KR102524893B1 - Method using water jet for cutting pile that supports top side when dismantling offshore structures in underwater - Google Patents

Abstract

The present invention relates to a device for cutting piles supporting the top side of a marine structure during dismantlement work of the marine structure by spraying water jets underwater, and more specifically, to a pile cutting device, in which a moving frame can move circumferentially along the fixed frame when the fixed frame is fixed to the pile and a water jet unit can move circumferentially on the moving frame, thereby making it easy to install the pile cutting device around the pile at a planned cutting location. The pile cutting device according to the present invention is easy to install around the pile at the planned cutting location, is quick and convenient in installation and retrieval, can reduce personnel involvement and accident risks due to automation of underwater cutting work, and allows for remote monitoring of whether the water jet has penetrated the pile and whether the pile cutting is complete.

Description

Method using water jet for cutting pile that supports top side when dismantling offshore structures in underwater}

The present invention relates to an underwater pile cutting method using a water jet, and more specifically, includes a fixed frame and a movable frame, wherein the movable frame is movable in a circumferential direction along the fixed frame while the fixed frame is fixed to the pile, Since the water jet unit is supported by the movable frame and can move in the circumferential direction along the movable frame, the present invention relates to a pile cutting method that is easy to install to surround a pile at a cutting planning point.

Although the present invention is primarily aimed at cutting piles in water, it can also be used to cut piles on land.

Examples of structures for supporting offshore structures include suction bucket structures, monopile structures, jacket structures, and the like.

The suction bucket structure is a structure in which a jacket and a suction bucket are combined, and a brace is connected to the jacket leg to distribute the load, and the bearing capacity is secured by three large-diameter suction foundations. It is a structure that is grouted after driving or excavation, and the jacket structure is a structure in which a jacket and a pile are combined, and a brace is connected to the jacket leg to distribute the load, and the ground bearing capacity is secured by a three-pile foundation.

These structures have in common that piles are used to support the top side of the upper part.

On the other hand, offshore structures must be appropriately removed or disposed of on-site when their economic useful life is over or when they are no longer operational due to disasters such as typhoons and fires. In this regard, the United Nations Convention on the Law of the Sea (UNCLOS III) 1982 and the guidelines and guidelines of the International Maritime Organization (IMO) are the most widely used standards around the world. IMO guidelines state that offshore installations or structures on the continental shelf or EEZ should be decommissioned. This is a requirement for marine environment preservation and safe navigation. According to IMO guidelines, dismantlement is recommended for offshore plants that are more than 25 years old after installation. It states that it must be dismantled/removed.

For the disassembly/removal work, it is necessary to remove the pile. In the past, divers were put on the seabed to perform plasma cutting (cutting) or cut with a wire saw (Diamond wire cutting).

However, this cutting (cutting) method has a problem in that it is difficult and complicated to put, install, and retrieve equipment on the seabed because the operation is performed on the seabed. And, since divers are put on the seabed for this work, there is a high risk of human accidents.

In addition, when there is an obstacle around the pile, the cutting operation must be performed after the obstacle is first removed, which increases time and cost. Furthermore, the existing cutting method has a problem in that the diver must be put back into the seabed to check whether the cutting operation has been completed.

In order to solve the above problems, the present applicant developed a device for cutting a file by spraying a water jet and registered it as Korean Patent Registration No. 10-2388686 (name of the invention: non-contact file cutting device using a water jet). .

The device is put inside the pile, and after being put inside the pile, it rotates along the circumference and sprays a water jet to cut (cut) the pile. However, since this device is fixed inside the pile using a gripper, there is a limit in that it can be applied only to piles with a diameter of less than 2 m. That is, there is a problem in that it is difficult to use this device for a file having a diameter of 2 m or more.

In order to solve this problem, the present applicant developed a device and method for cutting (cutting) a pile by spraying a water jet from the outside of the pile, and applied for it as Korean Patent Application Nos. 10-2022-0139230 and 10-2022-0139240 there is a bar This device and method cuts the pile as the water jet jet moves along the rail after the rail is installed to surround the pile. This device and method have no limit on the diameter of the file that can be cut.

The present invention is a further development of this device and method, and an object of the present invention is to provide a pile cutting method that is easy to install so as to surround the pile at an underwater cutting plan position when dismantling an offshore structure. Specifically, when the cutting device is put into the water while surrounding the pile from the surface of the water, the brace installed to connect neighboring piles is caught or caught in seaweed or shellfish attached to the pile, so the cutting device cannot be installed at the desired location. A problem arises, and the present invention can solve this problem.

Another object of the present invention is to reduce the risk of accidents due to manpower input because there is no limit on the diameter of the pile that can be cut, and the underwater cutting operation can be automated, and the installation and recovery are convenient and quick, and whether the pile penetrates It is to provide a cutting method that can remotely know whether or not the file has been cut.

In order to achieve the above object, the pile cutting method according to a preferred embodiment of the present invention is a method of cutting the pile 1 by spraying a water jet from the outside of the pile 1 supporting a marine structure or a ground structure.

Specifically, the file cutting method includes: (a) positioning the file cutting device 100 at a cutting planned point; (b) fixing the fixing frame 10 to the pile 1 at the cutting planned point; (c) cutting the file 1 by spraying a water jet while moving the water jet unit 70 along the moving frame 50 while the moving frame 50 is fixed to the fixed frame 10; and, (d) moving the moving frame 50 along the fixed frame 10; (e) After step (d), while moving the water jet unit 70 along the moving frame 10 in a state in which the moving frame 50 is fixed to the fixed frame 10, the water jet is sprayed so that the file 1 Cutting the; may include.

When the structure is an offshore structure, the pile cutting method may remove the upper structure of the offshore structure before step (a). In the step (a), the file cutting device 100 may be positioned at the cutting plan location using a crane.

The step (b) includes: (b1) moving the arc portion 11 so that the file 1 is inserted into the arc portion 11; And, (b2) step of fixing the circular arc portion 11 to the file (1) by using the spacing control unit 40 and ensuring that the distance between the outer surface of the file (1) and the circular arc portion 11 is constant; can include

Between the steps (b1) and (b2) or after the step (b2), the connecting member 21 is used to connect both ends of the arc portion 11 to surround the outer surface of the pile 1 can

One end of the connecting member 21 may be connected to one end of the circular arc part 11 by the first fixing part 23, and the opposite end of the connecting member 21 is an arc by the second fixing part 24. It may be connected to the opposite end of part 11.

The second fixing part 24 includes a cylinder 25, and after the connecting member 21 is fixed (fastened) to the second fixing part 24, the connecting member 21 is moved backward by the cylinder 25. Tension is generated, and accordingly, the connecting member 21 can be in close contact with the outer surface of the pile 1, and the arc portion 11 can be firmly fixed to the pile 1.

The movable frame 50 includes inner and outer rails 51 and 52 installed to extend in a circumferential direction; and rack gears or strips installed on the inner side of the inner rail 51 and the outer side of the outer rail 52 to extend along the circumference.

The rack gear or strip of the inner rail 51 is installed to engage with the pinion gear or sprocket 34 of the drive motor 33, and the moving frame 50 can be moved in the circumferential direction by the rotation of the drive motor 33. there is.

And, the rack gear or strip of the outer rail 52 is installed to engage with the pinion gear 75 or sprocket of the water jet unit 70, and the water jet unit 70 rotates around the circumference by rotation of the pinion gear 75 or sprocket. direction can be moved.

In the step (c), while the moving frame 50 is fixed to the fixed frame 10, the water jet unit 70 moves along the moving frame 50 and cuts a part of the file 1, ) step cuts the remaining part of the file 1 after step (d).

Further, the sum of the central angle θ1 of the circular arc portion 11 and the central angle θ2 of the moving frame 50 preferably exceeds 360°.

The water jet unit 70 includes a spraying unit 76 for spraying a water jet; And, a camera or ultrasonic scanning sonar for photographing a file or surroundings and transmitting the image signal; may include.

When an obstacle obstructing the operation of the water jet unit 70 is detected by a camera or an ultrasonic scanning sonar, the spraying unit 76 may eject the water jet to remove the obstacle.

The file cutting method according to the present invention has the following effects.

First, it is easy to install to surround the pile at the cutting plan position during the dismantling of the offshore structure.

Second, the pile can be cut by spraying a water jet from the outside of the pile supporting the top side of the offshore structure. Accordingly, it can also be applied to a pile having an outer diameter (diameter) of 2 m or more.

Third, since the underwater cutting operation can be automated, the risk of accidents due to the input of manpower can be reduced, and the installation and recovery can be performed conveniently and quickly.

Fourth, since it is possible to know remotely whether the pile has been penetrated and whether the pile has been cut, a diver does not need to be put on the seabed to check it.

Fifth, not only piles of offshore structures, but also piles of ground structures can be cut.

1 is a perspective view showing a file cutting device according to a preferred embodiment of the present invention.
Figure 2 is a perspective view showing that the pile cutting device is installed in the pile.
Figure 3 is a plan view of Figure 2;
Figure 4 is a plan view showing that the pile cutting device is installed in the pile, and the moving frame is moved to be positioned at the opening of the fixed frame.
Figure 5 is an enlarged view showing a driving unit for moving the moving frame in the circumferential direction, and a gap control unit for adjusting the gap between the outer surface of the pile and the fixed frame.
6 is an enlarged view of a water jet unit;
7 is a perspective view showing a connecting member;
8 is a flow chart showing a cutting method using a file cutting device.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, since the embodiments described in this specification and the configurations shown in the drawings are merely embodiments of the present invention and do not represent all of the technical spirit of the present invention, various equivalents that can replace them at the time of the present application It should be understood that there may be variations and examples.

The pile cutting method according to the present invention is mainly for cutting (cutting) piles supporting offshore structures, but is not necessarily limited to this. For example, the pile cutting method can also be used to cut piles of ground structures, which will be apparent to those skilled in the art after reading this specification. However, below, for convenience of description, the case where this cutting method is used for cutting offshore structure support piles will be described as an example.

And, in the [Description of the Invention] and [Claims], 'pile' means a steel pipe or a composite pipe filled with concrete inside the steel pipe as for supporting the upper load, but is not necessarily limited thereto, and is intended to support the load. It should be interpreted to mean various files.

In addition, water jet should be construed as meaning both with and without an abrasive. Further, 'horizontal' includes not only horizontal in a mathematical sense but also inclines close to the horizontal, and 'vertical' includes not only vertical in a mathematical sense but also inclines close to the vertical.

In addition, in the present specification, the driving motors 33 and 74, the cylinder 25, and the cylinder of the injection unit 76 may be controlled and operated by a hydraulic pump and a control valve of a dedicated control system. The dedicated control system may control the components through supply of hydraulic pressure and control signals.

And, in the drawings below, the same reference numerals denote the same configuration.

[Pile Cutting Device]

1 is a perspective view showing a file cutting device according to a preferred embodiment of the present invention, FIG. 2 is a perspective view showing that the file cutting device is installed in a pile, and FIG. 3 is a plan view of FIG. 2 .

As shown in the drawing, the file cutting device 100 includes a fixed frame 10, a movable frame 50 installed on the fixed frame 10 so as to be movable along the fixed frame 10, and a movable frame 50 It is installed to be movable along and may include a water jet unit 70 for spraying a water jet to the pile (1).

The fixed frame 10 is installed to surround the pile 1. Preferably, the fixing frame 10 has a shape matching the cross section of the pile 1, has a regular interval from the outer surface of the pile 1, and surrounds a part of the circumference of the pile 1. For example, when the cross section of the pile (1) is circular, the fixed frame (10) is a circular arc concentric with the pile (1), but has a slightly larger diameter than the pile (1).

Preferably, the fixing frame 10 may include an arcuate portion 11 and an open portion 12 . The circular arc portion 11 extends in the circumferential direction and supports the moving frame 50 . And, the opening part 12 is a part where the circular arc part 11 is not extended and becomes an inlet into which the file 1 is inserted into the arc part 11. For example, when the cross section of the pile 1 is circular, since the arc portion 11 and the opening portion 12 together form a circular shape, when the moving frame 50 is positioned to correspond to the opening portion 12, the arc portion 11 and the opening portion 12 form a circular arc. The unit 11 and the moving frame 50 cooperate to completely enclose the pile 1.

When the central angle θ1 of the circular arc part 11 and the central angle θ2 of the moving frame 50 are 180° or more, the distance between both ends of the circular arc part 11 and the distance between both ends of the moving frame 50 It is preferable to be longer than the diameter of the pile 1, which is when the moving frame 50 is positioned so as to correspond to the arc portion 11 (when the moving frame is in the same direction as the arc portion), the file 1 has a circular arc This is to be inserted into the part 11. For reference, the central angle θ1 means an angle between the center of the concentric circle of the circular arc part 11 and both ends of the circular arc part 11, and the central angle θ2 is the center of the concentric circle of the moving frame 50 and the moving frame. It means the angle formed by both ends of (50). Although the central angle θ1 and the central angle θ2 are shown to be the same in FIG. 3 , the central angle θ1 and the central angle θ2 may be different from each other.

In addition, the sum of the central angle θ1 of the arc portion 11 and the central angle θ2 of the moving frame 50 exceeds 360°, and the file 1 is inserted into the arc portion 11 through the opening 12. It is desirable to be able to If the sum of the central angle θ1 and the central angle θ2 is 360° or less, even if the movable frame 50 is located in the open portion 12, the circular arc portion 11 and the movable frame 50 may form a complete circle together. There is a problem that there is a part that cannot be cut accordingly.

More preferably, the central angle (θ1) of the circular arc portion (11) is 180 ° or more, and it is preferable that the file (1) can be inserted through the opening portion (12). When the central angle (θ1) of the arc portion 11 is less than 180 °, as shown in FIGS. 2 and 3, the fixing frame 10 ) is difficult to firmly fix to the file 1, and both ends of the connecting member 21 and both ends of the moving frame 50 may extend to the outside of the arc portion 11 and protrude, There is a problem that the device may be damaged due to a collision with an object or the like.

The circular arc portion 11 has the same curvature and the same center as the movable frame 50 described later, and the strip 53 and the rack gear 54 installed on the movable frame 50.

A rail support unit, a driving unit, and a spacing adjusting unit 40 may be installed in the fixed frame 10 .

A plurality of rail supports may be installed along the circumferential direction of the fixing frame 10 . As shown in FIG. 5 , the rail support may include a bracket 30 installed on the fixed frame 10 and rollers 31 and 32 rotatably installed on upper and lower portions of the bracket 30, respectively. For reference, the sky blue line shown as a dotted line in FIG. 5 shows the fixed frame 10 and the spacing control unit 40, and the relationship between the inner and outer rails 51 and 52, the strip 53 and the through hole 53a. It is for distinction.

The roller 31 supports the upper rail of the inner rail 51 to be movable in the circumferential direction, and the roller 32 supports the lower rail of the inner rail 51 to be movable in the circumferential direction. Since concave grooves are formed on the outer circumferential surfaces of the rollers 31 and 32, it is possible to support the upper and lower rails movably and prevent separation by matching with the end surfaces of the upper and lower rails having circular cross sections.

The driving unit moves the moving frame 50 in the circumferential direction. A plurality of driving units may be installed at regular angular intervals along the circular arc part 11, but as long as they are installed so that the central angle between the driving units is smaller than the central angle θ2 of the moving frame 50, the movement of the moving frame 50 is hindered. do not give The figure shows that the four driving parts are installed on the circular arc part 11, but are installed only at both ends of the arc part 11, and the central angle between the driving parts is smaller than the central angle θ2 of the moving frame 50.

The driving unit may include a driving motor 33 and a sprocket 34 rotated by the driving motor 33 . The driving motor 33 may be operated by hydraulic pressure supplied from the outside (ground), power, or a built-in battery. The sprocket 34 is engaged with the through hole 53a of the strip 53, and accordingly, when the sprocket 34 is rotated, the moving frame 50 is moved in the circumferential direction. For reference, the strip 53 is installed to extend along the circumferential direction on the inner surface of the moving frame 50, that is, the inner surface of the inner rail 51. In addition, through holes 53a are formed in the strip 53 at regular intervals.

On the other hand, a pinion gear (not shown in the drawing) may be installed instead of the sprocket 34 and a rack gear (not shown in the drawing, meshed with the pinion gear) may be installed instead of the strip 53. Those skilled in the art who refer to the specification will be able to easily understand the configuration.

The file cutting device 100 may have a sensor for stopping the movement of the moving frame 50 relative to the circular arc portion 11 . Specifically, sensors are installed at both ends of the circular arc portion 11, and the sensors sense both ends of the moving frame 50 to stop the operation of the driving motor 33, thereby stopping the movement of the moving frame 50. can be stopped An example of this sensor is a limit switch, and both ends of the moving frame 50 may have protrusions for operating the limit switch.

The spacing adjusting unit 40 is installed on the arc portion 11 and adjusts the interval between the outer surface of the pile 1 and the arc portion 11. A plurality of spacing adjusting units 40 may be installed at predetermined intervals along the circumferential direction of the circular arc unit 11 .

By the gap adjusting unit 40, it is preferable that the distance between the outer surface of the pile 1 and the arc portion 11 (the distance between the outer surface of the pile and the moving frame) is constant, which ), if the distance is not constant, it interferes with the cutting performance.

The spacing adjusting unit 40 is a support 41, a long bar 43 installed through the upper and lower portions of the support 41, respectively, and a nut 42 screwed to the long bar 43 on both sides of the support 41 ) may be included. A screw thread is formed on the outer surface of the long rod 43, and the screw thread is screwed with the nut 42. Therefore, after unscrewing the nuts 42 screwed on both sides of the support 41, adjusting the protruding length of the long bar 43, and then tightening the nut 42 again, the long bar 43 can contact and support the pile 1. there is.

On the other hand, as shown in Figures 2 to 4 and 7, the file cutting device 100 may be provided with a connecting member (21). When the circular arc part 11 is a pipe, the connecting member 21 may be installed by being inserted into the inside of the pipe (circular arc part). In this case, the connecting member 21 preferably has the same curvature as the tube (circular arc).

The connecting member 21 is a member installed to connect both ends of the circular arc portion 11, so that the circular arc portion 11 is firmly fixed to the pile 1.

The connecting member 21 is a strip-shaped member extending long along its longitudinal direction, and has a long hole 22 extending continuously along the longitudinal direction. That is, one long hole 22 is continuously formed along the longitudinal direction of the connecting member 21 .

As an alternative to this, the connecting member 21 may be a steel wire, chain, or the like. An iron wire, chain, etc. is installed to connect the first and second fixing parts 23 and 24.

In addition, one end of the connecting member 21 is installed (connected) to one end of the arc portion 11 by the first fixing part 23, and the other end of the connecting member 21 is installed (connected) to one end of the second fixing part 24. ) may be installed (connected) to the other end of the arc portion 11.

The first fixing part 23 may be installed at one end of the circular arc part 11 so as to pass through the long hole 22 . And, the second fixing part 24 may include a hook 26, and the hook 26 is inserted into the long hole 22 and fastened so that the connecting member 21 is connected to the second fixing part 24. can be connected to Preferably, the hook 26 is installed at the front end of the cylinder 25 so that its position can be adjusted according to the extension and contraction of the cylinder 25. That is, after the cylinder 25 is advanced toward the long hole 22 and the hook 26 is fastened (inserted) into the long hole 22, tension is applied to the connecting member 21 to make it taut. ) may apply tension to the connection member 21 by moving backward. 2 and 4, the connecting member 21 has a circular arc shape and is spaced apart from the outer surface of the pile 1 at a predetermined interval, but when tension is applied to the connecting member 21 by the cylinder 25 The connection member 21 may be in close contact with the outer surface of the pile 1, and the fixing frame 10 may be firmly fixed to the pile 1 by this close contact.

On the other hand, when the connecting member 21 is an iron wire or chain, the iron wire or chain may be fixed to the hook 26 or directly fastened to the tip of the cylinder 25 using a known fastening means.

The moving frame 50 is installed on the fixed frame 10 so as to be movable along the fixed frame 10 . The moving frame 50 may include an inner rail 51 and an outer rail 52 . The inner rail 51 and the outer rail 52 have the same curvature as the circular arc portion 11 but may be installed outside the circular arc portion 11 . The inner and outer rails 51 and 52 may include upper and lower rails, respectively. Accordingly, the moving frame 50 may include four rails.

In addition, support plates 55 are radially installed on the inner and outer rails 51 and 52 at predetermined intervals to connect and support the four inner and outer rails 51 and 52.

The upper and lower rails may be made by bending a tube having a circular cross section to form an arc. The upper and lower rails of the inner rail 51 may have cross sections matching the outer surfaces of the rollers 31 and 32, and due to this matching structure, the moving frame 50 moves along the rollers 31 and 32. While being guided (supported) by the moving frame 50 is prevented from being moved in the circumferential direction.

The outer rail 52 guides and supports the water jet unit 70 to move in the circumferential direction and prevents separation. To this end, the upper and lower rails of the outer rail 52 may have cross sections matching the outer surfaces of the guide rollers 72 and 73 .

The above-described strip 53 may be installed on the inner surface of the inner rail 51 to extend along the circumferential direction, and the rack gear 54 may be installed on the outer surface of the outer rail 52 to extend along the circumferential direction. there is.

Meanwhile, although the central angle θ2 of the circular arc of the moving frame 50 and the central angle θ1 of the circular arc part 11 are shown in FIG. 3 as being the same, the central angle θ2 is smaller than, equal to, or greater than the central angle θ1. It can be, if the central angle (θ2) is greater than the central angle (θ1), the distance between both ends of the moving frame 50 should be greater than the diameter of the pile (1).

And, as described above, it is preferable that the sum of the central angle θ2 and the central angle θ1 exceed 360°.

The movable frame 50 is movable with respect to the fixed frame 10, and this movement may be performed by the driving unit, but as an alternative to this, it may be manually performed by an underwater diver.

The water jet unit 70 is movably installed on the moving frame 50, and cuts (cuts) the pile 1 by spraying the water jet to the pile 1. As shown in FIGS. 1 to 2 and 6, the water jet unit 70 includes a bracket 71, upper and lower guide rollers 72 and 73 installed on the upper and lower parts of the bracket 71, respectively, and a drive motor. 74, a pinion gear 75 rotated by the driving motor 74, a rack gear 54 installed on the outer side of the outer rail 52, and a spraying part 76 for spraying a water jet. can do.

Bracket 71 may be installed on the outer side of the outer rail (52). The upper guide roller 72 is installed to guide the upper rail of the outer rail 52 and the lower guide roller 73 is installed to guide the lower rail of the outer rail 52 . Since the outer surfaces of the upper and lower guide rollers 72 and 73 are concave to match the end surfaces of the upper and lower rails, the water jet unit 70 is prevented from being separated and stable movement is possible.

The driving motor 74 may be operated by an external, for example, hydraulic pressure or power supplied from a ship or by a built-in battery. Preferably, the driving motor 74 may be controlled by a hydraulic pump, a control valve, or the like of a dedicated control system (not shown in the drawing). The rotational force of the driving motor 74 may be transmitted to the pinion gear 75 after the R.P.M. is adjusted by the reduction gear.

The pinion gear 75 is installed to mesh with the rack gear 54. Accordingly, when the pinion gear 75 is rotated by the rotational force transmitted from the driving motor 74, the water jet unit 70 may be moved along the rack gear 54.

Meanwhile, a sprocket may be installed instead of the pinion gear 75 and a strip 53 having a through hole 53a may be installed instead of the rack gear 54 .

The injection unit 76 cuts (cuts) the pile 1 by injecting a water jet supplied from the outside, for example, from a ship on the sea. Waterjets can be supplied alone or with abrasives. The injection unit 76 may have a typical configuration of a water jet injection device. The injection pipe of the injection unit 76 may be extended or contracted according to the distance from the pile 1, and this extension and contraction may be performed by a pneumatic or hydraulic cylinder or a motor.

A nozzle is installed at the tip of the injection pipe. Preferably, the nozzle is spaced apart from the outer surface of the pile (1) by a predetermined distance, and a sensor (not shown in the drawing) may be installed to adjust or control this distance, which sensor is installed on the outside of the pile (1). The distance to the surface is sensed and the signal is transmitted to the control unit, and the control unit operates the cylinder or the electric motor in response to the signal.

An electromagnet sensor for detecting magnetic force may be used as the sensor, but a conventional sensor for detecting a short distance may be used. The electromagnet sensor detects the distance from the inner surface of the pile 1 and the distance from the outside, respectively, and transmits the signal to the control unit, and the control unit operates the cylinder or electric motor in response to the signal.

Preferably, the injection unit 76 can rotate up, down, left, and right. The injection unit 76 not only cuts the pile 1 but also interferes with the work, such as a brace installed to connect neighboring piles to each other (not shown), attached to the outer surface of the pile 1 It is preferable that it can be rotated up, down, left, and right so as to cut (or remove) seaweed or shellfish. This rotation can be achieved by a configuration known in the art.

Meanwhile, the file cutting device 100 may include a camera (not shown in the drawing) and/or an ultrasonic scanning sonar (not shown in the drawing). When the file cutting device 100 is put into the water using a crane on a ship, an operator on the ship can perform remote work while viewing images transmitted from a camera and/or an ultrasonic scanning sonar. A camera or ultrasonic scanning sonar may be installed in at least one of the water jet unit 70, the fixed frame 10, and the moving frame 20. The ultrasonic scanning sonar transmits and receives ultrasonic waves to detect surrounding structures or topography. Ultrasonic scanning sonar is more effective when visibility is difficult underwater.

The camera and/or ultrasonic scanning sonar installed in the water jet unit 70 captures the outer surface of the pile 1, the cutting of the pile 1 by the water jet, or the obstacles around the pile 1, and captures the image. can be sent to To this end, the camera and ultrasonic scanning sonar may be installed to rotate up, down, left, and right.

In addition, the file cutting device 100 may further include a vibration sensor (not shown in the drawing) and/or an acoustic sensor (not shown in the drawing). The vibration sensor measures vibration generated during the pile cutting operation by the water jet, and the acoustic sensor measures the sound generated during the pile cutting operation by the water jet. The vibration sensor and the acoustic sensor may be installed in at least one of the bracket 71, the injection unit 76, and the pile 1.

Using the signal transmitted from the vibration sensor and/or the acoustic sensor and the cutting operation image captured by the camera, it is possible to determine whether the water jet has penetrated the pile 1 and whether the pile cutting operation has been completed at a remote location (for example, a ship). can be found in

The file cutting device 100 may further include an elevating unit (not shown in the drawing). The elevating unit is installed on a ship at sea. The elevating unit may be a crane. The crane may include a wire connected to the fixed frame 10 and a winder for unwinding or winding the wire.

When disassembling an offshore structure, after removing the top side (upper structure), the pile cutting device 100 is suspended from a crane and put into the water, and when the pile cutting work is completed, it can be lifted using a crane.

[Pile cutting method]

Then, below, a file cutting (cutting) process using the file cutting device 100 will be described. 8 sequentially shows the cutting process.

First, the spacing adjusting unit 40 is adjusted in response to the outer diameter (diameter) of the file 1 to be cut. This operation can be done on board or on land. This operation may be performed by loosening the nut 42 to move the long bar 43 forward and backward, and then tightening the nut 42 again to fix it to the support 41. Subsequently, the pile cutting device 100 is hung on a crane (not shown in the drawing) in the ship and put into the water (S10). When put in water, it is preferable that the moving frame 50 is located on the side of the arcuate portion 11 as shown in FIG. 1 .

Subsequently, when the file cutting device 100 reaches the planned cutting position, the diver moves the arcuate portion 11 so that the file 1 is seated (inserted) into the arcuate portion 11 through the opening portion 12. Then, the diver withdraws the connecting member 21 from one end of the arc portion 11 and connects it to the second fixing part 24 at the opposite end, and then moves the cylinder 25 backward to tension the connecting member 21 This causes the circular arc portion 11 to be firmly fixed to the file 1 (S20). Figures 2 and 3 show that this fixing operation has been completed.

Next, the water jet unit 70 cuts the pile 1 while alternately repeating movement and water jet jetting along the moving frame 50 or slowly moves and jets the water jet to cut the pile 1 (S30). In step S30, the moving frame 50 maintains a fixed state with respect to the fixed frame 10.

This cutting operation may be remotely controlled by a worker on the ship while viewing an image captured by a camera and/or an ultrasonic scanning sonar installed in the water jet unit 70 or the like. In addition, whether or not the water jet penetrates the pile 1 can be determined by analyzing the captured image and the signal transmitted from the vibration sensor and/or the acoustic sensor by a worker on the ship. The vibration sensor and the acoustic sensor may be installed in at least one of the bracket 71, the injection unit 76, and the pile 1.

On the other hand, when the water jet unit 70 moves along the moving frame 5, it is checked whether there is an obstacle in the vicinity that obstructs the movement by referring to an image captured by a camera and/or an ultrasonic scanning sonar, and the water jet unit 70 operates. When an obstacle that may interfere with the movement is found, the spraying unit 76 is rotated toward the obstacle, and then the water jet is sprayed to remove or cut the obstacle. Since the ejection unit 76 can rotate up, down, left, and right, the obstacle can be removed by spraying the water jet at a position close to the obstacle. The obstacles include braces (steel members) installed to connect adjacent piles 1 to each other, and seaweeds and shellfish attached to the outer surface of the piles 1.

After completing step S30, as shown in FIG. 4, the movable frame 50 is moved along the fixed frame 10 and positioned in the opening 12, and then the water jet unit in a state in which the movable frame 50 is stopped While moving (70) along the moving frame 50, the file (1) is cut (S40). By the movement of the movable frame 50, the movable frame 50 and the fixed frame 10 completely surround the file 1, so that the file 1 can be completely cut.

Whether or not the file cutting operation is completed can be determined by a marine worker by referring to the image captured by the camera and/or the ultrasonic scanning sonar and the moving distance of the water jet unit 70, and the moving distance of the water jet unit 70 It can be calculated by counting the number of revolutions of the driving motor 74.

On the other hand, when the cutting operation is completed, the diver separates the connecting member 21 from the second fixing part 24, inserts the connecting member 21 into the arcuate portion 11, and then cuts the arcuate portion 11 into a file. Separate from (1). Then, the cut pile 1 and the device 100 are lifted by a crane (S50).

On the other hand, in the above, only the process of cutting offshore structure piles using the pile cutting device 100 has been described, but the process of cutting ground structure piles using the pile cutting device 100 can also be performed on the same principle, which is As those skilled in the art can easily understand by referring to this specification, the description will be omitted here.

In addition, although the drawing shows that the fixed frame 10 is installed on the inside and the movable frame 50 is installed on the outside, the movable frame 50 is installed on the inside and the fixed frame 10 may be installed on the outside. Since this structure can be easily understood by those skilled in the art after referring to this specification, the description thereof will be omitted.

10 : fixed frame
11: arc part
12: opening
21: connecting member
22 : long hole
23: first fixing part
24: second fixing part
25: Cylinder
26 : hook
30: bracket
31, 32: roller
33: driving motor
34 : sprocket
40: spacing control unit
41: support
42: nut
43: Jangbong
50: movement frame
51: inner rail
52: outer rail
53: strip
53a: through hole
54: rack gear
55: support plate
70: water jet unit
71: bracket
72: upper guide roller
73: lower guide roller
74: drive motor
75: pinion gear
76: injection part
77: hose
100: file cutting device
θ1: the central angle of the circular arc
θ2: Center angle of moving frame

Claims (8)

It is a method of cutting the pile (1) by spraying a water jet from the outside of the pile (1) supporting a structure on the sea or on the ground,
(a) positioning the file cutting device 100 at the cutting planned point;
(b) fixing the fixing frame 10 to the pile 1 at the cutting planned point;
(c) cutting the file 1 by spraying a water jet while moving the water jet unit 70 along the moving frame 50; and,
(d) moving the moving frame 50 along the fixed frame 10;
(e) after step (d), cutting the pile 1 by spraying a water jet while moving the water jet unit 70 along the moving frame 10;
The fixed frame 10,
An arc portion 11 having an arc shape and movably supporting the moving frame 50; and,
As a part without the arc portion 11, the file 1 is an opening portion 12 that is inserted into the arc portion 11; includes,
In step (d), when the movable frame 50 moves in the circumferential direction along the circular arc portion 11 and is positioned in the open portion 12, the movable frame 50 and the arc portion 11 cooperate to create a file 1 ), a file cutting method using a water jet, characterized in that completely surrounding. According to claim 1,
The structure is a structure installed on the sea,
Remove the superstructure of the offshore structure before step (a),
The step (a) is a file cutting method using a water jet, characterized in that by using a crane to position the file cutting device 100 at the cutting planned point. According to claim 1,
In step (b),
(b1) moving the arc portion 11 so that the file 1 is inserted into the arc portion 11; and,
(b2) fixing the arc portion 11 to the file 1 by using the spacing adjusting unit 40 and ensuring that the distance between the outer surface of the pile 1 and the arc portion 11 is constant; including Characterized in that, a file cutting method using a water jet. According to claim 3,
Between the steps (b1) and (b2) or after the step (b2), the connecting member 21 is used to connect both ends of the arc portion 11 to surround the outer surface of the pile 1 Characterized in that, a file cutting method using a water jet. According to claim 4,
One end of the connecting member 21 is connected to one end of the circular arc part 11 by the first fixing part 23, and the opposite end of the connecting member 21 is connected to the arc part by the second fixing part 24 ( 11) is connected to the opposite end of
The second fixing part 24 includes a cylinder 25, and after the connecting member 21 is fixed to the second fixing part 24, tension is applied to the connecting member 21 by moving the cylinder 25 backward. A file cutting method using a water jet, characterized in that it occurs. According to claim 1,
The moving frame 50,
inner and outer rails 51 and 52 installed to extend along the circumferential direction; and,
A rack gear or strip installed to extend in the circumferential direction on the inner side of the inner rail 51 and the outer side of the outer rail 52,
The rack gear or strip of the inner rail 51 is installed to engage with the pinion gear or sprocket 34 of the driving motor 33, and the moving frame 50 is moved in the circumferential direction by the rotation of the driving motor 33,
The rack gear or strip of the outer rail 52 is installed to engage with the pinion gear 75 or sprocket of the water jet unit 70, and the water jet unit 70 moves in the circumferential direction by rotation of the pinion gear 75 or sprocket. Characterized in that, a file cutting method using a water jet. According to any one of claims 1 to 6,
In the step (c), while the moving frame 50 is fixed to the fixed frame 10, the water jet unit 70 moves along the moving frame 50 and cuts a part of the file 1,
Step (e) cuts the remaining part of the file (1) after step (d),
A file cutting method using a water jet, characterized in that the sum of the central angle (θ1) of the circular arc portion (11) and the central angle (θ2) of the moving frame (50) exceeds 360 °. According to claim 7,
The water jet unit 70,
a spraying unit 76 for spraying a water jet; and,
Including; a camera or ultrasonic scanning sonar for photographing a file or surroundings and transmitting the image signal;
When an obstacle obstructing the operation of the water jet unit 70 is found by a camera or ultrasonic scanning sonar, the spraying unit 76 sprays a water jet to remove the obstacle.

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