Hydraulic lifting system and self-elevating maritime work platform applying same

Abstract

The utility model discloses a hydraulic lifting system and a self-elevating maritime work platform applying the hydraulic lifting system, the hydraulic lifting system is used for a truss pile leg of the self-elevating maritime work platform, and the hydraulic lifting system comprises a pile fixing frame which is arranged on a mounting platform of the self-elevating maritime work platform and arranged outside the truss pile leg in a sleeving mode; a first guide mechanism matched with each chord member is arranged; the upper plug pin devices are in one-to-one correspondence with the chord members and can lock the chord members; the lower plug pin devices are in one-to-one correspondence with the chord members and can lock the chord members; the lifting ends of the main hydraulic lifting mechanisms are connected with the corresponding lower plug pin devices; the lifting ends of the auxiliary hydraulic lifting mechanisms are connected with the corresponding lower plug pin devices; each main hydraulic lifting mechanism and each auxiliary hydraulic lifting mechanism are each internally provided with a detector used for detecting the lifting distance and the lifting speed. Synchronous lifting of the chord members of the truss pile leg can be guaranteed, safety and reliability are improved, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to self-elevating offshore platforms, specifically to a hydraulic lifting system and a self-elevating offshore platform. Background Technology

[0002] As offshore engineering platforms develop towards larger and deeper water sizes, such as offshore wind power platforms, higher requirements are placed on their safety, reliability, efficiency, cost, and service life. As an important device for self-elevating offshore engineering platforms, the lifting system plays a crucial role. In water depths greater than 50 meters, the legs of self-elevating offshore engineering platforms mostly adopt a truss structure formed by multiple chords. The truss legs achieve relative movement between the truss legs and the installation platform through the lifting system, which can be a hydraulic lifting system.

[0003] The stiffness of truss pile legs plays a crucial role in their performance. Each chord of the pile leg is typically equipped with an independent hydraulic lifting mechanism. The maximum height difference between the various chords of the truss pile leg is called the chord phase difference, which is one of the important indicators for measuring the stiffness of the truss pile leg. If this value exceeds the maximum allowable value in the design, the truss pile leg may be at risk of deformation or even damage. However, existing hydraulic lifting systems for truss pile legs cannot effectively guarantee the synchronicity of the lifting of each chord, which can easily lead to large chord phase differences, resulting in problems such as pile leg deformation or even damage. This results in lower safety and reliability, as well as other issues such as lower structural stability, reduced service life, increased construction costs, and an inability to meet increasingly demanding practical requirements. Utility Model Content

[0004] The purpose of this application is to propose a hydraulic lifting system and a self-elevating offshore platform to ensure that the chords of the truss pile legs are raised and lowered synchronously, avoiding excessive phase difference between the chords which could lead to deformation or even damage of the truss pile legs, resulting in a more stable structure, improved safety and reliability, extended service life, and reduced construction costs.

[0005] To solve at least one of the above-mentioned technical problems, the technical solution of this application is as follows:

[0006] According to a first aspect of this application, a hydraulic lifting system is provided for the truss legs of a jack-up offshore platform. The truss legs include multiple chords arranged vertically and circumferentially along the truss legs, with adjacent chords connected by diagonal braces. The hydraulic lifting system includes: a pile fixing frame, mounted on the installation platform of the jack-up offshore platform and sleeved on the outside of the truss legs, and equipped with a first guide mechanism for cooperating with each chord; multiple sets of upper pin devices, each corresponding to a chord and capable of locking the chord; multiple sets of lower pin devices, each corresponding to a chord and capable of locking the chord; multiple main hydraulic lifting mechanisms, each corresponding to a chord and mounted on the installation platform, with their lifting ends connected to their respective lower pin devices; and multiple auxiliary hydraulic lifting mechanisms, each corresponding to a chord and mounted on the installation platform, with their lifting ends connected to their respective lower pin devices. Each main hydraulic lifting mechanism and each auxiliary hydraulic lifting mechanism has a built-in detector for detecting lifting distance and lifting speed, and the upper pin device on each chord is located below the lower pin device.

[0007] In one possible implementation of the first aspect described above, the pile frame is provided with a first through slot for each chord member to pass through, the opening of the first through slot facing the center of the truss pile leg, and a first guide mechanism is provided in the first through slot.

[0008] In one possible implementation of the first aspect described above, the first guiding mechanism includes: two first guide plates symmetrically arranged on two side walls of the first through slot, and a chord passing between the two first guide plates.

[0009] In one possible implementation of the first aspect described above, limiting baffles that respectively cooperate with two first guide plates are provided on the two side walls of the first through groove.

[0010] In one possible implementation of the first aspect described above, the hydraulic lifting system further includes: multiple ring beams, each set of upper pin devices and each set of lower pin devices being respectively installed on their respective corresponding ring beams, and the lifting ends of each main hydraulic lifting mechanism and each auxiliary hydraulic lifting mechanism being respectively connected to their respective corresponding ring beams.

[0011] In one possible implementation of the first aspect described above, each ring beam is provided with a second through slot for the chord member to pass through, the opening of the second through slot facing the center of the truss leg, and a second guide mechanism for cooperating with the chord member is provided in the second through slot.

[0012] In one possible implementation of the first aspect above, the second guiding mechanism includes: two sets of second guide plates symmetrically arranged on two side walls of the second through slot, with a chord passing between the two sets of second guide plates.

[0013] In one possible implementation of the first aspect above, each set of second guide plates includes two second guide plates arranged symmetrically in the upper and lower parts, and each set of upper pin devices includes two upper pin devices symmetrically located on both sides of the chord. Each upper pin device corresponds to a set of second guide plates and is located between two second guide plates arranged symmetrically in the upper and lower parts.

[0014] In one possible implementation of the first aspect described above, the chord is cylindrical, and each second guide plate is provided with an arcuate surface that mates with the outer surface of the chord.

[0015] In one possible implementation of the first aspect above, each lower pin device includes: a fixing pin, arranged in a horizontal direction, and pin holes for engaging with the fixing pin are arranged sequentially at intervals on both sides of each chord in a vertical direction; a drive mechanism, connected to the fixing pin, for driving the fixing pin to move in a horizontal direction so that the fixing pin is inserted into or disengaged from the corresponding pin hole.

[0016] In one possible implementation of the first aspect mentioned above, a first guide channel that cooperates with the fixing pin is also provided on the ring beam.

[0017] In one possible implementation of the first aspect described above, the pile fixing frame is set on the upper surface of the installation platform, and each main hydraulic lifting mechanism includes multiple main lifting cylinders arranged vertically and along the circumferential direction of the chord. Each main lifting cylinder has a built-in detector and its piston rod protruding end is connected to the corresponding ring beam with its protruding end facing upward. The detector is a displacement sensor that detects the extension and retraction amount and extension speed of the piston rod of the main lifting cylinder. Each main lifting cylinder is also provided with a first protective cover that cooperates with the detector.

[0018] In one possible implementation of the first aspect described above, each auxiliary hydraulic lifting mechanism includes a plurality of auxiliary lifting cylinders arranged vertically and circumferentially along the chord, the plurality of auxiliary lifting cylinders surrounding the outer side of the corresponding main hydraulic lifting mechanism, and each auxiliary lifting cylinder having a built-in detector.

[0019] In one possible implementation of the first aspect described above, the installation platform is provided with a plurality of first bases, a plurality of second bases, and a second guide channel for the truss pile legs to pass through. Each main lifting cylinder is installed on its corresponding first base, and each auxiliary lifting cylinder is installed on its corresponding second base. Each first base is located below each second base.

[0020] According to a second aspect of this application, a self-elevating offshore platform is provided, including the hydraulic lifting system described in the first aspect above.

[0021] The above-mentioned technical solution of this application has at least one of the following beneficial effects:

[0022] According to the hydraulic lifting system of this application, when the upper pin device locks the chord and the lower pin device releases the chord, the main hydraulic lifting mechanism drives the lower pin device and the chord to move up and down together. After the main hydraulic lifting mechanism reaches its position, the lower pin device locks the chord, the upper pin device releases the chord, and then the auxiliary hydraulic lifting mechanism drives the upper pin device and the chord to move up and down together. This alternating and repeated motion achieves the relative movement between the truss leg and the installation platform. Each main hydraulic lifting mechanism has a built-in detector that can detect its lifting distance and speed, and each auxiliary hydraulic lifting mechanism also has a built-in detector that can detect its lifting distance and speed, ensuring that all chords of the truss leg can rise and fall synchronously. This avoids problems such as excessive phase difference between chords leading to deformation or even damage of the truss leg. The fixed pile frame also ensures greater stability of the truss leg, and the first guide mechanism on the fixed pile frame can guide the movement of the truss leg, thus making the structure more stable, improving the safety and reliability of the equipment, extending its service life, reducing construction costs, and better meeting increasingly demanding usage requirements.

[0023] In addition, unless otherwise specified in the technical solution of this application, the technical solution can be implemented by conventional means in the field. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a front view of a hydraulic lifting system according to one embodiment of the present application, after removing the auxiliary hydraulic lifting mechanism and the upper pin device.

[0026] Figure 2 for Figure 1 Schematic diagram of the structure in the AA direction;

[0027] Figure 3 A front view of a hydraulic lifting system according to one embodiment of this application, after removing the main hydraulic lifting mechanism and the lower pin device;

[0028] Figure 4 for Figure 3 Schematic diagram of the structure in the middle BB direction;

[0029] Figure 5 for Figure 3 Schematic diagram of the CC-axis structure;

[0030] Figure 6This is a schematic diagram of the structure of a hydraulic lifting system according to one embodiment of this application after the removal of the fixed pile frame;

[0031] Figure 7 This is a top view of a hydraulic lifting system according to one embodiment of this application;

[0032] Figure 8 This is a partial structural diagram of the main lifting cylinder according to one embodiment of this application.

[0033] Explanation of the labels in the attached drawings:

[0034] 100 for fixing pile frame; 101 for first through channel; 110 for first guide mechanism; 111 for first guide plate;

[0035] Upper pin device 200;

[0036] Lower insertion pin device 300; fixed pin 301; drive mechanism 302;

[0037] Main hydraulic lifting mechanism 400; main lifting cylinder 410; piston rod 411; locking key 412; locking cap 413; shaft elastic retaining ring 414; first sealing ring 415; second sealing ring 416; guide ring 417; gasket 418; first protective cover 420; first base 430;

[0038] Auxiliary hydraulic lifting mechanism 500; Auxiliary lifting cylinder 510; Second base 520;

[0039] Ring beam 600; second through slot 601; second guide mechanism 610; second guide plate 611;

[0040] Detector 700;

[0041] Truss leg 10; chord 11; diagonal brace 12; pin hole 13;

[0042] Installation platform 20; second guide channel 21. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only some, not all, of the embodiments of this application, and are used merely to explain this application and are not intended to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," "outer," "both ends," "both sides," "bottom," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," "upper-level," "lower-level," "main," and "secondary," etc., are used for descriptive purposes only and can be simply used to more clearly distinguish different components, and should not be construed as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] See Figures 1-8 The diagram schematically illustrates a hydraulic lifting system provided according to an embodiment of this application, primarily used for the truss legs 10 of a self-elevating offshore platform (such as an offshore wind power platform), enabling relative movement between the installation platform 20 and the truss legs 10. The truss legs 10 include multiple chords 11 arranged vertically and along the circumference of the truss legs 10, with adjacent chords 11 connected by diagonal braces 12. The hydraulic lifting system of this application includes: a pile fixing frame 100, multiple sets of upper pin devices 200, multiple sets of lower pin devices 300, multiple main hydraulic lifting mechanisms 400, and multiple auxiliary hydraulic lifting mechanisms 500.

[0047] The pile fixing frame 100 is mounted on the installation platform 20 of the self-elevating offshore platform and is sleeved on the outside of the truss pile legs 10. The pile fixing frame 100 is equipped with a first guide mechanism 110 for cooperating with each chord member 11. Each chord member 11 corresponds to an upper pin device 200, a lower pin device 300, a main hydraulic lifting mechanism 400, and an auxiliary hydraulic lifting mechanism 500. The upper pin devices 200 and lower pin devices 300 can lock the chord member 11 respectively. The lifting end of each main hydraulic lifting mechanism 400 is connected to its corresponding lower pin device 300, and the lifting end of each auxiliary hydraulic lifting mechanism 500 is connected to its corresponding upper pin device 200. Each main hydraulic lifting mechanism 400 and each auxiliary hydraulic lifting mechanism 500 have built-in detectors 700 for detecting their lifting distance and lifting speed. For example, refer to... Figure 7 As shown, the chord 11 of the truss leg 10 can be three, the cross section of the truss leg 10 along the horizontal direction can be triangular, and the cross section of the fixed pile frame 100 along the horizontal direction can be approximately hexagonal, with the three vertices of the triangle located approximately at the midpoints of the three spaced sides of the hexagon.

[0048] When it is necessary to drive the truss leg 10 to move relative to the installation platform 20, a set of lower pin devices 300 of each chord 11 of the truss leg 10 first locks the chord 11 and the corresponding upper pin device 200 releases the chord 11. The corresponding main hydraulic lifting mechanism 400 drives the lower pin device 300 and the chord 11 to move up and down together. After the main hydraulic lifting mechanism 400 moves to the designated position, the upper pin device 200 locks the chord 11 and the lower pin device 300 releases the chord 11. Then the auxiliary hydraulic lifting mechanism 500 drives the upper pin device 200 and the chord 11 to move up and down together. This alternating and repeated movement is used to realize the relative movement between the truss leg 10 and the installation platform 20. During the relative movement between the truss leg 10 and the installation platform 20, the first guide mechanism 110 on the fixed pile frame 100 guides the movement of the truss leg 10. The detector 700 built into each main hydraulic lifting mechanism 400 detects its lifting distance and lifting speed, and the detector 700 built into each auxiliary hydraulic lifting mechanism 500 can detect its lifting distance and lifting speed, thereby ensuring that each chord 11 of the truss leg 10 rises and falls stably and synchronously, so that the height difference between the three chords 11 of the truss leg 10 is very small, ensuring that the truss leg 10 will not be deformed or even damaged due to large torque, thereby accurately controlling the position of the upper pin device 200 and the lower pin device 300, ensuring that all the pin devices that operate simultaneously can achieve synchronous pin changing action.

[0049] Therefore, the hydraulic lifting system of this application, with the fixed pile frame 100, can also ensure that the truss pile legs 10 are more stable. The detectors 700 built into each main hydraulic lifting mechanism 400 and each auxiliary hydraulic lifting mechanism 500 can detect their lifting distance and lifting speed respectively. The first guide mechanism 110 on the fixed pile frame 100 can also guide the movement of the truss pile legs 10, thereby ensuring that each chord 11 of the truss pile legs 10 moves stably and synchronously, avoiding problems such as excessive phase difference between the chords 11 of the truss pile legs 10, which could lead to deformation or even damage of the truss pile legs 10. In addition, it can accurately control the position of the upper pin device 200 and the lower pin device 300, ensuring that all the pin devices that move at the same time can achieve synchronous pin changing action. The structure is more stable, improving the safety and reliability of the equipment, extending the service life of the equipment, reducing construction costs, and better meeting the increasingly higher usage requirements.

[0050] In some embodiments, reference Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, the fixed pile frame 100 is provided with a first through slot 101 for each chord member 11 to pass through, and the opening of the first through slot 101 faces the center of the truss pile leg 10. Thus, the opening of the first through slot 101 allows the diagonal brace 12 connecting the chord member 11 to pass through, and at the same time, it can limit the chord member 11 to prevent the truss pile leg 10 from rotating, etc., making the structure more stable and reliable.

[0051] In some embodiments, reference Figure 4 As shown, the first guide mechanism 110 is disposed within the first through slot 101. This results in a more compact and stable structure, as well as a reduced volume.

[0052] For example, refer to Figure 4 As shown, the first guiding mechanism 110 includes two first guide plates 111, which are symmetrically arranged on the two side walls of the first through slot 101. The chord rod 11 passes between the two first guide plates 111, thereby guiding the up-and-down movement of the chord rod 11. This ensures more stable up-and-down movement of the chord rod 11, reduces wear on the chord rod 11, and extends the service life of the equipment.

[0053] Furthermore, limiting baffles (not shown in the figure) that cooperate with the two first guide plates 111 can be provided on the two side walls of the first through groove 101. Each first guide plate 111 can have limiting baffles on its upper, lower, left, and right sides. Thus, by providing limiting baffles, not only can the first guide plates 111 be limited, but the positioning, installation, and adjustment of the first guide plates 111 are also facilitated, making operation more convenient and faster.

[0054] In some embodiments, reference Figures 1-3 As shown in Figures 5 and 6, the hydraulic lifting system also includes multiple ring beams 600. Each upper pin device 200 corresponds to one ring beam 600, and each lower pin device 300 corresponds to one ring beam 600. Each upper pin device 200 and each lower pin device 300 are respectively mounted on their corresponding ring beams 600. The two ring beams 600 on each chord 11 are arranged vertically. The lifting ends of each main hydraulic lifting mechanism 400 and each auxiliary hydraulic lifting mechanism 500 are connected to their respective ring beams 600. This makes operation more convenient and the structure more stable and reliable.

[0055] In some embodiments, reference Figure 2 , Figure 5 As shown, each ring beam 600 is provided with a second through groove 601 for the chord member 11 to pass through. The opening of the second through groove 601 faces the center of the truss leg 10. The opening of the first through groove 101 allows the diagonal brace 12 connecting the chord member 11 to pass through. A second guide mechanism 610 for cooperating with the chord member 11 is also provided in the second through groove 601. Thus, the second through groove 601 can limit the movement of the chord member 11, and the second guide mechanism 610 can guide the movement of the chord member 11, thereby preventing the truss leg 10 from rotating circumferentially. The structure is more compact, stable, and reliable, reducing wear on the chord member 11 and extending the service life of the equipment.

[0056] For example, refer to Figure 2 , Figure 5 As shown, the second guiding mechanism 610 includes two sets of second guide plates 611, which are symmetrically arranged on the two side walls of the second through slot 601. The chord rod 11 passes through the two sets of second guide plates 611. Thus, the two sets of second guide plates 611 guide the chord rod 11, ensuring better movement of the chord rod 11.

[0057] Furthermore, each set of second guide plates 611 includes two second guide plates 611 arranged symmetrically vertically, and each set of upper pin devices 200 includes two upper pin devices 200 symmetrically located on both sides of the chord 11. Each upper pin device 200 corresponds to a set of second guide plates 611 and is located between the two symmetrically arranged second guide plates 611. As a result, the structure is more compact and stable, the force is more evenly distributed, and each set of upper pin devices 200 better locks the chord 11.

[0058] Furthermore, the chord member 11 can be cylindrical, and each second guide plate 611 is provided with an arc-shaped surface that mates with the outer surface of the chord member 11. This ensures better guidance of the chord member 11, resulting in greater stability and reliability.

[0059] In some embodiments, reference Figure 2As shown, each lower pin device 300 includes a fixing pin 301 and a drive mechanism 302. The fixing pin 301 is arranged horizontally, and each chord 11 has pin holes 13 spaced vertically on both sides for engaging with the fixing pin 301. The drive mechanism 302 is connected to the fixing pin 301 and drives the fixing pin 301 to move horizontally, causing the fixing pin 301 to insert into or disengage from the corresponding pin hole 13. The drive mechanism 302 can be a hydraulic cylinder or other suitable drive components in the prior art. This ensures that the lower pin device 300 can stably lock the chord 11. Furthermore, the structure of the upper pin device 200 is basically the same as that of the lower pin device 300, and will not be described further here.

[0060] Furthermore, the ring beam 600 is also provided with a first guide channel (not shown in the figure) that cooperates with the fixing pin 301. This ensures the stable movement of the fixing pin 301 and allows for locking.

[0061] In some embodiments, reference Figures 1-8 As shown, the pile fixing frame 100 is installed on the upper surface of the installation platform 20, such as the upper surface of the main deck of the installation platform 20. Each main hydraulic lifting mechanism 400 includes multiple main lifting cylinders 410 arranged vertically and along the circumference of the chord 11. For example, there can be four main lifting cylinders 410 symmetrically arranged along the circumference of the chord 11. Each main lifting cylinder 410 has a built-in detector 700, and the extended end of its piston rod 411 is connected to the corresponding ring beam 600 with its piston rod 411 extending upward. The detector 700 is a displacement sensor that detects the extension and retraction amount and speed of the piston rod 411 of the main lifting cylinder 410, such as a non-contact magnetostrictive displacement sensor. Each main lifting cylinder 410 is also equipped with a first protective cover 420 that cooperates with the detector 700. Thus, by driving the chord 11 to move through multiple main lifting cylinders 410, the stability and reliability of the equipment are improved, and the first protective cover 420 can also protect the detector 700, making it safer and more reliable.

[0062] For example, refer to Figure 8As shown, the main lifting cylinder 410 is provided with a piston rod 411 and a guide ring 417. The guide ring 417 is sleeved on the outside of the piston rod 411, and the outer wall of the guide ring 417 slides in contact with the inner cavity wall of the main lifting cylinder 410. The guide ring 417 and the piston rod 411 can be connected by a snap key 412. A snap cap 413 can be provided on the snap key 412. A shaft elastic retaining ring 414 that cooperates with the snap key 412 can be provided on the piston rod 411. A first sealing ring 415 (such as an O-ring) can be provided between the guide ring 417 and the piston rod 411. A second sealing ring 416 can also be provided between the guide ring 417 and the inner cavity wall of the main lifting cylinder 410. A gasket 418 (such as a copper washer) can also be provided at the bottom of the piston rod 411. The piston rod 411 can be hinged to the ring beam 600 via a connector. The connector can be a single-elbow joint (Type I) or a double-elbow joint (Type Y), etc. Both the connector and the ring beam 600 can have through holes for the pin to pass through. The pin's end can be locked using a clamping plate or similar structure, and the pin can have a groove that mates with the clamping plate. This simplifies operation.

[0063] For example, detector 700 employs a non-contact magnetostrictive displacement sensor, comprising a waveguide, a movable magnetic ring, and an electronic chamber. A current pulse is generated in the electronic chamber and transmitted along the waveguide to form a circumferential magnetic field. This causes the movable magnetic ring, fitted onto the waveguide, to generate an axial magnetic field. The intersection of these two magnetic fields triggers the magnetostrictive effect, generating a strain mechanical pulse signal within the waveguide that propagates to the electronic chamber. By measuring the time difference between the current pulse emission and the mechanical wave reception, the distance between the magnetic ring and the electronic chamber is calculated, achieving absolute measurement of the displacement. This measurement method offers high accuracy, reaching the micrometer level. Furthermore, the absence of mechanical contact between the magnetic ring and the waveguide effectively prevents wear, extends service life, and meets the requirements for reduced maintenance of offshore platform products. In practical use, it eliminates the need for repeated calibration, is unaffected by the complex and humid marine environment of salt spray, and exhibits no signal drift, thus ensuring measurement accuracy.

[0064] In some embodiments, reference Figure 5 As shown, each auxiliary hydraulic lifting mechanism 500 includes multiple auxiliary lifting cylinders 510 arranged vertically and along the circumference of the chord 11. Each auxiliary lifting cylinder 510 has a built-in detector 700. The multiple auxiliary lifting cylinders 510 surround the corresponding main hydraulic lifting mechanism 400, for example, four auxiliary lifting cylinders 510 are arranged outside four main lifting cylinders 410. This makes the structure more compact and stable. In addition, the structure of the auxiliary lifting cylinder 510 is basically the same as that of the main lifting cylinder 410. The auxiliary lifting cylinder 510 may also be equipped with a second protective cover (not shown in the figure) that cooperates with the detector 700, etc., which will not be described in detail here.

[0065] In some embodiments, reference Figures 1-6 As shown, the installation platform 20 is equipped with multiple first bases 430, multiple second bases 520, and a second guide channel 21 for the truss legs 10 to pass through. Each main lifting cylinder 410 is installed on its corresponding first base 430, and each auxiliary lifting cylinder 510 is installed on its corresponding second base 520. Each first base 430 is located below each second base 520. The cylinders and bases can be hinged using a single elbow joint (I-type) or a double elbow joint (Y-type) structure. This makes installation and disassembly operations more convenient and faster, and the structure more stable.

[0066] According to an embodiment of this application, a self-elevating offshore platform is also provided, including the hydraulic lifting system described above. The self-elevating offshore platform can be an offshore wind power platform, etc. Other devices of the self-elevating offshore platform can refer to corresponding mechanisms in the prior art, which will not be elaborated here.

[0067] Based on the various embodiments of this application described above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0068] The above descriptions are merely some embodiments of this application, used only to illustrate the technical solutions of this application, and not to limit it. It should be understood that those skilled in the art can make improvements or substitutions based on the above descriptions without departing from the inventive concept of this application, and all such improvements and substitutions should fall within the protection scope of this application. In this case, all details can be replaced with equivalent elements, and materials, shapes, and sizes can also be arbitrary.

Claims

1. A hydraulic lifting system for a truss leg of a jack-up offshore platform, the truss leg comprising a plurality of chord members arranged in a vertical direction and arranged in a circumferential direction of the truss leg, two adjacent chord members being connected by a diagonal brace member therebetween, characterized in that, The hydraulic lifting system includes: The pile fixing frame is set on the installation platform of the self-elevating offshore platform and sleeved on the outside of the truss pile legs, and is provided with a first guide mechanism for cooperating with each of the chord members; Multiple sets of upper pin devices are provided, each corresponding to a string member and capable of locking the string member; Multiple sets of lower pin devices are provided, each corresponding to a string member and capable of locking the string member; Multiple main hydraulic lifting mechanisms are arranged on the mounting platform, each corresponding to a chord member, and the lifting end is connected to the corresponding lower pin device. Multiple auxiliary hydraulic lifting mechanisms are provided on the mounting platform, each corresponding to a chord member, and the lifting end is connected to the corresponding lower pin device. Each of the main hydraulic lifting mechanisms and each of the auxiliary hydraulic lifting mechanisms is equipped with a detector for detecting the lifting distance and lifting speed, and the upper pin device on each chord is located below the lower pin device.

2. The hydraulic lifting system according to claim 1, characterized in that, The fixed pile frame is provided with a first through slot for each of the chord members to pass through, the opening of the first through slot facing the center of the truss pile leg, and the first guide mechanism is disposed in the first through slot.

3. The hydraulic lift system of claim 2, wherein, The first guiding mechanism includes: Two first guide plates are symmetrically arranged on the two side walls of the first through slot, and the chord passes through the space between the two first guide plates; The first through groove has two side walls equipped with limiting baffles that respectively cooperate with the two first guide plates.

4. The hydraulic lift system of claim 1, wherein, The hydraulic lifting system also includes: Multiple ring beams, each set of the upper pin device and each set of the lower pin device are respectively set on their respective ring beams, and the lifting end of each main hydraulic lifting mechanism and each auxiliary hydraulic lifting mechanism is respectively connected to their respective ring beams; Each of the ring beams is provided with a second through groove for the chord member to pass through, the opening of the second through groove facing the center of the truss pile leg, and a second guide mechanism for cooperating with the chord member is provided in the second through groove.

5. The hydraulic lift system of claim 4, wherein, The second guiding mechanism includes: Two sets of second guide plates are symmetrically arranged on the two side walls of the second through slot, and the chord passes between the two sets of second guide plates.

6. The hydraulic lift system of claim 5, wherein, Each set of second guide plates includes two second guide plates arranged symmetrically in the upper and lower parts. Each set of upper pin devices includes two upper pin devices symmetrically located on both sides of the chord. Each upper pin device corresponds to a set of second guide plates and is located between two second guide plates arranged symmetrically in the upper and lower parts. The chord is cylindrical, and each of the second guide plates is provided with an arc-shaped surface that matches the outer side of the chord.

7. The hydraulic lifting system according to claim 6, characterized in that, Each of the lower latching devices includes: A fixing pin is provided horizontally, and pin holes for engaging with the fixing pin are provided at intervals on both sides of each string in the vertical direction. A drive mechanism, connected to the fixing pin, is used to drive the fixing pin to move horizontally so that the fixing pin is inserted into or disengaged from the corresponding pin hole; The ring beam is also provided with a first guide channel that cooperates with the fixing pin.

8. The hydraulic lift system of claim 4, wherein, The pile fixing frame is set on the upper surface of the installation platform. Each main hydraulic lifting mechanism includes multiple main lifting cylinders arranged vertically and along the circumference of the chord. Each main lifting cylinder has a built-in detector, and the extended end of its piston rod is connected to the corresponding ring beam with its piston rod pointing upward. The detector is a displacement sensor that detects the extension and retraction amount and speed of the piston rod of the main lifting cylinder. Each main lifting cylinder is also provided with a first protective cover that cooperates with the detector.

9. The hydraulic lift system of claim 8, wherein, Each of the auxiliary hydraulic lifting mechanisms includes a plurality of auxiliary lifting cylinders arranged vertically and along the circumference of the chord, the plurality of auxiliary lifting cylinders surrounding the outside of the corresponding main hydraulic lifting mechanism, and each of the auxiliary lifting cylinders having the detector built in. The installation platform is provided with multiple first bases, multiple second bases, and a second guide channel for the truss pile legs to pass through. Each main lifting cylinder is installed on its corresponding first base, and each auxiliary lifting cylinder is installed on its corresponding second base. Each first base is located below each second base.

10. A jack-up offshore platform, characterised in that, Includes the hydraulic lifting system as described in any one of claims 1 to 9.

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