JP2004034851A - Method for connecting floating body structure on the sea - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for connecting floating body structures on the sea capable of reducing cost of connection on the sea by making expensive underwater welding unnecessary, enabling maintenance of a floating body and extending lifetime of the floating body structure. <P>SOLUTION: In the method for connecting the floating body structure on the sea connecting floating bodies 1, 3 floating upper parts 1b, 3b thereof above water surface by buoyancy provided by submerging lower parts 1a, 3a thereof, at least draft parts 1a, 3a of the floating bodies 1, 3 are connected by a fastener 5 and the upper parts 1b, 3b above the draft parts 1a, 3a of the floating bodies 1, 3 are connected by welding 6. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for sea-based joining of floating structures, and more particularly, to an improved technique for joining a floating body whose lower part is submerged without using underwater welding.
[0002]
[Prior art]
In recent years, along with requests for expansion of airport facilities, new construction of oil storage bases and disaster prevention bases, construction of a floating structure by a so-called mega-float method for securing a large-scale flat surface on the sea has been attempted. The mega-float method allows the construction of floating units using shipbuilding facilities all over the country, so the construction period is short, and most of the work is performed in a well-equipped factory, so construction costs are low. It has many advantages such as being floating type, not affected by the ground condition and the like, without uneven settlement, and being floating in the water, almost no shaking is transmitted even if the ground shakes, and it is strong against earthquakes. In addition, since the tidal flow is hardly changed, there is an advantage that there is little influence on water quality, sediment, plankton, and benthic organisms and that it is environmentally friendly.
[0003]
Examples of the floating structure include a box-shaped floating structure and a comb-shaped floating structure. The box-shaped floating structure is formed by connecting a plurality of box-shaped floating bodies. The comb-shaped floating structure has a plurality of comb-tooth-shaped floating bodies provided at equal intervals on the lower surface of the deck. In each of these floating structures, the deck is supported on the water surface by the buoyancy of a plurality of floating bodies whose lower portions are submerged. These floating structures were integrally formed by joining a plurality of divided blocks at sea.
[0004]
[Problems to be solved by the invention]
However, there is a problem that joining the blocks at sea requires underwater welding, which increases the cost. In addition, once the floating structure is constructed, maintenance becomes difficult. Therefore, it is necessary to use an anticorrosion material especially in a draft portion where corrosion is severe, and there is a disadvantage that the material cost and the production cost increase.
The present invention has been made in view of the above circumstances, and a first object of the present invention is to eliminate the need for expensive underwater welding and reduce the cost of marine joining, so that maintenance of the floating body is possible, and the life of the floating body structure is accordingly reduced. It is an object of the present invention to provide a method of joining a floating structure at sea, which can extend the length of a floating structure. A second object of the present invention is to provide a method of sea bonding a floating structure, which can reduce the manufacturing cost by eliminating the need for expensive anticorrosion materials.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the method of claim 1 of the present invention for sea bonding of a floating structure includes a floating structure that joins floating bodies whose upper parts are floated on the water surface by buoyancy obtained by submerging the lower part. In the sea bonding method, at least a draft portion of the floating bodies is joined by a fastener, and an upper part of the draft portion of the floating bodies is joined by welding.
[0006]
In this method of sea bonding of a floating structure, a draft portion of the floating body is joined using a fastener, and an upper portion of the draft portion of the floating body is joined by welding. That is, the draft portion that required underwater welding is joined by the fastener, and the upper portion that does not require underwater welding is joined by ordinary welding. Therefore, even in the case of a floating body whose lower part is submerged, expensive underwater welding is not required, and it is possible to reduce marine joining costs. Thereby, the maintenance of the floating body becomes possible. Moreover, since it is assumed that maintenance is possible, an expensive anticorrosion material for improving corrosion resistance is not required.
[0007]
3. The method of sea bonding a floating structure according to claim 2, wherein in the sea bonding method of a floating structure, wherein floating bodies whose upper parts float on the water surface by buoyancy obtained by submerging a lower part thereof, at least a draft between the floating bodies. The parts are fastened so as to be separable, and after connecting the plurality of floating bodies, only the draft part of the specific floating body is separated and removed, and a new draft part is fastened to the removed portion. I do.
[0008]
In this method of joining floating structures to the sea, the draft portions of the floating structures are fastened in a separable manner, and after a plurality of floating structures are connected to each other, only the draft portion of a specific floating structure can be separated and removed. Draft part is fastened. Accordingly, the draughty portion with high corrosion can be separated and re-fastened without performing expensive underwater welding, and the cost of sea joining is reduced. Thereby, the maintenance of the floating body becomes possible. Moreover, since it is assumed that maintenance is possible, an expensive anticorrosion material for improving corrosion resistance is not required.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings.
FIG. 1 is a side view of a floating body joining portion illustrating a first embodiment of a sea joining method according to the present invention, FIG. 2 is a process explanatory view showing a specific joining example of the sea joining method shown in FIG. 1, FIG. 3 is a process explanatory view showing another joining example.
[0010]
The sea joining method of a floating structure described in each of the following embodiments can be applied to any joint portion of a box-shaped floating structure or a comb-shaped floating structure. The box-shaped floating structure is formed by connecting a plurality of box-shaped floating bodies. The comb-shaped floating structure has a plurality of comb-tooth-shaped floating bodies provided at equal intervals on the lower surface of the deck. In the case of a box-shaped floating structure, for example, the present sea-sea joining method can be suitably used for joining divided box-shaped floating bodies. Further, in the case of the comb-shaped floating structure, it can be suitably used also for joining the plurality of divided units of the comb-shaped floating body, or for partially joining the column which is a constituent part of the comb-shaped floating body. it can.
[0011]
In the sea joining method according to the present embodiment, basically, as shown in FIG. 1, at least the draft portions 1a, 3a of the floating bodies 1, 3 are joined using a fastener 5, and the draft portions 1a of the floating bodies 1, 3 are joined. The upper portions 1b and 3b above the upper portions 3a and 3a are joined by welding 6. Thus, the lower bodies (draft portions 1a, 3a) are submerged, and the floating bodies 1, 3 having the upper parts 1b, 3b floating on the water surface by buoyancy are joined. In addition, in the figure, 10 shows a draft line. Further, "at least the draft portions 1a, 3a" means that the fastener 5 may be used also in a portion above the draft line 10. Thereby, underwater welding can be reliably eliminated. In other words, "at least the draft portions 1a, 3a" can be defined as "portions requiring underwater welding".
[0012]
As a more specific example of the sea joining method, as shown in FIG. Is planted. Then, as shown in FIG. 2B, after the two floating bodies 1 and 3 are moved in the approaching direction and brought into contact with each other, a connecting plate 11 which is a fastener 5 having a bolt insertion hole 9 drilled at a predetermined position. Is inserted into the bolt 7 and the nut 13 is screwed. Thereby, as shown in FIG. 3C, the lower portions of the side plates of the floating bodies 1 and 3 are joined by the fasteners 5. Next, the joints at the upper portions 1b and 3b of the floating bodies 1 and 3 are joined by ordinary welding 6. Although only one side surface is shown in FIG. 2, the opposite side surface is similarly joined. The number of fasteners 5 is appropriately set according to the required joining strength.
[0013]
According to the method of sea bonding of the floating structures, the draft portions 1a, 3a of the floating bodies 1, 3 are joined using the fastener 5, and the upper portions 1b, 3b above the draft portions 1a, 3a of the floating bodies 1, 3 are provided. Are joined by welding 6. In other words, the draft portions 1a and 3a that required underwater welding are joined by the fastener 5, and the upper portions 1b and 3b that do not require underwater welding are joined by ordinary welding 6. Therefore, expensive underwater welding is not required for the maintenance of the floating bodies 1 and 3 whose lower parts are submerged, and the cost of marine joining can be reduced. Thereby, the maintenance of the floating bodies 1 and 3 becomes possible. Moreover, since it is assumed that maintenance is possible, an expensive anticorrosion material for improving corrosion resistance is not required.
[0014]
Furthermore, according to this floating structure sea bonding method, the bolts 7 are preliminarily implanted in the side plates of the floating bodies 1 and 3 and work can be performed from the side surfaces of the floating bodies 1 and 3. Even if the floating bodies 1 and 3 are retracted to the back (for example, to the left in FIG. 2A) and cannot be fastened from the inside of the floating body, joining by the fasteners 5 can be enabled.
[0015]
Further, as another joining example of the first embodiment, as shown in FIG. 3A, a bolt hole 19 is drilled in the lower part of the opposed joining end faces 17, 17 of the floating bodies 1, 3. As shown in FIG. 3B, a nut 23 is screwed into a bolt 21 inserted from the inside of one of the floating bodies 1 in the other floating body 3 to screw the joint end faces 17 and 17 together. There may be. Also in this case, the joining portions of the upper portions 1b and 3b are joined by ordinary welding 6.
[0016]
In this example, since the bolt holes 19 are formed in the joining end faces 17 and 17 of the floating bodies 1 and 3, the elastic material 25 is attached to at least each side of the draft portions 1a and 3a in the joining end faces 17 and 17. Is preferred. The elastic material 25 can absorb the unevenness of the joint end faces 17 and 17 to improve the close contact and the water tightness.
[0017]
According to the sea joining method of the floating structures, the draft portions 1a, 3a of the floating bodies 1, 3 are joined by using the fasteners 5, similarly to the sea joining method shown in FIG. Since the upper portions 1b and 3b above the portions 1a and 3a are joined by the welding 6, expensive underwater welding is not required, and the cost of sea joining can be reduced. Thereby, maintenance of the floating bodies 1 and 3 becomes possible, and an expensive anticorrosion material for improving corrosion resistance is not required.
[0018]
Next, a second embodiment of the sea bonding method according to the present invention will be described.
FIG. 4 is a process explanatory view for explaining the second embodiment.
As shown in FIG. 4A, the floating bodies 31, 33, and 35 used in the sea bonding method according to this embodiment fasten at least the draft portions 31a, 33a, and 35a in a separable manner. For fastening, bolts are implanted in the side plates of the floating bodies 31, 33, 35, and a connecting plate 37 as a fastener is screwed to the bolts, or a bolt hole is formed in the side plates of the floating bodies 31, 33, 35. The connecting plate 37 can be screwed from inside and outside of the floating bodies 31, 33, and 35 with bolts and nuts. The upper portions 31b, 33b, 35b above the draft portions 31a, 33a, 35a are joined by ordinary welding 6. Note that “at least the draft portions 31a, 33a, and 35a” means that the boundary where separation and joining are performed may be above the draft line 10. Thereby, underwater welding can be reliably eliminated. In other words, "at least the draft portions 31a, 33a, 35a" can be defined as "portions requiring underwater welding".
[0019]
Therefore, when the draft portion 33a of the specific floating body 33 is corroded vigorously after the plurality of floating bodies 31, 33, 35 are connected, as shown in FIG. 4B, only the draft portion 33a of the specific floating body 33 is used. Is released, separated and removed, and a new draft portion 33a is fastened to the removed portion. In other words, the floating body below the draft portion that requires underwater welding can be replaced by releasing and refastening the fasteners without relying on welding.
[0020]
According to the sea-structure joining method of the floating structures, the draft portions 31a, 33a, 35a of the floating structures 31, 33, 35 are fastened in a separable manner, and after the plurality of floating structures 31, 33, 35 are connected, a specific Only the draft portion 33a of the floating body 33 can be separated and removed, and a new draft portion 33a is fastened to the removed portion. Therefore, the drought portion where corrosion is severe can be separated and re-fastened without performing expensive underwater welding, and the cost of marine joining can be reduced. Thereby, the maintenance of the floating bodies 31, 33, 35 becomes possible. Moreover, since it is assumed that maintenance is possible, an expensive anticorrosion material for improving corrosion resistance is not required.
[0021]
In each of the above embodiments, the case where a bolt is used as a fastener has been described as an example. However, the same effect as described above can be obtained by using a rivet or other fastening means for the fastener. Needless to say.
[0022]
【The invention's effect】
As described in detail above, according to the method of sea bonding of a floating structure according to claim 1 of the present invention, a draft portion of the floating body is joined using a fastener, and a portion above the draft portion of the floating body is welded. In this case, expensive underwater welding is not required for the maintenance of the floating body whose lower part is submerged, and the cost of sea bonding can be reduced. As a result, maintenance of the floating body becomes possible, and the life of the floating body structure can be extended. Further, since it is assumed that maintenance is possible, an expensive anticorrosion material for improving corrosion resistance is not required, and the manufacturing cost of the floating structure can be reduced.
[0023]
According to the sea joining method of the floating structure according to the second aspect, the draft portion of the floating body is fastened so as to be separable, and after connecting a plurality of floating bodies, only the draft portion of the specific floating body is separated and removed. However, since a new draft portion is fastened to the removed portion, a highly corrosive draft portion can be separated and refastened without performing expensive underwater welding, thereby reducing marine joining costs. As a result, maintenance of the floating body becomes possible, and the life of the floating body structure can be extended. Further, since it is assumed that maintenance is possible, an expensive anticorrosion material for improving corrosion resistance is not required, and the manufacturing cost of the floating structure can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a floating body joining portion for explaining a first embodiment of a sea joining method according to the present invention.
FIG. 2 is a process explanatory view showing a specific bonding example of the sea bonding method shown in FIG.
FIG. 3 is a process explanatory view showing another joining example.
FIG. 4 is a process explanatory view illustrating a second embodiment.
[Explanation of symbols]
Floating bodies 1a, 3a; draft parts 1b, 3b; upper part 5; fasteners 6; welding 31, 33, 35; floating bodies 31a, 33a, 35a; draft parts 31b, 33b, 35b; upper parts

Claims (2)

In the sea joining method of a floating body structure that joins floating bodies whose upper part is floated on the water surface by buoyancy obtained by submerging the lower part,
At least a draft portion between the floating bodies is joined by a fastener, and a portion above the draft portion between the floating bodies is joined by welding. In the sea joining method of a floating body structure that joins floating bodies whose upper part is floated on the water surface by buoyancy obtained by submerging the lower part,
At least the draft portion of the floating bodies is fastened to be separable,
After connecting a plurality of said floating bodies, only the draft portion of the specific floating body is separated and removed, and a new draft portion is fastened to the removed portion.

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