EP3259100B1 - Wasser-abrasiv-schneidanlage - Google Patents

Wasser-abrasiv-schneidanlage Download PDF

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Publication number
EP3259100B1
EP3259100B1 EP15706420.5A EP15706420A EP3259100B1 EP 3259100 B1 EP3259100 B1 EP 3259100B1 EP 15706420 A EP15706420 A EP 15706420A EP 3259100 B1 EP3259100 B1 EP 3259100B1
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EP
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Prior art keywords
cutting
sensor
water
pipe
wall
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EP15706420.5A
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German (de)
English (en)
French (fr)
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EP3259100A1 (de
Inventor
Marco Linde
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ANT Applied New Technologies AG
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ANT Applied New Technologies AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E21B29/005—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window

Definitions

  • the invention relates to a water-abrasive cutting system for cutting pipes with the features specified in the preamble of claim 1.
  • Water-abrasive cutting systems are used to cut a wide variety of materials and objects. For example, they are used for cutting pipes, e.g. B. cut off oil production pipes below the seabed. However, such cutting systems can also be used to cut pipes in other applications, for example refineries, well construction, etc. In addition, not only pipes, but also objects of other geometries can be cut with such systems.
  • a cutting head which is connected to a high pressure pump and an abrasive admixing unit via a hose line, is inserted into the interior of the pipe up to the level of the cut to be made.
  • a device for cutting pipes under water is for example from DE 10 2011 052 399 A1 known.
  • a sensor preferably a hydrophone
  • the aid of which the passage of the water jet through the pipe wall is detected is detected.
  • a reliable detection of the severing is not always guaranteed in this way, which is in particular due to the fact that the filling of the spaces between the individual pipes and also the material surrounding the pipe on the outside are not known and depending on these states, different noises can be detected, which do not always indicate a complete severing of the pipe wall.
  • the object of the invention is to improve a water-abrasive cutting system for cutting pipes in such a way that a more reliable detection of the severing of the pipe wall is achieved.
  • This object is achieved by a water-abrasive cutting system with the features specified in claim 1.
  • the water-abrasive cutting system according to the invention is used to cut a wall of any object, in particular, however, to cut pipes, whereby the cutting can be carried out from the inside or from the outside.
  • the cutting is particularly preferably carried out from the inside of the tube.
  • the water-abrasive cutting system according to the invention has, in a known manner, a high-pressure pump which supplies water under high pressure. Furthermore, an abrasive supply is provided in order to mix the high pressure water with the abrasive.
  • the system is preferably designed as a water-abrasive-suspension cutting system, in which the abrasive is mixed with the water in the high-pressure area upstream of an outlet nozzle.
  • the water under high pressure is fed to this cutting head via a pressure line which connects the high pressure pump with a cutting head.
  • the cutting head is preferably designed to be inserted into the interior of a pipe to be cut and to be advanced in this up to the position of the cut.
  • the cutting head is provided with a fixing device which enables fixing, in particular clamping or bracing, on a wall to be cut and in particular in the interior of a pipe at the position of the cut to be made.
  • a nozzle head which has at least one cutting nozzle for emitting a cutting jet, is also arranged on the cutting head, preferably movable, in particular rotatable.
  • the nozzle head is preferably arranged in such a way that the cutting nozzle is directed radially outwards, so that a radial cut can be made in a pipe wall. Due to the movability or rotatability of the cutting head, the cutting nozzle can be moved so that the cutting jet can be moved over the wall to be cut, in particular over the entire circumference of a pipe, in order to sever the pipe wall over the entire circumference in the radial direction.
  • the nozzle head is preferably arranged on the cutting head so that it can rotate through 360 °.
  • a suitable drive for example an electric motor or hydraulic drive, is provided for the rotation.
  • the drive is furthermore preferably designed such that its rotational speed can be adjusted, wherein in particular position detection can also be provided.
  • the cutting beam can thus be moved in a defined manner, so that it is ensured during the cutting process that the Cutting beam is only moved further when the pipe wall is completely cut through in the radial direction.
  • a cutting monitoring device is provided according to the invention.
  • This is part of the water-abrasive cutting system and in particular part of a control device of the cutting system, which controls the cutting process and in particular the movement of the cutting head.
  • manual or automatic regulation of the advance or the rotation of the cutting head is possible with the aid of the cutting monitoring device and the control device.
  • the feed or the rotation can be independently defined and, if necessary, adjusted by the control unit in cooperation with the cutting monitoring device, so that the cutting speed is adapted to the type of material and the material thickness.
  • the cutting monitoring device preferably has an electronic evaluation device. This evaluation device can also be integrated into a control device for the entire cutting system.
  • the cutting monitoring device also has at least one hydrophone and at least one further sensor.
  • the cutting monitoring device or its evaluation device is designed such that it can recognize complete penetration and / or severing of a wall or pipe wall on the basis of the sensor signals of this at least one hydrophone and the at least one further sensor.
  • the at least one further sensor is particularly preferably at least one structure-borne sound sensor, at least one acceleration sensor, and / or at least one pressure sensor.
  • a combination of hydrophone, structure-borne sound sensor, acceleration sensor and a pressure sensor is also preferred.
  • the cutting monitoring device or its evaluation device are preferably designed so that they recognize complete penetration and / or severing of a wall or pipe wall on the basis of the sensor signals from the structure-borne noise sensor, the acceleration sensor, the hydrophone and the pressure sensor. For this purpose, all of these sensors are connected to the cutting monitoring device or its evaluation device for data transmission.
  • the use according to the invention of at least two, preferably four different sensors, namely particularly preferably the hydrophone, a structure-borne sound sensor, an acceleration sensor and a pressure sensor, allows a much more precise detection of the penetration and severing of the wall through simultaneous evaluation and comparison of different signals than is possible using just one Hydrophones would be possible. It is thus possible to make defined specifications in the evaluation device that the signals from different sensors must have certain setpoint values or changes in common in order to detect successful penetration or severing of the wall.
  • the acceleration sensor and the structure-borne noise sensor can particularly preferably be an integrated sensor, that is to say an integrated one Structure-borne sound acceleration sensor be formed. Such a sensor can detect both structure-borne noise and accelerations acting on it.
  • the acceleration sensor and the structure-borne noise sensor are arranged on the cutting head in such a way that they can be brought into a vibration-transmitting connection, preferably in direct contact, with a wall or pipe wall to be cut.
  • the sensors can be arranged on a carrier which is attached to the cutting head in such a way that it can come into contact with the wall or pipe wall.
  • the cutting head is preferably designed such that the acceleration sensor is held firmly against the wall during the cutting process. In this way, movements of the wall can be transmitted directly to the acceleration sensor and recorded by it. Due to the vibration-transmitting contact or the vibration-transmitting connection between the structure-borne sound sensor and the wall, the structure-borne sound sensor can detect structure-borne sound or vibrations from the wall, which change when the wall or pipe wall is penetrated and cut through.
  • the acceleration sensor and the structure-borne noise sensor are furthermore preferably arranged in a contact element of the fixing device which is provided for contact with the wall or pipe wall.
  • This has the advantage that these sensors automatically come to rest on the wall when the cutting head is fixed in the pipe, that is to say preferably on the inside of a pipe wall.
  • the contact element of the fixing device is preferably pressed in the radial direction against the inner wall of the pipe by suitable pressure or tensioning means, in order to clamp the cutting head inside the pipe.
  • the structure-borne noise and acceleration sensor are then placed safely on the pipe wall achieved, whereby the described vibration and movement transmission is guaranteed.
  • the structure-borne noise sensor and / or the acceleration sensor can preferably be located directly in a contact element which is connected to pressure or tensioning means via which this contact element can be moved against the wall or pipe wall.
  • the sensors mentioned can also be arranged in a fixed, immovable contact element which is brought into contact with the wall or pipe wall by moving a further contact element connected to pressure or tensioning means, which is located on an opposite side of the cutting head. An embodiment with such fixed contact elements is described further below.
  • the acceleration sensor is preferably a multi-axis acceleration sensor, in particular a 3D acceleration sensor. Accelerations in different directions, preferably in all three spatial directions, can be recorded.
  • the hydrophone is arranged on an outside of the cutting head in such a way that it can come into contact with a liquid surrounding the cutting head.
  • a liquid surrounding the cutting head During the cutting process z. B. the interior of a pipe to be cut from the inside with liquid, in particular with the water emerging from the cutting nozzle. So the entire cutting head is located in the water during the cutting process. If the hydrophone is arranged on the outside of the cutting head in the manner described, it can thus detect sound in this liquid, that is to say in the water.
  • the noises occurring in the water change in different ways Operating states of the cutting system and especially when penetrating (piercing) or cutting through the wall or pipe wall.
  • the pressure sensor is preferably arranged on the cutting head in such a way that it can detect the pressure of a liquid surrounding the cutting head. As described above, this is preferably water.
  • the pressure sensor comes into direct contact with the liquid or is in pressure-transmitting connection via a suitable line, so that during the cutting process, for. B. the internal pressure of the liquid inside the pipe can be detected.
  • the fixing device has several, in particular three, contact elements distributed over the circumference of the cutting head, which can come into contact with a pipe wall for fixing.
  • This embodiment of the fixing device can be used independently of the cutting monitoring device described above, that is to say also without this cutting monitoring device. This also applies to the details of the fixing device described below.
  • By arranging several, preferably three, contact elements it is possible to firmly clamp the fixing device inside the tube by pressing the contact elements in the radial direction against the inner wall of the tube. Furthermore, a positioning of the cutting head at a distance from the inner wall of the pipe, in particular a centered arrangement, is possible.
  • the multiple contact elements are particularly preferably distributed uniformly over the circumference of the cutting head, so that a uniform transmission of force between the cutting head and the pipe wall results.
  • the contact elements are preferably located in a cross-sectional plane normal to the longitudinal or feed axis of the cutting head. This longitudinal axis corresponds to the longitudinal axis of the pipe to be cut.
  • One of the contact elements is particularly preferably movable in the radial direction.
  • a hydraulic drive for example, can be used for this purpose be provided, via which the contact element can be moved radially outward against the inner wall of the pipe. A compressive force can thus be exerted on the inner wall of the pipe in order to brace the cutting head inside the pipe.
  • only one of the contact elements is particularly preferably movable in the manner described. This simplifies the construction of the cutting head, since only one drive, in particular a hydraulic drive, has to be provided for moving a contact element. With such a configuration, it may not be possible to precisely center the cutting head inside the pipe. However, it has been shown that this is not necessary either, since the structure of the pipe walls, as described above, is generally not rotationally symmetrical in any case.
  • two of the contact elements are rigid in the radial direction and are preferably attached to the cutting head such that they can be replaced. This is especially true when a total of three contact elements are provided.
  • two contact elements are then preferably rigid, while the third contact element can be moved radially in the manner described above.
  • the movement of the movable contact element enables the cutting head to be braced in the pipe, since the movable contact element is pressed against the inner wall of the pipe.
  • the two rigid contact elements are simultaneously pressed against the pipe wall in opposite directions.
  • the rigid contact elements are preferably designed to be exchangeable. For this purpose, contact elements with different radial lengths are preferably provided so that the cutting head can be adapted to different inside diameters of pipes.
  • longer contact elements can be provided for larger pipe cross-sections in the radial direction than for smaller pipe diameters. So with different pipe diameters there is always an approximate Centering of the cutting head possible. Furthermore, the required stroke length of the movable contact element can be kept small in this way.
  • the contact elements are designed in the shape of a runner, the contact elements extending in their runner-shaped longitudinal extension parallel to the feed direction of the cutting head in a pipe. In this way, the contact elements can guide the cutting head inside the pipe when it is inserted into a pipe. This prevents the cutting head from tilting in the pipe during feed.
  • At least one of the contact elements and preferably all contact elements on a surface provided for contact with a pipe wall, that is, the inner wall of the pipe can have engagement means for form-fitting engagement in the pipe wall.
  • This can be, for example, a corrugation or an arrangement of prongs, which dig into the pipe wall and, in addition to the non-positive contact, achieve a positive engagement. This enables better fixation of the cutting head in the interior of the pipe.
  • the cutting monitoring device is furthermore preferably designed such that it detects a severing or severing of the wall, in particular a severing of a pipe, from an increase in the accelerations detected by the acceleration sensor. If z. B. the pipe is completely cut through or separated and the cutting head with the acceleration sensor is preferably located in the upper part of the pipe, this separated pipe part can then move freely to a certain extent depending on the surrounding material, these movements then being controlled by the acceleration sensor can be detected. Such movement is only possible when the pipe is completely severed.
  • the cutting monitoring device can be designed in such a way that it recognizes from a change in the sensor signal of the hydrophone that the cutting jet contains abrasives. This enables a functional check of the abrasive supply.
  • the noise that occurs at the cutting nozzle changes depending on whether only water or water and abrasive comes out of the nozzle. Since the water-abrasive cutting system is preferably a suspension cutting system, the water and the abrasive are preferably brought out of the cutting nozzle together with this.
  • the cutting monitoring device can preferably be designed so that it can puncture or penetrate a wall z.
  • B. of a pipe recognizes a reduction in the pressure detected by the pressure sensor and / or a change in the sensor signal of the structure-borne noise sensor.
  • the noise occurring on the wall or pipe wall also changes when the wall is completely pierced.
  • the pressure drop can occur because the water discharged from the cutting nozzle can exit radially outward from a pipe to be cut from the inside and no longer accumulate inside the pipe.
  • each sensor alone cannot recognize the complete piercing of the wall or pipe wall, so that the signals are preferably evaluated in combination, for which the cutting monitoring device or its evaluation device is designed accordingly.
  • a pressure drop can also occur without all the shells of the pipe being completely pierced.
  • the cutting monitoring device interacts with a control device for regulating a drive of the nozzle head in such a way that the feed movement of the nozzle head, i. H. in particular a rotary movement of the nozzle head is controlled manually or automatically as a function of a signal from the cutting monitoring device.
  • the signal from the cutting monitoring device preferably represents a recognized complete penetration or piercing of the wall.
  • the feed or rotary movement of the nozzle head can thus be regulated in such a way that the nozzle head is only moved further when the cutting jet completely penetrates the wall. I.e. the feed or rotary movement is regulated depending on the cutting result or varied in such a way that the wall is always completely severed.
  • the cutting monitoring device is designed in such a way that it has a learning function.
  • This learning function makes it possible to adapt the cutting monitoring device to different materials and environments.
  • the learning function is designed such that the cutting monitoring device is manually informed of a complete severing or penetration of the wall or pipe wall, whereupon the cutting monitoring device detects and stores the current sensor signals. I.e. the cutting monitoring device learns what a complete penetration of the wall currently sounds like.
  • the cutting monitoring device can then detect the complete penetration or severing of the pipe wall in the further process sequence, ie during the further cutting process.
  • the teaching can be done, for example, in such a way that the nozzle head is in a fixed position Position is held and then a cutting jet is applied for a certain time, during which one can be sure that the pipe wall or wall must be completely severed. This can be a period of time determined experimentally in advance, for example a period of 10 minutes. It should be understood that the standstill of the nozzle head includes a slight pendulum movement.
  • the water-abrasive cutting system shown is a water-abrasive suspension cutting system, that is to say a cutting system in which the abrasive is mixed with the water in the high-pressure area upstream of a cutting nozzle.
  • the cutting system according to the invention has a cutting head 2 which is designed for insertion into a pipe 4.
  • the cutting head 2 is connected to a supply unit 8 via a pressure line 6.
  • the supply unit 8 comprises, in particular, a high-pressure pump which supplies water under high pressure, for example a pressure of 2500 bar or greater.
  • the supply unit 8 also has an abrasive feed.
  • the high pressure suspension that is to say a mixture of water and abrasive, is fed to the cutting head 2 via the pressure line 6.
  • the supply unit 8 remains outside the pipe.
  • the supply unit 8 preferably remains above the water surface while the cutting head 2 is inserted, for example, into an oil delivery pipe to such an extent that it can make a cut below the seabed.
  • the cutting head 2 has a nozzle head 10 at its front end in the insertion direction in which the cutting head 2 is inserted into the pipe 4, on which a radially directed cutting nozzle is arranged.
  • the nozzle head 10 is rotatable with respect to the cutting head 2 about the longitudinal axis X of the cutting head 2, which corresponds to the longitudinal axis X of the pipe 4.
  • a suitable drive not shown in detail here, for example a hydraulic drive or an electric drive, is present in the cutting head 2.
  • the cutting head 2 also has a fixing device which enables it to be braced inside the tube 4.
  • the fixing device has three contact elements 16, 18 and 20.
  • the contact elements 16, 18 and 20 are designed so that they can come to rest on the inner wall of the pipe 4 in a non-positive and / or form-fitting manner and thus brace and fix the cutting head 2 in the pipe 4.
  • the contact element 18 shown is equipped with a hydraulic drive 22 acting in the radial direction relative to the longitudinal axis X.
  • the contact elements 16 and 20 are rigid in this example, that is to say they have a fixed radial length in relation to the longitudinal axis X.
  • the hydraulic drive 22 is extended in the axial direction, so that the contact element 18 is pressed against the inner wall of the pipe 4.
  • the rigid contact elements 18 and 20 are correspondingly pressed against the inner wall of the pipe.
  • the contact elements 16 and 20 are preferably exchangeable, so that contact elements 16, 20 of different radial lengths can be attached to the cutting head 2 in order to achieve an adaptation to different pipe diameters.
  • all three contact elements 16, 18, 20 are provided with a corresponding hydraulic drive 22, with all three hydraulic drives being moved radially outward for bracing. With uniform movement of the three hydraulic drives of the three contact elements 16, 18, 20, the cutting head 2 can be centered in the interior of the pipe 4.
  • the contact elements 16, 18, 20 can additionally have engagement elements 24 on their surface facing the inner wall of the pipe 4, that is to say radially outwardly directed surface, which are shown here for example in the form of prongs. These engagement elements 24 ensure a positive engagement in the inner wall of the tube 4 and for a better fixation of the cutting head in the tube 4. It should be understood that the contact elements 16 and 20 can also be designed in a corresponding manner.
  • the cutting system shown also has a cutting monitoring device.
  • This comprises an evaluation or control unit 26 which, like the supply unit 8, is provided for arrangement outside the pipe 4.
  • the control unit 26 can be integrated into the supply unit 8.
  • the control unit 26 preferably also controls the supply unit 8 and the entire cutting process, i.e. also the movement of the nozzle head 10 to form the cut in the raw wall of the pipe 4.
  • the control unit 26 can also actuate the hydraulic drives 22 to clamp the cutting head 2 in the pipe 4 control.
  • the control unit 26 is connected to the cutting head 2 via a line connection 28.
  • This can be an electrical or, for example, an optical connection that allows data to be transmitted from the control unit 26 to the cutting head 2 and in the opposite direction.
  • the line connection 28 can be integrated with the pressure line 8 in a line.
  • the cutting monitoring device has four different sensors in the cutting head 2.
  • this is a hydrophone 30, which is arranged on an outer wall of the cutting head 2 close to the nozzle head 10 and the cutting nozzle 12.
  • This hydrophone 30 detects noises in the liquid which are located inside the pipe 4 during the cutting process.
  • This is in particular the liquid emerging from the cutting nozzle 12, that is preferably water.
  • a pressure sensor 32 is arranged on the outside of the cutting head 2, also in contact with the liquid in the pipe 4. This records the water pressure inside the pipe 4 during the cutting process.
  • the acceleration sensor 36 is preferably designed as a multi-axis, particularly preferably as a three-axis acceleration sensor.
  • the structure-borne noise sensor 34 detects vibrations in the pipe, in particular those vibrations which are caused by the cutting beam 14.
  • the vibrations change when the ambient conditions change, i. H. For example, the pipe wall is completely penetrated, the pipe wall is completely separated or cut through, etc. The different states can be recognized from the change in the vibrations.
  • the pipe 4 has three shells, that is, it has three metal pipes 38, 40 and 42 arranged one inside the other, the metal pipe 42 forming the inner wall of the pipe 4 and the metal pipe 38 forming the outer wall of the pipe 4.
  • the free spaces between the pipe 38 and 40 and the pipe 40 and 42 are each filled with concrete 44.
  • the metal pipes 38, 40, 42 are arranged concentrically to one another around the longitudinal axis X and the free spaces are completely filled with concrete 44. It is to be understood, however, that in practice the metal pipes 38, 40, 42 cannot be arranged concentrically to one another and the free spaces may not be completely filled with concrete 44 either.
  • the tube 4 has a wall thickness that varies over the circumference and the pipe wall has different consistencies. This makes it difficult to monitor the cutting process, this being made possible by combining the signals from the four sensors, that is to say the hydrophone 30, the pressure sensor 32, the structure-borne sound sensor 34 and the acceleration sensor 36 in combination.
  • the control unit 26 evaluates the sensor signals in combination.
  • the cutting process and the cutting monitoring takes place as follows. After the cutting head 2 has been introduced into the pipe in a desired axial position along the longitudinal axis X, the cutting head 2 is fixed in the pipe 4 by extending the hydraulic drive or drives 22. After fixing, the cutting process is started by first starting the high pressure water supply and then the abrasive supply via the supply unit 8. This process can particularly preferably be monitored by the hydrophone 30. From the noise in the water with which the inside of the pipe 4 fills, it can be detected whether only water or a mixture of water and abrasive is emerging from the cutting nozzle 12.
  • the cutting process begins, whereby the nozzle head 10 is not initially rotated until the cutting jet 14 has completely penetrated the pipe wall, i.e. the metal pipes 38, 40 and 42 and the concrete 44 in the Has completely pierced the gaps.
  • This can be detected via the structure-borne noise sensor 34, the signal from the hydrophone 30 and the pressure sensor 32 being used at the same time.
  • the signals are evaluated in combination.
  • the pressure sensor 32 detects a pressure drop inside the pipe 4 and the structure-borne noise sensor 34 and the hydrophone 30 must detect a corresponding change in the vibration pattern recorded by them, so that the control unit 26 can deduce from this that the pipe wall of the pipe 4 has been completely severed .
  • the signal from pressure sensor 32 alone would not be sufficient, for example, since the inner metal tube has been cut through 42, if, for example, the free space between the metal pipes 40 and 42 is not completely filled, a pressure drop can already occur without the pipe wall being completely severed.
  • a change in the signal of the hydrophone 30 and the structure-borne noise sensor alone can also be used to conclude that the pipe wall has been severed completely, even if there is no pressure drop inside the pipe 4. This can be the case, for example, when the outer metal tube 38 is surrounded by a dense material, so that there is no pressure drop inside the tube 4 even when the outer metal tube 38 is cut through.
  • the nozzle head 10 After the pipe wall of the pipe 4 has been completely severed at a circumferential position, the nozzle head 10 is set in motion, rotating it through 360 °. The rotary movement is carried out so slowly that the cutting jet 14 always cuts through the entire wall thickness of the pipe 4. This is monitored by monitoring the sensor signals from the four sensors mentioned in combination.
  • the speed of rotation can be varied by the control unit. For example, the speed of rotation can be slowed down when areas with a thicker wall thickness are reached. A no longer complete cutting through of the pipe wall is in turn detected from changes in the signals of the sensors, in particular the vibration signal of the hydrophone 30 and the structure-borne sound sensor 34. In particular, automatic regulation of the rotation or rotational speed of the nozzle head 10 as a function of the detected sensor signals is possible.
  • the rotational movement or rotational speed is regulated in such a way that the advance speed is carried out as fast as possible, but as slowly as necessary in order to ensure complete penetration of the pipe wall.
  • the complete cutting through of the pipe can in turn be detected in particular with the aid of the acceleration sensor 36.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP15706420.5A 2015-02-18 2015-02-18 Wasser-abrasiv-schneidanlage Active EP3259100B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/053432 WO2016131483A1 (de) 2015-02-18 2015-02-18 Wasser-abrasiv-schneidanlage

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EP3259100A1 EP3259100A1 (de) 2017-12-27
EP3259100B1 true EP3259100B1 (de) 2020-10-14

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US (1) US10525569B2 (zh)
EP (1) EP3259100B1 (zh)
CN (1) CN107249820B (zh)
AU (1) AU2015383612B2 (zh)
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US20180021922A1 (en) 2018-01-25
CN107249820A (zh) 2017-10-13
AU2015383612A1 (en) 2017-08-31
US10525569B2 (en) 2020-01-07
WO2016131483A1 (de) 2016-08-25
CN107249820B (zh) 2020-12-22
AU2015383612B2 (en) 2020-06-18
EP3259100A1 (de) 2017-12-27
DK3259100T3 (da) 2021-01-11

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