Separated offshore plant jacking system

Abstract

To provide a separate type marine plant jacking system in which interference between a jacking device and a separated leg does not occur. [Solution] The lower unit yoke module and the upper unit yoke module include a jacking pin that moves inward by a first actuator to be inserted into a pinhole or moves outward to remove from the pinhole, a yoke frame that is arc-shaped when viewed from above and has the first actuator and jacking pin at its center, and plate-shaped side connecting flanges that protrude at least outward from both ends of the yoke frame and are integral with the yoke frame to cover both ends of the yoke frame, and one side connecting flange that is integral with one end of one yoke frame and the other side connecting flange that abuts against the one side connecting flange on another yoke frame arranged adjacent to the one yoke frame are formed with a protrusion-groove structure that engages in the vertical direction on mutually facing surfaces.

Description

[Technical Field]

[0001] The present invention relates to a separate-type offshore plant jacking system, and more particularly, to a separate-type offshore plant jacking system that can maintain a tightly coupled state between a jacking device and legs when constructing an offshore platform using a jacking method, and minimize interference caused by separated legs with the jacking device after the offshore platform is constructed. [Background technology]

[0002] Generally, an offshore plant refers to all facilities installed in the ocean space, including drilling and production facilities necessary for the development of marine resources, marine energy power generation facilities such as offshore wind and tidal power plants, offshore factories, offshore airports, ship safety facilities, marine observation facilities, and deep-sea resource development facilities. These offshore plants are classified into fixed, floating, and deep-sea facilities depending on the location of their operation.

[0003] Among these, fixed offshore plants are constructed by moving a floating offshore platform, to which multiple legs are connected via a jacking device, to the installation site, lowering the legs to the seabed using the jacking device and fixing them in place, and then lifting the offshore platform a certain distance above the water surface.

[0004] Fixed offshore plants, in which the legs are supported on the seabed and the offshore platform is separated from the water surface, are operated for several years or even several decades, and therefore do not require a jacking device. However, in order to improve the operational efficiency of the jacking device, the applicant's Korean Patent No. 10-2721767 (hereinafter referred to as the "cited invention") proposed a jacking device that can be separated from the legs after the offshore platform is constructed.

[0005] In the cited invention, the legs that are connected to the offshore platform for constructing it have a clutch rail with a concave and convex shape along the length of the outer periphery, and are configured to be fixed by the clutch of the jacking device that crosses the groove of the clutch rail. Because the connection between the jacking device and the legs is made on the outside of the legs, research is ongoing to develop a structure that is more stable against external factors.

[0006] In addition, after the construction of the offshore platform is completed, the legs are fixed to the offshore platform using a leg fixing means (device) separate from the jacking device, and then the jacking device is separated from the offshore platform. However, the leg fixing means is exposed to moisture and salt for a long period of time outside the offshore platform and is directly affected by external factors such as waves and wind, so it requires continuous maintenance and repair. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent No. 10-2721767 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention was created in response to the above-mentioned needs, and aims to provide a detachable offshore plant jacking system that eliminates the concern that the connection between the jacking device and the legs will be weakened by external factors when constructing an offshore platform using a jacking method, allows the jacking module to be easily detached from the legs after the offshore platform is constructed, and prevents interference from the detached legs when installing other equipment on the offshore platform.

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

[0010] In order to achieve the above object, the offshore platform construction system of the present invention includes an offshore platform that can float on water; a plurality of legs that penetrate the offshore platform in the vertical direction; and a jacking device that is installed on the offshore platform and can move the legs in the vertical direction based on the offshore platform and then fix them, or move the offshore platform in the vertical direction based on the legs supported on the seabed and then fix them; wherein a plurality of pinholes are formed in the legs along their length, and the jacking device is installed on the offshore platform and can be coupled to or released from the legs, and a plurality of the jacking devices can be coupled to each other and can surround the outside of the offshore platform and adjacent legs. and a jacking cylinder whose length in the vertical direction is adjustable while connecting the lower unit yoke module and the upper unit yoke module. The jacking cylinder is provided with a jacking pin that moves inwardly and is inserted into a pinhole or moves outwardly and is released from the pinhole by a first actuator, and includes a sliding guide device that is constrained to the lower unit yoke module to prevent rotation of the upper unit yoke module.

[0011] In addition, each of the lower unit yoke module and the upper unit yoke module includes a yoke frame that is arc-shaped when viewed in plan and has a first actuator and a jacking pin at its center, and plate-shaped side connecting flanges that are integral with the yoke frame and protrude at least outward from both ends of the yoke frame to cover both ends of the yoke frame. One side connecting flange that is integral with one end of one yoke frame and another side connecting flange that abuts against the one side connecting flange of another yoke frame arranged adjacent to the one yoke frame may have a protrusion-groove structure that engages with each other in the vertical direction on opposing surfaces.

[0012] JPEG0007742083000002.jpg45150

[0013] In addition, the jack-up cylinder is configured as a hydraulic cylinder including a cylinder tube whose lower end is axially connected to the lower unit yoke module, and a cylinder rod whose upper end is axially connected to the upper unit yoke module while being partially housed inside the cylinder tube and moves up and down, and further includes a hydraulic control unit that controls 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 connected by a fixed shaft that crosses the yoke frame inward and outward, and the hydraulic control unit can control hydraulic pressure so that the jack-up cylinder can move up and down.

[0014] The offshore platform further includes a plurality of leg support sections that penetrate the frame side in the vertical direction at set intervals and into which legs are inserted, a drive space in the form of a compartment adjacent to the leg support sections, and a leg fixing device that is provided in the drive space and fixes the legs, and the leg fixing device includes: a cylinder block that is installed in the drive space so as to be in contact with the leg support sections and has a through hole formed in the front-rear direction corresponding to the position of the pin hole; a support structure that covers the cylinder block and supports it according to the height of the drive space; a pin block that moves back and forth while inserted into the through hole, and has a front end that is inserted into the pin hole and a fastening section formed at a rear end; and a second actuator that is connected to the fastening section and moves the pin block back and forth.

[0015] The cylinder block may have a rectangular parallelepiped shape and have side support parts protruding from both sides thereof, the side support parts including a pair of horizontal bottom surfaces spaced apart from each other above and below, and a plurality of reinforcing plates connecting the pair of horizontal bottom surfaces. The support structure may further include vertical frames covering side corners of the cylinder block, and upper and lower frames coupled to the upper and lower sides of the vertical frames, the support structure being in contact with the bottom surface and the lower horizontal bottom surface of the driving space and adjusting its length to raise and lower the cylinder block, and a pair of third actuators being in contact with the ceiling surface and the upper horizontal bottom surface of the driving space and adjusting its length to raise and lower the cylinder block.

[0016] The cylinder block may include a rectangular parallelepiped outer frame, an inner frame that penetrates in the front-rear direction and forms a through hole with a rear cylindrical portion having a first diameter in a rear section and a front cylindrical portion having a second diameter smaller than the first diameter in a front section, a vertical support that vertically supports the inner frame, and a horizontal support that horizontally supports the inner frame. The pin block may include a rear block on its rear side having an outer diameter corresponding to the first diameter and a front block on its front side having an outer diameter corresponding to the second diameter. The rear block may have horizontal planes that are horizontal on the top and bottom sides, and the front block may have vertical planes that are vertical on the left and right sides. [Effects of the Invention]

[0017] According to the present invention, when constructing an offshore platform using a jacking method, the jacking pin provided on the jacking device is inserted into a pinhole formed in the leg to connect the jacking device to the leg, so there is no need to worry about the connection between the jacking device and the leg being weakened by external factors, and after the offshore platform is constructed, the jacking device can be easily separated from the leg, so that when other equipment is installed on the offshore platform, no interference occurs due to the leg from which the jacking device has been separated.

[0018] In addition, a leg fixing device that fixes the legs to the offshore platform to separate the jacking device is installed inside the offshore platform, preventing exposure to moisture and salt and the effects of external factors such as waves and wind, so the leg fixing device can be operated without continuous maintenance and repair. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view showing an example of a fixed marine plant constructed using a jacking device applied to the present invention. FIG. [Figure 2] 1 is a perspective view showing an assembly of a jacking device applied to the present invention. [Figure 3]1 is an exploded perspective view showing a jacking device applied to the present invention. [Figure 4] 1 is a perspective view showing a state in which a jacking device applied to the present invention is fixed to an offshore platform and coupled with a leg. FIG. [Figure 5] 1 is a cross-sectional plan view showing a jacking device applied to the present invention coupled via a leg and a jacking pin. FIG. [Figure 6] 1 is a perspective view showing how side coupling flanges of a jacking device applied to the present invention are coupled to each other; FIG. [Figure 7] FIG. 10 is a front view showing the second fixing flange of the jacking device applied to the present invention and the first fixing flange of the offshore platform being coupled together. [Figure 8] 1 is a perspective view showing an example of a fixed marine plant constructed using a leg fixing device applied to the present invention. FIG. [Figure 9] 1 is a cross-sectional view showing a state in which a leg fixing device applied to the present invention is installed inside an offshore platform. [Figure 10] 1 is a perspective view showing an example of a leg fixing device applied to the present invention. [Figure 11] FIG. 10 is a perspective view showing another example of a leg fixing device applied to the present invention. [Figure 12] 1 is a perspective view showing a cylinder block of a leg fixing device applied to the present invention. FIG. [Figure 13] FIG. 1 is a perspective view showing a pin block of a leg fixing device applied to the present invention. [Figure 14] 10 is an exemplary view showing that the height of the cylinder block of the leg fixing device applied to the present invention is adjustable; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention includes an offshore platform that can float on water so that the jacking device and legs can be firmly connected when constructing an offshore platform by jacking and so that interference between the jacking device and the legs can be minimized after the construction of the offshore platform due to the separated legs; a plurality of legs that vertically penetrate the offshore platform; and a jacking device that is installed on the offshore platform and can move the legs vertically based on the offshore platform and then fix them, or move the offshore platform vertically based on the legs supported on the seabed and then fix them; and a plurality of pinholes are formed in the legs along their length, and the jacking device is installed on the offshore platform and can be connected to or disconnected from the legs. the lower unit yoke modules are connected to each other in plurality to surround the outside of the legs adjacent to the offshore platform; upper unit yoke modules are spaced a predetermined distance above the lower unit yoke modules and can be connected to or disconnected from the legs, the upper unit yoke modules are connected to each other in plurality to surround the outside of the legs; and a jacking cylinder that connects the lower unit yoke modules and the upper unit yoke modules and whose length in the vertical direction is adjustable, and each of the lower unit yoke modules and the upper unit yoke modules is provided with a jacking pin that moves inward by a first actuator to be inserted into a pinhole or moves outward by a first actuator to be removed from the pinhole.

[0021] The scope of the present invention is not limited to the examples described below, and may be modified and implemented in various ways by those skilled in the art within the scope of the technical gist of the present invention.

[0022] Hereinafter, a separate type offshore plant jacking system according to the present invention will be described in detail with reference to the accompanying Figs. 1 to 14.

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

[0024] The offshore platform 100 is a structure that can float on water and can be manufactured in various shapes such as a plate shape or a cylindrical shape, and is preferably constructed in consideration of mobility from land to sea, safety and economy when installed on sea. For example, the offshore platform 100 may include a plurality of leg support parts 120 that penetrate the frame side in the vertical direction at set intervals and into which the legs 200 are inserted, and a chamber-shaped drive space 130 adjacent to the leg support parts 120.

[0025] As shown in FIG. 1 , the leg 200 is configured to vertically penetrate the offshore platform 100 and support the offshore platform 100, and the offshore platform 100 may be supported by a plurality of legs 200. For example, the leg 200 may be in the form of a straight circular pipe, with a spud can attached to the bottom end for installation on the seabed. In this case, the leg 200 has a length such that the upper end is located above the offshore platform 100, which is located above the water surface, when the spud can is placed on the seabed bedrock. A plurality of pinholes 210 are formed at regular intervals along the length of the leg 200, and a jacking device 300 and / or a leg fixing device 400, which will be described later, may be coupled to the leg 200 using the pinholes 210. The plurality of pinholes 210 may be formed in three rows at 120° intervals in the leg 200, but this is not necessarily limited to this, and the number of rows of the plurality of pinholes 210 may vary depending on the size of the offshore platform 100 and the shape of the leg 200, etc.

[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.When the offshore platform 100 and the leg 200 are connected, the leg 200 can be moved up and down based on the offshore platform 100 and then fixed, or the offshore platform 100 can be moved up and down based on the leg 200 supported on the seabed and then fixed.

[0027] In particular, the jacking device 300 of the present invention is configured to be capable of coupling to or uncoupling 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 capable of coupling to or uncoupling from the leg 200 located inside. The lower unit yoke module 310a is installed to surround the outer side of the leg 200 adjacent to the upper surface of the offshore platform 100, in the leg 200 having a plurality of ends coupled to each other and penetrating 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 the pin hole 210 of the leg 200. The jacking pin 312 can be inserted into the pin hole 210 while moving 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. While inserted into the pin hole 210, the jacking pin 312 can be moved outward by the first actuator 311 and removed from the pin hole 210, thereby releasing the coupling between the leg 200 and the lower unit yoke module 310a.

[0029] The upper unit yoke module 310b is disposed above the lower unit yoke module 310a at a predetermined distance and configured to be coupled to or uncoupled from the leg 200 located inside. Similar to the lower unit yoke module 310a, a plurality of upper unit yoke modules 310b are coupled to each other and are disposed to surround the outside of the leg 200. 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 the pin hole 210 of the leg 200. The jacking pin 312 can be inserted into the pin hole 210 while moving 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. While inserted into the pin hole 210, the jacking pin 312 can be moved outward by the first actuator 311 and removed from the pin hole 210, thereby releasing the coupling between the leg 200 and the upper unit yoke module 310b.

[0030] As described above, the jacking device 300 is coupled to the legs 200 by inserting the jacking pins 312 provided on the lower unit yoke modules 310a and the jacking pins 312 provided on the upper unit yoke modules 310b through the pinholes 210 formed in the legs 200. Therefore, when constructing the offshore platform 100 using a jacking method, there is no need to worry about the coupling between the jacking device 300 and the legs 200 being weakened by external factors. Furthermore, after construction of the offshore platform 100 is completed, the jacking device 300 can be easily separated from the legs 200 by separating the plurality of lower unit yoke modules 310a, whose ends are connected to each other, from the plurality of upper unit yoke modules 310b, whose ends are connected to each other, as shown in FIG. 3. In addition, the legs 200 from which the jacking device 300 has been separated do not include any protruding components such as a clutch rail, so interference does not occur when installing other devices on the offshore platform 100.

[0031] The above-mentioned lower unit yoke module 310a and upper unit yoke module 310b may include, as shown in Figures 2 and 3, a yoke frame 313 that is arc-shaped when viewed in a plane and has a first actuator 311 and a jacking pin 312 at its center, and a plate-shaped side connecting flange 314 that protrudes at least outward from both ends of the yoke frame 313 and is integral with the yoke frame 313 to cover 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 has a circular pipe shape, by 120°. A first actuator 311 may be provided on the outside of the center, and a jacking pin 312 may be provided on the inside of the center so as to protrude inward by the first actuator 311. For example, the lower unit yoke module 310a may be formed integrally with the yoke frame 313 such that the side connecting flange 314 protrudes at least outward and downward from one end (other end) of the yoke frame 313 and covers one end (other end) of the yoke frame 313. For example, the upper unit yoke module 310b may be formed integrally with the yoke frame 313 such that the side connecting flange 314 protrudes at least outward and upward from one end (other end) of the yoke frame 313 and covers one end (other end) of the yoke frame 313.

[0033] In this case, one side connecting flange 314 that is integral with one end (other end) of one yoke frame 313 and another side connecting flange 314 that abuts against one side connecting flange 314 of another yoke frame 313 arranged adjacent to one yoke frame 313 can be connected to each other by bolting at least the portion that protrudes outward from the yoke frame 313 while abutting against each other.

[0034] JPEG0007742083000003.jpg89150

[0035] JPEG0007742083000004.jpg115150

[0036] In addition, the second fixing flange 315 is formed to be spaced apart from the upper surface of the offshore platform 100 when coupled with the first fixing flange 110, thereby minimizing the effect of vibrations transmitted through the offshore platform 100 due to work on the offshore platform 100 on the legs 200. In addition, the first fixing flange 110 and the second fixing flange 315 may be provided with support reinforcing pieces that are arranged spaced apart in the length direction on surfaces that do not face each other and are connected to the upper surface of the offshore platform 100 and the bottom surface of the lower unit yoke module 310a.

[0037] Meanwhile, the jack-up cylinder 320 is configured to connect the above-mentioned lower unit yoke module 310a and upper unit yoke module 310b while allowing the length to be adjusted in the vertical direction. The connection between one lower unit yoke module 310a and one upper unit yoke module 310b can be made through one jack-up cylinder 320, but it is preferable to use 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] For example, the jack-up cylinder 320 may include a cylinder tube 321 having a lower end connected to the lower unit yoke module 310a, and a cylinder rod 322 that moves up and down while being partially housed inside the cylinder tube 321 and has an upper end connected to the upper unit yoke module 310b, and may be configured as a hydraulic cylinder in which the cylinder rod 322 moves up and down through hydraulic pressure. The jack-up cylinder 320 may be axially coupled at its upper and lower ends so that it can stably move up and down even when lateral vibrations occur due to movement of the legs 200 or work on the offshore platform 100, and the connection between the lower unit yoke module 310a and the upper unit yoke module 310b can be firmly maintained. Specifically, the lower end of the cylinder tube 321 is axially connected to a fixed shaft 316 that crosses the inside and outside of the yoke frame 313 that constitutes the lower unit yoke module 310a, and the upper end of the cylinder rod 322 is axially connected to a fixed shaft 316 that crosses the inside and outside of the yoke frame 313 that constitutes the upper unit yoke module 310b.

[0039] If the jack-up cylinder 320 is a hydraulic cylinder, the present invention may further include a hydraulic control unit that controls hydraulic pressure supplied to the jack-up cylinder 320. The hydraulic control unit may control hydraulic pressure to drive the jack-up cylinder 320 in a forward direction (a direction in which the length increases) or in a reverse direction (a direction in which the length decreases). The hydraulic control unit may also include a vibration induction switching module that switches hydraulic pressure control for driving the jack-up cylinder 320 in the forward and reverse directions at a fast cycle. This allows the jack-up cylinder 320 to operate in a vertical direction, and this function may be used when driving the lower end of the leg 200 into the seabed.

[0040] Meanwhile, in consideration of the fact that the jacking apparatus 300 will not be used for a long period of time after construction of the offshore platform 100 is completed, the jacking apparatus 300 can be separated from the offshore platform 100 and the legs 200 to increase the utility of the jacking apparatus 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 legs 200 can be maintained even when the jacking apparatus 300 is not present.

[0041] 8 and 9, the leg fixing device 400 is a device for fixing the leg 200 to the offshore platform 100, and is installed inside the offshore platform 100, unlike the jacking device 300 which is installed outside the offshore platform 100. As a result, the leg 200 can be firmly fixed even after the portable jacking device 300 is removed, and it can prevent exposure to moisture and salt and the effects of external factors such as waves and wind, so the leg fixing device 400 can be operated without continuous maintenance and repair.

[0042] As shown in FIG. 9, such a leg fixing device 400 may include, as 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 driving space 130 so as to be in contact with the leg support portion 120, and has a through hole 411 formed in the front-rear direction corresponding to the position of the pinhole 210.

[0044] 9 to 12, the cylinder block 410 may have a rectangular parallelepiped shape and may have two through holes 411 formed on the top and bottom. The through holes 411 are configured so that the pin blocks 430 can be inserted into them to slide forward and backward, and the legs 200 can be supported through the two pin blocks 430. After supporting the legs 200, the pin blocks 430 are essentially subjected to a force due to the load of the offshore platform 100. Therefore, it is preferable to provide a sufficient number of through holes 411 and pin blocks 430 to withstand this force, 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 and has pin holes 210 formed in three vertical rows at 120° intervals based on a horizontal cross section, and correspondingly, the leg fixing devices 400 including the cylinder blocks 410 may be arranged to face the leg 200 in three directions corresponding to the positions of the pin holes 210. With this structure, two pin blocks 430 are inserted into each cylinder block 410, so that each leg 200 is supported by a total of six pin blocks 430 in three directions, and a total of three leg fixing devices 400 make up one set, and the three sets in total may firmly fix and support the offshore platform 100 while distributing its load.

[0046] JPEG0007742083000005.jpg77150

[0047] As shown in FIGS. 9 and 13, the pin block 430 moves back and forth while inserted into the through-hole 411, its front end is inserted into the pin hole 210, and its rear end is formed with a fastening portion 431 that is coupled to the second actuator 440. The second actuator 440 is configured to move the pin block 430 back and forth by connecting one end to the fastening portion 431 and the other end being fixed to the driving space 130. The second actuator 440 is a cylinder whose length changes when driven, and in particular, may be configured as a hydraulic cylinder to smoothly move the relatively heavy pin block 430 back and forth. It is preferable that the second actuator 440 be controlled so that the leg 200 can be firmly fixed by cooperation with the jacking device (or means) 300 while the leg 200 is raised or lowered. In this way, the second actuator 440 needs to be hingedly coupled to the pin block 430 and the driving space 130 as its length changes, and therefore the fastening portion 431 may be configured in a pad eye shape.

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

[0049] 12, two inner frames 414 are formed in the cylinder block 410 in the vertical direction, and each inner frame 414 is connected to an outer frame 413 via horizontal supports 416 on its side. In addition, the upper side of the upper inner frame 414, the lower side of the lower inner frame 414, and the inner frames 414 themselves are interconnected via vertical supports 415, thereby supporting the load and preventing deformation.

[0050] 13, in accordance with the shape of the inner frame 414, the pin block 430 is integrally formed with a rear block 432 on the rear side having an outer diameter corresponding to the first diameter and a front block 433 on the front side having an outer diameter corresponding to the second diameter. The rear block 432 is formed with a horizontal surface 432a extending horizontally on the top and bottom sides, and the front block 433 is formed with a vertical surface 433a extending vertically on the left and right sides. This allows for more effective support of load and prevention of deformation than a completely circular block. Furthermore, lubricant 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 sticking even when the fixed state is maintained for a long period of time.

[0051] Meanwhile, the offshore platform 100 and the leg 200 are structures with considerable loads and sizes, and are therefore susceptible to deformation due to their own weight, various offshore environments, etc. In particular, when the leg 200 is supported by the cylinder block 410 and the pin block 430, even a very small deformation or twist of the offshore platform 100 and the leg 200 can cause the pin block 430 to move unsmoothly. In this case, an external impact applied to move the pin block 430 can cause damage or deformation to the pin block 430 and the cylinder block 410, worsening the situation.

[0052] JPEG0007742083000006.jpg35169

[0053] 14(a), a third actuator 450 may be provided inside the driving space 130, contacting the horizontal bottom surface 412a and adjusting its length to raise or lower the cylinder block 410. The third actuator 450 is a hydraulic cylinder capable of supporting a large load, and since the horizontal bottom surfaces 412a are installed on both the upper and lower sides of the side support portion 412, the third actuator 450 may be selectively installed between the lower horizontal bottom surface 412a and the bottom surface of the driving space 130 or between the upper horizontal bottom surface 412a and the ceiling surface of the driving space 130. In addition, the cylinder block 410 applies a force pushing the bottom surface of the drive space 130 downward due to its load, but when the pin block 430 is inserted into the pin hole 210, the load of the offshore platform 100 applies a force pushing the cylinder block 410 upward against the ceiling surface of the drive space 130, so it is preferable to install third actuators 450 on all the upper and lower sides of the side support portion 412.

[0054] Additionally, 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 Fig. 14(b), the upper frame 422 and the lower frame 423 may be provided with insertion portions 425 into which the spacers 424 can be inserted and then removed. The spacers 424 inserted into the upper frame 422 receive a load between the cylinder block 410 and the ceiling surface of the driving space 130, and the spacers 424 inserted into the lower frame 423 receive a load between the cylinder block 410 and the bottom surface of the driving space 130.

[0055] The spacers 424 may be made of a metal plate having a predetermined thickness and capable of withstanding a heavy load. Furthermore, depending on the number of spacers 424 inserted, the cylinder block 410 can be moved upward or downward, thereby effectively addressing the above-mentioned problem situations. [Explanation of symbols]

[0056] 100 Offshore Platforms 110 First fixed flange 120 Leg Support 130 Drive Space 200 legs 210 Pinhole 300 Jacking Device 310a Lower Unit Yoke Module 310b Upper unit yoke module 311 First Actuator 312 Jacking Pin 313 Yoke Frame 314 Side Joint Flange 315 Second fixed flange 316 Fixed axis 320 Jack-up cylinder 321 Cylinder tube 322 Cylinder rod 400 Leg Fixation Device 410 cylinder block 411 Through hole 412 Side support part 412a horizontal bottom 412b Reinforcement plate 413 Outer Frame 414 Inner 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 section 430 pin block 431 Fastening part 432 Rear block 432a Horizontal part 433 Front Block 433a Vertical surface section 440 Second Actuator 450 3rd Actuator

Claims

1. an offshore platform (100) capable of floating on water; A plurality of legs (200) that vertically penetrate the offshore platform (100); and a jacking device (300) that is installed on the offshore platform (100) and that can move the legs (200) up and down relative to the offshore platform (100) and then fix them, or move the offshore platform (100) up and down 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) a lower unit yoke module (310a) that is installed on the offshore platform (100), can be coupled to or decoupled from the leg (200), and a plurality of lower unit yoke modules can be coupled to each other to surround the outside of the leg (200) adjacent to the offshore platform (100); an upper unit yoke module (310b) that is spaced apart from the lower unit yoke module (310a) by a predetermined distance and can be coupled to or uncoupled from the leg (200), and a plurality of upper unit yoke modules are coupled to each other to surround the outside of the leg (200); a jack-up cylinder (320) that connects the lower unit yoke module (310a) and the upper unit yoke module (310b) and is capable of adjusting its length in the vertical direction, Each of the lower unit yoke module 310a and the upper unit yoke module 310b is provided with a jacking pin 312 that is moved inward by a first actuator 311 to be inserted into the pin hole 210 or moved outward by a first actuator 311 to be removed from the pin hole 210. Each of the lower unit yoke module (310a) and the upper unit yoke module (310b) comprises: The yoke frame (313) has an arc shape when viewed from above, and has a first actuator (311) and a jacking pin (312) at its center. Side coupling flanges (314) are plate-shaped and integral with the yoke frame (313) to cover both ends of the yoke frame (313) while protruding at least outward from both ends of the yoke frame (313). A separate type offshore plant jacking system, characterized in that one side connecting flange (314) integral with one end of one yoke frame (313) and another side connecting flange (314) abutting against the one side connecting flange (314) of another yoke frame (313) arranged adjacent to the one yoke frame (313) are formed with a protrusion and groove structure that engages with each other in the vertical direction on mutually facing surfaces.

2.

3. The jack-up cylinder (320) is configured as a hydraulic cylinder including a cylinder tube (321) whose lower end is axially connected to the lower unit yoke module (310a), and a cylinder rod (322) that moves up and down while being partially housed inside the cylinder tube (321) and whose upper end is axially connected to the upper unit yoke module (310b), a hydraulic control unit for controlling hydraulic pressure supplied to the jack-up cylinder (320); 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) from inside to outside.

2. The separate type offshore plant jacking system according to claim 1, wherein the hydraulic control unit can control hydraulic pressure so that the jack-up cylinder (320) can move up and down.

4. The offshore platform (100) includes a plurality of leg support parts (120) that penetrate the frame side in the vertical direction at set intervals and into which legs (200) are inserted, and a driving space (130) in the form of a compartment adjacent to the leg support parts (120), The leg fixing device (400) is provided in the driving space (130) and fixes the leg (200); The leg fixing device (400) comprises: a cylinder block (410) that is installed in the driving space (130) so as to be in contact with the leg support part (120) and has a through hole (411) formed in the front-rear direction corresponding to the position of the pinhole (210); a support structure (420) that covers the cylinder block (410) and supports it at the same height as the driving space (130); a pin block (430) that moves back and forth while inserted into the through hole (411), has its front end inserted into the pin hole (210), and has a fastening portion (431) formed at its rear end; 2. The separate offshore plant jacking system according to claim 1, further comprising: a second actuator (440) connected to the fastening portion (431) and adapted to move the pin block (430) forward and backward.

5. The cylinder block (410) has a rectangular parallelepiped shape, and side support parts (412) are formed on both sides of the cylinder block (410) horizontally extending outward and including a pair of horizontal bottom surfaces (412a) spaced apart from each other 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 and lower frames (422 and 423) that are respectively coupled to the upper and lower sides of the vertical frames (421); 5. The separate type offshore plant jacking system according to claim 4, further comprising: a pair of third actuators (450) provided to contact the bottom surface and the lower horizontal bottom surface (412 a) of the driving space (130) and raise and lower the cylinder block (410) by adjusting their lengths; and a pair of third actuators (450) provided to contact the ceiling surface and the upper horizontal bottom surface (412 a) of the driving space (130) and raise and lower the cylinder block (410) by adjusting their lengths.

6. The cylinder block (410) is provided with an outer frame (413) having a rectangular parallelepiped shape, an inner frame (414) penetrating in the front-rear direction and forming a through hole (411) consisting of a rear cylinder portion (414a) having a first diameter in a rear section and a front cylinder portion (414b) having a second diameter smaller than the first diameter in a front section, a vertical support (415) supporting the inner frame (414) vertically, and a horizontal support (416) supporting the inner frame (414) horizontally. The pin block (430) is composed of 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, The rear block (432) has horizontal surface portions (432a) formed on the upper and lower sides, 5. The separate type offshore plant jacking system according to claim 4, wherein the front block (433) is formed with vertical surfaces (433a) perpendicular to the left and right sides.

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