An ultra large jacket installation vessel design and method of use

Abstract

The application discloses a design and use method of a super-large jacket loading and dragging system, which comprises the following steps: placing a land slide, and making a barge approach a wharf; fixing a barge rocker arm, placing a steel slide on a deck, and placing a guide sliding block at the rear end of the last slide; welding a ship bow fixing on the deck, and fixing the last slide as a whole; making the barge tail approach the wharf and be moored, arranging a dragging structure and a steel strand traction system on both sides of a large slide shoe, and installing a jacket boosting jack at the top of a small slide shoe and the large slide shoe; setting a temporary support platform in the middle of the large slide shoe and the small slide shoe to place a power station; adjusting the load of the barge, keeping the top surface of the slide flush, starting the pulling force and the boosting jack at the large slide shoe and the small slide shoe to drag and load the jacket according to preset ballast steps; after the dragging is completed, the bottom and the top of the jacket respectively protrude out of the bow and the stern, the jacket is welded and fixed, and preparation for leaving the port is made; and the application can realize the loading and sea transportation of a super-large deepwater jacket.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and more particularly to a design and method for installing ultra-large jackets on ships. Background Technology

[0002] my country's offshore oil and gas exploration and development industry is accelerating, with oil and gas production growth gradually shifting from shallow to deep-sea areas. However, correspondingly, with the increase in water depth, the weight of the jacket foundation, which serves as the basis for offshore platforms, increases exponentially, posing significant challenges to the loading, transportation, and other construction work of the jacket platform.

[0003] Traditionally, loading large offshore structures onto ships primarily involves towing. This method relies on steel cables connecting the towing points of slipways to the anchor points of barges, using tension jacks as the pulling force, and towing via slipways to complete the loading operation. However, due to limitations such as slipway length, the weight requirements of the jacket structure itself, and insufficient towing system capacity, this towing method is insufficient for loading ultra-large jacket structures weighing over 30,000 tons. Therefore, by improving the design of the jacket structure towing system and enhancing its towing capacity, a design and application method suitable for loading ultra-large jacket structures onto ships can be developed to meet the needs of deep-water oil and gas field development in my country. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for loading and constructing ultra-large jackets weighing more than 30,000 tons onto ships.

[0005] To address the aforementioned technical problems, this invention provides a design and method for the installation and use of ultra-large jacket structures on ships, comprising the following steps: S1: Place land slides on the land site and transport barges alongside the dock; S2: Fix the rocker arm at the stern of the barge, place the slide on the barge deck, and place the guide slider at the rear end of the last slide section. S3: Weld the bow fixation at the last section of the barge deck slipway; S4: Moor the stern of the barge to the dock and moor it. Arrange towing structures and steel strand traction systems on both sides of the large skid and install booster jacks on the top. Install booster jacks on the top of the small skid. S5: Calculate the maximum static friction force and determine the number of tension jacks, arrange the tension jacks at the slipper, and set up a temporary support platform for the power station; S6: Adjust the barge load until the deck plane is level with the land plane, start the pull jacks to drag the jacket onto the ship, and at the same time start the booster jacks at the large and small slip shoes to provide additional thrust to load the jacket onto the ship. S7: The jacket is towed and loaded onto the ship until the bottom of the large skid shoe is flush with the end of the skid. After towing, the bottom and top of the jacket protrude from the bow and stern of the ship, respectively. The jacket is then welded and fixed in place, ready to leave the port.

[0006] According to a preferred embodiment of the present invention, in step S1, the land slide needs to extend 190-210mm beyond the front edge of the dock, and the slide at the front edge of the dock uses steel slide blocks.

[0007] According to a preferred embodiment of the present invention, in step S2, the length and width of the guide slider are the same as those of the deck slide, and the guide slider is directly welded to the deck and further fixed to the deck by means of triangular ribs.

[0008] According to a preferred embodiment of the present invention, in step S3, the side of the bow fixed is welded to the side of the last section of the slide by means of a connecting stiffener.

[0009] According to a preferred embodiment of the present invention, in step S3, reinforcing triangular ribs are welded to the fixed side of the bow and the rear end, and the traction system steel strands are fixedly connected to the top position of the front section.

[0010] According to a preferred embodiment of the present invention, in step S4, the length of the large slipper is less than the length of the jacket truss.

[0011] According to a preferred embodiment of the present invention, in step S5, the temporary support platform of the power station should be equidistant from the tension jack.

[0012] According to a preferred embodiment of the present invention, in step S7, the center of gravity of the jacket should be located near the center of the barge, the length of the bottom protruding from the bow should be less than the length of the top protruding from the stern, and the elastic deformation of the slipper caused by its own weight should be less than the change in vertical distance of the guide slider arc surface.

[0013] The technical effects of this invention are as follows: 1. This invention provides a design and method for loading ultra-large jacket structures onto ships. Through a towing structure-slipway-bow fixing system, it utilizes a large slipper for traction and a small slipper for multi-point propulsion, thereby achieving the beneficial effect of loading ultra-large deep-water jacket structures onto ships.

[0014] 2. The present invention provides a design and method for loading and using ultra-large jacket structures onto ships, enabling jacket structures larger than barges to be smoothly towed and loaded onto ships to designated locations on the barges. This allows for the loading and maritime transport of ultra-large deep-water jacket structures. The distribution design of large and small slippers reduces the elastic deformation of large jacket structures during construction, while also making the arrangement of jacks more flexible and significantly improving the propulsion capacity. This not only alleviates the pressure on equipment resources but also reduces construction risks and costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the towing and loading of an ultra-large jacket onto a ship, illustrating the design and usage method of an ultra-large jacket for ship loading according to the present invention. Figure 2 This is a schematic diagram of the towing and loading of an ultra-large jacket onto a ship, illustrating the design and usage method of an ultra-large jacket for ship loading according to the present invention. Figure 3 This is a schematic diagram of a guide slider for a design and usage method of an ultra-large jacket rack on a ship according to the present invention. Figure 4 This is a front view of the guide slider of the design and use method of an ultra-large jacket rack for ship loading according to the present invention; Figure 5 This is a top view of the guide slider of the design and use method of an ultra-large jacket rack for ship loading according to the present invention; Figure 6 This is a side view of the guide slider of the design and use method of an ultra-large jacket rack for ship loading according to the present invention; Figure 7 This is a schematic diagram of the bow fixing-slipway for a design and usage method of an ultra-large jacketed structure on a ship according to the present invention; Figure 8 This is a front view of the bow fixing-slipway of the present invention, which describes the design and use method of loading ultra-large jacket onto a ship. Figure 9 This is a rear view of the bow fixing-slipway of the present invention, which describes a design and usage method for installing an ultra-large jacket on a ship. Figure 10 This is a side view of the bow fixing-slipway of the present invention, which describes the design and use method of installing an ultra-large jacket on a ship. Figure 11 This is a top view of the bow fixing-slipway of the present invention, which describes the design and use method of installing an ultra-large jacket on a ship. Figure 12 This is a schematic diagram of the distribution of the size slippers of the jacket in the design and use method of the ultra-large jacket for ship loading according to the present invention.

[0016] Attached reference numerals: 1-jacket; 2-barge; 3-land slideway; 4-rocker arm; 5-slideway; 6-bow fixation-slideway; 7-guide slider; 8-temporary support platform for power station; 9-arc plate; 10-triangular rib plate; 11-bow fixation; 12-connecting rib plate; 13-small slide shoe; 14-large slide shoe; 15-boosting jack. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the invention.

[0018] like Figures 1 to 12As shown, a design and method for loading and using an ultra-large jacket structure on a ship includes the following steps: S1: Place the land slide 3 on the land site and transport barge 2 alongside the dock; S2: Fix the rocker arm 4 at the stern of the barge, place the slide 5 on the barge deck, and place the guide slider 7 at the rear end of the last slide 5. S3: Weld bow fixing 11 at position 5 of slipway at the end of barge deck; S4: Moor the two barges to the dock and moor them. Arrange towing structures and steel strand traction systems on both sides of the large skid 14 and install booster jacks 15 on the top. Install booster jacks 15 on the top of the small skid 13. S5: Calculate the maximum static friction force and determine the number of tension jacks, arrange the tension jacks at the slipper, and set up a temporary support platform 8 for the power station; S6: Barge 2 is loaded until the deck plane is level with the land plane. The pull jack is activated to drag the jacket 1 onto the ship. At the same time, the booster jacks 15 at the large slip shoe 14 and the small slip shoe 13 are activated to provide additional thrust to load the jacket 1 onto the ship. S7: The jacket is towed and loaded onto the ship until the bottom of the large skid shoe 14 is flush with the end of the slipway 5. After towing, the bottom and top of the jacket 1 protrude from the bow and stern of the ship respectively. The jacket 1 is then welded and fixed in place, ready to leave the port.

[0019] This invention provides a design and method for a towing system for ultra-large jacket structures, enabling the jacket structure 1, which is larger than a barge, to be smoothly towed and loaded onto a designated location on a barge 2. This allows for the loading and maritime transport of ultra-large deep-water jacket structures 1. The distribution design of the large slipper 14 and the small slipper 13 reduces the elastic deformation of the large jacket structure 1 during construction, while also allowing for more flexible jack placement and significantly improving propulsion capacity. This alleviates the pressure on equipment resources and reduces construction risks and costs.

[0020] like Figures 1 to 12 As shown, the method of the present invention includes the following steps: The first step is to clear the land area to avoid interference during the towing of the ultra-large deep-water jacket 1. Then, the land slide 3 (concrete land slide) is placed, extending to the edge of the dock and protruding 200mm beyond it. Steel slide blocks are used for the land slide at the dock's edge. The transport barge 2 is then moored alongside the dock for preparation of onboard construction.

[0021] The second step involves fixing the stern rocker arm 4 of the barge, placing the steel slipway 5 on the deck, and placing the guide slider 7 at the rear end of the last slipway 5. The guide slider 7 has the same length and width dimensions as the steel slipway 5 on the deck, and its top plate is an arc-shaped plate 9 with a radius of 5m, which can effectively eliminate the deformation caused by the weight of the protruding part of the jacket frame 1 when it protrudes from the bow, as well as the locking force generated at the end of the steel slipway 5. The guide slider 7 is directly welded to the deck and further secured to the deck using triangular stiffening plates 10.

[0022] The third step involves welding a bow fixation 11 to the aft section of the deck slipway 5. The bow fixation 11 is welded to the side of the aft section slipway 5 via connecting stiffeners 12, enhancing the strength of the fixing point and facilitating the alignment of the steel strands between the towing point and the fixing point. It also acts as a limiter during the towing of the jacket 1, preventing the skid shoes from detaching from the slipway. Reinforcing triangular stiffeners are welded to the other side and rear end of the bow fixation 11, with the traction system steel strands fixedly connected to the top of its front section. Based on the weight of the ultra-large jacket 1 and the strength requirements of the fixing point, an integrated bow fixation-slipway 6 can be added to the front section of the aft section slipway 5.

[0023] In the fourth step, the two barges are moored at the dock. The towing slippers at the bottom of the super-large jacket 1 are divided into two parts: a large slipper 14 and a small slipper 13. The length of the large slipper 14 is less than the length of the jacket 1's launching truss. Its two sides have reinforced towing structures and can accommodate towing structures and steel strand traction systems. The top can also be equipped with booster jacks 15 and a steel strand traction system, with steel strands inserted. The ends of the steel strand traction systems need to be ground and fixed to the bow-fixing slipway 6 device. The top of the small slipper 13 can be equipped with booster jacks 15. Their length should meet the requirement that the large jacket 1 does not deform when it is laid down. The number can also be increased. The total length of the large slipper 14 and the small slipper 13 is less than or equal to the length of the jacket 1's launching truss. Booster jacks 15 can be flexibly installed on the top of both the small slipper 13 and the large slipper 14. The booster parts can be structurally reinforced.

[0024] Fifth, determine the number of jacks based on the calculation results of the maximum static friction force, arrange the jacks reasonably at the slipper, and set up a temporary support platform 8 for the power station. The temporary support platform 8 for the power station should be welded to the slipper and dragged together with the guide frame 1. As the number of jacks increases and the arrangement density increases, the location of the power station should meet the distance requirements of the oil pipeline when the jacks are working normally.

[0025] Step 6: Barge 2 adjusts its load until the deck surface is flush with the land surface. At this point, the top surface of the deck slide 5 is flush with the top surface of the land slide 3. The pulling jacks are activated to tow the jacket 1 onto the ship. At the same time, the booster jacks 15 at the large slip shoe 14 and the small slip shoe 13 are activated to provide additional thrust, loading the jacket 1 onto the ship according to the preset loading steps. Barge 2 adjusts its load in stages to keep the top surfaces of the deck and the land slide 3 flush.

[0026] Step 7: The towing process continues until the bottom of the large slipper 14 is flush with the end of the slipway 5. After the towing is completed, the center of gravity of the super-large jacket 1 should be near the center of the barge 2. The length of its bottom protruding from the bow should be less than the length of its top protruding from the stern. The elastic deformation of the slipper caused by its own weight should be less than the change in vertical distance of the guide slider 7 arc surface.

[0027] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A design and method for loading and using an ultra-large jacket structure on a ship, characterized in that, Includes the following steps: S1: Place land slides on the land site and transport barges alongside the dock; S2: Fix the rocker arm at the stern of the barge, place the slide on the barge deck, and place the guide slider at the rear end of the last slide section. S3: Weld the bow fixation at the last section of the barge deck slipway; S4: Moor the stern of the barge to the dock and moor it. Arrange towing structures and steel strand traction systems on both sides of the large skid and install booster jacks on the top. Install booster jacks on the top of the small skid. S5: Calculate the maximum static friction force and determine the number of tension jacks, arrange the tension jacks at the slipper, and set up a temporary support platform for the power station; S6: Adjust the barge load until the deck plane is level with the land plane, start the pull jacks to drag the jacket onto the ship, and at the same time start the booster jacks at the large and small slip shoes to provide additional thrust to load the jacket onto the ship. S7: The jacket is towed and loaded onto the ship until the bottom of the large skid shoe is flush with the end of the skid. After towing, the bottom and top of the jacket protrude from the bow and stern of the ship, respectively. The jacket is then welded and fixed in place, ready to leave the port. In S2, the length and width of the guide slider are the same as those of the deck slide, and the guide slider is directly welded to the deck and fixed to the deck with the assistance of triangular rib plates; In step S3, the side of the bow is fixed and welded to the side of the last section of the slide by connecting stiffeners. The side of the bow and the rear end are welded with reinforcing triangular stiffeners. The top of the front section is fixedly connected to the steel strand of the traction system. In step S4, the length of the large slipper is less than the length of the jacket truss for water descent. In step S5, the temporary support platform of the power station should be equidistant from the tension jack.

2. The design and usage method for an ultra-large jacket structure on a ship according to claim 1, characterized in that, In step S1, the land slide needs to extend 190-210mm beyond the front edge of the dock, and the slide at the front edge of the dock should use steel slide blocks.

3. The design and usage method for an ultra-large jacket structure on a ship according to claim 1, characterized in that, In S7, the center of gravity of the jacket should be located near the center of the barge, the length of the bottom protruding from the bow should be less than the length of the top protruding from the stern, and the elastic deformation of the slipper caused by its own weight should be less than the change in vertical distance of the guide slider arc surface.

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