Offshore joining system and offshore joining method

Abstract

Provided are an offshore joining system, an offshore joining chamber, and an offshore joining method that can easily join floating structures offshore. [Solution] The offshore joining system 1 comprises a floating structure 2 having a welding line 3 on its bottom 2b that is submerged in the sea, and a chamber 10 that is attached to the bottom 2b of the floating structure 2 and forms a dry space surrounding the welding line 3, a guide mechanism 50 is provided on the bottom 2b of the floating structure 2 along the welding line 3, and a gliding mechanism 60 that can glide along the guide mechanism 50 is provided in the chamber 10, and at least one of the guide mechanism 50 and the gliding mechanism 60 includes a wire.

Description

[Technical Field]

[0001] The present invention relates to an offshore connecting system. and This relates to offshore joining methods. [Background technology]

[0002] In recent years, in order to make effective use of marine space for wind power generation, etc., it has been planned to construct large floating structures by joining floating structures together at sea. As a chamber device to be used for joining such floating structures at sea, Patent Document 1 listed below discloses a chamber device for welding the bottom plates of a floating structure, which is used to weld the weld seam of the bottom plates of a large marine structure in a dry space.

[0003] This chamber device has two guide rails attached along both sides of the weld line on the bottom plate of the floating structure, and a box-shaped bottom chamber with an open top that can move along the guide rails under the underside of the bottom plate using rollers, and the bottom chamber is pressed and fixed to the underside of the bottom plate via fixing jigs attached to the underside of the bottom plate, the guide rails, and the bottom chamber, with a water-stopping material interposed between them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-99886 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when at sea, the floating structure and bottom chamber sway due to the effects of waves and ocean currents, which can cause severe interference between the guide rails and rollers, potentially resulting in damage to one of them. Furthermore, to prevent the rollers from coming off the guide rails, the roller configuration must be complex, which reduces robustness when considering repeated operation. Furthermore, when retracting the bottom chamber onto the underside of the ship's bottom plating, delicate alignment underwater is required to align the front roller of the bottom chamber with the guide rail, a complicated procedure that places a heavy burden on the diver.

[0006] The present invention has been made in consideration of the above problems, and provides an offshore joining system that can easily join floating structures on the ocean. and The object is to provide an offshore joining method. [Means for solving the problem]

[0007] In order to solve the above problem, an offshore joining system according to a first aspect of the present invention comprises a floating structure having a weld line on its bottom that 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 on 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 includes a first wire installed along the weld line, and the sliding mechanism includes an engagement piece that movably engages with the first wire, and a second wire that is connected to the engagement piece and suspends the chamber.

[0009] A third aspect of the present invention may be such that, in the offshore joining system of the second aspect, a retraction device is connected to the engagement piece and retracts the chamber into the bottom of the floating structure.

[0010] A fourth aspect of the present invention is an offshore joining system according to any one of the first to third aspects, wherein the chamber may comprise 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 connecting system according to the fourth aspect, wherein the bottom chamber may be divisible into a plurality of chamber units.

[0012] A sixth aspect of the present invention is an offshore connecting 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 joining system according to any one of the first to sixth aspects, wherein the chamber may be provided with a reinforcing structure protruding on an outer surface facing away from the inner surface forming the dry space.

[0014] An offshore joining chamber according to an eighth aspect of the present invention comprises a chamber body that is open at least upward, a wire having 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 process for installing a wire along a welding line at the bottom of a floating structure, a chamber installation process for sliding a chamber along the wire and pulling the chamber into the bottom of the floating structure and installing it, and a dry space formation process for draining seawater from inside the chamber and forming a dry space surrounding the welding line. [Effects of the Invention]

[0016] According to one aspect of the present invention, an offshore joining system that can easily join floating structures on the ocean andIt is possible to provide an offshore joining method. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is an overall schematic diagram of an offshore connection system according to an embodiment; [Figure 2] FIG. 1 is a front view of an offshore connection system according to an embodiment. [Figure 3] FIG. 3 is a view taken along the line III-III in FIG. 2. [Figure 4] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 5] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 6] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 7] FIG. 7 is a plan view of an area A shown in FIG. 6 as viewed from above. [Figure 8] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 9] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 10] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 11] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 12] 1 is an explanatory diagram of an offshore joining method according to one embodiment; [Figure 13] FIG. 10 is a front view of an offshore connection system according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, the offshore joining system, the offshore joining chamber, and the offshore joining method of this embodiment will be described with reference to the drawings.

[0019] FIG. 1 is an overall schematic diagram of an offshore connection system 1 according to one 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 attached 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 arranged with their joint surfaces horizontally butted against each other. The chamber 10 has a U-shape that opens upward, and is in contact with the bottom 2b and side 2c of the floating structure 2. The chamber 10 has a tunnel-type duct structure, and forms a dry space surrounding the weld seam 3 of the floating structure 2.

[0021] Fig. 2 is a front view of the offshore connection system 1 according to one embodiment. Fig. 3 is a view taken along the line III-III in Fig. 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] 3, the bottom chamber 20 includes a bottom-facing wall 21 that faces the bottom 2b of the floating structure 2 with a gap (dry space) therebetween, and a pair of bottom side walls 22 that stand upright from the bottom-facing wall 21 toward the bottom 2b of the floating structure 2. The bottom-facing 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 widthwise end edges of the bottom-facing wall 21.

[0023] The upper edges of the pair of bottom side walls 22 are provided with watertight gaskets 23 that come into contact with the bottom 2b of the floating structure 2. The bottom chamber 20 is provided with a reinforcing structure 24 that protrudes from the outer surface facing away from the inner surface that forms the dry space. The reinforcing structure 24 is provided with 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 arranged on the inner surface of the bottom chamber 20, which pulls the bottom chamber 20 up 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 hoists 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 that is manually operated. 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 wound up. This causes the bottom chamber 20 to rise and the watertight packing 23 to be pressed against the bottom 2b of the floating structure 2. Note that the hoisting machine 72 is not limited to being manually operated, and may be configured to use other power sources such as electric winding.

[0026] As shown in Figure 2, the bottom chamber 20 can be divided into chamber units 20A and 20B. The chamber units 20A and 20B are arranged with their connecting surfaces 12 abutting each other horizontally. The chamber units 20A and 20B are connected via bolts or the like. With this configuration, the bottom chamber 20 can be divided for storage and transportation, improving storage and transportation efficiency.

[0027] The side chamber 30 includes a side opposing wall 31 that faces the side 2c of the floating structure 2 with a gap (dry space) therebetween, 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 widthwise end edges of the side opposing wall 31 toward the side 2c of the floating structure 2.

[0028] Watertight gaskets 33 that come into contact with the side portions 2c of the floating structure 2 are provided on the vertically extending edges of the pair of side walls 32. The side chamber 30 is also provided with a reinforcing structure 34 that protrudes from the outer surface facing away from the inner surface that forms the dry space. The reinforcing structure 34 includes 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 people 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 in the horizontal direction as it moves away from the floating structure 2. 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 Fig. 3, a guide mechanism 50 is provided on the bottom 2b of the floating structure 2. The guide mechanism 50 includes a first wire 51 that is installed along the weld line 3 on the bottom 2b of the floating structure 2. The first wires 51 are provided in pairs and extend parallel to each other along the weld line 3. The chamber 10 is provided with a gliding mechanism 60 that can glide along the guide mechanism 50.

[0031] The sliding mechanism 60 includes an engagement piece 61 that movably engages with the first wire 51, and a second wire 62 that is connected to the engagement piece 61 and suspends the chamber 10. An example of the engagement piece 61 is a shackle. The engagement piece 61 may also be a hook as long as it can engage with the first wire 51. Note that the engagement piece 61 is preferably one that does not come off the first wire 51 due to rocking in the sea, and therefore is preferably a closed annular member such as a shackle.

[0032] The second wire 62 is fixed to the inner surface of the bottom side wall 22. The engagement pieces 61 and the second wire 62 are provided as a pair 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 includes a winch 41 and a retraction wire 42 that is reeled out from the winch 41 and connected to the engagement pieces 61. The retraction wire 42 branches into a first wire end 43a and a second wire end 43b and is connected to the pair of engagement pieces 61, as shown in FIG. 7 described later.

[0033] Next, an offshore joining method using the offshore joining system 1 having the above-described configuration will be described with reference to FIGS. 4 to 6 and 8 to 12 are explanatory views of an offshore joining method according to one embodiment. Note that Fig. 7 is a plan view of the area A shown in Fig. 6 as viewed from above.

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

[0035] Next, as shown in FIG. 5, the first wire 51 is erected along the joint surface of the bottom 2b of the floating structure 2 (wire erection process). The first wire 51 is erected by a diver. The first wire 51 may also be erected on land before the floating structure 2 is launched. Furthermore, not only the first wire 51 but also the retraction device 40 may be installed before the floating structure 2 is launched. Next, the bottom chamber 20 is suspended by the crane wire 201, and the bottom chamber 20 is lowered horizontally into the sea.

[0036] Next, as shown in Figure 6, the crane wire 201 is moved to insert the end of the bottom chamber 20 under the floating structure 2. When the bottom chamber 20 reaches a predetermined position, the engagement piece 61 of the planing mechanism 60 provided on 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] 7, the retraction wire 42 is attached to the engagement pieces 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 engagement pieces 61. Note that the attachment of the retraction wire 42 to the engagement pieces 61 and the attachment of the engagement pieces 61 to the first wire 51 are performed by a diver. The guide mechanism 50 and the gliding mechanism 60 include wires (first wire 51, second wire 62) that are easy to handle underwater, making the attachment work easy.

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

[0039] Since the guide mechanism 50 and the planing 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 sways due to the influence of waves, ocean currents, etc., the wires (first wire 51, second wire 62) move flexibly in response to the swaying. This makes it possible to prevent the guide mechanism 50 and the planing mechanism 60 from becoming disengaged or being damaged.

[0040] 7, by connecting the retraction wire 42 to the engagement piece 61 instead of the bottom chamber 20, the point of force (the retraction force of the retraction wire 42) and the point of action (the suspension point of the bottom chamber 20) can be made the same, which significantly improves the retraction efficiency of the bottom chamber 20. This makes it possible to avoid, for example, a so-called sticking state in which the engagement piece 61 gets caught on the first wire 51 and becomes unable to move.

[0041] As shown in Figure 9, once the bottom chamber 20 has been pulled under 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 injecting and discharging ballast water that has been injected in advance from the float 25 (see Figure 3) that was attached before the bottom chamber 20 was launched. Once the underwater weight of the bottom chamber 20 has been adjusted, the crane wire 201 is removed.

[0042] Next, the lever of the hoist 72 (see Figure 3) of the hoisting mechanism 70 is operated to hoist 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 has been attached to the bottom 2b of the floating structure 2, the pulling jig 44 is removed with the crane wire 201, as shown in Figure 9.

[0043] 10 , the side chamber 30 is suspended by a crane wire 201, and while the side chamber 30 is being lowered vertically into the sea, the crane wire 201 is used to move the side chamber 30 toward the side 2 c of the floating structure 2, so that the side chamber 30 is close to or abutting the bottom chamber 20. The side chamber 30 is then connected to the bottom chamber 20 with bolts or the like. Note that after the side chamber 30 is lowered vertically into the sea, the side chamber 30 may be moved toward the side 2 c of the floating structure 2 with the crane wire 201, so that the side chamber 30 is close to or abutting the bottom chamber 20.

[0044] Next, a hoisting mechanism (not shown) inside the side chamber 30 is used to pull the side chamber 30 toward the side 2c of the floating structure 2, compressing the waterproof packing 33. Once the side chamber 30 has been attached to the side 2c of the floating structure 2 in this manner, the crane wire 201 is removed. Next, in a similar manner, 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, as shown in Figure 11.

[0045] Next, as shown in Figure 12, a drain pump 80 is installed to drain the seawater inside the chamber 10, forming a dry space surrounding the weld line 3 (dry space forming process). The diver visually checks for gaps in the watertight packings 23, 33. If gaps are found in the watertight packings 23, 33, they are waterproofed by filling the gaps with material or the like. Once a dry space has been formed inside the chamber 10 in this manner, an automatic welding machine or the like is introduced into the chamber 10 to join the floating structure 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 that is submerged in the sea, and a chamber 10 that is attached to the bottom 2b of the floating structure 2 and forms 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 planing mechanism 60 that can slide along the guide mechanism 50, and at least one of the guide mechanism 50 and the planing mechanism 60 includes a wire. With this configuration, even if at least one of the floating structure 2 and the bottom chamber 20 sways due to the influence of waves, ocean currents, etc., the wires (first wire 51, second wire 62) move flexibly in response to the swaying, thereby preventing the guide mechanism 50 and the planing mechanism 60 from becoming disengaged or being damaged.

[0047] In this embodiment, the guide mechanism 50 includes a first wire 51 that is installed along the weld line 3, and the gliding mechanism 60 includes an engagement piece 61 that movably engages with the first wire 51, and a second wire 62 that is connected to the engagement piece 61 and suspends the chamber 10. With this configuration, the bottom chamber 20 can be glided along the first wire 51 in a zip-line manner, and pulled into the underside of the bottom 2b of the floating structure 2.

[0048] Furthermore, this embodiment includes a retraction device 40 that is connected to the engagement piece 61 and retracts the chamber 10 into the bottom 2b of the floating structure 2. According to this configuration, as shown in Fig. 7, by connecting the retraction wire 42 to the engagement piece 61 instead of the bottom chamber 20, the force point (the retraction force of the retraction wire 42) and the point of action (the suspension point of the bottom chamber 20) can be made the same, thereby significantly improving the retraction efficiency of the bottom chamber 20.

[0049] 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 attached so as to surround the submerged portion of the weld seam 3 of the floating structure 2.

[0050] Furthermore, in this embodiment, the bottom chamber 20 can be divided into a plurality of chamber units 20 A, 20 B. According to this configuration, the bottom chamber 20 can be divided for storage and transportation, improving storage and transportation efficiency.

[0051] In this embodiment, a dividing line 11 is provided between the bottom chamber 20 and the side chamber 30, and the dividing line 11 slopes downward in the horizontal direction as it moves away from the floating structure 2. With this configuration, as shown in Fig. 6, when the bottom chamber 20 is pulled under 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 Figs. 10 and 11, when the side chamber 30 is brought close to the side 2c of the floating structure 2, it is not necessary to move the side chamber 30 up and down, and therefore vertical shear force does not need to be applied to the watertight gasket 33, thereby improving watertightness.

[0052] In this embodiment, the chamber 10 is provided with reinforcing structures 24, 34 that protrude on the outer surface facing away from 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, improving work efficiency.

[0053] Moreover, the chamber 10 (offshore joining chamber) according to this embodiment includes a chamber body that is open at least upward, a second wire 62 (wire) having one end connected to the inner surface side of the chamber body, and an engagement piece 61 connected to the other end of the second wire 62. With this configuration, the chamber 10 can be zip-lined and pulled in to the underside of 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 weld line 3 on 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 the bottom 2b of the floating structure 2 and installing it, and a dry space formation step of draining seawater from inside the chamber 10 to form a dry space surrounding the weld line 3. This configuration is less susceptible to the effects of waves and ocean currents, making it highly robust, and also reduces the load on divers, making it easy to join the floating structures 2 offshore.

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

[0056] For example, the following configuration may be adopted. FIG. 13 is a front view of the offshore connection system 1 according to a modified example of the embodiment. 13, the dividing line 11 between the bottom chamber 20 and the side chamber 30 may be inclined upward in the horizontal direction as it moves away from the floating structure 2. According to 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 part 2c of the floating structure 2.

[0057] Furthermore, in the above embodiment, a configuration has been described in which the guide mechanism 50 includes the first wire 51 and the sliding mechanism 60 includes the second wire 62, but this configuration is not limiting. For example, the guide mechanism 50 may include a guide member that is easily deformed, such as a round bar, instead of the first wire 51. Furthermore, when the guide mechanism 50 includes the first wire 51, the sliding mechanism 60 may include only the engagement piece 61, which is rigidly fixed to the bottom chamber 20. In this case, the first wire 51 of the guide mechanism 50 and the engagement piece 61 of the sliding mechanism 60 are connected.

[0058] In the above embodiment, the chamber 10 has two side chambers 30 and is U-shaped and open upward, but is not limited to this configuration. For example, the chamber 10 may have one side chamber 30 and be L-shaped.

[0059] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0060] 1 Offshore docking system 2. Floating structures 2a upper part 2A First Floating Body 2b bottom 2B Second floating body 2c Side 3 Welding Lines 10 chambers 11 Dividing Line 12 Connecting surface 20 Bottom Chamber 20A Chamber Unit 20B Chamber Unit 21 Bottom facing wall 22 Bottom sidewall 23 Watertight packing 24 Reinforcement structure 24a 1st Rib 24b 2nd Rib 25 Float 30 Side Chamber 31 Side facing wall 32 Side Wall 33 Watertight packing 34 Reinforcement structure 34a First Rib 34b 2nd Rib 35 Ladder 40 Retraction device 41 Winch 42 wire 43a First wire end 43b Second wire end 44 Pull-in jig 45 End 46 Shackle 50 Guide mechanism 51 First Wire 60 Gliding mechanism 61 Engagement piece 62 Second Wire 70 Hoisting mechanism 71 Fixed Wire 72 Hoisting machine 80 Drainage pump 100 sea level 201 Crane Wire

Claims

1. a floating structure having a weld line at its bottom that sinks into the sea; a chamber attached to the bottom of the floating structure and forming a dry space surrounding the weld line; a guide mechanism is provided on 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 includes a first wire that is laid along the welding line, The sliding mechanism includes: an engagement piece that movably engages with the first wire; a second wire connected to the engagement piece and suspending the chamber; The offshore connection system according to claim 1 .

3. a retraction device connected to the engagement piece and adapted to retract the chamber to the bottom of the floating structure; The offshore connection system according to claim 2 .

4. The chamber comprises: a bottom chamber attached to the bottom of the floating structure; a side chamber connected to the bottom chamber and extending above sea level; The offshore connecting system according to any one of claims 1 to 3.

5. The bottom chamber can be divided into a plurality of chamber units. The offshore connection system according to claim 4 .

6. A dividing line is provided between the bottom chamber and the side chamber, and the dividing line is inclined downward as it becomes farther away from the floating structure in the horizontal direction. The offshore connection system according to claim 5 .

7. The chamber has a reinforcing structure protruding from an outer surface thereof facing away from an inner surface thereof forming the dry space. The offshore connecting system according to any one of claims 1 to 3.

8. a wire erection process of erecting a wire along a weld line at the bottom of the floating structure; a chamber attachment step of sliding the chamber along the wire and pulling the chamber into the bottom of the floating structure and attaching it to the bottom; and a dry space forming step of draining seawater from the chamber to form a dry space surrounding the weld line. Offshore joining method.

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