Offshore joining system and offshore joining method

Abstract

The present invention provides an offshore joining system, an offshore joining chamber, and an offshore joining method that enable easy joining of floating structures at sea. [Solution] The offshore joining system 1 comprises a floating structure 2 having a weld line 3 on its bottom 2b which sinks into the sea, and a chamber 10 attached to the bottom 2b of the floating structure 2 and forming a dry space surrounding the weld line 3. The bottom 2b of the floating structure 2 is provided with a guide mechanism 50 along the weld line 3, and the chamber 10 is provided with a sliding mechanism 60 that can slide along the guide mechanism 50. At least one of the guide mechanism 50 and the sliding mechanism 60 includes a wire.

Description

Technical Field

[0001] The present invention relates to an offshore joining system, an offshore joining chamber, and an offshore joining method.

Background Art

[0002] In recent years, in order to effectively utilize marine space in wind power generation and the like, it has been planned to construct large floating structures by joining floating structures to each other offshore. As a chamber device used for such an offshore joining operation of floating structures, Patent Document 1 below discloses a chamber device for welding the weld line portion of the bottom plate of a large marine structure in a dry space state.

[0003] This chamber device attaches two guide rails along both sides of the weld line on the bottom plate of the floating structure, and provides a box-shaped bottom chamber with an upper surface opening that can be moved by rollers under the lower surface of the bottom plate along the guide rails. At the same time, the bottom chamber is pressed and fixed to the lower surface of the bottom plate through a water stop material via each fixing jig attached to the lower surface of the bottom plate, the guide rails, and the bottom chamber.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, at sea, the floating structure and bottom chamber are affected by waves and currents, causing them to sway and potentially leading to severe interference between the guide rails and rollers, which could result in damage to one or the other. Furthermore, preventing the rollers from detaching from the guide rails requires a complex roller configuration, which reduces robustness when considering repeated operation. Additionally, when retracting the bottom chamber into the underside of the hull plate, precise underwater alignment is required to align the leading roller of the bottom chamber with the guide rail, making the procedure complicated and placing a heavy burden on the divers.

[0006] This invention has been made in view of the above-mentioned problems, and aims to provide an offshore joining system, an offshore joining chamber, and an offshore joining method that can facilitate the joining of floating structures at sea. [Means for solving the problem]

[0007] To solve the above problems, an offshore joining system according to a first aspect of the present invention comprises a floating structure having a weld line at its bottom which is submerged in the sea, and a chamber attached to the bottom of the floating structure and forming a dry space surrounding the weld line, wherein a guide mechanism is provided at the bottom of the floating structure along the weld line, and a sliding mechanism capable of sliding along the guide mechanism is provided in the chamber, and at least one of the guide mechanism and the sliding mechanism includes a wire.

[0008] A second aspect of the present invention is an offshore joining system according to the first aspect, wherein the guide mechanism comprises a first wire erected along the weld line, and the sliding mechanism comprises an engaging piece that movably engages with the first wire, and a second wire connected to the engaging piece and suspending the chamber.

[0009] A third aspect of the present invention is the offshore joining system of the second aspect, which may be further provided with a retraction device connected to the engaging piece for retracting the chamber into the bottom of the floating structure.

[0010] A fourth aspect of the present invention is an offshore joining system in any one of the first to third aspects, wherein the chamber may include a bottom chamber attached to the bottom of the floating structure and a side chamber connected to the bottom chamber and extending above the sea surface.

[0011] A fifth aspect of the present invention is the offshore joining system of the fourth aspect, wherein the bottom chamber may be divided into a plurality of chamber units.

[0012] A sixth aspect of the present invention is an offshore joining system according to the fourth or fifth aspect, wherein a dividing line is provided between the bottom chamber and the side chamber, and the dividing line may be inclined downward as it moves away from the floating structure in the horizontal direction.

[0013] A seventh aspect of the present invention is an offshore bonding system in any one of the first to sixth aspects, wherein the chamber may be provided with a reinforcing structure protruding from the outer surface opposite to the inner surface that forms the dry space.

[0014] An offshore joining chamber according to an eighth aspect of the present invention comprises a chamber body having an opening at least at the top, a wire with one end connected to the inner surface of the chamber body, and an engaging piece connected to the other end of the wire.

[0015] An offshore joining method according to a ninth aspect of the present invention includes a wire installation step of installing a wire along a weld line at the bottom of a floating structure; a chamber installation step of sliding a chamber along the wire and pulling the chamber into and attaching it to the bottom of the floating structure; and a dry space formation step of draining seawater from inside the chamber and forming a dry space surrounding the weld line. [Effects of the Invention]

[0016] According to one aspect of the present invention, it is possible to provide an offshore joining system, an offshore joining chamber, and an offshore joining method that can easily join floating structures offshore.

Brief Description of the Drawings

[0017] [Figure 1] It is an overall schematic diagram of an offshore joining system according to an embodiment. [Figure 2] It is a front view of an offshore joining system according to an embodiment. [Figure 3] It is a view taken along the arrow III-III shown in FIG. 2. [Figure 4] It is an explanatory diagram of an offshore joining method according to an embodiment. [Figure 5] It is an explanatory diagram of an offshore joining method according to an embodiment. [Figure 6] It is an explanatory diagram of an offshore joining method according to an embodiment. [Figure 7] It is a plan view of the region A shown in FIG. 6 as seen from above. [Figure 8] It is an explanatory diagram of an offshore joining method according to an embodiment. [[ID=3e]] [Figure 9] It is an explanatory diagram of an offshore joining method according to an embodiment. } [Figure 10] It is an explanatory diagram of an offshore joining method according to an embodiment. [Figure 11] It is an explanatory diagram of an offshore joining method according to an embodiment. [Figure 12] It is an explanatory diagram of an offshore joining method according to an embodiment. [Figure 13] It is a front view of an offshore joining system according to a modification of an embodiment.

Modes for Carrying Out the Invention

[0018] Hereinafter, the offshore joining system, the offshore joining chamber, and the offshore joining method of the present embodiment will be described based on the drawings.

[0019] FIG. 1 is an overall schematic diagram of an offshore joining system 1 according to an embodiment. As shown in Figure 1, the offshore joining system 1 comprises a floating structure 2 floating on the sea surface 100 and a chamber 10 fitted so as to surround the submerged portion of the weld line 3 (joint) of the floating structure 2.

[0020] The floating structure 2 comprises a first floating body 2A and a second floating body 2B. The first floating body 2A and the second floating body 2B are positioned with their joint surfaces butted together horizontally. The chamber 10 has a U-shape or C-shape opening upwards and is in contact with the bottom 2b and side 2c of the floating structure 2. The chamber 10 has a tunnel-shaped duct structure and forms a dry space surrounding the weld line 3 of the floating structure 2.

[0021] Figure 2 is a front view of an offshore joining system 1 according to one embodiment. Figure 3 is a view taken along the line III-III shown in Figure 2. As shown in Figure 2, the chamber 10 comprises a bottom chamber 20 attached to the bottom 2b of the floating structure 2, and a pair of side chambers 30 connected to the bottom chamber 20 and extending above the sea surface 100.

[0022] As shown in Figure 3, the bottom chamber 20 comprises a bottom opposing wall 21 that faces the bottom 2b of the floating structure 2 with a gap (dry space) between them, and a pair of bottom side walls 22 that are erected from the bottom opposing wall 21 toward the bottom 2b of the floating structure 2. The bottom opposing wall 21 extends horizontally along the weld line 3 of the bottom 2b of the floating structure 2. The pair of bottom side walls 22 extend vertically upward from both ends of the bottom opposing wall 21 in the width direction.

[0023] A pair of bottom side walls 22 are provided with watertight packings 23 that contact the bottom 2b of the floating structure 2 at their upper edges. The bottom chamber 20 is equipped with a reinforcing structure 24 that protrudes outward from the inner surface which forms the dry space. The reinforcing structure 24 comprises a plurality of first ribs 24a and a plurality of second ribs 24b. The first ribs 24a and the second ribs 24b form a plate frame structure that intersects vertically and horizontally.

[0024] A float 25 is attached to the outer surface of the bottom chamber 20. The float 25 adjusts the buoyancy of the bottom chamber 20. A hoisting mechanism 70 is located on the inner surface of the bottom chamber 20, which lifts the bottom chamber 20 and brings it into contact with the bottom 2b of the floating structure 2. The hoisting mechanism 70 includes a fixed wire 71 fixed to the bottom 2b of the floating structure 2, and a hoisting machine 72 that winds up the fixed wire 71.

[0025] The hoisting machine 72 is fixed to the inner surface of the bottom chamber 20 and is equipped with a lever for manual operation. By turning the lever of the hoisting machine 72, the fixed wire 71 fixed to the bottom 2b of the floating structure 2 can be reeled in. This raises the bottom chamber 20 and presses the watertight packing 23 against the bottom 2b of the floating structure 2. Note that the hoisting machine 72 is not limited to manual operation; it may also be configured to use other power sources, such as electric winding.

[0026] As shown in Figure 2, the bottom chamber 20 is divisible into chamber units 20A and 20B. The chamber units 20A and 20B are positioned with their connecting surfaces 12 abutting horizontally. The chamber units 20A and 20B are connected via bolts or the like. This configuration allows the bottom chamber 20 to be divided for storage and transport, thereby improving storage and transport efficiency.

[0027] The side chamber 30 comprises a side opposing wall 31 that faces the side 2c of the floating structure 2 with a gap (dry space) between them, and a pair of side walls 32 that extend from the side opposing wall 31 toward the side 2c of the floating structure 2. The side opposing wall 31 extends vertically along the weld line 3 of the side 2c of the floating structure 2. The pair of side walls 32 extend horizontally from both ends of the side opposing wall 31 toward the side 2c of the floating structure 2.

[0028] A watertight packing 33 is provided at the vertically extending edges of a pair of side walls 32, which contacts the side portion 2c of the floating structure 2. The side chamber 30 is also provided with a reinforcing structure 34 that protrudes outward from the inner surface which forms the dry space. The reinforcing structure 34 comprises a plurality of first ribs 34a and a plurality of second ribs 34b. The first ribs 34a and the second ribs 34b form a plate frame structure that intersects vertically and horizontally.

[0029] A ladder 35 is provided inside the side chamber 30. This allows a person to descend from the upper part 2a of the floating structure 2 through the inside of the side chamber 30 to the bottom chamber 20. A dividing line 11 is provided between the bottom chamber 20 and the side chamber 30. The dividing line 11 slopes downward as it moves away from the floating structure 2 in the horizontal direction. The bottom chamber 20 and the side chamber 30 are connected at the dividing line 11 by bolts or the like. A hoisting mechanism (not shown) similar to the hoisting mechanism 70 of the bottom chamber 20 is also provided inside the side chamber 30.

[0030] As shown in Figure 3, a guide mechanism 50 is provided at the bottom 2b of the floating structure 2. The guide mechanism 50 comprises a first wire 51 that is installed along the weld line 3 of the bottom 2b of the floating structure 2. The first wire 51 is provided in pairs and extends parallel to the weld line 3. The chamber 10 is provided with a sliding mechanism 60 that can slide along the guide mechanism 50.

[0031] The sliding mechanism 60 includes an engaging piece 61 that movably engages with the first wire 51, and a second wire 62 connected to the engaging piece 61 and suspending the chamber 10. A shackle can be an example of the engaging piece 61. The engaging piece 61 may also be a hook, as long as it can engage with the first wire 51. It is preferable that the engaging piece 61 does not detach from the first wire 51 due to rocking in the sea, so a closed annular member such as a shackle is preferred.

[0032] The second wire 62 is fixed to the inner surface of the bottom side wall 22. The engaging piece 61 and the second wire 62 are provided in pairs corresponding to the pair of first wires 51. A retraction device 40 is provided on the upper part 2a of the floating structure 2. The retraction device 40 comprises a winch 41 and a retraction wire 42 that is unwound from the winch 41 and connected to the engaging piece 61. As shown in Figure 7, which will be described later, the retraction wire 42 branches into a first wire end 43a and a second wire end 43b, and is connected to the pair of engaging pieces 61.

[0033] Next, an offshore joining method using the offshore joining system 1 with the above configuration will be explained with reference to Figures 4 to 12. Figures 4-6 and 8-12 are explanatory diagrams of an offshore joining method according to one embodiment. Figure 7 is a plan view of region A shown in Figure 6, viewed from above.

[0034] In this method, first, as shown in Figure 4, a pull-in jig 44 is installed on the upper part 2a of the floating structure 2 to guide the pull-in wire 42. The pull-in jig 44 is equipped with a pulley and guides the pull-in wire 42 down to the bottom part 2b of the floating structure 2. A shackle 46 (see Figure 7), which will be described later, is attached to the end 45 of the pull-in wire 42.

[0035] Next, as shown in Figure 5, the first wire 51 is erected along the joint surface of the bottom 2b of the floating structure 2 (wire erection process). The erection of the first wire 51 is performed by divers. Note that the erection of the first wire 51 may be done on land or elsewhere before the launch of the floating structure 2. In addition to the first wire 51, the installation of the retraction device 40 may also be done before the launch of the floating structure 2. Next, the bottom chamber 20 is lifted by the crane wire 201 and the bottom chamber 20 is lowered into the sea in a horizontal position.

[0036] Next, as shown in Figure 6, the crane wire 201 is moved to insert the end of the bottom chamber 20 into the underside of the floating structure 2. Once the bottom chamber 20 reaches the predetermined position, the engaging piece 61 of the sliding mechanism 60 provided in the bottom chamber 20 is engaged with the first wire 51. A hoisting mechanism 70 (see Figure 3) is installed inside the bottom chamber 20.

[0037] As shown in Figure 7, the pull-in wire 42 is attached to the engaging piece 61 by attaching the first wire end 43a and the second wire end 43b, which extend in a Y-shape from the shackle 46, to the pair of engaging pieces 61. The attachment of the pull-in wire 42 to the engaging piece 61, and the attachment of the engaging piece 61 to the first wire 51, are performed by a diver. The guide mechanism 50 and the planing mechanism 60 include wires (first wire 51, second wire 62) that are easy to handle underwater, making the installation process easy.

[0038] Next, as shown in Figure 8, the bottom chamber 20 is slid along the first wire 51 in a zipline manner, and the bottom chamber 20 is pulled under the bottom 2b of the floating structure 2. The bottom chamber 20 is pulled under the bottom 2b of the floating structure 2 by driving the winch 41 and winding up the pull-in wire 42. At this time, it is preferable to change the lifting point of the crane wire 201 and move the crane wire 201 in accordance with the pulling in of the bottom chamber 20.

[0039] Since the guide mechanism 50 and the sliding mechanism 60 include wires (first wire 51, second wire 62), even if at least one of the floating structure 2 and the bottom chamber 20 is affected by waves or ocean currents and oscillates, the wires (first wire 51, second wire 62) move flexibly in response to the oscillation. This prevents the engagement of the guide mechanism 50 and the sliding mechanism 60 from becoming disengaged or damaged.

[0040] Furthermore, as shown in Figure 7, by connecting the pull-in wire 42 to the engaging piece 61 instead of the bottom chamber 20, the point of force application (the pulling force of the pull-in wire 42) and the point of application (the suspension point of the bottom chamber 20) can be made the same, which significantly increases the pulling efficiency of the bottom chamber 20. This makes it possible to avoid a so-called "stick" condition, for example, where the engaging piece 61 gets caught on the first wire 51 and becomes immobile.

[0041] As shown in Figure 9, after the bottom chamber 20 is pulled in below the bottom 2b of the floating structure 2, the bottom chamber 20 is raised and attached to the bottom 2b of the floating structure 2 (chamber attachment process). In this process, first, the underwater weight is adjusted by filling and draining ballast water that has been previously injected from the float 25 (see Figure 3) that was attached before the bottom chamber 20 was launched. After adjusting the underwater weight of the bottom chamber 20, the crane wire 201 is removed.

[0042] Next, the lever of the hoisting machine 72 (see Figure 3) of the hoisting mechanism 70 is operated to wind up the fixed wire 71. This allows the bottom chamber 20 to be attached to the bottom 2b of the floating structure 2 with the watertight packing 23 pressed against it. Once the bottom chamber 20 is attached to the bottom 2b of the floating structure 2, the pulling jig 44 is removed using the crane wire 201, as shown in Figure 9.

[0043] Next, as shown in Figure 10, the side chamber 30 is suspended by the crane wire 201 and lowered vertically into the sea. The crane wire 201 is then used to move the side chamber 30 towards the side 2c of the floating structure 2, bringing the side chamber 30 close to or in contact with the bottom chamber 20. The side chamber 30 is then connected to the bottom chamber 20 with bolts or the like. Alternatively, after lowering the side chamber 30 vertically into the sea, the crane wire 201 may be used to move the side chamber 30 towards the side 2c of the floating structure 2, bringing the side chamber 30 close to or in contact with the bottom chamber 20.

[0044] Next, a hoisting mechanism (not shown) inside the side chamber 30 pulls the side chamber 30 towards the side 2c of the floating structure 2, compressing the watertight packing 33. Once the side chamber 30 is attached to the side 2c of the floating structure 2 in this manner, the crane wire 201 is removed. Next, in the same manner as shown in Figure 11, the side chamber 30 on the opposite side is connected to the bottom chamber 20 and attached to the side 2c of the floating structure 2.

[0045] Next, as shown in Figure 12, a drainage pump 80 is installed to drain the seawater from inside the chamber 10 and create a dry space surrounding the weld line 3 (dry space formation process). Divers visually check for any gaps in the watertight packings 23 and 33. If there are gaps in the watertight packings 23 and 33, watertight treatment is performed by filling the gaps with packing material. Once a dry space is formed inside the chamber 10 as described above, an automatic welding machine or the like is introduced inside the chamber 10 to join the floating structures 2.

[0046] As described above, the offshore joining system 1 according to this embodiment comprises a floating structure 2 having a weld line 3 on its bottom 2b which is submerged in the sea, and a chamber 10 attached to the bottom 2b of the floating structure 2 and forming a dry space surrounding the weld line 3. The bottom 2b of the floating structure 2 is provided with a guide mechanism 50 along the weld line 3, and the chamber 10 is provided with a sliding mechanism 60 that can slide along the guide mechanism 50, and at least one of the guide mechanism 50 and the sliding mechanism 60 includes a wire. With this configuration, even if at least one of the floating structure 2 and the bottom chamber 20 is shaken by the influence of waves or ocean currents, the wires (first wire 51, second wire 62) move flexibly in response to the shaking, so that the engagement of the guide mechanism 50 and the sliding mechanism 60 does not become disengaged or break.

[0047] Furthermore, in this embodiment, the guide mechanism 50 includes a first wire 51 installed along the weld line 3, and the sliding mechanism 60 includes an engaging piece 61 that movably engages with the first wire 51, and a second wire 62 connected to the engaging piece 61 and suspending the chamber 10. With this configuration, the bottom chamber 20 can be slid along the first wire 51 in a zipline manner and pulled under the bottom 2b of the floating structure 2.

[0048] Furthermore, in this embodiment, a retraction device 40 is provided, which is connected to the engaging piece 61 and retracts the chamber 10 into the bottom 2b of the floating structure 2. With this configuration, as shown in Figure 7, by connecting the retraction wire 42 to the engaging piece 61 instead of the bottom chamber 20, the point of force application (the retraction force of the retraction wire 42) and the point of application (the suspension point of the bottom chamber 20) can be made the same, so the retraction efficiency of the bottom chamber 20 is greatly increased.

[0049] Furthermore, in this embodiment, the chamber 10 comprises a bottom chamber 20 attached to the bottom 2b of the floating structure 2, and a side chamber 30 connected to the bottom chamber 20 and extending above the sea surface 100. With this configuration, the chamber 10 can be installed so as to surround the submerged portion of the weld line 3 of the floating structure 2.

[0050] Furthermore, in this embodiment, the bottom chamber 20 can be divided into multiple chamber units 20A and 20B. With this configuration, the bottom chamber 20 can be divided for storage and transport, thus improving storage and transport efficiency.

[0051] Furthermore, in this embodiment, a dividing line 11 is provided between the bottom chamber 20 and the side chamber 30, and the dividing line 11 is inclined downward as it moves away from the floating structure 2 in the horizontal direction. With this configuration, as shown in Figure 6, when the bottom chamber 20 is pulled in below the bottom 2b of the floating structure 2, the end of the bottom chamber 20 is less likely to collide with the bottom 2b of the floating structure 2. Also, as shown in Figures 10 and 11, when the side chamber 30 is brought against the side 2c of the floating structure 2, it is not necessary to move the side chamber 30 up and down, so vertical shear force is not applied to the watertight packing 33, thus improving watertightness.

[0052] Furthermore, in this embodiment, the chamber 10 is equipped with reinforcing structures 24 and 34 that protrude from the outer surface opposite to the inner surface that forms the dry space. With this configuration, as shown in Figure 3, the dry space inside the chamber 10 can be used more widely, thereby improving work efficiency.

[0053] Furthermore, the chamber 10 (offshore joining chamber) according to this embodiment comprises a chamber body with at least an opening at the top, a second wire 62 (wire) with one end connected to the inner surface of the chamber body, and an engaging piece 61 connected to the other end of the second wire 62. With this configuration, the chamber 10 can be slid in a zipline manner and pulled under the bottom 2b of the floating structure 2.

[0054] Furthermore, the offshore joining method according to this embodiment includes a wire installation step of installing a first wire 51 along the welding line 3 of the bottom 2b of the floating structure 2, a chamber installation step of sliding the chamber 10 along the first wire 51 and pulling the chamber 10 into place on the bottom 2b of the floating structure 2, and a dry space formation step of draining the seawater from inside the chamber 10 to form a dry space surrounding the welding line 3. With this configuration, the joining of the floating structure 2 at sea can be easily performed because it is less susceptible to the effects of waves and ocean currents, resulting in high robustness and reduced load on divers.

[0055] While preferred embodiments of the present invention have been described and explained above, it should be understood that these are illustrative and should not be considered limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the invention. Therefore, the present invention should not be considered limited by the foregoing description, but rather limited by the claims.

[0056] For example, the following configuration may be adopted. Figure 13 is a front view of an offshore joining system 1 according to a modified example of one embodiment. As shown in Figure 13, the dividing line 11 between the bottom chamber 20 and the side chamber 30 may be inclined upward as it moves away from the floating structure 2 in the horizontal direction. With this configuration, when connecting the side chamber 30 to the bottom chamber 20, the inclination of the dividing line 11 makes it easier to press the side chamber 30 against the side portion 2c of the floating structure 2.

[0057] Furthermore, although the above embodiment describes a configuration in which the guide mechanism 50 is equipped with a first wire 51 and the sliding mechanism 60 is equipped with a second wire 62, the configuration is not limited to this. For example, the guide mechanism 50 may be equipped with a guide member that is easily deformable, such as a round bar, instead of the first wire 51. Also, when the guide mechanism 50 is equipped with a first wire 51, the sliding mechanism 60 may be equipped only with an engaging piece 61, and the engaging piece 61 may be rigidly fixed to the bottom chamber 20. In this case, the first wire 51 of the guide mechanism 50 and the engaging piece 61 of the sliding mechanism 60 are connected.

[0058] Furthermore, in the above embodiment, the chamber 10 had two side chambers 30 and was in a U-shape or C-shape that opened upwards, but the configuration is not limited to this. For example, the chamber 10 may have one side chamber 30 and be in an L-shape.

[0059] Furthermore, without departing from the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments and modifications may be combined as appropriate. [Explanation of Symbols]

[0060] 1. Offshore joining system 2. Floating structures 2a upper part 2A First Floating Body 2b bottom 2B Second floating body 2c Side 3 Weld lines 10 chambers 11 dividing lines 12 Connecting surface 20 Bottom Chambers 20A Chamber Unit 20B Chamber Unit 21 Bottom opposing wall 22 Bottom side wall 23. Water-stopping packing 24 Reinforcement structure 24a First Rib 24b Second Rib 25 floats 30 Side Chambers 31 Side opposing wall 32 Side walls 33. Water-stopping packing 34 Reinforcement structure 34a First Rib 34b Second Rib 35 Ladder 40 Pull-in device 41 Winch 42 wires 43a First wire end 43b Second wire end 44 Pulling jig 45 End 46 Shackles 50 Guide mechanism 51 First Wire 60 Sliding mechanism 61 Engaging piece 62. Second wire 70 Hoisting mechanism 71 Fixing wire 72 Hoisting machine 80 Drainage pump 100 sea level 201 Crane Wire

Claims

1. A floating structure with welded lines on its bottom that sinks into the sea, The floating structure comprises a chamber attached to the bottom of the floating structure and forming a dry space surrounding the weld line, A guide mechanism is provided at the bottom of the floating structure along the weld line. The chamber is provided with a sliding mechanism that can slide along the guide mechanism, At least one of the guide mechanism and the sliding mechanism includes a wire, Offshore joining system.

2. The guide mechanism comprises a first wire installed along the weld line, The aforementioned sliding mechanism is An engaging piece that movably engages with the first wire, A second wire connected to the engaging piece and suspending the chamber is provided, The offshore joining system according to claim 1.

3. It is connected to the engaging piece and includes a retraction device that pulls the chamber into the bottom of the floating structure, The offshore joining system according to claim 2.

4. The aforementioned chamber A bottom chamber attached to the bottom of the floating structure, It comprises a side chamber connected to the bottom chamber and extending above sea level, An offshore joining system according to any one of claims 1 to 3.

5. The bottom chamber can be divided into multiple chamber units. The offshore joining system according to claim 4.

6. A dividing line is provided between the bottom chamber and the side chamber. The dividing line is inclined downwards as it moves away from the floating structure in the horizontal direction. The offshore joining system according to claim 5.

7. The chamber is provided with a reinforcing structure that protrudes from the outer surface side opposite to the inner surface side that forms the dry space. An offshore joining system according to any one of claims 1 to 3.

8. A chamber body with at least an opening at the top, A wire with one end connected to the inner surface of the chamber body, The wire comprises an engaging piece connected to the other end of the wire, Chamber for offshore joining.

9. The wire installation process involves installing wires along the weld lines at the bottom of the floating structure, A chamber installation step involves sliding the chamber along the wire and pulling the chamber into the bottom of the floating structure to attach it, The process includes a step of forming a dry space by draining the seawater from inside the chamber and forming a dry space surrounding the weld line, Offshore joining method.

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