Construction method of offshore photovoltaic platform

Abstract

The application relates to the technical field of offshore photovoltaic construction, and discloses a construction method of an offshore photovoltaic platform, which comprises the following steps: step one: land pre-assembly of the photovoltaic platform, first, assembling a truss, then installing purlines on the top of the truss, and finally installing photovoltaic panels on the top of the truss through the purlines; and step two: land pre-assembly of platform legs. The construction method of the offshore photovoltaic platform is characterized in that the land pre-assembly of the photovoltaic platform and the land pre-assembly of the platform legs are respectively carried out, and then the platform is transported to the site for assembly, so that the configuration of on-site construction ships and personnel is reduced compared with on-site part installation, most offshore construction is changed into land construction, the construction efficiency is improved, compared with the overall land assembly and transportation of the photovoltaic platform, the configuration of transportation ships is reduced, a plurality of photovoltaic platforms can be transported at a time, and the on-site assembly can reduce errors and improve installation precision.

Description

Technical Field

[0001] This invention relates to the field of offshore photovoltaic construction technology, specifically to a construction method for an offshore photovoltaic platform. Background Technology

[0002] Offshore photovoltaics is a novel approach to utilizing and developing marine energy resources. The marine environment differs from that on land. Under the same sunlight conditions, the open, unobstructed surface of the sea, coupled with longer hours of sunshine and higher radiation levels, makes offshore photovoltaic projects more efficient in utilizing sunlight, significantly increasing the power generation of offshore photovoltaic power plants.

[0003] Based on the analysis of conventional lake surface photovoltaic or intertidal photovoltaic construction cases, the existing construction technology is to assemble and install photovoltaic platforms in sections on-site. However, due to the poor sea conditions and limited on-site working space, it is difficult to deploy a large number of personnel at offshore photovoltaic construction sites. Applying this technology to offshore photovoltaics has many disadvantages, such as low construction efficiency, many overlapping operations, limited available time, and high on-site construction risks. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a construction method for an offshore photovoltaic platform, which solves the problems mentioned in the background.

[0005] This invention provides the following technical solution: a construction method for an offshore photovoltaic platform, comprising the following steps: Step 1: Pre-assembly of the photovoltaic platform on land. First, assemble the truss. After the truss is installed, install the purlins on the top of the truss. Finally, install the photovoltaic panels to the top of the truss through the purlins. Step 2: Pre-assembly of platform outriggers on land. The platform outrigger consists of three steel pipes welded together at one end. The three steel pipes are arranged in an inverted triangular pyramid shape. During pre-installation, only two of the steel pipes are pre-welded, and the other steel pipe is transported separately. The three steel pipes of the platform outrigger are then welded together on site. Step 3: Use a transport barge to transport the photovoltaic platform and its outriggers to the offshore construction site; Step 4: Use a crane vessel to assemble the photovoltaic upper platform and platform legs. Transport the photovoltaic upper platform and platform legs to both sides of the crane vessel. The crane vessel lifts the frame beam. After the frame beam is connected to the photovoltaic upper platform, the crane vessel rotates its boom to the other side. The other side of the crane vessel is used to arrange the transport barge for assembly, and the platform legs are arranged on the transport barge. The relative positions of the platform outriggers are arranged according to the actual measured relative positions of the pile foundations to ensure the accuracy of subsequent docking. Step 5: The overall installation of the photovoltaic platform at sea is carried out using a crane vessel. The crane vessel assembles the photovoltaic upper platform and platform legs into a whole. The crane vessel then lifts the frame beam, which connects the photovoltaic upper platform and platform legs to the assembly and installs it on the pile foundation, thus completing the installation.

[0006] Preferably, the offshore photovoltaic platform includes a photovoltaic upper platform and platform outriggers; The photovoltaic platform mainly consists of a truss, multiple purlins, and photovoltaic panels. The multiple purlins are connected to the top of the truss, and the photovoltaic panels are installed to the top of the truss through the multiple purlins. Each photovoltaic platform has four platform legs, and the bottom of the platform legs is connected to the top of the pile foundation.

[0007] Preferably, in step one, the truss includes two longitudinal outer frame trusses, two transverse outer frame trusses, and multiple longitudinal intermediate trusses; Two longitudinal outer frame trusses are placed in parallel, and two transverse outer frame trusses are installed between the two longitudinal outer frame trusses, with the two transverse outer frame trusses and the two longitudinal outer frame trusses being set perpendicular to each other. Multiple longitudinal intermediate trusses are installed between two transverse outer frame trusses and are perpendicular to each other. Multiple longitudinal intermediate trusses are arranged parallel to each other between two longitudinal outer frame trusses.

[0008] Preferably, each of the longitudinal intermediate trusses is equipped with a longitudinal cantilever truss at both ends.

[0009] Preferably, in step one, the photovoltaic flatland pre-assembly is supported by a bracket tool frame, which includes a vertical I-beam support, a horizontal I-beam support, and a fixed base. The horizontal I-beam support is connected to the side of the vertical I-beam support, and the fixed base is connected to the bottom of the vertical I-beam support. The bracket set is laid out and fixed on the site in advance to facilitate the assembly of the photovoltaic platform truss.

[0010] Preferably, the top of the horizontal I-beam support is provided with a coated protective felt, which is movably connected to the surface of the truss.

[0011] Preferably, in step three, a transport barge is used to transport the pre-assembled photovoltaic upper platform and platform legs. Each voyage of the transport barge transports 4 sets of photovoltaic upper platforms and platform legs. The transport barge is equipped with 9 sets of portal stacking fixtures, which are arranged in three rows and three layers inside the transport barge. The photovoltaic upper platforms are stacked by limiting the position of the portal stacking fixtures.

[0012] Preferably, the gate-shaped stacking fixture is reinforced with steel wire ropes 7 by binding between it and the photovoltaic upper platform and the transport barge.

[0013] Preferably, in step four, an electric hoist is arranged on one side of the frame lifting beam. After lifting, the electric hoist adjusts the photovoltaic upper platform to the designed angle by tightening the lifting rope.

[0014] Preferably, the photovoltaic upper platform is welded to the top of the platform leg, and the bottom of the platform leg is welded to the top of the pile foundation.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by pre-assembling the photovoltaic platform and platform legs on land separately, and then transporting them to the site for assembly, reduces the need for on-site construction vessels and personnel compared to on-site component installation. It transforms most of the offshore construction into on-site construction, thereby improving construction efficiency. Compared to the overall on-site assembly and transportation of the photovoltaic platform, it reduces the need for transport vessels and can transport multiple photovoltaic platforms at once. Furthermore, on-site assembly can reduce errors and improve installation accuracy.

[0016] 2. In this invention, a portal-shaped stacking fixture is set up in the transport barge. The portal-shaped stacking fixture is arranged in three rows and three layers inside the transport barge. The photovoltaic upper platform is stacked by limiting the position of the portal-shaped stacking fixture, which facilitates the fixing and limiting of the photovoltaic upper platform and the platform support legs, and facilitates the transportation of multiple photovoltaic platforms at one time.

[0017] 3. In this invention, by setting up a bracket tooling frame, the bracket tooling frame is laid out and fixed on the site in advance, which facilitates the assembly of the photovoltaic platform truss. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the photovoltaic platform structure of the present invention; Figure 2 This is a schematic diagram of the longitudinal outer frame truss arrangement structure of the present invention; Figure 3 This is a schematic diagram of the horizontal outer frame truss installation structure of the present invention; Figure 4 This is a schematic diagram of the longitudinal intermediate truss installation structure of the present invention; Figure 5 This is a schematic diagram of the longitudinal cantilever truss installation structure of the present invention; Figure 6 This is a schematic diagram of the purlin installation structure of the present invention; Figure 7 This is a schematic diagram of the bracket structure of the cow leg tooling of the present invention; Figure 8 This is a schematic diagram of the transport barge structure of the present invention; Figure 9 This is a schematic diagram of the arrangement structure of the door-type stacking tooling of the present invention; Figure 10 This is a schematic diagram of the photovoltaic upper platform and platform support leg assembly structure of the present invention; Figure 11 This is a schematic diagram of the photovoltaic platform and pile foundation assembly structure of the present invention.

[0019] In the diagram: 1. Photovoltaic upper platform; 101. Longitudinal outer frame truss; 102. Transverse outer frame truss; 103. Longitudinal intermediate truss; 104. Longitudinal cantilever truss; 105. Purlin; 2. Platform support legs; 3. Pile foundation; 4. Corbel jig; 401. Vertical I-beam support; 402. Horizontal I-beam support; 403. Fixed chassis; 404. Coated protective felt; 5. Portal-type stacking jig; 6. Transport barge; 7. Wire rope; 8. Frame lifting beam; 9. Electric hoist. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-11 A construction method for an offshore photovoltaic platform includes the following steps: Step 1: Pre-assembly of the photovoltaic platform 1 on land. First, assemble the truss. After the truss is installed, install the purlins 105 on the top of the truss. Finally, install the photovoltaic panels to the top of the truss through the purlins 105. Step 2: Pre-assembly of platform support leg 2 on land. Platform support leg 2 consists of three steel pipes welded together at one end. The three steel pipes are arranged in an inverted triangular pyramid shape. During pre-installation, only two of the steel pipes are welded in advance, and the other steel pipe is transported separately. The three steel pipes of platform support leg 2 are then welded together on site. Step 3: Use transport barge 6 to transport the photovoltaic upper platform 1 and platform outriggers 2 to the offshore construction site; Step 4: Use a crane ship to assemble the photovoltaic upper platform 1 and platform legs 2. The photovoltaic upper platform 1 and platform legs 2 are transported to both sides of the crane ship. The crane ship lifts the frame lifting beam 8. After the frame lifting beam 8 is connected to the photovoltaic upper platform 1, the crane ship rotates its boom to the other side. The other side of the crane ship is arranged with the assembly transport barge 6, and the platform legs 2 are arranged on the transport barge 6. The relative positions of the platform outriggers 2 are arranged according to the actual measured relative positions of the pile foundations 3 to ensure the accuracy of subsequent docking. Step 5: The overall installation of the photovoltaic platform at sea is carried out by a crane vessel. The crane vessel assembles the photovoltaic upper platform 1 and the platform legs 2 into a whole. The crane vessel then lifts the frame beam 8, which connects the photovoltaic upper platform 1 and the platform legs 2 into a combination and installs it on the pile foundation 3 to complete the installation. The photovoltaic upper platform 1 is welded to the top of the platform support leg 2, and the bottom of the platform support leg 2 is welded to the top of the pile foundation 3.

[0022] Please see Figure 1 The offshore photovoltaic platform includes a photovoltaic upper platform 1 and platform legs 2. The photovoltaic upper platform 1 mainly consists of a truss, multiple purlins 105 and photovoltaic panels. The multiple purlins 105 are connected to the top of the truss, and the photovoltaic panels are installed to the top of the truss through the multiple purlins 105. Each photovoltaic platform has four platform legs 2, and the bottom end of the platform legs 2 is connected to the top of the pile foundation 3.

[0023] Please see Figure 1-5 In step one, the truss includes two longitudinal outer frame trusses 101, two transverse outer frame trusses 102, and multiple longitudinal intermediate trusses 103. The two longitudinal outer frame trusses 101 are placed in parallel. The two transverse outer frame trusses 102 are installed between the two longitudinal outer frame trusses 101, and the two transverse outer frame trusses 102 are perpendicular to each other. The multiple longitudinal intermediate trusses 103 are installed between the two transverse outer frame trusses 102 and are perpendicular to each other. The multiple longitudinal intermediate trusses 103 are arranged in parallel between the two longitudinal outer frame trusses 101. Each longitudinal intermediate truss 103 has a longitudinal cantilever truss 104 installed at both ends.

[0024] Please see Figure 7 In step one, the photovoltaic platform truss is pre-assembled using a bracket jig 4 for support. The bracket jig 4 includes a vertical I-beam support 401, a horizontal I-beam support 402, and a fixed base 403. The horizontal I-beam support 402 is connected to the side of the vertical I-beam support 401, and the fixed base 403 is connected to the bottom of the vertical I-beam support 401. The bracket jig 4 is laid out and fixed on the site in advance to facilitate the assembly of the photovoltaic platform truss. The top of the horizontal I-beam support 402 is provided with a coated protective felt 404, which is movably connected to the surface of the truss.

[0025] Please see Figure 8-9 In step three, transport barge 6 is used to transport the pre-assembled photovoltaic upper platform 1 and platform support legs 2. Each voyage of transport barge 6 transports 4 sets of photovoltaic upper platform 1 and platform support legs 2. Nine sets of portal stacking fixtures 5 are arranged on transport barge 6. The portal stacking fixtures 5 are arranged in three rows and three layers inside transport barge 6. The photovoltaic upper platform 1 is stacked by limiting the portal stacking fixtures 5. Steel wire ropes 7 are installed between the portal stacking fixtures 5 and the photovoltaic upper platform 1 and the transport barge 6 for binding and reinforcement.

[0026] Please see Figure 10-11 In step four, an electric hoist 9 is arranged on one side of the frame lifting beam 8. After lifting, the electric hoist 9 adjusts the photovoltaic upper platform 1 to the designed angle by tightening the lifting rope.

[0027] After the photovoltaic upper platform 1 and platform support legs 2 are pre-installed, they are transported to the transport barge 6. The transport barge 6 is equipped with nine sets of portal stacking fixtures 5. Each photovoltaic upper platform 1 is supported by three sets of portal stacking fixtures 5. The nine sets of portal stacking fixtures 5 are arranged in three rows and three layers inside the transport barge 6. The photovoltaic upper platforms 1 are stacked by limiting the movement of the portal stacking fixtures 5, and the platform support legs 2 are stacked on the transport barge. 6. In the open space inside, steel wire ropes 7 are used to secure the portal stacking fixture 5 and the photovoltaic upper platform 1. Steel wire ropes 7 are then used to secure the portal stacking fixture 5 and the transport barge 6 to improve stability during transport. A crane vessel is used to assemble the photovoltaic upper platform 1 and platform legs 2. The photovoltaic upper platform 1 and platform legs 2 are transported to both sides of the crane vessel. The crane vessel lifts the frame lifting beam 8. After the frame lifting beam 8 connects to the photovoltaic upper platform 1, the crane vessel rotates its boom to the other side. On the other side of the crane vessel, a transport barge 6 for assembly is arranged, with platform legs 2 mounted on the barge. The relative positions of the platform legs 2 are arranged according to the actual measured relative positions of the pile foundations 3 to ensure the accuracy of subsequent docking. The overall offshore installation of the photovoltaic platform is carried out by the crane vessel. After the crane vessel assembles the photovoltaic upper platform 1 and platform legs 2 into a whole, it lifts the frame lifting beam 8, which connects the photovoltaic upper platform 1 and platform legs 2 assembly and installs them on the pile foundations 3 to complete the installation. The photovoltaic upper platform 1 and platform legs 2 are pre-assembled on land separately, and then transported to the site for assembly. Compared with the on-site installation of parts, this reduces the on-site construction vessels and personnel, transforms most of the offshore construction into on-site construction, and improves construction efficiency. Compared with the overall on-site assembly and transportation of the photovoltaic platform, it reduces the configuration of transport vessels and can transport multiple photovoltaic platforms at one time. On-site assembly can also reduce errors and improve installation accuracy.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method for an offshore photovoltaic platform, characterized in that, Includes the following steps: Step 1: Photovoltaic platform (1) Land pre-assembly. First, the truss is assembled. After the truss is installed, the purlins (105) are installed on the top of the truss. Finally, the photovoltaic panels are installed on the top of the truss through the purlins (105). Step 2: Pre-assembly of platform legs (2) on land. Platform legs (2) are made of three steel pipes welded together at one end. The three steel pipes are arranged in an inverted triangular cone shape. During pre-installation, only two of the steel pipes are welded in advance, and the other steel pipe is transported separately. The three steel pipes of platform legs (2) are then welded together on site. Step 3: Use a transport barge (6) to transport the photovoltaic upper platform (1) and platform outriggers (2) to the offshore construction site; Step 4: Use a crane ship to assemble the photovoltaic upper platform (1) and platform legs (2). The photovoltaic upper platform (1) and platform legs (2) are transported to both sides of the crane ship. The crane ship lifts the frame lifting beam (8). After the frame lifting beam (8) is connected to the photovoltaic upper platform (1), the crane ship rotates its boom to the other side. The other side of the crane ship is arranged with a transport barge (6) for assembly. The platform legs (2) are arranged on the transport barge (6). The relative positions of the platform legs (2) are arranged according to the actual measured relative positions of the pile foundations (3) to ensure the accuracy of subsequent docking. Step 5: The overall installation of the photovoltaic platform at sea is carried out by a crane vessel. The crane vessel assembles the photovoltaic upper platform (1) and the platform legs (2) into a whole. The crane vessel lifts the frame beam (8), and the frame beam (8) connects the photovoltaic upper platform (1) and the platform legs (2) to the pile foundation (3) to complete the installation.

2. The construction method for an offshore photovoltaic platform according to claim 1, characterized in that, The offshore photovoltaic platform includes a photovoltaic upper platform (1) and platform legs (2); The photovoltaic platform (1) mainly consists of a truss, multiple purlins (105) and photovoltaic panels. Multiple purlins (105) are connected to the top of the truss. The photovoltaic panels are installed to the top of the truss through multiple purlins (105). Each photovoltaic platform has four platform legs (2). The bottom of the platform legs (2) is connected to the top of the pile foundation (3).

3. The construction method for an offshore photovoltaic platform according to claim 2, characterized in that, In step one, the truss includes two longitudinal outer frame trusses (101), two transverse outer frame trusses (102), and multiple longitudinal intermediate trusses (103). Two longitudinal outer frame trusses (101) are placed in parallel, and two transverse outer frame trusses (102) are installed between the two longitudinal outer frame trusses (101), and the two transverse outer frame trusses (102) are set perpendicular to the two longitudinal outer frame trusses (101). Multiple longitudinal intermediate trusses (103) are installed between two transverse outer frame trusses (102) and are perpendicular to each other. Multiple longitudinal intermediate trusses (103) are arranged in parallel between two longitudinal outer frame trusses (101).

4. The construction method for an offshore photovoltaic platform according to claim 3, characterized in that, Each of the longitudinal intermediate trusses (103) is fitted with a longitudinal cantilever truss (104) at both ends.

5. The construction method for an offshore photovoltaic platform according to claim 4, characterized in that, In step one, the photovoltaic flatland pre-assembly is supported by a bracket tool frame (4). The bracket tool frame (4) includes a vertical I-beam support (401), a horizontal I-beam support (402), and a fixed base (403). The horizontal I-beam support (402) is connected to the side of the vertical I-beam support (401), and the fixed base (403) is connected to the bottom of the vertical I-beam support (401). The bracket (4) is laid out and fixed on the site in advance to facilitate the assembly of the photovoltaic platform truss.

6. The construction method for an offshore photovoltaic platform according to claim 5, characterized in that, The top of the horizontal I-beam support (402) is provided with a coated protective felt (404), which is movably connected to the surface of the truss.

7. The construction method for an offshore photovoltaic platform according to claim 1, characterized in that, In step three, a transport barge (6) is used to transport the pre-assembled photovoltaic upper platform (1) and platform legs (2). The transport barge (6) transports 4 sets of photovoltaic upper platforms (1) and platform legs (2) per voyage. Nine sets of portal stacking fixtures (5) are arranged on the transport barge (6). The portal stacking fixtures (5) are arranged in three rows and three layers inside the transport barge (6). The photovoltaic upper platform (1) is stacked by limiting the position of the portal stacking fixtures (5).

8. The construction method for an offshore photovoltaic platform according to claim 7, characterized in that, The gate-type stacking fixture (5) is reinforced with steel wire ropes (7) by binding it to the photovoltaic upper platform (1) and the transport barge (6).

9. The construction method for an offshore photovoltaic platform according to claim 1, characterized in that, In step four, an electric hoist (9) is arranged on one side of the frame lifting beam (8). After lifting, the electric hoist (9) adjusts the photovoltaic upper platform (1) to the designed angle by tightening the lifting rope.

10. A construction method for an offshore photovoltaic platform according to claim 1, characterized in that, The photovoltaic upper platform (1) is welded to the top of the platform leg (2), and the bottom of the platform leg (2) is welded to the top of the pile foundation (3).

Images