EP2864068A1

EP2864068A1 - Device and method for bending pipes for pipelines

Info

Publication number: EP2864068A1
Application number: EP13729265.2A
Authority: EP
Inventors: Oliver Baum
Original assignee: Isobend GmbH
Current assignee: Maats Beheer Bv
Priority date: 2012-06-20
Filing date: 2013-06-14
Publication date: 2015-04-29
Anticipated expiration: 2033-06-14
Also published as: US10441987B2; CA2883031A1; EP2864068B1; RU2015101329A; WO2013189582A1; RU2617464C2; US20150266075A1; DE102012012139A1; DE102012012139B4; CA2883031C

Abstract

The invention relates to a device for bending pipes (100), in particular coated pipes, preferably insulated pipes and/or pipes which are coated with PU foam/PU hard foam, for pipes having a base body (11) which can be positioned in the pipe and on which a running gear (12) is provided for displacement inside the pipe, and at least three contact elements (13, 14, 15) for establishing a contact to an inner wall (102) of the pipe for introducing a bending force, wherein at least two contact elements are provided on one side (16) of the base body on the ends of the base body, and at least one contact element is arranged on the opposite side (17) of the base body, and wherein at least one of the contact elements opposite of the base body is provided movably via a force introduction element (23) in the direction (A) of the inner wall of the pipe. The invention further relates to a method for bending such pipes.

Description

Apparatus and method for bending pipes for pipelines Description

The invention relates to apparatus for bending pipes, in particular of coated pipes, preferably insulated and / or coated with PU foam / rigid polyurethane foam pipes for pipes with a positionable in the tube body, on which a chassis is provided for the process in the pipe and at least three contact elements for making contact with an inner wall of the pipe for introducing a bending force, wherein at least two contact elements are provided on one side of the base body at the ends of the base body, and at least one contact element is arranged on the opposite side of the base body, and wherein at least one of the contact elements is provided relative to the base body via a force introduction element movable in the direction of the inner wall of the tube. Furthermore, the invention relates to a method for bending such pipes. These pipes are used in pipelines such as pipelines that carry large volumes of liquids or gases over long distances. The transported media include oil, chemicals and / or drinking water. Pipelines exist throughout the world for carrying both liquid and gaseous substances over long distances. These pipelines are generally composed of sections of individual tubes with lengths of 12 to 18 meters. The tubes usually have a diameter of 4 to well over 75 inches and are welded together to form a pipeline on the earth's surface, buried underground and / or in the water. Often the pipelines follow the general contour of the earth's surface. The course of the piping can be particularly in its horizontal and vertical

CONFIRMATION COPY Extension also be diverted or guided around obstacles in any other way.

A major challenge in the design and construction of such piping is to add the ends of each pipe to high quality welded joints. In order to follow the contour of the earth's surface and to avoid any obstacles in the course of the pipelines, changes of direction in the pipeline are necessary. When creating the direction changes, attempts are largely made to dispense with welded joints. Directional changes in pipelines can be produced by welding individual pipe sections, especially for pipes with a large diameter. In order to minimize the number of welded joints and thus increase the reliability of the pipelines, the change of direction in the pipe must be created by bending the pipe.

As is usual with large diameter pipes, a bend is achieved by making numerous small, arranged bending steps in the pipe. The desired bending radius is thus generated in the form of a polygon. In such a bending system, the operator has complete control over the number of incremental and / or incremental bends to be made, the distance between the incremental and / or incremental bends, and the extent of each incremental and / or incremental bend in the tube. Experienced operators can efficiently control the tube benders to produce precise bends in the tubes while minimizing the number of damaged or incorrectly bent tubes resulting in a waste of time and resources such as energy and tubes.

After each bending operation, the tube and bending device must be moved relative to each other with high precision. In this case, both a movement of the tube in the bending device and a movement of the bending device itself is possible. The latter variant has the disadvantage that the tube must be aligned again in the bending device. Moving the pipes with large diameter, the precise movement of the dome and the control of the Bending generated are associated with a high manpower and energy requirements.

Due to the size of the tubes to be bent, flexures are generally massive in nature and hydraulically operated. A bending device is generally known from US 3,834,210 and US 5,092,150. Such flexures have means for gripping the tube, moving the tube in the flexure, and creating the bend in the tube. These devices are all hydraulically operated under the control of an operator.

Document DE 600 28 484 T2 shows a conventional bending device adapted for producing bends in a large diameter pipe. The flexure generally includes a reinforced frame to which the components are anchored against relative movement. The main components of the tube bending device include a bending tool, a mandrel, also called mandrel, a support device and a fastening shoe. The bending tool is a solid body stationary with respect to the frame and having a curved surface facing the tube, the bending tool being pressed against the tube during the bending operation. The support device is actuated during the bending process by a hydraulic pressure and pivoted in the direction of the bending tool. Meanwhile, the attachment shoe fixes the tube. In the work areas of the bending device forces are transmitted to the pipe during the bending operation by means of the bending tool, the support means and the attachment shoe, so that this deformed. The mandrel is a rigid, limbed construction that allows the pipe to be bent without altering the circular nature of the pipe at the bend. Such mandrels are known in the art.

As already shown in the above-mentioned bending device, bending devices usually have three working areas in which the forces required for bending the tube are transferred to the tube. During the bending process, an active force is introduced by means of a working area a hydraulic cylinder. The remaining passive work areas serve as abutments and are connected to the active workspace via the frame. DE 696 03 499 T2 shows a bending device in which the middle of the three working areas is designed as an active working area.

To bend such large diameter pipes, great forces must be applied. Correspondingly large and solid, the necessary bending devices and the mandrel must be executed. The equipment required for the use of such large benders, such as diesel engines, hydraulic pumps and mandrels, is also of high volume and mass. Overall, it should be noted that the operation of such bending devices during transport and on site places high demands on space requirements. The high costs of logistics are compounded by the costs of consumables, especially fuels and energy sources.

Reducing the workload is also known from DE 600 28 484 T2 a method for automating a bending device and a controller with a programmable processor. Just to perform incremental and / or incremental bends with a high degree of repeatability and accuracy, automation is required. With a higher quality, the duration of the entire bending process should be reduced and at the same time the transport weight and the energy requirement of the bending device should be reduced. An input mentioned device and a corresponding method are known from DE 10 2008 060 897. Here, a bending device is provided which is completely positionable at least with its essential for the function of the bending machine parts in the interior of the tube to be bent. This makes it possible that the bending device applies the forces necessary for bending the tube from the inside to the pipe. This makes it possible on the one hand to dispense with a mandrel and / or mandrel, since the bending device itself at the same time supports the inner shape of the tube and generates the bend in the tube. This leads to a low workload and low energy consumption. Furthermore, damage to an outside of the pipe applied coating, such as a paint, insulation and / or synthetic resin reinforcement, principle conditionally avoided.

From JP 58138523 A, a bending device is also known, which performs the bend in the interior of the pipeline. It has 2 active work areas (front and back), whereas the middle work area is passive. Here the exact introduction of force to both separate work areas is disadvantageous. It is favorable, which also applies to the following inventive solution, that at least three contact elements are provided on the support of the bending device, wherein two contact elements on a first side of the carrier at the ends of the carrier and a contact element on one of the first side opposite second side of the carrier are arranged in the middle of the carrier. This makes it possible that the bending device is movable like a rocker within the tube. Moreover, it is favorable that the contact elements on the inner surface of the tube are in particular form-fitting applied. This makes it possible that the bending device adapts to the initiation of the forces necessary for bending in the tube of the inner surface of the tube and thus damage to the tube is avoided. The contact elements are also made according to a teaching of the invention of a type of rubber, hardwood, an aluminum alloy and / or a plastic having a suitable Shore hardness. This device is in need of improvement in terms of bending accuracy, especially with respect to coated tubes.

The invention is based on the object to provide a bending device can be bent with the coated tube with a higher accuracy.

With regard to the device, the object of the invention is achieved in a first solution in that the force introduction element is arranged substantially horizontally, so that a horizontal force is applied, and a diverting element is provided, which is embodied such that the horizontally introduced force results in a substantially vertical movement of the contact element towards the inner wall of the pipeline. In this way, the necessary force introduction can be optimized and it is possible to perform the bending more precisely in this way.

A further teaching of this solution provides that the chassis is arranged on the base body such that the base body is rotatable relative to the chassis and that the direction of rotation is substantially at right angles with respect to the direction of travel. In this way, the necessary alignment of the device in the tube can be optimized and it is possible to perform the bending more precisely in this way. It becomes possible to align the device with respect to gravity, whereby driveability deviations are compensated, making it possible to bend exactly in one plane.

Another teaching of the invention provides that the second contact element relative to the base body via a force introduction element is provided movable in the direction of the inner wall of the tube and that on the opposite side to the second contact element on the base body another contact element is provided, preferably in one piece out with the opposite Contact element, which particularly preferably extends to the end of the base body, on which the second contact element is arranged. It has been found that such an arrangement leads to a particularly precise bending of the pipeline.

With regard to the device, the object of the invention is achieved in a second solution in that the chassis is arranged on the base body, that the main body is rotatable relative to the chassis and that the direction of rotation takes place substantially at right angles with respect to the direction of travel. In this way, the necessary alignment of the device in the tube can be optimized and it is possible to perform the bending more precisely in this way. Another teaching of this solution provides that the force introduction element is arranged substantially horizontally, so that a horizontal force introduction takes place, and that at least one Wegumleitungselement is provided at one end of the Krafteileitungselements, which is designed so that the horizontally introduced force a substantially vertical movement of the contact element towards the inner wall of the pipeline takes place. In this way, the necessary force introduction can be optimized and it is possible to perform the bending more precisely in this way.

With regard to the device, the object according to the invention is achieved in a third solution in that the second contact element is provided movable relative to the main body via a force introduction element in the direction of the inner wall of the tube and that provided on the opposite side to the second contact element on the main body another contact element is.

This makes it possible to optimally align the device in the tube with respect to the desired bending angle and lock and then perform the bending step optimized with the first contact element. Another teaching of the invention provides that the second movable contact element opposite contact element is integral with the opposite contact element that preferably extends to the end of the base body on which the second contact element is arranged.

A further advantage is that the force introduction element is arranged substantially horizontally, so that a horizontal force introduction takes place, and that at least one Wegumleitungselement is provided at one end of the Krafteileitungselements, which is designed so that the horizontal force introduced a substantially vertical movement of the contact element towards the inner wall of the pipeline. In this way, the necessary force introduction can be optimized and it is possible to perform the bending more precisely in this way.

Another teaching of the invention provides that the chassis is arranged on the base body, that the base body is rotatable relative to the chassis and that the direction of rotation is substantially at right angles with respect to the direction of travel. In this way, the necessary alignment of the device in the tube can be optimized and it is possible to perform the bending more precisely in this way.

The following advantageous teachings represent advantageous embodiments of all three solutions of the object according to the invention.

A further teaching of the invention provides that the Wegumleitungselement has a wedge-shaped element and a corresponding to the movable contact element to the wedge-shaped element, which is arranged movably on the wedge-shaped element. As a result, the introduction of force can be carried out horizontally, whereby a structurally larger force introduction element with a larger lifting height can be used with a smaller diameter, while at the same time the necessary precision for the introduction of force is available. The provision of the wedge-shaped element as part of the Wegumleitungselements provides a particularly simple, but effective embodiment. Furthermore, the transmittable force is increased according to the wedge angle by the wedge-shaped element.

A further teaching of the invention provides that the movable contact element is movably connected to the main body via a connecting element, preferably a cantilever or a steel cable, which is pivoted on the contact element, and preferably the connecting element is pivotably connected to the main body, and / or in that at least one return element, preferably a spring element, is provided between the movable contact element and the base body. By the return element, the overall construction of the device is simplified because the force application element has to transmit force in one direction only.

A further teaching of the invention provides that at one of the Wegumleitungselement opposite side of the force introduction element respectively on the force application element and corresponding to the main body each a pressing surface as an abutment for introduction of force line is present, which are in the introduction of force in contact, and / or it is the force introduction element is a hydraulic cylinder.

With respect to the hydraulic cylinder, it is advantageously possible that the necessary forces generated by a hydraulic pump outside or inside the pipe and are guided by means of pipe and / or hose lines to exposed contact surfaces to the forces there by means of space-saving to be arranged hydraulic cylinder on the pipe transferred to. In this case, the number of hydraulic cylinders can be selected according to the forces required for bending. It is particularly useful to arrange the hydraulic cylinders at one and / or at both ends of the carrier, since a large bending moment can thus be generated by means of the long lever arm of the bending device with relatively small forces.

Another teaching of the invention provides that the chassis has a chassis base body which is rotatable relative to the base body, and / or that the chassis has a front and a rear chassis and the axes of rotation of the chassis of the trolleys are coaxial, wherein preferably the axis of rotation is arranged so that it is located above the center of gravity of the device and / or the chassis. A further teaching of the invention provides that the chassis has a drive body having wheels for advancing the device in the tube and which is movable relative to the chassis base body to the axis of rotation of the chassis main body, preferably via at least one hydraulic cylinder. By lifting the wheels required for the upturning of the tube space is created in a particularly simple manner.

It is advantageous that the contact elements have a suspension formed in particular as a leaf spring. This makes it possible to apply the contact elements damped to the pipe. It is also possible that the contact elements adapt to the surface geometry of the tube, which leads to a secure hold of the bending device and protects the material of the tube. It is particularly favorable that the bending device and / or at least one contact element in the geometry of a bending angle to be generated by means of the bending device and / or bending radius of the tube is configured. This makes it possible that the region of the tube to be bent rests against the work area, whereby warping, folds or other undesired deformations of the tube can be avoided. This work area is preformed according to the geometry of the bend to be created. It is advantageous that the bending device has a convex geometry in its longitudinal extent. This makes it possible that the bending device can move in the curved tube. The geometric design of the bending device depends on the diameter of the pipe after the minimum allowable bending radius for large pipes.

With regard to the method, the object according to the invention is achieved by a method for bending pipes, in particular coated pipes, preferably insulated and / or with PU foam, for pipelines comprising the steps of: locally locking a first end of the pipe to be bent, movably supporting an opposite end of the pipe to be bent, retracting a bending device, preferably according to a previously described device into an interior of the pipe to be bent, passing through the pipe with the bending device. Arranging the bending device at the first bending point, lifting the chassis, detecting the current bending angle of the pipe, activating the force introduction element, extending the movable contact element against the pipe inner wall, continuing the movement of the contact element against the pipe wall to the bending angle necessary bending point, retraction of the contact element, extending of the landing gear, moving to the next bending point, repeating the bending.

Another teaching of the invention provides that after lifting the further located in the chassis running the downwardly facing contact element is seated on the tube inner wall and the second movably running contact element is extended against the pipe inner wall, so that the bending device is wedged in the tube on one side. Another teaching of the invention provides that while driving through the tube, the path is taken, preferably by angular momentum of the wheels of the chassis or by cable pull sensor as a distance measurement between the bending device and the pipe end on the retraction side, and / or that during lowering of the front Undercarriage the distance to the pipe inner wall is monitored, and / or that the necessary bending angle is made up of the bending angle to be achieved at the point of bending and an angle resulting from the elasticity of the pipe to be bent,

A further teaching of the invention provides that the main body of the bending device is aligned against the force of gravity at the respective bending location.

The invention will be explained in more detail with reference to several embodiments with reference to a drawing. Show 1 is a perspective view of a first embodiment of a device according to the invention,

2 is an alternative view to Fig. 1,

3 is a partially sectioned view of Fig. 1,

4 is a longitudinal sectional view of FIG. 1,

5 is a detail view of the front chassis to Fig. 1st

6 is a perspective view of a second embodiment of a device according to the invention,

7 is a detail view of FIG. 6 with extended contact element,

8 is a longitudinal sectional view of FIG. 6,

9 is a detail view of the front chassis to Fig. 6,

10 shows a bending process with a device according to FIG. 6, FIG.

Fig. H is a perspective view of a third embodiment of a device according to the invention, and

12 is a longitudinal sectional view of FIG. 11th

1 to 5 show a first embodiment of a bending device 10 according to the invention. The bending device 10 has a main body 11, at the front and rear end of which a chassis 12 is arranged in each case. On the upper side 16 of the main body 11, two contact elements 13, 14 are provided. The underside 17 of the main body 11 has a bend 18. At the bottom 17, a contact element 15 is centrally provided. The contact element 13 is shown movable in the direction of movement A. In order to carry out this movement, the contact element has a cantilever 19, which connects the contact element 13 via a pivot point 20 with the main body 11. The boom 19 is connected via a second pivot point 21. Below the contact element 13, a Wegumleitungselement 22 is provided, which is connected to a force introduction element 23. The force introduction element 23 is a hydraulic cylinder. The hydraulic cylinder 23 has a piston rod 24. This is connected at its side remote from the cylinder chamber 25 side via a pin connection 26 with a wedge 27. The wedge 27 has a wedge surface 28 on which a second wedge 29 is movably arranged. The wedge 29 is rotatably connected to a carrier 30, on which the contact element 13 is arranged. In the interior of the base body 11, a base 32 is arranged. The hydraulic cylinder 23 has a lower cylindrical eye 33. This is connected via a pin connection 34 with the base body 11. The cylindrical eye 33 has an outer surface 35. The base 32 has a corresponding inner surface 36. Between the pin connection 34 and the cylinder eye 33, there is play that when the hydraulic cylinder 23 is extended, the force on the side facing away from the contact cylinder 13 of the hydraulic cylinder 23 is transmitted via the outer surface 35 on the inner surface 36 of the base 32. The contact element 14 and the contact element 15 are each fixed, but changeable, arranged on the base body 11.

The chassis 12 is designed in this embodiment as follows. On the end face 37 of the base body 11, a receiving element 38 is arranged. On the receiving element 38, a pivoting element 39 is rotatably mounted. On the pivoting element 39, a pendulum element 40 is rotatably arranged. Within the pendulum element 40, a hydraulic motor 41 is arranged, which is connected via drive pinion 42 with a drive shaft 43. The drive shaft 43 is in communication with the drive wheels 44. About the drive wheels 44, the bending device 10 is moved in and out of the tube. Via the pivoting element 39, it is possible to raise the chassis 12 so that the contact element 15 comes into contact with the inner wall 102 of the tube 100 and the drive wheels 44 disengage from the inner wall 102 of the tube 100. FIGS. 6 to 9 show a second embodiment of the bending device 10 according to the invention. On the base body 11, a chassis 12 is arranged at each of the front and rear ends. At the top 16 are each at the front and rear ends of a contact element 13 and a contact element 14. On the bottom 17, a contact element 15 is centrally located. In the front portion of the chassis 12, the bottom 17 has a bend 18. The front contact element 13 and the rear contact element 14 are connected to each other via two cables 45 as Wegbegrenzer and leadership. The structure of the Wegumleitungselements 22 and the force introduction element 23 corresponds to the first embodiment. As shown in Fig. 7, this is Contact element 13 via spring elements 46 additionally connected to the base body 11. The spring elements 46 serve to convey the contact element 13 back to its starting position when the hydraulic cylinder 23 is retracted. The front chassis 12 has an axis 47 which is arranged in the longitudinal direction of the main body 11 on the end face 37 of the base body 11. To the axis 47, rotatably mounted, a sleeve 48 is arranged. Fixed to the sleeve 48, a support member 49 is arranged. On support element 49, a pendulum element 50 is arranged via arm 51. The pendulum element 50 has a receptacle 52 for wheels 53. Via hydraulic cylinders 54, which are connected to the carrier element 49 and the shuttle 50, it is possible to raise the shuttle 50 so that the wheels 53 are moved away from the inner wall of the tube, whereby the lower contact element 15 lies on the inner wall of the tube comes. In order to have sufficient bending space, the pendulum elements 50 are raised so far about the hydraulic cylinder 54, so that a sufficient distance between the chassis 12 and tube inner wall 102 is formed, so that the tube 100 can be bent according to the desired bending angle upwards.

In Fig. 10, the use of the bending process 10 according to the second embodiment when bending a tube 100 is shown. The tube 100 is composed of a pipeline tube 103 and a coating 101, for example made of rigid polyurethane foam. The bending device 10 is retracted into the tube 100. Shown is an already bent portion 104 of the pipe 100. The chassis 12 of the bending device 10 is retracted so that the contact element 15 with the inner wall 102 of the piping 103 is in contact. the contact element 13 is extended via the hydraulic cylinder 23 and Wegumleitungselement 22, in which the wedge 27 is bewegetegeted by the piston rod 24 of the hydraulic cylinder while the wedge 29 on the wedge surface 28 of the wedge 27 is moved upward until the contact element 13 with the Inner wall 102 comes into contact. By continuing to move the piston rod 24, the contact element 13 is then pressed against the inner wall 102 of the tube 100 and the pipeline tube 103 of the tube 100 undergoes a bend. To make this bend permanent, the elastic deformation of the tube must first be overcome. Subsequently, a plastic deformation of the Pipe instead, so that a corresponding deformation is performed. After completion of the bending step, when the corresponding bending angle has been reached, the piston rod 24 is retracted via the hydraulic cylinder, whereby the wedge 29 can move from the wedge surface 28 down. Since the contact surface 13 is prevented via the cables 45 at a movement other than back into the main body 11, the contact element 13 is brought back into its basic position via the spring elements 46. The elastic portion of the bending process is detected and taken into account in the control of bending for accuracy.

Subsequently, the chassis 12 is extended again and the bending device 10 can be moved out of the pipe until the next bending location, in which then the next bending increment can be carried out accordingly.

A third embodiment of a bending device 10 according to the invention is shown in FIGS. 11 and 12. On the base body 11, landing gears 12 are arranged on both sides, which have a structure of the chassis part 12 of the second embodiment, which is located in the region of the contact element 13. The contact element 13 is in turn movably arranged via a corresponding diverting element 22 and a force introduction element 23. Between the contact element 13 and the base body 11 guide arm 55 are arranged. The lower contact element 15 extends along a straight portion of the main body 11 from the beginning of the bent portion of the base body 11 toward the end of the main body 11, on which the contact element 14 is arranged. The contact element 15 is fixedly arranged on the underside 17 over the entire length of the straight portion. In this embodiment, the contact element 14 in the direction of movement C from the base body 11 is movable away. Provided for this purpose is a hydraulic cylinder 56, which is connected to a sliding element 57, are arranged on the wedges 58. The contact element 14 is arranged on a carrier element 59. At the bottom of the support member 59 wedges 60 are arranged, which are arranged on a wedge surface 61 of the wedges 58 slidably. If the hydraulic cylinder 56 is extended, the wedges 58 are moved relative to the wedges 60, so that the wedges 60 are displaced on the wedge surfaces 61 in the direction of movement C, so that the contact element 14 is moved against the inner wall 102 of the tube 100. The Rausfahren of the contact element 14 takes place until a contact with the inner wall 102 takes place. Thereby, the end of the bending device 10, which points to the not yet bent part of the tube 100, wedged within the pipeline pipe 103 and thereby locked. Subsequently, the contact element 13 is extended via the hydraulic cylinder 23 and the Wegumleitungselement 22 in the direction of movement A until the contact element 13 arrives at the inner wall 102 of the pipeline pipe 103 and touches it. Subsequently, as described above, the bending of the tube is performed.

*****

LIST OF REFERENCE NUMBERS

10 bending device 38 receiving element

11 main body 39 pivoting element

12 chassis 40 pendulum element

13 contact element 41 hydraulic motor

14 contact element 42 drive pinion

15 contact element 43 drive shaft

16 Top 44 Drive wheel

17 bottom 45 rope

18 Bend 46 Spring element

19 boom 47 axle

20 fulcrum 48 sleeve

21 fulcrum 49 carrier element

22 diverting element 50 pendulum element

23 force introduction element / 51 extension arm

Hydraulic cylinder 52 intake

24 piston rod 53 wheel

25 cylinder chamber 54 hydraulic cylinder

26 pin connection 55 guide bracket

27 wedge 56 hydraulic cylinder

28 wedge surface 57 sliding element

29 wedge 58 wedge

30 carrier 59 carrier element

31 interior 60 wedge

32 base 61 wedge surface

33 cylinder space

34 pin connection 100 pipe

35 outer surface 101 coating

36 inner surface 102 inner wall

37 Face 103 Pipeline pipe curved area

Direction of movement Direction of movement Direction of movement

Claims

claims

1. Apparatus for bending pipes, in particular coated pipes (100), preferably insulated and / or coated with PU foam / rigid polyurethane foam pipes, for pipelines with a positionable in the pipe base body (11) on which a chassis (12 ) is provided for movement in the tube (100) and at least three contact elements (13, 14, 15) for making contact with an inner wall (102) of the tube (100) for introducing a bending force, wherein at least two contact elements (13, 14) on one side (16) of the base body (1 1) at the ends of the base body (11) are provided, and at least one contact element (15) on the opposite side (17) of the base body (11) is arranged, and wherein at least one of Contact elements (13, 14, 15) relative to the base body (11) via a force introduction element (23) movable in the direction (A) of the inner wall (102) of the tube (100) is provided, characterized in that the force introduction element (23) in Wese is arranged horizontally so that a horizontal force is applied, and that a Wegumleitungselement (22) is provided, which is designed so that the horizontally introduced force a substantially vertical movement (A) of the contact element (13, 14, 15) out to the inner wall (102) of the pipe (100).

2. Device according to claim 1, characterized in that the

Chassis (12) is arranged on the base body (11), that the base body (11) is rotatable relative to the chassis (12) and that the direction of rotation is substantially perpendicular with respect to the direction of travel.

3. Apparatus according to claim 1 or 2, characterized in that the second contact element (14) relative to the base body (11) via a force introduction element (56) movable in the direction (C) of the inner wall (102) of the tube (100) is provided and that on the opposite side (17) to second contact element (14) on the base body (11) a further contact element (15) is provided, preferably integrally formed with the opposite contact element (15), which particularly preferably extends to the end of the base body (11) on which the second contact element (14) is arranged.

4. Apparatus for bending pipes, in particular of coated pipes (100), preferably insulated and / or coated with PU foam pipes, for pipes with a positionable in the tube body (11) on which a chassis (12) for moving in Tube (100) is provided and at least three contact elements (13, 14, 15) for making contact with an inner wall (102) of the tube (100) for introducing a bending force, wherein at least two contact elements (13, 14) on one side ( 16) of the base body (11) at the ends of the base body (11) are provided, and at least one contact element (15) on the opposite side (17) of the base body

(11) is arranged, and wherein at least one of the contact elements (13, 14, 15) relative to the base body (11) via a force introduction element (23) movable in the direction (A) of the inner wall (102) of the tube (100) is provided characterized in that the chassis (12) is arranged on the base body (11), that the base body (11) rotatable relative to the chassis

(12) and that the direction of rotation is substantially perpendicular with respect to the direction of travel.

5. The device according to claim 4, characterized in that the force introduction element (23) is arranged substantially horizontally, so that a horizontal force introduction takes place, and that at one end of the Krafteileitungselements at least one Wegumleitungselement (22) is provided, which is designed so the horizontally introduced force is a substantially vertical movement (A) of the contact element (13, 14, 15) towards the inner wall (102) of the pipeline (100).

6. Apparatus according to claim 4 or 5, characterized in that the second contact element (14) relative to the base body (11) via a force introduction element (56) movable in the direction (C) of the inner wall (102) of the Pipe (100) is provided and that on the opposite side (17) to the second contact element (15) on the base body (11), a further contact element is provided, preferably integrally formed with the opposite contact element (15), which is particularly preferably up to the End of the base body (11) extends, on which the second contact element (14) is arranged.

7. Apparatus for bending pipes, in particular coated pipes (100), preferably insulated and / or coated with PU foam / rigid polyurethane foam pipes, for pipelines with a positionable in the pipe base body (11) on which a chassis (12 ) is provided for movement in the tube (100) and at least three contact elements (13, 14, 15) for making contact with an inner wall (102) of the tube (100) for introducing a bending force, wherein at least two contact elements (13, 14) on one side (16) of the base body (11) at the ends of the base body (11) are provided, and at least one contact element (15) on the opposite side (17) of the base body (11) is arranged, and wherein at least one of the contact elements (13, 14, 15) relative to the base body (11) via a force introduction element movable in the direction of the inner wall (102) of the tube (100) is provided, characterized in that the second contact element (14) relative to the ground body (11) via a force introduction element (56) movable in the direction (C) of the inner wall (102) of the tube (100) is provided and that on the opposite side (17) to the second contact element (14) on the base body (11) another Contact element (15) is provided.

8. The device according to claim 7, characterized in that the second movable contact element (14) opposite contact element (15) is integral with the opposite contact element (15) that preferably extends to the end of the base body (11) the second contact element (14) is arranged.

9. Apparatus according to claim 7 or 8, characterized in that the force introduction element (23) is arranged substantially horizontally, then that a horizontal force introduction takes place, and that at least one Wegumleitungselement (22) is provided at one end of the Krafteilleitungselements, which is designed so that the horizontally introduced force is a substantially vertical movement (A) of the contact element (13, 14, 15) out to the inner wall (102) of the pipe (100).

10. Device according to one of claims 7 to 9, characterized in that the chassis (12) is arranged on the base body (11), that the base body (11) is rotatable relative to the chassis (12) and that the direction of rotation substantially at right angles in relation to the direction of travel.

11. The device according to claim 1 to 3, 5, 6, or 8 to 10, characterized in that the Wegumleitungselement (22) has a wedge-shaped element (27) and on the movable contact element (13, 14, 15) to the wedge-shaped element ( 27) corresponding element (29) which is arranged movably on the wedge-shaped element (27).

12. Device according to one of claims 1 to 11, characterized in that the movable contact element (13, 14, 15) via a rotatably on the contact element (13, 14, 15) hinged connecting element, preferably a boom (19) or a steel cable (45), with the base body (1 1) is movably connected, and preferably the connecting element (19, 45) is rotatably hinged to the base body (11), and / or that at least one return element (46), preferably a spring element, between the movable contact element (13, 14, 15) and the base body (11) is provided.

13. Device according to one of claims 1, 2, 4 to 6, or 8 to 12, characterized in that on a Wegumleitungselement (22) opposite side of the force introduction element (23) respectively at the force introduction element (23) and corresponding to the base body ( 11) in each case a pressing surface (35, 36) is present as an abutment for the introduction of force, which are in contact with the introduction of force, and / or that it is the force introduction element (23) is a hydraulic cylinder.

14. Device according to one of claims 2 to 6 or 8 to 13, characterized in that the chassis (12) has a chassis base body (40, 48) which is rotatable relative to the base body (11), and / or that the chassis ( 12) has a front and a rear chassis and the axes of rotation of the chassis of the trolleys (12) extend coaxially, wherein preferably the axis of rotation is arranged so that it is located above the center of gravity of the device and / or the chassis (12).

15. Device according to one of claims 2 to 6 or 8 to 14, characterized in that the chassis (12) has a running body (40, 50), the wheels (44, 53) for advancing the device (10) in the tube ( 100) and which is movable relative to the chassis main body (40, 48) to the axis of rotation of the chassis main body, preferably via at least one hydraulic cylinder.

16. A method for bending pipes, in particular of coated pipes (100), preferably insulated and / or PU foam coated pipes, for pipes comprising the steps of: locally locking a first end of the pipe to be bent (100), movably supporting a opposite end of the tube to be bent, retracting a bending device (10), preferably according to one of claims 1 to 15, in an interior of the tube to be bent (100), passing through the tube (100) with the bending device (10), arranging the bending device (10) at the first bending point, lifting the chassis (12), detecting the current bending angle of the tube (100), activating the force introduction element (23), extending the movable contact element (13, 14, 15) against the inner wall of the pipeline (102), continuing the movement of the contact element (13, 14, 15) against the pipe wall (102) to the bending angle necessary at the bending point, retraction of the contact element (13, 14, 15), off Running the landing gear (12), moving to the next bending point, repeating the bending.

17. The method according to claim 16, characterized in that after lifting the further in the tube (100) located undercarriage (12) according to bottom facing contact element (15) on the tube inner wall (102) is seated and the second movably executed contact element (14) is extended against the tube inner wall (102), so that the bending device is wedged on one side in the tube.

18. The method according to claim 16 or 17, characterized in that during the passage of the tube (100) of the path is taken, preferably by angular momentum of the wheels (44, 53) of the chassis (12) or by means of cable pull sensor as a distance measurement between the bending device ( 10) and the pipe end on the retraction side, and / or that during the lowering of the front chassis (12), the distance is monitored to the pipe inner wall, and / or that the necessary bending angle from the to be achieved bending angle at the bending point and an angle, the resulting from the elasticity of the tube to be bent, composed.

19. The method according to any one of claims 16 to 18, characterized in that the base body (11) of the bending device (10) is aligned at the respective bending location against gravity.

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