JP2017074917A - Floating structure for transfer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce man-days required for joining and cutting works for a floating structure for transfer, which is composed of the boat neck part structure and the boat tail part structure of the boat neck part structure, central part structure, and boat tail part structure of a boat-shaped floating structure.SOLUTION: A floating body structure for transfer integrating a boat neck part structure and a boat tail part structure for a boat-shaped floating structure is constructed. In this case, in the boundary between the boat-neck part structure and the boat-tail part structure, part of a boat hull structure member contributing to longitudinal flexural strength in the boat-shaped floating structure, such as a plate or frame around a horizontal neutral axis N, is not joined to provide a non-junction 18.SELECTED DRAWING: Figure 3

Description

  The present invention constructs the center structure in a yard different from the bow structure and the stern structure, and moves the bow structure and stern structure to the center structure construction yard. The present invention relates to a ship-shaped floating structure constructed by joining a structure, a center structure, and a stern structure.

  The mother yard is used to construct the bow structure and stern structure of the ship-shaped floating structure in the mother yard, and the construction of the center structure and the joining of the bow structure, stern structure, and center structure. A construction method of a ship-shaped floating structure performed in another subyard is known. In such a construction process, the bow structure and the stern structure are connected to form a movable floating structure that can be navigated. After moving to the subyard where the center structure is built, the bow structure is separated and separated from the bow. There is also known a method of completing a target ship-shaped floating structure by joining the substructure, the central structure, and the stern structure again (Patent Document 1).

JP 2014-121920 A

  However, in the construction method as in Patent Document 1, since it is necessary to cut after joining the bow structure and the stern structure, the work process increases, the construction period becomes longer, and the cost becomes higher. .

  The present invention relates to a work for joining / cutting a floating structure for movement composed of a bow structure and a stern structure among a bow structure, a center structure, and a stern structure of a ship-shaped floating structure. The challenge is to reduce man-hours.

  The moving floating structure of the present invention is a moving floating structure composed of a bow structure and a stern structure among the bow structure, the center structure, and the stern structure of the ship-shaped floating structure. In addition, a part of the hull structure member that contributes to the bending strength in the longitudinal direction in the ship-shaped floating structure is a non-joined part that is not joined at the boundary between the bow structure and the stern structure. Yes.

  The non-joining portion includes at least one of a plate material and an aggregate. Moreover, the board | plate material which comprises a ship bottom or a ship side outer board, for example is joined in the said boundary. At the boundary, for example, aggregate provided on the ship bottom or the ship side skin is joined.

  When a non-joining part is provided with respect to a board | plate material and watertightness is requested | required of the division comprised by the said part, it is preferable to seal with a sealing material. When the non-joining portion is provided to the aggregate, a clearance having a predetermined width is provided between the aggregate of the bow structure and the aggregate of the stern structure. You may attach the girder joined with a board | plate material to the edge part of the aggregate which forms clearance. The end of the aggregate that forms the clearance may be the snip end. The hypotenuse of the snip end has, for example, a concave R shape. The end of the aggregate that forms the clearance may have a counterbore near the plate.

  In the plate material, for example, an opening for relaxing stress concentration is provided at the boundary. The joint portion of the bow structure and the stern structure to the central structure has a shape complementary to the joint of the central structure.

  According to the present invention, the joining / cutting operation of the floating structure for movement composed of the bow structure and the stern structure among the bow structure, the center structure, and the stern structure of the ship-shaped floating structure. It is possible to reduce the work man-hours in

It is a typical perspective view of the bow part structure separated by the subyard, the stern part structure, and the center part structure constructed by the subyard. It is a figure which shows the process of moving a bow part structure and a stern part structure as a floating structure for a movement, cutting / separating, and joining with a center part structure, and building a ship-shaped floating structure. It is a cross-sectional view of the joint surface of the floating structure for movement of this embodiment. It is an arrow line view of the junction part of a board | plate material seen from the A direction of FIG. 3, and a non-joining part. It is an arrow line view of another example of the junction part of a board | plate material seen from the A direction of FIG. 3, and a non-joining part. It is an arrow line view of another example of the junction part of a board | plate material seen from the A direction of FIG. 3, and a non-joining part. It is a side view of the non-joining part which made the aggregate non-joining. It is a side view of another example of the non-joining part which made the aggregate non-joining. It is a perspective view of the non-joining part of FIG. It is a side view of another example of the non-joining part which made the aggregate non-joining. It is a side view of another example of the non-joining part which made the aggregate non-joining. It is a side view of another example of the non-joining part which made the aggregate non-joining. It is a figure which illustrates the case where the board | plate material of a bow part structure body or a stern part structure body is joined to the board | plate material of the center part structure which has a shape complementary to the edge part shape in the example of FIG. 7 and 10 to 12 illustrate the case where the aggregate of the bow structure or the stern structure is joined to the aggregate of the center structure having a shape complementary to the end shape. is there. It is a cross-sectional view in the joint surface of the floating structure for a movement when a sealing material is provided in a non-joining part. It is a cross-sectional view of the joint surface of the floating structure for movement of a modification. It is a cross-sectional view of the joint surface of the floating structure for movement of another modification.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 and FIG. 2 are schematic diagrams for explaining a method of building a ship-shaped floating structure using a moving floating structure according to an embodiment of the present invention.

  The ship-shaped floating structure 10 according to the present embodiment is a floating structure having a hull shape, such as a floating production storage and loading facility. The bow structure 12 and the stern structure 14 of the boat-shaped floating structure 10 shown in FIG. 1A are a main yard as a moving floating structure 20 (FIG. 2A) having a navigable hull shape. It is built in one piece at the bow and tail construction yard. On the other hand, the central structure 16 of the boat-shaped floating structure 10 shown in FIG. 1B is constructed in a subyard (central construction / assembly yard).

  The moving floating structure 20 constructed in the main yard moves by being self-propelled or towed to the subyard. The floating structure 20 for movement is cut and separated in the subyard as shown in FIG. 2B, and the separated bow structure 12 and stern structure 14 are cross-sections at both ends of the center structure 16. Joined to 16A and 16B, respectively. Thereby, as shown in FIG.2 (c), the ship-shaped floating body structure 10 is completed.

  Since the separated bow structure 12 and stern structure 14 are joined to the center structure 16, the joint surface (12A) of the bow structure 12 and the joint surface (14A) of the stern structure 14 are Preferably, the cross-sections (12A, 14A) of the bow structure 12 and the stern structure 14 are at least cross-sections (16A, It is preferred to have a cross-sectional shape equal to 16B). From these facts, it is more preferable that the center structure 16 is a portion of the boat-shaped floating structure 10 in which, for example, the ship side skin is parallel and the ship bottom skin is flat. However, the cross-sectional shape of the portion other than the both end portions of the central structure 16 may be any shape from the viewpoint of the navigation performance at the time of joining and moving the floating structure 20 for movement.

  FIG. 3 shows the moving floating body structure 20 of the present embodiment, in which the respective members are joined (joined) in the cross section (12A, 14A) of the bow structure 12 and the stern structure 14 (joined part), and are not joined (not joined). It is a typical cross-sectional view which shows a junction part. An alternate long and short dash line N is a horizontal neutral axis related to a longitudinal bending moment in the floating structure 20 for movement. The hull member indicated by a solid line is a cut portion that is cut using fusing or a saw or a grindstone, or a metallurgical joining method such as pressure welding or fusion welding between the bow structure 12 and the stern structure 14; Or it is the junction part 17 joined using mechanical joining methods, such as a rivet joining and the joining with a volt | bolt, and the hull member shown with a broken line is joined between the bow part structure 12 and the stern part structure 14. FIG. It is the non-joining part 18 which is not performed.

  That is, the hull members (plate material, aggregate) of the bow structure 12 and the stern structure 14 are configured so as to satisfy the strength of the hull-shaped floating structure 10 after completion. Since the object 20 is significantly shorter in length than the completed ship-shaped floating structure 10, the vertical bending moment acting on the moving floating structure 20 is larger than the vertical bending moment acting on the ship-shaped floating structure 10. It is extremely small and has a sufficient margin for longitudinal strength. Moreover, since there is no load in the floating structure 20 for a movement, the load by a load does not act on the partition inside a structure. Furthermore, since the floating structure 20 for movement is used only while moving, the expected use period is short and the design load can be small. For these reasons, the vertical bending strength is sufficient for the moving floating structure 20 without joining all the hull members of the bow structure 12 and the stern structure 14, and in the present embodiment, a part thereof , The man-hours in the joining / cutting operation of the movable floating structure 20, the man-hours in the distortion work of the bow structure 12 and the stern structure 14 after cutting, and the assembly / working of the working scaffold Reduce man-hours for dismantling work.

  The contribution to the vertical strength of the moving floating structure 20 is a hull member separated from the horizontal neutral axis N. The closer the position is to the horizontal neutral axis N, the smaller the contribution is. The distance between the joint 18 and the horizontal neutral axis N is within a predetermined range (for example, from the horizontal neutral axis N to the upper deck side, the distance within 90% of the depth between the upper upper surface and the horizontal neutral axis N is From the vertical axis N to the ship bottom skin side, it is provided at a distance within 90% of the depth between the horizontal neutral axis N and the base line). In addition, the junction part 17 and the non-joint part 18 may be only a board | plate material, only an aggregate, or the combination of both.

  4 to 6 are arrow views of the joined state of the plate material 12P of the bow structure 12 and the plate material 14P of the stern structure 14 from the direction of arrow A in FIG. FIG. 4 is an example in which the straight sides of the plate members 12P and 14P are attached and joined. FIGS. 5 and 6 show the connection portion 17 and the non-joint portion 18 at the attachment ends of the plate members 12P and 14P. This is an example in which openings 21 and 22 for relaxing stress concentration at the boundary are provided. 4 to 6, the joint portion 17 is joined by welding, but other well-known joining methods such as rivets may be used. 4 to 6, it is assumed that both of the joining cross sections 12A and 14A are surfaces along a transverse section (vertical surface). However, the joining surface may be inclined in any direction, and the bow structure. If the body 12 and the stern structure 14 are formed in a complementary manner, they need not be flat.

  7 to 12 show states in the non-joined portions of the aggregates 12B and 14B when the longitudinal aggregates 12B and 14B of the bow structure 12 and the stern structure 14 are unjoined. In FIG. 7, the plate members 12 </ b> P and 14 </ b> P are cut or joined (cut portions or joint portions 17), and the end surface of the aggregate 12 </ b> B provided on the plate member 12 </ b> P of the bow structure 12 and the plate member 14 </ b> P of the stern structure 14 In this example, the end surfaces of the provided aggregate 14B are simply separated and a clearance is provided therebetween.

  FIGS. 8 and 9 are examples in which the girders 23 are attached to the end surfaces of the aggregates 12B and 14B and the plate members 12P and 14P in the configuration of FIG. 8 is a side view, and FIG. 9 is a perspective view. 8 and 9, the plate members 12P and 14P are separated by, for example, fusing or joined by welding (cutting portion or joining portion 17). For example, in the illustrated example, only every three aggregates 12B ′ and 14B ′ are joined, and the other aggregates 12B and 14B are separated by a predetermined distance and configured as non-joined parts as in FIG. Is done. The end faces of the aggregates 12B and 14B constituting the non-joined part are on the same plane, and the girder 23 is attached to each of the end faces. Thus, by using the girder 23, the fixed area of the aggregate increases, and deformation of the aggregate is prevented when an external force is applied.

  10 to 12 show the shapes of the end portions of the aggregates 12B and 14B in order to alleviate the stress concentration at the end portions of the aggregates 12B and 14B and the joint portions of the plate members 12P and 14P. -It is the example changed from the edge part shape of FIG. FIG. 10 shows a snip shape by providing a snip 24 at the end of the aggregate, and FIG. 11 shows a concave R (snip 24R) on the oblique side of FIG. FIG. 12 shows an example in which an arcuate bore 25 is provided near the joint with the plate members 12P and 14P at the ends of the aggregates 12B and 14B. In the illustrated example, the end shapes of the aggregates 12B and 14B are the same symmetrically between the bow structure 12 and the stern structure 14, but they may be different from each other. The 12 end shapes can be combined in various ways. 10 to 12, stress concentration at the ends of the aggregates 12B and 14B and the joints of the plate members 12P and 14P can be alleviated.

  As shown in FIGS. 5 to 12, the center structure 16 to which the bow structure 12 and the stern structure 14 are joined in accordance with changes in the end shapes of the plates 12P and 14P and the aggregates 12B and 14B. The shape of the plate and aggregate at both ends is complementary to the end shapes of the plates 12P and 14P and the aggregates 12B and 14B, so that the bow structure 12, the stern structure 14, and the center structure In the final process of joining 16, work efficiency can be further improved by preparing a member to be fitted between the joints and eliminating the need for welding. FIG. 13 and FIG. 14 illustrate these combinations.

  FIG. 13 is an example in which the protruding portion 26 corresponding to the opening 22 in FIG. 6 is provided on the plate member 16P of the central structure 16. 14 (a) to 14 (e) show the aggregates at the joints of the central structure 16 configured to be complementary to the end shapes of the aggregates 12B and 14B in FIGS. The structure of 16B and the board | plate material 16P is shown. 14 (d) and 14 (e) both correspond to the bore portion 25 of FIG. 12, and FIG. 14 (d) shows the bore portion 25 at the end of the aggregate 16B of the central structure 16. A complementary projecting portion 27 is provided so as to close, but in FIG. 14 (e), a bore portion 28 that is symmetrical to the bore portion 25 is provided.

  In addition, in the floating body structure 20 for a movement, as FIG. 15 shows, the non-joining part 18 can also be covered with sealing materials 29, such as rubber packing, and watertightness can also be given. In the example of FIG. 15, the non-joined portion 18 of the outer outer plate is closed by the sealing material 29 and the watertightness is maintained, but the sealing material 29 may be provided on the partition wall, the longitudinal partition wall, or the inner bottom plate.

  As described above, according to the present embodiment, by providing a non-joined portion in the hull structure of the floating structure for movement, the man-hours in the joining / cutting operation, the bow structure after cutting, and the stern structure It is possible to reduce the number of man-hours for strain relief work and the work for assembling / disassembling work scaffolds. Thereby, the construction period can be shortened and the manufacturing cost can be suppressed.

  Next, a modification of the present embodiment will be described with reference to FIGS. In the floating structure 20 for movement of the embodiment, as shown in FIG. 3, all the non-joining portions 18 are provided within a predetermined range from the horizontal neutral axis N. However, in the modified example of FIG. 16, only a plate material constituting a part of the upper deck, a ship bottom, a ship side outer plate, only an aggregate material, or only a plate material and an aggregate material are joined. That is, a part of the upper deck and other members including the longitudinal bulkhead are not joined. In the joining cross section shown in FIG. 16, the hull member indicated by the solid line is the joining portion 17 or a member continuous in the longitudinal direction, and the hull member indicated by the broken line is the non-joining portion 18.

  FIG. 17 is a modified example in which the configurations of FIG. 3 and FIG. 16 are combined. Like FIG. 16, the hull member indicated by the solid line in the joint cross section shown in FIG. A hull member indicated by a broken line is the non-joining portion 18. That is, a part of the upper deck and a part of the longitudinal partition wall are not joined.

  In the modified examples as shown in FIGS. 16 and 17, the same effects as those of the embodiment can be obtained. In addition, the working efficiency can be further improved by reducing the number of high-altitude work points that require assembly / disassembly work of the work scaffold in the floating structure for movement.

  Also in the modified example, the sealing material 29 is appropriately disposed in the non-joint portion in accordance with the stability requirement and propulsion performance requirement of the floating structure for movement.

DESCRIPTION OF SYMBOLS 10 Ship-shaped floating structure 12 Bow part structure 14 Stern part structure 16 Center part structure 12B, 14B, 16B Aggregate 12P, 14P, 16P Board | plate material 17 Cutting part or joined part 18 Non-joint part 20 Moving floating structure 21 , 22 Opening 23 Girder material 24 Snip 25 Drilling part 26, 27 Protrusion part 29 Sealing material

Claims (12)

A floating structure for movement composed of the bow structure and the stern structure among the bow structure, the center structure, and the stern structure of the ship-shaped floating structure,
A part of the hull structure member that contributes to the bending strength in the longitudinal direction in the boat-shaped floating structure is a non-joined portion that is not joined at the boundary between the bow structure and the stern structure. A floating structure for moving.   The floating structure for movement according to claim 1, wherein the non-joining portion includes at least one of a plate material and an aggregate.   3. The floating structure for movement according to claim 1, wherein plate members constituting a ship bottom or a ship side outer plate are joined at the boundary. 4.   The floating structure for movement according to claim 3, wherein aggregate provided on the ship bottom or the ship side skin is joined at the boundary.   The floating structure for movement according to any one of claims 1 to 4, wherein the non-joining portion is sealed with a sealing material.   The non-joining portion is provided to the aggregate, and a clearance having a predetermined width is provided between the aggregate of the bow structure and the aggregate of the stern structure. The floating structure for movement as described in any one of Claims 1-5.   The floating structure for movement according to claim 6, wherein a girder joined to a plate is attached to an end of the aggregate forming the clearance.   The moving floating body structure according to claim 6, wherein an end of the aggregate forming the clearance is a snip end.   The floating structure for movement according to claim 8, wherein the hypotenuse of the snip end has a concave R shape.   The moving floating body structure according to claim 6, wherein an end portion of the aggregate forming the clearance has a hollow portion near the plate material.   In the board | plate material, the opening for relieving stress concentration is provided in the said boundary, The floating structure for a movement as described in any one of Claims 1-10 characterized by the above-mentioned.   The joint portion of the bow structure and the stern structure to the central structure has a shape complementary to the joint of the central structure. The floating structure for movement according to claim 1.

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