Separable offshore plant jacking system

Abstract

This invention provides a separate type offshore plant jacking system that prevents interference between the jacking device and the separated legs. [Solution] The lower unit yoke module and the upper unit yoke module include a jacking pin that is inserted into a pinhole while moving inward by a first actuator or disengaged from a pinhole while moving outward, a yoke frame that is arc-shaped when planar and has the first actuator and jacking pin in its center, and a side coupling flange that is plate-shaped and integral with the yoke frame so as to cover both ends of the yoke frame while protruding at least outward from both ends of the yoke frame, one side coupling flange integral with one end of one yoke frame, and another side coupling flange that abuts with one side coupling flange on another yoke frame arranged adjacent to one yoke frame are formed with a projection groove structure that locks vertically on mutually opposing surfaces.

Description

Technical Field

[0001] The present invention relates to a separable offshore plant jacking system, and particularly to a separable offshore plant jacking system that can maintain a state in which a jacking device and legs are firmly coupled when constructing an offshore platform by a jacking method, and can minimize interference by the separated legs after the construction of the offshore platform.

Background Art

[0002] Generally, an offshore plant refers to all equipment installed in marine spaces such as exploration cones and production facilities necessary for the development of marine resources, as well as marine energy power generation facilities such as offshore wind power and tidal power plants, offshore factories, offshore airports, ship safety facilities, marine observation facilities, and deep-sea resource development facilities. Such offshore plants are classified into fixed-type, floating-type, and deep-sea bottom facilities according to the location of equipment operation.

[0003] Among them, a fixed offshore plant is constructed by moving a floating offshore platform in which a plurality of legs are connected through a jacking device to an installation site, then lowering and fixing the legs to the seabed using the jacking device, and lifting the offshore platform to be separated from the water surface by a certain distance.

[0004] Since a fixed offshore plant in which the legs are supported by the seabed and the offshore platform is separated from the water surface is operated for several years to several decades, the jacking device is no longer used. However, in order to improve the operating efficiency of the jacking device, in the applicant's Korean Patent No. 10-2721767 (hereinafter referred to as the "cited invention"), a jacking device that can be separated from the legs was proposed after the construction of the offshore platform.

[0005] In the cited invention, the legs connected to the offshore platform for construction have clutch rails formed along the longitudinal direction of their outer surface, and are configured to be fixed by the clutches of a jacking device that cross the grooves of the clutch rails. Since the connection between the jacking device and the legs is made on the outside of the legs, research is continuously being conducted on structures that are more stable against external factors.

[0006] Furthermore, after the construction of the offshore platform is completed, the legs are secured to the offshore platform via a separate leg fixing means (device) from the jacking device, and then the jacking device is separated from the offshore platform. However, the leg fixing means are exposed to moisture and salt for long periods outside the offshore platform and are directly affected by external factors such as waves and wind, so continuous maintenance and repair are necessary. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Korean Patent No. 10-2721767 Specification [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The present invention was created to meet the above-mentioned needs, and aims to provide a separable offshore plant jacking system in which, when constructing an offshore platform using a jacking method, there is no concern that the connection between the jacking device and the leg will be weakened by external factors, the jacking module can be easily separated from the leg after the construction of the offshore platform, and when installing other equipment on the offshore platform, interference from the separated leg with the jacking device does not occur.

[0009] Furthermore, the present invention aims to provide a separable offshore plant jacking system in which a device for fixing the legs to the offshore platform is provided inside the offshore platform in order to separate the jacking device, thereby preventing exposure to moisture and salt and the effects of external factors such as waves and wind, and thus enabling operation without continuous maintenance of the leg fixing device. [Means for solving the problem]

[0010] To achieve the above objectives, the offshore platform construction system according to the present invention includes: an offshore platform capable of floating on water; a plurality of legs penetrating the offshore platform in the vertical direction; and a jacking device installed on the offshore platform that can fix the legs after moving them vertically relative to the offshore platform, or fix the offshore platform after moving it vertically relative to legs supported on the seabed; wherein the legs have a plurality of pinholes formed along their length, and the jacking device is installed on the offshore platform and can be coupled to or uncoupled from the legs, and a plurality of them are interconnected and can surround the outside of the offshore platform and adjacent legs. The device includes a lower unit yoke module, an upper unit yoke module which can be connected to or disconnected from a leg at a predetermined distance above the lower unit yoke module and can be interconnected with other units to surround the outside of the leg, and a jacking cylinder which can adjust the length in the vertical direction while connecting the lower unit yoke module and the upper unit yoke module, and each of the lower unit yoke module and the upper unit yoke module is provided with a jacking pin which is inserted into a pinhole while moving inward by a first actuator, or disengaged from a pinhole while moving outward, and a sliding guide device which is restrained to the lower unit yoke module to prevent rotation of the upper unit yoke module.

[0011] Furthermore, each of the lower unit yoke module and the upper unit yoke module includes a yoke frame that is arc-shaped when in plan view and has a first actuator and a jacking pin in its center, and a side coupling flange that is plate-shaped and integral with the yoke frame, covering both ends of the yoke frame while protruding at least outward from both ends of the yoke frame. One side coupling flange integral with one end of one yoke frame and another side coupling flange that abuts against one side coupling flange on another yoke frame arranged adjacent to one yoke frame may be formed by a projection groove structure that locks vertically into mutually opposing surfaces.

[0012] JPEG2026095302000002.jpg45150

[0013] Furthermore, the jack-up cylinder is configured as a hydraulic cylinder including a cylinder tube whose lower end is axially coupled to a lower unit yoke module, and a cylinder rod which moves vertically with a portion of it housed inside the cylinder tube and whose upper end is axially coupled to an upper unit yoke module; and further includes a hydraulic control unit that controls the hydraulic pressure supplied to the jack-up cylinder, wherein the lower end of the cylinder tube and the upper end of the cylinder rod are axially coupled by a fixed shaft that crosses the yoke frame inward and outward, and the hydraulic control unit can control the hydraulic pressure so that the jack-up cylinder can move vertically.

[0014] The offshore platform further includes a plurality of leg support sections that penetrate vertically at intervals set on the frame side and into which the legs are inserted, and a drive space in the form of a partitioned chamber that is in contact with the leg support sections, and a leg fixing device provided in the drive space for fixing the legs; the leg fixing device includes a cylinder block installed in the drive space so as to be in contact with the leg support sections and having through holes formed in the front-rear direction corresponding to the position of the pin holes, a support structure that covers the cylinder block and supports it in accordance with the height of the drive space, a pin block that moves back and forth while inserted into the through holes, with its front end inserted into the pin holes and a fastening portion formed at its rear end, and a second actuator connected to the fastening portion that moves the pin block back and forth.

[0015] Furthermore, the cylinder block has a rectangular parallelepiped shape and is formed horizontally outward, with side support portions protruding from both sides, including a pair of horizontal bottom surfaces spaced apart vertically and a plurality of reinforcing plates connecting the pair of horizontal bottom surfaces; the support structure includes a vertical frame covering each side corner of the cylinder block, and an upper frame and a lower frame coupled to the upper and lower sides of the vertical frame, respectively; and may further include a pair of third actuators positioned in contact with the bottom surface of the drive space and the lower horizontal bottom surface, raising and lowering the cylinder block through length adjustment; and a pair of third actuators positioned in contact with the ceiling surface of the drive space and the upper horizontal bottom surface, raising and lowering the cylinder block through length adjustment.

[0016] Furthermore, the cylinder block is formed with a rectangular parallelepiped outer frame, an inner frame that penetrates in the front-rear direction and forms a through hole consisting of a rear cylinder portion having a first diameter in the rear section and a front cylinder portion having a second diameter smaller than the first diameter in the front section, a vertical support that vertically supports the inner frame, and a horizontal support that horizontally supports the inner frame. The pin block is composed of a rear block having an outer diameter corresponding to the first diameter on the rear side and a front block having an outer diameter corresponding to the second diameter on the front side, the rear block may have a horizontal surface portion that is horizontal on the vertical side, and the front block may have a vertical surface portion that is perpendicular to the left-right side. [Effects of the Invention]

[0017] According to the present invention, when constructing an offshore platform using a jacking method, the jacking pin provided in the jacking device is inserted into a pinhole formed in the leg, thereby connecting the jacking device and the leg. This eliminates concerns that the connection between the jacking device and the leg may be weakened by external factors, and after the construction of the offshore platform, the jacking device can be easily separated from the leg. Furthermore, when installing other equipment on the offshore platform, interference from the leg from which the jacking device has been separated does not occur.

[0018] Furthermore, in order to separate the jacking device, a leg fixing device is installed inside the offshore platform to secure the legs to the offshore platform. This prevents exposure to moisture and salt, as well as the effects of external factors such as waves and wind, so operation is possible without continuous maintenance of the leg fixing device. [Brief explanation of the drawing]

[0019] [Figure 1] This is a perspective view showing an example of a fixed offshore plant constructed using a jacking device applied to the present invention. [Figure 2] This is a coupled perspective view showing a jacking device to which the present invention applies. [Figure 3]It is an exploded perspective view showing a jacking device applied to the present invention. [Figure 4] It is a perspective view showing a state where the jacking device applied to the present invention is fixed to an offshore platform and coupled to a leg. [Figure 5] It is a plan sectional view showing that the jacking device applied to the present invention is coupled to a leg via a jacking pin. [Figure 6] It is a perspective view showing that side coupling flanges of the jacking device applied to the present invention are mutually coupled. [Figure 7] It is a front view showing that a second fixing flange of the jacking device applied to the present invention is coupled to a first fixing flange of an offshore platform. [Figure 8] It is a perspective view showing an example where a fixed offshore plant is constructed through a leg fixing device applied to the present invention. [Figure 9] It is a sectional view showing a state where the leg fixing device applied to the present invention is installed inside an offshore platform. [Figure 10] It is a perspective view showing an example of the leg fixing device applied to the present invention. [Figure 11] It is a perspective view showing another example of the leg fixing device applied to the present invention. [Figure 12] It is a perspective view showing a cylinder block of the leg fixing device applied to the present invention. [Figure 13] It is a perspective view showing a pin block of the leg fixing device applied to the present invention. [Figure 14] It is an illustrative view showing that the height of the cylinder block of the leg fixing device applied to the present invention is adjustable.

Embodiments for Carrying Out the Invention

[0020] The present invention provides an offshore platform that can float on the water; a plurality of legs that penetrate the offshore platform vertically; and a jacking device installed on the offshore platform that can fix the legs after they have been moved vertically relative to the offshore platform, or fix the offshore platform after it has been moved vertically relative to the legs supported on the seabed; wherein the legs have a plurality of pinholes formed along their length, and the jacking device is installed on the offshore platform and can be coupled to or uncoupled from the legs. The proposed separable offshore plant jacking system includes: a lower unit yoke module, of which multiple units are interconnected and can surround the outside of a leg adjacent to an offshore platform; an upper unit yoke module, of which multiple units are interconnected and can surround the outside of a leg, located above the lower unit yoke module at a predetermined distance; and a jacking cylinder, of which length can be adjusted vertically while connecting the lower unit yoke module and the upper unit yoke module; wherein each of the lower unit yoke module and the upper unit yoke module is provided with a jacking pin that is inserted into a pinhole while moving inward by a first actuator, or removed from a pinhole while moving outward.

[0021] The scope of the present invention is not limited to the embodiments described below, and can be implemented in various modified forms by persons with ordinary skill in the art without departing from the technical spirit of the invention.

[0022] The separation-type offshore plant jacking system according to the present invention will be described in detail below with reference to the attached Figures 1 to 14.

[0023] The separable offshore plant jacking system according to the present invention basically includes an offshore platform 100, legs 200, and a jacking device 300, as shown in Figure 1.

[0024] The offshore platform 100 is a structure that can float on water and can be manufactured in various forms such as plate-shaped or cylindrical. It is preferable that the structure be designed to allow for mobility from land to sea, as well as to ensure safety and economic efficiency when installed at sea. As an example, the offshore platform 100 may include a plurality of leg support sections 120 that penetrate vertically at intervals set on the frame side and into which the legs 200 are inserted, and a drive space 130 in the form of a partitioned chamber that is in contact with the leg support sections 120.

[0025] As shown in Figure 1, the leg 200 penetrates the offshore platform 100 vertically and supports the offshore platform 100, and the offshore platform 100 can be supported by multiple legs 200. For example, the leg 200 is in the form of a straight circular pipe, and a spud can for installation on the seabed may be provided at its lower end. In this case, the leg 200 has a length such that its upper end is located above the offshore platform 100, which is positioned above the water surface when the spud can is placed on the seabed rock layer. Multiple pinholes 210 are formed in such a leg 200 at regular intervals along its length, and a jacking device 300 and / or a leg fixing device 400, described later, can be connected to the leg 200 using the pinholes 210. Multiple pinholes 210 may be formed in three rows at 120° intervals on the leg 200, but are not necessarily limited to this, and the number of rows formed by the multiple pinholes 210 may vary depending on the size of the offshore platform 100 and the shape of the leg 200.

[0026] As shown in Figure 1, the jacking device 300 is installed on the offshore platform 100 and is configured to connect the offshore platform 100 and the leg 200. The device is configured to either move the leg 200 vertically relative to the offshore platform 100 and then fix it in place while the offshore platform 100 and the leg 200 are connected, or to move the offshore platform 100 vertically relative to the leg 200 supported on the seabed and then fix it in place.

[0027] In particular, the jacking device 300 of the present invention is configured to allow connection to or disconnection from the leg 200 using a pinhole 210 formed in the leg 200, and includes a lower unit yoke module 310a, an upper unit yoke module 310b, and a jack-up cylinder 320, as shown in Figures 2 to 4.

[0028] The lower unit yoke module 310a is coupled to the upper surface of the offshore platform 100 and is configured to be able to be coupled to or uncoupled from the legs 200 located inside it. Such a lower unit yoke module 310a has multiple interconnected ends and is provided so as to surround the upper surface of the offshore platform 100 and the outside of the adjacent legs 200 in the legs 200 that penetrate the offshore platform 100. As shown in Figures 2 to 5, the lower unit yoke module 310a of the present invention is provided with a jacking pin 312 that can be coupled to a pinhole 210 of the leg 200. The jacking pin 312 is inserted into the pinhole 210 while being moved inward by a first actuator 311 provided on the outside of the lower unit yoke module 310a, thereby coupling the leg 200 and the lower unit yoke module 310a. The coupling between the leg 200 and the lower unit yoke module 310a can be released by moving outward by the first actuator 311 while inserted into the pinhole 210, thereby releasing the pin from the pinhole 210.

[0029] The upper unit yoke module 310b is located above the lower unit yoke module 310a at a predetermined distance and is configured to be able to connect to or disconnect from the leg 200 located inside it. Similar to the lower unit yoke module 310a, multiple such upper unit yoke modules 310b are interconnected and arranged to surround the outside of the leg 200. Furthermore, as shown in Figures 2 to 5, the upper unit yoke module 310b of the present invention is provided with a jacking pin 312 that can be coupled to a pinhole 210 of the leg 200. The jacking pin 312 is inserted into the pinhole 210 while being moved inward by a first actuator 311 provided on the outside of the upper unit yoke module 310b, thereby coupling the leg 200 and the upper unit yoke module 310b. The coupling between the leg 200 and the upper unit yoke module 310b can be released by moving outward by the first actuator 311 while inserted into the pinhole 210, thereby releasing the leg 200 from the pinhole 210.

[0030] Thus, the jacking device 300 is connected to the leg 200 by the insertion of jacking pins 312 provided in the lower unit yoke module 310a and jacking pins 312 provided in the upper unit yoke module 310b through pinholes 210 formed in the leg 200. Therefore, when constructing the offshore platform 100 using the jacking method, there is no concern that the connection between the jacking device 300 and the leg 200 may be weakened by external factors. Furthermore, after the construction of the offshore platform 100 is completed, the jacking device 300 can be easily separated from the leg 200 by separating the multiple lower unit yoke modules 310a and the multiple upper unit yoke modules 310b, whose ends are interconnected, as shown in Figure 3. In addition, since the leg 200 from which the jacking device 300 has been separated does not include any externally protruding components such as clutch rails, no interference occurs when other devices are installed on the offshore platform 100.

[0031] The lower unit yoke module 310a and the upper unit yoke module 310b described above may each include, as shown in Figures 2 and 3, a yoke frame 313 which is arc-shaped when in plan view and has a first actuator 311 and a jacking pin 312 in its center, and a plate-shaped side coupling flange 314 which is integral with the yoke frame 313 and covers both ends of the yoke frame 313 while protruding at least outward from both ends of the yoke frame 313.

[0032] For example, the yoke frame 313 may be formed to surround the outside of the leg 200, which is in the form of a circular tube (pipe), by 120°. A first actuator 311 may be provided on the outside of the central part, and a jacking pin 312 may be provided on the inside of the central part so as to protrude inward by the first actuator 311. Furthermore, for example, the lower unit yoke module 310a may be provided integrally with the yoke frame 313 such that the side coupling flange 314 protrudes from one end (other end) of the yoke frame 313 at least outward and downward, covering one end (other end) of the yoke frame 313. Furthermore, the upper unit yoke module 310b may be provided integrally with the yoke frame 313 such that the side coupling flange 314 protrudes from one end (other end) of the yoke frame 313 at least outward and upward, covering one end (other end) of the yoke frame 313.

[0033] In this case, one side connecting flange 314 that is integral with one end (or the other end) of one yoke frame 313, and another side connecting flange 314 of another yoke frame 313 that is positioned adjacent to the one yoke frame 313 and is in contact with the one side connecting flange 314, can be connected to each other by bolting the portions that protrude at least outward from the yoke frame 313 while in contact with each other.

[0034] JPEG2026095302000003.jpg89150

[0035] JPEG2026095302000004.jpg115150

[0036] In addition, the second fixing flange 315 is formed to be separated from the upper surface of the offshore platform 100 when coupled with the first fixing flange 110, thereby minimizing the impact on the leg 200 of vibrations transmitted through the offshore platform 100 due to work on the offshore platform 100. Furthermore, the first fixing flange 110 and the second fixing flange 315 may be provided with support reinforcement pieces that are arranged longitudinally separated on non-facing surfaces and connected to the upper surface of the offshore platform 100 and the bottom surface of the lower unit yoke module 310a.

[0037] On the other hand, the jack-up cylinder 320 is configured to allow vertical length adjustment while connecting the lower unit yoke module 310a and the upper unit yoke module 310b described above. The connection between one lower unit yoke module 310a and the upper unit yoke module 310b can be performed via one jack-up cylinder 320, but it is preferable that the connection be performed via multiple jack-up cylinders 320 so that either the lower unit yoke module 310a or the upper unit yoke module 310b can move stably when the jack-up cylinder 320 is operated.

[0038] The jack-up cylinder 320 may, for example, include a cylinder tube 321 whose lower end is coupled to the lower unit yoke module 310a, and a cylinder rod 322 which moves vertically with a portion of it housed inside the cylinder tube 321, and whose upper end is coupled to the upper unit yoke module 310b, and may be configured as a hydraulic cylinder in which the vertical movement of the cylinder rod 322 is performed by hydraulic pressure. Furthermore, it is preferable that the upper and lower ends of the jack-up cylinder 320 are axially coupled so that it can move stably in the vertical direction even when lateral vibration occurs due to the movement of the leg 200 or lateral vibration due to work on the offshore platform 100, and so that the connection between the lower unit yoke module 310a and the upper unit yoke module 310b is firmly maintained. Specifically, the lower end of the cylinder tube 321 is axially connected by a fixed shaft 316 that crosses the yoke frame 313 constituting the lower unit yoke module 310a from inside to outside, and the upper end of the cylinder rod 322 can be axially connected by a fixed shaft 316 that crosses the yoke frame 313 constituting the upper unit yoke module 310b from inside to outside.

[0039] Furthermore, if the jack-up cylinder 320 is a hydraulic cylinder, the present invention may further include a hydraulic control unit that controls the hydraulic pressure supplied to the jack-up cylinder 320. The hydraulic control unit can control the hydraulic pressure to drive the jack-up cylinder 320 in the forward direction (increasing the length) or in the reverse direction (decreasing the length). The hydraulic control unit may also include a vibration induction switching module, which causes the hydraulic control for forward and reverse driving of the jack-up cylinder 320 to switch at a rapid cycle. This allows the jack-up cylinder 320 to move vertically, and such a function may be used when driving the lower end of the leg 200 into the seabed.

[0040] On the other hand, considering that the jacking device 300 will not be used for a long period after the construction of the offshore platform 100 is completed, the jacking device 300 can be separated from the offshore platform 100 and the leg 200 to increase the utilization rate of the jacking device 300. In this case, the present invention may further include a leg fixing device 400 so that a firm connection between the offshore platform 100 and the leg 200 can be maintained even in the absence of the jacking device 300.

[0041] As shown in Figures 8 and 9, the leg fixing device 400 is a device for fixing the leg 200 to the offshore platform 100. Unlike the jacking device 300, which is installed outside the offshore platform 100, the leg fixing device 400 is installed inside the offshore platform 100. This not only ensures that the leg 200 is firmly fixed even after the removal of the portable jacking device 300, but also prevents exposure to moisture and salt, as well as the effects of external factors such as waves and wind. Therefore, operation is possible without continuous maintenance of the leg fixing device 400.

[0042] As shown in Figure 9, such a leg fixing device 400 may include, as its main components, a cylinder block 410, a support structure 420, a pin block 430, and a second actuator 440.

[0043] The cylinder block 410 is installed in the drive space 130 so as to be in contact with the leg support portion 120, and a through hole 411 is formed in the front-rear direction corresponding to the position of the pinhole 210.

[0044] As an example, the cylinder block 410, as shown in Figures 9 to 12, has a rectangular parallelepiped shape and may have two through holes 411 formed on its upper and lower sides. The through holes 411 are configured so that pin blocks 430 can be inserted so as to be slidable in the front-rear direction, and the legs 200 can be supported through the two pin blocks 430. After supporting the legs 200, the pin blocks 430 are subjected to forces substantially due to the load of the offshore platform 100, so it is preferable to have a sufficient number of through holes 411 and pin blocks 430 to withstand these forces, and the size of the cylinder block 410 and the number of through holes 411 provided may vary depending on the size and weight of the offshore platform 100 and the size of the legs 200.

[0045] As a specific example, the leg 200 is cylindrical in shape, and pinholes 210 are formed in three rows vertically at 120° intervals with respect to the horizontal cross-section. Correspondingly, the leg fixing device 400, including the cylinder block 410, can be positioned to face the leg 200 in three directions corresponding to the positions of the pinholes 210. Through this structure, two pin blocks 430 are inserted into each cylinder block 410, so each leg 200 is supported by a total of six pin blocks 430 in three directions. A total of three leg fixing devices 400 form one set, and a total of three sets can provide firm fixing and support while distributing the load of the offshore platform 100.

[0046] JPEG2026095302000005.jpg77150

[0047] As shown in Figures 9 and 13, the pin block 430 moves back and forth while inserted into the through hole 411, with its front end inserted into the pinhole 210 and a fastening portion 431 formed at its rear end that connects to the second actuator 440. The second actuator 440 is configured to move the pin block 430 back and forth by having one end connected to the fastening portion 431 and the other end fixed to the drive space 130. The second actuator 440 can be configured as a cylinder whose length changes with drive, and in particular as a hydraulic cylinder to smoothly move the relatively heavy pin block 430 back and forth, and is preferably controlled so that the leg 200 can be firmly fixed by coordinated operation with the jacking device (or means) 300 during the raising and lowering of the leg 200. Thus, the second actuator 440 needs to be hinged to the pin block 430 and the drive space 130 as its length changes, and the fastening portion 431 can be configured in a pad eye form.

[0048] As a specific example, the cylinder block 410, as shown in Figure 12, is subjected to a considerable load together with the pin block 430. Therefore, in order to appropriately distribute such loads and maintain its shape, it is composed of a rectangular parallelepiped outer frame 413, an inner frame 414 that penetrates in the front-rear direction and forms a through hole 411 consisting of a rear cylinder portion 414a having a first diameter in the rear section and a front cylinder portion 414b having a second diameter smaller than the first diameter in the front section, a vertical support 415 that vertically supports the inner frame 414, and a horizontal support 416 that horizontally supports the inner frame 414.

[0049] As shown in Figure 12, the cylinder block 410 has two internal frames 414 formed in the vertical direction, and each internal frame 414 is connected to the external frame 413 via horizontal supports 416 on its side. Furthermore, the upper side of the upper internal frame 414, the lower side of the lower internal frame 414, and the spaces between the internal frames 414 are interconnected via vertical supports 415, thereby supporting the load and preventing deformation of the shape.

[0050] Corresponding to the shape of the internal frame 414, the pin block 430 is integrally constructed as shown in Figure 13, with a rear block 432 having an outer diameter corresponding to the first diameter on the rear side and a front block 433 having an outer diameter corresponding to the second diameter on the front side. Furthermore, a portion of the horizontal surface 432a is formed on the upper and lower sides of the rear block 432, and a portion of the vertical surface 433a is formed on the left and right sides of the front block 433, thereby enabling more effective load support and prevention of deformation compared to a perfectly circular shape. Lubricating oil is injected and maintained between the horizontal surface 432a and the vertical surface 433a and the inner walls of the front cylinder portion 414b and the rear cylinder portion 414a, preventing seizing even when the fixed state is maintained for a long period of time.

[0051] On the other hand, the offshore platform 100 and legs 200 are structures with considerable load and size, and there is a great concern that they will undergo deformation due to their own weight and various marine environments. In particular, when the legs 200 are supported through the cylinder block 410 and pin block 430, even very small deformations or twists in the offshore platform 100 and legs 200 can cause the movement of the pin block 430 to become irregular. In this case, an impact applied from the outside to move the pin block 430 can cause damage or deformation to the pin block 430 and cylinder block 410, worsening the situation.

[0052] JPEG2026095302000006.jpg35169

[0053] Furthermore, as shown in Figure 14(a), a third actuator 450 may be provided inside the drive space 130, which is in contact with the horizontal bottom surface 412a and raises and lowers the cylinder block 410 through length adjustment. The third actuator 450 is a hydraulic cylinder capable of supporting a large load, and by installing the same horizontal bottom surfaces 412a on both the upper and lower sides of the side support portion 412, the third actuator 450 can be selectively installed between the lower horizontal bottom surface 412a and the bottom surface of the drive space 130 or between the upper horizontal bottom surface 412a and the ceiling surface of the drive space 130. In addition, the cylinder block 410 applies a downward force to the bottom surface of the drive space 130 due to its load, but when the pin block 430 is inserted into the pinhole 210, the load of the offshore platform 100 applies a force to the cylinder block 410 that pushes upward to the ceiling surface of the drive space 130. Therefore, it is preferable that the third actuator 450 be installed on both the upper and lower sides of the side support portion 412.

[0054] Along with this, spacers 424 may be provided that are inserted into the upper frame 422 and the lower frame 423 to support the cylinder block 410. As shown in Figure 14(b), the upper frame 422 and the lower frame 423 may be provided with insertion parts 425 into which the spacers 424 can be inserted and then removed. The spacer 424 inserted into the upper frame 422 receives the load between the cylinder block 410 and the ceiling surface of the drive space 130, and the spacer 424 inserted into the lower frame 423 receives the load between the cylinder block 410 and the bottom surface of the drive space 130.

[0055] The spacer 424 may be a metal plate with a set thickness that can withstand heavy loads. By adjusting the number of spacers 424 inserted, the cylinder block 410 can be moved vertically, effectively addressing the problematic situations mentioned above. [Explanation of symbols]

[0056] 100 Offshore Platforms 110 First fixed flange 120 Leg support section 130 Drive space 200 legs 210 pinholes 300 Jacking device 310a Lower Unit Yoke Module 310b Upper unit yoke module 311 First actuator 312 Jacking pins 313 York Frame 314 Side coupling flange 315 Second fixed flange 316 Fixed axis 320 Jack-up Cylinder 321 Cylinder tube 322 Cylinder rod 400 Leg Restraint Device 410 Cylinder Block 411 Through hole 412 Side support part 412a horizontal bottom 412b Reinforcement plate 413 External frame 414 Internal frame 414a Rear cylinder section 414b Front cylinder section 415 Vertical Support 416 Horizontal support 420 Support Structure 421 Vertical Frame 422 Upper frame 423 Lower frame 424 Spacer 425 Insertion part 430 Pin Block 431 Fastening section 432 Rear block 432a Horizontal part 433 Front block 433a Vertical surface section 440 Second actuator 450 Third actuator

Claims

1. A floating offshore platform (100) Multiple legs (200) penetrating the offshore platform (100) in the vertical direction; and The system includes a jacking device (300) installed on the offshore platform (100) that can move the legs (200) vertically relative to the offshore platform (100) and then fix them, or move the offshore platform (100) vertically relative to the legs (200) supported on the seabed and then fix them, The leg (200) has a plurality of pinholes (210) formed along its length. The jacking device (300) is A lower unit yoke module (310a) is installed on the offshore platform (100), can be connected to or disconnected from the leg (200), multiple units of which are interconnected, and can surround the outside of the leg (200) adjacent to the offshore platform (100). An upper unit yoke module (310b) is located above the lower unit yoke module (310a) at a predetermined distance, and can be connected to or disconnected from the leg (200). Multiple upper unit yoke modules (310b) are interconnected and can surround the outside of the leg (200). The system includes a jack-up cylinder (320) that allows for vertical length adjustment while connecting the lower unit yoke module (310a) and the upper unit yoke module (310b), Each of the lower unit yoke module (310a) and the upper unit yoke module (310b) is provided with a jacking pin (312) that moves inward and is inserted into a pinhole (210) by a first actuator (311), or moves outward and is removed from the pinhole (210). Each of the lower unit yoke module (310a) and the upper unit yoke module (310b) is, The device includes a yoke frame (313) which is arc-shaped when in a planar position and has a first actuator (311) and a jacking pin (312) in its central part, and a side coupling flange (314) which is plate-shaped and integral with the yoke frame (313) so as to cover both ends of the yoke frame (313) while projecting at least outward from both ends of the yoke frame (313), A separable offshore plant jacking system characterized in that one side coupling flange (314) is integral with one end of one yoke frame (313), and another side coupling flange (314) of another yoke frame (313) positioned adjacent to one yoke frame (313) is formed with a projection groove structure that locks vertically into mutually opposing surfaces.

2.

3. The jack-up cylinder (320) is configured as a hydraulic cylinder including a cylinder tube (321) whose lower end is axially coupled to a lower unit yoke module (310a), and a cylinder rod (322) which moves vertically with a portion of it housed inside the cylinder tube (321), and whose upper end is axially coupled to an upper unit yoke module (310b). A hydraulic control unit for controlling the hydraulic pressure supplied to the jack-up cylinder (320); further includes The lower end of the cylinder tube (321) and the upper end of the cylinder rod (322) are axially connected by a fixed shaft (316) that crosses the yoke frame (313) both internally and externally. The separate type offshore plant jacking system according to claim 1, characterized in that the hydraulic control unit can control the hydraulic pressure so that the jack-up cylinder (320) can move in the vertical direction.

4. The offshore platform (100) includes a plurality of leg support sections (120) that penetrate vertically at intervals set on the frame side and into which the legs (200) are inserted, and a drive space (130) in the form of a partitioned chamber that is in contact with the leg support sections (120). The system further includes a leg fixing device (400) provided within the drive space (130) for fixing the leg (200); The leg fixing device (400) is A cylinder block (410) is installed in the drive space (130) so as to be in contact with the leg support portion (120), and a through hole (411) in the front-rear direction is formed corresponding to the position of the pinhole (210), A support structure (420) covers the cylinder block (410) and supports it in accordance with the height of the drive space (130), A pin block (430) moves back and forth while inserted into the through hole (411), with its front end inserted into a pinhole (210) and a fastening portion (431) formed at its rear end, The separable offshore plant jacking system according to claim 1, further comprising a second actuator (440) connected to the fastening portion (431) and for moving the pin block (430) back and forth.

5. The cylinder block (410) has a rectangular parallelepiped shape and has side support portions (412) protruding from both sides, which include a pair of horizontal bottom surfaces (412a) formed horizontally outward and spaced apart vertically, and a plurality of reinforcing plates (412b) connecting the pair of horizontal bottom surfaces (412a). The support structure (420) includes vertical frames (421) that cover the side corners of the cylinder block (410), and upper frames (422) and lower frames (423) that are connected to the upper and lower sides of the vertical frames (421), respectively. The separable offshore plant jacking system according to claim 4, further comprising: a pair of third actuators (450) provided so as to be in contact with the bottom surface of the drive space (130) and the lower horizontal bottom surface (412a), which raise and lower the cylinder block (410) through length adjustment; and a pair of third actuators (450) provided so as to be in contact with the ceiling surface of the drive space (130) and the upper horizontal bottom surface (412a), which raise and lower the cylinder block (410) through length adjustment.

6. The cylinder block (410) is formed of an outer frame (413) in the shape of a rectangular parallelepiped, an inner frame (414) that penetrates in the front-rear direction and forms a through hole (411) consisting of a rear cylinder portion (414a) having a first diameter in the rear section and a front cylinder portion (414b) having a second diameter smaller than the first diameter in the front section, a vertical support (415) that vertically supports the inner frame (414), and a horizontal support (416) that horizontally supports the inner frame (414). The pin block (430) is composed of a rear block (432) having an outer diameter corresponding to a first diameter on the rear side, and a front block (433) having an outer diameter corresponding to a second diameter on the front side. The rear block (432) has horizontal surfaces (432a) that are horizontal on the upper and lower sides. The separation-type offshore plant jacking system according to claim 4, characterized in that the front block (433) has vertical surfaces (433a) that are perpendicular to the left and right sides.

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