Floating platform launching and undocking construction method

Abstract

The invention relates to the technical field of offshore wind power, in particular to a launching and undocking construction method for a floating platform. Comprising the following steps: closing a dock gate, and injecting water into a dock until a floating platform floats; the semi-submersible barge dives, so that a deck of the semi-submersible barge is lower than the bottom surface of the floating platform; the floating platform is moved to the position above the semi-submersible barge; the semi-submersible barge floats until the floating platform is piled on the deck; and the dock gate is opened to drive the semi-submersible barge and the floating platform to pass through the dock entrance together. The first dock area and the second dock area assembly which are connected and the launching floating platform are utilized, and the problems that an existing small dock cannot meet the launching requirement of a large-size floating platform, and a large dock is difficult in production scheduling and long in occupied production period can be solved; the semi-submersible barge lightering wind power foundation platform is used, long-distance transportation of the wind power foundation platform can be achieved, the wind power foundation platform can be conveniently moved to wind power plants all over the world, offshore wind power installation is completed after a fan unit is hoisted nearby, large-scale production is achieved, cost is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and particularly to a construction method for launching and dry-docking a floating platform. Background Art

[0002] At present, wind power is developing towards deep and far sea areas. Traditional fixed wind power can no longer meet the requirements of wind power development in deep and far sea areas, and floating wind power is attracting more and more attention. Floating wind power mainly includes two parts: a wind power foundation platform and a wind turbine unit. The wind power foundation platform is used to provide buoyancy and ensure stability so that the wind turbine unit thereon can work normally. The wind turbine unit includes a tower, a generator, and a wind wheel arranged on the upper part of the tower. The wind power foundation platform is usually prefabricated on shore and then assembled in a shipyard or at a dock. However, as offshore wind power develops towards deep and far sea areas, in order to improve the efficiency and stability of wind turbines, the size of offshore wind power platforms is getting larger and larger, and the wind power foundation platform reaches more than one hundred meters. Traditional small shipyards and small docks are difficult to meet the requirements of general assembly and launching of large-sized wind power foundation platforms, while large shipyards have difficult production scheduling. The wind power foundation platform occupies a long production cycle. Using a large semi-submersible barge, it can be launched by lightering from the dock, but after launching, secondary outfitting and various tests need to be carried out at the dockside, which requires a relatively deep water depth at the dock front and high sea conditions. Therefore, it is difficult to find a suitable production base and ship machinery equipment in time for the production of large floating wind power foundation platforms. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems in the background art that traditional small shipyards and small docks are difficult to meet the requirements of general assembly and launching of large-sized wind power foundation platforms, while large shipyards have difficult production scheduling, and to provide a construction method for launching and dry-docking a floating platform.

[0004] The present invention provides a construction method for launching and dry-docking a floating platform, which includes a first dock area and a second dock area connected to each other. The bottom surface of the first dock area is lower than the bottom surface of the second dock area. The semi-submersible barge is located in the first dock area, and the floating platform is located in the second dock area; It includes the following steps: Close the dock gate and fill the dock with water until the floating platform floats; Submerge the semi-submersible barge so that the deck of the semi-submersible barge is lower than the bottom surface of the floating platform; Move the floating platform above the semi-submersible barge; Float the semi-submersible barge until the floating platform sits on the deck; Open the dock gate and drive the semi-submersible barge and the floating platform to pass through the dock entrance together.

[0005] The floating platform launching and dry-docking construction method described in the present invention assembles and launches the floating platform using the connected first dock area and second dock area, which can solve the problem that existing small shipyards cannot meet the need for launching large-sized floating platforms, while large shipyards have difficult production scheduling and long production cycle occupancy; after the floating platform is built or assembled in the second dock area, the dock is filled with water to make the floating platform float, and then the floating platform is moved onto a semi-submersible barge. Compared with assembling the floating platform at the dock and then roll-on / roll-off onto the semi-submersible barge, the present invention can greatly reduce the construction difficulty and cost; compared with assembling the floating platform on the semi-submersible barge, there is no risk of capsizing during the assembly process of the floating platform in the present invention, which can greatly improve the construction safety; in a preferred embodiment, the floating platform is a wind power foundation platform. The present invention uses a semi-submersible barge to transport the wind power foundation platform, which can achieve long-distance transportation of the wind power foundation platform, facilitate the movement of the wind power foundation platform to wind farms around the world, and complete the installation of offshore wind power after hoisting the wind turbine units nearby, enabling large-scale production, which is beneficial to cost reduction and construction period shortening.

[0006] Preferably, the floating platform is a wind power foundation platform, and the floating platform includes three columns arranged in a triangle, and floating bodies are provided between adjacent columns; It further includes the following steps: S4. Use the semi-submersible barge to tow the floating platform to the submerging point for floating unloading; S5. Tow the floating platform to the installation dock to install the wind turbine units.

[0007] In a preferred solution, when constructing an offshore floating wind turbine, the wind power foundation platform is built or assembled in the second dock area. After the wind power foundation platform is removed from the dock, it is towed to the installation dock and then the wind turbine units are installed. The wind power foundation platform has the advantages of low height and good stability compared with the overall structure after the wind turbine units are installed, which can reduce the long-distance transportation cost and improve safety.

[0008] The floating platform launching and dry-docking construction method described in the present invention uses deep and shallow docks to build or assemble the wind power foundation platform, and then transfers the built wind power foundation platform to the installation dock near the offshore wind farm to install the wind turbine units, which can make full use of the existing conditions and better solve the problem of difficult production scheduling in large docks or large shipyards, while small docks or small marinas cannot meet the construction needs; the wind power foundation platform has better stability than the overall structure after the wind turbine units are installed, with low long-distance towing cost and high safety, and can achieve a large-scale production mode of deep and shallow dock assembly + long-distance barge delivery + on-site hoisting of wind turbine units at the wind farm; it is beneficial to cost reduction and construction period reduction.

[0009] Preferably, two first towers are provided at the bow of the semi-submersible barge, and two second towers are provided at the stern of the semi-submersible barge; before step S1, the semi-submersible barge is modified: at least one of the second towers is rotated so that its dimension in the length direction of the semi-submersible barge is smaller than its dimension in the width direction of the semi-submersible barge.

[0010] Preferably, the second tower includes at least two floating boxes arranged separately along the length direction of the semi-submersible barge. Define the two sides of the floating box in the width direction as the first side and the second side respectively. The floating box includes a lower section and an upper section, and the center of gravity of the upper section is located on the second side of the center of gravity of the lower section.

[0011] Preferably, when rotating the second tower, each floating box is rotated and moved to a designated position respectively. After rotation, all the floating boxes are arranged along the width direction of the semi-submersible barge, including the following steps: A1. A ballast is arranged on the first side of the lower section of the floating box; The floating box is lifted, and a sliding track is laid under the bottom plate of the floating box; The floating box is lowered onto the sliding track, and the floating box moves along the sliding track to the designated position; A2. The floating box is lifted, and the sliding track under the bottom plate of the floating box is removed; The floating box is lowered onto the deck.

[0012] Preferably, a breather pipeline is connected between the floating box and the semi-submersible barge. The breather pipeline includes a plurality of first pipe sections arranged inside the semi-submersible barge and a plurality of second pipe sections arranged inside the floating box. The first pipe sections and the second pipe sections are detachably connected; Before lifting the floating box in step A1: disconnect the first pipe section and the second pipe section; It further includes step A3: a connection main pipe is arranged on the semi-submersible barge, and a plurality of the first pipe sections are connected to the connection main pipe, and a plurality of the second pipe sections are connected to the connection main pipe.

[0013] Preferably, jacking grooves are provided at the lower parts of the four corners of the floating box, and the jacking mechanism is arranged between the bottom of the jacking groove and the deck.

[0014] Preferably, the sliding track includes a front translation section, a rotation section and a rear translation section. The front translation section extends along the width direction of the semi-submersible barge, and the rear translation section extends along the length direction of the semi-submersible barge; the floating box rotates on the rotation section.

[0015] Preferably, before step S1, the dock entrance is widened so that the width of the dock entrance is greater than the width of the floating platform; it includes the following steps: A cofferdam is arranged outside the dock entrance, and the cofferdam isolates the first dock area from the external water area; Drain the water inside the cofferdam; Demolish the water retaining wall and water retaining structure on one side of the dock entrance, and the water retaining structure includes artificial structures and / or mountains; Construct a new water retaining wall.

[0016] Preferably, water retaining walls are arranged on both sides of the dock entrance, and the height of the top surface of the water retaining wall above the water surface of the external water area is H1; the width of the semi-submersible barge is smaller than the width of the dock entrance, and the width of the floating platform is larger than the width of the dock entrance; in step S2, when the semi-submersible barge floats: float the semi-submersible barge until the bottom surface of the protruding part of the floating platform above the semi-submersible barge is higher than the water surface in the dock by a height of H2, and H2≥H1.

[0017] Preferably, a semi-submersible barge winch is arranged on the semi-submersible barge, and shore winches are arranged on the shore around the first dock area and the second dock area; in step S2, when moving the floating platform above the semi-submersible barge: the semi-submersible barge winch is connected to one side of the floating platform close to the semi-submersible barge through a first cable to tow the floating platform towards the semi-submersible barge; the shore winch is connected to the side of the floating platform far from the semi-submersible barge through a second cable to control the direction and deceleration of the floating platform.

[0018] Preferably, semi-submersible barge winches and semi-submersible barge bollards are arranged at the four corners of the semi-submersible barge, and shore bollards are arranged on the shore around the first dock area and the second dock area; in step S3, when driving the semi-submersible barge and the floating platform to pass through the dock entrance together: the semi-submersible barge winch is connected to the shore bollard through a first cable, and the shore winch is connected to the semi-submersible barge bollard through a second cable, and there is an included angle between the first cable and the second cable connected to the same corner of the semi-submersible barge.

[0019] Preferably, the bottom surface of the first dock area is lower than the water surface of the external water area, the bottom surface of the second dock area is higher than the water surface of the external water area, and the dock entrance communicates the first dock area and the external water area.

[0020] Preferably, the dock gate is a floating dock gate. In step S1: move the floating dock gate to the dock entrance to close the dock gate; in step S3, move the floating dock gate away from the dock entrance to open the dock gate.

[0021] Preferably, in step S4, the floating unloading includes the following steps: the semi-submersible barge dives until the floating platform floats; move the floating platform away from above the semi-submersible barge.

[0022] Compared with the prior art, the beneficial effects of the present invention: The construction method for launching and undocking a floating platform according to the present invention assembles and launches the floating platform using the connected first dock area and second dock area, which can solve the problems that existing small shipyards cannot meet the need for launching large-sized floating platforms, while large shipyards have difficult production scheduling and long occupation of the production cycle. After the construction or assembly of the floating platform is completed in the second dock area, water is injected into the dock to make the floating platform float, and then the floating platform is moved onto a semi-submersible barge. Compared with assembling the floating platform at the dock and then ro-ro loading it onto the semi-submersible barge, the present invention can greatly reduce the construction difficulty and cost. Compared with assembling the floating platform on the semi-submersible barge, there is no risk of capsizing during the assembly process of the floating platform in the present invention, which can greatly improve the construction safety. In a preferred embodiment, the floating platform is a wind power foundation platform. The present invention uses a semi-submersible barge to transport the wind power foundation platform, which can achieve long-distance transportation of the wind power foundation platform, facilitate moving the wind power foundation platform to wind farms around the world, hoisting the wind turbine units nearby and then completing the installation of offshore wind power, and can realize large-scale production, which is beneficial to reducing costs and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the steps of the construction method for launching and undocking the floating platform described in Embodiment 1 Figure 1 ; Figure 2 Schematic diagram of the steps of the construction method for launching and undocking the floating platform described in Embodiment 1 Figure 2 ; Figure 3 Schematic diagram of the steps of the construction method for launching and undocking the floating platform described in Embodiment 1 Figure 3 ; Figure 4 Schematic diagram of the steps of the construction method for launching and undocking the floating platform described in Embodiment 1 Figure 4 ; Figure 5 Schematic diagram of the steps of the construction method for launching and undocking the floating platform described in Embodiment 1 Figure 5 ; Figure 6 Schematic diagram of the steps of the construction method for launching and undocking the floating platform described in Embodiment 1 Figure 6 ; Figure 7 Plan view of the construction method for launching and undocking the floating platform described in Embodiment 2; Figure 8 Plan view of the construction method for launching and undocking the floating platform described in Embodiment 6; Figure 9 Plan view of the first layout mode in Embodiment 7; Figure 10 Front view of the first layout mode in Embodiment 7; Figure 11 For Figure 10Enlarged view of part A; Figure 12 is Figure 10 Enlarged view of part B; Figure 13 is the plan view of the second layout mode in Embodiment 7; Figure 14 is the front view of the second layout mode in Embodiment 7; Figure 15 is the plan view of the special semi-submersible barge described in Embodiment 3; Figure 16 is the structural diagram of the second tower (before rotation) described in Embodiment 3; Figure 17 is the structural diagram of the front translation section described in Embodiment 3; Figure 18 is the structural diagram of the rotation section described in Embodiment 3; Figure 19 is the structural diagram of the rear translation section described in Embodiment 3; Figure 20 is the plan view of the roller car and the jacking mechanism described in Embodiment 3; Figure 21 is the schematic diagram of the jacking groove (side view) described in Embodiment 3; Figure 22 is the cross-sectional view of the caisson described in Embodiment 1; Figure 23 is the top view of the caisson described in Embodiment 1.

[0024] Markings in the figure: 1 - First dock area; 11 - Dock entrance; 12 - Floating dock gate; 13 - Dock gate storage area; 14 - Cofferdam; 15 - Water retaining wall; 16 - Second cable; 17 - Third cable; 2 - Second dock area; 21 - Caisson; 22 - Concrete surface layer; 23 - Rockfill; 3 - Floating platform; 31 - First column; 32 - Second column; 33 - Third column; 34 - Lower floating body; 4 - Semi-submersible barge; 41 - Deck; 42 - First tower; 43 - Second tower; 44 - First floating box; 441 - Upper section; 442 - Lower section; 443 - Vent pipe; 444 - Roller trolley; 445 - Jacking mechanism; 446 - Jacking groove; 447 - Front translation section; 448 - Rotation section; 449 - Rear translation section; 4410 - Latching plate; 4411 - First side; 4412 - Second side; 4413 - Ballast 45 - Second floating box; 46 - First cable; 47 - Pier; 48 - Steel box girder assembly; 49 - Connecting main pipe. Detailed implementation mode

[0025] The present invention will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0026] In the description of the specific embodiments of the present invention, without special explanation, the expression terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invention product / device / device is usually used. These orientation or position relationship terms are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship. Therefore, it should not be construed as a limitation to the present invention.

[0027] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel" etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the "horizontal", "vertical", "hanging", "parallel" etc. directions, and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present invention.

[0028] In addition, the use of terms such as "first", "second", "third", etc. in the terminology is merely for distinguishing the description of identical or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0029] In addition, in the description of the embodiments of the present invention, "several", "multiple", and "a number of" represent at least 2. It can be any case such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and can even be a case exceeding 9.

[0030] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be common connection means in the art such as welding, riveting, bolting, threaded connection, etc. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0031] Embodiment 1 As Figures 1 to 6 shown, this embodiment provides a construction method for launching and undocking a floating platform, including a connected first dock area 1 and a second dock area 2. The bottom surface of the first dock area 1 is lower than the bottom surface of the second dock area 2. A semi-submersible barge 4 is located in the first dock area 1, and a floating platform 3 is located in the second dock area 2; the following steps are included: S1. The dock gate is closed, and water is injected into the dock until the floating platform 3 floats; The semi-submersible barge 4 dives, so that the deck 41 of the semi-submersible barge 4 is lower than the bottom surface of the floating platform 3; S2. Move the floating platform 3 above the semi-submersible barge 4; The semi-submersible barge 4 floats until the floating platform 3 is seated on the deck 41; S3. The dock gate is opened, and the semi-submersible barge 4 and the floating platform 3 are driven to pass through the dock entrance 11 together.

[0032] The floating platform launching and dry-docking construction method described in this embodiment uses the first dock area 1 and the second dock area 2 connected to each other for the general assembly and launching of the floating platform 3, which can solve the problems that existing small shipyards cannot meet the launching needs of large-sized floating platforms 3, while large shipyards have difficult production scheduling and long occupation of the production cycle. After the construction or general assembly of the floating platform 3 is completed in the second dock area 2, the dock is filled with water to make the floating platform 3 float, and then the floating platform 3 is moved onto the semi-submersible barge 4. Compared with the general assembly of the floating platform 3 at the dock and then roll-on / roll-off onto the semi-submersible barge, this embodiment can greatly reduce the construction difficulty and cost. Compared with the general assembly of the floating platform 3 on the semi-submersible barge, there is no risk of capsizing during the general assembly process of the floating platform 3 in the present invention, which can greatly improve the construction safety. In a preferred embodiment, the floating platform 3 is a wind power foundation platform. The present invention uses the semi-submersible barge 4 to transport the wind power foundation platform, which can realize the long-distance transportation of the wind power foundation platform, facilitate the movement of the wind power foundation platform to wind farms around the world, and complete the offshore wind power installation after hoisting the wind turbine units nearby. It can achieve large-scale production, which is conducive to cost reduction and construction period shortening.

[0033] The semi-submersible barge 4, also known as a semi-submersible mother ship, is provided with a deck 41 for carrying goods. The semi-submersible barge 4 has a ballast water system and can adjust the draft by injecting or discharging ballast water. In the deep draft state, the deck 41 can be submerged below the water surface, and in the shallow draft state, the deck 41 can emerge above the water surface. The width of the semi-submersible barge 4 used in this embodiment is smaller than the width of the dock entrance 11, enabling it to pass through the dock entrance 11.

[0034] The dock gate can be a floating dock gate 12. The floating dock gate 12 is a dock gate structure with a floating function. Compartments can be provided inside it, and it can be seated or floated by injecting or discharging ballast water. In the floating state, the floating dock gate 12 can move. When the floating dock gate 12 moves to the dock entrance 11, it can close the dock entrance 11 by seating. Preferably, there is also a dock gate storage area 13 for storing the floating dock gate 12. After the floating dock gate 12 is moved away from the dock entrance 11, it can be placed in the dock gate storage area 13.

[0035] Water retaining walls 15 are provided on both sides of the dock entrance 11. The water retaining walls 15 can be made of concrete. The side walls of the floating dock gate 12 can be hermetically matched with the water retaining walls 15 to close the dock entrance 11.

[0036] Preferably, the bottom surface of the first dock area 1 is lower than the water surface of the external water area, and the bottom surface of the second dock area 2 is higher than the water surface of the external water area. The dock entrance 11 communicates with the first dock area 1 and the water surface of the external water area, and the dock gate is matched with the dock entrance 11. The first dock area 1 is also called the deep dock area, and the second dock area 2 is also called the shallow dock area. The submerging of the semi-submersible barge 4 in step S1 and the movement of the floating platform 3 in step S2 can also be carried out synchronously.

[0037] Preferably, the deep and shallow docks in this embodiment have the following three working conditions: Passing condition: The dock gate is opened, the dock entrance 11 is unobstructed, the water surface of the first dock area 1 is at the same level as the water surface of the external water area, the semi-submersible barge 4 can pass between the first dock area 1 and the external water area, and the floating platform 3 can be built or assembled in the second dock area 2; Low water level condition: The dock gate is closed, the dock entrance 11 is in a closed state, the water surface of the first dock area 1 is lower than the water surface of the external water area, and even the bottom surface of the first dock area 1 is exposed; High water level condition: The dock gate is closed, the dock entrance 11 is in a closed state, and the water surfaces of the first dock area 1 and the second dock area 2 are higher than the water surface of the external water area.

[0038] Taking a certain deep and shallow dock as an example: The elevation of the water surface of the external water area is 0m, the bottom elevation of the first dock area 1 is -12.8m, the bottom elevation of the second dock area 2 is about +3.2m, the water storage elevation in the dock can reach +14.9m, the maximum water depth of the second dock area 2 is 11.7m, and the maximum water depth of the first dock area 1 is 27.7m.

[0039] In some embodiments, the second dock area 2 is widened before step S1 to meet the construction requirements of the large floating platform 3.

[0040] Preferably, as Figure 22 and Figure 23 shown, a caisson 21 is arranged on the side of the second dock area 2 close to the first dock area 1. The caisson 21 includes a bottom plate and side walls. A number of compartments are arranged inside the caisson 21 and can be used to fill crushed stones, etc. The bottom plate of the caisson 21 is located on the bottom surface of the first dock area 1. A concrete surface layer 22 can be poured on the upper part of the caisson 21, and the concrete surface layer 22 is connected to the surface layer of the second dock area 2. The caisson 21 is a prefabricated component, and the sealed bottom plate and side walls enable the caisson 21 to float on the water; The construction includes the following steps: Move the prefabricated caisson 21 to the first dock area 1 and float it on the water; Close the dock gate and drain part of the water in the deep and shallow docks to lower the water level of the first dock area 1 so that the water level of the first dock area 1 is lower than the height of the caisson 21; Move the caisson 21 to the installation position and inject crushed stones, soil bodies, etc. into the caisson 21 to make it sit on the bottom surface of the first dock area 1; Construct the concrete surface layer 22 above the caisson 21.

[0041] Using the caisson 21 to widen the second dock area 2 has the advantages of convenient construction and relatively low overall cost; moreover, the caisson 21 is an integral structure and has a relatively large vertical bearing capacity, which can reach more than 250 KPa after calculation, and can meet the needs of installing large equipment such as gantry cranes and crawler cranes in the second dock area 2. The side wall of the caisson 21 is a vertical surface, so that the widened second dock area 2 has a relatively large front water depth near the first dock area 1, which can meet the draft requirements of large ships and facilitate loading and unloading.

[0042] In addition, the caisson 21 also has the advantage of being easily demolished. When it is necessary to expand the width of the first dock area 1: the water level of the first dock area 1 can be first lowered below the top surface of the caisson 21; then the concrete surface layer 22 is demolished, the crushed stones in the caisson 21 are dug out, and the internal water body is drained, so that the caisson 21 floats on the water, and then it is towed out of the dock.

[0043] In some working conditions, a slope is provided at the position of the second dock area 2 adjacent to the first dock area 1. The space between the caisson 21 and the slope can be backfilled with block stone fillers 23, and a two-layer stone cushion layer, a cement stabilizing layer and a concrete layer are sequentially arranged on the top of the block stone fillers 23; in the preferred working condition: the thickness of the two-layer stone cushion layer is 300 mm, the thickness of the cement stabilizing layer is 300 mm, and the concrete layer is made of C35 concrete with a thickness of 400 mm.

[0044] The floating platform 3 can be built or assembled in the second dock area 2. The floating platform 3 can be a wind power foundation platform, an oil platform, etc. The wind power foundation platform is the lower structure of an offshore floating wind power, including columns and a lower floating body 34. Both the columns and the lower floating body 34 can be floating body structures. For example, the columns are cylindrical floating bodies, and the lower floating body 34 is a rectangular floating body; during assembly, the steel structure segments prefabricated in the steel structure factory can be transported to the dock of the second dock area 2 by a transport ship, and then the steel structure segments can be lifted to the yard of the second dock area 2 by a lifting device on the second dock area 2, such as a crawler crane.

[0045] In step S1, the dock gate is closed to isolate the inside of the dock from the outside. Water is injected into the dock to make the water level inside the dock higher than the bottom surface of the second dock area 2, and the floating platform 3 is made to float; the semi-submersible barge 4 dives in the first dock area 1.

[0046] In step S2, the floating platform 3 can be towed and moved above the semi-submersible barge 4. At this time, the bottom surface of the floating platform 3 and the deck 41 are spaced up and down; then the semi-submersible barge 4 drains water and floats up so that the floating platform 3 sits on the deck 41. The semi-submersible barge 4 can continue to float up so that the floating platform 3 is carried on the semi-submersible barge 4, or the deck 41 is raised above the water surface.

[0047] In some embodiments, a semi-submersible barge winch and a semi-submersible barge bollard are provided on the semi-submersible barge 4, an onshore winch and an onshore bollard are provided on the shore, and the onshore winch includes a first onshore winch and a second onshore winch; in step S2: by using a traffic boat or a heaving line, the cable of the semi-submersible barge winch is towed to the floating platform 3 for mooring, serving as the power and direction control cable for movement; the first onshore winch is connected to the floating platform 3 through a second cable 16 for tailing, controlling the forward direction and deceleration of the floating platform 3; four second onshore winches are respectively connected to the connecting members, such as semi-submersible barge bollards, arranged at the four corners of the semi-submersible barge 4 through third cables 17 to fix the semi-submersible barge 4.

[0048] Preferably, the floating platform 3 is a wind power foundation platform. The wind power foundation platform includes three columns arranged in a triangle, and two mooring cable connection mechanisms are provided on the outside of each column. The cables of the semi-submersible barge winch or the onshore winch can be connected to the connection mechanisms. Taking a certain working condition as an example: two mooring cable connection mechanisms are arranged at positions above the waterline on the outside of each column; a steel-concrete composite structure is locally used in the non-wind turbine side column and the lower floating body; the draft is about 7 m after launching.

[0049] Preferably, as Figure 2 shown, two semi-submersible barge winches arranged at intervals in the length direction of the semi-submersible barge 4 are connected to two connection mechanisms on the same column through the first cables 46, and there is an included angle between the two first cables 46; four first onshore winches are respectively connected to four connection mechanisms on two columns on the side of the floating platform 3 away from the semi-submersible barge 4 through the second cables 16, and there is an included angle between the two second cables 16 connected to the same column; the first cables 46 are retracted by the semi-submersible barge winch to provide forward power for the floating platform 3, and the four first onshore winches slowly release the ropes to control the direction and decelerate.

[0050] Further preferably, as Figure 3 shown, after the semi-submersible barge winch pulls the floating platform 3 to above the side of the semi-submersible barge 4 through the first cable 46, it is changed to be connected and pulled by the first onshore winch arranged on the side of the semi-submersible barge 4 away from the floating platform 3 to move the floating platform 3, so that the floating platform 3 can be located directly above the semi-submersible barge 4.

[0051] Taking a certain working condition as an example: after the floating platform 3 advances to directly above the semi-submersible barge 4, the semi-submersible barge 4 floats up and the floating platform 3 is seated on the pier; the semi-submersible barge 4 continues to float up until the deck 41 emerges 1 m above the water surface. At this time, the dock gate valve can be opened for drainage, and the semi-submersible barge drains water synchronously to the minimum draft; after the water levels inside and outside the dock are the same, the floating dock gate 12 starts to drain water and float up, and the floating dock gate 12 is winched to the dock gate storage area 13.

[0052] In some working conditions, in the first dock area 1, the semi-submersible barge winch and the onshore winch are used to rotate the semi-submersible barge 4 and the floating platform 3 together by 180°, so that the bow of the semi-submersible barge 4 faces the dock entrance 11.

[0053] In step S3, the semi-submersible barge 4 and the floating platform 3 are jointly winched out of the dock by using the semi-submersible barge winch and the onshore winch.

[0054] Preferably, connection members are provided on the semi-submersible barge 4, such as semi-submersible barge bollards, and onshore bollards are provided on the shore; the cables of the semi-submersible barge winch can be connected to the onshore bollards, and the cables of the onshore winch can be connected to the semi-submersible barge bollards. The semi-submersible barge winch and the onshore winch connected to the bow of the semi-submersible barge 4 retract the ropes to provide forward power, and the semi-submersible barge winch and the onshore winch connected to the stern of the semi-submersible barge 4 slowly release the ropes for attitude control.

[0055] Further preferably, in step S3, the number of semi-submersible barge winches is at least four, and the number of onshore winches is at least four. The semi-submersible barge winches and the semi-submersible barge bitts are distributed at the four corners of the semi-submersible barge 4, and there is an included angle between the cable ropes of the semi-submersible barge winches connected to the same corner of the semi-submersible barge 4 and the cable ropes of the onshore winches. The two cable ropes are in a figure-eight shape, as Figure 4 and Figure 5 shown.

[0056] Preferably, it further includes step S4: using the semi-submersible barge 4 to tow the floating platform 3 to the diving point for floating unloading.

[0057] Specifically, after the semi-submersible barge 4 and the floating platform 3 jointly leave the dry dock, the semi-submersible barge 4 and the tugboat form a formation, tow the floating platform 3 to the diving point, the semi-submersible barge 4 anchors and positions at the diving point. After positioning, it dives until the floating platform 3 completely floats. After floating, the semi-submersible barge winches and the tugboat winches cooperate with each other, and the tugboat is used to push and other methods to float and unload the floating platform 3; after the floating unloading is completed, the tugboat wet-tows the floating platform 3 back to the dock for berthing; thus, the launching work of the floating platform 3 is completed.

[0058] Further preferably, during floating unloading, the semi-submersible barge winches are connected to the floating platform 3 to control the direction of the floating platform 3 to prevent the floating platform 3 from colliding with the tower. The tugboat winches are also connected to the floating platform 3. Some tugboats tow the floating platform 3 to drift, and some other tugboats push the floating platform 3 to move the floating platform 3 away from above the semi-submersible barge 4 to complete the floating unloading.

[0059] Further preferably, it further includes step S5: floating and towing the floating platform 3 to the wind turbine unit installation dock for installing the wind turbine unit; the wind turbine unit installation dock can be selected as the dock close to the offshore wind power installation location.

[0060] When constructing an offshore floating wind turbine, the wind power foundation platform is built or assembled in the second dry dock area 2. After the wind power foundation platform is moved out of the deep and shallow dry docks, it is towed to the installation dock and then the wind turbine unit is installed. It can be understood that the wind turbine unit includes a tower barrel and a wind wheel arranged on the upper part of the tower barrel. The vertical dimensions of the tower barrel and the wind wheel are relatively high, the windward area is large, and the probability of instability is relatively large, and the requirements for long-distance towing are high; compared with the overall structure after installing the wind turbine unit, the wind power foundation platform has the advantages of low height and good stability, which can reduce the long-distance transportation cost and improve safety.

[0061] The floating platform launching and dry-docking construction method described in this embodiment utilizes deep and shallow dry docks for the construction or general assembly of the wind power foundation platform. Subsequently, the constructed wind power foundation platform is transferred to the installation dock near the offshore wind farm to install the wind turbine units. This can make full use of the existing conditions, better solve the problem of difficult production scheduling in large docks or large shipyards, while small docks or small marinas cannot meet the construction requirements. The wind power foundation platform has better overall structural stability compared to the overall structure after the wind turbine units are installed. The cost of long-distance towing is low and the safety is higher. It can achieve a large-scale production mode of deep and shallow dry dock general assembly + long-distance barge delivery + on-site hoisting of wind turbine units near the wind farm, which is conducive to cost reduction and construction period reduction.

[0062] Embodiment 2 As Figure 7 shown, this embodiment provides a floating platform launching and dry-docking construction method. Based on Embodiment 1, the difference from Embodiment 1 is that in step S2, the semi-submersible barge winch is connected to the shore cable bollard on the shore around the deep and shallow dry dock through the first cable 46. There are at least six first shore winches circumferentially arranged on the shore around the deep and shallow dry dock. The first shore winches are connected to the floating platform 3 through the second cable 16. The semi-submersible barge winch fixes the semi-submersible barge 4 by tensioning the first cable 46. Some of the first shore winches retract the second cable 16 to drag the floating platform 3 to move, and some of the other first shore winches slowly pay out the rope to control the direction and deceleration of the floating platform 3 until the floating platform 3 is located above the semi-submersible barge 4.

[0063] Preferably, the floating platform 3 is a wind power foundation platform. At least two connecting mechanisms for mooring cables are arranged on the outer side of each column of the wind power foundation platform. The second cable 16 is connected to the connecting mechanism. Each column is connected to at least two second cables 16, and there is an included angle between the two second cables 16 connecting the same column. The first shore winches can be arranged around the floating platform 3. Among them, the first shore winches located on the side of the floating platform 3 close to the semi-submersible barge 4 take in the rope to tow the floating platform 3 to move, and the first shore winches located on the side of the floating platform 3 far from the semi-submersible barge 4 slowly pay out the rope.

[0064] Embodiment 3 Those skilled in the art can understand that a conventional semi-submersible barge is provided with towers at its four corners. The towers are located at the four corners of the semi-submersible barge. When carrying a large floating platform 3, since the width of the floating platform 3 is greater than the width of the semi-submersible barge, the floating platform 3 needs to extend out of the side of the semi-submersible barge. To improve stability, the technicians hope to reduce the length of the floating platform 3 extending out of the semi-submersible barge, so the floating platform 3 needs to be placed as close as possible to the side of the semi-submersible barge. Whether it extends out of the side of the semi-submersible barge or is placed close to the side of the semi-submersible barge, there needs to be a sufficiently large placement space at the side position of the semi-submersible barge. However, the size of the towers of the conventional semi-submersible barge in the length direction of the semi-submersible barge is much larger than its own size in the width direction of the semi-submersible barge, resulting in a small distance between the bow and stern towers of the conventional semi-submersible barge, and not being able to provide enough placement space. Moreover, the bottom of the tower in the conventional semi-submersible barge is connected to the semi-submersible barge, and the engineering quantity for demolishing the tower is large. After the tower is demolished, the carrying capacity of the semi-submersible barge will be reduced.

[0065] To solve the above problems, this embodiment provides a special semi-submersible barge and a semi-submersible barge transformation method. In this embodiment, towers are provided at the four corners of the semi-submersible barge 4. Ballast water tanks can be arranged inside the towers to increase the buoyancy of the semi-submersible barge 4 and reduce the draft. A control room can be arranged on the upper part of the tower, and equipment such as a winch can be arranged on the top of the tower. The tower includes two first towers 42 and two second towers 43. The first tower 42 is located at the bow of the semi-submersible barge 4, and the second tower 43 is located at the stern of the semi-submersible barge 4. The second tower 43 is separately arranged from the deck 41 of the semi-submersible barge 4. By rotating at least one of the second towers 43, its size in the length direction of the semi-submersible barge 4 is made smaller than its own size in the width direction of the semi-submersible barge 4, so as to increase the distance between the two towers at the bow and stern on this side.

[0066] The rotation angle can be 80° - 100°, preferably 90°. The second tower 43 can be a floating box structure, and its lower part has a bottom plate. The deck 41 below the second tower 43 is also provided with a top plate.

[0067] Preferably, the second tower 43 includes at least two floating boxes arranged separately along the length direction of the semi-submersible barge 4. Define the two sides of the floating box in the width direction as the first side 4411 and the second side 4412 respectively. The floating box includes a lower section 442 and an upper section 441. The center of gravity of the upper section 441 is located on the second side 4412 of the center of gravity of the lower section 442, as Figure 16As shown; the lower section 442 and the upper section 441 are connected, and an arc transition structure can be provided at the junction of the two; before rotating the second tower 43, the first side 4411 and the second side 4412 of the floating box are arranged along the width direction of the semi-submersible barge 4. To increase the upper space of the second tower 43 under the condition of reducing the occupation of the deck 41 space, the upper section 441 protrudes from the second side 4412 of the lower section 442 so that the center of gravity of the upper section 441 is located on the second side 4412 of the center of gravity of the lower section 442. By providing a plurality of separated floating boxes and respectively moving and rotating each floating box, the difficulty of single movement and rotation can be reduced.

[0068] When rotating the second tower 43, each floating box is respectively rotated and moved to a specified position, and all the rotated floating boxes are arranged along the width direction of the semi-submersible barge 4, including the following steps: A1. A ballast 4413 is provided on the first side 4411 of the lower section 442 of the floating box. The ballast 4413 can be an iron block, a sandbag, a water bag, etc.; The floating box is lifted, and a sliding track is laid under the bottom plate of the floating box; The floating box is lowered onto the sliding track, and the floating box moves along the sliding track to the specified position; A2. The floating box is lifted, and the sliding track under the bottom plate of the floating box is removed; The floating box is lowered onto the deck 41.

[0069] In step A1, by providing a ballast 4413 on the first side 4411 of the lower section 442 of the floating box, the overall center of gravity of the floating box can be adjusted, and the probability of the floating box tipping over during the movement and rotation can be reduced. The ballast 4413 located in the lower section 442 can lower the center of gravity of the floating box to improve stability; in some working conditions, partial ballast water can also be injected into the floating box to lower the center of gravity of the floating box to improve stability, but this will increase the lifting difficulty.

[0070] In step A1, a hydraulic lifting mechanism 445 can be used to lift the floating box as a whole, leaving a laying space for the sliding track between the bottom plate of the floating box and the deck 41; preferably, roller cars 444 are provided on the sliding track. When the floating box is lowered onto the sliding track, the floating box falls onto the roller cars 444. The roller cars 444 can include two groups arranged at intervals, as Figure 20 shown, the two groups of roller cars 444 are respectively slidably engaged with two sliding tracks; the sliding track can include a front translation section 447, a rotation section 448, and a rear translation section 449. The front translation section 447 extends along the width direction of the semi-submersible barge 4, and the rear translation section 449 extends along the length direction of the semi-submersible barge 4; the floating box rotates on the rotation section 448. As Figures 17 to 19As shown, the front translation section 447 may include two straight tracks arranged at intervals. The floating box moves along the width direction of the semi-submersible barge 4 on the front translation section 447. The rotation section 448 may include two opposite arc tracks or a circular track. The floating box rotates integrally by 90° on the rotation section 448. The rear translation section 449 may include two straight tracks arranged at intervals. The floating box moves along the length direction of the semi-submersible barge 4 on the rear translation section 449.

[0071] In the preferred embodiment, by setting the front translation section 447, the rotation section 448 and the rear translation section 449 to perform the translation and rotation of the floating box respectively, it is beneficial to control the degrees of freedom during the movement of the floating box, thereby reducing the probability of the floating box losing stability and capsizing.

[0072] In step A1, the floating box can be pulled along the sliding track by a hydraulic cylinder. A protruding pulling plate 4410 may be provided on the side wall of the lower part of the floating box. The pulling plate 4410 is provided with a pin hole. One end of the hydraulic cylinder is provided with a connection hole, and the connection hole is aligned with the pin hole and connected by a pin.

[0073] Preferably, a fixed shaft plate may be provided between the side wall of the lower part of the floating box and the deck 41. One side of the fixed shaft plate is connected to the side wall of the floating box, and the other side is connected to the top surface of the deck 41, similar to a rib plate structure. A number of fixed shaft plates are circumferentially arranged on three sides of the floating box; before step A1, all the fixed shaft plates are removed, and after step A2, the fixed shaft plates are re-set between the floating box and the deck 41.

[0074] Preferably, as Figure 21 shown, lifting grooves 446 are provided at the lower parts of the four corners of the floating box. The lifting mechanism 445 is arranged between the bottom of the lifting groove 446 and the deck 41. The bottom of the lifting groove 446 is higher than the bottom surface of the floating box. The lifting mechanism 445 can be placed into the lifting groove 446 so that its upper end abuts against the bottom of the lifting groove 446 and its lower end abuts against the deck 41, and then the lifting mechanism 445 is extended to lift the floating box.

[0075] Preferably, a strengthening structure is provided in the cabin below the deck 41. The strengthening structure can be a vertical rib plate. The strengthening structure is arranged below the sliding track to improve the bearing capacity of the deck 41.

[0076] In some embodiments, a ventilation pipeline 443 is connected between the floating box and the semi-submersible barge 4. The ventilation pipeline 443 can be an iron round pipe. Part of the ventilation pipeline 443 is located in the lower cabin of the semi-submersible barge 4, and the other part is located inside the floating box; for the convenience of the movement of the floating box, in this embodiment, the ventilation pipeline 443 includes a first pipe section and a second pipe section which are separately arranged. One or more first pipe sections are located inside the semi-submersible barge 4, and one or more second pipe sections are located inside the floating box. The first pipe section and the second pipe section can be flange-connected.

[0077] In step A1, before lifting the pontoon, disconnect the first pipe section and the second pipe section, and the second pipe section moves with the pontoon.

[0078] The method further includes step A3: a connecting main pipe 49 is arranged on the semi-submersible barge 4, a plurality of first pipe sections are connected to the connecting main pipe 49, and a plurality of second pipe sections are connected to the connecting main pipe 49. Figure 15 As shown, the connecting main pipe 49 may be L-shaped, with one section located at the original position of the second tower 43 and the other section located at the moved position of the second tower 43 .

[0079] To facilitate connection, the end of the first pipe section can protrude from the deck 41, a pipeline groove can be set at the lower part of the pontoon, the end of the second pipe section protrudes from the bottom surface of the pipeline groove, the first pipe section and the second pipe section can be connected through a pipeline connector, the pipeline connector is flange-connected to the end of the first pipe section, and the pipeline connector is flange-connected to the end of the second pipe section.

[0080] In some embodiments, a cable, such as an electric cable, is connected between the pontoon and the semi-submersible barge 4. In step A1, before lifting the pontoon, the cable between the pontoon and the semi-submersible barge 4 is disconnected. After step A2, a watertight steel pipe is arranged between the original position of the second tower 43 and the position of the moved second tower 43, and the connecting cable is passed through the watertight steel pipe.

[0081] Taking this embodiment as an example, the second tower 43 includes a first pontoon 44 and a second pontoon 45 which are arranged and separated along the length direction of the semi-submersible barge 4. When the second tower 43 is rotated, the following steps are included: Move and rotate the first pontoon 44 to the first designated position according to steps A1-A2; move and rotate the second pontoon 45 to the second designated position according to steps A1-A2; the first pontoon 44 and the second pontoon 45 after being moved and rotated are arranged along the width direction of the semi-submersible barge 4.

[0082] Take a certain working condition as an example: in this working condition, the length of the modified semi-submersible barge 4 is 164m, the width is 65m, the depth is 10.2m, the maximum diving depth is 26.8m, the deck 41 has a uniformly distributed load of 25t / ㎡, the hull deck / bottom plate is made of 50mm thick steel plate, which has good rigidity and small hull deflection. At the same time, a deflection monitoring system is set up to monitor the hull deflection in real time.

[0083] The special semi-submersible barge described in this embodiment increases the distance between the bow and stern towers by rotating the second tower 43 at the stern of the semi-submersible barge 4, which has little impact on the center of gravity and buoyancy of the semi-submersible barge 4, and little impact on the stability of the semi-submersible barge 4. In addition, the changes in the auxiliary pipelines between the second tower 43 and the semi-submersible barge 4 after the movement are small, and the needs for placing a large floating platform 3 can be met while reducing the amount of engineering work and having less impact on stability.

[0084] In some embodiments, a steel box girder assembly 48 and a number of piers 47 are provided on the deck 41. The top surfaces of all the piers 47 are at the same height. The steel box girder assembly 48 is supported on the number of piers 47. The steel box girder assembly 48 includes at least one steel box girder, which has excellent vertical load-bearing capacity and flexural strength, and can meet the load-bearing requirements of large-mass components with only a relatively small height. The top surface of the steel box girder assembly 48 can form a placement surface for placing the floating platform 3. This placement surface is spaced from the deck 41, causing little obstruction to the passage of personnel and equipment on the deck 41 and requiring less removal of the existing facilities on the deck 41. The height of the steel box girder assembly 48 can be 0.9 m - 2 m; preferably 1 m - 1.5 m, and more preferably 1.2 m.

[0085] Preferably, as Figure 12 shown, the pier 47 is integrally in a portal shape, including two pier columns and a cross beam. There is a passage space below the cross beam. Tracks can be laid on the deck 41 and pass through the passage space. A transport vehicle travels on the tracks, and the transport vehicle can carry the pier 47 and move it along the tracks, thus facilitating the handling and changing of the position of the pier 47.

[0086] Preferably, the steel box girder assembly 48 protrudes from the side of the semi-submersible barge 4 to form an outboard suspended support system, which can be used to support the floating platform 3 with a width greater than that of the semi-submersible barge 4.

[0087] Preferably, the number of piers 47 is distributed in a triangular shape on the deck 41 to support a triangular wind power foundation platform, as Figure 9 and Figure 13 shown; several pier groups are arranged at intervals in the width direction of the deck 41. Each pier group includes several piers 47 arranged at intervals in the length direction of the deck 41; the door openings of all the piers 47 in the same pier group are aligned with each other, facilitating the straight passage of the tracks through the door openings. The door openings of the piers 47 are the above-mentioned passage spaces. The pier 47 can be a steel pier made of steel, and the height can be 2 m; sleepers are arranged on the top surface of the pier 47, and the sleepers are parallel to the length direction of the deck 41 and are erected on several adjacent piers 47.

[0088] Embodiment 4 This embodiment provides a method for moving and rotating a tower, including the following steps: 1. Seal the anchor on the anchor bracket, release the anchor cable connection, and recover the anchor chain; 2. Remove the connecting flange of the tower ventilation pipeline 443; 3. Remove the cable docking head; 4. Remove the Panama hole and the towing eye plate; 5. Remove the tower fixed shaft plate; 6. Use a hydraulic cylinder and place it in the jacking position; 7. The hydraulic cylinder jacks up the tower; 8. Translational section 447 and transverse roller trolley before laying; 9. Lower the jacking hydraulic cylinder, let the tower pier onto the transverse roller trolley, and arrange the pulling and closing hydraulic cylinder; 10. Arrange the ballast water belt, lower the center of gravity, and translate the position of the center of gravity; 11. Pull the anti-overturning cable; 12. The hydraulic pulling and closing cylinder pulls the tower to translate to the rotating position; 13. The hydraulic jacking cylinder jacks up the tower and withdraws the transverse moving roller trolley; 14. Place the rotating section 448 and the roller trolley, and connect the pulling and closing cylinders; 15. Lower and withdraw the jacking cylinder; 16. The tower rotates 90°; 17. The jacking hydraulic cylinder jacks up the tower and withdraws the rotating track; 18. Lay the post-translational section 449 and the roller trolley; 19. Withdraw the jacking hydraulic cylinder from jacking up the tower and move the tower to the designated position; 20. The jacking hydraulic cylinder jacks up the tower and withdraws the track and the roller trolley; 21. Weld the connecting shaft plate; 22. Recover the ballast water bag; 23. Connect and fix the shaft plate; 24. The vent pipelines 443 are collected into one path using steel boxes and extended to the position of the tower after rotation; 25. The ballast pipelines are connected using PE pipes along the deck; 26. The cables are extended along the deck to the position after rotation using watertight steel pipes.

[0089] Example 5 This example provides a construction method for launching and dry-docking a floating platform. On the basis of Example 1 or 2 or 3 or 4, under the working conditions of this example, the original dock width is less than the width of the floating platform 3. Before step S1, the dock 11 is widened so that the width of the dock 11 is greater than the width of the floating platform 3.

[0090] Preferably, it includes the following steps: A cofferdam 14 is set on the outside of the dock 11, and the cofferdam 14 isolates the deep and shallow docks from the external water area; Drain the water inside the cofferdam 14; Demolish the water retaining wall 15 and the water retaining structure on one side of the dock 11, and the water retaining structure includes artificial structures and / or mountains; Construct a new water retaining wall 15.

[0091] The dock entrance 11 can be widened to twice its original width, and two floating dock gates 12 can be used to cooperate with the widened dock entrance 11; mooring attachment points can be provided on the floating dock gates 12, and the winch of the semi-submersible barge can be connected to the mooring attachment points through cables to fix the position of the semi-submersible barge 4. The mooring attachment points can be located 2 meters above the water surface of the external water area.

[0092] Preferably, a two-way water stop structure is provided on the floating dock gate 12. When the water level inside the dock is higher than the water level of the external water area, the two-way water stop structure can prevent the water inside the dock from leaking out. When the water level inside the dock is lower than the water level of the external water area, the two-way water stop structure can prevent the water body of the external water area from leaking into the dock, so that the water level inside the dock can be higher or lower than the water level of the external water area.

[0093] The two-way water stop structure can include an inner gate plate provided on the inner side of the floating dock gate 12 and an outer gate plate provided on the outer side of the floating dock gate 12. Both the inner gate plate and the outer gate plate can be steel components. The inner gate plate is provided at the junction of the floating dock gate 12 and the water retaining wall 15 and at the junction between the two floating dock gates 12. The outer gate plate is provided at the junction of the floating dock gate 12 and the water retaining wall 15 and at the junction between the two floating dock gates 12. Under the action of water pressure, the inner gate plate and the outer gate plate are pressed against the floating dock gate 12 and the water retaining wall 15, thereby sealing the gaps between the floating dock gate 12 and the water retaining wall 15 and between the two floating dock gates 12.

[0094] Embodiment 6 As Figure 8 shown, this embodiment provides a construction method for launching and docking a floating platform. On the basis of Embodiment 1, the difference from Embodiment 5 is that: water retaining walls 15 are provided on both sides of the dock entrance 11, and the height of the top surface of the water retaining wall 15 above the water surface of the external water area is H1; the width of the semi-submersible barge 4 is smaller than the width of the dock entrance 11, and the width of the floating platform 3 is larger than the width of the dock entrance 11; in step S2, when the semi-submersible barge 4 floats: the semi-submersible barge 4 is floated until the bottom surface of the part of the floating platform 3 protruding from the semi-submersible barge 4 is higher than the water level inside the dock by a height of H2, and H2≥H1, as Figure 10 and Figure 11 shown.

[0095] In the construction method for launching and docking the floating platform described in this embodiment, the semi-submersible barge 4 is drained and floated to raise the floating platform 3, so that the bottom surface of the part of the floating platform 3 protruding from the semi-submersible barge 4 is higher than the water level inside the dock by a height of H2. When the inside and outside of the dock are connected, the bottom surface of the part of the floating platform 3 protruding from the semi-submersible barge 4 is higher than the top surface of the water retaining wall 15, so that the floating platform 3 with a width larger than the width of the dock entrance 11 can pass through the dock entrance 11; this embodiment provides a solution for large structures to pass through narrow dock entrances, can save the cost of widening the dock gate, and is applicable to working conditions with short construction periods.

[0096] In some working conditions, dock piers are provided on the top surface of the water retaining wall 15, and the dock piers can be cut in advance using a wire saw to reduce the height and reduce the obstruction to the passage of the floating platform 3.

[0097] Preferably, in step S2: the semi-submersible barge 4 floats until the height of the top surface of the deck 41 above the water surface in the dock is H3, where H3 ≥ H1; it can be understood that in most working conditions, the bottom surface of the floating platform 3 is higher than the deck 41, and the bottom surface of the part of the floating platform 3 protruding from the semi-submersible barge 4 is higher than the top surface of the deck 41, that is, H2 > H3 ≥ H1; the difference between H2 and H1 can be used as a safety margin, such as Figure 11 shown.

[0098] It can be understood that when the semi-submersible barge 4 is provided with the outboard suspended support system as described in Embodiment 3, H2 is replaced by the height of the bottom surface of the part of the steel box girder assembly 48 protruding from the semi-submersible barge 4 above the water surface in the dock, such as Figure 11 shown.

[0099] Embodiment 7 This embodiment provides a semi-submersible barge carrying system, including the special semi-submersible barge as described in Embodiment 3, and the floating platform 3 is located on the steel box girder assembly 48.

[0100] Preferably, the width of the floating platform 3 is greater than the width of the semi-submersible barge 4. The floating platform 3 includes three columns arranged in a triangular shape, and a lower floating body 34 is arranged between adjacent columns. The three columns are the first column 31, the second column 32, and the third column 33 respectively. This embodiment provides the following two layout methods: The first layout method: The first column 31 and the second column 32 are arranged at intervals along the length direction of the semi-submersible barge 4, and both are within the range of the deck 41. The third column 33 extends out of the side of the semi-submersible barge 4 completely or partially; as Figure 9 and Figure 10 shown. In this layout method, the first column 31 and the second column 32 are completely located on the deck 41, and the gravity of the first column 31 and the second column 32 can be directly transmitted to the deck 41. The third column 33 extends out of the side of the deck 41 completely or partially; this layout method is convenient for fixing the first column 31 and the second column 32 to improve the connection strength between the first column 31 and the second column 32, and at the same time, the first column 31 and the second column 32 jointly fix the third column 33. It can be understood that since the distance from the center of gravity of the wind power foundation platform to the lower floating body 34 between the first column 31 and the second column 32 is less than its distance to the third column 33, the above layout method can make the center of gravity of the wind power foundation platform close to the central axis of the semi-submersible barge 4, which is beneficial to the stability of the semi-submersible barge 4.

[0101] The second layout method: The first column 31 and the second column 32 are arranged at intervals along the length direction of the semi-submersible barge 4, and the first column 31, the second column 32, and the third column 33 all extend out of the side of the semi-submersible barge 4 partially; as Figure 13 and Figure 14As shown, this arrangement can reduce the overhanging length on the same side, which is beneficial to reducing the maximum bending moment of the cantilever part and alleviating its structural damage.

[0102] Preferably, the steel box girder assembly 48 includes three steel box girders connected in sequence from head to tail. The three steel box girders are respectively arranged corresponding to the three lower floating bodies 34, and the lower floating bodies 34 are supported on the top surfaces of the steel box girders.

[0103] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A construction method for launching and docking of a floating platform, characterized in that, It includes a connected first dock area (1) and second dock area (2), the bottom surface of the first dock area (1) is lower than the bottom surface of the second dock area (2), a semi-submersible barge (4) is located in the first dock area (1), and a floating platform (3) is located in the second dock area (2); It includes the following steps: Close the dock gate and fill the dock with water until the floating platform (3) floats; The semi-submersible barge (4) dives, so that the deck (41) of the semi-submersible barge (4) is lower than the bottom surface of the floating platform (3); Move the floating platform (3) above the semi-submersible barge (4); The semi-submersible barge (4) floats until the floating platform (3) sits on the deck (41); Open the dock gate and drive the semi-submersible barge (4) and the floating platform (3) to pass through the dock entrance (11) together.

2. The floating platform launching and dry-docking construction method according to claim 1, characterized in that The floating platform (3) is a wind power foundation platform, and the floating platform (3) includes three columns arranged in a triangle, and floating bodies are arranged between adjacent columns; It also includes the following steps: S4. Use the semi-submersible barge (4) to tow the floating platform (3) to the diving point for floating unloading; S5. Tow the floating platform (3) to the installation dock to install the wind turbine unit.

3. The floating platform launching and docking construction method according to claim 1, characterized in that, Two first towers (42) are provided at the bow of the semi-submersible barge (4), and two second towers (43) are provided at the stern of the semi-submersible barge (4); Before step S1, transform the semi-submersible barge (4): rotate at least one of the second towers (43) so that its dimension in the length direction of the semi-submersible barge (4) is smaller than its dimension in the width direction of the semi-submersible barge (4).

4. The floating platform launching and dry-docking construction method according to claim 3, characterized in that The second tower (43) includes at least two floating boxes arranged separately along the length direction of the semi-submersible barge (4). Define the two sides of the floating box in the width direction as the first side (4411) and the second side (4412) respectively. The floating box includes a lower section (442) and an upper section (441), and the center of gravity of the upper section (441) is located on the second side (4412) of the center of gravity of the lower section (442); When rotating the second tower (43), rotate and move each floating box to a specified position respectively. After rotation, all the floating boxes are arranged along the width direction of the semi-submersible barge (4), including the following steps: A1. Set a ballast (4413) on the first side (4411) of the lower section (442) of the floating box; Lift the floating box and lay a sliding track under the bottom plate of the floating box; Lower the floating box onto the sliding track, and the floating box moves along the sliding track to the specified position; A2. Lift the floating box and remove the sliding track under the bottom plate of the floating box; Lower the floating box onto the deck (41).

5. The floating platform launching and dry-docking construction method according to claim 4, characterized in that, A breather pipeline (443) is connected between the floating box and the semi-submersible barge (4). The breather pipeline (443) includes several first pipe sections arranged inside the semi-submersible barge (4) and several second pipe sections arranged inside the floating box. The first pipe sections and the second pipe sections are detachably connected; Before lifting the floating box in step A1: disconnect the first pipe section and the second pipe section; It further includes step A3: A connection main pipe (49) is arranged on the semi-submersible barge (4), and several of the first pipe sections are connected to the connection main pipe (49), and several of the second pipe sections are connected to the connection main pipe (49).

6. The floating platform launching and docking construction method according to claim 4, wherein: Lifting grooves (446) are provided at the lower parts of the four corners of the floating box, and lifting mechanisms (445) are arranged between the bottom of the lifting grooves (446) and the deck (41); And / or, the sliding track includes a front translation section (447), a rotation section (448) and a rear translation section (449). The front translation section (447) extends along the width direction of the semi-submersible barge (4), and the rear translation section (449) extends along the length direction of the semi-submersible barge (4); The floating box rotates on the rotation section (448).

7. The construction method for launching and dry-docking of the floating platform according to claim 1, characterized in that, Before step S1, the dock entrance (11) is widened so that the width of the dock entrance (11) is greater than the width of the floating platform (3); It includes the following steps: A cofferdam (14) is arranged outside the dock entrance (11), and the cofferdam (14) isolates the first dock area (1) from the external water area; Drain the water inside the cofferdam (14); Demolish the water retaining wall (15) and the water retaining structure on one side of the dock entrance (11), and the water retaining structure includes artificial structures and / or mountains; Construct a new water retaining wall (15).

8. The floating platform launching and docking construction method according to claim 1, characterized in that Water retaining walls (15) are provided on both sides of the dock entrance (11), and the height of the top surface of the water retaining wall (15) above the water surface of the external water area is H1; The width of the semi-submersible barge (4) is less than the width of the dock entrance (11), and the width of the floating platform (3) is greater than the width of the dock entrance (11); In step S2, when the semi-submersible barge (4) floats: The semi-submersible barge (4) floats until the bottom surface of the part where the floating platform (3) protrudes from the semi-submersible barge (4) is higher than the water surface in the dock by a height of H2, and H2≥H1.

9. The floating platform launching and docking construction method according to any one of claims 1-8, wherein: A semi-submersible barge winch is arranged on the semi-submersible barge (4), and shore winches are arranged on the shores around the first dock area (1) and the second dock area (2); In step S2, when moving the floating platform (3) above the semi-submersible barge (4): The semi-submersible barge winch is connected to one side of the floating platform (3) close to the semi-submersible barge (4) through a first cable (46) to tow the floating platform (3) towards the semi-submersible barge (4); The shore winch is connected to the side of the floating platform (3) away from the semi-submersible barge (4) through a second cable (16) to control the direction and deceleration of the floating platform (3); Semi-submersible barge winches and semi-submersible barge bollards are arranged at the four corners of the semi-submersible barge (4); Shore bollards are arranged on the shores around the first dock area (1) and the second dock area (2); When the semi-submersible barge (4) and the floating platform (3) are driven to pass through the dock entrance (11) together in step S3: the winch of the semi-submersible barge is connected to the onshore bollard through the first cable (46), and the onshore winch is connected to the bollard of the semi-submersible barge through the second cable (16), and there is an included angle between the first cable (46) and the second cable (16) connected to the same corner of the semi-submersible barge (4).

10. The method for launching and undocking the floating platform according to claim 2, wherein: The bottom surface of the first dock area (1) is lower than the water surface of the external water area, the bottom surface of the second dock area (2) is higher than the water surface of the external water area, and the dock entrance (11) communicates the first dock area (1) and the external water area; And / or, the dock gate is a floating dock gate (12). In step S1: move the floating dock gate (12) to the dock entrance (11) to close the dock gate; in step S3, move the floating dock gate (12) away from the dock entrance (11) to open the dock gate; And / or, in step S4, the floating unloading includes the following steps: the semi-submersible barge (4) dives until the floating platform (3) floats; move the floating platform (3) away from above the semi-submersible barge (4).

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