Weighing dsu device for float-over installation of large offshore platforms and method of use thereof

Abstract

The present application belongs to the field of ocean engineering, and particularly relates to a weighing DSU device for floating installation of a large offshore platform and a use method thereof. The device comprises a weighing system and an energy absorption system. The energy absorption system comprises a tension outer cylinder, a DSU elastic body, a tension flange A and a tension flange B. The tension outer cylinder internally contains the retractable DSU elastic body. The outer surface of the tension outer cylinder is provided with the tension flange A. The tension flange B is linked with the DSU elastic body. The lower end of the weighing system is connected with the tension flange B. The offshore platform is placed at the upper end of the weighing system. The tension flange B is connected with the tension flange A before the offshore platform is built. The DSU elastic body is in a compressed state. The tension flange B is disconnected with the tension flange A before the offshore platform is transferred to a barge. The tension flange B and the weighing system can be displaced along the vertical direction through the stretched DSU elastic body. The present application omits the working process of transferring the platform block to the DSF after the platform block is built and weighed, and reduces the construction process of platform weighing and center of gravity calibration.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering, specifically a weighing DSU device for floating installation on large offshore platforms and its usage method. Background Technology

[0002] With the development of offshore oilfield exploration and development and offshore converter stations, offshore platforms are gradually becoming larger, which places higher demands on the installation technology and operational capabilities of large offshore platforms. The traditional installation methods for the topside modules of offshore platforms exceeding 10,000 tons are generally divided into two types: hoisting and integral floating installation. Hoisting using large semi-submersible crane vessels is less common in deep-water applications due to its high cost and limited hoisting capacity; while the floating installation method is the most economical and reliable, and integral floating installation of the topside modules of large offshore platforms will become the development trend of offshore installation.

[0003] The Deck Separation Unit (DSU) is a key component in the application of the float-over construction technology. As a device connecting the top of the DSF (Deck Support Frame) to the large offshore platform module, it not only supports the large offshore platform module, but also buffers the impact force of the upper offshore platform module on the barge by absorbing energy itself. Moreover, during the installation of the large offshore platform module at sea, it works in conjunction with the Leg Mutation Unit (LMU) to ensure the smooth transfer of the large offshore platform module from the installation vessel to the jacket.

[0004] Offshore platform modules are massive in size and weight, and their center of gravity and actual weight directly affect the selection of the installation vessel and the docking devices for each leg. Therefore, weighing is crucial for the stability and safety of offshore platform module installation. Currently, when offshore platform modules are constructed on land, weighing jacks are installed at the bottom. After construction, these jacks are used to lift the offshore platform module, and weighing is also performed during the lifting process. A DSU (Digital Substation Unit) is placed inside each steel cylinder on the DSF (Digital Substation Frame). The DSF with the DSU installed is then moved under the offshore platform module, and the offshore platform module is lowered onto the DSF, at which point the DSU is compressed. The DSF and the upper offshore platform module are then transferred to the installation vessel via sliding for subsequent transportation and installation. Because offshore platform modules can weigh tens of thousands of tons, a large number of large-tonnage jacks are used for weighing, resulting in high costs. Furthermore, temporary fixed supports need to be erected for the jacks, and the strength requirements for the support points of the upper offshore platform module are higher, requiring welded ribs for reinforcement. The jacks are then removed after weighing, making the process cumbersome, time-consuming, and labor-intensive. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the current floating installation of offshore platforms, the purpose of this invention is to provide a weighing DSU device for the floating installation of large offshore platforms and its usage method.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] This invention relates to a weighing DSU device for floating installation on large offshore platforms, installed inside a cylinder on a DSF (Diverterless Superficial Floating Container). The device includes a weighing system and an energy-absorbing system. The energy-absorbing system comprises a tensioning outer cylinder, a DSU elastomer, a tensioning flange A, and a tensioning flange B. The tensioning outer cylinder houses a retractable DSU elastomer. Tensioning flange A is located on the outer surface of the tensioning outer cylinder. Tensioning flange B is linked to the DSU elastomer. The lower end of the weighing system is connected to tensioning flange B, and the upper module of the offshore platform is placed on top of the weighing system. Before the upper module of the offshore platform is constructed, tensioning flange B is connected to tensioning flange A, and the DSU elastomer is in a compressed state. After the upper module of the offshore platform is constructed and before transfer to the barge, tensioning flange B is disconnected from tensioning flange A. The tensioning flange B and the weighing system can be displaced vertically through the extended DSU elastomer.

[0008] Wherein: the tensioning outer cylinder is closed at the bottom and open at the top, and contains an elastic body cylinder that can be displaced relative to it in the vertical direction. The DSU elastic body is housed in the elastic body cylinder. The elastic body cylinder is displaced relative to the tensioning outer cylinder in the vertical direction by the action of the DSU elastic body, and is guided by a guide mechanism during the displacement process.

[0009] The guiding mechanism includes a guide seat and a guide block. The top of the elastic body cylinder is closed and the bottom is open. The guide seat is located at the bottom of the elastic body cylinder and is placed on the tensioning outer cylinder. The edge of the upper panel of the guide seat extends outward in the horizontal direction. The open end of the elastic body cylinder is provided with a guide block inward in the horizontal direction. The DSU elastomer is placed on the guide seat, and its two ends abut against the top of the guide seat and the elastic body cylinder, respectively. The elastic body cylinder moves in the vertical direction until the guide block abuts against the extension of the upper panel of the guide seat.

[0010] This invention relates to a weighing DSU device for floating installation on large offshore platforms, installed inside a cylinder on a DSF (Diverterless Superficial Container). The device includes a weighing system and an energy-absorbing system. The energy-absorbing system comprises a tensioning outer cylinder, a DSU elastomer, a tensioning flange A, and a DSF flange. The tensioning outer cylinder is placed on the DSF flange, and the expandable DSU elastomer is housed inside it. The tensioning flange A is located on the outer surface of the tensioning outer cylinder. The lower end of the weighing system is connected to the tensioning outer cylinder, and the upper module of the offshore platform is placed on top of the weighing system. Before the upper module of the offshore platform is constructed, the tensioning flange A is connected to the DSF flange on the DSF, and the DSU elastomer is in a compressed state. After the upper module of the offshore platform is constructed and before transfer to the barge, the tensioning flange A is disconnected from the DSF flange, and the tensioning outer cylinder and the weighing system can be vertically displaced through the extended DSU elastomer.

[0011] Wherein: the tensioning outer cylinder is closed at the top and open at the bottom, and has an elastic body cylinder inside. The elastic body cylinder is fixed to the tensioning outer cylinder or is an integral structure with the tensioning outer cylinder. The DSU elastic body is housed in the elastic body cylinder. The elastic body cylinder and the tensioning outer cylinder are displaced relative to the DSF flange in the vertical direction by the action of the DSU elastic body, and are guided by the guide mechanism during the displacement process.

[0012] The guiding mechanism includes a guide seat and a guide block. The top of the elastomer cylinder is closed and the bottom is open. The guide seat is located at the bottom of the elastomer cylinder and is placed on the DSF flange. The edge of the upper panel of the guide seat extends outward in the horizontal direction. The open end of the elastomer cylinder is provided with a guide block in the horizontal direction. The DSU elastomer is placed on the guide seat, and its two ends abut against the top of the guide seat and the elastomer cylinder, respectively. The elastomer cylinder and the tensioning outer cylinder are displaced in the vertical direction until the guide block abuts against the extension of the upper panel of the guide seat.

[0013] An adjustment plate is provided between the DSU elastomer and the upper panel of the guide seat.

[0014] The DSU elastomer includes multiple rubbers and multiple steel plates, which are stacked alternately on top of each other. Each rubber has a steel plate fixed to its top and bottom surfaces, and adjacent steel plates are fixed to each other.

[0015] The upper module of the offshore platform is bolted to the upper end of the weighing system, or the upper surface of the weighing system is a high-friction coefficient flange surface, and the upper module of the offshore platform is in contact with the high-friction coefficient flange surface.

[0016] The present invention relates to a method for using a weighing DSU device for the floating installation of large offshore platforms: To ensure the stability of the construction process of the upper module of the offshore platform, a vertical load is applied to the weighing DSU device before installation on the DSF, so that the DSU elastomer is in a compressed state. The energy absorption system is locked by connecting the tensioning flange A and the tensioning flange B or by connecting the tensioning flange A and the DSF flange. Then, multiple weighing DSU devices are set on the DSF as fulcrums. The weighing DSU devices are installed in the cylinder at the fulcrum position or bolted to the welding plate of the DSF corresponding to the fulcrum position. The upper module of the offshore platform is constructed on the DSF. During the construction process, the weighing system in the weighing DSU device at each fulcrum can monitor and transmit the force on the fulcrum in real time.

[0017] The process involves: establishing a reference coordinate system, with each support point having known coordinates; the DSU (Digital Substrate Unit) monitoring the support force at each support point and transmitting the data to the data acquisition and processing system; the data acquisition and processing system then uses the torque balance principle to formulate equations and calculate the center of gravity coordinates of the upper module of the offshore platform; the coordinates of the pile legs on the jacket are known, and the center of gravity coordinates of the upper module of the offshore platform are known; using the torque balance principle, torque balance equations are formulated to calculate the weight of each pile leg and verify the load of the LMU (Low Mutual Unit); after the upper structure platform is constructed, before the upper module of the offshore platform is transferred to the barge, the connection between tension flange A and tension flange B or the connection between tension flange A and DSF flange is disconnected; finally, the DSF and the offshore platform are slid onto the barge via rails, transported to the offshore jacket by the barge, and the upper module of the offshore platform is transferred to the jacket using a floating method.

[0018] The advantages and positive effects of this invention are as follows:

[0019] 1. This invention uses a weighing system to replace the jack for weighing. The weighing DSU device combines the functions of a weighing jack and a traditional DSU, eliminating the work process of transferring the weighed platform modules to the DSF after construction and weighing, and reducing the construction process of weighing and calibrating the center of gravity of the platform, thus realizing intelligent calculation of the center of gravity position of the platform.

[0020] 2. This invention adds a weighing function to the traditional DSU and can be reused repeatedly, reducing overall costs and improving utilization.

[0021] 3. This invention improves construction efficiency, shortens the construction period, and saves manpower and material resources. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the weighing DSU device of the present invention in the locked state according to Embodiment 1;

[0023] Figure 2 This is a three-dimensional structural diagram of the weighing DSU device of the present invention in its natural state, according to Embodiment 1.

[0024] Figure 3 This is a cross-sectional view of the internal structure of the weighing DSU device of the present invention in the locked state according to Embodiment 1 of the present invention;

[0025] Figure 4 This is a cross-sectional view of the internal structure of the weighing DSU device of the present invention in its natural state, according to Embodiment 1.

[0026] Figure 5 This is a three-dimensional structural diagram of the weighing DSU device of the present invention, in embodiment two.

[0027] Figure 6This is a cross-sectional view of the internal structure of the weighing DSU device according to Embodiment 2 of the present invention;

[0028] Wherein: 1 is the tensioning outer cylinder, 2 is the elastomer cylinder, 3 is the guide seat, 4 is the adjusting plate, 5 is the DSU elastomer, 6 is the steel plate, 7 is the rubber, 8 is the guide block, 9 is the tensioning flange A, 10 is the tensioning flange B, 11 is the force measuring support, 12 is the connecting block A, 13 is the connecting flange, 14 is the weighing system, 15 is the bolt A, 16 is the bolt B, 17 is the connecting block B, and 18 is the DSF flange. Detailed Implementation

[0029] The invention will now be described in further detail with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figures 1-4 As shown, the weighing DSU device in this embodiment includes a weighing system 14 and an energy absorption system. The energy absorption system is the lower main body of the weighing DSU device, which has the functions of support and shock absorption. It supports the weight of the upper module of the offshore platform, works with the LMU to ensure the stability of the upper module during the transfer from the barge to the jacket, and absorbs the collision energy of the upper module to the barge and the jacket. The energy absorption system of this embodiment includes a tensioning outer cylinder 1, a DSU elastomer 5, a tensioning flange A9, and a tensioning flange B10. The tensioning outer cylinder 1 houses the expandable DSU elastomer 5. The outer surface of the tensioning outer cylinder 1 is provided with a tensioning flange A9. The tensioning flange B10 is linked to the DSU elastomer 5. The lower end of the weighing system 14 is connected to the tensioning flange B10. The upper module of the offshore platform is placed on the upper end of the weighing system 14. Before the upper module of the offshore platform is constructed, the tensioning flange B10 is connected to the tensioning flange A9, and the DSU elastomer 5 is in a compressed state. After the upper module of the offshore platform is constructed, before the upper module of the offshore platform is transferred to the barge, the tensioning flange B10 is disconnected from the tensioning flange A9. The tensioning flange B10 and the weighing system 14 can be displaced in the vertical direction through the extended DSU elastomer 5. The natural distance between the tensioning flange B10 and the upper end face of the tensioning outer cylinder 1 is the compression stroke of the weighing DSU device (this stroke needs to be determined according to the working conditions).

[0032] In this embodiment, the tensioning outer cylinder 1 is closed at the bottom and open at the top. An elastic body cylinder 2, capable of vertical displacement, is housed inside. The elastic body cylinder 2 is closed at the top and open at the bottom. A DSU elastic body 5 is housed within the elastic body cylinder 2. The elastic body cylinder 2 is displaced vertically relative to the tensioning outer cylinder 1 by the action of the DSU elastic body 5, and is guided by a guiding mechanism during this displacement. The guiding mechanism in this embodiment includes a guide seat 3 and a guide block 8. The guide seat 3 is located at the bottom of the elastic body cylinder 2 and rests on the tensioning outer cylinder 1. The edge of the upper panel of the guide seat 3 extends outward in the horizontal direction. The open end of the elastic body cylinder 2 is provided with a guide block 8 extending inward in the horizontal direction. The DSU elastic body 5 is placed on the guide seat 3, with both ends abutting against the guide seat 3 and the top of the elastic body cylinder 2, respectively. The elastic body cylinder 2 displaces vertically until the guide block 8 abuts against the extension of the upper panel of the guide seat 3.

[0033] The DSU elastomer 5 in this embodiment includes multiple rubbers 7 and multiple steel plates 6. The rubbers 7 and steel plates 6 are stacked alternately, and the top and bottom surfaces of each rubber 7 are fixed to the steel plates 6 by a vulcanization process. Adjacent steel plates 6 are welded together. The core component of the energy absorption system is the DSU elastomer 5. The combined structure of rubbers 7 and steel plates 6 can absorb energy during compression and release energy during rebound, while ensuring sufficient support rigidity. The number of layers of steel plates 6 and rubbers 7 is not limited and can be customized according to specific working conditions. An adjustment plate 4 is added between the bottom steel plate 6 of the DSU elastomer 5 and the upper panel of the guide seat 3. This plate can be used to adjust the overall assembly height and stroke of the DSU elastomer 5. The thickness of the adjustment plate 4 can be determined according to actual needs. When the working stroke is <100mm, a sand box can be used instead of the DSU elastomer 5 to accommodate smaller displacements.

[0034] The weighing system 14 in this embodiment is prior art and can be the "Bridge Health Monitoring Support" announced on July 3, 2018, with announcement number CN207567644U. The upper end of the weighing system 14 is a connecting flange 13, and multiple connecting blocks B17 are evenly arranged along the circumferential direction on the outer edge of the connecting flange 13; the lower end of the weighing system 14 is a force measuring support 11, and multiple connecting blocks A12 are arranged along the circumferential direction on the outer surface of the force measuring support 11. Each connecting block A12 is fixed to the tensioning flange B10 by bolts B16. The upper component of the offshore platform is bolted and fixed to the upper end of the weighing system 14 (i.e., the connecting flange 13), or the upper end surface of the connecting flange 13 is a high friction coefficient flange surface, and the upper component of the offshore platform is in contact with the high friction coefficient flange surface. The weighing system 14 is a system with the monitoring body as its core component and an automatic data acquisition module and a remote data transmission module as auxiliary equipment. Pressure sensors in the monitoring supports are connected to the controller via the automatic data acquisition module, and the controller is also connected to the remote data transmission module. The automatic data acquisition module processes the pressure sensor signals and sends them to the controller, while the remote data transmission module wirelessly transmits the detected pressure sensor data to terminals such as computers and mobile phones for remote monitoring. The weighing system 14 is equipped with an elastic layer, hydraulic circuits, and pressure sensors. Based on the elastic layer strain and hydraulic data feedback, the maximum allowable load and maximum flexural deformation of the weighing system 14 are determined according to the theoretical weight of the components and the allowable rotation angle, to adapt to different working conditions. Utilizing the principle of torque balance, the center of gravity position is confirmed, and the weight of each pile leg is calculated to ensure the accurate selection of the pile leg docking buffer device, thereby ensuring the stability of the offshore platform installation process; this is existing technology and will not be elaborated further.

[0035] The method of using the weighing DSU device in this embodiment is as follows:

[0036] Experimental Example 1

[0037] To ensure the stability of the superstructure construction process of the offshore platform, the energy absorption system in the weighing DSU unit must be locked before installation. By applying a vertical load, the tensioning flange B10 compresses the DSU elastomer 5 downwards. Under the action of the guide mechanism, the DSU elastomer 5 achieves vertical displacement (compression). After reaching the stroke limit, the tensioning flange A9 is connected to the tensioning flange B10 by bolt A15 to achieve locking, which is as follows. Figure 3 The locked state is shown. Multiple weighing DSU devices are set on the DSF as fulcrums. The weighing DSU devices are installed in the steel cylinders at the fulcrum positions and are initially in a locked state. The upper module of the offshore platform is directly built on the DSF. During the construction process, the weighing system 14 in the weighing DSU device of each fulcrum can monitor and transmit the force of that fulcrum in real time.

[0038] Experimental Example 2

[0039] A reference coordinate system is established, with each support point having known coordinates. The DSU (Distributed Weight Unit) monitoring device at each support point detects the supporting force value and transmits the data to the data acquisition and processing system (the data acquisition and processing system of this invention is prior art). The data acquisition and processing system uses the torque balance principle to derive equations, thereby calculating the coordinates of the center of gravity of the upper module of the offshore platform; this is prior art and will not be elaborated further. The coordinates of the legs on the jacket are known, and the coordinates of the center of gravity of the upper module of the offshore platform are also known. Using the torque balance principle, torque balance equations are derived, the weight of each leg is calculated, and the LMU (Lower Weight Unit) load is checked to ensure accurate selection of the leg ground contact buffer device, thus guaranteeing the balance of the offshore platform during installation. After the upper structure platform is erected, the center of gravity of the upper module of the offshore platform and the weight of each leg have been intelligently calculated. Before transferring the superstructure of the offshore platform to the barge, the bolts A15 between tension flanges A9 and B10 are loosened. Then, the DSF and the superstructure of the offshore platform are slid onto the barge via rails. The barge transports the superstructure to the center of the offshore jacket. After the upper and lower positions are aligned, the barge lowers its draft, and the superstructure of the offshore platform contacts the pre-installed LMU. The LMU begins to compress and absorb energy, and the weighing DSU gradually rebounds and releases energy, achieving a smooth load transfer and completing the installation of the superstructure onto the jacket. The process of sliding the DSF and the superstructure onto the barge via rails until installation on the jacket is completed is the same as existing technology and will not be described further here.

[0040] Example 2

[0041] like Figure 5 , Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the energy absorption system in this embodiment includes a tensioning outer cylinder 1, a DSU elastomer 5, a tensioning flange A9, and a DSF flange 18. The tensioning outer cylinder 1 is placed on the DSF flange 18, and the tensioning outer cylinder 1 contains a retractable DSU elastomer 5. The outer surface of the tensioning outer cylinder 1 is provided with a tensioning flange A9. The lower end of the weighing system 14 is connected to the tensioning outer cylinder 1, and the upper module of the offshore platform is placed on the upper end of the weighing system 14. Before the upper module of the offshore platform is constructed, the tensioning flange A9 is connected to the DSF flange 18 on the DSF, and the DSU elastomer 5 is in a compressed state. After the upper module of the offshore platform is constructed, before the upper module of the offshore platform is transferred to the barge, the tensioning flange A9 is disconnected from the DSF flange 18, and the tensioning outer cylinder 1 and the weighing system 14 can be vertically displaced through the extended DSU elastomer 5.

[0042] In this embodiment, the tensioning outer cylinder 1 is closed at the top and open at the bottom, and contains an elastic body cylinder 2 inside. The elastic body cylinder 2 is closed at the top and open at the bottom. The elastic body cylinder 2 is fixedly connected to the tensioning outer cylinder 1 or is an integral structure with the tensioning outer cylinder 1 (fixedly connected in this embodiment). The DSU elastic body 5 is housed inside the elastic body cylinder 2. The elastic body cylinder 2 and the tensioning outer cylinder 1 are displaced vertically relative to the DSF flange 18 by the action of the DSU elastic body 5, and are guided by a guide mechanism during the displacement. The guide mechanism in this embodiment includes a guide seat 3 and a guide block 8. The guide seat 3 is located at the bottom of the elastic body cylinder 2 and is placed on the DSF flange 18. The edge of the upper panel of the guide seat 3 extends outward in the horizontal direction, and the guide block 8 is provided inward in the horizontal direction at the open end of the elastic body cylinder 2. The DSU elastic body 5 is placed on the guide seat 3, and its two ends abut against the top of the guide seat 3 and the elastic body cylinder 2, respectively. The elastic body cylinder 2 and the tensioning outer cylinder 1 are displaced vertically until the guide block 8 abuts against the extension of the upper panel of the guide seat 3.

[0043] The weighing system 14 in this embodiment is the same as in embodiment one. Each connecting block A12 on the outer surface of the force measuring support 11 at the lower end of the weighing system 14 is fixed to the upper end face of the tensioning outer cylinder 1 by bolts 16. The upper part of the offshore platform is bolted to the upper end (i.e., the connecting flange 13) of the weighing system 14, or the upper end face of the connecting flange 13 is a high friction coefficient flange face, and the upper part of the offshore platform is in contact with the high friction coefficient flange face.

[0044] Everything else is the same as in Example 1.

[0045] The method of using the weighing DSU device in this embodiment is as follows:

[0046] Experimental Example 1

[0047] To ensure the stability of the superstructure construction process of the offshore platform, the energy absorption system in the weighing DSU unit must be locked before installation. By applying a vertical load, the tensioning outer cylinder 1 and the elastomer cylinder 2 compress the DSU elastomer 5 downwards. Under the action of the guide mechanism, the DSU elastomer 5 achieves vertical displacement (compression). After reaching the stroke limit, the tensioning flange A9 is connected to the DSF flange 18 by bolt A15 to achieve locking. Figure 6 The locking state is shown. Multiple weighing DSU devices are set on the DSF as fulcrums. The weighing DSU devices are bolted to the welded plates of the DSF corresponding to the fulcrum positions. Initially, they are in a locked state. The upper module of the offshore platform is directly built on the DSF. During the construction process, the weighing system 14 in the weighing DSU device of each fulcrum can monitor and transmit the force of the fulcrum in real time.

[0048] Experimental Example 2

[0049] A reference coordinate system is established, with each support point having known coordinates. The DSU (Distributed Weight Suspension Unit) monitoring device at each support point detects the supporting force value and transmits the data to the data acquisition and processing system (the data acquisition and processing system of this invention is prior art). The data acquisition and processing system uses the torque balance principle to derive equations, thereby calculating the coordinates of the center of gravity of the upper module of the offshore platform; this is prior art and will not be elaborated further. The coordinates of the legs on the jacket are known, and the coordinates of the center of gravity of the upper module of the offshore platform are also known. Using the torque balance principle, torque balance equations are derived to calculate the weight of each leg, ensuring accurate selection of the leg ground contact buffer device, thus guaranteeing the balance of the offshore platform during installation. After the upper structure platform is constructed, the center of gravity of the upper module of the offshore platform and the weight of each leg have been intelligently calculated. Before transferring the superstructure of the offshore platform to the barge, the bolts A15 between tension flange A9 and DSF flange 18 are loosened. Then, the DSF and the superstructure of the offshore platform are slid onto the barge via rails. The barge transports the superstructure of the offshore platform to the center of the offshore jacket. After the upper and lower positions are aligned, the barge lowers its draft, and the superstructure of the offshore platform contacts the pre-installed LMU. The LMU begins to compress and absorb energy, and the weighing DSU gradually rebounds and releases energy, achieving a smooth transfer of load and completing the installation of the superstructure of the offshore platform onto the jacket. The process of sliding the DSF and the superstructure of the offshore platform onto the barge via rails until the installation on the jacket is completed is the same as in existing technology and will not be described further here.

[0050] This invention utilizes a weighing system 14 to replace jacks for weighing. The weighing DSU device combines the functions of a weighing jack and a traditional DSU, eliminating the need for transferring the weighed platform modules to the DSF after construction. It can adapt to the pivot angle generated by dynamic loads during offshore platform construction, achieving decoupling. It can achieve non-fixed or bolted connections with the upper modules of the offshore platform, eliminating the need for welding, saving time and labor, standardizing weighing, and enabling repeated use. The weighing DSU device of this invention can withstand a larger surface pressure (approximately 45 MPa, compared to a maximum of 28 MPa for jacks). For modules of the same tonnage, the support surface design size is much smaller than that of jacks, optimizing the spatial design of module support. The weighing DSU device of this invention adds and improves the functions of a traditional DSU, simplifying the construction and weighing process before float-over installation, making weighing more intelligent and accurate, improving construction efficiency, shortening the construction period, and reducing overall construction costs.

Claims

1. A weighing DSU device for floating installation on large offshore platforms, installed inside a cylinder on a DSF, characterized in that: The system includes a weighing system (14) and an energy absorption system. The energy absorption system includes a tensioning outer cylinder (1), a DSU elastomer (5), a tensioning flange A (9), and a tensioning flange B (10). The tensioning outer cylinder (1) contains a retractable DSU elastomer (5). The outer surface of the tensioning outer cylinder (1) is provided with a tensioning flange A (9). The tensioning flange B (10) is linked to the DSU elastomer (5). The lower end of the weighing system (14) is connected to the tensioning flange B (10). The upper module is placed at the top of the weighing system (14); the tensioning flange B (10) is connected to the tensioning flange A (9) before the upper module of the offshore platform is constructed, and the DSU elastomer (5) is in a compressed state; the tensioning flange B (10) is disconnected from the tensioning flange A (9) after the upper module of the offshore platform is constructed and before it is transferred to the barge, and the tensioning flange B (10) and the weighing system (14) can be displaced in the vertical direction through the extended DSU elastomer (5); The tensioning outer cylinder (1) is closed at the bottom and open at the top. It contains an elastic body cylinder (2) that can be displaced relative to the tensioning outer cylinder (1) in the vertical direction. The DSU elastic body (5) is housed in the elastic body cylinder (2). The elastic body cylinder (2) is displaced relative to the tensioning outer cylinder (1) in the vertical direction by the action of the DSU elastic body (5), and is guided by a guide mechanism during the displacement process. The guiding mechanism includes a guide seat (3) and a guide block (8). The top of the elastic body cylinder (2) is closed and the bottom is open. The guide seat (3) is located at the bottom of the elastic body cylinder (2) and is placed on the tension outer cylinder (1). The edge of the upper panel of the guide seat (3) extends outward in the horizontal direction. The open end of the elastic body cylinder (2) is provided with a guide block (8) in the horizontal direction. The DSU elastomer (5) is placed on the guide seat (3) and its two ends abut against the top of the guide seat (3) and the elastic body cylinder (2) respectively. The elastic body cylinder (2) moves in the vertical direction until the guide block (8) abuts against the extension of the upper panel of the guide seat (3).

2. The weighing DSU device for floating installation on large offshore platforms according to claim 1, characterized in that: The upper module of the offshore platform is bolted to the upper end of the weighing system (14), or the upper end face of the weighing system (14) is a high friction coefficient flange face, and the upper module of the offshore platform is in contact with the high friction coefficient flange face.

3. The weighing DSU device for floating installation on large offshore platforms according to claim 1, characterized in that: An adjustment plate (4) is provided between the DSU elastomer (5) and the upper panel of the guide seat (3).

4. The weighing DSU device for floating installation on large offshore platforms according to claim 1, characterized in that: The DSU elastomer (5) includes multiple rubbers (7) and multiple steel plates (6), the rubbers (7) and steel plates (6) are stacked alternately, and each rubber (7) has a steel plate (6) fixedly attached to its upper and lower surfaces, and adjacent steel plates (6) are fixedly attached to each other.

5. A weighing DSU device for floating installation on large offshore platforms, installed inside a cylinder on a DSF, characterized in that: The system includes a weighing system (14) and an energy absorption system. The energy absorption system includes a tensioning outer cylinder (1), a DSU elastomer (5), a tensioning flange A (9), and a DSF flange (18). The tensioning outer cylinder (1) is placed on the DSF flange (18). The tensioning outer cylinder (1) contains a retractable DSU elastomer (5). The outer surface of the tensioning outer cylinder (1) is provided with a tensioning flange A (9). The lower end of the weighing system (14) is connected to the tensioning outer cylinder (1). The upper module is placed at the top of the weighing system (14); the tensioning flange A (9) is connected to the DSF flange (18) on the DSF before the upper module of the offshore platform is constructed, and the DSU elastomer (5) is in a compressed state; the tensioning flange A (9) is disconnected from the DSF flange (18) after the upper module of the offshore platform is constructed and before it is transferred to the barge, and the tensioning outer cylinder (1) and the weighing system (14) can be vertically displaced through the extended DSU elastomer (5); The tensioning outer cylinder (1) is closed at the top and open at the bottom, and has an elastic body cylinder (2) inside. The elastic body cylinder (2) is fixed to the tensioning outer cylinder (1) or is an integral structure with the tensioning outer cylinder (1). The DSU elastic body (5) is housed in the elastic body cylinder (2). The elastic body cylinder (2) and the tensioning outer cylinder (1) are displaced in the vertical direction relative to the DSF flange (18) by the action of the DSU elastic body (5), and are guided by the guide mechanism during the displacement process. The guiding mechanism includes a guide seat (3) and a guide block (8). The top of the elastic body cylinder (2) is closed and the bottom is open. The guide seat (3) is located at the bottom of the elastic body cylinder (2) and is placed on the DSF flange (18). The edge of the upper panel of the guide seat (3) extends outward in the horizontal direction. The open end of the elastic body cylinder (2) is provided with a guide block (8) in the horizontal direction. The DSU elastomer (5) is placed on the guide seat (3) and its two ends abut against the top of the guide seat (3) and the elastic body cylinder (2) respectively. The elastic body cylinder (2) and the tensioning outer cylinder (1) are displaced in the vertical direction until the guide block (8) abuts against the extension of the upper panel of the guide seat (3).

6. The weighing DSU device for floating installation on large offshore platforms according to claim 5, characterized in that: An adjustment plate (4) is provided between the DSU elastomer (5) and the upper panel of the guide seat (3).

7. The weighing DSU device for floating installation on large offshore platforms according to claim 5, characterized in that: The DSU elastomer (5) includes multiple rubbers (7) and multiple steel plates (6), the rubbers (7) and steel plates (6) are stacked alternately, and each rubber (7) has a steel plate (6) fixedly attached to its upper and lower surfaces, and adjacent steel plates (6) are fixedly attached to each other.

8. A method of using the weighing DSU device for floating installation on large offshore platforms as described in claim 1 or 5, characterized in that: To ensure the stability of the construction process of the upper module of the offshore platform, a vertical load is applied to the weighing DSU device before it is installed on the DSF, so that the DSU elastomer (5) is in a compressed state. The energy absorption system is locked by connecting the tensioning flange A (9) and the tensioning flange B (10) or by connecting the tensioning flange A (9) and the DSF flange (18). Then, multiple weighing DSU devices are set on the DSF as fulcrums. The weighing DSU devices are installed in the cylinder at the fulcrum position or the weighing DSU devices are bolted to the welding plate of the DSF corresponding to the fulcrum position. The upper module of the offshore platform is built on the DSF. During the construction process, the weighing system (14) in the weighing DSU device at each fulcrum can monitor and transmit the force of the fulcrum in real time.

9. The method of use according to claim 8, characterized in that: A reference coordinate system is set, and each support point is a known coordinate point. The weighing DSU device at each support point monitors the support force value of each support point and transmits the data to the data acquisition and processing system. The data acquisition and processing system will list the equation according to the torque balance principle to calculate the center of gravity coordinate of the upper block of the offshore platform. The coordinate point of the pile leg on the jacket is known, and the center of gravity coordinate of the upper block of the offshore platform is known. Using the torque balance principle, the torque balance equation is listed, the weight of each pile leg is calculated, and the load of the LMU is checked. After the upper structure platform is completed, before the upper block of the offshore platform is transferred to the barge, the connection between the tensioning flange A (9) and the tensioning flange B (10) or the connection between the tensioning flange A (9) and the DSF flange (18) is disconnected. Finally, the DSF and the offshore platform are slid to the barge through the track and transported to the offshore jacket by the barge. The upper block of the offshore platform is transferred to the jacket by the floating method.

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