Structural steel system and construction method of structural steel system

Abstract

To provide a shape steel system capable of being folded without interfering with each other and aligning positions of shape steels when unfolding, and a method for constructing the shape steel system.SOLUTION: Provided is a shape steel system 100 including a hinge portion 10, a first shape steel 20, and a member 30 attached to a side surface of the hinge portion 10 along a longitudinal direction D1 and attached to the side opposite to the first shape steel 20 with the hinge portion 10 interposed therebetween. The hinge portion 10 moves the first shape steel 20 along the longitudinal direction D1 by a distance corresponding to a thickness of a first flange 21 of the first shape steel 20 extending in a direction orthogonal to the longitudinal direction D1 in response to a rotation about a rotation axis of the hinge portion 10, which is a relative rotation between the first shape steel 20 and the member 30. The first shape steel 20 and the member 30 overlap when viewed along the longitudinal direction D1 either before or after the rotation, and do not overlap when viewed along the longitudinal direction D1 on the other hand.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a section steel system and a construction method of a section steel system.

Background Art

[0002] In the construction of structures, steel materials including webs and flanges, such as H-shaped steel and I-shaped steel, may be used. Such steel materials are required to be efficiently transported to the construction site. For example, as disclosed in Patent Document 1, a technique is disclosed in which a large number of rack bodies are aligned and loaded and stored, and then integrally transported and handled, and stable mutual stacking is enabled.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventor of the present application has found a need to make the section steel foldable in order to improve the transportability and construction workability of the section steel at the construction site using these steel materials. When folding two things connected by a hinge, things with protrusions in a plane perpendicular to the rotation axis of the hinge interfere with each other and cannot be folded properly. Therefore, even if a hinge is provided on a section steel including a web and a flange orthogonal to the web so as to bend the web, for example, the section steels interfere with each other and cannot be folded. Further, if the positions of the section steels are shifted to prevent interference during folding, the positions of the section steels will be shifted when the folded section steel is unfolded. Furthermore, the hinge cannot be fixed at a predetermined angle.

[0005] The present invention has been made in view of the circumstances described above, and aims to provide a structural steel system and a method for constructing the structural steel system that can be folded without interfering with each other and can align the positions of the structural steel when unfolding. [Means for solving the problem]

[0006] To solve the aforementioned problems, the present invention proposes the following means. The structural steel system according to the present invention comprises a hinge portion, a first structural steel attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion, and a member attached to the side surface of the hinge portion that is aligned with the longitudinal direction and attached to the opposite side of the hinge portion from the first structural steel, wherein the hinge portion moves the first structural steel along the longitudinal direction by a distance corresponding to the thickness of the first flange of the first structural steel that extends in a direction perpendicular to the longitudinal direction, in response to a rotation of the hinge portion with the rotation axis as the center of rotation and the relative rotation of the first structural steel and the member, and the first structural steel and the member overlap when viewed along the longitudinal direction before and after the rotation, but do not overlap when viewed along the longitudinal direction on the other side.

[0007] According to this invention, the hinge portion rotates with the axis of rotation of the hinge portion as the center of rotation, and in response to the relative rotation between the first structural steel and the member, the first structural steel moves along the longitudinal direction by a distance corresponding to the thickness of the first flange of the first structural steel that extends in a direction perpendicular to the longitudinal direction. The first structural steel and the member overlap along the longitudinal direction before and after the rotation, but do not overlap along the longitudinal direction on the other side.

[0008] Before and after the rotation, the first structural steel and the member overlap, which reduces the overall size of the structural steel. On the other side before and after the rotation, the first structural steel and the member do not overlap. In addition, the hinge section moves the first structural steel in the longitudinal direction of the hinge section by a distance corresponding to the thickness of the first flange. This allows for adjustment of the longitudinal position of the hinge section between the first structural steel and the member on the other side before and after the rotation.

[0009] Therefore, with respect to the structural steel according to the present invention, the first structural steel and the member are transported in a state where they are pre-joined by a hinge portion, and the shape of the structural steel can be changed by rotating the hinge portion during construction. Thus, compared to the case where the first structural steel and the member are joined at the construction site, work efficiency can be improved. Structural steel having such effects can be used particularly suitably when constructing offshore structures, for example, at sea where complex work is difficult.

[0010] Furthermore, the longitudinal position of the first flange and the longitudinal position of the flange of the member that extends in a direction perpendicular to the longitudinal direction may be different from each other in one case, but the same in the other case.

[0011] According to this invention, the positions of the first flange of the hinge portion and the flange of the member in the longitudinal direction are different on one hand, and the same on the other hand. By having the positions of the first flange of the first structural steel and the flange of the member differ on one hand, before and after the rotation of the hinge portion, the first flange and the flange can be overlapped. By making the positions of the first flange and the flange in the longitudinal direction of the hinge portion the same on the other hand, before and after the rotation of the hinge portion, the step difference between the first flange and the flange can be eliminated. Therefore, the integrity between the first structural steel and the member can be improved on the other hand, before and after the rotation of the hinge portion.

[0012] Furthermore, the hinge portion may be characterized in that it fixes the first structural steel and the member on the other side.

[0013] According to this invention, the hinge portion fixes the first structural steel and the member on the other side. In other words, it is possible to prevent the hinge portion from unintentionally rotating in the opposite direction and returning to one of the states before and after the rotation of the hinge portion. Therefore, the workability of constructing the structural steel can be improved.

[0014] Furthermore, the hinge portion may include a first hinge portion and a second hinge portion, and the first hinge portion and the second hinge portion may be characterized by fitting together in the other.

[0015] According to this invention, the first hinge portion and the second hinge portion included in the hinge portion are fitted together on one side. In other words, the rotation of the hinge portion is suppressed by the fitting of the first hinge portion and the second hinge portion on the other side. Therefore, it is possible to prevent the hinge portion from rotating excessively or in the reverse direction without having to fix the first hinge portion and the second hinge portion by adhesive or welding before and after the rotation of the hinge portion. This makes it possible to further improve the workability of structural steel.

[0016] Furthermore, the first hinge portion may be characterized in that a first protrusion is provided at the end facing the second hinge portion, and the second hinge portion may be characterized in that a second protrusion is provided at the end facing the first hinge portion, and the longitudinal height of the first protrusion or the longitudinal height of the second protrusion corresponds to the distance.

[0017] According to this invention, in the longitudinal direction of the hinge portion, the height of the first protrusion provided on the first hinge portion, or the height of the second protrusion provided on the second hinge portion, corresponds to a distance corresponding to the thickness of the first flange. In other words, when the first structural steel is moved by a distance corresponding to the thickness of the first flange in the longitudinal direction of the hinge portion, the height of the first protrusion or the height of the second protrusion can be used as a guide.

[0018] Furthermore, the first protrusion may be characterized in that it abuts against the second protrusion on one side.

[0019] According to this invention, the first protrusion abuts against the second protrusion on one side. Here, as described above, the height of the first or second protrusion corresponds to the thickness of the first flange. Therefore, by the abutment of the first and second protrusions, the position of the first structural steel and the member can be moved in the longitudinal direction of the hinge by the thickness of the first flange. Thus, the position of the first flange and the flange can be easily adjusted. Therefore, the workability of construction can be further improved.

[0020] Furthermore, the device may be further equipped with fastening means, wherein the hinge portion is rod-shaped and hollow, and the fastening means is inserted into the hinge portion to fasten the first hinge portion and the second hinge portion.

[0021] According to this invention, the hinge portion is rod-shaped and hollow, and the fastening means is inserted into the hinge portion to fasten the first hinge portion and the second hinge portion together. This allows the first and second hinge portions to fit together on the other side, preventing reverse rotation of the hinge portion, and also allows the hinge portion to be fixed by the fastening means. If it is necessary to intentionally rotate the hinge portion in the reverse direction, the fastening means can be released to release the fixation of the hinge portion. Therefore, the fixing of the structural steel on the other side can be made more secure.

[0022] Furthermore, the fastening means may be a bolt, and the bolt may be fastened to a female threaded portion formed in the hinge portion, or to a nut located at the end of the hinge portion opposite to the end into which the bolt is inserted.

[0023] According to the present invention, the fastening means is a bolt, and the bolt is fastened to a female screw portion formed in the hinge portion or a nut disposed at an end opposite to the end on the side where the bolt is inserted in the hinge portion. Thereby, on one of the front and the rear of the rotation of the hinge portion, the bolt of the hinge portion can be loosened so that the hinge portion can be rotated. On the other of the front and the rear of the rotation of the hinge portion, the hinge portion can be fixed by tightening the bolt. Thus, the fixing of the shaped steel can be performed by bolt fastening. Therefore, the work of fixing the shaped steel can be easily performed.

[0024] Further, the first shaped steel, the member, the hinge portion, and the fastening means may be characterized in that they function as strength members for transmitting a load.

[0025] According to the present invention, the first shaped steel, the member, the hinge portion, and the fastening means function as strength members for transmitting a load. That is, the shaped steel can be used as a strength member for transmitting a load. Therefore, it is possible to provide a shaped steel having high workability as described above for a site that requires a strength member. For example, it can be particularly preferably used when constructing an ocean structure in the sea or the like where complicated work is difficult.

[0026] Further, the first shaped steel may include a first attachment portion for attaching a reinforcing plate which is an attachment plate, and the member may include a second attachment portion for attaching the reinforcing plate.

[0027] According to the present invention, the first shaped steel and the member each include a first attachment portion and a second attachment portion for attaching a reinforcing plate which is an attachment plate. Thereby, by attaching the reinforcing plate to the shaped steel on the other of the front and the rear of the rotation of the hinge portion, the strength of the shaped steel can be further ensured.

[0028] Further, the position of the first attachment portion may be characterized in that, on the other side, it corresponds to the position of the second attachment portion when viewed along the longitudinal direction of the first shaped steel.

[0029] According to this invention, the position of the first mounting portion corresponds to the position of the second mounting portion when viewed along the longitudinal direction of the first structural steel. Therefore, it is possible to easily reinforce the first structural steel and the member by attaching a reinforcing plate on the other side.

[0030] Furthermore, the structural steel according to the present invention is a structural steel system comprising: a hinge portion; a first structural steel attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion; and a member attached to the side surface of the hinge portion that is aligned with the longitudinal direction and attached on the opposite side from the first structural steel, sandwiching the hinge portion, wherein the first structural steel overlaps with the member when the first structural steel and the member are folded by the hinge portion, when viewed along the longitudinal direction, and does not overlap with the member when the first structural steel and the member are not folded by the hinge portion.

[0031] According to this invention, when the first structural steel and the member are folded by the hinge portion, the first structural steel overlaps with the member when viewed along the longitudinal direction, and when the first structural steel and the member are not folded by the hinge portion, the first structural steel does not overlap with the member when viewed along the longitudinal direction. When the first structural steel and the member are folded by the hinge, the first structural steel and the member overlap, which can reduce the overall size of the structural steel. When the first structural steel and the member are not folded by the hinge, the first structural steel and the member do not overlap, which allows the overall size of the structural steel to be increased.

[0032] Therefore, the first structural steel and the member can be folded by the hinge portion, reducing their overall size during transport, and then unfolded by the hinge portion during construction. Thus, the transportation and construction of the structural steel can be carried out easily and efficiently. Structural steel with such effects can be used particularly suitably when constructing offshore structures in places where complex work is difficult, such as at sea.

[0033] Furthermore, the first structural steel may be characterized by being any of the following: H-shaped steel, L-shaped steel, C-shaped steel, I-shaped steel, Z-shaped steel, channel steel, and T-shaped steel.

[0034] According to this invention, the first structural steel is any of the following: H-beam, L-beam, C-beam, I-beam, Z-beam, channel steel, and T-beam. In other words, the first structural steel can be any general-purpose structural steel. Therefore, the first structural steel can be formed without using any special materials.

[0035] Furthermore, the aforementioned member may be characterized by being a structure.

[0036] According to this invention, the member is a structure. In other words, the structural steel according to the present invention can be used as part of a structure. Therefore, construction work on the structure can be carried out efficiently.

[0037] Furthermore, the member may be characterized in that it is a second-shaped steel, and the second-shaped steel is one of H-shaped steel, L-shaped steel, C-shaped steel, I-shaped steel, Z-shaped steel, channel steel, or T-shaped steel.

[0038] According to this invention, the second structural steel is any of the following: H-shaped steel, L-shaped steel, C-shaped steel, I-shaped steel, Z-shaped steel, channel steel, and T-shaped steel. In other words, the member can be made from a general-purpose structural steel. Therefore, the member can be formed without using special materials.

[0039] Furthermore, the present invention relates to a method for constructing a structural steel system, comprising: a hinge portion; a first structural steel attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion; and a member attached to the side surface of the hinge portion that is aligned with the longitudinal direction and attached to the opposite side from the first structural steel, sandwiching the hinge portion, the method comprising: a folding step of folding the first structural steel and the member into a folded state by the hinge portion; and a release step of releasing the folded state of the first structural steel and the member, wherein in the folding step, the first structural steel and the member overlap when viewed along the longitudinal direction, and in the release step, the first structural steel and the member do not overlap when viewed along the longitudinal direction.

[0040] According to this invention, the construction of structural steel systems can be easily carried out. [Effects of the Invention]

[0041] According to the present invention, it is possible to provide a structural steel system that can be folded without interfering with each other, and in which the positions of the structural steel can be aligned when unfolding. [Brief explanation of the drawing]

[0042] [Figure 1] This is a perspective view of the structural steel according to the present invention. [Figure 2] This is a magnified view of the area where the first structural steel and the member are connected at the hinge. [Figure 3] Figure 1 shows the first structural steel and the member of the structural steel in a folded state. [Figure 4] This is an enlarged view of the first structural steel and the member in a folded state. [Figure 5] This is an exploded view of the section where the first structural steel and the member are connected at the hinge. [Figure 6] This shows the state in which the first structural steel and the member have moved relative to each other in the longitudinal direction of the hinge. [Figure 7] In the hinge portion, the first protrusion of the first hinge portion and the second protrusion of the second hinge portion are in contact with each other. [Figure 8] In the hinge section, the first hinge section and the second hinge section are engaged. [Figure 9] This is an enlarged view of the area where the first hinge and the second hinge fit together. [Figure 10] This describes the fastening mechanism and the concept of threading the second hinge portion. [Figure 11] This is a first modified example of the first protrusion of the first hinge and the second protrusion of the second hinge. [Figure 12] This is a second modification of the first protrusion of the first hinge and the second protrusion of the second hinge. [Modes for carrying out the invention]

[0043] A structural steel system 100 according to one embodiment of the present invention will be described below with reference to the drawings. As shown in Figure 1 or Figure 2, the structural steel system 100 includes a hinge portion 10, a first structural steel 20, a member 30, a reinforcing plate 40, and fastening means 50. In this embodiment, the structural steel system 100 is formed by connecting the first structural steel 20 and the member 30 by the hinge portion 10, as shown in Figure 2. A reinforcing plate 40, which is a splice plate, is provided at the connection between the first structural steel 20 and the member 30. With the above configuration, the structural steel system 100 functions as a strength member that transmits loads. The structural steel system 100 is suitably used, for example, in jacket structures of offshore structures.

[0044] The hinge portion 10 rotatably connects the first structural steel 20 and the member 30. The hinge portion 10 includes a tubular first hinge portion 11 and a second hinge portion 12. Tubular means rod-shaped and hollow. The outer shape of the rod in the tubular portion may be cylindrical or prismatic. The specific structure of the hinge portion 10 will be described later. The first structural steel 20 is attached to the side of the hinge portion 10, specifically the side along the longitudinal direction D1 of the hinge portion 10. The first structural steel 20 is one of the following: an H-beam, L-beam, C-beam, I-beam, Z-beam, channel steel, or T-beam. What these have in common is that they include a first flange 21 and a first web 22. The first web 22 is flat. The hinge portion 10 is attached such that its longitudinal direction D1 aligns with the flat end of the first web 22. The first flange 21 is a flat portion that extends perpendicular to the flat shape of the first web 22. In other words, the first flange 21 extends in a direction perpendicular to the longitudinal direction D1 of the hinge portion 10.

[0045] In this embodiment, the first structural steel 20 is an H-shaped steel. Therefore, first flanges 21 are formed on both flat surfaces of the first web 22, but the first flanges 21 may be provided on only one side. Also, as shown in Figure 2, the first flange 21 includes a first mounting portion 41h for attaching a reinforcing plate 40, which is a splice plate, at the end of the first structural steel 20 in the longitudinal direction D1. As shown in Figure 2, the first mounting portion 41h is a plurality of bolt holes.

[0046] Member 30 is attached to the side of the hinge portion 10 that is aligned with the longitudinal direction D1, and is attached on the side opposite to the first structural steel 20, with the hinge portion 10 in between. Member 30 is a structure comprising a leg 30L and a second structural steel 30H. The leg 30L is the part of the structural steel system 100 that is connected to a pile driven into the seabed or land surface where it is to be installed. As shown in Figure 1, the legs 30L in member 30 are connected by a beam B.

[0047] The second structural steel section 30H is the part that connects to the first structural steel section 20. The second structural steel section 30H is common to the first structural steel section 20 in that it includes a second flange 31 and a second web 32. The second web 32 is flat. The hinge section 10 is attached so that its longitudinal direction D1 aligns with the end of the flat longitudinal direction D1 of the second web 32. The second flange 31 is a flat part that extends perpendicularly to the flat shape of the second web 32. In other words, the second flange 31 extends in a direction perpendicular to the longitudinal direction D1 of the hinge section 10. The second structural steel section 30H may be any of H-shaped steel, L-shaped steel, C-shaped steel, I-shaped steel, Z-shaped steel, channel steel, or T-shaped steel.

[0048] Furthermore, as shown in Figure 2, the cross-sections of the first structural steel 20 and the second structural steel 30H, which face each other via the hinge portion 10, are the same shape and size. In addition, the second structural steel 30H has a second mounting portion 42h for attaching the reinforcing plate 40 at the end of the portion facing the first structural steel 20. As shown in Figure 2, the second mounting portion 42h consists of multiple bolt holes. Furthermore, member 30 may not have a leg 30L, and may only have a second structural steel 30H. Alternatively, member 30 may have a second structural steel 30H and other structures.

[0049] The reinforcing plate 40 is a so-called splice plate in the structure. As shown in Figure 2, the reinforcing plate 40 connects the ends of the first structural steel 20 and the member 30 and is fixed with bolts or the like. For this reason, the reinforcing plate 40 has mounting sections 40h which are multiple bolt holes corresponding to the first mounting section 41h and the second mounting section 42h.

[0050] The fastening means 50 fastens to the first hinge portion 11 and the second hinge portion 12, which are tubular in the hinge portion 10, by being inserted into them. In this embodiment, the fastening means 50 is a bolt. The fastening means 50, which is a bolt, is fastened to a female threaded portion formed in the hinge portion 10, or to a nut located at the end of the hinge portion 10 opposite to the end into which the fastening means 50 is inserted. In this embodiment, as shown in Figure 10, the fastening means 50 is inserted into the hinge portion 10 from the side of the first hinge portion 11 and fastened to a female threaded portion (not shown) provided on the second hinge portion 12. When a female threaded portion is provided on the second hinge portion 12, the tubular shape of the hinge portion 10 is assumed to be cylindrical. If the tubular shape of the hinge portion 10 is not cylindrical, the fastening member shall be fastened to a separately provided nut.

[0051] As described above, the hinge portion 10 connects the first structural steel 20 and the member 30. The first structural steel 20 and the member 30 can rotate around the longitudinal direction D1 (axis of rotation) of the hinge portion 10 as the center of rotation. When the first structural steel 20 and the member 30 are rotated relative to each other around the hinge portion 10, the relative positions of the first structural steel 20 and the member 30 change. When the first structural steel 20 and the member 30 change from a first positional relationship to a second positional relationship through relative rotation, for example, the state in the first positional relationship is called the state before rotation, and the state in the second positional relationship is called the state after rotation. This rotation causes the structural steel system 100 to change between the states shown in Figures 1 and 2 and the states shown in Figures 3 and 4.

[0052] Specifically, before and after the rotation of the hinge portion 10, the first structural steel 20 and the member 30 overlap when viewed along the longitudinal direction D1, as shown in Figures 3 and 4. Specifically, the ends of the first flange 21 of the first structural steel 20 and the second flange 31 of the member 30 partially overlap. In this case, if the first structural steel 20 has first flanges 21 on both sides of the first web 22 (for example, in the case of an H-beam or I-beam), that is, if it has an upper flange and a lower flange, then the ends of both the upper flange and the lower flange will overlap. In this case, in the structural steel system 100 according to this embodiment, as shown in Figure 3, the beam B and the first structural steel 20 will be parallel. Also, when the first flange 21 and the second flange 31 overlap, the first web 22 and the second web 32 will be perpendicular. When the first web 22 and the second web 32 are perpendicular, as shown in Figure 4, the first web 22 and the second flange 31 will come into contact, so the first structural steel 20 will not rotate any further to move closer to the beam B. Furthermore, before and after the rotation, as shown in Figures 1 and 2, the first structural steel 20 and the member 30 do not overlap when viewed along the longitudinal direction D1.

[0053] In other words, the position D1 in the longitudinal direction of the first flange 21 and the position D1 in the longitudinal direction of the second flange 31 are different before and after the rotation of the hinge portion 10, but the same on the other side. Therefore, the position of the first mounting portion 41h corresponds to the position of the second mounting portion 42h when viewed along the longitudinal direction of the first structural steel 20.

[0054] In other words, as shown in Figures 3 and 4, when the first structural steel 20 and member 30 are folded by the hinge portion 10, the first structural steel 20 overlaps with member 30 when viewed along the longitudinal direction D1. Also, as shown in Figures 1 and 2, when the first structural steel 20 and member 30 are not folded by the hinge portion 10, the first structural steel 20 does not overlap with member 30 when viewed along the longitudinal direction D1.

[0055] Hereinafter, as shown in Figures 1 and 2, the state in which the first structural steel 20 and member 30 are not folded by the hinge portion 10 may be referred to as the unfolded state of the structural steel system 100. In contrast, as shown in Figures 3 and 4, the state in which the first structural steel 20 and member 30 are folded by the hinge portion 10 may be referred to as the stored state or folded state of the structural steel system 100.

[0056] As described above, the hinge portion 10 includes a first hinge portion 11 and a second hinge portion 12. As shown in Figure 5, the first hinge portion 11 is attached to the first structural steel 20. The second hinge portion 12 is attached to the member 30. Alternatively, the first hinge portion 11 may be attached to the member 30 and the second hinge portion 12 may be attached to the first structural steel 20. The above attachments may be made, for example, by adhesive or by welding. In this way, the first structural steel 20 and the member 30 are connected by fastening the first hinge portion 11 attached to the first structural steel 20 and the second hinge portion 12 attached to the member 30 using the fastening means 50.

[0057] With the above configuration, the hinge portion 10 rotatably connects the first structural steel 20 and the member 30. When the hinge portion 10 is tightened by the fastening means 50, it is possible to prevent the first structural steel 20 and the member 30 from rotating unintentionally. Conversely, when the tightening of the hinge portion 10 by the fastening means 50 is loosened, the first structural steel 20 and the member 30 can be rotated.

[0058] In this configuration, when the structural steel system 100 is unfolded, as shown in Figure 2, the first flange 21 of the first structural steel 20 and the second flange 31 of the member 30 are flush. Therefore, even if one attempts to fold the first structural steel 20 and the member 30 using the hinge portion 10, the first flange 21 and the second flange 31 will interfere with each other. Consequently, folding is not possible.

[0059] In contrast, as shown in Figure 6, the hinge portion 10 rotates with the axis of rotation of the hinge portion 10 as the center of rotation, and in response to the relative rotation between the first structural steel 20 and the member 30, it moves the first structural steel 20 along the longitudinal direction D1 by a distance corresponding to the thickness of the first flange 21. This avoids interference between the first flange 21 and the second flange 31 and enables folding of the first structural steel 20 and the member 30.

[0060] The following describes in detail the relative movement due to the structure of the hinge portion 10. As shown in Figure 7, the first hinge portion 11 has a first protrusion 11p at the end facing the second hinge portion 12. The second hinge portion 12 has a second protrusion 12p at the end facing the first hinge portion 11. The first hinge portion 11 and the second hinge portion 12 are outwardly identical in shape, but as shown in Figure 10, the second hinge portion 12 differs in that it has a female screw portion (not shown) for screwing into the male screw portion FB of the fastening means 50. If the fastening means 50 is fastened to a nut located at the end opposite to the end of the hinge portion 10 into which the fastening means 50, which is a bolt, is inserted, then the first hinge portion 11 and the second hinge portion 12 may be identical in shape.

[0061] The height D1 in the longitudinal direction of the first protrusion 11p, or the height D1 in the longitudinal direction of the second protrusion 12p, corresponds to the thickness of the first flange 21. Furthermore, the first protrusion 11p and the second protrusion 12p have corresponding shapes. As a result, the first hinge portion 11 and the second hinge portion 12 of the hinge portion 10 can be in the following two states.

[0062] Specifically, first, as shown in Figure 7, the tips of the first protrusion 11p and the second protrusion 12p are in contact with each other. Hereafter, this state will be referred to as the contact state. Alternatively, as shown in Figure 8, the sides of the first protrusion 11p and the second protrusion 12p are in contact with each other, and the first hinge portion 11 and the second hinge portion 12 are fitted together. Hereafter, this state will be referred to as the fitted state.

[0063] The change from a contact state to a fitted state, or from a fitted state to a contact state, is achieved by rotating the first hinge portion 11 and the second hinge portion 12 relative to each other in the axial direction. In other words, the first protrusion 11p contacts the second protrusion 12p before and after the rotation of the hinge portion 10. Also, the first hinge portion 11 and the second hinge portion 12 are fitted together before and after the rotation of the hinge portion 10.

[0064] As shown in Figure 9, the first protrusions 11p are provided at two locations in the circumferential direction of the tubular first hinge portion 11. Similarly, the second protrusions 12p are provided at two locations in the circumferential direction of the tubular second hinge portion 12. Therefore, in the fitted state, the first protrusions 11p and the second protrusions 12p interlock. Thus, in the fitted state, axial rotation of the first hinge portion 11 and the second hinge portion 12 is restricted. Therefore, when changing from a fitted state to a contact state, it is preferable to move the first hinge portion 11 and the second hinge portion 12 in the axial direction before rotating the first hinge portion 11 and the second hinge portion 12, for example by lifting the structural steel, in order to release the fitting between the first protrusion 11p and the second protrusion 12p.

[0065] Here, as described above, the height D1 in the longitudinal direction of the first protrusion 11p, or the height D1 in the longitudinal direction of the second protrusion 12p, corresponds to the thickness of the first flange 21. As a result, when the hinge portion 10 is changed from a contact state to a fitted state, the first hinge portion 11 and the second hinge portion 12 move relative to each other by the height of the first protrusion 11p or the second protrusion 12p. Specifically, the overall length of the hinge portion 10, which consists of the first hinge portion 11 and the second hinge portion 12, changes to a reduced length.

[0066] Therefore, as shown in Figure 2, if the hinge portion 10 is engaged when the structural steel system 100 is deployed, the first flange 21 and the second flange 31 can be made flush. Furthermore, as described above, when the hinge portion 10 is engaged, the axial rotation of the first hinge portion 11 and the second hinge portion 12 is restricted. In other words, the hinge portion 10 fixes the first structural steel 20 and the member 30 before and after the rotation of the hinge portion 10. Thus, by having the hinge portion 10 engaged when the structural steel system 100 is deployed, it is possible to prevent the first structural steel 20 and the member 30 from bending unintentionally.

[0067] In contrast, as shown in Figure 4, when the structural steel system 100 is in a retracted state, if the hinge portion 10 is brought into contact with the member 30, the first structural steel 20 can be moved relative to the member 30 by the height of the first protrusion 11p or the second protrusion 12p, i.e., the thickness of the first flange portion. Therefore, interference between the first flange 21 and the second flange 31 can be avoided, and the structural steel system 100 can be retracted.

[0068] Here, as described above, the change in state between the contact state and the fitted state is achieved by rotating the first hinge portion 11 and the second hinge portion 12 relative to each other in the axial direction. In other words, by rotating the first structural steel 20 and the member 30 with the hinge portion 10 as the axis of rotation, the state of the hinge portion 10 can be changed.

[0069] The first protrusion 11p and the second protrusion 12p shown in Figure 9 have inclined sides, but are not limited to this. For example, as shown in Figure 11, the sides of the first protrusion 11p and the second protrusion 12p may be parallel to the axial direction of the hinge portion 10. In this shape, the play between the first hinge portion 11 and the second hinge portion 12 in the fitted state can be reduced. Alternatively, as shown in Figure 12, in the circumferential direction of the tubular hinge portion 10, the sides of the first protrusion 11p and the second protrusion 12p may be inclined on one side and parallel to the axial direction on the opposite side. In this shape, play can be made only in the direction of folding and unfolding the first structural steel 20 and the member 30, and play on the opposite side can be reduced.

[0070] (Construction method for structural steel system 100) Next, a method for constructing the structural steel system 100 according to this embodiment will be described. The method for constructing the structural steel system 100 comprises a folding step and an unfolding step. The folding process is the process of folding the first structural steel 20 and the member 30 into a folded state by the hinge portion 10. In other words, in the folding process, as shown in Figures 3 and 4, the first flange 21 of the first structural steel 20 and the second flange 31 of the member 30 overlap when viewed along the longitudinal direction D1. In this state, the structural steel system 100 is transported to the construction site. For example, if the structural steel system 100 is an offshore structure, the structural steel system 100 is loaded onto the transport ship in the state shown in Figure 3. In the folded state, the positions of the first flange 21 and the second flange 31 in the longitudinal direction D1 are offset and overlapping, so the hinge portion 10 is in contact with the other flange. In order to maintain the folded state and safely transport the structural steel system 100, it is preferable to fix the hinge portion 10 in contact with the other flange by tightening the fastening means 50. Alternatively, the first structural steel 20 may be fixed by securing it with a rope or the like.

[0071] The unfolding process is the process of releasing the folded state of the first structural steel 20 and member 30. In other words, it is the process of unfolding the structural steel system 100, which was in the state shown in Figure 3 during the folding process, to the state shown in Figure 1. That is, in the unfolding process, the first flange 21 of the first structural steel 20 and the second flange 31 of member 30 do not overlap when viewed along the longitudinal direction D1. This process is carried out after the structural members 30 of the structural steel, which have been transported to the construction site, are fixed to the construction site. For example, if the structural steel system 100 is an offshore structure, this process is carried out after the members 30 are fixed to the seabed or the like via piles.

[0072] If the hinge portion 10 is fixed by the fastening means 50 during the folding process, this fastening is loosened. Next, the first structural steel 20 is rotated relative to the member 30 with the hinge portion 10 as the axis of rotation. This releases the overlap between the first flange 21 and the second flange 31, resulting in the state shown in Figure 6. After this, the first structural steel 20 is moved along the longitudinal direction D1 so that the first flange 21 and the second flange 31 become flush, as shown in Figure 2. At this time, the hinge portion 10 is in a fitted state. After this state is reached, the fastening means 50 is tightened to bring the first protrusion 11p and the second protrusion 12p into close contact and fix the hinge portion 10. After that, the first structural steel 20 and the member 30 are fixed together with the reinforcing plate 40, completing the construction of the structural steel system 100.

[0073] As described above, according to the structural steel system 100 of this embodiment, the hinge portion 10 rotates the first structural steel 20 along the longitudinal direction D1 by a distance corresponding to the thickness of the first flange 21 of the first structural steel 20, which extends in a direction perpendicular to the longitudinal direction D1, in response to the relative rotation between the first structural steel 20 and the member 30, which is a rotation centered on the rotation axis of the hinge portion 10. The first structural steel 20 and the member 30 overlap when viewed along the longitudinal direction D1 before and after the rotation, but do not overlap when viewed along the longitudinal direction D1 on the other side.

[0074] Before and after the rotation, the first structural steel 20 and the member 30 overlap, thereby reducing the overall size of the structural steel. On the other side before and after the rotation, the first structural steel 20 and the member 30 do not overlap. In addition, the hinge portion 10 moves the first structural steel 20 by a distance corresponding to the thickness of the first flange 21 in the longitudinal direction D1 of the hinge portion 10. This allows adjustment of the position of the hinge portion 10 in the longitudinal direction D1 between the first structural steel 20 and the member 30 on the other side before and after the rotation.

[0075] Therefore, with respect to the structural steel according to the present invention, the first structural steel 20 and the member 30 are transported in a state where they are pre-joined by the hinge portion 10, and the shape of the structural steel can be changed by rotating the hinge portion 10 during construction. Thus, compared to the case where the first structural steel 20 and the member 30 are joined at the construction site, work efficiency can be improved. Structural steel having such effects can be used particularly suitably when constructing offshore structures in places where complex work is difficult, such as at sea.

[0076] Furthermore, the position of the first flange 21 of the hinge portion 10 in the longitudinal direction D1 and the position of the flange of the member 30 are different on one hand, and the same on the other hand. The difference in the positions of the first flange 21 of the first structural steel 20 and the flange of the member 30 before and after the rotation of the hinge portion 10 allows the first flange 21 and the flange to overlap. By making the positions of the first flange 21 and the flange of the hinge portion 10 in the longitudinal direction D1 the same on the other hand before and after the rotation of the hinge portion 10, the step difference between the first flange 21 and the flange can be eliminated. Therefore, the integrity between the first structural steel 20 and the member 30 can be improved on the other hand before and after the rotation of the hinge portion 10.

[0077] Furthermore, the hinge portion 10 also fixes the first structural steel 20 and the member 30 on the other side. In other words, it is possible to prevent the hinge portion 10 from unintentionally rotating in the opposite direction and returning to one of the states before and after the rotation of the hinge portion 10. Therefore, the workability of constructing the structural steel can be improved.

[0078] Furthermore, the first hinge portion 11 and the second hinge portion 12, which are included in the hinge portion 10, are fitted together on the other side. In other words, the rotation of the hinge portion 10 is suppressed by the fitting of the first hinge portion 11 and the second hinge portion 12 on the other side. Therefore, it is possible to prevent the hinge portion 10 from rotating excessively or in the reverse direction without having to fix the first hinge portion 11 and the second hinge portion 12 together by adhesive or welding before and after the rotation of the hinge portion 10. This further improves the workability of the structural steel.

[0079] Furthermore, in the longitudinal direction D1 of the hinge portion 10, the height of the first protrusion 11p provided on the first hinge portion 11, or the height of the second protrusion 12p provided on the second hinge portion 12, corresponds to a distance corresponding to the thickness of the first flange 21. In other words, when moving the first structural steel 20 by a distance corresponding to the thickness of the first flange 21 in the longitudinal direction D1 of the hinge portion 10, the height of the first protrusion 11p or the height of the second protrusion 12p can be used as a guide.

[0080] Furthermore, the first protrusion 11p abuts against the second protrusion 12p on one side. Here, as described above, the height of the first protrusion 11p or the second protrusion 12p corresponds to the thickness of the first flange 21. Therefore, by the abutment of the first protrusion 11p and the second protrusion 12p, the positions of the first structural steel 20 and the member 30 can be moved in the longitudinal direction D1 of the hinge portion 10 by the thickness of the first flange 21. Thus, the position of the first flange 21 and the flange can be easily adjusted. Therefore, the workability of construction can be further improved.

[0081] Furthermore, the hinge portion 10 is tubular, and the fastening means 50 is inserted into the hinge portion 10, thereby fastening the first hinge portion 11 and the second hinge portion 12 together. This allows the first hinge portion 11 and the second hinge portion 12 to engage on the other side, preventing the hinge portion 10 from rotating in the opposite direction, and also allows the hinge portion 10 to be fixed by the fastening means 50. If it is necessary to intentionally rotate the hinge portion 10 in the opposite direction, the fastening means 50 can be released from fixing the hinge portion 10. Therefore, the fixing of the structural steel on the other side can be made more secure.

[0082] Furthermore, the fastening means 50 is a bolt, which is fastened to a female threaded portion formed on the hinge portion 10, or to a nut located on the end of the hinge portion 10 opposite to the end into which the bolt is inserted. This allows the hinge portion 10 to rotate by loosening the bolt on the hinge portion 10 before or after its rotation. The hinge portion 10 can be fixed by tightening the bolt on the other side of the hinge portion 10's rotation. In this way, the structural steel can be fixed by bolt fastening. Therefore, the work of fixing the structural steel can be easily performed.

[0083] Furthermore, the first structural steel 20, member 30, hinge portion 10, and fastening means 50 function as load-transmitting strength members. In other words, the structural steel can be used as a load-transmitting strength member. Therefore, structural steel with high workability as described above can be provided to sites that require strength members. For example, it can be used particularly suitably when constructing offshore structures in places where complex work is difficult, such as at sea.

[0084] Furthermore, the first structural steel 20 and the member 30 each include a first mounting portion 41h and a second mounting portion 42h for attaching a reinforcing plate 40, which is a splice plate. This allows for greater strength of the structural steel by attaching the reinforcing plate 40 to the structural steel both before and after the rotation of the hinge portion 10.

[0085] Furthermore, the position of the first mounting portion 41h corresponds to the position of the second mounting portion 42h when viewed along the longitudinal direction D1 of the first structural steel 20. Therefore, it is possible to easily reinforce the first structural steel 20 and the member 30 by attaching the reinforcing plate 40 on the other side.

[0086] Furthermore, when the first structural steel 20 and member 30 are folded by the hinge portion 10, the first structural steel 20 overlaps with member 30 when viewed along the longitudinal direction D1, and when the first structural steel 20 and member 30 are not folded by the hinge portion 10, the first structural steel 20 does not overlap with member 30 when viewed along the longitudinal direction D1. When the first structural steel 20 and the member 30 are folded by the hinge portion 10, the first structural steel 20 and the member 30 overlap, which makes it possible to reduce the overall size of the structural steel. When the first structural steel 20 and the member 30 are not folded by the hinge portion 10, the first structural steel 20 and the member 30 do not overlap, which allows the overall size of the structural steel to be increased.

[0087] Therefore, the first structural steel 20 and the member 30 can be folded by the hinge portion 10, reducing their overall size during transport, and the first structural steel 20 and the member 30 can be left unfolded by the hinge portion 10 during construction. Thus, the transportation and construction of the structural steel can be carried out easily and efficiently. Structural steel having such effects can be used particularly suitably when constructing offshore structures in places where complex work is difficult, such as at sea.

[0088] Furthermore, the first structural steel 20 can be any of the following: H-beam, L-beam, C-beam, I-beam, Z-beam, channel steel, or T-beam. In other words, the first structural steel 20 can be made from a general-purpose structural steel. Therefore, the first structural steel 20 can be formed without using special materials.

[0089] Furthermore, member 30 is a structure. In other words, the structural steel according to the present invention can be used as part of a structure. Therefore, construction work on the structure can be carried out efficiently.

[0090] Furthermore, the second structural steel 30H is one of the following: H-beam, L-beam, C-beam, I-beam, Z-beam, channel steel, or T-beam. In other words, member 30 can be made from a general-purpose structural steel. Therefore, member 30 can be formed without using special materials.

[0091] Furthermore, the structural steel system 100 can be easily constructed.

[0092] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the cross-sections of the connection between the first structural steel 20 and the member 30 do not have to be the same. For instance, the first structural steel 20 may be an H-shaped steel while the member 30 has a cross-sectional shape of another type of steel. Furthermore, the structural steel system 100 may be used not only in marine structures like those in this embodiment, but also in general buildings.

[0093] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of Symbols]

[0094] 10. Hinge section 11. First hinge section 11p First protrusion 12. Second hinge section 12p Second protrusion 20 Section 1 21 First flange 30 components 40 Reinforcement Plates 41h First mounting section 42h Second mounting section 50 Fastening means 100-shaped steel system D1 Longitudinal direction

Claims

1. The hinge part, A first structural steel for offshore structures, which is attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion, A structural steel system for an offshore structure comprising: a member attached to the side of the hinge portion that is aligned with the longitudinal direction, and attached on the opposite side from the first structural steel with respect to the hinge portion; The hinge portion rotates with the axis of rotation of the hinge portion as the center of rotation, and in response to the relative rotation between the first structural steel and the member, the first structural steel moves along the longitudinal direction by a distance corresponding to the thickness of the first flange of the first structural steel that extends in a direction perpendicular to the longitudinal direction. The first structural steel and the member overlap when viewed along the longitudinal direction before and after the rotation, but do not overlap when viewed along the longitudinal direction on the other side. The rotation axis of the hinge portion is positioned between the first structural steel and the member in the other case. A structural steel system for offshore structures, characterized in that the hinge portion is sandwiched between the first structural steel and the member on the other side.

2. The longitudinal position of the first flange and the longitudinal position of the flange of the member that extends in a direction perpendicular to the longitudinal direction are different on the one hand, and the same on the other hand. The structural steel system according to feature 1.

3. The steel shaping system according to claim 1 or 2, characterized in that the hinge portion fixes the first steel shaping and the member on the other side.

4. The aforementioned hinge portion includes a first hinge portion and a second hinge portion. The structural steel system according to any one of claims 1 to 3, characterized in that the first hinge portion and the second hinge portion are fitted together on the other side.

5. The first hinge portion has a first protrusion at the end facing the second hinge portion, The second hinge portion has a second protrusion at the end facing the first hinge portion. The longitudinal height of the first protrusion, or the longitudinal height of the second protrusion, corresponds to the distance. The structural steel system according to feature 4.

6. The structural steel system according to claim 5, characterized in that the first protrusion abuts against the second protrusion on one side.

7. Further equipped with fastening means, The aforementioned hinge portion is rod-shaped and hollow, The fastening means fastens the first hinge portion and the second hinge portion by being inserted into the hinge portion. The structural steel system according to any one of claims 4 to 6.

8. The fastening means is a bolt, and the bolt is fastened to a female threaded portion formed in the hinge portion, or to a nut located at the end of the hinge portion opposite to the end into which the bolt is inserted. The structural steel system according to feature 7.

9. The first structural steel, the member, the hinge portion, and the fastening means function as load-transmitting strength members. The structural steel system according to feature 7 or 8.

10. The hinge part, A first structural steel for offshore structures, which is attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion, A structural steel system for an offshore structure comprising: a member attached to the side of the hinge portion that is aligned with the longitudinal direction, and attached on the opposite side from the first structural steel with respect to the hinge portion; The hinge portion rotates with the axis of rotation of the hinge portion as the center of rotation, and in response to the relative rotation between the first structural steel and the member, the first structural steel moves along the longitudinal direction by a distance corresponding to the thickness of the first flange of the first structural steel that extends in a direction perpendicular to the longitudinal direction. The first structural steel and the member overlap when viewed along the longitudinal direction before and after the rotation, but do not overlap when viewed along the longitudinal direction on the other side. The first structural steel includes a first mounting portion for attaching a reinforcing plate which is a splice plate, A structural steel system for offshore structures, characterized in that the member includes a second mounting portion for attaching the reinforcing plate.

11. The position of the first mounting portion corresponds to the position of the second mounting portion when viewed along the longitudinal direction of the first structural steel, The structural steel system according to feature 10.

12. The hinge part, A first structural steel for offshore structures, which is attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion, A structural steel system for an offshore structure comprising: a member attached to the side of the hinge portion that is aligned with the longitudinal direction, and attached on the opposite side from the first structural steel with respect to the hinge portion; When the first structural steel and the member are folded by the hinge portion, the first structural steel overlaps with the member when viewed along the longitudinal direction, and when the first structural steel and the member are not folded by the hinge portion, the first structural steel does not overlap with the member when viewed along the longitudinal direction. The first structural steel includes a first mounting portion for attaching a reinforcing plate which is a splice plate, The member includes a second mounting portion for attaching the reinforcing plate, A structural steel system for offshore structures characterized by the following features.

13. The aforementioned first-shaped steel is one of the following: H-shaped steel, L-shaped steel, C-shaped steel, I-shaped steel, Z-shaped steel, channel steel, or T-shaped steel. A structural steel system according to any one of claims 1 to 12.

14. The aforementioned member is a structure. A structural steel system according to any one of claims 1 to 13.

15. The aforementioned member is a second-shaped steel, The aforementioned second-shaped steel is one of the following: H-shaped steel, L-shaped steel, C-shaped steel, I-shaped steel, Z-shaped steel, channel steel, or T-shaped steel. A structural steel system according to any one of claims 1 to 13.

16. A hinge portion and A first structural steel for offshore structures, which is attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion, A structural steel system for an offshore structure comprising: a member attached to the side of the hinge portion that is aligned with the longitudinal direction, and attached on the opposite side from the first structural steel with respect to the hinge portion; The hinge portion rotates with the axis of rotation of the hinge portion as the center of rotation, and in response to the relative rotation between the first structural steel and the member, the first structural steel moves along the longitudinal direction by a distance corresponding to the thickness of the upper and lower flanges, which are the first flanges of the first structural steel and extend in a direction perpendicular to the longitudinal direction. The distance between the upper flange and the lower flange of the first structural steel and the member is approximately equal. The first structural steel and the member overlap when viewed along the longitudinal direction before and after the rotation, but do not overlap when viewed along the longitudinal direction on the other side. On the other hand, the structural steel system for offshore structures is characterized in that, when viewed along the longitudinal direction, the position of the upper flange of the first structural steel coincides with the position of the upper flange of the member, and the position of the lower flange of the first structural steel coincides with the position of the lower flange of the member.

17. The hinge part, A first structural steel for offshore structures, which is attached to the side surface of the hinge portion that is aligned with the longitudinal direction of the hinge portion, A method for constructing a structural steel system for an offshore structure, comprising: a member attached to the side of the hinge portion that is aligned with the longitudinal direction, and attached to the side opposite to the first structural steel with respect to the hinge portion; A folding step in which the first structural steel and the member are folded by the hinge portion, The process includes a release step for releasing the folded state of the first structural steel and the member, In the folding process, the first structural steel and the member overlap when viewed along the longitudinal direction. In the release step, the first structural steel and the member do not overlap when viewed along the longitudinal direction. The first structural steel and the member are transported by sea in a folded state. A method for constructing a structural steel system for an offshore structure, characterized in that the aforementioned release step is performed at sea.

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