A novel large tonnage lifting system and method for offshore structures

Abstract

The application discloses a novel large-tonnage lifting system and method for offshore structures, three lifting arms are arranged on the left and right sides of the ship width direction and form a group, each lifting arm comprises a lifting beam and a Y-direction rectangular track, a main oil cylinder and an auxiliary oil cylinder are arranged at the inner end of the lifting beam, three corner points of a triangular lifting lever are hingedly connected with the lifting beam, the bottom of a longitudinal lifting support and the output end of the main oil cylinder, the output end of the auxiliary oil cylinder is connected to the triangular side between the main oil cylinder and the first lifting beam, six auxiliary oil cylinders are started, the triangular lifting lever of the first group obtains a clockwise upward force, the triangular lifting lever of the second group obtains a counterclockwise upward force, and active wave compensation is realized; when the upward force applied to each lifting arm reaches 80%, six main oil cylinders are started to lift the structure; the application guarantees that the upper end surface of the platform is effectively close to the bottom of the platform under the influence of the ship roll and pitch caused by the sea wave, and reduces the occurrence of the sliding phenomenon.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, specifically to a large-tonnage lifting system for offshore structures, used for dismantling offshore structures. Background Technology

[0002] Offshore structures can be viewed as a single building that faces dismantling after its service life. Currently, the traditional dismantling method involves using lifting equipment on crane ships to hoist structural modules. However, during hoisting, these modules are subject to wave impacts and wind loads, causing the ship and the structure to move with the waves. Since there is no connection between the structure and the ship's lifting equipment, slippage often occurs, leading to pressure imbalances on the ship and, in severe cases, capsizing. Furthermore, the wave impact causes the ship to oscillate back and forth, resulting in repeated collisions between the ship and the structure, causing damage to the ship's hull.

[0003] Chinese Patent Publication No. CN214216096U discloses a ship lifting system for supporting offshore work platforms. This lifting system uses a guide groove on a fixed base and a sliding bracket placed within the guide groove. The contraction of a telescopic cylinder drives a transmission rod to rotate around its hinge, forming a lever structure. This drives the sliding bracket to rise and fall along the guide groove. This reduces the vertical height occupied by the telescopic cylinder or by using gears, racks, or lead screws, thus increasing the effective lifting height of the sliding bracket for the offshore work platform. Furthermore, since the transmission rod is slidably connected to a slide rail on the sliding bracket via a sliding assembly, the sliding between the two replaces the horizontal movement of the sliding bracket itself, improving the stability of the sliding bracket in supporting the offshore work platform. However, in this type of lifting system, the telescopic cylinder bears the load transmitted from the lifted object for a long time, which can easily cause damage to the hydraulic system. Furthermore, the guide grooves, transmission rods, and other components used are only suitable for lifting small structures and cannot meet the lifting requirements of large tonnage structures. Moreover, there are no corresponding structures or methods to deal with the effects of the ship rolling or pitching under the influence of waves. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the above-mentioned lifting process by proposing a novel large-tonnage lifting system and lifting method for offshore structures, which prevents slippage between the structure and the lifting system when subjected to waves during the lifting process.

[0005] To achieve the above objectives, the present invention provides a novel large-tonnage lifting system for marine structures, employing the following technical solution: Three lifting arms are arranged as a group on each of the left and right sides of the hull's width direction. The two groups of lifting arms have identical structures and are symmetrical along the hull. The three lifting arms in each group are arranged side-by-side along the Y-direction and above mutually parallel X-direction rectangular tracks and X-direction rectangular raceways. Each lifting arm includes a lifting beam and a Y-direction rectangular raceway. The lifting beam is placed parallel to the upper surface of the Y-direction rectangular raceway and can slide back and forth along the raceway in both inward and outward directions. The Y-direction rectangular raceway connects an outer support member and an inner support member. The outer support member is located in the middle section of the lifting beam, and its bottom is slidably connected to an X-direction slide rail on the X-direction rectangular track. The bottom of the inner support member rolls into contact with the X-direction rectangular raceway, causing the lifting beam... The crane moves back and forth along the X-axis rectangular track and X-axis rectangular raceway in the front-to-back direction; a displacement sensor is installed above the outer support; an active hydraulic cylinder and an auxiliary hydraulic cylinder are installed at the inner end of the lifting beam, and the output ends of the active hydraulic cylinder and the auxiliary hydraulic cylinder are both hinged to a triangular lifting lever. The triangular lifting lever is hinged to the bottom of the longitudinal lifting platform, and the top of the longitudinal lifting platform is hinged to a transverse H-shaped lifting platform. The three corner points of the triangular lifting lever are respectively hinged to the lifting beam, the bottom of the longitudinal lifting platform, and the output end of the active hydraulic cylinder; the output end of the auxiliary hydraulic cylinder is connected to the side of the triangle between the active hydraulic cylinder and the first lifting beam; a parallel mechanism is connected between the longitudinal lifting platform and the lifting beam. The parallel mechanism is located on the outside of the longitudinal lifting platform, with its inner end hinged to the longitudinal platform and its outer end hinged to the upper surface of the lifting beam.

[0006] The technical solution adopted in the lifting method of the novel large-tonnage lifting system for offshore structures is as follows:

[0007] The hull is positioned between six booms on the left and right sides of the marine structure. The six booms are moved to align with the two vertices and the midpoint of the two sides facing each other at the bottom of the structure. The six parallel mechanisms are all horizontal and move in the Y direction to a position below the six points at the bottom of the structure.

[0008] Six auxiliary hydraulic cylinders are activated. The triangular lifting levers on the three lifting arms of the first group receive a counterclockwise lifting force, while the triangular lifting levers on the three lifting arms of the second group receive a clockwise lifting force, thus achieving active wave compensation.

[0009] When the jacking force applied to each lifting arm reaches 80%, the six active hydraulic cylinders are activated, and the transverse H-shaped lifting platform gains vertical displacement, lifting the structure.

[0010] The advantages of this invention using the above technical solution are:

[0011] 1. This invention adjusts the ship's ballast water to move the lifting platform to a suitable working distance, triggering the Y-axis compensation cylinder and Y-axis drive to wave compensation mode, so that the lifting platform is in close contact with the lower surface of the structure. The bracket can rotate around the X and Y axes at small angles to adapt to ensure that the upper surface of the platform is effectively in contact with the bottom of the platform under the influence of the ship's roll and pitch caused by the waves, thereby reducing the possibility of slippage.

[0012] 2. The hydraulic system of this invention is equipped with a locking pin, the end of which abuts against the plane of the lower part of the lifting lever, so that the platform load borne by the oil cylinder is transferred to the lifting beam through the locking pin. This avoids the problem of the oil cylinder being easily damaged by the load transmitted from the lifted object for a long time, improves the service life of the machine, and reduces wear and tear.

[0013] 3. This invention utilizes displacement sensors to measure the positional deviation of the structure relative to the boom in the X or Y direction under wave-like conditions, and can compensate for this deviation by coordinating the position and state of each boom.

[0014] 4. When the lifting platform is against the bottom of the offshore structure, a preload is applied to secure the platform in contact with the structure. To maintain this fixed contact, a vertical floating compensation state is adopted to counteract the effects of wave undulation. When the preload reaches 80%, a button triggers the simultaneous and rapid lifting of all lifting arms, raising the structure out of the range where it might collide with the fixed object below under the action of waves and then moving it away. This ensures safety, improves efficiency, and avoids accidents.

[0015] 5. The lifting beam in this invention has outward and inward support, and can move flexibly along the X track in the X direction. At the same time, it can also extend and retract between the X track and the X track using the Y-axis roller, which facilitates the lifting of large-tonnage marine structures.

[0016] 6. The working efficiency of this invention is improved compared with the traditional lifting system, and the safety is guaranteed. Wave compensation can be performed to avoid accidents. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a single-sided structure of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of the local structure;

[0019] Figure 3 for Figure 2 Enlarged view of a partial structure at the inner end of a single lifting arm;

[0020] Figure 4 for Figure 3Schematic diagram of the lifting arm in the mid-position;

[0021] Figure 5 for Figure 3 Schematic diagram of the lifting arm at its upper limit position;

[0022] Figure 6 for Figure 3 Schematic diagram of the lifting arm at its lower limit position;

[0023] Figure 7 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure. Detailed Implementation

[0025] To clearly illustrate the technical features of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. The X direction is along the bow and stern direction, which is also the fore-and-aft direction. The direction closer to the bow is forward, and the direction closer to the stern is aft. The Y direction is the width direction of the ship, which is the inward and outward direction. The direction closer to the center of the ship is inward, and the direction closer to the sea is outward. Therefore, they should not be construed as limitations on this invention.

[0027] like Figure 1 As shown, the present invention discloses a novel large-tonnage lifting system for marine structures, comprising an X-direction rectangular track 001, an X-direction rectangular roller track 002, and three identical lifting arms arranged side-by-side along the X-direction. The X-direction rectangular track 001 and the X-direction rectangular roller track 002 are parallel to each other at the same horizontal height, with the X-direction rectangular track 001 on the outer side and the X-direction rectangular roller track 002 on the inner side, arranged one inside and one outside on the hull and fixed to the hull. The three identical lifting arms are designated as first lifting arm 01, second lifting arm 02, and third lifting arm 03, located above the X-direction rectangular track 001 and the X-direction rectangular roller track 002, perpendicular to them on the horizontal plane, and arranged in an inward and outward direction.

[0028] like Figure 2As shown, the third lifting arm 03 includes a first lifting beam 101 and a Y-direction rectangular raceway 003. The bottom of the third lifting arm 03 is the Y-direction rectangular raceway 003, which is perpendicular to the X-direction rectangular track 001 and the X-direction rectangular raceway 002. The first lifting beam 101 is placed parallel to the upper surface of the Y-direction rectangular raceway 003 and can slide back and forth along the Y-direction rectangular raceway 003 in the inward and outward directions, thereby changing the inward and outward positions of the first lifting beam 101. The Y-direction rectangular raceway 003 is connected to both the outer support member 102 and the inner support member 103. The outer support member 102 is located at the middle section of the first lifting beam 101 and is used to support the Y-direction rectangular raceway 003 and the first lifting beam 101. Simultaneously, the bottom of the outer support member 102 is slidably connected to the X-direction slide rail 004, which is mounted on the X-direction rectangular track 001. The outer support member 102 can drive the first lifting beam 101 and the Y-direction rectangular raceway 003 to move back and forth along the X-direction slide rail 004, performing telescopic movements. The inner support member 103 is located at the inner end of the first lifting beam 101, supporting the Y-direction rectangular raceway 003 and the first lifting beam 101. The bottom of the inner support member 103 is in rolling contact with the X-direction rectangular raceway 002, driving the first lifting beam 101 and the Y-direction rectangular raceway 003 to move back and forth along the X-direction rectangular raceway 002. This allows the first lifting beam 101 to move back and forth along the X-direction rectangular track 001 and the X-direction rectangular raceway 002. Therefore, the first lifting arm 01 can make flexible adjustments along the X and Y directions, making the lifting operation more efficient.

[0029] The first lifting beam 101 consists of two rectangular steel plates with identical structures. The two rectangular steel plates are arranged one in front of the other along the X direction and are placed on the upper surface of the rectangular raceway 003 in the Y direction.

[0030] The positioning movement is achieved by an X-axis drive motor 105 providing power in the X direction and a Y-axis drive motor 104 providing power in the Y direction, with a maximum X-axis positioning movement speed of 0.1 m / s and a maximum Y-axis positioning movement speed of 0.2 m / s. The Y-axis drive motor 104 is fixedly mounted on the outer support member 102, and its output end is fixedly connected to the first lifting beam 101, providing it with power. The X-axis drive motor 105 is fixed to the hull, and its output end is fixedly connected to the outer support member 102 and the inner support member 103 respectively, simultaneously driving the outer support member 102 and the inner support member 103 to move back and forth.

[0031] A locking device 006 is installed at the lower end of the outer support member 102, which can lock the outer support member 102 at any time to fix the position of the first lifting beam 101 in the X direction. A locking device 007 is installed on the first lifting beam 101, which can fix the position of the first lifting beam 101 in the Y direction at any time.

[0032] The hydraulic control system 201, high-pressure gas tank 202, and accumulator 203 are welded onto the first lifting beam 101. The accumulator 203 is installed on the pipeline of the hydraulic control system 201, and the high-pressure gas tank 202 is connected to the accumulator 203 through a gas pipe.

[0033] A first displacement sensor I is installed above the outer support member 102 to detect the position of the offshore structure.

[0034] like Figure 3 As shown, an active hydraulic cylinder 204 and an auxiliary hydraulic cylinder 205 are installed at the inner end of the first lifting beam 101. The active hydraulic cylinder 204 is a lifting cylinder, and the auxiliary hydraulic cylinder 205 is a compensating cylinder. The cylinder bodies of the active hydraulic cylinder 204 and the auxiliary hydraulic cylinder 205 are fixedly connected to the first lifting beam 101 through fixed supports. The input ends of the active hydraulic cylinder 204 and the auxiliary hydraulic cylinder 205 are respectively connected to the hydraulic control system 201, which controls the operation of the active hydraulic cylinder 204 and the auxiliary hydraulic cylinder 205.

[0035] The output ends of both the active hydraulic cylinder 204 and the auxiliary hydraulic cylinder 205 are hinged to the same triangular lifting lever 301, which is hinged to a lifting platform. The lifting platform consists of a longitudinal lifting platform 312 and a transverse H-shaped lifting platform 401. The longitudinal lifting platform 312 is arranged vertically, while the transverse H-shaped lifting platform 401 is arranged horizontally, with the H-shaped platform 401 positioned above the longitudinal lifting platform 312. The triangular lifting lever 301 is hinged to the bottom of the longitudinal lifting platform 312, and the top of the longitudinal lifting platform 312 is hinged to the transverse H-shaped lifting platform 401. A damper is connected between the lower middle part of the longitudinal lifting platform 312 and the bottom of the H-shaped transverse platform 401 to mitigate vibrations and optimize the structural design.

[0036] The three corners of the triangular lifting lever 301 are respectively hinged to the first lifting beam 101, the bottom of the longitudinal lifting platform 312, and the output end of the active cylinder 204. The output end of the auxiliary cylinder 205 is connected to the side of the triangle between the active cylinder 204 and the first lifting beam 101.

[0037] A parallel mechanism 411 is connected between the longitudinal lifting platform 312 and the first lifting beam 101. The parallel mechanism 411 is located outside the longitudinal lifting platform 312. The parallel mechanism 411 consists of two connecting rods. The inner ends of the two connecting rods are hinged to the longitudinal platform 312, and the outer ends are hinged to the upper surface of the first lifting beam 101. They can rotate in the same direction as the triangular lifting lever 301, providing a buffering and auxiliary function.

[0038] like Figure 2 , Figure 3As shown, due to the undulations of the waves, the hull is prone to rolling and pitching during the lifting process. To eliminate this effect, firstly, the Y-direction drive motor 104 operates, and the first lifting beam 101 slides inward and outward along the Y direction under the action of the Y-direction drive motor 105. According to the position of the structure, the first lifting beam 101 slides to the corresponding position. Secondly, the X-direction drive motor 105 operates, applying power in the X direction to the first lifting beam 101 to complete the adjustment of the first lifting beam 101 in the X direction. The active cylinder 204 operates, pushing the triangular lifting lever 301 to rotate counterclockwise, raising the longitudinal lifting platform 312, providing power in the Z direction (vertical direction) to the transverse H-shaped lifting platform 401, so that the transverse H-shaped lifting platform abuts against the bottom of the structure. At this time, the auxiliary cylinder 205 operates, powered by the accumulator 203, driving the auxiliary cylinder 205 to extend and retract, providing a jacking force to the transverse H-shaped lifting platform 401, realizing the compensation function.

[0039] When the ship pitches, the first displacement sensor I measures the structural offset in the X direction and activates the X-direction drive motor 105, causing the first lifting beam 101 to move along the X direction by a distance equal to the structural offset measured by the first displacement sensor I. When the ship rolls, the first displacement sensor I measures the structural offset in the Y direction and activates the Y-direction drive motor 104, causing the first lifting beam 101 to extend and retract along the Y direction by a distance equal to the structural offset measured by the first displacement sensor I. This adjustment of the distance of the first lifting beam 101 in the X or Y direction is used for wave compensation.

[0040] like Figure 3 As shown, due to the prolonged transportation process, the hydraulic system remains under high pressure for an extended period. This high pressure has a significant negative impact on the hydraulic system and can easily cause damage. To mitigate this impact, a locking pin 302 is installed on the outer side of the triangular lifting lever 301. The locking pin 302 is horizontally arranged in the inward and outward directions. The outer end of the locking pin 302 is connected to the first lifting beam 101, and the inner end of the locking pin 302 rests against the plane at the bottom of the triangular lifting lever 301. The load borne by the hydraulic cylinder is transferred to the mechanical structure of each lifting beam via the locking pin 302.

[0041] The transverse H-shaped lifting platform 401 and parallel mechanism 411 have three positions to facilitate lifting operations in various situations, making the lifting work more flexible and efficient. The first position is the center position, with the parallel mechanism 411 horizontal, such as... Figure 4As shown; the second position is the upper limit position, where the active cylinder 204 extends and retracts. Through the hinge point O at the output end of the active cylinder 204, the triangular lifting lever 301 rotates counterclockwise around the hinge point O. The parallel mechanism 411 rotates in the same direction as the triangular lifting lever 301. Under the action of the triangular lifting lever 301 and the parallel mechanism 411, the lifting platform 401 moves vertically upward. The parallel mechanism 411 forms a 30-degree elevation angle α with the horizontal direction, as shown. Figure 5 As shown. The third position is the lower limit position. The active cylinder 204 retracts, transmitting the force to the triangular lifting lever 301 through the hinge point O. The triangular lifting lever 301 rotates clockwise around point O. The parallel mechanism 411 rotates in the same direction as the triangular lifting lever 301. Under the action of the triangular lifting lever 301 and the parallel mechanism 411, the transverse H-shaped lifting platform 401 moves vertically downward. The parallel mechanism 411 forms a 30-degree downward angle β with the horizontal direction. Figure 6 As shown.

[0042] like Figure 7 As shown, this invention installs three lifting arms on each of the left and right sides of the hull in the width direction, forming a set. The two sets of lifting arms on the left and right sides have identical structures and are symmetrical along the hull, for a total of six lifting arms working in coordination. When the six lifting arms are working in coordination, the hull is positioned so that the offshore structure is between the six lifting arms on the left and right sides. At this time, the X-direction drive motors of all lifting arms are activated. Under the action of the X-direction drive motors, the first lifting arm 01 moves in the X direction and aligns with point A of the structure, as shown. Figure 8 In the structure shown, point A is the first vertex of the first bottom edge. The second lifting arm 02 moves in the X direction to align with point B of the structure, which is the midpoint of the first bottom edge. The third lifting arm 03 moves in the X direction to align with point C of the structure, which is the second vertex of the first bottom edge. The fourth lifting arm 04 moves in the X direction to align with point D of the structure, which is the second vertex of the second bottom edge. The fifth lifting arm 05 moves in the X direction to align with point E of the structure, which is the midpoint of the third bottom edge. The sixth lifting arm 06 moves in the X direction to align with point F of the structure, which is the second vertex of the third bottom edge. In other words, the six lifting arms move to align with the two vertices and the midpoint of the two facing sides of the bottom of the structure.

[0043] At this time, the corresponding transverse H-shaped lifting platforms 401-406 on the six lifting arms are all in the middle position. According to the height of the structure, the Y-direction drive motors on each lifting arm are started. Under the action of the Y-direction drive motors, the first lifting beam 101, the second lifting beam 102, the third lifting beam 103, the fourth lifting beam 104, the fifth lifting beam 105, and the sixth lifting beam 106 move in the Y direction, moving to the position below the six points A, B, C, D, E, and F of the structure, respectively. Then, the auxiliary cylinders of each lifting arm are activated, extending them. The corresponding triangular lifting levers 301, 302, and 303 on the first lifting arm 01, second lifting arm 02, and third lifting arm 03 receive a counter-clockwise upward force under the action of their respective auxiliary cylinders, bringing the three corresponding longitudinal lifting platforms firmly against points A, B, and C on the structure. Similarly, the triangular lifting levers 304, 305, and 306 on the fourth lifting arm 04, fifth lifting arm 05, and sixth lifting arm 06 receive a clockwise upward force under the action of their respective auxiliary cylinders, bringing the corresponding longitudinal lifting platforms firmly against points D, E, and F on the structure. This method enables active wave compensation.

[0044] like Figure 7 , Figure 8As shown, when the hull rolls, taking the hull tilting to the left as an example, the first displacement sensor I on the first lifting arm 01 measures the offset distance of point A of the structure relative to the transverse H-shaped lifting platform 401 in the Y direction; the second displacement sensor II on the second lifting arm 02 measures the offset distance of point B of the structure relative to the transverse H-shaped lifting platform 402 in the Y direction; the third displacement sensor III on the third lifting arm 03 measures the offset distance of point C of the structure relative to the transverse H-shaped lifting platform 403 in the Y direction; and the fourth displacement sensor IV on the fourth lifting arm 04 measures the offset distance of point D of the structure relative to the transverse H-shaped lifting platform 404 in the Y direction. The fifth displacement sensor V on the fifth lifting arm 05 measures the offset distance of point E of the structure relative to the transverse H-shaped lifting platform 405 in the Y direction, and the sixth displacement sensor VI on the sixth lifting arm 06 measures the offset distance of point F of the structure relative to the transverse H-shaped lifting platform 406 in the Y direction. At this time, under the action of the Y-direction drive motor driving each lifting arm, the first lifting arm 01, the second lifting arm 02, and the third lifting arm 03 retract along the Y direction, and the retraction distance is, in turn, the distance of the retraction of points A, B, and C of the structure relative to the corresponding Y-direction offset distance measured by the first sensor I, the second sensor II, and the third sensor III. The fourth lifting arm 04, the fifth lifting arm 05, and the sixth lifting arm 06 extend along the Y direction, and the extension distance is, in turn, the distance of the extension of points D, E, and F of the structure relative to the corresponding Y-direction offset distance measured by the fourth sensor IV, the fifth sensor V, and the sixth sensor VI. The auxiliary cylinders of each lifting arm are activated. The auxiliary cylinders on the first lifting arm 01, second lifting arm 02, and third lifting arm 03 extend respectively, providing a counterclockwise pushing force to the triangular lifting levers 301, 302, and 303, ensuring that points A, B, and C are effectively pressed against the transverse H-shaped lifting platforms 401, 402, and 403 respectively. The auxiliary cylinders on the fourth lifting arm 04, fifth lifting arm 05, and sixth lifting arm 06 extend respectively, providing a clockwise pushing force to the triangular lifting levers 304, 305, and 306, ensuring that points D, E, and F are effectively pressed against the transverse H-shaped lifting platforms 404, 405, and 406 respectively.

[0045] like Figure 7 , Figure 8As shown, when the applied jacking force on each lifting arm reaches 80%, the active cylinders on each lifting arm are activated. The active cylinders extend and retract, causing the triangular lifting lever 301 on the first lifting arm 01 to rotate counterclockwise, resulting in vertical displacement of the transverse H-shaped lifting platform 401. Simultaneously, the triangular lifting levers 302 and 303 on the second and third lifting arms 02 and 03, under the action of their respective active cylinders extending and retracting, rotate counterclockwise, providing vertical displacement to the transverse H-shaped lifting platforms 402 and 403, respectively. In a synchronized manner, the triangular lifting levers 304, 305, and 306 on the fourth, fifth, and sixth lifting arms 04 and 06, respectively, rotate clockwise under the action of their respective active cylinders, thus providing vertical displacement to the transverse H-shaped lifting platforms 404, 405, and 406. All these actions occur synchronously, lifting the structure and safely driving it away.

[0046] like Figure 7 , Figure 8As shown, when the hull pitches, taking the hull tilting along the bow direction as an example, the first displacement sensor I on the first lifting arm 01 measures the offset distance of point A of the structure relative to the transverse H-shaped lifting platform 401 in the X direction; the second displacement sensor II on the second lifting arm 02 measures the offset distance of point B of the structure relative to the transverse H-shaped lifting platform 402 in the X direction; the third displacement sensor III on the third lifting arm 03 measures the offset distance of point C of the structure relative to the transverse H-shaped lifting platform 403 in the X direction; the fourth displacement sensor IV on the fourth lifting arm 04 measures the offset distance of point D of the structure relative to the transverse H-shaped lifting platform 404 in the X direction; the fifth displacement sensor V on the fifth lifting arm 05 measures the offset distance of point E of the structure relative to the transverse H-shaped lifting platform 405 in the X direction; and the sixth displacement sensor VI on the sixth lifting arm 06 measures the offset distance of point F of the structure relative to the transverse H-shaped lifting platform 406 in the X direction. The X-axis drive motors on each lifting arm are activated. Lifting arms 01, 02, 03, 04, 05, and 06 move in the X-direction along the bow direction, respectively. The moving distances are the X-direction distances of the six points A, B, C, D, E, and F of the structure relative to their corresponding transverse H-shaped lifting platforms, as measured by displacement sensors I, II, III, IV, V, and VI. Under the action of the auxiliary cylinders on each lifting arm, the auxiliary cylinders on lifting arms 01, 02, and 03 extend and retract, providing a counterclockwise pushing force to the triangular lifting levers 301, 302, and 303, respectively, ensuring that points A, B, and C are effectively pressed against the transverse H-shaped lifting platforms 401, 402, and 403. The auxiliary cylinders on the fourth lifting arm 04, the fifth lifting arm 05, and the sixth lifting arm 06 extend and retract respectively, providing clockwise pushing force to the triangular lifting levers 304, 305, and 306, so that points D, E, and F are effectively pressed against the lifting platforms 404, 405, and 406 respectively.

[0047] like Figure 7 , Figure 8As shown, when the applied jacking force on each lifting arm reaches 80%, the active cylinders on each lifting arm are activated. The active cylinders extend and retract, causing the triangular lifting lever 301 on the first lifting arm 01 to rotate counterclockwise, resulting in vertical displacement of the transverse H-shaped lifting platform 401. Simultaneously, the triangular lifting levers 302 and 303 on the second and third lifting arms 02 and 03, under the action of their respective active cylinders extending and retracting, rotate counterclockwise, providing vertical displacement to the lifting platforms 402 and 403, respectively. In a synchronized manner, the triangular lifting levers 304, 305, and 306 on the fourth, fifth, and sixth lifting arms 04 and 06, respectively, rotate clockwise under the action of their respective active cylinders, thus providing vertical displacement to the transverse H-shaped lifting platforms 404, 405, and 406. All these actions occur synchronously, lifting the structure and safely driving it away.

[0048] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A novel large-tonnage lifting system for offshore structures, characterized by: The ship has three lifting arms on each of the left and right sides in the width direction. The two sets of lifting arms have the same structure and are symmetrical along the left and right sides of the ship. The three lifting arms in one set are arranged in parallel along the Y direction and are located above the X-direction rectangular track (001) and X-direction rectangular raceway (002) that are parallel to each other. Each boom includes a lifting beam and a Y-axis rectangular raceway (003). The lifting beam is placed parallel to the upper surface of the Y-axis rectangular raceway (003) and can slide back and forth along the Y-axis rectangular raceway (003) in the inward and outward directions. The Y-axis rectangular raceway (003) connects an outer support member (102) and an inner support member (103). The outer support member (102) is located in the middle section of the lifting beam, and its bottom is slidably connected to an X-axis slide rail (004) on an X-axis rectangular track (001). The bottom of the inner support member (103) rolls into contact with the X-axis rectangular raceway (002), so that the lifting beam moves back and forth along the X-axis rectangular track (001) and the X-axis rectangular raceway (002) in the forward and backward directions. A displacement sensor is provided above the outer support member (102). An active hydraulic cylinder (204) and an auxiliary hydraulic cylinder (205) are provided at the inner end of the lifting beam. The output ends of the active hydraulic cylinder (204) and the auxiliary hydraulic cylinder (205) are both hinged to a triangular lifting lever (301). The triangular lifting lever (301) is hinged to the bottom of the longitudinal lifting platform (312). The top of the longitudinal lifting platform (312) is hinged to a transverse H-shaped lifting platform (401). The three corner points of the triangular lifting lever (301) are respectively hinged to the lifting beam, the bottom of the longitudinal lifting platform (312), and the output end of the active hydraulic cylinder (204). The output end of the auxiliary hydraulic cylinder (205) is connected to the triangular side between the active hydraulic cylinder (204) and the first lifting beam (101). A parallel mechanism (411) is connected between the longitudinal lifting platform (312) and the lifting beam. The parallel mechanism (411) is located outside the longitudinal lifting platform (312). The inner end of the parallel mechanism (411) is hinged to the longitudinal lifting platform (312), and the outer end is hinged to the upper surface of the lifting beam.

2. The novel large-tonnage lifting system for offshore structures according to claim 1, characterized in that: The outer support member (102) is provided with a Y-axis drive motor (104), and the output end of the Y-axis drive motor (104) is fixedly connected to the lifting beam; the hull is provided with an X-axis drive motor (105), and the output end of the X-axis drive motor (105) is fixedly connected to the outer support member (102) and the inner support member (103) respectively.

3. A novel large-tonnage lifting system for offshore structures according to claim 1, characterized in that: The lifting beam consists of two identical rectangular steel plates arranged one in front of the other.

4. A novel large-tonnage lifting system for offshore structures according to claim 1, characterized in that: The lower end of the outer support member (102) is provided with a locking device (006) that can lock the outer support member (102); the lifting beam is provided with a locking device (007) that can lock the lifting beam.

5. A lifting method for a large-tonnage lifting system as described in claim 1, characterized in that: The hull is positioned between the six booms that place the marine structure on the left and right sides. The six booms are moved to the two vertices and the middle point of the two sides facing each other at the bottom of the structure, respectively. The six parallel mechanisms (411) are all horizontal and move in the Y direction to the position below the six points at the bottom of the structure. Six auxiliary hydraulic cylinders are activated. The triangular lifting levers (301) on the three lifting arms of the first group obtain a counterclockwise lifting force, and the triangular lifting levers (301) on the three lifting arms of the second group obtain a clockwise lifting force, thus achieving active wave compensation. When the jacking force applied to each lifting arm reaches 80%, the six active hydraulic cylinders are activated, and the transverse H-shaped lifting platform (401) gains vertical displacement, lifting the structure.

6. The lifting method according to claim 5, characterized in that: When the ship rolls and pitches, the lifting beam moves along the X and Y directions to the position of the structure, the active hydraulic cylinder works, pushing the triangular lifting lever to rotate counterclockwise, and the transverse H-shaped lifting platform abuts against the bottom of the structure; the auxiliary hydraulic cylinder extends and retracts to achieve compensation.

7. The lifting method according to claim 5, characterized in that: When the ship pitches, the displacement sensor measures the offset of the structure in the X direction, and the distance the lifting beam moves along the X direction is the offset; when the ship rolls, the displacement sensor measures the offset of the structure in the Y direction, and the distance the lifting beam moves along the X direction is the offset in the Y direction.

8. The lifting method according to claim 5, characterized in that: The parallel mechanism (411) has three positions: parallel to the horizontal direction, 30 degrees of elevation, and 30 degrees of depression.

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