A turret single point mounting method

Abstract

A turret type single point installation method adopts three sets of supporting piers and two cranes to guide and install, one set of turret supporting pier, one set of pontoon supporting pier and one set of integral transfer steel supporting mandrel. Six installation guide protective rubber strips are used to protect the paint on the outer wall of the turret column and the inner wall of the pontoon, and the flat car is used for jacking installation and horizontal fine adjustment. The guide pin for auxiliary installation is used for bearing hole positioning; the flat car carries the integral transfer steel supporting mandrel to complete the field transfer of the assembly body for construction. After the construction is completed, the turret type single point assembly body is transferred to the delivery wharf, and is lifted onto the ship by the heavy lifting ship. The invention can accurately, safely, efficiently and reliably assemble the pontoon on the turret structure. The flat car is introduced to jointly transfer the integral steel supporting mandrel, and the integral transfer single point assembly body is transferred to other sites for construction, which solves the problem of lack of large cranes and enables the turret type single point to be transferred to the site for construction.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding and design, and specifically relates to a turret-type single-point installation method. Background Technology

[0002] Offshore oil, as a major source of crude oil, is receiving increasing attention. The transport of crude oil or refined petroleum products typically takes two forms: production platforms or FPSOs transport oil to tankers via single-point mooring systems; tankers, acting as "ports on the sea," transport oil products between themselves and onshore plants via single-point mooring systems.

[0003] Single-point mooring systems are divided into turret-type single-point mooring systems and turntable-type single-point mooring systems. In comparison, turret-type single-point mooring systems have the advantages of longer service life and better stability.

[0004] A turret-type single-point mooring device consists of a buoy and a turret. The buoy provides buoyancy and serves as the rotating part, while the turret is the mooring stationary part.

[0005] While turret-type single-point mooring systems have their advantages, their construction is relatively difficult. Weighing approximately 300 tons, the small radial clearance between the outer turret column (Ф4012mm) and the inner buoy cylinder (Ф4022mm), coupled with a height of approximately 4500mm and a buoy weight of 140 tons, necessitates the use of cranes to assemble the buoy and turret. The radial assembly clearance is only 10mm, posing significant challenges to precise and safe installation. The lack of superior installation techniques often necessitates repeated adjustments to complete the work, resulting in low production efficiency.

[0006] Currently, the installation methods for the floats and turrets of turret-type single-point mooring devices by the manufacturers are as follows:

[0007] 1. Construct the pontoons and turrets separately, and transport them to the loading dock for installation (because the bottom structure is complex after installation and cannot be transported as a whole, it needs to be installed at the shipping location, i.e., the dock, and subsequent construction and installation work will be carried out until the ship is loaded and shipped).

[0008] 2. The installation of the pontoon and the turret is carried out by lifting the pontoon to the top of the turret with a crane, lowering the pontoon and adjusting its center position with the crane. The adjustment is repeated while lowering the pontoon. If the inner side of the pontoon gets stuck with the turret column, the pontoon needs to be lifted again and adjusted until the pontoon is placed and installed on the turret.

[0009] 3. After installation, the top structure, piping system, and electrical instruments will be installed at the dock;

[0010] 4. After joint commissioning, the goods will be directly loaded onto ships at the dock and shipped.

[0011] As mentioned above, the installation technology is difficult to control in terms of precision, presents significant challenges, seriously affects the loading of other goods onto ships at the dock, occupies the site for a period ranging from two months to six months, impacts dock safety, and increases regulatory workload. Summary of the Invention

[0012] To solve the above problems, the present invention provides a turret-type single-point installation method, the technical solution of which is as follows:

[0013] A single-point installation method for a turret type involves a pontoon sleeved on the outside of the turret, with the top of the turret and the pontoon connected by a bearing. The main body of the turret is a vertically placed circular column with multiple outwardly extending claws distributed at the bottom of the column. Below the claws on both sides of the turret, two rows of turret support piers are symmetrically arranged. A narrow flatbed truck drives into the bottom of the turret and is positioned between the two rows of turret support piers.

[0014] Multiple wooden planks are laid on the frame of the narrow flatbed car. The multiple wooden planks are arranged in a rectangle and located at the bottom of the turret. The frame of the narrow flatbed car is raised, so that the wooden planks are wedged between the flatbed car and the turret.

[0015] The bearing has an inner ring and an outer ring, which are rotatably connected. The outer ring is fixed to the pontoon with bolts. After it is fixed, the crane lifts the pontoon and raises it to the top of the turret. The operator is located at the top of the turret. While lowering the pontoon, the operator observes whether the bottom of the pontoon is aligned with the column. If it is not aligned, the operator pushes the pontoon from inside to make fine adjustments until the bottom of the pontoon is aligned with the column.

[0016] Float support piers are placed at the bottom of the pontoon and on both sides of the turret. There are three pontoon support piers on the left side of the bottom of the pontoon and two pontoon support piers on the right side of the bottom of the pontoon. The pontoon support piers are located below the pontoon's strong structure. After the bottom of the pontoon is aligned with the column, the pontoon is continuously lowered by a crane until the distance between the inner ring of the bearing and the top of the column is 10mm-50mm. At this time, the pontoon sits on the pontoon support piers.

[0017] A positioning auxiliary pin is inserted into the bolt hole of the inner ring of the bearing. The operator uses the positioning auxiliary pin to find and align the bolt hole at the top of the column. After alignment, the positioning auxiliary pin is inserted into the bolt hole at the top of the column.

[0018] Raise the frame of the narrow flatbed truck until the top of the column contacts the inner ring of the bearing. At this point, pull out the positioning auxiliary pin, install and tighten the bolts to fix the inner ring of the bearing to the column.

[0019] The narrow flatbed truck's frame is lowered, and the narrow flatbed truck and turret support blocks are removed from the bottom of the turret. The wide flatbed truck is driven into the bottom of the turret. Wooden blocks are laid on the frame of the wide flatbed truck and under the turret. Steel support blocks are fixed on the frame of the wide flatbed truck and under the pontoons. The frame of the wide flatbed truck is then raised. The turret is supported on the frame of the wide flatbed truck by the wooden blocks, and the pontoons are supported on the frame of the wide flatbed truck by the steel support blocks. The wide flatbed truck transports the assembled pontoons and turret to the construction site in the factory area.

[0020] The above-mentioned turret-type single-point installation method is further improved by using two cranes to lift the pontoon. One crane has two lifting tools and the other crane has one lifting tool. Three lifting points are evenly spaced on the top circumference of the pontoon, and the three lifting tools are connected to the three lifting points respectively.

[0021] In a further step, the turret body of the aforementioned single-point installation method is a column with an outer diameter of Ф4012mm and a weight of 40T, and six claws are evenly distributed around the bottom of the column.

[0022] Furthermore, in the aforementioned single-point installation method for turrets, six rubber anti-wear strips are arranged at equal intervals on the outer surface of the column, with the rubber anti-wear strips positioned along the height of the column.

[0023] Furthermore, in the aforementioned turret-type single-point installation method, the inner cylinder diameter is Ф4022mm and the height is 4500mm.

[0024] Furthermore, in the above-mentioned single-point installation method for turret type, three pontoon support piers are set on the left side of the bottom of the pontoon, and two pontoon support piers are set on the right side of the bottom of the pontoon.

[0025] In a further step, the aforementioned turret-type single-point installation method involves a wide flatbed truck positioned between the left and right pontoon support piers.

[0026] Furthermore, in the aforementioned single-point installation method for turrets, the guide pin is composed of a retaining ring, a pin shaft, and welded fused metal.

[0027] Furthermore, the aforementioned turret-type single-point installation method allows for the installation and commissioning of the top structure, piping system, and electrical instruments at the factory construction site after installation.

[0028] Furthermore, the aforementioned turret-type single-point installation method allows for the overall transfer of the single-point assembly to the dock for loading and shipment via a wide flatbed truck after commissioning.

[0029] The advantages of this invention lie in its ability to precisely, safely, efficiently, and reliably assemble the pontoon onto the turret structure using a single-point installation method for turret-type structures. Furthermore, the introduction of flatbed trucks for the integrated transport of steel support supports allows for the transport of the single-point assembly to the factory site for construction. Conventional operations typically require large cranes with an effective lifting capacity of 300 tons or more to lift the assembly onto flatbed trucks for transport. Therefore, this invention solves the problem of lacking large cranes while enabling the relocation of turret-type single-point installations to different construction sites. It also allows for the completion of installation and commissioning of other structures, product pipelines, and electrical equipment even when large cranes are unavailable at construction sites or docks, saving dock space and improving production efficiency. Attached Figure Description

[0030] Figure 1 This is a front view of the completed installation of the floats and turret structure of the turret-type single-point mooring device;

[0031] Figure 2 This is a top view of the completed installation of the buoy and turret structure of the turret-type single-point mooring device;

[0032] Figure 3 This is a front view of the turret support status;

[0033] Figure 4 This is a top view of the turret support configuration;

[0034] Figure 5 This is a front view of the arrangement of the protective rubber sheeting on the turret column;

[0035] Figure 6 This is a top view of the arrangement of the protective rubber sheeting on the turret pillars;

[0036] Figure 7 This is a front view of a flatbed truck driving into the bottom of the turret for installation and lifting preparation.

[0037] Figure 8 This is a top view of a flatbed truck driving into the bottom of the turret for installation and lifting preparation;

[0038] Figure 9 This is a diagram illustrating the lifting of the pontoons;

[0039] Figure 10 This is a top view of the pontoon structure;

[0040] Figure 11 This is a front view of the pontoon and turret aligned.

[0041] Figure 12 This is a top view of the pontoon and turret aligned.

[0042] Figure 13 This is a front view of the guide pin;

[0043] Figure 14 This is a top view of the guide pin;

[0044] Figure 15 This is a diagram illustrating the alignment and use of guide pins;

[0045] Figure 16 This is a schematic diagram of the guide pin structure;

[0046] Figure 17 This is a schematic diagram of the guide pin for raising the turret to its final position;

[0047] Figure 18 This is a schematic diagram of the bearing inner ring bolt installation;

[0048] Figure 19 Front view of the support piers used for transporting the assembly to the factory construction site;

[0049] Figure 20 Top view of the support piers used for transporting the assembly to the factory construction site;

[0050] Figure 21 This is a schematic diagram showing the bearing connection between the turret and the pontoon;

[0051] In the diagram, 1-turret, 1.1-column, 2-pontoon, 3-bearing, 3.1-bearing outer ring, 3.2-bearing inner ring, 3.3-bolt, 4-pontoon support pier, 5-turret support pier, 6-anti-wear strip, 7-narrow flatbed cart, 8-wooden plank, 9-crane hook, 10-lifting tool, 11-lifting point, 12-, 13-operator, 14-positioning auxiliary pin, 14.1-grip, 14.2-welded metal, 14.3-pin, 15-wide flatbed cart, 16-wooden pad, 17-integral transfer steel support upset. Detailed Implementation

[0052] The invention will be further described with reference to the accompanying drawings.

[0053] A turret-type single-point installation method, such as Figure 1 , 2 As shown, the float 2 is fitted outside the turret 1, and the top of the turret and the float are connected by a bearing 3, as shown. Figure 3 , 4 As shown, the turret 1, once completed, was transported to the installation site using a narrow flatbed truck 7 and placed on the turret support piers 5, ready for installation. The main body of the turret is a circular column 1.1 with an outer diameter of Ф4012mm and a weight of 40T. Six claws are evenly spaced around the bottom of the column. Below the claws on both sides of the turret, two rows of turret support piers 5 are symmetrically arranged, totaling six turret support piers, three on each side. Figure 5 , 6As shown, six rubber anti-wear strips 6 are arranged at equal intervals on the outer surface of the column. The rubber anti-wear strips are set along the height direction of the column. They play a protective role when the float 2 is hoisted and assembled onto the turret 1 from top to bottom, preventing the inner cylinder of the float 2 from rubbing against the column of the turret 1 and damaging the surface paint. After installation and commissioning, they prevent the substrate from rusting due to the damage to the surface paint and contact with seawater.

[0054] The narrow flatbed truck 7 drives into the bottom of the turret 1, positioned between the two rows of turret support piers 5. (As shown) Figure 7 , 8 As shown, 18 wooden planks 8 are laid on the frame of the narrow flatbed cart. Multiple wooden planks form a rectangle around the bottom of the turret to improve the stability of the support. The frame of the narrow flatbed cart is lifted up, and the wooden planks are wedged between the flatbed cart and the turret. Due to the lifting force of the top of the flatbed cart, the wooden planks 8 can make close contact between the contact surfaces, so that the flatbed cart 7 is subjected to balanced force.

[0055] like Figure 9 , 10 The float 2 shown weighs approximately 140 tons. The inner cylinder, which mates with the turret structure, has a diameter of Ф4022mm and a height of 4500mm. To prevent jamming during the installation of the turret 1 and float 2, two cranes are used to lift the float 2. One crane has two lifting devices 10, and the other crane has one lifting device 10. Three lifting points 11 are evenly spaced around the top of the float. The three lifting devices are connected to the three lifting points respectively to adjust the level of the cylinder in the air. The crane hook 9 is moved to move the float 2 above the turret 1.

[0056] Figure 21 The diagram shows the bearing 3 in its installed state after the turret 1 and float 2 are assembled. The outer ring 3.1 of the bearing is connected to the float 2 via bolts 3.3; the inner ring 3.2 of the bearing is connected to the turret 1 via bolts 3.3. The outer ring 3.1 and the inner ring 3.2 of the bearing can achieve circumferential relative movement, thereby driving the turret 1 and float 2 to perform circumferential relative movement. The connection between the outer ring 3.1 of the bearing and the float 2 is completed before using two cranes to lift the float 2.

[0057] The bearing consists of an inner ring and an outer ring, which are rotatably connected. The outer ring is fixed to the pontoon with bolts. After fixing, a crane lifts the pontoon and raises it to the top of the turret. Figure 11 , 12 As shown, the operator is positioned at the top of the turret. While lowering the pontoon, the operator observes whether the bottom of the pontoon is aligned with the column. If misalignment occurs, the operator pushes the pontoon from inside to make minor adjustments until the bottom of the pontoon is aligned with the column.

[0058] Float support piers 4 are placed at the bottom of the pontoon and on both sides of the turret, such as... Figure 13-16As shown, three pontoon support piers are set on the left side of the bottom of the pontoon, and two pontoon support piers are set on the right side of the bottom of the pontoon. The pontoon support piers are located below the pontoon's strong structure. After the bottom of the pontoon is aligned with the column, the pontoon is continuously lowered using a crane. At this time, the gap between the inner ring 3.2 of the bearing 3 and the top of the turret must meet the requirements of the remaining length of the positioning auxiliary pin 14 and the remaining lifting height of the narrow flatbed trolley 7, which is generally 10-50mm. Stop when the distance between the inner ring of the bearing and the top of the column is 10mm-50mm. At this time, the pontoon sits on the pontoon support pier.

[0059] The guide pin consists of a retaining ring 14.1, a pin shaft 14.3, and welded metal 14.2.

[0060] Insert a positioning auxiliary pin into the bolt hole of the bearing inner ring to align the bolt hole 3.2 on the bearing inner ring with the bolt hole on the upper surface of the turret. The operator uses the positioning auxiliary pin to locate and align the bolt hole at the top of the column. After alignment, insert the positioning auxiliary pin into the bolt hole at the top of the column.

[0061] Raise the frame of the narrow flatbed truck until the top of the upright contacts the inner ring of the bearing, as follows. Figure 17 As shown, at this point, pull out the positioning auxiliary pin, install and tighten the bolts to fix the bearing inner ring to the column (e.g., Figure 18 (As shown).

[0062] like Figure 19 , 20 As shown, the narrow flatbed truck's frame is lowered, removing the narrow flatbed truck and turret support blocks from the bottom of the turret. The wide flatbed truck then drives into the bottom of the turret, positioned between the pontoon support blocks on both sides of the pontoon. Wooden blocks 16 are laid on the frame of the wide flatbed truck and under the turret. Steel support blocks 17 are fixed on the frame of the wide flatbed truck and under the pontoon. The frame of the wide flatbed truck is then raised, with the turret supported on the frame of the wide flatbed truck via the wooden blocks. The pontoon is also supported on the frame of the wide flatbed truck via the steel support blocks. The wide flatbed truck then transports the assembled pontoon and turret assembly to the factory construction site. In this way, the wide flatbed truck 15 supports the turret 1 via the wooden blocks 16 and supports the pontoon 2 via the overall transport steel support blocks 17, ensuring that the entire assembly is completely supported on the body of the wide flatbed truck 15.

Claims

1. A turret-type single-point installation method, characterized in that, The pontoon is fitted over the outside of the turret, and the top of the turret and the pontoon are connected by bearings. The main body of the turret is a vertically placed circular column with multiple outward-extending claws at the bottom of the column. Below the claws on both sides of the turret, there are two rows of turret support piers symmetrically arranged. A narrow flatbed truck drives into the bottom of the turret and is located between the two rows of turret support piers. Multiple wooden planks are laid on the frame of the narrow flatbed car. The multiple wooden planks are arranged in a rectangle and located at the bottom of the turret. The frame of the narrow flatbed car is raised, so that the wooden planks are wedged between the flatbed car and the turret. The bearing has an inner ring and an outer ring, which are rotatably connected. The outer ring is fixed to the pontoon by bolts. After it is fixed, the crane lifts the pontoon to the top of the turret. The operator is located at the top of the turret. While lowering the pontoon, the operator observes whether the bottom of the pontoon is aligned with the column. If there is any misalignment, the operator pushes the pontoon from inside to make fine adjustments until the bottom of the pontoon is aligned with the column. Float support piers are placed at the bottom of the pontoon and on both sides of the turret. There are three pontoon support piers on the left side of the bottom of the pontoon and two pontoon support piers on the right side of the bottom of the pontoon. The pontoon support piers are located below the pontoon's strong structure. After the bottom of the pontoon is aligned with the column, the pontoon is continuously lowered by a crane until the distance between the inner ring of the bearing and the top of the column is 10mm-50mm. At this time, the pontoon sits on the pontoon support piers. Insert a positioning auxiliary pin into the bolt hole of the inner ring of the bearing. The operator uses the positioning auxiliary pin to find and align the bolt hole at the top of the column. After alignment, insert the positioning auxiliary pin into the bolt hole at the top of the column. Raise the frame of the narrow flatbed truck until the top of the column contacts the inner ring of the bearing. At this point, pull out the positioning auxiliary pin, install and tighten the bolts to fix the inner ring of the bearing to the column. The narrow flatbed truck's frame is lowered, and the narrow flatbed truck and turret support blocks are removed from the bottom of the turret. The wide flatbed truck is driven into the bottom of the turret. Wooden blocks are laid on the frame of the wide flatbed truck and under the turret. Steel support blocks are fixed on the frame of the wide flatbed truck and under the pontoons. The frame of the wide flatbed truck is then raised. The turret is supported on the frame of the wide flatbed truck by the wooden blocks, and the pontoons are supported on the frame of the wide flatbed truck by the steel support blocks. The wide flatbed truck transports the assembled pontoons and turret to the construction site in the factory area.

2. The turret-type single-point installation method according to claim 1, characterized in that, Two cranes are used to lift the pontoons. One crane has two lifting devices and the other crane has one lifting device. There are three lifting points evenly spaced around the top of the pontoons, and the three lifting devices are connected to the three lifting points respectively.

3. The turret-type single-point installation method according to claim 1, characterized in that, The main body of the turret is a column with an outer diameter of Ф4012mm and a weight of 40T. There are 6 claws evenly distributed around the bottom of the column.

4. The turret-type single-point installation method according to claim 1, characterized in that, Six rubber anti-wear strips are arranged at equal intervals on the outer surface of the column, with the rubber anti-wear strips set along the height direction of the column.

5. The turret-type single-point installation method according to claim 1, characterized in that, The inner cylinder has a diameter of Ф4022mm and a height of 4500mm.

6. The turret-type single-point installation method according to claim 1, characterized in that, There are three pontoon support piers on the left side of the bottom of the pontoon, and two pontoon support piers on the right side of the bottom of the pontoon.

7. A turret-type single-point installation method according to claim 6, characterized in that, The wide flatbed truck is located between the float support piers on the left and right sides of the float.

8. A turret-type single-point installation method according to claim 1, characterized in that, The guide pin consists of a retaining ring, a pin shaft, and welded metal.

9. A turret-type single-point installation method according to claim 1, characterized in that, After installation, the top structure, piping system and electrical instruments will be installed and tested at the construction site in the factory area.

10. A turret-type single-point installation method according to claim 9, characterized in that, After joint commissioning, the individual assembly units are transported as a whole to the dock for loading and shipment via wide flatbed trucks.

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