Jacket-type structural system and method for arranging the jacket-type structural system

Abstract

To provide a jacket-type structure system and a method for arranging the jacket-type structure system, which can improve work efficiency and costs. [Solution] The jacket-type structure system includes a jacket-type structure including a plurality of legs and a plurality of upper girders, and a walkway, wherein the plurality of upper girders includes a first upper girder connecting a first leg included in the plurality of legs and a second leg included in the plurality of legs, and the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder.

Description

[Technical Field]

[0001] The present disclosure relates to a jacketed structural system and a method for deploying a jacketed structural system. [Background technology]

[0002] Conventionally, portable walkways for construction work have been used. Patent document 1 discloses that walkways can be arranged in any direction using steel beams spanning steel columns, and can be used as walkways for workers or as scaffolding for work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-93718 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the walkway in Patent Document 1 leaves room for improvement in terms of work efficiency and costs during construction.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a jacket-type structure system and a method for arranging a jacket-type structure system that can improve work efficiency and costs. [Means for solving the problem]

[0006] A jacket-type structure system according to one embodiment of the present disclosure is a jacket-type structure system including a jacket-type structure including a plurality of legs and a plurality of upper girders, and a walkway, wherein the plurality of upper girders include a first upper girder connecting a first leg included in the plurality of legs and a second leg included in the plurality of legs, and the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder.

[0007] A method for arranging a jacket-type structure system according to one embodiment of the present disclosure is characterized by including a walkway arranging step for arranging the walkway in the jacket-type structure so that the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder, and after the walkway arranging step, a stage arranging step for arranging the polygonal stage in the jacket-type structure so that one side of the polygonal stage is parallel to the first upper girder. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, it is possible to provide a jacket-type structure system and a method for arranging a jacket-type structure system that can improve work efficiency and costs. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a jacket-type structural system according to one embodiment. [Figure 2] FIG. 1 is a plan view of a jacket-type structure system according to one embodiment. [Figure 3] FIG. 1 is a side view of a walkway according to one embodiment. [Figure 4] FIG. 2 is a plan view of a walkway according to one embodiment. [Figure 5] FIG. 1 is a perspective view showing a state in which a walkway according to one embodiment is arranged in a jacket-type structure. [Figure 6] FIG. 10 is a diagram showing a connecting portion of a walkway according to one embodiment. [Figure 7] FIG. 2 is a perspective view of a first scaffold according to one embodiment. [Figure 8] FIG. 10 is a perspective view of a second scaffold according to one embodiment. [Figure 9] FIG. 10 is a perspective view of a third scaffold according to one embodiment. [Figure 10] FIG. 10 is a perspective view of a fourth scaffold according to one embodiment. [Figure 11] FIG. 10 is a perspective view of a fifth scaffold according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a jacket-type structure system 1 according to an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a perspective view of the jacket-type structure system 1. Fig. 2 is a plan view of the jacket-type structure system 1.

[0011] The jacket-type structure system 1 is a system configuration including a jacket-type structure 10 under construction. As shown in FIGS. 1 and 2, the jacket-type structure system 1 includes a jacket-type structure 10, a walkway 20, a scaffolding system 30, a polygonal stage 40, a lifting section 50, and a passageway 60.

[0012] The jacket-type structure 10 is used, for example, when constructing a pier or the like on the sea. In this embodiment, the jacket-type structure 10 included in the jacket-type structure system 1 is currently under construction.

[0013] The jacket-type structure 10 includes a plurality of legs 11 and a plurality of upper girders 12. In the following description, the horizontal direction in which a first upper girder 12A included in the plurality of upper girders 12 extends is referred to as a first direction D1, and the direction perpendicular to the first direction D1 is referred to as a second direction D2. In this embodiment, the first direction D1 is the longitudinal direction of the jacket-type structure 10.

[0014] The legs 11 are members that extend vertically upward, with their lower ends cast into the ground, such as the seabed, etc. The legs 11 are provided at regular intervals in each of the first direction D1 and the second direction D2.

[0015] The multiple legs 11 include a first leg 11A, a second leg 11B, a third leg 11C, and a fourth leg 11D. The first leg 11A is one of the multiple legs 11. The second leg 11B is one of the multiple legs 11 and is located adjacent to the first leg 11A in the first direction D1. The third leg 11C is one of the multiple legs 11 and is located adjacent to the first leg 11A in the second direction D2. The fourth leg 11D is one of the multiple legs 11 and is located adjacent to the third leg 11C in the first direction D1 and adjacent to the second leg 11B in the second direction D2.

[0016] The upper girders 12 connect the upper ends of adjacent legs 11 in the first direction D1 or the second direction D2. A plurality of upper girders 12 are provided so as to connect the upper ends of adjacent legs 11 in the first direction D1 or the second direction D2 among the plurality of legs 11 provided at intervals. Each of the plurality of upper girders 12 extends along the first direction D1 or the second direction D2.

[0017] The multiple upper girders 12 include a first upper girder 12A and a second upper girder 12B. The first upper girder 12A is one of the multiple upper girders 12 and connects the first leg 11A and the second leg 11B. The second upper girder 12B is one of the multiple upper girders 12 and connects the third leg 11C and the fourth leg 11D. The first upper girder 12A and the second upper girder 12B extend along a first direction D1. The longitudinal direction of the second upper girder 12B is parallel to the longitudinal direction of the first upper girder 12A. In this specification, the phrase "the longitudinal direction of the second upper girder 12B and the longitudinal direction of the first upper girder 12A are parallel" means that the angle between the longitudinal direction of the second upper girder 12B and the longitudinal direction of the first upper girder 12A is within ±40 degrees.

[0018] The jacket-type structure 10 having the above-described configuration may be used as a pier or the like by providing a floor plate (not shown) on the upper girder 12 after fabrication, for example.

[0019] The walkway 20 is used in the fabrication of the jacket-type structure 10. For example, the walkway 20 is used by workers to move between each component of the jacket-type structure system 1 in the fabrication of the jacket-type structure 10. Furthermore, the walkway 20 is used by workers in the fabrication of the jacket-type structure 10 to perform stainless steel lining of each component of the jacket-type structure 10, painting of each component of the jacket-type structure 10, and welding of narrow portions of the jacket-type structure 10 (for example, the connection portion between a sub-beam (not shown) provided on the jacket-type structure 10 and the leg 11 or upper girder 12). In the fabrication of the jacket-type structure 10, multiple walkways 20 are used.

[0020] The walkway 20 is installed on the upper girder 12. The walkway 20 is arranged to extend along the first direction D1. In other words, the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A. In this specification, "the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A" means that the angle between the longitudinal direction of the walkway 20 and the longitudinal direction of the first upper girder 12A is within ±40 degrees.

[0021] The walkway 20 includes a first walkway 21 and a second walkway 22. The first walkway 21 and the second walkway 22 are arranged between the first upper girder 12A and the second upper girder 12B in the second direction D2. The first walkway 21 is located between the first leg 11A and the second leg 11B in the first direction D1. The second walkway 22 is located on the opposite side of the first leg 11A across the second leg 11B in the first direction D1. The longitudinal length of the first walkway 21 is longer than the longitudinal length of the second walkway 22.

[0022] The first walkway 21 is disposed at a distance from the first leg 11A. The first walkway 21 and the second walkway 22 are disposed at a distance from the second leg 11B. As will be described in detail later, the first walkway 21 is connected to the first leg 11A via a first connecting scaffold 36 (connecting member) provided in the scaffolding system 30. The first walkway 21 and the second walkway 22 are connected to the second leg 11B via a second connecting scaffold 37 provided in the scaffolding system 30.

[0023] Next, we will explain the specific configuration of the walkway 20. The first walkway 21 and the second walkway 22 have the same basic configuration except for the length in the longitudinal direction, so they will be collectively explained as the walkway 20.

[0024] Fig. 3 is a side view of the walkway 20. Fig. 4 is a plan view of the walkway 20. Fig. 5 is a perspective view showing the walkway 20 arranged in the jacket-type structure 10. As shown in Figs. 3 to 5, the walkway 20 comprises a pair of main girders 20a, a connecting member 20b, a scaffolding board 20c, and a pair of handrails 20d.

[0025] The main girder 20a is a member placed on the upper girder 12. The main girder 20a extends along the first direction D1. As shown in Fig. 4, the pair of main girder 20a are provided opposite each other in the second direction D2.

[0026] The connecting members 20b extend along the second direction D2 and connect a pair of main beams 20a together. A plurality of connecting members 20b are provided at intervals in the first direction D1.

[0027] The scaffolding plank 20c is a flat member on which a worker stands. The scaffolding plank 20c is, for example, a steel plate with drainage holes. The scaffolding plank 20c is spanned between a pair of main girders 20a. The scaffolding plank 20c is supported by the main girders 20a and connecting members 20b.

[0028] A pair of handrails 20d are provided on each of the pair of main girders 20a. The handrails 20d have a support post 20d1 and a cross member 20d2. The support post 20d1 extends in the vertical direction. The lower end of the support post 20d1 is fixed to the main girders 20a. The multiple support posts 20d1 are arranged at intervals in the first direction D1. The cross member 20d2 extends in the first direction D1 and bridges between adjacent support posts 20d1. The multiple cross members 20d2 are arranged at intervals in the vertical direction.

[0029] 3, a first connecting portion 20e (connecting portion) is provided at one end of the main girder 20a in the first direction D1, and a second connecting portion 20f (connecting portion) is provided at the other end of the main girder 20a in the first direction D1. The first connecting portion 20e and the second connecting portion 20f are used to connect one walkway 20 to another walkway 20 adjacent to this walkway 20 in the first direction D1.

[0030] FIG. 6 is a diagram showing the connecting portions 20e and 20f. As shown in FIG. 6, the first connecting portion 20e has a first recess 20e1 recessed upward from the lower surface of the main girder 20a. The first recess 20e1 has a first abutment surface 20e2 facing downward. The second connecting portion 20f has a second recess 20f1 recessed downward from the upper surface of the main girder 20a. The second recess 20f1 has a shape corresponding to the first recess 20e1. The second recess 20f1 has a second abutment surface 20f2 facing upward.

[0031] The first connecting portion 20e and the second connecting portion 20f are formed, for example, as follows. That is, the main girder 20a has an upper plate 20a1, a lower plate 20a2 provided below the upper plate 20a1, and a connecting plate 20a3 connecting the upper plate 20a1 and the lower plate 20a2. At one end of the main girder 20a in the first direction D1, the upper plate 20a1 protrudes outward in the first direction D1 more than the lower plate 20a2, and the connecting plate 20a3 connects the upper plate 20a1 and the lower plate 20a2 in a stepped manner. This forms the first connecting portion 20e. At the other end of the main girder 20a in the first direction D1, the lower plate 20a2 protrudes outward in the first direction D1 more than the upper plate 20a1, and the connecting plate 20a3 connects the upper plate 20a1 and the lower plate 20a2 in a stepped manner. This forms the second connecting portion 20f.

[0032] Of the two corridors 20 adjacent to each other in the first direction D1, the first recess 20e1 of one corridor 20 and the second recess 20f1 of the other corridor 20 are engaged so that the first abutment surface 20e2 and the second abutment surface 20f2 abut against each other. In this state, the first connecting portion 20e and the second connecting portion 20f are fixed to each other using a fastening member T, thereby connecting the corridors 20 adjacent to each other in the first direction D1.

[0033] The scaffolding system 30 is used in the fabrication of the jacket-type structure 10. For example, in fabricating the jacket-type structure 10, the scaffolding system 30 is used by workers to connect the legs 11 and the upper girders 12 by welding, bolting, or the like, and to paint the area including the legs 11 and the upper girders 12. In this embodiment, when the scaffolding system 30 is attached to the jacket-type structure 10 under fabrication, the components of the jacket-type structure 10 may be temporarily fastened to each other, or the components may be fixed.

[0034] 2, the scaffolding system 30 includes a first scaffolding 31, a second scaffolding 32, a third scaffolding 33, a fourth scaffolding 34, and a fifth scaffolding 35. In constructing the jacket-type structure 10, a plurality of each of the first scaffolding 31, the second scaffolding 32, the third scaffolding 33, the fourth scaffolding 34, and the fifth scaffolding 35 in the scaffolding system 30 are used.

[0035] The first scaffolding 31 is one of the scaffolding in the scaffolding system 30. As shown in Figs. 1 and 2, the first scaffolding 31 is provided, for example, at the intersection of two upper girders 12 that are perpendicular to each other.

[0036] Fig. 7 is a perspective view of the first scaffolding 31. As shown in Fig. 7, the first scaffolding 31 includes an upper frame 31a, a first support column 31b, a second support column 31c, a first horizontal beam 31d, a second horizontal beam 31e, a detachable ladder 31f, and a first scaffolding board 31g. The upper frame 31a, the first support column 31b, the second support column 31c, the first horizontal beam 31d, and the second horizontal beam 31e constitute a scaffolding frame member F1.

[0037] The upper frame 31a is formed of steel, such as H-beams. The upper frame 31a is formed in a rectangular shape having a pair of first sides 31a1 facing each other and a pair of second sides 31a2 facing each other and connected to the pair of first sides 31a1. The upper frame 31a abuts from above against two upper girders 12 that are perpendicular to each other. This allows the upper girders 12 to support the weight of the first scaffolding 31.

[0038] The first support pillar 31b hangs down from one end of one of the pair of second sides 31a2. The first support pillar 31b connects the upper frame 31a and the first horizontal beam 31d. The second support pillar 31c hangs down from the other end of the one second side 31a2. The second support pillar 31c connects the upper frame 31a and the second horizontal beam 31e. The first support pillar 31b and the second support pillar 31c are provided with a fixed ladder 31h that allows a worker to move up and down the first scaffolding 31.

[0039] The first horizontal beam 31d extends horizontally from the lower end of the first support pillar 31b. The second horizontal beam 31e extends horizontally from the lower end of the second support pillar 31c. A first scaffolding board 31g is installed between the first support pillar 31b and the second support pillar 31c. Handrails 31i are provided on the first horizontal beam 31d and the second horizontal beam 31e.

[0040] The detachable ladder 31f is provided to enable a worker to move up and down on the first scaffolding 31. The detachable ladder 31f hangs down from the other of the pair of second sides 31a2.

[0041] The first scaffolding board 31g is a flat member on which a worker stands when working to fabricate the jacket-type structure 10. The first scaffolding board 31g is bridged between the first horizontal beam 31d and the second horizontal beam 31e.

[0042] The method of attaching the first scaffolding 31 to the jacket-type structure 10 will be described. First, using a crane or the like (not shown), the scaffolding frame member F1 is positioned so that the upper frame 31a abuts against two upper girders 12 that are perpendicular to each other. At this time, as shown in FIG. 1, the scaffolding frame member F1 is positioned so that the first support column 31b and the second support column 31c are positioned closer to the center of the jacket-type structure 10 in the first direction D1. Furthermore, the scaffolding frame member F1 is positioned so that one of the two upper girders 12 is sandwiched between the first support column 31b and the second support column 31c. This allows the scaffolding frame member F1 to be stably attached to the jacket-type structure 10. Then, a detachable ladder 31f is suspended from the upper frame 31a. The first scaffolding board 31g is spanned between the first horizontal beam 31d and the second horizontal beam 31e. After the scaffolding frame member F1 is positioned, the removable ladder 31f and the first scaffolding board 31g are attached to the scaffolding frame member F1, thereby preventing the removable ladder 31f and the first scaffolding board 31g from interfering with the work of attaching the scaffolding frame member F1 to the jacket-type structure 10.

[0043] The second scaffold 32 is one of the scaffolds in the scaffold system 30. The second scaffold 32 is provided, for example, on the leg 11, as shown in FIGS.

[0044] Figure 8 is a perspective view of the second scaffolding 32. As shown in Figure 8, the second scaffolding 32 includes an upper frame 32a, a first support pillar 32b, a second support pillar 32c, a third support pillar 32d, a fourth support pillar 32e, a first scaffolding plank 32h, and a second scaffolding plank 32i. The upper frame 32a, the first support pillar 32b, the second support pillar 32c, the third support pillar 32d, and the fourth support pillar 32e constitute a scaffolding frame member F2.

[0045] The upper frame 32a is formed of steel, such as H-beams. The upper frame 32a is formed in a rectangular shape having a pair of first sides 32a1 facing each other and a pair of second sides 32a2 facing each other and connected to the pair of first sides 32a1. The upper frame 32a abuts from above against two upper girders 12 that are perpendicular to each other. This allows the upper girders 12 to support the weight of the second scaffolding 32. A roof 32j may be provided on top of the upper frame 32a.

[0046] The first support pillar 32b, the second support pillar 32c, the third support pillar 32d, and the fourth support pillar 32e hang down from the four corners of the rectangular upper frame 32a. More specifically, the first support pillar 32b hangs down from one end of one of the pair of second sides 32a2. The second support pillar 32c hangs down from the other end of the one second side 32a2. The third support pillar 32d hangs down from one end of the other of the pair of second sides 32a2. The fourth support pillar 32e hangs down from the other end of the other second side 32a2. Fixed ladders 32g are attached to the first support pillars 32b, the second support pillars 32c, the third support pillars 32d, and the fourth support pillars 32e to enable workers to move up and down the second scaffolding 32.

[0047] A scaffolding board support portion 32f is provided at the lower end of each of the first support 32b, the second support 32c, the third support 32d, and the fourth support 32e. The scaffolding board support portion 32f is provided to bridge the first scaffolding board 32h between the first support 32b and the second support 32c, and to bridge the second scaffolding board 32i between the third support 32d and the fourth support 32e. The scaffolding board support portion 32f is provided at the lower end of each of the supports 32b to 32e via a hinge portion 32f1. This allows the scaffolding board support portion 32f to rotate around the hinge portion 32f1 as the axis of rotation between a folded state in which the board surface faces horizontally and is close to the supports 32b to 32e, and an unfolded state in which the board surface faces vertically.

[0048] The first scaffolding plank 32h and the second scaffolding plank 32i are flat members on which workers stand when fabricating the jacket-type structure 10. The first scaffolding plank 32h is bridged between the unfolded scaffolding plank support parts 32f provided at the lower ends of the first support column 32b and the second support column 32c. The second scaffolding plank 32i is bridged between the unfolded scaffolding plank support parts 32f provided at the lower ends of the third support column 32d and the fourth support column 32e.

[0049] A method of attaching the second scaffolding 32 to the jacket-type structure 10 will be described. First, using a crane or the like (not shown), the scaffolding frame member F2 is positioned so that the upper frame 32a abuts against two upper girders 12 that are perpendicular to each other. At this time, the scaffolding board support portion 32f is in a folded state to prevent interference with the jacket-type structure 10. As shown in FIG. 1 , the scaffolding frame member F2 is positioned so that the upper portion of the leg 11 is housed inside the scaffolding frame member F2. The scaffolding frame member F2 is positioned so that one of the two upper girders 12 is sandwiched between the first support column 32b and the second support column 32c and between the third support column 32d and the fourth support column 32e, and so that the other of the two upper girders 12 is sandwiched between the first support column 32b and the third support column 32d and between the second support column 32c and the fourth support column 32e. This allows the scaffold frame member F2 to be stably attached to the jacket-type structure 10. Then, the scaffold plank support portion 32f is rotated from the folded state to the unfolded state. The first scaffold plank 32h is spanned between the scaffold plank support portions 32f provided at the lower ends of the first support column 32b and the second support column 32c. The second scaffold plank 32i is spanned between the scaffold plank support portions 32f provided at the lower ends of the third support column 32d and the fourth support column 32e. By attaching the first scaffold plank 32h and the second scaffold plank 32i to the scaffold frame member F2 after positioning the scaffold frame member F2, it is possible to prevent the first scaffold plank 32h and the second scaffold plank 32i from interfering with the work of attaching the scaffold frame member F2 to the jacket-type structure 10.

[0050] The third scaffolding 33, the fourth scaffolding 34, and the fifth scaffolding 35 are joint scaffolding. Joint scaffolding is scaffolding that is assembled at the production site of the jacket-type structure 10 by connecting beam members, supports, horizontal connecting members, etc. using joint fittings such as joints. The size and shape of joint scaffolding can be changed by changing the arrangement of the beam members, supports, horizontal connecting members, etc., so that it can be installed, for example, in narrow sections or joint parts of the jacket-type structure 10 where it would be difficult to install the first scaffolding 31 or the second scaffolding 32.

[0051] The third scaffolding 33 is provided for the leg 11, as shown in Figures 1 and 2. The third scaffolding 33 is provided so that the upper part of the leg 11 is housed inside the third scaffolding 33. The third scaffolding 33 is used, for example, for welding the lower part of the upper girder 12, or for welding the leg 11 to the upper girder 12. The third scaffolding 33 is also provided so that at least a part of it is disposed between the leg 11 and the walkway 20, and may be used to connect the leg 11 and the walkway 20.

[0052] Fig. 9 is a perspective view of the third scaffolding 33. As shown in Fig. 9, the third scaffolding 33 includes a first beam member 33a, a second beam member 33b, a pair of first supports 33c, a pair of second supports 33d, a horizontal connecting member 33e, a scaffolding board support member 33f, and a scaffolding board 33g.

[0053] The first beam member 33a and the second beam member 33b are members placed on the upper girder 12. The first beam member 33a and the second beam member 33b are formed of steel such as L-shaped steel. The first beam member 33a and the second beam member 33b are arranged parallel to each other with a gap between them.

[0054] The first support columns 33c and the second support columns 33d are formed, for example, from steel pipes. The pair of first support columns 33c are attached to both ends of the first beam member 33a. The first support columns 33c hang down from the first beam member 33a. The pair of second support columns 33d are attached to both ends of the second beam member 33b. The second support columns 33d hang down from the second beam member 33b. The first support columns 33c and the second support columns 33d are provided with fixed ladders 33h that allow workers to move up and down the third scaffolding 33.

[0055] The horizontal connecting members 33e are formed of, for example, steel pipes. A plurality of horizontal connecting members 33e connect a pair of first support columns 33c to each other, a pair of second support columns 33d to each other, or a first support column 33c and a second support column 33d to each other, and are arranged so that the overall structure forms a rectangular frame.

[0056] The scaffolding plank support member 33f is formed of, for example, a steel pipe. The scaffolding plank support member 33f is provided to extend horizontally at the bottom of the third scaffolding 33. The scaffolding plank support member 33f is fixed to the first support column 33c, the second support column 33d, or the horizontal connecting member 33e. A plurality of scaffolding plank support members 33f are provided at intervals. The plurality of scaffolding plank support members 33f support the scaffolding planks 33g from below.

[0057] The scaffolding board 33g is a flat member on which a worker stands when working to fabricate the jacket-type structure 10. The scaffolding board 33g is placed on a plurality of scaffolding board support members 33f. As shown in FIG. 2, in a plan view, at least a portion of the scaffolding board 33g is disposed between the walkway 20 and the leg 11. The scaffolding board 33g is disposed only in a portion of the lower part of the third scaffolding 33 so that an opening O is secured inside the third scaffolding 33 through which the leg 11 can be inserted.

[0058] The method of attaching the third scaffolding 33 to the jacket-type structure 10 will be described. First, the first beam member 33a and the second beam member 33b are placed on the upper girder 12. A pair of first supports 33c are attached to both ends of the first beam member 33a, and a pair of second supports 33d are attached to both ends of the second beam member 33b. After that, a plurality of horizontal connecting members 33e and a plurality of scaffolding board support members 33f are installed. A scaffolding board 33g is installed on the plurality of scaffolding board support members 33f.

[0059] As shown in FIG. 2 , the fourth scaffold 34 is provided for a leg 11 (hereinafter also referred to as an expanded diameter leg 11L) among the multiple legs 11, the upper surface portion of which serves as a receiving portion for an upper load being wider than the other legs 11. The fourth scaffold 34 is provided so that the upper portion of the expanded diameter leg 11L is accommodated inside the fourth scaffold 34. The fourth scaffold 34 is used, for example, for welding the lower portion of the upper girder 12 or for welding the expanded diameter leg 11L to the upper girder 12. The fourth scaffold 34 is also provided so that at least a portion thereof is disposed between the expanded diameter leg 11L and the walkway 20, and may be used to connect the expanded diameter leg 11L and the walkway 20.

[0060] Fig. 10 is a perspective view of the fourth scaffolding 34. As shown in Fig. 10, the fourth scaffolding 34 includes a first beam member 34a, a second beam member 34b, a third beam member 34c, a pair of first supports 34d, a pair of second supports 34e, a pair of third supports 34f, a horizontal connecting member 34g, a scaffolding board support member 34h, and a scaffolding board 34i.

[0061] The first beam member 34a, the second beam member 34b, and the third beam member 34c are members placed on the upper girder 12. The first beam member 34a, the second beam member 34b, and the third beam member 34c are formed of steel, such as L-shaped steel. The first beam member 34a and the second beam member 34b are arranged parallel to each other with a gap between them. The third beam member 34c is arranged to extend in a direction perpendicular to the first beam member 34a. The first beam member 34a, the second beam member 34b, and the third beam member 34c are arranged to surround the upper end opening of the expansion leg 11L from three directions.

[0062] The first support columns 34d, the second support columns 34e, and the third support columns 34f are formed, for example, from steel pipes. The pair of first support columns 34d are attached to both ends of the first beam member 34a. The first support columns 34d hang down from the first beam member 34a. The pair of second support columns 34e are attached to both ends of the second beam member 34b. The second support columns 34e hang down from the second beam member 34b. The pair of third support columns 34f are attached to both ends of the third beam member 34c. The third support columns 34f hang down from the third beam member 34c. Fixed ladders 34j are attached to the first support columns 34d, the second support columns 34e, and the third support columns 34f to enable workers to move up and down the fourth scaffolding 34.

[0063] The horizontal connecting members 34g are formed of, for example, steel pipes. A plurality of horizontal connecting members 34g connect a pair of first support columns 34d together, a pair of second support columns 34e together, a pair of third support columns 34f together, or the first support columns 34d and the second support columns 34e together, and are arranged so that the overall structure forms a rectangular frame.

[0064] The scaffolding plank support member 34h is formed of, for example, a steel pipe. The scaffolding plank support member 34h is provided to extend horizontally at the bottom of the fourth scaffolding 34. The scaffolding plank support member 34h is fixed to the first support column 34d, the second support column 34e, the third support column 34f, or the horizontal connecting member 34g. A plurality of scaffolding plank support members 34h are provided at intervals. The plurality of scaffolding plank support members 34h support the scaffolding planks 34i from below.

[0065] The scaffolding board 34i is a flat member on which a worker stands when fabricating the jacket-type structure 10. The scaffolding board 34i is placed on a plurality of scaffolding board support members 34h. As shown in FIG. 2, at least a portion of the scaffolding board 34i is disposed between the walkway 20 and the expansion leg 11L in a plan view. The scaffolding board 34i is disposed only in a portion of the lower part of the fourth scaffolding 34 so that an opening O is secured inside the fourth scaffolding 34 through which the expansion leg 11L can be inserted. In the illustrated example, the scaffolding board 34i is disposed in an L-shape in a plan view.

[0066] The method of attaching the fourth scaffolding 34 to the jacket-type structure 10 will be described. First, the first beam member 34a, the second beam member 34b, and the third beam member 34c are placed on the upper girder 12. A pair of first supports 34d are attached to both ends of the first beam member 34a, a pair of second supports 34e are attached to both ends of the second beam member 34b, and a pair of third supports 34f are attached to both ends of the third beam member 34c. Then, multiple horizontal connecting members 34g and multiple scaffolding board support members 34h are installed. Scaffolding boards 34i are installed on the multiple scaffolding board support members 34h.

[0067] The plurality of third scaffolds 33 and the plurality of fourth scaffolds 34 include a first connecting scaffold 36 (connecting member) provided for the first leg 11A and a second connecting scaffold 37 provided for the second leg 11B. In the illustrated example, the third scaffold 33 is used as the first connecting scaffold 36 and the second connecting scaffold 37. However, when the first leg 11A and the second leg 11B are the expanding legs 11L, the fourth scaffold 34 may be used as the first connecting scaffold 36 and the second connecting scaffold 37.

[0068] The first connecting scaffolding 36 is used for welding the lower part of the first upper girder 12A and for welding the first leg 11A to the first upper girder 12A. The first connecting scaffolding 36 is also used for connecting the first walkway 21 to the first leg 11A and the first upper girder 12A. The first connecting scaffolding 36 is used to fill the gap between the first walkway 21 and the upper end of the first leg 11A. In a plan view, at least a portion of the scaffolding board 33g of the first connecting scaffolding 36 is positioned between the first walkway 21 and the first leg 11A. Workers can move between the first walkway 21 and the first leg 11A and the first upper girder 12A via the first connecting scaffolding 36.

[0069] The shape of the first leg 11A varies depending on the size and shape of the jacket-type structure 10 to be manufactured, and the size of the gap between the first walkway 21 and the first leg 11A also varies. The first connecting scaffolding 36 is formed of a joint scaffold whose size and shape can be changed by changing the arrangement of beam members, supports, horizontal connecting members, etc. Therefore, even if the shape of the first leg 11A or the size of the gap between the first walkway 21 and the first leg 11A varies, it is possible to install a first connecting scaffolding 36 that corresponds to those differences; in other words, the first connecting scaffolding 36 can absorb those differences. This allows the use of a general-purpose walkway 20, reducing the cost of the walkway 20.

[0070] The second connecting scaffolding 37 is used for welding the lower part of the first upper girder 12A and for welding the second leg 11B to the first upper girder 12A. The second connecting scaffolding 37 is also used for connecting the first and second walkways 21 and 22 to the second leg 11B and the first upper girder 12A. The second connecting scaffolding 37 is used to fill the gap between the first and second walkways 21 and 22 and the upper end of the second leg 11B. In a plan view, at least a portion of the scaffolding board 33g of the second connecting scaffolding 37 is positioned between the first and second walkways 21 and 22 and the second leg 11B. Workers can move between the first and second walkways 21 and 22 and the second leg 11B and the first upper girder 12A via the second connecting scaffolding 37.

[0071] 2, the fifth scaffolding 35 is provided at the intersection of two upper girders 12 that are perpendicular to each other. The fifth scaffolding 35 is used for welding the lower part of the upper girders 12, for example. Fig. 11 is a perspective view of the fifth scaffolding 35. As shown in Fig. 11, the fifth scaffolding 35 includes a first beam member 35a, a second beam member 35b, a pair of first supports 35c, a pair of second supports 35d, a horizontal connecting member 35e, a scaffolding board support member 35f, and a scaffolding board 35g.

[0072] The first beam member 35a and the second beam member 35b are members placed on the upper girder 12. The first beam member 35a and the second beam member 35b are formed of steel such as L-shaped steel. The first beam member 35a and the second beam member 35b are arranged parallel to each other with a gap between them.

[0073] The first support columns 35c and the second support columns 35d are formed, for example, from steel pipes. The pair of first support columns 35c are attached to both ends of the first beam member 35a. The first support columns 35c hang down from the first beam member 35a. The pair of second support columns 35d are attached to both ends of the second beam member 35b. The second support columns 35d hang down from the second beam member 35b. The first support columns 35c and the second support columns 35d are provided with fixed ladders 35h that allow workers to move up and down the fifth scaffolding 35.

[0074] The horizontal connecting members 35e are formed of, for example, steel pipes. A plurality of horizontal connecting members 35e connect a pair of first support columns 35c to each other, a pair of second support columns 35d to each other, or a first support column 35c and a second support column 35d to each other, and are arranged so that the overall structure forms a rectangular frame.

[0075] The scaffolding plank support member 35f is formed of, for example, a steel pipe. The scaffolding plank support member 35f is provided to extend horizontally at the bottom of the fifth scaffolding 35. The scaffolding plank support member 35f is fixed to the first support column 35c, the second support column 35d, or the horizontal connecting member 35e. A plurality of scaffolding plank support members 35f are provided at intervals. The plurality of scaffolding plank support members 35f support the scaffolding planks 35g from below.

[0076] The scaffolding board 35g is a flat member on which a worker stands when working to fabricate the jacket-type structure 10. The scaffolding board 35g is placed on a plurality of scaffolding board support members 35f.

[0077] The method of attaching the fifth scaffolding 35 to the jacket-type structure 10 will be described. First, the first beam member 35a and the second beam member 35b are placed on the upper girder 12. A pair of first supports 35c are attached to both ends of the first beam member 35a, and a pair of second supports 35d are attached to both ends of the second beam member 35b. Then, multiple horizontal connecting members 35e and multiple scaffolding board support members 35f are installed. Scaffolding boards 35g are installed on the multiple scaffolding board support members 35f.

[0078] The polygonal stage 40 is a flat plate-like member. The polygonal stage 40 is formed, for example, from a steel plate having drainage holes. Materials and equipment necessary for fabricating the jacket-type structure 10 are temporarily placed on the polygonal stage 40. The materials and equipment include, for example, the components of the scaffoldings 31 to 35 of the scaffolding system 30, welding equipment, welding materials, etc.

[0079] The polygonal stage 40 has, for example, a rectangular shape in a plan view. The polygonal stage 40 is installed on the upper girder 12. The polygonal stage 40 is positioned so that one side is parallel to the first upper girder 12A. Note that "one side of the polygonal stage 40 is parallel to the first upper girder 12A" means that the angle between one side of the polygonal stage 40 and the longitudinal direction of the first upper girder 12A is within ±40 degrees. The polygonal stage 40 and the walkway 20 are positioned close to each other so that workers can move between the walkway 20 and the polygonal stage 40. In this case, the polygonal stage 40 may be positioned higher than the scaffolding boards 20c of the walkway 20.

[0080] The lifting section 50 is provided so that workers can ascend and descend the jacket-type structure 10. The lifting section 50 includes stairs that can be ascended and descended by workers.

[0081] The passage 60 is used by workers to move between each component of the jacket-type structure system 1 during the fabrication of the jacket-type structure 10. The passage 60 is formed by scaffolding boards. The passage 60 includes a first passage 61 and a second passage 62. The first passage 61 extends, for example, along the second direction D2, and connects the polygonal stage 40 and the lifting unit 50. The second passage 62 extends, for example, along the second direction D2, and connects the polygonal stages 40 adjacent to each other in the second direction D2.

[0082] Next, we will explain the method for arranging the jacket-type structure system 1 having the above configuration. The arrangement method includes a scaffolding arrangement step, a walkway arrangement step, a stage arrangement step, and a passage arrangement step.

[0083] In the scaffolding placement step, a first scaffold 31, a second scaffold 32, a third scaffold 33, a fourth scaffold 34, and a fifth scaffold 35 are placed on the jacket-type structure 10.

[0084] In the walkway placement step, the walkway 20 is placed on the jacket-type structure 10 so that the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the upper girder 12.

[0085] The stage placement step is performed after the walkway placement step. In the stage placement step, the polygonal stage 40 is placed on the jacket-type structure 10 so that one side of the polygonal stage 40 is parallel to the first upper girder 12A.

[0086] The passage arrangement step is performed after the stage arrangement step. In the passage arrangement step, the first passage 61 and the second passage 62 are arranged in the jacket-type structure 10.

[0087] As described above, the jacket-type structure system 1 according to this embodiment includes a jacket-type structure 10 including a plurality of legs 11 and a plurality of upper girders 12, and a walkway 20. The plurality of upper girders 12 include a first upper girder 12A that connects a first leg 11A included in the plurality of legs 11 and a second leg 11B included in the plurality of legs 11. The longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A. The above configuration can reduce the cost of the jacket-type structure system 1. For example, when connecting a walkway to a jacket-type structure using a connecting member, if the walkway is positioned diagonally relative to the first upper girder, the distance between the first upper girder and the walkway will vary along the longitudinal direction of the walkway, requiring auxiliary members of different sizes as connecting members, which increases the cost of the jacket-type structure system. In this embodiment, the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A, so the distance between the first upper girder 12A and the walkway 20 along the longitudinal direction of the walkway 20 is approximately uniform. For example, when connecting the walkway 20 to the jacket-type structure 10 using a connecting member, the size of the connecting member can be unified, thereby reducing the cost of the jacket-type structure system 1. Furthermore, the above configuration can improve work efficiency when fabricating the jacket-type structure 10. That is, for example, if the walkway is arranged diagonally with respect to the first upper girder, there will be places where the gap between the first upper girder and the walkway is large, making it difficult for workers to move between the walkway and the jacket-type structure. In this embodiment, the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A, so workers can easily move between the walkway 20 and the jacket-type structure 10, improving work efficiency. Furthermore, for example, if the walkway is placed diagonally relative to the first upper girder, the connection between the first upper girder and the walkway will be in point contact, resulting in increased stress at the connection. In this case, the strength of the first upper girder will be weakened at the connection, requiring reinforcement using reinforcing members or the like, which increases the cost of the jacket-type structure system. In this embodiment, the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A, thereby reducing stress at the connection between the first upper girder 12A and the walkway 20. Therefore, there is no need to provide reinforcing members or the like to reinforce the first upper girder 12A, thereby reducing the cost of the jacket-type structure system 1. As a result, it is possible to provide a jacket-type structure system 1 that can improve work efficiency and costs.

[0088] Also, the walkway 20 is spaced apart from the first leg 11A. This configuration prevents the walkway 20 from hiding the portion of the first leg 11A that needs to be welded. Also, it is possible to easily provide space for providing a connecting member that connects the walkway 20 to the jacket-type structure 10.

[0089] In addition, the walkway 20 is connected to the first leg 11A via a connecting member (first connecting scaffolding 36). According to this configuration, by connecting the walkway 20 and the first leg 11A via a connecting member (first connecting scaffolding 36), even if the shape of the first leg 11A varies, the difference can be absorbed by the connecting member, allowing the use of a general-purpose walkway 20. Therefore, the cost of the walkway 20 can be further reduced.

[0090] The connecting member is a first connecting scaffold 36 . According to this configuration, welding between the first leg 11A and the first upper girder 12A can be performed more easily using the first connecting scaffolding 36, and work efficiency is further improved.

[0091] The jacket-type structure system 1 further includes a polygonal stage 40, one side of which is parallel to the first upper girder 12A. The walkway 20 is arranged on the polygonal stage 40 so that workers can move thereon. According to this configuration, materials and equipment temporarily placed on the polygonal stage 40 can be easily transported using the walkway 20, further improving work efficiency.

[0092] The walkway 20 includes a first walkway 21 located between the first leg 11A and the second leg 11B, and a second walkway 22 located on the opposite side of the second leg 11B from the first leg 11A. The longitudinal length of the first walkway 21 is longer than the longitudinal length of the second walkway 22. According to this configuration, it is possible to selectively use the first walkway 21 and the second walkway 22, which have different lengths. By using the first walkway 21, it is possible to improve the installation efficiency of the walkway 20, and by using the second walkway 22, it is possible to prevent the walkway 20 from protruding from the end of the jacket-type structure 10.

[0093] The upper girders 12 further include a second upper girder 12B that connects a third leg 11C included in the legs 11 and a fourth leg 11D included in the legs 11. The longitudinal direction of the second upper girder 12B is parallel to the longitudinal direction of the first upper girder 12A. The walkway 20 is disposed between the first upper girder 12A and the second upper girder 12B. According to this configuration, workers can access both the first upper girder 12A and the second upper girder 12B from the walkway 20, further improving work efficiency.

[0094] In addition, at the ends of the corridor 20, connecting portions 20e and 20f for connecting to other corridors 20 are provided. This configuration allows the walkway 20 to be easily connected to other walkways 20.

[0095] The method for arranging the jacket-type structure system 1 according to this embodiment includes a walkway arranging step of arranging the walkway 20 on the jacket-type structure 10 so that the longitudinal direction of the walkway 20 is parallel to the longitudinal direction of the first upper girder 12A, and after the walkway arranging step, a stage arranging step of arranging the polygonal stage 40 on the jacket-type structure 10 so that one side of the polygonal stage 40 is parallel to the first upper girder 12A. According to the above configuration, the polygonal stage 40 is placed after the walkway 20 is placed, so workers can use the placed walkway 20 to move to the location where the polygonal stage 40 is to be placed, making it easy to install the polygonal stage 40. Also, by positioning the lighter walkway 20 first, the polygonal stage 40 can be positioned more accurately. This further improves work efficiency.

[0096] The present disclosure is not limited to the above-described embodiment described with reference to the drawings, and various modifications are possible within the technical scope thereof.

[0097] For example, the shapes of the third scaffolding 33, the fourth scaffolding 34, and the fifth scaffolding 35 shown in Figures 9 to 11 are examples, and the size and shape of the third scaffolding 33, the fourth scaffolding 34, and the fifth scaffolding 35 can be changed as appropriate depending on the size and shape of the jacket-type structure 10 to be manufactured.

[0098] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0099] (Addendum) The jacket-type structure system according to the embodiment and the method of arranging the jacket-type structure system can be understood, for example, as follows.

[0100] <1> A jacket-type structure system according to one embodiment of the present disclosure is a jacket-type structure system including a jacket-type structure including a plurality of legs and a plurality of upper girders, and a walkway, wherein the plurality of upper girders include a first upper girder connecting a first leg included in the plurality of legs and a second leg included in the plurality of legs, and the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder. According to the above configuration, the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder, so the distance between the first upper girder and the walkway is uniform in the longitudinal direction of the walkway.For example, when the walkway is connected to a jacket-type structure using a connecting member, the size of the connecting member can be unified, thereby reducing the cost of the jacket-type structure system. Furthermore, according to the above configuration, the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder, so workers can easily move between the walkway and the jacket-type structure, improving work efficiency. Furthermore, with the above configuration, the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder, so stress generated at the connection between the first upper girder and the walkway can be reduced. Therefore, there is no need to provide reinforcing members to reinforce the first upper girder, and the cost of the jacket-type structure system can be reduced. As a result, a jacket-type structure system can be provided that can improve work efficiency and costs.

[0101] <2> the above <1> In the jacket-type structure system according to the above, the walkway may be spaced apart from the first leg. This configuration prevents the walkway from obscuring the portion of the first leg that needs to be welded, and also makes it easy to provide space for a connecting member that connects the walkway to the jacket-type structure.

[0102] <3> the above <1> or <2> In the jacket-type structure system according to the above, the walkway may be connected to the first leg via a connecting member. According to the above configuration, by connecting the walkway and the first leg via a connecting member, even if the shape of the first leg varies, the connecting member can absorb the differences, allowing the use of a general-purpose walkway, thereby further reducing the cost of the walkway.

[0103] <4> the above <3> In the jacket-type structure system according to the above, the connecting member may be a scaffold. According to the above configuration, the first leg and the first upper girder can be welded together more easily using the scaffolding as the connecting member, thereby further improving work efficiency.

[0104] <5> the above <1> from <4> In the jacket-type structure system according to any one of the above, the system may further include a polygonal stage having one side parallel to the first upper girder, and the walkway may be arranged so that workers can move on the polygonal stage. According to the above configuration, materials and equipment temporarily placed on the polygonal stage can be easily transported using the walkway, further improving work efficiency.

[0105] <6> the above <1> from <5> In the jacket-type structure system according to any one of the above, the walkway includes a first walkway located between the first leg and the second leg, and a second walkway on the opposite side of the second leg from the first leg, and the longitudinal length of the first walkway may be longer than the longitudinal length of the second walkway. According to the above configuration, the first and second walkways, which are different in length, can be used selectively. By using the first walkway, the installation efficiency of the walkways can be improved, and by using the second walkway, the walkway can be prevented from protruding from the end of the jacket-type structure.

[0106] <7> the above <1> from <6> In the jacket-type structure system according to any one of the above, the plurality of upper girders may further include a second upper girder connecting a third leg included in the plurality of legs and a fourth leg included in the plurality of legs, the longitudinal direction of the second upper girder being parallel to the longitudinal direction of the first upper girder, and the walkway may be arranged between the first upper girder and the second upper girder. According to the above configuration, workers can access both the first upper girder and the second upper girder from the walkway, further improving work efficiency.

[0107] <8> the above <1> from <7> In the jacket-type structure system according to any one of the above, a connecting portion may be provided at an end of the walkway to connect to another walkway. According to the above configuration, the walkway can be easily connected to other walkways.

[0108] <9> A method for arranging a jacket-type structure system according to one embodiment of the present disclosure is characterized by including a walkway arranging step for arranging the walkway in the jacket-type structure so that the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder, and after the walkway arranging step, a stage arranging step for arranging the polygonal stage in the jacket-type structure so that one side of the polygonal stage is parallel to the first upper girder. According to the above configuration, the polygonal stage is placed after the walkway is placed, so workers can use the placed walkway to move to the location where the polygonal stage will be placed, making it easy to set up the polygonal stage. Also, by positioning the lighter walkway first, the polygonal stage can be positioned more accurately. This further improves work efficiency. [Explanation of symbols]

[0109] 1. Jacket-type structure system 10 Jacket structure Leg 11 11A First Leg 11B 2nd leg 11C Third Leg 11D 4th Leg 12 Upper girder 12A 1st upper girder 12B 2nd upper girder 20 Walkway 20e 1st connection part (connection part) 20f 2nd connecting part (connecting part) 21 First Corridor 22 Second Corridor 36 First connecting scaffold (connecting member) 40 Polygonal Stages

Claims

1. a jacket-type structure including a plurality of legs and a plurality of upper spars; The walkway and A jacket-type structural system comprising: the plurality of upper girders include a first upper spar connecting a first leg included in the plurality of legs and a second leg included in the plurality of legs; The longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder. A jacket-type structure system characterized by:

2. The walkway is spaced from the first leg.

2. The jacket-type structure system according to claim 1.

3. The walkway is connected to the first leg via a connecting member.

3. The jacket-type structural system according to claim 2.

4. The connecting member is a scaffold.

4. The jacket-type structural system according to claim 3.

5. a polygonal stage having one side parallel to the first upper beam; Further provided with The walkway is arranged so that workers can move on the polygonal stage.

2. The jacket-type structure system according to claim 1.

6. The walkway includes a first walkway located between the first leg and the second leg, and a second walkway located on the opposite side of the second leg from the first leg, The length of the first walkway in the longitudinal direction is longer than the length of the second walkway in the longitudinal direction.

2. The jacket-type structure system according to claim 1.

7. The plurality of upper girders include a second upper girder connecting a third leg included in the plurality of legs and a fourth leg included in the plurality of legs; Further comprising: The longitudinal direction of the second upper girder is parallel to the longitudinal direction of the first upper girder, the walkway is disposed between the first upper girder and the second upper girder; 7. A jacket-type structure system according to any one of claims 1 to 6.

8. A connecting portion is provided at the end of the walkway to connect to another walkway.

7. A jacket-type structure system according to any one of claims 1 to 6.

9. A method for arranging a jacket-type structural system according to claim 5, comprising the steps of: a walkway arranging step of arranging the walkway in the jacket-type structure so that the longitudinal direction of the walkway is parallel to the longitudinal direction of the first upper girder; a stage placement step of placing the polygonal stage on the jacket-type structure such that one side of the polygonal stage is parallel to the first upper girder after the walkway placement step; A method for arranging a jacket-type structural system, comprising:

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