A ship bow based method for jacking a very large jacket onto a ship

Abstract

The application discloses a large-scale jacket slip-on ship method based on a bow, and belongs to the technical field of ocean engineering, and comprises the following steps: a transport barge is alongside a wharf, a jack fixing mechanism is welded at the bow of the transport barge; a tension jack is placed in the jack fixing mechanism; a towing fixing mechanism is welded on a sliding shoe at the bottom of the jacket; a steel strand is connected between the tension jack and the towing fixing mechanism; a towing system is laid out, and a power station is connected to the bow; an auxiliary tugboat is close to the bow of the transport barge, and the steel strand of the tension jack is connected with the auxiliary tugboat; and the tension jack is started to complete jacket towing and loading. In the application, the tension jack is fixed to the bow, replacing the original bow fixing, and the position is kept unchanged during towing, compared with the traditional method, the total weight of towing is reduced, the power loss in the process of the traditional towing method is reduced, and the construction fault tolerance is increased.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, and in particular relates to a method for sliding and loading ultra-large jackets onto ships based on the bow. Background Technology

[0002] Jacket platforms are the most commonly used structural form in the offshore oil and gas development industry, and the corresponding method for loading jackets onto ships is primarily towing. Traditional towing of ultra-large jackets involves placing slipways on land and barges, welding the towing structure at the jacket's slipper, welding the bow to the top of the barge for fixation, connecting steel strands and deploying a traction system between the towing point and the bow fixation, and using tension jacks as the power source. The loading operation is completed by tightening the steel strands. However, because the tension jacks are mounted on the slippers and move synchronously with the jacket, additional support platforms and a corresponding power station support platform are required. During towing, the corresponding construction equipment and personnel also need to move with the jacket, increasing the weight of the towed structure and being significantly affected by personnel and equipment.

[0003] Therefore, there is an urgent need to design a method for sliding and loading ultra-large jackets onto ships based on the bow to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a method for loading ultra-large jacket structures onto ships by sliding them from the bow. This method has the advantage of reducing the construction steps involved in towing and loading large jacket structures onto ships, thereby improving the efficiency of such construction and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of the present invention for a method of sliding and loading ultra-large jackets onto a ship based on the bow is as follows:

[0006] A method for loading ultra-large jackets onto a ship based on the bow, comprising the following steps:

[0007] S1. The transport barge is moored alongside the dock, and a jack fixing mechanism is welded to the bow of the transport barge.

[0008] S2. Place a tension jack inside the jack fixing mechanism;

[0009] S3. Weld a drag-and-fix mechanism onto the slipper at the bottom of the guide frame;

[0010] S4. Steel strand connecting the tension jack and the drag anchor;

[0011] S5. A towing system is installed, with the power station connected to the bow of the ship;

[0012] S6. The auxiliary tugboat is connected to the bow of the transport barge by the steel strand passing through the tension jack.

[0013] S7. Start the pulling jack to complete the dragging and loading of the jacket frame onto the ship.

[0014] Furthermore, in S1, the jack fixing mechanism includes a fixing frame, which is connected to the fixed end of the tension jack. The fixing frame has a first through hole for the steel strand to pass through the first through hole into the fixing frame and connect to the piston end of the tension jack.

[0015] Furthermore, in S2, the fixed end of the tension jack is connected to the fixed frame, and the piston end of the tension jack faces the first through hole.

[0016] Furthermore, in S3, the drag-and-fix mechanism includes a top plate with a second through hole for the steel strand to pass through.

[0017] Furthermore, the drag-and-fix mechanism is located near the top of the slipper.

[0018] Furthermore, in S5, two sets of power stations can be arranged on both sides of the slide.

[0019] Furthermore, in S5, a power station is arranged between the two slides.

[0020] Furthermore, in S6, before the towing and loading begins, the length of the steel strand passing through the tension jack should be greater than the distance from the tension jack to half the deck width of the auxiliary tugboat.

[0021] Furthermore, the tugboat can accommodate steel strands of the full length.

[0022] Furthermore, in S7, the steel strands are cut every 5m when the jacket is being pulled.

[0023] The present invention has the following advantages:

[0024] (1) In the traditional method of towing and loading a jacket onto a ship, the tension jack is placed on the side of the slipper and the front of the jack is connected to the top plate of the towing structure. During the towing process, the jack moves forward with the jacket. In this invention, the tension jack is fixed to the bow of the ship instead of the original bow fixing. The position remains unchanged during the towing process. Compared with the traditional method, the overall weight of the towing is reduced and the power loss during the traditional towing process is reduced, and the construction error tolerance is increased.

[0025] (2) In the past, the position of the pulling jack was constantly changing during towing, and the corresponding power station had to be moved. Often, the power station platform was welded at the skid and placed there, which increased the overall weight of the towing. However, in this invention, since the position of the pulling jack is fixed, the arrangement of the power station can also be fixed. Two sets of power stations can be arranged on both sides of the skid, or one set of power stations can be arranged in the middle of the two skids, provided that the pipeline layout requirements are met. This effectively reduces the space occupied by auxiliary equipment on the bow deck.

[0026] (3) The present invention uses an auxiliary tugboat to berth the bow of the barge to handle the steel strands stretched out during the towing process. Compared with the existing method of moving with the guide frame to cut the steel strands into sections during the towing process, it effectively reduces the movement of personnel and equipment during construction and shortens the overall towing time. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the jacket support sliding installation structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the dragging and fixing mechanism of the present invention on the slipper;

[0029] Figure 3 This is a schematic diagram of the dragging and fixing mechanism of the present invention;

[0030] Figure 4 This is a schematic diagram of the jack fixing mechanism of the present invention;

[0031] The markings in the diagram are as follows: 1. Transport barge; 11. Auxiliary tugboat; 2. Jacket; 21. Towing and securing mechanism; 3. Jack securing mechanism; 31. Power station; 32. Steel strand; 4. Slipper; 41. Second perforation; 42. First perforation; 5. Pulling jack. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0034] The following is a reference to the appendix. Figure 1 To be continued Figure 4 This invention describes a method for loading ultra-large jackets onto a ship based on the bow.

[0035] Currently, the traditional method of towing and loading ultra-large jacket structures onto ships mainly involves placing slipways on land and barges, welding the towing structure at the jacket slipper, welding the bow to the top of the barge for fixation, connecting steel strands and deploying a traction system between the towing point and the bow fixation, and using tension jacks as the power source. The loading operation is completed by tightening the steel strands. However, because the tension jacks are mounted on the slippers and move synchronously with the jacket structure, additional support platforms and a corresponding power station support platform are required. During the towing process, the corresponding construction equipment and personnel also need to move with the jacket structure. This method of towing and loading onto ships increases the weight of the towed structure and is significantly affected by personnel and equipment.

[0036] Therefore, the present invention includes the following steps:

[0037] S1. Transport barge 1 is moored alongside the dock, and jack fixing mechanism 3 is welded to the bow of transport barge 1.

[0038] The jack fixing mechanism 3 is a square steel structure. In S1, the jack fixing mechanism 3 includes a fixing frame, which is connected to the fixing end of the tension jack 5. The fixing frame has a first through hole 42 so that the steel strand 32 can pass through the first through hole 42 into the fixing frame and connect to the piston end of the tension jack 5.

[0039] A reinforcing rib is welded to the fixed frame, and the end of the reinforcing rib away from the fixed frame is welded to the bow of the transport barge 1.

[0040] S2. Place the tension jack 5 inside the jack fixing mechanism 3;

[0041] In S2, the fixed end of the tension jack 5 is connected to the fixed frame, and the piston end of the tension jack 5 faces the first through hole 42.

[0042] S3. Weld a dragging and fixing mechanism 21 onto the slipper 4 at the bottom of the guide frame 2;

[0043] The drag-and-fix mechanism 21 is a steel reinforced structure. The drag-and-fix mechanism 21 is located near the top of the slipper 4. In S3, the drag-and-fix mechanism 21 includes a top plate with a second through hole 41 for the steel strand 32 to pass through.

[0044] The towing and fixing mechanism 21 must be able to meet the requirement of towing the guide frame 21 to the designated position. The towing and fixing mechanism 21 is arranged asymmetrically on both sides of the slide shoe 4, and the distance between the inner and outer sides in the direction of the slide track is not less than 10m.

[0045] S4, the steel strand 32 connecting the tension jack 5 and the drag fixation, the end of the steel strand 32 is polished smooth;

[0046] S5. The towing system is installed, with the power station 31 connected to the bow and hydraulic lines. The power station 31 is fixed in place and does not move with the skid 4.

[0047] In the first embodiment of the power station 31, two sets of power stations 31 can be arranged on both sides of the slide.

[0048] In a second embodiment of the power station 31, a set of power stations 31 is arranged between two slides.

[0049] To reduce deck space usage.

[0050] S6. The auxiliary tugboat 11 is connected to the bow of the barge transport barge 1 by the steel strand 32 passing through the tension jack 5.

[0051] In S6, before the towing and loading begins, the length of the steel strand 32 passing through the tension jack 5 should be greater than the distance from the tension jack 5 to half the deck width of the auxiliary tugboat 11.

[0052] The tugboat can accommodate the full length of steel strand 32.

[0053] S7. Adjust the barge load to keep the top surface of the slide level, and then start the pulling jack 5 to complete the towing and loading of the jacket 2 onto the ship.

[0054] In S7, the deck of the auxiliary tugboat 11 should be prepared with cutting tools and personnel in advance. When the guide frame 2 is towed, the front end of the steel strand 32 should be cut every 5m and placed on the auxiliary tugboat 11. During the process, the towing should be stopped due to personnel or equipment reasons.

[0055] The present invention has the following advantages:

[0056] (1) In the traditional method of towing the jacket 2 onto a ship, the tension jack 5 is placed on the side of the slipper 4, and the front of the jack is connected to the top plate of the towing structure. During the towing process, the jack moves forward together with the jacket 2. In this invention, the tension jack 5 is fixed to the bow of the ship, replacing the original bow fixing. The position remains unchanged during the towing process. Compared with the traditional method, the overall weight of the towing is reduced and the power loss during the traditional towing process is reduced, and the construction error tolerance is increased.

[0057] (2) In the past, the position of the pulling jack 5 was constantly changing during towing, and the corresponding power station 31 also had to be moved. Often, the power station 31 was placed on a platform welded at the slipper 4, which increased the overall weight of the towing. However, in this invention, since the position of the pulling jack 5 is fixed, the arrangement of the power station 31 can also be fixed. Two sets of power stations 31 can be arranged on both sides of the slipway, or one set of power stations 31 can be arranged in the middle of the two slipways, provided that the pipeline layout requirements are met. This effectively reduces the space occupied by auxiliary equipment on the bow deck.

[0058] (3) The present invention uses an auxiliary tugboat 11 to approach the bow of the barge to handle the steel strands 32 stretched out during the towing process. Compared with the existing method of moving with the guide frame 2 to cut the steel strands 32 into sections during the towing process, this method effectively reduces the movement of personnel and equipment during construction and shortens the overall towing time.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for loading ultra-large jacketed structures onto a ship based on the bow, characterized in that, Includes the following steps: S1. The transport barge is moored alongside the dock, and a jack fixing mechanism is welded to the bow of the transport barge. S2. Place a tension jack inside the jack fixing mechanism; S3. Weld a drag-and-fix mechanism onto the slipper at the bottom of the guide frame; S4. Steel strand connecting the tension jack and the dragging and fixing mechanism; S5. A towing system is installed, with the power station connected to the bow of the ship; S6. The auxiliary tugboat is connected to the bow of the transport barge by the steel strand passing through the tension jack. S7. Start the lifting jack to complete the dragging and loading of the jacket structure onto the ship; In S1, the jack fixing mechanism includes a fixing frame, which is connected to the fixed end of the tension jack. The fixing frame has a first through hole for the steel strand to pass through the first through hole into the fixing frame and connect to the piston end of the tension jack. In S3, the drag-and-fix mechanism includes a top plate with a second through hole for the steel strand to pass through. The drag-and-fix mechanism is located near the top of the slipper; In S6, before the towing and loading begins, the length of the steel strand passing through the tension jack should be greater than the distance from the tension jack to half the deck width of the auxiliary tugboat. The tugboat can accommodate steel strands of the full length; In S7, when the jacket is being pulled, the steel strands are cut every 5m.

2. The method for loading ultra-large jacketed structures onto a ship based on the bow, as described in claim 1, is characterized in that... In S2, the fixed end of the tension jack is connected to the fixed frame, and the piston end of the tension jack faces the first through hole.

3. The method for loading ultra-large jacketed structures onto a ship based on the bow, as described in claim 1, is characterized in that... In S5, two sets of power stations are arranged on both sides of the slide.

4. The method for sliding and loading ultra-large jacketed structures onto a ship based on the bow, as described in claim 1, is characterized in that... In S5, a power station is set up between the two slides.

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