Method for ultra-wide structure to pass through narrow dock entrance, semi-submersible barge and semi-submersible barge carrying system

Abstract

The invention relates to the technical field of offshore wind power, in particular to a method for an ultra-wide structure to pass through a narrow dock entrance, a semi-submersible barge and a semi-submersible barge carrying system. Comprising the following steps that S1, the semi-submersible barge dives, and a deck of the semi-submersible barge is lower than the bottom face of a to-be-transported structure; s2, a to-be-transported structure is arranged above a deck; the semi-submersible barge floats until the bottom surface of the part, protruding out of the semi-submersible barge, of the to-be-transported structure is H2 higher than the water surface in the dock, H2 is larger than or equal to H1, and the to-be-transported structure is piled on the deck; and S3, driving the semi-submersible barge and the to-be-transported structure to pass through the dock entrance together. According to the method for enabling the ultra-wide structure to pass through the narrow dock entrance, the problem that a large-size, large-tonnage and complex structure passes through the narrow dock entrance can be solved, the method is suitable for the situation that a large structure is built in an existing dock building mode, the dock gate widening cost can be saved, or the remote towing cost of the large dock building from the distance is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and particularly relates to a method for an ultra-wide structure to pass through a narrow dock entrance, a semi-submersible barge and a semi-submersible barge carrying system. Background Art

[0002] At present, ocean development is moving towards deep and far-reaching sea areas. Traditional fixed structures can no longer meet the development needs of deep and far-reaching sea areas, and deep and far-reaching sea wind power has attracted more and more attention. The largest domestic offshore wind power is 16 MW class. Offshore wind power generally operates in deep and far-reaching sea areas, approximately in waters 70 nautical miles offshore. Wind turbines use the high-quality wind sources in deep and far-reaching seas to generate electricity. To improve the efficiency and stability of wind turbines, offshore wind power platforms are getting larger and larger. At present, a Y-shaped wind turbine foundation with a total length of about 130 meters, a width of about 120 meters, a height of 6 meters, and a self-weight of about 10,000 tons has been designed; and a Δ-shaped wind turbine foundation with a total length of about 100 meters, a width of about 100 meters, a height of 37 meters, and a self-weight of about 12,000 tons.

[0003] There are theoretically two ways to launch large offshore platforms, such as wind power platforms and oil platforms: one is to build them in onshore shipyards and use specific semi-submersible barges for floating transfer and launching at the dock. However, floating transfer at the dock has requirements for the elevation, width, and front water depth of the dock, and there are navigation problems in shallow-water docks; the other is to build them in a dry dock. After completion, the dock gate is opened to inject water, and the platform floats up and is towed out of the dry dock. Due to the long construction period of offshore platforms (about one and a half years), the number of ultra-large dry docks in China is small and they are far away. The shipping cost and the cost of occupying the large dry dock cycle are high, which will greatly increase the construction cost of offshore platforms.

[0004] Technical personnel analyzed the structural characteristics of most domestic construction docks and found that: the internal space of some domestic construction docks can meet the needs of the construction site for large offshore platforms, but the dock entrance is designed according to the dimensions of traditional wind power platforms or immersed tubes, and its width is smaller than the width of large platforms. That is to say, the above-mentioned large offshore platforms are "ultra-wide structures" relative to the existing "narrow dock entrance" and cannot pass through normally by floating. Moreover, widening the dock gate has limitations in terms of high cost and long cycle. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problem in the background art that large ultra-wide structures cannot pass through narrow dock entrances, resulting in the need to widen the dock entrance or transport them over long distances from other construction docks, which increases the construction cost, and provides a method for an ultra-wide structure to pass through a narrow dock entrance, a semi-submersible barge and a semi-submersible barge carrying system.

[0006] In the first aspect, the present invention provides a method for an ultra-wide structure to pass through a narrow dock entrance, including a dock entrance. The height of the top surface of the water retaining wall on one side of the dock entrance above the water surface of the external water area is H1, the dock is filled with water, and the structure to be transported floats on the water. It includes the following steps: S1. The semi-submersible barge submerges, making the deck of the semi-submersible barge lower than the bottom surface of the structure to be transported; S2. Set the structure to be transported above the deck; The semi-submersible barge floats until the bottom surface of the part of the structure to be transported protruding from the semi-submersible barge is higher than the water surface in the dock by a height of H2, H2≥H1, and the structure to be transported is seated on the deck; S3. Drive the semi-submersible barge and the structure to be transported to pass through the dock entrance together.

[0007] In the method for a super-wide structure to pass through a narrow dock entrance of the present invention, after the semi-submersible barge submerges, the structure to be transported is set above the deck, and the structure to be transported is lifted by draining water from the semi-submersible barge to float, so that the bottom surface of the part of the structure to be transported protruding from the semi-submersible barge is higher than the water surface in the dock by H2, H2≥H1. In the state where the dock is in communication with the outside water area, the bottom surface of the part of the structure to be transported protruding from the semi-submersible barge is higher than the top surface of the water retaining wall, thus creating conditions for the structure to be transported to pass through the dock entrance. The method for a super-wide structure to pass through a narrow dock entrance of the present invention can solve the problem of large-volume, large-tonnage, and complex structures passing through narrow dock entrances, is applicable to the situation of building large structures in existing construction docks, and is beneficial to saving the cost of widening dock gates or saving the cost of long-distance towing from a distant large construction dock.

[0008] Preferably, it includes a deep and shallow dock. The deep and shallow dock includes a connected deep dock area and a shallow dock area. The bottom surface of the deep dock area is lower than the water surface of the external water area, and the bottom surface of the shallow dock area is higher than the water surface of the external water area; the dock entrance communicates the deep dock area with the external water area, and the dock entrance is equipped with a floating dock gate; the semi-submersible barge is located in the deep dock area, and the structure to be transported is located in the shallow dock area.

[0009] Further preferably, in step S1, before the semi-submersible barge submerges: use the floating dock gate to close the dock entrance and fill the dock with water until the structure to be transported floats.

[0010] Further preferably, in step S3, before driving the semi-submersible barge and the structure to be transported to pass through the dock entrance together: drain part of the water body in the dock until the water surface in the dock is flush with the water surface of the external water area, and move the floating dock gate to make the dock entrance unobstructed.

[0011] Preferably, it includes a dry dock. In step S1, before the semi-submersible barge submerges: fill the dock with water until the water surface in the dock is flush with the water surface of the external water area, and the structure to be transported floats; open the dock gate, and the semi-submersible barge sails into the dock.

[0012] Further preferably, in step S2, the floating of the semi-submersible barge includes the following steps: the semi-submersible barge floats for the first time, making the structure to be transported seated on the deck; the semi-submersible barge floats for the second time, making the deck higher than the water surface in the dock by a height of H3, H3≥H1.

[0013] Preferably, a semi-submersible barge winch is provided on the semi-submersible barge, and several first shore winches are provided on the shore around the construction dock; connecting members are provided at the four corners of the semi-submersible barge, and at least four second shore winches are circumferentially provided on the shore around the construction dock; In step S2: The semi-submersible barge winch is connected to one side of the structure to be transported close to the semi-submersible barge through a first cable, for pulling the structure to be transported forward; the first shore winch is connected to the side of the structure to be transported far from the semi-submersible barge through a second cable, for controlling the direction and decelerating; The second shore winch is connected to the connecting members at the four corners of the semi-submersible barge respectively through a third cable to fix the semi-submersible barge.

[0014] In a second aspect, the present invention provides a semi-submersible barge for the method of passing an ultra-wide structure through a narrow dock entrance as described above, including several piers provided on the deck, and a steel box girder assembly provided on the top surfaces of the piers. The top surfaces of all the piers are at the same height, and the steel box girder assembly protrudes from the side of the deck.

[0015] For the semi-submersible barge of the present invention, by providing piers and a steel box girder assembly on the deck, an installation surface for placing the structure to be transported can be formed on the top surface of the steel box girder assembly, and this installation surface is spaced from the deck. When the structure to be transported is supported on the semi-submersible barge, the obstruction to the passage of personnel and equipment on the deck is small, and it is also less necessary to remove the inherent facilities on the deck. The steel box girder assembly protrudes from the side of the deck to form an outboard suspended support system, which can be used to carry an ultra-wide structure to be transported.

[0016] Preferably, four towers are circumferentially provided on the deck. The size of one of the towers in the length direction of the deck is smaller than its size in the width direction of the deck, and the sizes of the other three towers in the length direction of the deck are larger than their sizes in the width direction of the deck.

[0017] In a third aspect, the present invention provides a semi-submersible barge transportation system, including the semi-submersible barge as described above. The semi-submersible barge is used to transport the structure to be transported as described above, the width of the structure to be transported is greater than the width of the dock entrance, and the width of the semi-submersible barge is smaller than the width of the dock entrance.

[0018] Preferably, the structure to be transported is supported on the steel box girder assembly, and one side or both sides of the structure to be transported protrude from the side of the deck.

[0019] Preferably, the structure to be transported is a floating platform.

[0020] More preferably, the structure to be transported is a wind power foundation platform or an oil platform.

[0021] Preferably, the structure to be transported is a wind power foundation platform, which includes three columns arranged in a triangle and connectors disposed between adjacent columns. The three columns are the first column, the second column, and the third column respectively. The first column and the second column are located on one side of the deck and arranged at intervals along the length direction of the deck, and the third column is located on the other side of the deck, where: The vertical projections of the first column and the second column are within the vertical projection of the deck, and at least part of the vertical projection of the third column is outside the vertical projection of the deck; Or, the vertical projections of the first column, the second column, and the third column are all partially outside the vertical projection of the deck.

[0022] Preferably, the steel box girder assembly includes three steel box girders connected end to end in sequence and arranged in a triangle. The three steel box girders are respectively arranged corresponding to the three connectors, and the connectors are located on the top surfaces of the steel box girders.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. For the ultra-wide structure of the present invention, by the narrow dock gate method, after the semi-submersible barge submerges, the structure to be transported is arranged above the deck, and the structure to be transported is lifted by draining water and floating the semi-submersible barge, so that the bottom surface of the part of the structure to be transported protruding from the semi-submersible barge is higher than the water surface H2 in the dock, and H2≥H1. In the state where the dock is in communication with the outside, the bottom surface of the part of the structure to be transported protruding from the semi-submersible barge is higher than the top surface of the water retaining wall, thereby creating conditions for the structure to be transported to pass through the dock gate. The ultra-wide structure of the present invention can solve the problem of large-volume, large-tonnage, and complex-structure passing through a narrow dock gate by the narrow dock gate method, is applicable to the situation of building large structures in existing construction docks, is beneficial to saving the cost of widening the dock gate, or saving the cost of long-distance towing from a distant large construction dock.

[0024] 2. For the semi-submersible barge of the present invention, by arranging support piers and a steel box girder assembly on the deck, an installation surface for placing the structure to be transported can be formed on the top surface of the steel box girder assembly, and this installation surface is spaced from the deck. When the structure to be transported is supported on the semi-submersible barge, it has little obstruction to the passage of personnel and equipment on the deck, and it is also less necessary to remove the inherent facilities on the deck. The side of the steel box girder assembly protruding from the deck forms an outboard suspended support system, which can be used to carry the ultra-wide structure to be transported. Description of the Drawings

[0025] Figure 1 Schematic diagram of the ultra-wide structure passing through the narrow dock gate method described in Embodiment 2 Figure 1 ; Figure 2 Schematic diagram of the ultra-wide structure passing through the narrow dock gate method described in Embodiment 2 Figure 2 ; Figure 3Schematic of the ultra-wide structure described in Example 2 by the narrow dock method Figure 3 ; Figure 4 Schematic of the ultra-wide structure described in Example 2 by the narrow dock method Figure 4 ; Figure 5 Schematic of the ultra-wide structure described in Example 2 by the narrow dock method Figure 5 ; Figure 6 Schematic of the ultra-wide structure described in Example 2 by the narrow dock method Figure 6 ; Figure 7 Schematic diagram of the ultra-wide structure described in Example 4 by the narrow dock method; Figure 8 Planar schematic diagram of the first layout mode in Example 8; Figure 9 Front view of the first layout mode in Example 8; Figure 10 For Figure 9 Enlarged view of part A in Figure 11 For Figure 9 Enlarged view of part B in Figure 12 Planar schematic diagram of the second layout mode in Example 8; Figure 13 Front view of the second layout mode in Example 8; Figure 14 Planar layout schematic diagram of the tower described in Example 5; Figure 15 Front view of the tower described in Example 5; Figure 16 Planar schematic diagram of the floating box described in Example 5; Figure 17 Schematic diagram of the slip track layout described in Example 5 Figure 1 ; Figure 18 Schematic diagram of the slip track layout described in Example 5 Figure 2 ; Figure 19 Schematic diagram of the slip track layout described in Example 5 Figure 3 .

[0026] Markings in the figure: 1 - Dock entrance; 11 - Floating dock door; 12 - Dock door storage area; 13 - Water retaining wall; 2 - Semi-submersible barge; 21 - Deck; 22 - First Tower; 23 - Second Tower; 24 - Buoyancy Tank; 25 - Pier; 26 - Steel Box Girder Assembly; 27 - First Section; 28 - Second Section; 29 - Ballast; 210 - First Translation Section; 211 - Rotation Section; 212 - Second Translation Section; 213 - Roller Trolley; 214 - Jacking Mechanism; 3 - Structure to be Transported; 31 - First Column; 32 - Second Column; 33 - Third Column; 4 - Deep Dock Area; 5 - Shallow Dock Area; 6 - First Cable; 7 - Second Cable; 8 - Third Cable. Detailed Implementation Modes

[0027] 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. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0028] In the description of the specific embodiments of the present invention, without special explanation, the expression terms indicating the orientation or positional relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / equipment is usually used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, facilitating 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 positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0029] In addition, for terms such as "horizontal", "vertical", "hanging", "parallel", etc., it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it 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 it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the "horizontal", "vertical", "hanging", "parallel" and other directions, and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8% of the error / deviation, more preferably within ±6% of the error / deviation, more preferably within ±5% of the error / deviation, more preferably within ±4% of the error / deviation. 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.

[0030] In addition, the use of terms such as "first", "second", "third", etc. is merely for distinguishing the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0031] 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., or even more than 9.

[0032] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, when terms such as "set", "installed", "connected", "connected to", "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 connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This 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.

[0033] Embodiment 1 This embodiment provides a method for a super-wide structure to pass through a narrow dock entrance, including building a dock. The dock can be a shipyard, dry dock, etc. set on the coast. The dock is enclosed by a water retaining structure, which can be a natural mountain or an artificial structure. A dock entrance 1 is provided on the water retaining structure. The dock entrance 1 is used to connect the inside and outside of the dock. The dock entrance 1 is usually equipped with a dock gate, which can be opened or closed. When closed, the dock gate can seal the dock entrance 1 to isolate the inside and outside of the dock. At this time, the water level inside the dock can be higher than and / or lower than the water level of the external water area. When opened, the inside and outside of the dock are connected, and the external water area can enter from the dock entrance 1. At this time, the water level inside the dock is the same as the water level of the external water area; in order to enable the dock gate to seal the dock entrance 1, a water retaining wall 13 is provided on one or both sides of the dock entrance 1. The water retaining wall 13 can be formed by pouring concrete. A two-way water stop can be set between the dock gate and the water retaining wall 13 to prevent the water inside the dock from leaking out or the water outside the dock from leaking in.

[0034] The top surface of the water retaining wall 13 is higher than the water level of the external water area and the height difference is H1; the external water area can be seawater, river, lake, etc. Under the influence of tidal effects and other factors, the height of the water level of the external water area may fluctuate. In this embodiment, the water level of the external water area is preferably based on the average water level during the operation period; the operation period refers to the time period when the super-wide structure passes through the dock entrance 1. The structure to be transported 3 can be built or assembled in the dock. After completion, the width of the structure to be transported 3 is greater than the width of the dock entrance 1, making it impossible to float out of the dock normally; if the dock entrance 1 is widened, there are problems of high cost and long cycle. To solve the above problem of the structure to be transported getting out of the dock, the following method is provided: The dock is filled with water, and the structure to be transported 3 floats on the water, including the following steps: S1. The semi-submersible barge 2 submerges, making the deck 21 of the semi-submersible barge 2 lower than the bottom surface of the structure 3 to be transported. S2. Place the structure 3 to be transported above the deck 21. The semi-submersible barge 2 floats until the bottom surface of the part of the structure 3 to be transported protruding from the semi-submersible barge 2 is higher than the water surface in the dock and the height difference is H2, H2≥H1, and the structure 3 to be transported is seated on the deck 21. S3. Drive the semi-submersible barge 2 and the structure 3 to be transported through the dock entrance 1 together.

[0035] The semi-submersible barge 2 is also called a semi-submersible mother ship, on which there is a deck 21 for carrying goods. The semi-submersible barge 2 has a ballast water system and can adjust the draft height by injecting or discharging ballast water. In the deep draft state, the deck 21 can submerge below the water surface, and in the shallow draft state, the deck 21 can emerge above the water surface. The width of the semi-submersible barge 2 used in this embodiment is smaller than the width of the dock entrance 1, enabling it to pass through the dock entrance 1.

[0036] In step S2: The structure 3 to be transported or the semi-submersible barge 2 can be moved to make the structure 3 to be transported directly above the deck 21. At this time, there is a gap between the surface of the deck 21 and the bottom surface of the structure 3 to be transported. The semi-submersible barge 2 can float by draining water to contact the structure 3 to be transported and make the structure 3 to be transported seated on the deck 21, and further drain water to float up so that the bottom surface of the part of the structure 3 to be transported protruding from the semi-submersible barge 2 is higher than the water surface in the dock by a height of H2, H2≥H1.

[0037] Since the width of the structure 3 to be transported is greater than the width of the semi-submersible barge 2, the part of the structure 3 to be transported protruding from the semi-submersible barge 2 refers to the part where the structure 3 to be transported is seated on the deck 21 and extends out of the side of the semi-submersible barge 2 in the width direction of the semi-submersible barge 2. The semi-submersible barge 2 can reduce the draft by discharging ballast water to make the bottom surface of the structure 3 to be transported higher than the water surface in the dock by a height of H2, as Figure 10 shown; when the dock gate is opened to connect the inside and outside of the dock, the water surface in the dock is at the same height as the water surface in the external water area, that is, the bottom surface of the part of the structure 3 to be transported protruding from the semi-submersible barge 2 is higher than the top surface of the water retaining wall 13.

[0038] In step S3: The semi-submersible barge 2 and / or the structure 3 to be transported can be towed to make the two pass through the dock entrance 1 together. In the present embodiment, the ultra-wide structure adopts the narrow dock entrance method. After the semi-submersible barge 2 submerges, the structure 3 to be transported is arranged above the deck 21. The structure 3 to be transported is lifted by draining water from the semi-submersible barge 2 to make the bottom surface of the part of the structure 3 to be transported protruding from the semi-submersible barge 2 higher than the water surface in the dock by H2, where H2≥H1. In the state of connection between the inside and outside of the dock, the bottom surface of the part of the structure 3 to be transported protruding from the semi-submersible barge 2 is higher than the top surface of the water retaining wall 13, thus creating the condition for the structure 3 to be transported to pass through the dock entrance 1. The ultra-wide structure described in the present embodiment can solve the problem of large-volume, large-tonnage, and complex structures passing through a narrow dock entrance by the narrow dock entrance method, and is applicable to the situation of building large structures in existing construction docks, which is beneficial to saving the cost of widening the dock gate or saving the cost of long-distance towing from a large construction dock far away.

[0039] The structure 3 to be transported in the present embodiment may be a floating platform, such as a wind power foundation platform, an oil platform, etc. Taking the wind power foundation platform as an example: the structure 3 to be transported may be a Y-shaped wind power foundation platform or a Δ-shaped wind power foundation platform; taking the oil platform as an example: the structure 3 to be transported may be a rectangular oil platform.

[0040] Preferably, in step S2, the floating of the semi-submersible barge 2 includes the following steps: The semi-submersible barge 2 floats for the first time to make the structure 3 to be transported sit on the deck 21; The semi-submersible barge 2 floats for the second time to make the deck 21 higher than the water surface in the dock and the height difference is H3, where H3≥H1, as Figure 10 shown.

[0041] In this embodiment, it is preferred that the height H3 of the deck 21 above the water surface in the dock is ≥H1; in most transportation conditions, the bottom surface of the cantilever part of the structure 3 to be transported is higher than the deck 21, that is, H2>H3≥H1, and the difference between H2 and H1 can be used as a safety margin.

[0042] In some embodiments, several first shore winches are provided on the shore around the construction dock, and a semi-submersible barge winch is provided on the semi-submersible barge 2.

[0043] In step S2: Using a traffic boat or a heaving line, the cable of the semi-submersible barge winch is towed to the structure 3 to be transported for mooring, serving as the power and direction control cable; using the first shore winch to connect to the structure 3 to be transported for tailing, controlling the forward direction and deceleration of the structure 3 to be transported.

[0044] The semi-submersible barge winch is connected to one side of the structure 3 to be transported close to the semi-submersible barge 2 through the first cable 6 to provide forward power, and the first shore winch is connected to the side of the structure 3 to be transported far from the semi-submersible barge 2 through the second cable 7 to control the direction and deceleration.

[0045] Preferably, the structure to be transported 3 is a wind power foundation platform including three columns, and each column is provided with a connection mechanism for two mooring cables. Two semi-submersible barge winches are connected to the connection mechanism on the same column through a first cable 6 to provide forward power. Four first onshore winches are scattered on the side of the structure to be transported 3 away from the semi-submersible barge 2, and the first onshore winches are connected to the connection mechanisms on the other two columns through a second cable 7 to control the direction and decelerate.

[0046] Preferably, the structure to be transported 3 is an oil platform including four columns, and each column is provided with a connection mechanism for two mooring cables. Four semi-submersible barge winches are connected to the connection mechanisms on two columns through a first cable 6 to provide forward power. Four first onshore winches are scattered on the side of the structure to be transported 3 away from the semi-submersible barge 2, and the first onshore winches are connected to the connection mechanisms on the other two columns through a second cable 7 to control the direction and decelerate.

[0047] Further preferably, there is an angle between the two first cables 6 connected to the same column, and they are in a V shape; there is an angle between the two second cables 7 connected to the same column, and they are in a V shape.

[0048] After the structure to be transported 3 moves above the semi-submersible barge 2, it is then towed by the first onshore winch arranged on the side of the semi-submersible barge 2 away from the structure to be transported 3 through the second cable 7 to move to directly above the semi-submersible barge 2, as Figure 3 shown.

[0049] Preferably, connection members are provided at the four corners of the semi-submersible barge 2, and the connection members can be buckles, bollards, etc.; at least four second onshore winches are arranged circumferentially on the shore around the construction dock, and the second onshore winches are respectively connected to the connection members at the four corners of the semi-submersible barge 2 through a third cable 8 to fix the semi-submersible barge 2.

[0050] As Figure 1 and Figure 2 shown, the connection members are respectively connected to the corresponding second onshore winches, and the position of the semi-submersible barge 2 can be maintained stable by tensioning the third cable 8.

[0051] In some embodiments, it further includes step S4: after the semi-submersible barge 2 and the structure to be transported 3 jointly pass through the dock entrance 1, the semi-submersible barge 2 and the tugboat form a formation to barge the structure to be transported 3 to the submerging point for floating unloading.

[0052] The floating unloading includes the following steps: The semi-submersible barge 2 anchors and positions at the submerging point. After positioning, it submerges until the structure to be transported 3 is completely floating; After floating, the semi-submersible barge winches of the semi-submersible barge 2 and the tugboat winches cooperate, and the structure to be transported 3 is moved away from above the semi-submersible barge 2 by means of the tugboat pushing, etc.

[0053] After the floating discharge is completed, the tugboat will wet-tow the structure to be transported 3 back to the dock for berthing; thus, the launching work of the structure to be transported 3 is completed.

[0054] Embodiment 2 As Figures 1 to 6 shown, this embodiment provides a method for a super-wide structure to pass through a narrow dock entrance. On the basis of Embodiment 1, the dock is a deep and shallow dock, and the deep and shallow dock includes a connected deep dock area 4 and a shallow dock area 5. The bottom surface of the deep dock area 4 is lower than the water surface of the external water area, and the bottom surface of the shallow dock area 5 is higher than the water surface of the external water area; the dock entrance 1 communicates with the deep dock area 4 and the external water area, and the dock gate matching the dock entrance 1 is a floating dock gate 11. The deep and shallow dock can have the following working conditions: Passing working condition: The dock gate is opened, the dock entrance 1 is in an unobstructed state, the water surface of the deep dock area 4 is at the same height as the water surface of the external water area, the semi-submersible barge 2 can pass between the deep dock area 4 and the external water area, and the structure to be transported 3 can be built or assembled in the shallow dock area 5.

[0055] High water level working condition: The dock gate is closed, the dock entrance 1 is in a closed state, the water surfaces of the deep dock area 4 and the shallow dock area 5 are higher than the water surface of the external water area, and the structure to be transported 3 can float in the shallow dock area 5.

[0056] Preferably, it also has a low water level working condition: The dock gate is closed, the dock entrance 1 is in a closed state, the water surface of the deep dock area 4 is lower than the water surface of the external water area, and even the bottom surface of the deep dock area 4 is exposed.

[0057] The floating dock gate 11 is a dock gate structure with a floating function, and a ballast water tank can be arranged inside it. It can achieve sitting on the bottom or floating by injecting or discharging ballast water. In the floating state, the floating dock gate 11 can move. When the floating dock gate 11 moves to the dock entrance 1, it can close the dock entrance 1 by sitting on the bottom; preferably, there is also a dock gate storage area 12 for storing the floating dock gate 11, and the floating dock gate 11 can be placed in the dock gate storage area 12 after moving away from the dock entrance 1.

[0058] This embodiment provides the following method for passing through a narrow dock entrance: A1. The semi-submersible barge 2 sails into the deep dock area 4, uses the floating dock gate 11 to close the dock entrance 1, and injects water into the dock until the structure to be transported 3 floats. At this time, the water surface in the dock is higher than the water surface of the external water area; The semi-submersible barge 2 dives, so that the deck 21 of the semi-submersible barge 2 is lower than the bottom surface of the structure to be transported 3; A2. Place the structure to be transported 3 above the deck 21; The semi-submersible barge 2 floats until the bottom surface of the part of the structure to be transported 3 protruding from the semi-submersible barge 2 is higher than the water surface in the dock and the height difference is H2, H2≥H1, and the structure to be transported 3 sits on the pier on the deck 21; A3. Drain part of the water body in the dock until the water surface in the dock is flush with the water surface of the external water area, and move the floating dock gate 11 to make the dock entrance 1 unobstructed; Drive the semi-submersible barge 2 and the structure to be transported 3 to pass through the dock entrance 1 together.

[0059] Taking a certain actual working condition as an example, the structure 3 to be transported in this working condition is a wind power foundation platform including three columns: In step A1: Use the pump in the pump house to fill the dock with water. When the water level in the dock reaches +11.2 m, the wind power foundation platform floats up 1 m; the semi-submersible barge 2 dives synchronously until the draft of the semi-submersible barge 2 is 22 m.

[0060] In step A2: Use a traffic boat or a heaving line to tow the first cable 6 of the semi-submersible barge winch to the structure 3 to be transported and make it fast, which serves as the power and direction control cable for the operation; Use the onshore winch for tailing control to control the forward direction and deceleration of the wind power foundation platform; After the wind power foundation platform advances to the designated position of the semi-submersible barge 2, the semi-submersible barge 2 floats up, the wind power foundation platform is seated on the pier, and the semi-submersible barge 2 continues to float up until the deck 21 emerges 1 m above the water surface.

[0061] In step A3: Open the valve of the dock entrance 1 for drainage, and the semi-submersible barge 2 drains water synchronously to the minimum draft; After the water surface in the dock is at the same elevation as the water surface of the external water area, the floating dock gate 11 starts to drain water and float up, and the floating dock gate 11 is winched and moved to the dock gate storage area 12; Use the onshore winch and the semi-submersible barge winch to tow and move the semi-submersible barge 2 and the structure 3 to be transported until they pass through the dock entrance 1.

[0062] In some working conditions, before driving the semi-submersible barge 2 and the structure 3 to be transported to pass through the dock entrance 1 together, use the onshore winch and the semi-submersible barge winch to rotate the semi-submersible barge 2 and the structure 3 to be transported together by 180°, so that the bow of the semi-submersible barge 2 faces the dock entrance 1.

[0063] In some working conditions, dock piers are provided on the top surfaces of the retaining walls 13 on both sides of the dock entrance 1. The dock piers can be cut by a wire saw and the cut dock piers can be hoisted ashore to reduce the height and reduce the obstruction to the wind power foundation platform.

[0064] Embodiment 3 This embodiment provides a method for a super-wide structure to pass through a narrow dock entrance. On the basis of Embodiment 1, the difference from Embodiment 2 is that the constructed dock is a dry dock, the bottom surface of the dry dock is lower than the water surface of the external water area, and the height of the top surface of the retaining walls 13 on both sides of the dock entrance 1 above the water surface of the external water area is H1.

[0065] Under normal circumstances, the dock gate closes the dock entrance 1, and the dry dock is in a non-flooded state, and the structure 3 to be built or assembled can be built or assembled in the dry dock; In the shipping condition, the dock entrance 1 is unobstructed, and the water surface in the dock is flush with the water surface of the external water area.

[0066] This embodiment provides the following method for passing through a narrow dock entrance: B1. Inject water into the dock until the water surface in the dock is flush with the water surface of the external water area, and the structure 3 to be transported floats up; Open the dock gate, and the semi-submersible barge 2 sails into the dock; The semi-submersible barge 2 submerges, causing the deck 21 to be lower than the bottom surface of the structure 3 to be transported. B2. Place the structure 3 to be transported above the deck 21. The semi-submersible barge 2 floats until the bottom surface of the protruding part of the structure 3 to be transported above the semi-submersible barge 2 is higher than the water surface in the dock and the height difference is H2, where H2≥H1, and the structure 3 to be transported is seated on the deck 21. B3. Drive the semi-submersible barge 2 and the structure 3 to be transported through the dock entrance 1 together.

[0067] In step B1, the semi-submersible barge 2 can either submerge after driving into the dock or drive into the dock after submerging.

[0068] Embodiment 4 As Figure 7 shown, this embodiment provides a method for a super-wide structure to pass through a narrow dock entrance. Based on Embodiment 1, the difference from Embodiment 1 is that: a semi-submersible barge winch is provided on the semi-submersible barge 2, a first shore winch and a shore bollard are provided on the shore around the construction dock. In step S2: the semi-submersible barge winch is connected to the shore bollard through the first cable 6 to fix the semi-submersible barge 2, and the first shore winch is connected to the structure 3 to be transported through the second cable 7. Among them, some of the first shore winches take in the rope to provide the forward power, and some of the other first shore winches slowly pay out the rope to control the direction and decelerate until the structure 3 to be transported is moved above the deck 21.

[0069] Preferably, the number of semi-submersible barge winches is four and they are distributed at the four corners of the semi-submersible barge 2. There are several shore bollards on the shore. The semi-submersible barge winches are connected to the shore bollards corresponding to the four corners of the semi-submersible barge 2 through the first cable 6, and the position of the semi-submersible barge 2 is maintained stable by tensioning the first cable 6; the first shore winches can be arranged around the structure 3 to be transported. Among them: the first shore winches located on the side of the structure 3 close to the semi-submersible barge 2 take in the rope to pull the structure 3 to be transported to move, and the first shore winches located on the side of the structure 3 far from the semi-submersible barge 2 slowly pay out the rope.

[0070] Preferably, the structure 3 to be transported is a wind power foundation platform including three columns. Each column is provided with two connection mechanisms for mooring cables. At least six first shore winches are arranged around the structure 3 to be transported. The first shore winches are connected to the connection mechanisms through the second cable 7, and there is an included angle between the two second cables 7 connected to the same column, and they are in a figure-eight shape.

[0071] Preferably, the structure 3 to be transported is an oil platform including four columns. Each column is provided with two connection mechanisms for mooring cables. At least eight first shore winches are arranged around the structure 3 to be transported. The first shore winches are connected to the connection mechanisms through the second cable 7, and there is an included angle between the two second cables 7 connected to the same column, and they are in a figure-eight shape.

[0072] The connecting mechanism can be a connecting buckle, a locking buckle, etc., which is used to connect with the cable; the shore cable pile is a component used to connect with the cable, which can be a column protruding from the ground, or a ring-shaped structure set on the ground, and the cable passes through the ring-shaped structure and is tied and connected.

[0073] Example 5 The present embodiment provides a special semi-submersible barge, which is used for the method of passing the ultra-wide structure through the narrow dock as described in Example 1, 2, 3 or 4, including a plurality of piers 25 arranged on the deck 21, and a steel box girder assembly 26 arranged on the top surface of the piers 25. The top surfaces of all the piers 25 are located at the same height, and the steel box girder assembly 26 protrudes from the side of the deck 21.

[0074] The semi-submersible barge described in this embodiment is provided with piers 25 and steel box girder assemblies 26 on the deck 21. The top surface of the steel box girder assembly 26 can form a placement surface for placing the structure 3 to be transported, and the placement surface is spaced apart from the deck 21. When the structure 3 to be transported is supported on the semi-submersible barge, there is little obstruction to the passage of personnel and equipment on the deck 21, and there is less need to dismantle the inherent facilities on the deck 21. The steel box girder assembly 26 protrudes from the side of the deck to form an outboard suspended support system, which can be used to carry the extra-wide structure 3 to be transported.

[0075] Preferably, the pier 25 includes two pier columns and a crossbeam connecting the two pier columns, and there is a passage space under the crossbeam to facilitate the setting of tracks and transport vehicles for the installation and position adjustment of the pier 25.

[0076] Preferably, the buttresses 25 are arranged in rows on the deck 21, such as Figure 8 and Figure 12 As shown, several pier groups are arranged at intervals along the width direction of the deck 21, and each pier group includes several piers 25 arranged at intervals along the length direction of the deck 21; the door openings of all piers 25 in the same pier group are aligned with each other to facilitate the track to pass straight through the door opening, and the door opening of the pier 25 is the above-mentioned passage space.

[0077] Further preferably, the cross beams of all the piers 25 are parallel to the width direction of the deck 21 .

[0078] Further preferably, a track is provided under the pier 25 , a trolley can travel on the track, a lifting seat is provided on the trolley, and the lifting seat can be vertically extended and retracted to lift up or lower the pier 25 , so as to facilitate the arrangement and position adjustment of the pier 25 .

[0079] The pier 25 can be a steel pier made of steel and can be 2 meters high. Sleepers are arranged on the top surface of the pier 25 , and the sleepers are parallel to the length direction of the deck 21 , and the sleepers are erected on several adjacent piers 25 .

[0080] The steel box girder assembly 26 includes a number of steel box girders. The steel box girders have excellent vertical load-bearing capacity and flexural strength, and only a relatively small height is required to meet the load-bearing needs of large-mass components. The top surface of the steel box girder forms a placement surface for the structure 3 to be transported. The steel box girder assembly 26 protrudes from the side of the deck 21 to form an outboard suspended support system for bearing the part of the structure 3 to be transported that extends out of the deck 21. When using the above outboard suspended support system, H2 is replaced by the height of the bottom surface of the part of the steel box girder assembly 26 protruding from the semi-submersible barge 2 above the water surface in the dock, as Figure 10 shown.

[0081] The height of the steel box girder assembly 26 can be 0.9 m - 2 m; preferably 1 m - 1.5 m, and more preferably 1.2 m.

[0082] In some embodiments, there are four towers on the semi-submersible barge 2. The four towers are distributed at the four corners of the semi-submersible barge 2. Two of the four towers are the first towers 22, and the other two are the second towers 23. The first tower 22 is located at the bow of the semi-submersible barge 2, and the second tower 23 is located at the stern of the semi-submersible barge 2. The bow and the stern are respectively located at the two ends of the length direction of the semi-submersible barge 2; the size of at least one second tower 23 in the length direction of the semi-submersible barge 2 is smaller than its size in the width direction of the semi-submersible barge 2, as Figure 14 shown.

[0083] Those skilled in the art can understand that in order to make the structure 3 to be transported more stable, it is necessary to reduce the size of the structure 3 protruding from the semi-submersible barge 2, that is, to make the structure 3 lean against the side of the deck 21; the size of each of the four towers of the existing semi-submersible barge in the length direction of the semi-submersible barge is larger than its size in the width direction of the semi-submersible barge, resulting in a small distance between the two towers on the same side and not providing enough space for the placement of the structure 3 to be transported.

[0084] If one of the towers is directly removed, it will have a greater impact on the stability of the semi-submersible barge 2, and there are pipelines such as breather pipes and cables connected between the tower and the lower hull of the semi-submersible barge 2. Removing the tower requires overall relocation of the pipelines, and the engineering quantity is very large. For this reason, in this embodiment, one of the second towers 23 is rotated 90° as a whole so that its size in the length direction of the semi-submersible barge 2 is smaller than its size in the width direction of the semi-submersible barge 2, to increase the distance between the bow and stern towers, and a space for placing the structure 3 to be transported can be formed without significantly reducing the stability of the semi-submersible barge 2, with little impact on the floating attitude of the semi-submersible barge 2, and only local movement of the pipelines between the structure 3 to be transported and the lower hull is required, and the engineering quantity is relatively small.

[0085] In some embodiments, the same second tower 23 includes at least two pontoons 24 arranged along the length direction of the deck 21. The pontoons 24 are of an integral structure, and pipelines are connected between the pontoons 24 and the semi-submersible barge 2. When rotating the second tower 23, each pontoon 24 is respectively moved to a designated position so that the moved pontoons 24 are arranged along the width direction of the deck 21. When moving the pontoons 24, the following steps are included: C1. Jack up the pontoon 24 and lay a sliding track under the bottom plate of the pontoon 24; Lower the pontoon 24 onto the sliding track, and the pontoon 24 moves along the sliding track to the designated position; C2. Jack up the pontoon 24 and take out the sliding track under the bottom plate of the pontoon 24; Lower the pontoon 24 onto the deck 21.

[0086] Preferably, the pontoon 24 includes a first section 27 and a second section 28 arranged up and down. The second section 28 is located above the first section 27, and the center of gravity of the second section 28 is on the first side of the center of gravity of the first section 27, as Figure 15 shown; before jacking up the pontoon 24 in step C1, a ballast 29 is arranged on the second side of the first section 27 of the pontoon 24 to level the center of gravity of the pontoon 24. The first side and the second side are opposite to each other, and the ballast 29 can be an iron block, a sandbag, a water bag, etc.

[0087] Preferably, the sliding track includes a first translation section 210, a rotating section 211 and a second translation section 212. The first translation section 210 is parallel to the width direction of the deck 21, the second translation section 212 is parallel to the length direction of the deck 21, and the rotating section 211 can be an annular track. The pontoon 24 rotates on the rotating section 211; the first translation section 210, the rotating section 211 and the second translation section 212 are sequentially arranged under the pontoon 24, and the following steps are included: Jack up the pontoon 24 and lay the first translation section 210 under the bottom plate of the pontoon 24; lower the pontoon 24 onto the first translation section 210, and the pontoon 24 moves along the first translation section 210 to the first position; Jack up the pontoon 24, take out the first translation section 210 under the bottom plate of the pontoon 24; lay the rotating section 211 under the bottom plate of the pontoon 24; lower the pontoon 24 onto the rotating section 211, and the pontoon 24 rotates 90° along the rotating section 211; Jack up the pontoon 24, take out the rotating section 211 under the bottom plate of the pontoon 24; lay the second translation section 212 under the bottom plate of the pontoon 24; lower the pontoon 24 onto the second translation section 212, and the pontoon 24 moves along the second translation section 212 to the second position; Jack up the pontoon 24, take out the second translation section 212 under the bottom plate of the pontoon 24; lower the pontoon 24 onto the deck 21.

[0088] Preferably, before step C1, the auxiliary pipelines between the buoy 24 and the semi-submersible barge 2 are cut off, such as ballast pipes, vent pipes, fire pipes, fresh water pipes, etc., and the auxiliary cables such as power cables, communication cables, etc. After step C2, the auxiliary pipelines between the buoy 24 and the semi-submersible barge 2 are reconnected.

[0089] For the auxiliary pipelines: a detachable connection between the first pipe section and the second pipe section can be provided, for example, a flange connection is adopted, the first pipe section is located in the semi-submersible barge 2, and the second pipe section is located in the pontoon 24. The first pipe section and the second pipe section are disconnected before step C1, and after step C2, a connecting main pipe can be provided between the original tower position and the tower position after the move, the first pipe section is connected to the connecting main pipe, and the second pipe section is connected to the connecting main pipe.

[0090] For the auxiliary cables: before step C1, the auxiliary cables between the semi-submersible barge 2 and the pontoon 24 are disconnected, and after step C2, a watertight steel pipe can be used to extend the auxiliary cables through the deck 21 to the moved position, and the auxiliary cables are inserted into the watertight steel pipe.

[0091] Preferably, a roller trolley 213 is provided on the sliding track. When the buoyancy box 24 is lowered onto the sliding track, the buoyancy box 24 is lowered onto the roller trolley 213, so that it moves on the sliding track through the roller trolley 213; further preferably, the roller trolley 213 includes two groups arranged at intervals, and the sliding track also includes two groups arranged at intervals, and the two groups of roller trolleys 213 cooperate with the two sliding tracks respectively; for the rotating section 211, a plurality of roller trolleys 213 in the same group are arranged in an arc shape, such as Figures 16 to 19 shown.

[0092] Preferably, a lifting groove is provided at the bottom of the buoyancy box 24, and the bottom surface of the lifting groove is opposite to the deck 21. The lifting mechanism 214 is arranged in the lifting groove and one end of it is connected to the bottom surface of the lifting groove, and the other end is connected to the deck 21. The lifting mechanism 214 lifts the buoyancy box 24 by extending; the lifting mechanism 214 can be a cylinder or the like.

[0093] The jacking mechanism 214 is preferably arranged on the longitudinal girder or at the intersection of the longitudinal and transverse girders. A base is provided under each jacking mechanism 214 to increase the stress area. The jacking mechanism 214 can be jacked against the frame of the floating box 24 or the strengthening member. Start the jacking hydraulic pump station to drive all the jacking mechanisms 214 to jack simultaneously. During the jacking process, use wooden pads or wooden piers for multi-point protection to ensure the safety and reliability of the floating box 24 during jacking and avoid accidents. During the synchronous jacking of the floating box 24, it is recommended to continuously add protective wooden pads with equal thickness. Always ensure that the distance between the bottom plane of the floating box 24 and the wooden pads is less than the thickness of one wooden pad to ensure its effective protective and supporting effect on the floating box 24, prevent the floating box 24 from settling or slipping during operation, and it is not an essential part of this set of devices. The jacking mechanism 214 jacks the floating box 24 simultaneously until the distance from the deck 21 to the bottom surface of the floating box 24 is sufficient to insert the guide rail and the heavy-duty roller trolley 213.

[0094] The tower rotation solution provided in this embodiment, by arranging at least two integral floating boxes 24, the floating boxes 24 are separated from the deck 21, facilitating the movement of the floating boxes 24 through jacking. The weight of a single floating box 24 is lighter than the whole of the second tower 23, which can reduce the difficulty of movement; by arranging the first translation section 210, the rotation section 211 and the second translation section 212 to translate and rotate the floating box 24 respectively, it is convenient to control the degrees of freedom during the movement process, which is conducive to reducing the movement difficulty and improving the safety.

[0095] Embodiment 6 This embodiment provides a method for moving a tower, including the following steps: 1. Fix the anchor on the anchor bracket, release the anchor cable connection, and retrieve the anchor chain; 2. Remove the connecting flange of the tower's auxiliary pipeline; 3. Remove the docking head of the tower's auxiliary cable; 4. Remove the Panama hole and the towing eye plate; 5. Remove the tower's fixed shaft plate; 6. Place the hydraulic cylinder at the jacking position; 7. The hydraulic cylinder jacks up the tower; 8. Lay the first translation section 210 and the transverse roller trolley; 9. Lower the jacking hydraulic cylinder, and the tower lands on the transverse roller trolley, and arrange the pulling hydraulic cylinder; 10. Arrange the ballast water belt, lower the center of gravity, and translate the center of gravity position; 11. Pull the anti-overturning cable; 12. The hydraulic pulling cylinder pulls the tower to move horizontally to the rotation position; 13. The hydraulic jacking cylinder jacks up the tower, and withdraws the horizontal moving roller trolley; 14. Place the rotation section 211 and the rotation roller trolley, and connect the pulling cylinder; 15. The jacking cylinder descends and retracts; 16. The tower rotates 90°; 17. The jacking hydraulic cylinder jacks up the tower and retracts from the rotating track; 18. Lay the second translation section 212 and the roller car; 19. Retract the jacking hydraulic cylinder that jacks up the tower and move the tower to the designated position; 20. The jacking hydraulic cylinder jacks up the tower and retracts 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 auxiliary pipelines are collected into one route using steel boxes and extended to the position of the rotated tower; 25. The ballast pipelines are connected using PE pipes along the deck; 26. The cables are extended to the rotated position along the deck using watertight steel pipes.

[0096] Embodiment 7 This embodiment provides a semi-submersible barge transportation system, including the special semi-submersible barge described in Embodiment 5. The semi-submersible barge 2 is used to transport the structure to be transported 3 described in Embodiment 1 or 2 or 3 or 4.

[0097] The width of the structure to be transported 3 is greater than the width of the dock entrance 1, and the width of the semi-submersible barge 2 is less than the width of the dock entrance 1. The structure to be transported 3 is supported on the steel box girder assembly 26, and one or both sides of the structure to be transported 3 protrude beyond the side of the deck 21.

[0098] Preferably, the structure to be transported 3 is a floating platform; More preferably, the structure to be transported 3 is a wind power foundation platform or an oil platform.

[0099] Embodiment 8 This embodiment provides a semi-submersible barge transportation system. On the basis of Embodiment 7, the structure to be transported 3 is a Δ-shaped wind power foundation platform. The Δ-shaped wind power foundation platform includes a first column 31, a second column 32, and a third column 33 arranged in a triangle. There is a connecting body between adjacent columns, and the connecting body can be a floating body that can float on the water surface; the first column 31 and the second column 32 are arranged at intervals along the length direction of the deck 21, that is, the connection line between the first column 31 and the second column 32 is parallel to the length direction of the deck 21.

[0100] This embodiment also provides two demonstration layout methods: One: The vertical projections of the first column 31 and the second column 32 are located within the deck 21, and at least part of the vertical projection of the third column 33 is located outside the deck 21.

[0101] Such as Figures 8 to 11As shown, in this arrangement, the first column 31 and the second column 32 are completely above the deck 21. The gravity of the first column 31 and the second column 32 can be directly transmitted to the deck 21, while the third column 33 completely extends or partially extends out of the side of the deck 21. This arrangement facilitates the fixation of the first column 31 and the second column 32 to improve their support strength. 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 connecting body between the first column 31 and the second column 32 is less than its distance to the third column 33, the above arrangement can make the center of gravity of the wind power foundation platform close to the central axis of the semi-submersible barge 2, which is beneficial to the stability of the semi-submersible barge 2.

[0102] Second: The vertical projections of the first column 31, the second column 32, and the third column 33 are all partially outside the deck 21.

[0103] As Figure 12 and Figure 13 shown, in this arrangement, all three columns partially extend out of the deck 21, thereby reducing the cantilever length on each side of the deck 21, which is beneficial to reducing the maximum bending moment of the cantilever part and reducing its structural damage.

[0104] Preferably, the steel box girder assembly 26 includes three steel box girders connected in sequence from head to tail, and the three steel box girders are respectively arranged corresponding to the three connecting bodies. The connecting bodies are located on the top surfaces of the steel box girders. The three steel box girders form a triangular structure similar to the shape of the wind power foundation platform, and each steel box girder constitutes one side of the triangular structure.

[0105] Further preferably, a number of piers 25 are arranged below the steel box girders.

[0106] Embodiment 9 This embodiment provides a semi-submersible barge carrying system. On the basis of Embodiment 7, the structure to be transported 3 is a Y-shaped wind power foundation platform. The Y-shaped wind power foundation platform includes a central column and three side columns surrounding the central column. A connecting body is provided between each side column and the central column. The three side columns are the first side column, the second side column, and the third side column respectively.

[0107] In the first arrangement: The first side column and the second side column are arranged at intervals along the length direction of the deck 21. The vertical projections of the central column, the first side column, and the second side column are within the deck 21, and the projection of the third side column is outside the deck 21.

[0108] This arrangement is similar to the first arrangement in Embodiment 6, except that the Y-shaped wind power foundation platform in this embodiment has a central column. The advantages of this arrangement are the same as those of the first arrangement in Embodiment 6 and will not be elaborated here.

[0109] In the second arrangement: The first side column and the second side column are arranged along the length direction of the deck 21, and the vertical projections of the first side column, the second side column and the third side column all partially extend out of the deck 21.

[0110] This arrangement is similar to the second arrangement in Embodiment 6, the difference being that the Y-shaped wind power foundation platform in this embodiment has a central column; the advantages of this arrangement are the same as those of the second arrangement in Embodiment 6 and will not be elaborated here.

[0111] Preferably, the steel box girder assembly 26 includes three steel box girders fixedly connected together at one end at the same point, and the three steel box girders are in a Y-shaped structure. The connecting body, the central column and the three side columns are all located on the top surface of the steel box girders.

[0112] Embodiment 10 A semi-submersible barge carrying system provided in this embodiment, on the basis of Embodiment 7, the structure to be transported 3 is a rectangular oil platform.

[0113] The oil platform is supported on the deck 21 and its central axis is parallel to the central axis of the semi-submersible barge 2.

[0114] Preferably, the central axis of the oil platform coincides with the central axis of the semi-submersible barge 2, and both sides of the oil platform extend out of the deck 21; such an arrangement can take into account the advantages of the stability of the semi-submersible barge 2 and the reduction of the cantilever length on each side.

[0115] 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 method for passing an ultra-wide structure through a narrow docking port, characterized in that: It comprises a dock opening (1), wherein the top surface of a water retaining wall (13) on one side of the dock opening (1) is higher than the water surface of the external water area by a height H1, the dock is filled with water, and the structure to be transported (3) floats on the water; The steps include: S1. The semi-submersible barge (2) dives so that the deck (21) of the semi-submersible barge (2) is lower than the bottom surface of the structure to be transported (3); S2. placing the structure to be transported (3) above the deck (21); The semi-submersible barge (2) floats until the bottom surface of the portion of the structure to be transported (3) protruding from the semi-submersible barge (2) is higher than the water surface in the dock by a height H2, H2 ≥ H1, and the structure to be transported (3) is seated on the deck (21); S3. driving the semi-submersible barge (2) and the structure to be transported (3) to pass through the dock (1) together.

2. The method for passing an ultra-wide structure through a narrow docking port according to claim 1, characterized in that: The deep-shallow dock comprises a deep dock area (4) and a shallow dock area (5) connected to each other, the bottom surface of the deep dock area (4) is lower than the water surface of the external water area, and the bottom surface of the shallow dock area (5) is higher than the water surface of the external water area; the dock opening (1) connects the deep dock area (4) and the external water area, and the dock opening (1) is equipped with a floating dock door (11); The semi-submersible barge (2) is located in the deep dock area (4), and the structure to be transported (3) is located in the shallow dock area (5); The following steps are also included: In step S1, before the semi-submersible barge (2) dives: Using the floating dock door (11) to close the dock opening (1), and injecting water into the dock until the structure to be transported (3) floats; and / or, In step S3, before driving the semi-submersible barge (2) and the structure to be transported (3) to pass through the dock (1): Part of the water in the dock is drained until the water surface in the dock is flush with the water surface in the external water area, and the floating dock door (11) is moved to make the dock opening (1) unobstructed.

3. The method for passing an ultra-wide structure through a narrow docking port according to claim 1, characterized in that: Including dry docking, in step S1, before the semi-submersible barge (2) dives: Fill the dock with water until the water level inside the dock is flush with the water level outside the dock, and then float the transported structure (3); The dock door is opened and the semi-submersible barge (2) enters the dock.

4. The method for passing an ultra-wide structure through a narrow docking port according to any one of claims 1 to 3, characterized in that: In step S2, floating the semi-submersible barge (2) comprises the following steps: The semi-submersible barge (2) is floated for the first time, so that the structure to be transported (3) is seated on the deck (21); The semi-submersible barge (2) is floated for the second time, so that the deck (21) is higher than the water surface in the dock by a height of H3, where H3 ≥ H1.

5. The method for passing an ultra-wide structure through a narrow dock according to any one of claims 1 to 3, characterized in that: The semi-submersible barge (2) is provided with a semi-submersible barge winch, and a plurality of first onshore winches are provided on the shore surrounding the construction dock; connecting components are provided at the four corners of the semi-submersible barge (2), and at least four second onshore winches are provided in a circumferential direction on the shore surrounding the construction dock; In step S2: the semi-submersible barge winch is connected to a side of the structure to be transported (3) close to the semi-submersible barge (2) via a first cable (6) to pull the structure to be transported (3) forward; the first onshore winch is connected to a side of the structure to be transported (3) away from the semi-submersible barge (2) via a second cable (7) to control the direction and reduce speed; The second onshore winch is respectively connected to the connecting components at the four corners of the semi-submersible barge (2) via a third cable (8) to fix the semi-submersible barge (2).

6. A semi-submersible barge, characterized in that: A method for passing an ultra-wide structure through a narrow dock as claimed in any one of claims 1 to 5, comprising a plurality of piers (25) arranged on the deck (21), and a steel box girder assembly (26) arranged on the top surface of the piers (25), wherein the top surfaces of all the piers (25) are located at the same height, and the steel box girder assembly (26) protrudes from the side of the deck (21).

7. The semi-submersible barge according to claim 6, characterized in that: Four towers are circumferentially arranged on the deck (21), wherein the size of one of the towers in the length direction of the deck (21) is smaller than its size in the width direction of the deck (21), and the sizes of the other three towers in the length direction of the deck (21) are larger than their sizes in the width direction of the deck (21).

8. A semi-submersible barge transport system, characterized in that: Comprising a semi-submersible barge as claimed in claim 6 or 7, wherein the semi-submersible barge (2) is used to carry a structure to be transported (3) as claimed in any one of claims 1 to 5, the width of the structure to be transported (3) is greater than the width of the dock (1), and the width of the semi-submersible barge (2) is less than the width of the dock (1); The structure to be transported (3) is supported on the steel box beam assembly (26), and one side or both sides of the structure to be transported (3) protrude from the side of the deck (21); The structure to be transported (3) is a floating platform; The structure to be transported (3) is a wind power foundation platform or an oil platform.

9. The semi-submersible barge transport system according to claim 8, characterized in that: The structure to be transported (3) is a wind power foundation platform, and the structure to be transported (3) comprises three columns arranged in a triangle and a connector provided between adjacent columns, the three columns are respectively a first column (31), a second column (32) and a third column (33); The first column (31) and the second column (32) are located on one side of the deck (21) and are arranged at intervals along the length direction of the deck (21), and the third column (33) is located on the other side of the deck (21), wherein: The vertical projections of the first column (31) and the second column (32) are located within the vertical projection of the deck (21), and the vertical projection of the third column (33) is at least partially located outside the vertical projection of the deck (21); Alternatively, the vertical projections of the first column (31), the second column (32), and the third column (33) are partially located outside the vertical projection of the deck (21).

10. The semi-submersible barge transport system according to claim 9, characterized in that: The steel box beam assembly (26) comprises three steel box beams connected end to end in sequence and forming a triangle, the three steel box beams being respectively arranged corresponding to three connecting bodies, and the connecting bodies being located on the top surfaces of the steel box beams.

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