Detachable jacking system for offshore plant
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- KOMS INC
- Filing Date
- 2024-12-20
- Publication Date
- 2026-06-04
Smart Images
Figure KR2024097191_04062026_PF_FP_ABST
Abstract
Description
Separable offshore plant jacking system
[0001] The present invention relates to a separable offshore plant jacking system, and more specifically, to a separable offshore plant jacking system that can maintain a state in which the jacking device and the leg are firmly coupled when constructing an offshore platform by a jacking method, and can minimize interference caused by the separated leg of the jacking device after the offshore platform is constructed.
[0002] Generally, offshore plants refer to all facilities installed in the ocean, including drilling and production facilities necessary for the development of marine resources, marine energy generation facilities such as offshore wind and tidal power plants, offshore factories, offshore airports, ship safety facilities, ocean observation facilities, and deep-sea resource development facilities. These offshore plants are classified into fixed, floating, and deep-sea facilities depending on their operational location.
[0003] Among them, fixed offshore plants are constructed by moving a floating offshore platform, in which multiple legs are joined via a jacking device, to the installation site, then using the jacking device to lower and secure the legs to the seabed, and finally lifting the offshore platform so that it is spaced a certain distance above the water surface.
[0004] In fixed offshore plants where the legs are supported on the seabed and the offshore platform is elevated above the water surface, jacking devices are not used because the plant operates for several years to decades. Accordingly, to increase the operational efficiency of the jacking device, the applicant of the present invention, Korean Registered Patent No. 10-2721767 (hereinafter referred to as the 'Cited Invention'), proposed a jacking device that can be separated from the legs after the construction of the offshore platform is completed.
[0005] In the cited invention, the leg coupled thereto for the construction of an offshore platform has a clutch rail formed in an uneven shape along the longitudinal direction of its outer surface, and is configured to be fixed by a clutch of a jacking device that crosses the groove of the clutch rail. Since the coupling between the jacking device and the leg is performed on the outer side of the leg, research on a more stable structure against external factors is continuously being conducted.
[0006] Furthermore, after the construction of the offshore platform is completed, the legs are secured to the platform using a leg fixing means (device) separate from the jacking device, and then the jacking device is detached from the platform. At this time, since the leg fixing means is exposed to moisture and salt for extended periods outside the offshore platform and is directly affected by external factors such as waves and wind, continuous maintenance is required.
[0007] The present invention was created in response to the aforementioned needs and aims to provide a separable offshore plant jacking system that eliminates the risk of the connection between the jacking device and the leg being weakened by external factors when constructing an offshore platform using a jacking method, allows the jacking module to be easily separated from the leg after the offshore platform is constructed, and prevents interference caused by the separated leg when installing other devices on the offshore platform.
[0008] In addition, the purpose is to provide a detachable offshore plant jacking system that can be operated without continuous maintenance of the leg fixing device, as a device for fixing the leg to the offshore platform for separating the jacking device is installed inside the offshore platform to prevent exposure to moisture and salt, as well as the influence of external factors such as waves and wind.
[0009] The offshore platform construction system of the present invention for achieving the above objective comprises: an offshore platform capable of floating on the water surface; and a plurality of legs penetrating the offshore platform in the vertical direction; and a jacking device installed on the offshore platform, capable of moving a leg up and down relative to the offshore platform and then fixing it, or moving the offshore platform up and down relative to a leg supported on the seabed and then fixing it; wherein the leg has a plurality of pinholes formed along its length, and the jacking device includes a lower unit yoke module installed on the offshore platform that can be coupled to or released from the leg and a plurality of which are interconnected to surround the outer side of the leg adjacent to the offshore platform, an upper unit yoke module located above at a predetermined distance from the lower unit yoke module that can be coupled to or released from the leg and a plurality of which are interconnected to surround the outer side of the leg, and a jacking cylinder that connects the lower unit yoke module and the upper unit yoke module and allows for length adjustment in the up and down direction, and wherein each of the lower unit yoke module and the upper unit yoke module is moved inward by a first actuator to the pinhole It is equipped with a jacking pin that is inserted or moved outward to disengage from the pinhole, and includes a sliding guide device constrained to the lower unit yoke module to prevent rotation of the upper unit yoke module.
[0010] Additionally, each of the lower unit yoke module and the upper unit yoke module comprises a yoke frame that forms an arc shape when viewed from a planar view and is equipped with a first actuator and a jacking pin in the central part, and a side coupling flange that forms a plate shape and is integral with the yoke frame to cover both ends of the yoke frame while protruding at least outwardly from both ends of the yoke frame, wherein a one side coupling flange that is integral with one end of the yoke frame and a other side coupling flange that contacts the one side coupling flange in an adjacent yoke frame may have a projection groove structure formed on the mutually facing surfaces that engage in an up-and-down direction.
[0011] In addition, the above-mentioned offshore platform is provided with a first fixing flange formed in a bar shape with a longitudinal cross-section facing outward toward the jacking device, which is provided on the lower side of the lower unit yoke module, and a second fixing flange formed in a bar shape with a longitudinal cross-section facing downward is provided on the bottom surface of the lower unit yoke module so as to protrude downward to engage with the first fixing flange upward, and the first fixing flange and the second fixing flange can be bolted together with each other while engaged upward.
[0012] Additionally, the jack-up cylinder comprises a hydraulic cylinder including a cylinder tube whose lower end is axially coupled to a lower unit yoke module and a cylinder rod whose upper end is axially coupled to an upper unit yoke module while moving in an up-and-down direction with a portion received inside the cylinder tube, and further comprises a hydraulic control unit for controlling 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 inwardly and outwardly, and the hydraulic control unit can control the hydraulic pressure so that the jack-up cylinder can operate in an up-and-down direction.
[0013] Additionally, the above-described marine platform further comprises a plurality of leg support members that penetrate vertically at intervals set along the edge and into which a leg is inserted, and a driving space in the form of a compartment in contact with the leg support members, and a leg fixing device provided within the driving space to fix the leg; wherein the leg fixing device comprises a cylinder block installed in the driving space to contact the leg support members and having a through hole formed in the front-rear direction corresponding to the position of the pin hole, a support structure that surrounds the cylinder block and supports it according to the height of the driving space, a pin block inserted into the through hole and moving back-and-forth, with a front end inserted into the pin hole and a fastening part formed at a rear end, and a second actuator connected to the fastening part to move the pin block back-and-forth.
[0014] Additionally, the cylinder block is formed in the shape of a rectangular prism, and a pair of horizontal bottom surfaces formed horizontally in the outward direction and spaced apart vertically, and a pair of reinforcing plates connecting the pair of horizontal bottom surfaces are formed protrudingly on both sides as a side support member, and the support structure includes a vertical frame that wraps around the side corners of the cylinder block, and an upper frame and a lower frame that are respectively coupled to the upper and lower sides of the vertical frame, and may further include a pair of third actuators that are provided to contact the bottom surface and the lower horizontal bottom surface of the driving space and raise and lower the cylinder block through length adjustment, and provided to contact the ceiling surface and the upper horizontal bottom surface of the driving space and raise and lower the cylinder block through length adjustment.
[0015] The above cylinder block is formed with an outer frame in the shape of a rectangular parallelepiped, an inner frame that penetrates in the front-rear direction and forms a through hole consisting of a rear cylinder section having a first diameter in the rear section and a front cylinder section having a second diameter smaller than the first diameter in the front section, a vertical support body that supports the inner frame vertically, and a horizontal support body that supports the inner frame horizontally, and the pin block is composed of a rear block having an outer diameter corresponding to the first diameter in the rear section and a front block having an outer diameter corresponding to the second diameter in the front section, wherein a horizontal surface section that is horizontal in the upper and lower sections is formed on the rear block, and a vertical surface section that is vertical in the left and right sections may be formed on the front block.
[0016] According to the present invention, when constructing an offshore platform using a jacking method, a jacking pin provided in a jacking device is inserted into a pin hole formed in a leg to form a connection between the jacking device and the leg. Consequently, there is no risk of the connection between the jacking device and the leg being weakened by external factors, the jacking device can be easily separated from the leg after the offshore platform is constructed, and no interference occurs due to the leg from which the jacking device has been separated when installing other devices on the offshore platform.
[0017] In addition, a leg fixing device is installed inside the offshore platform to secure the legs to the platform for the separation of the jacking device; this prevents exposure to moisture and salt, as well as the influence of external factors such as waves and wind, allowing for operation without the need for continuous maintenance of the leg fixing device.
[0018] FIG. 1 is a perspective view showing an example of a fixed offshore plant constructed using a jacking device applied to the present invention.
[0019] FIG. 2 is an assembled perspective view showing a jacking device applied to the present invention,
[0020] FIG. 3 is an exploded perspective view showing a jacking device applied to the present invention,
[0021] FIG. 4 is a perspective view showing the jacking device applied to the present invention fixed to a marine platform and coupled with a leg.
[0022] FIG. 5 is a cross-sectional view showing that the jacking device applied to the present invention is coupled through a leg and a jacking pin,
[0023] FIG. 6 is a perspective view showing the side coupling flanges of a jacking device applied to the present invention being coupled to each other.
[0024] FIG. 7 is a front view showing the second fixed flange of the jacking device applied to the present invention and the first fixed flange of the offshore platform being combined.
[0025] FIG. 8 is a perspective view showing an example of a fixed offshore plant constructed through a leg fixing device applied to the present invention.
[0026] FIG. 9 is a cross-sectional view showing the state in which a leg fixing device applied to the present invention is installed inside a marine platform.
[0027] FIG. 10 is a perspective view showing an example of a leg fixing device applied to the present invention,
[0028] FIG. 11 is a perspective view showing another example of a leg fixing device applied to the present invention,
[0029] FIG. 12 is a perspective view showing a cylinder block of a leg fixing device applied to the present invention,
[0030] FIG. 13 is a perspective view showing a pin block of a leg fixing device applied to the present invention,
[0031] FIG. 14 is an illustrative diagram showing that the height of the cylinder block of the leg fixing device applied to the present invention can be adjusted.
[0032] The present invention comprises: a floating 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, capable of moving the legs vertically relative to the offshore platform and fixing them, or moving the offshore platform vertically relative to a leg supported on the seabed and fixing it. In this case, the legs have a plurality of pinholes formed along their length. In addition, the jacking device comprises: a lower unit yoke module installed on the offshore platform that can be coupled to or uncoupled from a leg and can be interconnected in multiple units to surround the outer side of a leg adjacent to the offshore platform; an upper unit yoke module located above at a predetermined distance from the lower unit yoke module that can be coupled to or uncoupled from a leg and can be interconnected in multiple units to surround the outer side of a leg; and a jacking cylinder that connects the lower unit yoke module and the upper unit yoke module and allows for length adjustment in the vertical direction. Each of the lower unit yoke module and the upper unit yoke module is provided with a jacking pin that is moved inward by a first actuator to be inserted into a pinhole or moved outward to be removed from a pinhole. A separable offshore plant jacking system is proposed.
[0033] Hereinafter, the separable offshore plant jacking system of the present invention will be described in detail with reference to the attached FIGS. 1 to 14.
[0034] The separable offshore plant jacking system of the present invention basically includes an offshore platform (100), a leg (200), and a jacking device (300) as shown in FIG. 1.
[0035] The offshore platform (100) is a structure capable of floating on water and can be manufactured in various forms, such as a plate or a tube, and it is desirable to have a structure that considers mobility from land to sea, as well as safety and economic efficiency for offshore installation. For example, the offshore platform (100) may include a plurality of leg support members (120) that penetrate vertically at intervals set along the edges and into which a leg (200) is inserted, and a driving space (130) in the form of a compartment that contacts the leg support members (120).
[0036] As shown in FIG. 1, the leg (200) is configured to support the offshore platform (100) by penetrating it in the vertical direction, and the offshore platform (100) can be supported by a plurality of legs (200). For example, the leg (200) may be formed in the shape of a straight circular tube (pipe) and may be equipped with a spud can for installation on the seabed at the bottom. At this time, the leg (200) has a length such that its upper end is positioned above the surface of the offshore platform (100) which is located higher than the water level while the spud can is settled on the seabed bedrock layer. In this leg (200), a plurality of pinholes (210) are formed at regular intervals along the longitudinal direction, so that a jacking device (300) and / or a leg fixing device (400), which will be described later, can be coupled 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 thereto, and the number of rows formed by multiple pinholes (210) may vary depending on the size of the offshore platform (100), the shape of the leg (200), etc.
[0037] The jacking device (300) is configured to be installed on a marine platform (100) as shown in FIG. 1 and to connect the marine platform (100) and the leg (200), and is configured to allow the leg (200) to be moved up and down relative to the marine platform (100) and then fixed, or to allow the marine platform (100) to be moved up and down relative to the leg (200) supported on the seabed and then fixed.
[0038] In particular, the jacking device (300) in the present invention is configured to be coupled to or uncoupled 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 jacking cylinder (320) as shown in FIGS. 2 to 4.
[0039] The lower unit yoke module (310a) is coupled to the upper surface of the offshore platform (100) and is configured to be coupled to or uncoupled from the leg (200) located on the inner side. A plurality of these lower unit yoke modules (310a) are arranged such that their ends are coupled to each other to surround the outer side of the leg (200) adjacent to the upper surface of the offshore platform (100) in the leg (200) that penetrates the offshore platform (100). In the present invention, the lower unit yoke module (310a) is provided with a jacking pin (312) that can be coupled with the pin hole (210) of the leg (200) as shown in FIGS. 2 to 5. The jacking pin (312) can be moved inward by a first actuator (311) provided on the outer side of the lower unit yoke module (310a) and inserted into the pin hole (210), thereby coupling the leg (200) and the lower unit yoke module (310a). Additionally, while inserted into the pin hole (210), it can be moved outward by the first actuator (311) and detached from the pin hole (210), thereby releasing the coupling between the leg (200) and the lower unit yoke module (310a).
[0040] The upper unit yoke module (310b) is provided on the upper side at a predetermined distance from the lower unit yoke module (310a) and is configured to be coupled with or uncoupled from the leg (200) located on the inner side. Similar to the lower unit yoke module (310a), a plurality of these upper unit yoke modules (310b) are interconnected to surround the outer side of the leg (200). In addition, the upper unit yoke module (310b) in the present invention is provided with a jacking pin (312) that can be coupled with the pin hole (210) of the leg (200) as shown in FIGS. 2 to 5. The jacking pin (312) can be moved inward by a first actuator (311) provided on the outer side of the upper unit yoke module (310b) and inserted into the pin hole (210) to combine the leg (200) and the upper unit yoke module (310b). When inserted into the pin hole (210), the jacking pin (312) can be moved outward by the first actuator (311) and detached from the pin hole (210), thereby releasing the combination between the leg (200) and the upper unit yoke module (310b).
[0041] As such, the jacking device (300) is coupled to the leg (200) by inserting the jacking pin (312) provided in the lower unit yoke module (310a) and the jacking pin (312) provided in the upper unit yoke module (310b) through the pin hole (210) formed in the leg (200), so there is no concern that the coupling between the jacking device (300) and the leg (200) will be weakened by external factors when constructing the offshore platform (100) by the jacking method. In addition, 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) that are connected at their ends, as shown in FIG. 3. In addition, the leg (200) separated from the jacking device (300) does not include a configuration protruding outward, such as a clutch rail, so there is no interference when installing other devices on the marine platform (100).
[0042] The lower unit yoke module (310a) and the upper unit yoke module (310b) described above may each include a yoke frame (313) that forms an arc shape when viewed from a planar view as shown in FIG. 2 and FIG. 3 and is equipped with a first actuator (311) and a jacking pin (312) in the central part, and a side coupling flange (314) that forms a plate shape and is integral with the yoke frame (313) to cover both ends of the yoke frame (313) while protruding at least outwardly from both ends of the yoke frame (313).
[0043] For example, the yoke frame (313) may be formed to surround the leg (200), which is in the shape of a circular tube (pipe), by 120° to the outside, and a first actuator (311) may be provided on the outer side of the central part, and a jacking pin (312) may be provided on the inner side of the central part so as to protrude inward by the first actuator (311). For example, the lower unit yoke module (310a) may be provided such that the side coupling flange (314) protrudes at least outwardly and downwardly from one end (other end) of the yoke frame (313) and covers one end (other end) of the yoke frame (313), forming an integral part with the yoke frame (313). Additionally, the upper unit yoke module (310b) may be provided such that the side coupling flange (314) protrudes at least outwardly and upwardly from one end (other end) of the yoke frame (313) and covers one end (other end) of the yoke frame (313), thereby forming an integral part with the yoke frame (313).
[0044] At this time, a one-sided connecting flange (314) that is integral with one end (or other end) of a yoke frame (313) and a other-sided connecting flange (314) that is in contact with the one-sided connecting flange (314) in a yoke frame (313) that is adjacent to the yoke frame (313) can be joined together by making a bolt connection in a portion that protrudes at least outwardly from the yoke frame (313) while in contact with each other.
[0045] In addition, when a vertical force is applied to the jacking device (300) due to vertical movement of the leg (200), the connection between the multiple lower unit yoke modules (310a) and the connection between the multiple upper unit yoke modules (310b) can withstand the vertical force and maintain a stable connected state, so that the one-sided connecting flange (314) and the other-sided connecting flange (314) may have a projection groove structure formed on mutually facing surfaces that engages in the vertical direction. For example, as illustrated in FIG. 6, the one-sided connecting flange (314) is formed such that its longitudinal section is in the shape of 'U' and the other-sided connecting flange (314) is formed such that its longitudinal section is in the shape of 'U', and a fixing protrusion protruding from the center of the one-sided connecting flange (314) toward the other-sided connecting flange (314) is inserted into a fixing groove formed in the center of the other-sided connecting flange (314) to form a primary connection. Furthermore, even if an upward and downward force is applied while the one-sided connecting flange (314) and the other-sided connecting flange (314) are not bolted to each other, the one-sided connecting flange (314) and the other-sided connecting flange (314) are not separated.
[0046] Meanwhile, as described above, the lower unit yoke module (310a) is coupled to the upper surface of the offshore platform (100), and the coupling between the lower unit yoke module (310a) and the offshore platform (100) can be configured to withstand vertical forces. For example, as shown in FIG. 7, the offshore platform (100) may have a first fixing flange (110) protruding from the upper surface on the lower side of the portion where the yoke frame (313) of the lower unit yoke module (310a) is located, and the lower unit yoke module (310a) may have a second fixing flange (315) protruding downward on the lower surface that engages with the first fixing flange (110). The first fixed flange (110) and the second fixed flange (315) are each formed in the shape of a straight bar and can be provided on the offshore platform (100) and the lower unit yoke module (310a) in a horizontal position. At this time, the first fixed flange (110) has a cross-sectional shape that is inverted 'L' facing outward toward the jacking device (300), and the second fixed flange (315) has a cross-sectional shape that is inverted 'L', so that the first fixed flange (110) and the second fixed flange (315) are engaged upwardly with respect to the lower unit yoke module (310a) relative to the offshore platform (100). And the first fixed flange (110) and the second fixed flange (315) are bolted together in an upwardly engaged state, thereby preventing downward movement of the lower unit yoke module (310a) relative to the offshore platform (100).
[0047] In addition, the second fixed flange (315) is formed to be spaced apart from the upper surface of the offshore platform (100) when combined with the first fixed flange (110), thereby minimizing the effect of vibrations transmitted through the offshore platform (100) on the leg (200) due to work on the offshore platform (100). Furthermore, the first fixed flange (110) and the second fixed flange (315) may each be provided with a support reinforcement piece that is spaced apart in the longitudinal direction on non-facing surfaces and connected to the upper surface of the offshore platform (100) and the lower surface of the lower unit yoke module (310a).
[0048] Meanwhile, the jack-up cylinder (320) is configured to adjust its length in the vertical direction while connecting the lower unit yoke module (310a) and the upper unit yoke module (310b) described above. Additionally, although the connection between a single lower unit yoke module (310a) and an upper unit yoke module (310b) can be achieved through a single jack-up cylinder (320), 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 be stably moved by the operation of the jack-up cylinder (320).
[0049] The jack-up cylinder (320) may include, for example, a cylinder tube (321) whose lower end is connected to a lower unit yoke module (310a), and a cylinder rod (322) whose upper end is connected to an upper unit yoke module (310b) and which moves up and down while being partially accommodated inside the cylinder tube (321), and may be configured as a hydraulic cylinder in which the cylinder rod (322) moves up and down through hydraulic pressure. Furthermore, it is preferable that the upper end and lower end of the jack-up cylinder (320) be axially connected so that the upper end can be stably moved up and down even if lateral vibrations due to the movement of the leg (200) or lateral vibrations due to work on the offshore platform (100) occur, and so that 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 by a fixed shaft (316) that crosses inwardly and outwardly through the yoke frame (313) constituting the lower unit yoke module (310a), and the upper end of the cylinder rod (322) can be axially connected by a fixed shaft (316) that crosses inwardly and outwardly through the yoke frame (313) constituting the upper unit yoke module (310b).
[0050] In addition, the present invention may further include a hydraulic control unit that controls the hydraulic pressure supplied to the jack-up cylinder (320) when the jack-up cylinder (320) is a hydraulic cylinder. The hydraulic control unit may control the hydraulic pressure to drive the jack-up cylinder (320) in a forward direction (in the direction of lengthening) or to drive the jack-up cylinder (320) in a reverse direction (in the direction of lengthening). Furthermore, the hydraulic control unit may include a vibration induction switching module, and the vibration induction switching module causes the hydraulic pressure control for driving the jack-up cylinder (320) in the forward and reverse directions to switch at a rapid cycle. Accordingly, the jack-up cylinder (320) can be operated in an up-and-down direction, and this function can be used when driving the lower end of the leg (200) into the seabed.
[0051] Meanwhile, 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 of the jacking device (300). At this time, the present invention may further include a leg fixing device (400) so that a solid connection between the offshore platform (100) and the leg (200) can be maintained even without the jacking device (300).
[0052] The leg fixing device (400) is a device for fixing the leg (200) to the offshore platform (100) as shown in FIGS. 8 and 9, and is installed inside the offshore platform (100), unlike the jacking device (300) which is installed outside the offshore platform (100). Accordingly, the leg (200) can be firmly fixed even after the removal of the portable jacking device (300), and the leg can be prevented from being exposed to moisture and salt and from being affected by external factors such as waves and wind, so that it can be operated without continuous maintenance of the leg fixing device (400).
[0053] As shown in FIG. 9, this leg fixing device (400) may include a cylinder block (410), a support structure (420), a pin block (430), and a second actuator (440) as main components.
[0054] The cylinder block (410) is installed in the configuration space (130) so as to be in contact with the leg support (120), and a through hole (411) in the front and rear direction is formed corresponding to the position of the pinhole (210).
[0055] For example, the cylinder block (410) is formed in the shape of a rectangular prism as shown in FIGS. 9 to 12, and two through holes (411) may be formed on the upper and lower sides. The through holes (411) are configured to allow the pin block (430) to slide in the front and rear directions, and the leg (200) can be supported through the two pin blocks (430). Since the pin block (430) is subjected to a force due to the load of the offshore platform (100) after supporting the leg (200), it is preferable to have a sufficient number of through holes (411) and pin blocks (430) to withstand this force. 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 leg (200).
[0056] As a specific example, the leg (200) is in the shape of a cylinder and has pin holes (210) formed in three rows in the vertical direction at intervals of 120° relative to the horizontal cross-section, and the leg fixing device (400) including the cylinder block (410) corresponding to this can be positioned to face the leg (200) from three directions corresponding to the position of the pin holes (210). Through this structure, two pin blocks (430) are inserted per cylinder block (410), so each leg (200) is supported by a total of six pin blocks (430) from three directions, and all three leg fixing devices (400) form a set, and a total of three sets can be firmly fixed and supported while distributing the load of the offshore platform (100).
[0057] The support structure (420) surrounds the cylinder block (410) and serves to support it at the height of the driving space (130). The support structure (420) may, for example, include a vertical frame (421) that surrounds the side corners of the cylinder block (410), which is in the shape of a rectangular parallelepiped as shown in FIGS. 10 and 11, and an upper frame (422) and a lower frame (423) that are respectively connected to the upper and lower sides of the vertical frame (421). The vertical frame (421) may be configured such that four angle structures, each having a cross-section in the shape of an 'L', surround and support the side corners of the cylinder block (410) and allow the cylinder block (410) to move in the vertical direction. And the upper frame (422) and lower frame (423) are respectively connected to the upper and lower parts of the vertical frame (421) and are fixed in close contact with the floor and ceiling of the driving space (130), and can be configured to support the load of the cylinder block (410) from the upper and lower parts, respectively.
[0058] As shown in FIGS. 9 and 13, the pin block (430) is inserted into a through hole (411) and moves back and forth, with the front end inserted into a pin hole (210) and a connecting part (431) formed at the rear end that is coupled with a second actuator (440). The second actuator (440) is configured such that one end is connected to the connecting part (431) and the other end is fixed to the driving space (130) to move the pin block (430) back and forth. It is configured as a cylinder whose length changes according to driving. In particular, it may be configured as a hydraulic cylinder to smoothly move the pin block (430) with a relatively large weight back and forth, and it is preferable that it be controlled so that the leg (200) can be firmly fixed by operating in conjunction with the jacking device (300) during the raising and lowering of the leg (200). As the length of the second actuator (440) changes, it is necessary to hinge-connect it within the pin block (430) and the driving space (130), and accordingly, the connecting part (431) can be configured in the shape of a pad eye.
[0059] As a specific example, the cylinder block (410) receives a significant load together with the pin block (430) as shown in FIG. 12, so that it can properly distribute this load and maintain its shape, the outer frame (413) which is in the shape of a rectangular prism is formed, the inner frame (414) which forms a through hole (411) formed by a rear cylinder section (414a) which penetrates in the front and rear directions and has a first diameter in the rear section and a stacked cylinder section (414b) which has a second diameter smaller than the first diameter in the front section, the vertical support (415) which supports the inner frame (414) vertically, and the horizontal support (416) which supports the inner frame (414) horizontally are formed.
[0060] As shown in FIG. 12, two inner frames (414) are formed in the vertical direction of the cylinder block (410), and each inner frame (414) is connected to an outer frame (413) via a horizontal support member (416) on the 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) are each interconnected via a vertical support member (415) to support the load and prevent deformation.
[0061] Corresponding to the shape of the inner frame (414), the pin block (430) is integrally formed with 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, as shown in FIG. 13. Additionally, a horizontal surface portion (432a) that is horizontal in the upper and lower directions is partially formed on the rear block (432), and a vertical surface portion (433a) that is vertical in the left and right directions is partially formed on the front block (433), so that load-bearing capacity and prevention of shape deformation compared to a perfect circle can be effectively achieved. Furthermore, lubricating oil is injected and maintained through the space between the horizontal surface portion (432a) and the vertical surface portion (433a) and the inner wall of the front cylinder portion (414b) and the rear cylinder portion (414a), thereby preventing sticking even when maintaining a fixed state for a long time.
[0062] Meanwhile, the offshore platform (100) and the leg (200) are structures with significant load and size, and there is a high risk that shape deformation may occur due to their own weight and various marine environments. In particular, when the leg (200) is supported by the cylinder block (410) and the pin block (430), even very small shape deformation or twisting of the offshore platform (100) and the leg (200) may cause the movement of the pin block (430) to be hindered. In this case, an external impact applied to move the pin block (430) may cause damage or deformation to the pin block (430) and the cylinder block (410), thereby worsening the situation.
[0063] Accordingly, the leg fixing device (400) of the present invention adjusts the height of the cylinder block (410) and facilitates the smooth movement of the pin block (430). To this end, as shown in FIGS. 11 and 12, a side support member (412) may be formed protrudingly on both sides, comprising a pair of horizontal bottom surfaces (412a) formed horizontally in the outward direction and arranged spaced apart vertically, and a plurality of reinforcing plates (412b) connecting the pair of horizontal bottom surfaces (412a). As an example, ' The side support member (412) can be configured such that three reinforcing plates (412b) of the shape are welded at equal intervals, and then horizontal bottom surfaces (412a) are attached to the upper and lower sides, respectively.
[0064] And, as shown in FIG. 14a, a third actuator (450) may be provided inside the driving space (130) to raise and lower the cylinder block (410) by adjusting its length while in contact with the horizontal floor surface (412a). The third actuator (450) is a hydraulic cylinder capable of supporting a large load, and as the horizontal floor surface (412a) is installed equally on the upper and lower sides of the side support member (412), the third actuator (450) may be selectively installed between the lower horizontal floor surface (412a) and the floor surface of the driving space (130) or between the upper horizontal floor surface (412a) and the ceiling surface of the driving space (130). In addition, the cylinder block (410) applies a force that presses the bottom surface of the driving space (130) downward due to its load, but when the pin block (430) is inserted into the pin hole (210), the cylinder block (410) applies a force that presses the ceiling surface of the driving space (130) upward due to the load of the marine platform (100), so it is preferable to install a third actuator (450) on both the upper and lower sides of the side support member (412).
[0065] Along with this, a spacer (424) that supports the cylinder block (410) and is inserted into the upper frame (422) and lower frame (423) may be provided. As shown in FIG. 14b, the upper frame (422) and lower frame (423) may be provided with an insertion part (425) that can insert and remove the spacer (424). The spacer (424) inserted into the upper frame (422) receives a load between the cylinder block (410) and the ceiling surface of the driving space (130), and the spacer (424) inserted into the lower frame (423) receives a load between the cylinder block (410) and the floor surface of the driving space (130).
[0066] The spacer (424) may be a metal plate with a set thickness capable of withstanding a heavy load, and as the number of inserted spacers (424) increases or decreases, the cylinder block (410) moves up and down, and can effectively respond to the aforementioned problem situation.
Claims
1. A floating offshore platform; A plurality of legs penetrating the above-mentioned offshore platform in the vertical direction; and A jacking device installed on the above-mentioned offshore platform, capable of moving a leg up and down relative to the offshore platform and then fixing it, or moving the offshore platform up and down relative to a leg supported on the seabed and then fixing it; The above leg has a plurality of pinholes formed along the longitudinal direction, and The above jacking device is, A lower unit yoke module installed on the above-mentioned offshore platform, which can be coupled to or uncoupled from a leg, and multiple modules that can be interconnected to surround the outer side of a leg adjacent to the offshore platform, and An upper unit yoke module that can be coupled to or released from a leg at an upper side spaced apart from the lower unit yoke module at a predetermined distance, and a plurality of such modules can be interconnected to surround the outer side of the leg; It includes a jacking cylinder that can adjust the length in the vertical direction while connecting the lower unit yoke module and the upper unit yoke module, A separable offshore plant jacking system characterized in that each of the lower unit yoke module and the upper unit yoke module is provided with a jacking pin that is moved inward by a first actuator to be inserted into a pinhole or moved outward to be removed from a pinhole.
2. In Paragraph 1, Each of the above lower unit yoke module and upper unit yoke module is, It includes a yoke frame that forms an arc shape when viewed in a planar view and is equipped with a first actuator and a jacking pin in the central part, and a side coupling flange that forms a plate shape and is integral with the yoke frame, protruding at least outwardly from both ends of the yoke frame and covering both ends of the yoke frame. A separable offshore plant jacking system characterized by a one-sided connecting flange that is integral with one end of a yoke frame, and a other-sided connecting flange that contacts the one-sided connecting flange in another yoke frame adjacent to the one-sided yoke frame (313), having a projection groove structure formed on the mutually facing surfaces that engage in an up-and-down direction.
3. In Paragraph 2, The above-mentioned offshore platform has a first fixed flange formed in a bar shape with a longitudinal cross-section facing the outside of the jacking device, forming an 'L' shape, provided on the lower side of the lower unit yoke module, and On the bottom surface of the lower unit yoke module, a second fixing flange is provided to protrude downward, with a cross-section formed in the shape of an 'L' so as to be engaged upward with the first fixing flange. A separable offshore plant jacking system characterized in that the first fixed flange and the second fixed flange are bolted together in a state where they are caught upward.
4. In Paragraph 2, The above jack-up cylinder is composed of a hydraulic cylinder including a cylinder tube whose lower end is axially coupled to a lower unit yoke module, and a cylinder rod whose upper end is axially coupled to an upper unit yoke module while moving in an up-and-down direction with a portion received inside the cylinder tube. A hydraulic control unit for controlling the hydraulic pressure supplied to the jack-up cylinder; further comprising, 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 inwardly and outwardly, and The above hydraulic control unit is characterized by being able to control hydraulic pressure so that the jack-up cylinder can operate in the up-and-down direction, in a separable offshore plant jacking system.
5. In Paragraph 1, The above-described offshore platform includes a plurality of leg support members that penetrate vertically at intervals set along the perimeter and into which legs are inserted, and a driving space in the form of a compartment in contact with the leg support members. A leg fixing device provided within the above-mentioned driving space for fixing the leg; further comprising, The above leg fixing device is, A cylinder block installed in a driving space to contact the above-mentioned leg support, with through holes formed in the front and rear directions corresponding to the position of the pinhole, and A support structure that surrounds the above cylinder block and supports it according to the height of the driving space, and A pin block that is inserted into the above-mentioned through hole and moves back and forth, with the front end inserted into the pin hole and the rear end having a fastening portion formed therein, and A separable offshore plant jacking system characterized by including a second actuator connected to the above-mentioned connecting part to move the pin block back and forth.
6. In Paragraph 5, The above cylinder block is formed in the shape of a rectangular parallelepiped, and includes a pair of horizontal bottom surfaces formed horizontally in the outward direction and spaced apart vertically, and a plurality of reinforcing plates connecting the pair of horizontal bottom surfaces, with side support members protruding from both sides. The above support structure includes a vertical frame that wraps around the side corners of the cylinder block, an upper frame and a lower frame that are respectively connected to the upper and lower sides of the vertical frame. A separable offshore plant jacking system characterized by further including a pair of third actuators, which are provided to contact the bottom surface and lower horizontal floor surface of the above-mentioned driving space and raise and lower the cylinder block through length adjustment, and provided to contact the ceiling surface and upper horizontal floor surface of the above-mentioned driving space and raise and lower the cylinder block through length adjustment.
7. In Paragraph 5, The above cylinder block is formed with an outer frame in the shape of a rectangular parallelepiped, an inner frame that penetrates in the front-rear direction and forms a through hole consisting of a rear cylinder section having a first diameter in the rear section and a front cylinder section having a second diameter smaller than the first diameter in the front section, a vertical support body that supports the inner frame vertically, and a horizontal support body that supports the inner frame horizontally. The above pin block is composed of a rear block having an outer diameter corresponding to a first diameter on the rear side and a front block having an outer diameter corresponding to a second diameter on the front side. A horizontal surface portion is formed in the above rear block to form a horizontal plane in the upper and lower directions, and A separable offshore plant jacking system characterized by having a vertical surface formed vertically to the left and right sides on the front block.