A method for hoisting and transporting a vertical conductor frame by a fixed arm crane ship

Abstract

The invention relates to the technical field of offshore wind power construction, and discloses a method for hoisting and transporting a conductor frame by a fixed-arm crane ship, which is carried out in the following steps: S1, ship positioning: calculating the anchoring point of the conductor frame transport ship, and performing anchoring positioning after the transport ship arrives at the wind farm, determining the anchoring point of the fixed-arm crane ship and positioning it, and the transport ship and the fixed-arm crane ship are berthed in a "one" shape, and the central axis of the fixed arm is aligned with the central line of the conductor frame; S2, sling hanging: fixing the sling and the shackle on the lifting point of the conductor frame in advance, adjusting the position of the fixed arm so that the hook is located above the conductor frame, and hanging the sling on the hook; S3, conductor frame hoisting: hoisting the conductor frame, hoisting the conductor frame after cutting off the conductor frame transport tooling, and the transport ship withdraws; S4, conductor frame alignment installation: positioning the fixed-arm crane ship, lowering the conductor frame to the top surface of the engineering pile, and slowly lowering the conductor frame to confirm that all the conductor frame legs are inserted into the engineering pile.

Description

Technical Field

[0001] The invention relates to the technical field of offshore wind power construction, and in particular to a method for hoisting and transporting a conductor frame by a fixed-arm crane vessel. Background Art

[0002] The jacket foundation is one of the main structural types of offshore wind power foundations. It has high overall rigidity and is less affected by environmental loads such as waves and currents, making it widely used in offshore wind power development and construction, and can be used in large wind turbines and deep sea areas. At present, the transportation of jacket foundations mostly adopts the method of vertical transportation, which has the characteristics of short jacket loading time and low cost. Although the use of a fully revolving crane ship to lift the jacket is more efficient, the fully revolving crane ship is expensive and in short supply. Therefore, it is urgent to use a construction method of using a fixed arm crane ship to lift the jacket to make up for the insufficient number of fully revolving crane ships for construction. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the existing fully revolving crane vessels are expensive, in short supply, and the construction process is not safe enough.

[0004] In order to solve the above technical problems, the object of the present invention is to provide a method for hoisting and transporting a jacket by a fixed boom crane vessel, which is carried out according to the following steps:

[0005] S1. Ship positioning: The jacket is vertically loaded on the transport ship, and the fixed boom is installed on the fixed boom crane. The anchoring point of the jacket transport ship is calculated in advance according to the position of the machine position, i.e., the lifting position. After the transport ship arrives at the wind farm, the transport ship is anchored at the calculated anchoring point. Then, the anchoring point of the fixed boom crane is determined according to the wind and wave direction and the position of the transport ship, and the fixed boom crane is positioned. The transport ship and the fixed boom crane are berthed in a "one" shape, and the central axis of the fixed boom of the fixed boom crane is aligned with the center line of the jacket;

[0006] The hoisting position mentioned in this application is the position of the engineering piles in the seawater. The engineering piles are used to install the jacket. The anchor point of the transport ship is set near this position, which is convenient for the fixed arm crane ship to quickly and accurately align and install the jacket with the engineering piles after lifting it. The straight-line berthing and the central axis of the fixed arm are aligned with the center line of the jacket, that is, the fixed arm and the jacket are on the same straight line, so that the fixed arm crane ship can move the jacket on the same straight line, which is convenient for more accurate installation of the jacket.

[0007] S2. Installation of slings: Before the jacket is shipped, the slings and shackles are fixed on the lifting points of the jacket in advance. By adjusting the positions of the fixed boom crane and the fixed boom on it, the hook is located directly above the jacket lifting point, and then the slings are hung on the hook;

[0008] S3. Lifting of the conductor rack: After the installation of the lifting slings, the conductor rack transport tooling is cut off until the cutting work is completed. The conductor rack is lifted by the fixed arm crane ship until the sling is under stress and then stopped. That is, the bottom of the conductor rack is at a certain distance from the transport ship so that the gravity of the conductor rack can be used to keep it stable. After the conductor rack is lifted to a certain distance, the transport ship withdraws from the construction site. The transport tooling includes side limiters, supports, and structural parts for fixing the conductor rack.

[0009] S4. Alignment and installation of the jacket: Use the positioning system to move the fixed-arm crane vessel for rough positioning, then initially lower the jacket until the jacket legs are 0.8-1.2m away from the top of the engineering piles, then stop lowering, slowly lower the jacket to align the jacket legs with the engineering piles one by one, and continue lowering until the slings are in a stress-free state, that is, the bottom ends of the jacket legs are inserted into the engineering piles, and the jacket is supported by the engineering piles. After confirming that all the jacket legs are inserted into the engineering piles and there are no structural abnormalities, the jacket installation is completed.

[0010] Preferably, the fixed arm is a single arm, which is provided with double main hooks, i.e. double lifting hooks, so as to lift the jacket more stably, so that the jacket can be lowered horizontally during the lowering process, thereby reducing the alignment time of the jacket legs and the engineering piles.

[0011] Preferably, in step S1, the fixed boom crane vessel uses an anchor boat and an anchor chain provided on the anchor boat to anchor and position the transport vessel and the fixed boom crane vessel respectively.

[0012] Preferably, in step S2, a fixed boom crane ship rigging hook is used to send the operator riding in the hanging basket to the top of the conductor frame, and then the hook is lowered and the sling is hung on the hook.

[0013] Preferably, in step S4, artificial diving is adopted to dive to the engineering pile, and the operator of the fixed boom crane vessel communicates with the divers to slowly lower the jacket, align the jacket legs with the engineering piles one by one, and confirm that each jacket leg is accurately inserted into the corresponding engineering pile and there is no abnormality in the structure.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The method for hoisting and transporting a jacket by a fixed-arm crane vessel of the present invention provides a new jacket hoisting method, relieves the pressure of scarcity of fully-rotating crane vessel resources, effectively reduces the investment in jacket installation and construction costs, and promotes the reduction of fully-rotating crane vessel rental costs. It does not require a large space required for a fully-rotating crane vessel to rotate 360 ​​degrees. It only needs to move the jacket between the fixed-arm crane vessel and the transport ship, thereby improving the safety of the construction process.

[0016] 2. The method for lifting and transporting the conductor frame by a fixed-arm crane vessel of the present invention uses a fixed-arm single-arm double-main hook to lift the conductor frame. Through the linkage of the double hooks, the horizontality of the conductor frame during the lowering process can be more effectively adjusted, the alignment time of the conductor frame legs and the engineering piles can be reduced, and the construction of offshore wind power projects can be accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flow chart of a method for hoisting a vertical transport guide tube by a fixed boom crane vessel.

[0018] Figure 2 It is a schematic diagram of step S1 of the method for hoisting a vertical transport guide tube by a fixed boom crane vessel of the present invention.

[0019] Figure 3 It is a schematic diagram of step S2 of the method for hoisting a vertical transport guide tube by a fixed boom crane vessel of the present invention.

[0020] Figure 4 It is a schematic diagram of step S3 of the method for hoisting a vertical transport guide tube by a fixed boom crane vessel of the present invention.

[0021] Figure 5 It is a schematic diagram of step S4 of the method for hoisting a vertical transport guide tube by a fixed boom crane vessel of the present invention.

[0022] Figure 6 for Figure 3 An enlarged view of the local structure A in FIG.

[0023] Description of Figure Numbers:

[0024] In the figure, 1, fixed boom crane vessel; 2, fixed boom; 3, transport ship; 4, conductor frame; 40, conductor frame support leg; 5, sling; 6, shackle; 7, hook; 8, engineering pile; 9, rigging hook; 10, anchor chain; 11, sea water; 12, central axis of fixed boom; 13, center line of conductor frame. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example: As shown in the attached Figures 1 to 6 As shown, this embodiment provides a method for hoisting and transporting a jacket by a fixed boom crane vessel, which is performed according to the following steps:

[0027] S1. Ship positioning: as attached Figure 2As shown, the jacket 4 is vertically loaded on the transport ship 3, and the fixed boom 2 is arranged on the fixed boom crane ship 1. The fixed boom 2 is a single boom, and a double main hook, i.e., two hooks 7, is provided thereon to lift the jacket 4 more stably, so that the jacket 4 can be horizontally lowered during the lowering process, thereby reducing the alignment time of the jacket legs 40 and the engineering piles 8.

[0028] The anchoring point of the jacket 4 transport ship 3 is calculated in advance according to the position of the machine position, that is, the lifting position. After the transport ship 3 arrives at the wind farm, the transport ship 3 is anchored and positioned by the anchor boat and the anchor chain 10. Specifically, after the anchor boat is anchored, the anchor chain 10 on the anchor boat is used to pull and adjust the position of the transport ship, so that the transport ship 3 is anchored at the calculated anchoring point, and then the transport ship anchors for self-positioning.

[0029] Then, the anchoring point of the fixed-arm crane vessel 1 is determined according to the direction of wind and waves and the position of the transport ship 3, and the fixed-arm crane vessel 1 is moved and positioned. Specifically, after the fixed-arm crane vessel 1 reaches its anchoring point, the fixed-arm crane vessel 1 is first anchored and positioned, and then the position of the fixed-arm crane vessel 1 is adjusted by the anchor chain 10 on the anchor boat. At the same time, the position of the fixed-arm crane vessel is determined by the GPS positioning system, and the anchor chain is tightened to position the fixed-arm crane vessel 1 and stop it on the sea surface, so that the transport ship 3 and the fixed-arm crane vessel 1 are berthed in a "one" shape, as shown in the attached figure. Figure 2 As shown, the center axis 12 of the fixed boom 2 of the fixed boom crane vessel 1 is aligned with the center line 13 of the jacket, and the transport vessel 3 and the fixed boom crane vessel 1 are both positioned by anchor chains of multiple anchor boats.

[0030] S2. Lifting sling installation: as attached Figure 3 and 6 As shown, before the jacket 4 is shipped, the sling 6 and the shackle 7 are fixedly installed on the lifting point of the jacket 4 in advance, and the hook 7 is located directly above the lifting point of the jacket 4 by adjusting the positions of the fixed boom crane ship 1 and the fixed boom 2 thereon, and then the sling 5 is hung on the hook 7. Specifically, the rigging hook 9 of the fixed boom crane ship 1 is used to send the operator riding in the hanging basket to the top of the jacket 4, and then a main hook 7 and an auxiliary hook 7 are lowered, the sling 5 is hung on the hook 7, and then the operator is hoisted back to the deck of the fixed boom crane ship 1 by the rigging hook.

[0031] S3. Lifting of the conductor rack: as shown in the attached Figure 4As shown, after the sling is hung, the transport tooling of the jacket 4 is cut off until it is completed, and then the jacket 4 is lifted by the fixed arm crane ship 1 until the sling 5 is in a stressed state and then stops, that is, the bottom of the jacket 4 is at a certain distance from the transport ship 3, so that the gravity of the jacket 4 can be used to keep it stable, and the jacket 4 continues to be lifted. During the lifting process, the heights of the main hook and the auxiliary hook are appropriately adjusted to adjust the center of gravity of the jacket to between the two hooks to reduce the shaking amplitude of the jacket during the lifting process, and then the center of gravity is maintained between the two hooks until it is raised to a certain distance. The raised distance should be greater than the height of the transport ship, so that the transport ship 3 can then withdraw from the construction site; the transport tooling includes structural members for limiting and supporting the jacket 4, such as jacket piers and lateral limiting binding and fixing devices.

[0032] S4. Pipe frame alignment installation: as shown in the attached Figure 5 As shown, the positioning system is used to monitor the relative position relationship between the conductor frame legs and the engineering piles in real time, and the fixed arm crane ship 1 is moved for rough positioning. When the distance difference between the plane positions does not exceed 50cm, the torsion angle of the fixed arm crane ship is adjusted, and the torsion angle is adjusted to correspond to the position of the conductor frame legs and the engineering piles, so as to facilitate the alignment and installation of the conductor frame legs and the engineering piles. Then, the conductor frame 4 is initially lowered until the conductor frame legs 40 are 0.8-1.2m away from the top surface of the engineering piles 8 in the seawater 11, and then the conductor frame 4 is slowly lowered to align the conductor frame legs 40 with the engineering piles 8 one by one. Specifically, the long legs of the conductor frame are aligned with the engineering piles first, and then the short legs of the conductor frame are aligned, until all the conductor frame legs are aligned with the engineering piles.

[0033] Then continue to lower until the sling 5 is in a stress-free state, that is, the bottom end of the conductor frame leg 40 is inserted into the engineering pile 8 to support the conductor frame 4 by the engineering pile 8, and confirm that the conductor frame leg 40 is fully inserted into the engineering pile 8 without structural abnormalities, that is, the conductor frame 4 is hoisted. The engineering pile 8 is made of steel pipe, which means that the engineering pile 8 is a steel pipe pile. Specifically, the conductor frame 4 is slowly lowered by the operator of the fixed arm crane ship 1 communicating with the diving personnel, and the conductor frame leg 40 is aligned with the engineering pile 8 one by one, and it is confirmed whether the conductor frame leg 40 is inserted into the engineering pile 8, and whether the structural parts are abnormal.

[0034] In summary, the embodiment of the present invention provides a method for lifting and transporting a conductor frame by a fixed-arm crane vessel, and provides a new method for lifting a conductor frame. It alleviates the pressure of scarce full-revolving crane vessel resources, effectively reduces the investment in the construction cost of conductor frame installation, and promotes the reduction of the rental cost of full-revolving crane vessels; the present invention uses a fixed-arm single-arm double-main hook to lift the conductor frame, and through the linkage of the double hooks, it can more effectively adjust the horizontality of the conductor frame during the lowering process, and reduce the alignment time of the conductor frame legs and the engineering piles.

[0035] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for hoisting and transporting a conductor frame by a fixed boom crane vessel, characterized in that: Follow these steps: S1. Ship positioning: The anchoring point of the jacket transport ship is calculated in advance according to the position of the machine position. After the transport ship arrives at the wind farm, the transport ship is anchored at the calculated anchoring point. Then, the anchoring point of the fixed-arm crane ship is determined according to the wind and wave direction and the position of the transport ship, and the fixed-arm crane ship is positioned. The transport ship and the fixed-arm crane ship are berthed in a "one" shape, and the central axis of the fixed arm of the fixed-arm crane ship is aligned with the center line of the jacket; S2. Installation of slings: Before the jacket is shipped, the slings and shackles are fixed on the lifting points of the jacket in advance. By adjusting the positions of the fixed boom crane and the fixed boom on it, the hook is located directly above the jacket lifting point, and then the slings are hung on the hook; S3, jacket hoisting: Cut off the jacket transport tooling until it is complete, then use the fixed arm crane ship to lift the jacket until the sling is under stress and then stop, then continue to lift the jacket to a certain distance, and then the transport ship will leave the construction site S4. Alignment and installation of the jacket: Use the positioning system to move the fixed arm crane ship for rough positioning, and then initially lower the jacket until the jacket legs are 0.8-1.2m away from the top of the engineering pile. Then lower the jacket to align the jacket legs with the engineering piles, and continue to lower the jacket until the slings are in a stress-free state. After confirming that all the jacket legs are inserted into the engineering piles and there are no structural abnormalities, the jacket installation is completed; In step S3, the fixed arm frame is provided with hooks for lifting the jacket in groups. During the lifting process of the jacket, the heights of the hooks are appropriately adjusted so that the center of gravity of the jacket is adjusted between the two hooks. The fixed arm frame is a single arm frame with double main hooks, so as to stably lift the jacket, so that the jacket can be lowered horizontally during the lowering process, thereby reducing the alignment time between the jacket legs and the engineering piles. In the step S4, the jacket legs are positioned, and when the distance between the jacket legs and the engineering piles in the plane is less than or equal to 50 cm, the torsion angle of the fixed boom crane vessel is adjusted; In step S4, artificial diving is adopted to dive to the engineering pile, and the operator of the fixed boom crane vessel communicates with the divers to slowly lower the jacket, align the jacket legs with the engineering piles one by one, and confirm that the jacket legs are inserted into the engineering piles and there are no structural abnormalities.

2. The method for hoisting and transporting a conductor frame by a fixed boom crane vessel according to claim 1, characterized in that: In step S1, the fixed boom crane vessel uses the anchor boat and the anchor chain arranged on the anchor boat to anchor and position the transport vessel and the fixed boom crane vessel respectively.

3. The method for hoisting and transporting a conductor frame by a fixed boom crane vessel according to claim 1, characterized in that: In step S2, the operator riding in the hanging basket is sent to the top of the conductor frame by using the rigging hook of the fixed boom crane ship, and then the hook is lowered and the sling is hung on the hook.

4. The method for hoisting and transporting a conductor frame by a fixed boom crane vessel according to claim 1, characterized in that: The transport tooling includes structural parts for side limiting, supporting and fixing the conductor frame.

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