Overall lifting method of offshore photovoltaic platform

Abstract

The invention discloses an integral lifting method for an offshore photovoltaic platform. An integral lifting device comprising an upper lifting frame, two upper steel wire ropes, a lower lifting frame and four lower steel wire ropes is adopted. The upper hanging bracket is a rectangular frame; the two upper steel wire ropes are connected between the top surfaces of the four corners of the upper hanging bracket and a main hook of the crane ship; the lower lifting frame comprises two lifting beams and two groups of buoys; the two lifting beams are respectively positioned below the two upper cross beams of the upper lifting frame; the inner side faces of the two ends of each lifting beam are each provided with a concave through groove, the opening end of each concave through groove is hinged to a side door, and a square inserting hole is defined by the concave through grooves and the side doors. The two groups of buoys are respectively bound on the top surfaces of the two lifting beams; four fulcrum seats of the photovoltaic platform are inserted into four insertion holes of the lower lifting frame; the four lower steel wire ropes are connected between the four corners of the upper hanging bracket and the two ends of the two lifting beams. The installation efficiency of the photovoltaic platform can be effectively improved, and the offshore operation time is greatly shortened.

Description

Technical Field

[0001] The invention relates to an integral lifting method for an offshore photovoltaic platform. Background Art

[0002] Offshore photovoltaics is a new way to utilize marine energy. Offshore photovoltaics is to build solar photovoltaic power generation systems in marine environments such as offshore and mudflats. With its advantages of rich resources and high efficiency, it has become a new favorite in the field of solar energy utilization. The current offshore photovoltaic structures are floating and pile-fixed. The photovoltaic platform unit of the pile-fixed structure includes a photovoltaic platform and four piles driven at sea. The photovoltaic platform is a truss structure and includes a photovoltaic platform body and four legs connected to the bottom of the photovoltaic platform body. A fulcrum seat is provided at the bottom of each leg, and photovoltaic panels are installed on the top surface of the photovoltaic platform body. The height of the first two legs of the four legs is greater than that of the last two legs. A connecting seat is provided on the top of each of the four pile foundations for docking with the four fulcrum seats of the photovoltaic platform one by one, so that the photovoltaic platform body is tilted 15° in a way that the front is high and the back is low. The existing hoisting method of the photovoltaic platform is to reserve four hoisting holes corresponding to the four fulcrum seats on the main body of the photovoltaic platform (without installing photovoltaic panels), and to use the four lifting ears on the rectangular hanger to extend four steel wire ropes from the four hoisting holes one by one to connect with the four fulcrum seats and then lift them. After the four fulcrum seats of the photovoltaic platform are connected to the four pile foundations, the photovoltaic panels at the four hoisting holes are installed at sea, which not only increases the time of offshore operations, but also poses huge risks to human work at high altitudes in the marine environment. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an overall lifting method for an offshore photovoltaic platform, which can effectively improve the installation efficiency of the photovoltaic platform, greatly reduce the offshore operation time, and has higher safety.

[0004] A technical solution to achieve the purpose of the present invention is: a method for hoisting an offshore photovoltaic platform as a whole, which is used to hoist the photovoltaic platform to four pile foundations with rectangular axis lines set on the sea; the photovoltaic platform includes a photovoltaic platform body, four legs connected to the bottom of the photovoltaic platform body, and four fulcrum seats connected to the bottom of the four legs in a one-to-one correspondence and connected to the top connection seats of the four pile foundations in a one-to-one correspondence;

[0005] The overall lifting method adopts an overall lifting device of an offshore photovoltaic platform, which includes an upper hanging frame, two upper steel wire ropes, a lower lifting frame and four lower steel wire ropes; wherein,

[0006] The upper hanger comprises two upper cross beams and two upper longitudinal beams, the length of the upper cross beams is greater than the width of the photovoltaic platform body, and the spacing between the two upper cross beams is adapted to the lateral spacing of the fulcrum seats of the photovoltaic platform; an upper hanging ear is fixed on each of the top surfaces at both ends of the two upper cross beams; the two upper longitudinal beams are connected one by one between the inner side surfaces at both ends of the two upper cross beams, and form a rectangular frame with the two upper cross beams;

[0007] The two ends of one upper steel wire rope are connected to the two upper lifting ears of an upper cross beam of the upper hanger in a one-to-one correspondence, and the two ends of another upper steel wire rope are connected to the two upper lifting ears of another upper cross beam of the upper hanger in a one-to-one correspondence, and the middle parts of the two upper steel wire ropes are hung on the main hook of the crane ship;

[0008] The lower lifting frame includes two lifting beams and two groups of buoys; the two lifting beams are located one-to-one under the two upper beams of the upper hanging frame, and the length of the lifting beams is adapted to the length of the upper beams; a lower lifting ear corresponding to the two upper lifting ears on the corresponding upper beams is fixed on the top surface at both ends of each lifting beam; the cross section of each lifting beam is a rectangular frame, and a concave through groove is provided on the inner side surfaces at both ends of each lifting beam, and a side door is hinged at the open end of each concave through groove, so that the concave through groove and the side door form a square socket; the outer side surface of each side door is connected to a hydraulic cylinder; the axial center spacing of the two sockets is adapted to the longitudinal spacing of the fulcrum seats on the photovoltaic platform;

[0009] Two groups of buoys are tied one by one to the top surfaces of two lifting beams;

[0010] The four supporting seats of the photovoltaic platform are inserted into the four sockets of the lower lifting frame one by one;

[0011] Four lower steel wire ropes are connected one by one between four upper lifting ears of the upper hanging frame and four lower lifting ears of the lower lifting frame;

[0012] The overall lifting method of the offshore photovoltaic platform comprises the following steps:

[0013] Step 1: Use the lower lifting frame as the transport tooling for the photovoltaic platform, first close the side doors of the four sockets on the lower lifting frame through the corresponding hydraulic cylinders, lock each side door to the corresponding socket, and then install the lower lifting frame on the main deck of the transport barge;

[0014] Step 2: After the photovoltaic platform is processed and assembled on land, four pairs of lifting holes are evenly reserved on the main body of the photovoltaic platform; the photovoltaic platform is hoisted onto the transport barge after being connected to the four pairs of lifting holes by a land-based hanger, and the four fulcrum seats of the photovoltaic platform are correspondingly inserted into the four sockets of the lower lifting frame one by one;

[0015] Step 3: On the transport barge, first install the photovoltaic panels in the four pairs of lifting holes on the main body of the photovoltaic platform, and connect the corresponding electrical lines, and then transport the photovoltaic platform and the lower stand to the machine position at the project site by the transport barge;

[0016] Step 4: At the machine position on site, the main hook on the crane ship is connected to the upper hanger through two upper steel wire ropes, and the upper hanger is connected to the lower hanger through four lower steel wire ropes. Then the photovoltaic platform and the lower lifting frame are lifted from the transport barge together, and the photovoltaic platform is installed on the four pile foundations. The top connecting seats of the four pile foundations are passed through the four sockets of the lower lifting frame one by one, and the four supporting seats of the photovoltaic platform are connected to the top connecting seats of the four pile foundations one by one, completing the installation of a photovoltaic platform unit;

[0017] Step 5: First, unhook the four lower lifting ears of the lower lifting frame from the four lower steel wire ropes one by one, then use the water pumps in the two groups of buoys on the lower lifting frame to adjust the buoyancy of the two lifting beams so that the two lifting beams are lower than the fulcrum seat of the photovoltaic platform, and then use the four hydraulic cylinders to open the side doors of the four sockets one by one, and then drag the two lifting beams out to the open waters in the direction away from the corresponding side doors, and finally lift the two lifting beams to the transport barge;

[0018] Step six: The crane ship and transport barge will return the entire lifting device to the processing site to prepare for the installation of the next photovoltaic platform.

[0019] The above-mentioned overall lifting method of the offshore photovoltaic platform, wherein, when performing step five, first unhook the two lower lifting ears on one lifting beam from the corresponding two lower steel wire ropes, adjust the buoyancy of the other lifting beam to be lower than the fulcrum seat of the photovoltaic platform through the float, then open the side doors of the two sockets on the lifting beam, and then drag the lifting beam out in the direction away from the side doors; then drop the upper hanger and the dragged lifting beam onto the transport barge, then open the side doors of the two sockets on the other lifting beam, and then drag the lifting beam out in the direction away from the side door, and finally lift it back to the transport barge by the crane ship.

[0020] The above-mentioned overall lifting method for the offshore photovoltaic platform, wherein the lifting beam is a square tube truss and includes two upper main beams, two lower main beams, a plurality of upper horizontal connecting rods spaced apart between the two upper main beams, a plurality of lower horizontal connecting rods spaced apart between the two lower main beams, and a plurality of vertical connecting rods spaced apart between the two upper main beams and the corresponding lower main beams; the top surface of each concave through groove on each lifting beam is composed of two upper horizontal connecting rods and an upper main beam, and the bottom surface of each concave through groove is composed of two lower horizontal connecting rods and a lower main beam; the side door hinged to each concave through groove is a rectangular frame.

[0021] The above-mentioned overall lifting method for an offshore photovoltaic platform, wherein one end of the side door is hinged to the inner side surface of the lifting beam through a rotating shaft, a latch hole is installed on the top surface of the side door, and the latch hole is plugged with a latch installed on the lifting beam, so that the side door is locked with the corresponding socket through the latch;

[0022] In the above-mentioned overall lifting method for the offshore photovoltaic platform, an arc-shaped limit block is fixed on each of the four surrounding surfaces of the socket, and the centers of the inner arc surfaces of the four limit blocks are located on the axis of the socket.

[0023] In the above-mentioned overall lifting method for the offshore photovoltaic platform, two groups of buoys are respectively provided with a water pump for controlling the buoyancy of the buoys.

[0024] The overall lifting method of the offshore photovoltaic platform of the present invention has the following characteristics:

[0025] The integrated lifting device adopted by the present invention mainly comprises a rectangular upper hanger, a lower lift frame composed of two lifting beams, four lower steel wire ropes connected between the upper hanger and the lower lift frame, and two upper steel wire ropes connected between the upper hanger and the main hook of the crane ship; the present invention respectively opens two plug holes on the two lifting beams, and sets a side door on the side of each plug hole, and inserts the four supporting seats at the bottom of the photovoltaic platform into the four plug holes one by one; the present invention ties a buoy with adjustable buoyancy on the two lifting beams. When the lower lifting frame is installed on the transport barge, it can be used as a transport tool for the photovoltaic platform; when the lower lifting frame is connected to the upper hanging frame through four lower steel wire ropes, and the upper hanging frame is connected to the main hook of the crane ship through two upper steel wire ropes, the photovoltaic platform can be quickly and conveniently lifted to the sea and installed on four pile foundations, and then the side door of the socket is opened, and the buoyancy of the lifting beam is adjusted by the float, so that the lower lifting frame is separated from the photovoltaic platform and is towed out and floated to the transport barge. The overall lifting method of the present invention can effectively improve the installation efficiency of the photovoltaic platform, and there is no need to reserve installation holes on the main body of the photovoltaic platform, which greatly reduces the offshore operation time and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a side view of the overall lifting device for an offshore photovoltaic platform of the present invention;

[0027] Figure 2 is a top view of the overall lifting device for an offshore photovoltaic platform of the present invention;

[0028] Figure 3a This is a side view of the lifting beam in the overall lifting device of the offshore photovoltaic platform of the present invention.

[0029] Figure 3b It is a top view of a lifting beam in the integral lifting device for an offshore photovoltaic platform of the present invention;

[0030] Figure 3c yes Figure 3b Enlarged view of the middle P site;

[0031] Figure 4 is a side view of the step 1 of the overall lifting method of the offshore photovoltaic platform of the present invention;

[0032] Figure 5 is a top view of the step 2 of the overall lifting method for an offshore photovoltaic platform of the present invention;

[0033] Figure 6 is a side view of the process of performing step 3 of the overall lifting method of the offshore photovoltaic platform of the present invention;

[0034] Figure 7 is a side view of the step 5 of the overall lifting method of the offshore photovoltaic platform of the present invention

[0035] Figure 8 is a side view of the step 5 of the overall lifting method for an offshore photovoltaic platform of the present invention;

[0036] Fig. 9 is a side view of the step 5 of the overall lifting method for an offshore photovoltaic platform of the present invention;

[0037] Fig.10 It is a side view of the step six of the overall lifting method of the offshore photovoltaic platform of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] See also Figures 1 to 3c The overall lifting method of the offshore photovoltaic platform of the present invention is used to lift the photovoltaic platform to four pile foundations 100 with rectangular axis lines set on the sea; the photovoltaic platform 1 includes a photovoltaic platform body 10, four legs 11 connected to the bottom of the photovoltaic platform body 10, and four fulcrum seats 12 connected to the bottom of the four legs 11 one by one and connected to the top connection seats of the four pile foundations 100 one by one.

[0040] The overall lifting method of the offshore photovoltaic platform of the present invention adopts an overall lifting device of the offshore photovoltaic platform, which includes an upper hanging frame 2, two upper steel wire ropes 3, a lower lifting frame 4 and four lower steel wire ropes 5.

[0041] The upper hanger 2 includes two upper cross beams 21 and two upper longitudinal beams 22, wherein the length of the upper cross beam 21 is greater than the width of the photovoltaic platform body 10, and the spacing between the two upper cross beams 22 is adapted to the lateral spacing of the fulcrum seats 12 of the photovoltaic platform 1; an upper lifting ear 23 is fixed on each of the top surfaces at both ends of the two upper cross beams 21; the two upper longitudinal beams 22 are connected one by one between the inner side surfaces at both ends of the two upper cross beams 21, so that the two upper longitudinal beams 22 and the two upper cross beams 21 form a rectangular frame.

[0042] The two ends of an upper steel wire rope 3 are connected one by one to the two upper lifting ears 23 of an upper cross beam 21 of the upper hanger 2, and the two ends of another upper steel wire rope 3 are connected one by one to the two upper lifting ears 23 of another upper cross beam 21 of the upper hanger 2, and the middle parts of the two upper steel wire ropes 3 are hung on the main hook of the crane vessel 400.

[0043] The lower lifting frame 4 includes two lifting beams 41 and two groups of buoys 44; the two lifting beams 41 are located one-to-one below the two upper beams 21 of the upper hanger 2, and the length of the lifting beams 41 is adapted to the length of the upper beams 21; a lower lifting ear 42 corresponding to the two upper lifting ears 23 on the corresponding upper beams 21 is fixed on the top surface of each end of each lifting beam 41; the cross section of each lifting beam 41 is a rectangular frame, and a concave through groove is provided on the inner side surfaces of the two ends of each lifting beam 41, and a side door 43 is hinged at the open end of each concave through groove, so that the concave through groove and the side door 43 form a square socket 40, and the outer side of each side door 43 is connected to a hydraulic cylinder 430, which is connected to the hydraulic cylinder 430. The cylinder seat is installed on the inner side of the lifting beam 41, so that the side door 43 can be controlled to switch by the hydraulic cylinder 430; an arc-shaped limit block 400 is fixed on each of the four sides of the socket 40, and the center of the inner arc surface of the four limit blocks 400 is located on the axis of the socket 40, which can well guide the insertion of the pile foundation 100; the center distance between the two sockets 40 is adapted to the longitudinal distance of the fulcrum seat 12 of the photovoltaic platform; one end of the side door 43 is hinged on the inner side of the lifting beam 41 through a rotating shaft 431, and a pin hole 432 is installed on the top surface of the other end of the side door 43, and the pin hole 432 is connected with the pin 433 installed on the top surface of the lifting beam 41, so that the side door 43 closes the corresponding socket 40 through the pin 433.

[0044] The lifting beam 41 adopts a square tube truss and includes two upper main beams 411, two lower main beams 412, a plurality of upper horizontal connecting rods 413 spaced apart between the two upper main beams 411, a plurality of lower horizontal connecting rods 414 spaced apart between the two lower main beams 412, and a plurality of vertical connecting rods 415 spaced apart between the two upper main beams 411 and the corresponding lower main beams 412; the top surface of each concave through groove on each lifting beam 41 is composed of two upper horizontal connecting rods 413 and an upper main beam 411, and the bottom surface of each concave through groove is composed of two lower horizontal connecting rods 414 and a lower main beam 412; the side door 43 hinged to each concave through groove is a rectangular frame.

[0045] The two groups of buoys 44 are tied to the top surfaces of the two lifting beams 41 in a one-to-one correspondence, and the two groups of buoys 44 are respectively equipped with a water pump for controlling the buoyancy of the buoys.

[0046] The four supporting seats 12 of the photovoltaic platform 1 are inserted into the four insertion holes 40 of the lower lifting frame 4 in a one-to-one correspondence;

[0047] The four lower steel wire ropes 5 are connected between the four upper lifting ears 23 of the upper hanger 2 and the four lower lifting ears 42 of the lower lifting frame 4 in a one-to-one correspondence.

[0048] Please see again Figures 4 to 10 The overall lifting method of the offshore photovoltaic platform of the present invention comprises the following steps:

[0049] Step 1: Use the lower lifting frame 4 as the transport tooling for the photovoltaic platform 1. First, close the side doors 43 of the four sockets 40 on the lower lifting frame 4 through the corresponding hydraulic cylinders 430, and lock the side doors 43 to the corresponding sockets 40 through the latches 433. Then, install the lower lifting frame 4 on the main deck of the transport barge 300 (see FIG. Figure 4 );

[0050] Step 2: After the photovoltaic platform 1 is processed and assembled on land, four pairs of lifting holes 1A are evenly reserved on the photovoltaic platform body 10; the land-based hanger 200 is connected to the four pairs of lifting holes 1A and then hoisted to the transport barge 300, and the four fulcrum seats 12 of the photovoltaic platform 1 are correspondingly inserted into the four sockets 40 of the lower lifting frame 4 (see FIG. Figure 5 );

[0051] Step 3: On the transport barge 300, first install the photovoltaic panels in the four pairs of lifting holes 1A on the photovoltaic platform body 10 (see Figure 6 ), and connect the corresponding electrical lines, and then transport the photovoltaic platform and the lower stand 4 to the machine position at the project site by means of a transport barge 300;

[0052] Step 4: At the site, the main hook on the crane vessel 400 is connected to the upper hanger 2 through two upper wire ropes 3, and the upper hanger 2 is connected to the lower hanger 4 through four lower wire ropes 5 (see FIG. Figure 7 ), then lift the photovoltaic platform and the lower lifting frame 4 from the transport barge 300, and install the photovoltaic platform 1 on the four pile foundations 100 (see Figure 8 ), let the top connection seats of the four pile foundations 100 pass through the four sockets 40 of the lower lifting frame 4 one by one, so that the four supporting seats 12 of the photovoltaic platform 1 are connected to the connection seats of the four pile foundations 100 one by one, and complete the installation of a photovoltaic platform unit (see Fig. 9 );

[0053] Step 5: first, unhook the four lower lifting ears 42 of the lower lifting frame 4 from the four lower steel wire ropes 5 one by one, and then use the water pumps in the two groups of buoys 44 on the lower lifting frame 4 to adjust the buoyancy of the two lifting beams 41 so that the two lifting beams 41 are lower than the fulcrum seat 12 of the photovoltaic platform 1 (see Fig.10 ), open the latch 433 on each side door 43, and then use four hydraulic cylinders 430 to open the side doors 43 of the four sockets 40 one by one, and then drag the two lifting beams 41 out to the open water in the direction opposite to the corresponding side door 43, and finally lift the two lifting beams 41 onto the transport barge 300;

[0054] Alternatively, firstly, the two lower lifting ears 42 on one lifting beam 41 are unhooked from the corresponding two lower steel wire ropes 5, and the buoyancy of the other lifting beam 41 is adjusted to be lower than the fulcrum seat 12 of the photovoltaic platform through the float 44, and then the side doors 43 of the two sockets 40 on the lifting beam 41 are opened, and then the lifting beam 41 is dragged out in the direction away from the side doors 43; then the upper hanger 2 and the dragged lifting beam 41 are dropped onto the transport barge 300, and then the side doors 43 of the two sockets 40 on the other lifting beam 41 are opened, and then the lifting beam 41 is dragged out in the direction away from the side door 43, and finally lifted back to the transport barge 300 by the crane ship 400.

[0055] Step six: The crane vessel 400 and the transport barge 300 return the entire lifting device to the processing site to prepare for the installation of the next photovoltaic platform.

[0056] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A method for hoisting an offshore photovoltaic platform as a whole, for hoisting the photovoltaic platform to four pile foundations with rectangular axis lines set on the sea; the photovoltaic platform comprises a photovoltaic platform body, four legs connected to the bottom of the photovoltaic platform body, and four fulcrum seats connected to the bottom of the four legs in a one-to-one correspondence and connected to the top connection seats of the four pile foundations in a one-to-one correspondence; The overall lifting method adopts an overall lifting device of an offshore photovoltaic platform, which includes an upper hanging frame, two upper steel wire ropes, a lower lifting frame and four lower steel wire ropes; it is characterized in that: The upper hanger comprises two upper cross beams and two upper longitudinal beams, the length of the upper cross beams is greater than the width of the photovoltaic platform body, and the spacing between the two upper cross beams is adapted to the lateral spacing of the fulcrum seats of the photovoltaic platform; an upper hanging ear is fixed on each of the top surfaces at both ends of the two upper cross beams; the two upper longitudinal beams are connected one by one between the inner side surfaces at both ends of the two upper cross beams, and form a rectangular frame with the two upper cross beams; The two ends of one upper steel wire rope are connected to the two upper lifting ears of an upper cross beam of the upper hanger in a one-to-one correspondence, and the two ends of another upper steel wire rope are connected to the two upper lifting ears of another upper cross beam of the upper hanger in a one-to-one correspondence, and the middle parts of the two upper steel wire ropes are hung on the main hook of the crane ship; The lower lifting frame includes two lifting beams and two groups of buoys; the two lifting beams are located one-to-one under the two upper beams of the upper hanging frame, and the length of the lifting beams is adapted to the length of the upper beams; a lower lifting ear corresponding to the two upper lifting ears on the corresponding upper beams is fixed on the top surface at both ends of each lifting beam; the cross section of each lifting beam is a rectangular frame, and a concave through groove is provided on the inner side surfaces at both ends of each lifting beam, and a side door is hinged at the open end of each concave through groove, so that the concave through groove and the side door form a square socket; the outer side surface of each side door is connected to a hydraulic cylinder; the axial center spacing of the two sockets is adapted to the longitudinal spacing of the fulcrum seats on the photovoltaic platform; Two groups of buoys are tied one by one to the top surfaces of two lifting beams; The four supporting seats of the photovoltaic platform are inserted into the four sockets of the lower lifting frame one by one; Four lower steel wire ropes are connected one by one between four upper lifting ears of the upper hanging frame and four lower lifting ears of the lower lifting frame; The overall lifting method of the offshore photovoltaic platform comprises the following steps: Step 1: Use the lower lifting frame as the transport tooling for the photovoltaic platform, first close the side doors of the four sockets on the lower lifting frame through the corresponding hydraulic cylinders, lock each side door to the corresponding socket, and then install the lower lifting frame on the main deck of the transport barge; Step 2: After the photovoltaic platform is processed and assembled on land, four pairs of lifting holes are evenly reserved on the main body of the photovoltaic platform; the photovoltaic platform is hoisted onto the transport barge after being connected to the four pairs of lifting holes by a land-based hanger, and the four fulcrum seats of the photovoltaic platform are correspondingly inserted into the four sockets of the lower lifting frame one by one; Step 3: On the transport barge, first install the photovoltaic panels in the four pairs of lifting holes on the main body of the photovoltaic platform, and connect the corresponding electrical lines, and then transport the photovoltaic platform and the lower stand to the machine position at the project site by the transport barge; Step 4: At the machine position on site, the main hook on the crane ship is connected to the upper hanger through two upper steel wire ropes, and the upper hanger is connected to the lower hanger through four lower steel wire ropes. Then the photovoltaic platform and the lower lifting frame are lifted from the transport barge together, and the photovoltaic platform is installed on the four pile foundations. The top connecting seats of the four pile foundations are passed through the four sockets of the lower lifting frame one by one, and the four supporting seats of the photovoltaic platform are connected to the top connecting seats of the four pile foundations one by one, completing the installation of a photovoltaic platform unit; Step 5: First, unhook the four lower lifting ears of the lower lifting frame from the four lower steel wire ropes one by one, then use the water pumps in the two groups of buoys on the lower lifting frame to adjust the buoyancy of the two lifting beams so that the two lifting beams are lower than the fulcrum seat of the photovoltaic platform, and then use the four hydraulic cylinders to open the side doors of the four sockets one by one, and then drag the two lifting beams out to the open waters in the direction away from the corresponding side doors, and finally lift the two lifting beams to the transport barge; Step six: The crane ship and transport barge will return the entire lifting device to the processing site to prepare for the installation of the next photovoltaic platform.

2. The overall hoisting method of an offshore photovoltaic platform according to claim 1, characterized in that: When performing step five, first unhook the two lower lifting ears on one lifting beam from the corresponding two lower steel wire ropes, adjust the buoyancy of the other lifting beam to be lower than the fulcrum seat of the photovoltaic platform through the float, then open the side doors of the two sockets on the lifting beam, and then drag the lifting beam out in the direction away from the side doors; then drop the upper hanger and the dragged lifting beam onto the transport barge, then open the side doors of the two sockets on the other lifting beam, and then drag the lifting beam out in the direction away from the side door, and finally lift it back to the transport barge by the crane ship.

3. The overall lifting method of an offshore photovoltaic platform according to claim 1 or 2, characterized in that: The lifting beam is a square tube truss and includes two upper main beams, two lower main beams, a plurality of upper horizontal connecting rods spaced apart between the two upper main beams, a plurality of lower horizontal connecting rods spaced apart between the two lower main beams, and a plurality of vertical connecting rods spaced apart between the two upper main beams and the corresponding lower main beams; the top surface of each concave through slot on each lifting beam is composed of two upper horizontal connecting rods and an upper main beam, and the bottom surface of each concave through slot is composed of two lower horizontal connecting rods and a lower main beam; the side door hinged to each concave through slot is a rectangular frame.

4. The overall lifting method of an offshore photovoltaic platform according to claim 1 or 2, characterized in that: One end of the side door is hinged on the inner side of the lifting beam through a rotating shaft, and a latch hole is installed on the top surface of the side door. The latch hole is plugged into a latch installed on the lifting beam, so that the side door locks the corresponding socket through the latch.

5. The overall lifting method of an offshore photovoltaic platform according to claim 1 or 2, characterized in that: An arc-shaped limiting block is fixed on each of the four surrounding surfaces of the jack, and the centers of the inner arc surfaces of the four limiting blocks are located on the axis of the jack.

6. The overall lifting method of an offshore photovoltaic platform according to claim 1 or 2, characterized in that: The two groups of floats are respectively provided with a water pump for controlling the buoyancy of the floats.

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