depending on the material thickness, the material and the intended use, at an acute angle Centric and eccentric, in different acute angles on the pipe sections and the pipe connector centric and eccentric, with and without Schweißgut- Vorratsfase on the outer edges of the pipe sections, centric frusto-conical and mirror image, centric and eccentric wavy with and without Schweißgut-Vorratsfase on the pipe sections and circular segment are to be arranged with symmetrical and asymmetrical radius and with and without Schweißgut-Vorratsfase at the end faces of the pipe ends and Rohrwerbindungsstücks, serve when merging the pipe sections with the pipe connector of the mechanical centering and ovalization compensation of the pipe ends before the welding process. Moreover, in the welding operation with the various shapes of contours on the end faces, the heat generation and the centrifugal expulsion of the plasticized material components in the boundary regions of the parts to be joined is better controlled. For example, with an eccentric acute-angled contour, heat is generated first in the eccentric tip and then continuously outward and inward, and the plasticized material is propelled outward by the centrifugal force over the longer path. By the contours resulting larger run lengths, which lead to an enlargement of the weld contact surface and the friction surface. In this way, the material is not pushed beyond the tube outer circumference and inner circumference and no weld bead is produced. Also, at the outer edges of the pipe sections milled weld stock chamfers can absorb the expelled plasticized material and thus prevent the formation of weld beads.

Each of the selected contours has a shape characteristic which ensures mechanical self-centering and ovalization compensation at the tube ends prior to the welding operation and the prevention of internal and external weld beads during the friction welding process. Subsequent and expensive milling work to eliminate annoying inner and outer beads on the welds omitted, the device structure simplifies. The mechanical interlocking of the contours saves complex centering devices, which make the device structurally complicated and require a higher material, time and cost.

Particularly noteworthy is the apparatus for performing the method according to claim 3, which is equipped as an attachment for mobile and / or stationary machines with lifting function and with Eletro- and hydraulic connection, has a corresponding connector, which have three gripping devices, each with two partially gripping jaws and fully automatic. Is SPC controlled and therefore is to be used inside and outside a trench. The device can thus be lowered within or outside a laying trench to the workplace and automatically reach and hold the aligned pipe sections and therebetween a pipe connector with prefabricated contours on the end faces, by means of a plurality of independently operable gripping devices.

Particularly advantageous is the gripping device for the pipe connector, which is equipped with a, on both sides and peripherally, independently of the gripping means of the pipe sections, vertically raised and lowered in the work area, milling device. This is to move out of the work area after completion of the milling work, without having to solve the gripping means of the pipe sections and the pipe connector. The milling process can be repeated as desired.

With the invention provided for milling device various contours can be attached to the faces of the pipe sections to be connected on site and with a, arranged on the milling device, separate drive, the rotation of the pipe connector with the prefabricated end surfaces generated and regulated and between two pipe sections and the Pipe fitting a friction welding can be performed.

The lifting function as well as the power and hydraulic supply of a mobile or stationary machine, such as an excavator, are so used for the control of the device, in which they are easy to couple with the mobile or stationary machine and fully automatic. SPC controlled to operate within or outside a laying trench. This has the advantage that the device, which consists essentially of an assembly, does not have to be self-erected and anchored, no additional labor to attach the device to the pipe sections and the pipe connector are required and no additional energy and hydraulic sources are needed.

The connecting pieces can be assembled before installation and the pipe pieces according to required installation lengths. Channel holding lengths and cut in disabling line crossings regardless of delivery lengths on site and their faces are processed with the milling device according to the invention on site.

The device can be lifted after the welding process from the laying trench or from the ground-level work place, the workers can without prolonged work disability or even standstill the next excavation or Carry out the installation stroke, position the next pipe fitting and the next pipe piece and repeat the welding procedure as described. There are considerable time savings and shortening of tunneling times.

The basic structural design of the device according to claim 4 and 5 is particularly simple, to the effect that at least four perpendicularly arranged along a longitudinal edge along a longitudinal edge frictionally arranged parallel spaced bearing elements and at the opposite longitudinal edge at least four parallel spaced bearing elements are arranged in the free Ends each a continuous support shaft is mounted. In this case, a cylinder for axial movement of the gripping means is arranged on the support shaft between the two parallel Teilumgreifenden jaws of the gripping devices for the pipe sections and the terminal device has between the first support shaft and the second support shaft at the bearing points of the parallel teilumgreifenden clamping jaws, transverse to the advancing direction, respectively a clamping cylinder for opening and closing the gripping means.

It should also be emphasized that essentially only one central support shaft is required to accommodate all the essential parts of the device, via which the axial displacement of the gripping devices, the independent gripping functions, the rotational movement for the friction welding process and the operation of the milling device on both sides of the gripping device for the pipe connector, are feasible. This allows a structurally simple, easy-to-use and cost-effective device.

Of course, the method and the device both in piping and general civil engineering, as well as in pipeline construction and workshop and plant construction can be used.

The invention is described below with reference to an embodiment. The drawings show in

1 Side view of a laying trench,

2 the front view of the attachment,

3 the side view of 2 .

4 a sectional view through a junction of a Reibschweißverbindung between two pipe sections via a pipe connector.

5 the presentation of a selection of side views of possible contour shapes,
the same parts are marked with the same numbers.

1 shows the side view of a basic representation of the process sequence according to the invention in a laying trench. In the laying trench is a piece of pipe 3 already laid and buried, in the distance is in the axial direction of a pipe connector 2 and then a new piece of pipe to be laid 3 to recognize. In the advancing direction is outside the trench, on the not yet excavated soil, such as a conventional excavator on which a device according to the invention 1 , in the form of an attachment, coupled and lowered into the laying trench. The device 1 is connected to the energy and hydraulic supply of the excavator and fully automatic with SPC control by means of a gripping device 5 the already buried pipe section 3 with a middle gripping device 4 the pipe connector 2 and with the third gripping device 5 the new piece of pipe to be laid 3 independently of each other. The pipe connector 2 is on both ends 2.1 preferably with a contour, according to 4 , made to fit into the ditch before insertion. The middle gripping device 4 is with a, not shown in the drawings, on both sides and circumferentially, can be raised and lowered in the radial direction milling device 4.1 and a drive 4.2 fitted. The milling device 4.1 is now working at the front ends 3.1 the two pipe sections 3 lowered and milled the mating contours to those of the pipe connector 2 in the frontal areas 3.1 the pipe pieces 3 one. Then the milling device 4.1 back out of the work area without the gripping devices 4 and 5 to have to solve. Now you can with the help of an axially movable cylinder 6 that between the clamps 5.1 the gripping device 5 is arranged, the end face 3.1 of the newly laid pipe section 3 to one of the faces 2.1 of the pipe connector 2 and the second end face 2.1 of the pipe connector 2 to the face 3.1 of the already buried pipe section 3 be merged in the axial direction. The prefabricated contours of the pipe connector grip 2 on both sides in the fresh milled counter contours of the pipe sections 3 initially mechanically, the pipe sections 3 and the pipe connector 2 are centered in alignment, engage in each other in an ovalization-compensating manner and are held together mechanically with a controlled contact pressure. Now with the help of the drive 4.2 the gripping device 4 the pipe connector 2 set in rotation, with the boundary areas of the faces 2.1 and 3.1 uniformly heated on both sides, plasticized and non-positively welded together by friction welding. After a short cooling time, the welded composite has cooled and stabilized so far that the device 1 can be detached from the pipe assembly with the help of the excavator and lifted out of the laying trench. The workers can make the new excavation stroke in the direction of advance, a new pre-assembled pipe connector 2 and another piece of pipe 3 in the laying trench and the welding process can be repeated as described. Of course, this procedure is also applicable at ground level, for example when laying a pipeline or in stationary workshop and plant construction.

2 and 3 show the principal front and side view of the device according to the invention 1 as an attachment, for example, for an excavator. The device 1 has a connection part 1.1 with along its one longitudinal edge, for example, four rectangular and parallel spaced, non-positively arranged bearing elements 1.2 and along its opposite longitudinal edge four parallel spaced bearing elements 1.3 on. In the free ends of the bearing elements 1.2 is a holding wave 1.4 and in the ends of the bearing elements 1.3 a support shaft 1.5 stored in a conventional manner. On the support shaft 1.4 are preferably a gripping device in the order 5 with two jaws 5.1 , a gripping device 4 preferably with two jaws 4.3 and a second gripping device 5 with two jaws 5.1 and between the jaws 5.1 for example, in each case an axially movable cylinder 6 stored. Between the two support shafts 1.4 is at the bearings of the jaws 5.1 and opposite to the support shaft 1.5 transverse to the direction of advance in each case a clamping cylinder 7 arranged, which is the gripping function of the jaws 5.1 the gripping devices 5 guaranteed. At the gripping device 4 is a, not shown in the drawings, on both sides and peripherally, radially raised and lowered, milling device 4.1 arranged, with the help of which the end faces 3.1 the two, to be welded together pipe sections 3 be provided with a counter contour and a pipe connector 2 with end faces 2.1 can be welded with prefabricated contours. In addition, the gripping device has 4 via a drive 4.2 with which the rotation of the pipe connector 2 to perform and regulate for the friction welding process.

In 4 the section is represented by a welded joint with a preferred contour. However, there are other contour features, such as in 5 shown applicable.

LIST OF REFERENCE NUMBERS

1

Device in the form of an attachment,

1.1

Connector,

1.2

Bearing elements,

1.3

Bearing elements,

1.4

Holding shaft,

1.5

Holding shaft,

2

prefabricated pipe connector,

2.1

Faces,

3

Pipe section,

4

middle gripping device,

4.1

milling device,

4.2

Drive,

4.3

Jaws

5

right and left gripping device,

5.1

Jaws

5.2

annular pressure surfaces,

6

axially displaceable cylinders,

7

clamp cylinders

Claims (5)

Method for welding plastic pipes of the same diameter, in which a rotatable pipe connector ( 2 ) by friction welding two pieces of pipe ( 3 ) are positively connected to each other, characterized in that an already buried and / or ground-mounted first tube piece ( 3 ), a pipe connector ( 2 ) with, in opposite end faces ( 2.1 ) prefabricated contours and a second cut piece of pipe ( 3 ) are independent of each other in a horizontal axis to grip and hold that in the end faces ( 3.1 ) of the two axially held pipe pieces ( 3 ) on both sides and at the same time a contour is milled, which is the counterpart to the in the end surfaces ( 2.1 ) of the pipe connector ( 2 ), prefabricated contours form, that in the order in the axial direction, the first contoured with the contour face ( 2.1 ) of the pipe connector ( 2 ) to the, provided with the counter-milled contour contour face ( 3.1 ) of the first pipe section ( 3 ) and the opposite, with the contour assembled end face ( 2.1 ) of the pipe connector ( 2 ) the end face ( 3.1 ) with the counter-milled contour of the second pipe section ( 3 ) in the axial direction to each other in the axial direction, are self-centering by the interlocking contours and simultaneously ovalisierungsausgleichend mechanically connect that the pipe connector ( 2 ) to set in rotation, the mechanically merged boundary regions of the contours on the end faces ( 2.1 and 3.1 ) to heat to plasticizing and by controlling and regulating the speed of rotation, the contact pressure and the temperature Plasticization is to be optimized, whereby by a quick stop the rotation of the pipe connector ( 2 ) the pipe pieces ( 3 ) via the pipe connector ( 2 ) are non-positively welded together and the clamping operation after cooling of the weld zone on the pipe sections ( 3 ) and the pipe connector ( 2 ) and that the faces ( 2.1 and 3.1 ) are to be provided with contours depending on the material thickness, the material and the intended use, which at an acute angle at an acute angle centric and eccentric, ie v-shaped, at different acute angles on the pipe sections ( 3 ) and the pipe connector ( 2 ) Centric and eccentric, that is substantially V-shaped, centric and eccentric undulating with and without Schweißgut-Vorratsfase on the pipe sections ( 3 ) as well as circular segment with symmetrical and asymmetrical radius and with and without weld material Vorratsfase are executed, which in a short time a uniform axial and radial heating and plasticization of the boundary areas and a bead-free weld are to be produced. Method for welding plastic pipes of the same diameter, according to claim 1, characterized in that instead of the pipe connector ( 2 ) a branch pipe branch is used. Contraption ( 1 ) for carrying out the method according to claim 1 or 2, which device ( 1 ) several gripping devices ( 4 and 5 ) with two parallel jaws ( 4.3 and 5.1 ), a plurality of cylinders to be displaced in the axial direction ( 6 ) and several clamping cylinders ( 7 ), characterized in that the device ( 1 ) is designed as an attachment for mobile and / or stationary machines with lifting function and with electrical and hydraulic connection, via a connecting part ( 1.1 ), the three gripping devices ( 4 and 5 ) and in each case two teilumgreifende jaws ( 4.3 and 5.1 ) and the device ( 1 ) is fully automatic, SPC-controlled and to use inside and outside a laying trench, that the gripping device ( 4 ) of the device ( 1 ) with a double-sided, independent of the gripping devices ( 4 and 5 ), vertically in the work area raised and lowered milling device ( 4.1 ), the milling device ( 4.1 ) is to be moved out of the working area after completion of the milling operations, without the gripping devices ( 4 and 5 ) and that the process must be repeated arbitrarily, and that with the milling device ( 4.1 ) various contours on end faces ( 3.1 ) to be connected pipe pieces ( 3 ) and with one at the milling device ( 4.1 ), separate drive ( 4.2 ) the rotation of the pipe connector ( 2 ) with the prefabricated end faces ( 2.1 ) and between two pipe sections ( 3 ) a friction welding is to be performed. Apparatus according to claim 3, characterized in that the connecting part ( 1.1 ) at least four at right angles along the longitudinal edge frictionally arranged parallel spaced bearing elements ( 1.2 ) and at the opposite longitudinal edge at least four mutually parallel spaced bearing elements ( 1.3 ), in whose free ends in each case a continuous support shaft ( 1.4 ) and ( 1.5 ) is stored. Apparatus according to claim 4, characterized in that on the support shaft ( 1.4 ) between the two parallel Teilumgreifenden clamping jaws ( 5.1 ) of the gripping devices ( 5 ) a cylinder ( 6 ) for the axial movement of the gripping devices ( 5 ) and for generating the contact pressure is arranged and the terminal device ( 1.1 ) between the support shaft ( 1.4 ) and the support shaft ( 1.5 ) at the bearing points of the parallel partially gripping jaws ( 5.1 ), transversely to the direction of advance, in each case one of the clamping cylinders ( 7 ) for opening and closing the gripping devices ( 5 ) having.

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