Structures and methods for constructing structures

Abstract

The present invention provides a structure in which an erection piece is extended from a first metal structural member to a second metal structural member, and the erection piece can also be used as a suspension device. [Solution] The structure 1 comprises a first metal structural member 10A, a second metal structural member 10B, and an erection piece 20 formed in a plate shape and having a first insertion hole 23 through which a crane lifting device is inserted, and extending from the first metal structural member to the second metal structural member. Of the erection piece, one side Z1 in the longitudinal direction Z of the erection piece is welded to the first metal structural member, and the other side Z2 of the erection piece is welded to the second metal structural member.

Description

Technical Field

[0001] The present disclosure relates to a structure and a method for constructing the structure.

Background Art

[0002] Conventionally, erection pieces have been used. Patent Document 1 discloses that insertion holes for inserting a crane sling are formed in the erection pieces of the upper steel column (second metal structure member) and the erection pieces of the lower steel column (first metal structure member).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the method for constructing the structure of Patent Document 1, an erection piece straddling the upper steel column and the lower steel column was not assumed.

[0005] The present disclosure has been made in view of such problems, and an object thereof is to provide a structure capable of passing an erection piece from a first metal structure member to a second metal structure member and also using the erection piece as a sling, and a method for constructing the structure.

Means for Solving the Problems

[0006] This disclosure relates to a structure comprising a first metal structural member, a second metal structural member, and an erection piece formed in a plate shape and having a first insertion hole through which a crane lifting device is inserted, and extending from the first metal structural member to the second metal structural member, wherein one side of the erection piece in the longitudinal direction is welded to the first metal structural member, and the other side of the erection piece is welded to the second metal structural member.

[0007] Other disclosures relating to the present invention include a method for constructing the structure described above, comprising: a first welding step of welding one side portion to the first metal structural member; a lifting step of lifting the erection piece with a crane using the first insertion hole; and a second welding step of welding the other side portion to the second metal structural member after the lifting step. [Effects of the Invention]

[0008] In the structure and construction method of the structure disclosed herein, the erection piece is passed from the first metal structural member to the second metal structural member, and the erection piece can also be used as a suspension device. [Brief explanation of the drawing]

[0009] [Figure 1] This is a side view of the structure of the first embodiment of the present disclosure. [Figure 2] This diagram illustrates the structure being lifted by a crane. [Figure 3] This is a flowchart showing a method for constructing a structure according to the first embodiment of this disclosure. [Figure 4] This is a perspective view of a key part of a structure according to a second embodiment of the present disclosure. [Figure 5] This is a side view of the main part of the structure. [Figure 6] This is a perspective view of a structure according to a third embodiment of this disclosure. [Figure 7]This is a cross-sectional view of the main part of the structure. [Figure 8] This is a perspective view of the structure of the fourth embodiment of this disclosure. [Modes for carrying out the invention]

[0010] (First Embodiment) The first embodiment of the structure and construction method of the structure relating to this disclosure will be described below with reference to Figures 1 to 3. As shown in Figure 1, the structure 1 of this embodiment comprises a first structural steel (first metal structural member, structural steel) 10A, a second structural steel (second metal structural member, structural steel) 10B, and an erection piece 20. In Figure 1, the second structural steel 10B is shown by a dashed line, and in Figures 1 and below, the welded joints 15 and 51, which will be described later, are hatched.

[0011] In this embodiment, the configuration of the first structural steel 10A and the configuration of the second structural steel 10B are identical. Therefore, the configuration of the first structural steel 10A is indicated by adding the capital letter "A" to the numeral in its designation. The configuration of the second structural steel 10B that corresponds to the first structural steel 10A is indicated by adding the capital letter "B" to the same numeral as the designation of the first structural steel 10A. This eliminates the need for redundant explanations. For example, the first flange 11A of the first structural steel 10A, described later, and the first flange 11B of the second structural steel 10B have the same configuration.

[0012] Here, the first structural steel 10A, the second structural steel 10B, and the erection piece 20 are formed in a shape that extends in their respective longitudinal directions, and their respective longitudinal directions coincide with each other. In the following, the longitudinal directions of the first structural steel 10A, the second structural steel 10B, and the erection piece 20 that coincide with each other will be referred to as the longitudinal direction Z.

[0013] The first structural steel 10A is an H-shaped steel formed from steel plates. The first structural steel 10A has a first flange 11A, a second flange 12A, and a web 13A. The first flange 11A, the second flange 12A, and the web 13A are each formed in a flat plate shape. The first flange 11A is disposed above the second flange 12A. The first flange 11A and the second flange 12A face each other in the vertical direction. The web 13A is disposed between the first flange 11A and the second flange 12A. The web 13A is joined to the middle part in the width direction of the first flange 11A and the middle part in the width direction of the second flange 12A, respectively. Note that the first section steel is not limited to H-shaped steel, and may be a box girder or the like.

[0014] The longitudinal direction Z of the first section steel 10A is along the horizontal plane. Here, that A is along (extends along) B means that the angle formed by A and B is 30° or less. This formed angle may be 15° or less. Note that the first section steel 10A may be rolled H-shaped steel or welded fabricated H-shaped steel. The second section steel 10B has a first flange 11B, a second flange 12B, and a web 13B configured in the same manner as the first flange 11A, the second flange 12A, and the web 13A of the first section steel 10A. Note that the second section steel is not limited to H-shaped steel, and may be a box girder or the like.

[0015] The first section steel 10A and the second section steel 10B are abutted (arranged side by side) in the longitudinal direction Z. As described above, the first section steel 10A and the second section steel 10B include section steel. Note that the cross-sectional shape orthogonal to the longitudinal direction Z of the second section steel 10B may be different from the cross-sectional shape orthogonal to the longitudinal direction Z of the first section steel 10A.

[0016] The erection piece 20 is a plate for temporary attachment. The erection piece 20 is formed in a flat plate shape (plate shape). In this example, it is integrally formed of a steel plate. The erection piece 20 is a single plate-like member. The thickness direction X of the erection piece 20 is aligned with the horizontal plane. The thickness direction X is perpendicular to the longitudinal direction Z. Here, we define a short direction Y that is perpendicular to both the thickness direction X and the longitudinal direction Z. In this embodiment, the length of the longitudinal direction Z of the erection piece 20 is longer than the length of the short direction Y of the erection piece 20. When viewed along the thickness direction X, the erection piece 20 has a rectangular shape that is longer in the longitudinal direction Z. Furthermore, the length of the erection piece 20 in the short direction Y may be longer than the length of the erection piece 20 in the long direction Z.

[0017] In this example, notches 21 and 22 are formed in the middle of the longitudinal direction Z on the upper surface of the erection piece 20 and in the middle of the longitudinal direction Z on the lower surface of the erection piece 20, respectively. When viewed along the thickness direction X, the notches 21 and 22 have a semicircular shape. Furthermore, the shape of the notch when viewed along the thickness direction X is not limited to a semicircular shape, but may be rectangular, trapezoidal, or the like. At least one of the notches 21 and 22 does not need to be formed in the erection piece 20.

[0018] The erection piece 20 has a first insertion hole 23 formed therein. The first insertion hole 23 is provided on one side Z1 (hereinafter simply referred to as one side Z1) of the erection piece 20 in the longitudinal direction Z. Hereafter, the side of the longitudinal direction Z opposite to one side Z1 will be referred to as the other side Z2 (hereinafter simply referred to as the other side Z2). In this example, the first insertion hole 23 has a circular shape when viewed along the thickness direction X. The first insertion hole 23 penetrates the erection piece 20 in the thickness direction X. Furthermore, the shape of the first through-hole 23 when viewed along the thickness direction X is not limited to a circular shape.

[0019] One side Z1 portion of the erection piece 20 is welded to the first flange 11A of the first structural steel 10A. The one side Z1 portion of the erection piece 20 and the first flange 11A are connected to each other by a weld 15. The other side Z2 portion of the erection piece 20 is welded to the first flange 11B of the second structural steel 10B. In other words, the other side Z2 portion of the erection piece 20 will either be welded to the second structural steel 10B in the future or has already been welded to the second structural steel 10B.

[0020] As shown in Figure 2, the structure 1 (first structural steel 10A) is preferably provided with two erection pieces 20, and the two erection pieces 20 are welded to both ends of the first structural steel 10A in the longitudinal direction Z. A lifting device 200 of the crane 201 is inserted through the first insertion hole 23 of each erection piece 20. The lifting device 200 is lifted by the crane 201. As shown in Figure 1, the erection piece 20 extends from the first structural steel 10A to the second structural steel 10B in the longitudinal direction Z. In other words, the erection piece 20 extends from at least a portion of the first structural steel 10A to at least a portion of the second structural steel 10B in the longitudinal direction Z.

[0021] Next, we will explain the construction method (hereinafter simply referred to as the construction method) for constructing structure 1, which is configured as described above. Figure 3 is a flowchart of construction method S1. First, in the first welding step (step S10 shown in Figure 3), one side Z1 of the two erection pieces 20 is welded to both ends of the first structural steel 10A using a welding machine (not shown). Once the first welding step S10 is completed, the process proceeds to step S11.

[0022] Next, in the lifting step S11, the erection pieces 20 are lifted by the crane 201 using the first insertion holes 23 of the two erection pieces 20 welded to the first structural steel 10A. Once the lifting step S11 is completed, the process moves on to step S12. Next, in the pulling step S12, for example, a wire (not shown) is inserted through the first insertion hole 23 of the erection piece 20 to pull the first structural steel 10A in the longitudinal direction Z and the thickness direction X. The first structural steel 10A is then moved to a position where it abuts against the second structural steel 10B in the longitudinal direction Z. Once the pulling step S12 is completed, the process moves to step S13.

[0023] Next, in the second welding step S13, the other side Z2 portion of the erection piece 20 is welded to the second structural steel 10B. The second welding step S13 is performed after the lifting step S11 and after the pulling step S12.

[0024] By performing the above steps, structure 1 is constructed. Next, the first structural steel 10A and the second structural steel 10B are connected to each other by welding or other means. The erection piece 20 is removed from the first structural steel 10A and the second structural steel 10B. In this way, the first structural steel 10A and the second structural steel 10B are connected to each other with the erection piece 20 removed.

[0025] Note that in construction method S1, the attraction step S12 does not need to be performed.

[0026] As described above, in the structure 1 of this embodiment, the erection piece 20 can be passed from the first structural steel 10A to the second structural steel 10B. By inserting the lifting device 200 of the crane 201 through the first insertion hole 23 of the erection piece 20, the first structural steel 10A can be easily lifted via the erection piece 20, and the erection piece 20 can also be used as another lifting device.

[0027] The first through-hole 23 is provided on one side Z1 of the erection piece 20. For example, when the erection piece 20 is lifted by inserting the lifting device 200 through the first through-hole 23 of the erection piece 20, the distance between the welded portion of the first structural steel 10A and the erection piece 20 and the first through-hole 23 is shorter compared to the case where the first through-hole 23 is provided on the other side Z2 of the erection piece 20, thus reducing the stress acting on the welded portion. The first structural steel 10A and the second structural steel 10B include structural steel. Therefore, the first structural steel 10A and the second structural steel 10B can be constructed using structural steel, a commonly used component, while keeping manufacturing costs down.

[0028] Furthermore, in the construction method S1 of this embodiment, in the first welding step S10, one side Z1 of the erection piece 20 is welded to the first structural steel 10A, and in the lifting step S11, the erection piece 20 is lifted by the crane 201 using the first insertion hole 23. Then, in the second welding step S13, the other side Z2 of the erection piece 20 is welded to the second structural steel 10B, thereby connecting the first structural steel 10A and the second structural steel 10B via the erection piece 20.

[0029] The structure 1 of this embodiment can be modified in various ways, as described below. As shown in Figure 1, in the structure 1 of this embodiment, a second insertion hole 24 may be provided in the other side Z2 portion of the erection piece 20. With this configuration, for example, if two erection pieces 20 are welded to the structure 1 after the erection piece 20 has been welded to the second structural steel 10B, the structure 1 can be suspended in a more stable state compared to when the structure 1 is suspended by two lifting devices 200, by inserting three lifting devices 200 into three of the first insertion holes 23 and second insertion holes 24 provided in each of the two erection pieces 20.

[0030] In the structure 1 of this embodiment, the first insertion hole 23 may be provided on the other side Z2 portion of the erection piece 20. By configuring it in this way, when lifting a structure 1 by inserting a lifting device 200 through the first insertion hole 23, the maneuverability of the structure 1 can be improved when pulling the structure 1 to move it by inserting a wire or the like through the first insertion hole 23. This configuration is more suitable when the structure 1 is relatively light.

[0031] The length in the longitudinal direction Z of one side Z1 of the erection piece 20 may be longer than the length in the longitudinal direction Z of the other side Z2 of the erection piece 20. By configuring it in this way, the length of one side Z1 of the erection piece 20 that is welded to the first structural steel 10A becomes longer, so that one side Z1 of the erection piece 20 can withstand greater stress.

[0032] (Second Embodiment) Next, a second embodiment of this disclosure will be described with reference to Figures 4 and 5. The same reference numerals are used for parts identical to those in the previous embodiment, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 4, the structure 2 in this embodiment is an offshore structure, and more specifically, a jacket-type structure. For example, structure 2 supports the lower end of the tower in an offshore wind turbine, which is an offshore structure. Note that in Figure 4, only one brace 30, which will be described later, is shown with a dashed line, and only one leg 35 is shown. Furthermore, the structure may be a river structure such as a bridge or bridge pier. As shown in Figures 4 and 5, the structure 2 comprises a plurality of braces (first metal structural members, steel pipes) 30, a plurality of legs (second metal structural members, steel pipes) 35, and a plurality of erection pieces 20.

[0033] As shown in Figure 4, each leg 35 has a leg body 36 and a leg connecting portion 37. The leg body 36 and the leg connecting portion 37 are each formed from steel pipes. The leg body 36 extends vertically. For example, the lower end of the leg body 36 is connected to a pile driven into the seabed. The upper end of the leg body 36 is connected to a tower. The leg connection portion 37 extends from the leg body 36 in a direction that intersects the leg body 36. Each brace 30 is formed from a steel pipe. The brace 30 is a component that connects the legs 35 together.

[0034] As shown in Figure 5, the diameter (outer diameter) of the leg connection portion 37 of the leg 35 is larger than the diameter of the brace 30. The leg connection portion 37 of the leg 35 and the brace 30 are abutted together in the longitudinal direction Z. In this example, the leg connection portion 37 and the brace 30 are arranged coaxially on axis O1. As described above, the brace 30 and leg 35 include steel pipes.

[0035] In this embodiment, except for the portion where the notch 21 is formed, the position of the end of the erection piece 20 opposite to the brace 30 and leg connection portion 37 in the short direction Y (radially outward from the brace 30 and leg connection portion 37) is constant regardless of the position in the longitudinal direction Z. The width L1 along the short direction Y of the other side Z2 portion of the erection piece 20 is shorter than the width L2 along the short direction Y of the one side Z1 portion of the erection piece 20. In other words, the distance between the other side Z2 portion of the erection piece 20 and the axis O1 is longer than the distance between the one side Z1 portion of the erection piece 20 and the axis O1. That is, the position of the end of the erection piece 20 on the axis O1 side is stepped depending on the position in the longitudinal direction Z of the erection piece 20.

[0036] One side Z1 of the erection piece 20 is welded to the brace 30. The other side Z2 of the erection piece 20 is welded to the leg connection 37. The brace 30 and the leg connection portion 37 are connected to each other by welding or the like.

[0037] As described above, in the structure 2 of this embodiment, the erection piece 20 is extended from the brace 30 to the leg 35, and the erection piece 20 can also be used as a suspension device. Furthermore, structure 2 is an offshore structure. For this reason, structure 2, which has increased connection strength between the brace 30 and the leg 35 via the erection piece 20, can be used for offshore applications.

[0038] Structure 2 is a jacket-type structure, with the first metal structural member being a brace 30 and the second metal structural member being a leg 35. This allows for increased connection strength between the brace 30 and the leg 35 via the erection piece 20 in a jacket-type structure equipped with the brace 30 and the leg 35. By inserting the lifting device 200 through the first insertion hole 23 of the erection piece 20, the brace 30 can be easily lifted via the erection piece 20. This allows for secure connection of the brace 30 to the leg 35.

[0039] In the erection piece 20, the width L1 is shorter than the width L2. Therefore, for example, even if the diameter of the leg connection portion 37 of the leg 35, which is a second metal structural member welded to the other side Z2 of the erection piece 20, is larger than the diameter of the brace 30, which is a first metal structural member welded to the one side Z1 of the erection piece 20, these leg connection portion 37 and the brace 30 can be connected coaxially to each other. The brace 30 and leg 35 include steel pipes. Therefore, the brace 30 and leg 35 can be constructed using steel pipes, a commonly used material, while keeping manufacturing costs down.

[0040] In addition, in the erection piece 20, the width L1 may be greater than or equal to the width L2. Both the first metal structural member and the second metal structural member may be legs or the like.

[0041] (Third embodiment) Next, a third embodiment of this disclosure will be described with reference to Figures 6 and 7. The same reference numerals are used for parts identical to those in the previous embodiments, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 6, structure 3 in this embodiment is an offshore structure, and more specifically, a monopile structure. A monopile structure, as used here, refers to a type of structure in which a single large-diameter pile is driven into the seabed or similar ground to support a wind turbine. Structure 3 comprises a first pipe (first metal structural member, steel pipe, pipe) 40, a second pipe (second metal structural member, steel pipe) 45, ... and a plurality of erection pieces 20 (not shown). Each of the first pipe 40, the second pipe 45, ... constitutes a monopile structure.

[0042] As shown in Figure 7, the first pipe 40 has a first bent steel plate (first metal structural member) 41, a second bent steel plate (second metal structural member) 42, ... and a plurality of erection pieces 20. Each of the first bent steel plate 41, the second bent steel plate 42, ... constitutes the first pipe 40 of the monopile structure. The first bent steel plate 41, the second bent steel plate 42, etc., are formed in an arc shape by the steel plates when viewed in the direction of the axis O3 of the first pipe 40. The first bent steel plate 41 and the second bent steel plate 42 are butted together in the longitudinal direction Z. The short-side direction Y of the erection piece 20 is approximately aligned with the normal direction W1 of the first bent steel plate 41 and the second bent steel plate 42, respectively (including the meaning of being approximately aligned). In other words, the short-side direction Y of the erection piece 20 is approximately aligned with the normal direction W1 of the portion of the first bent steel plate 41 and the second bent steel plate 42 to which the erection piece 20 is welded.

[0043] One side Z1 of the erection piece 20 is welded to the first bent steel plate 41. The other side Z2 of the erection piece 20 is welded to the second bent steel plate 42. The first bent steel plate 41 and the second bent steel plate 42 are connected to each other by welding. In this case, the ends of the erection piece 20 on the side of the first bent steel plate 41 and the second bent steel plate 42 may be curved to correspond to the first bent steel plate 41 and the second bent steel plate 42.

[0044] As shown in Figure 6, the first pipe 40 and the second pipe 45 are butted together in the longitudinal direction Z. One side Z1 portion of the erection piece 20 is welded to the first pipe 40. The other side Z2 portion of the erection piece 20 is welded to the second pipe 45. The first pipe 40 and the second pipe 45 are connected to each other by welding or the like.

[0045] As described above, in the structure 3 of this embodiment, the erection piece 20 is extended from the first pipe 40 to the second pipe 45, and the erection piece 20 can also be used as a suspension device. Structure 3 is a monopile structure, the first metal structural member is the first pipe 40, and the second metal structural member is the second pipe 45. Therefore, for a monopile structure comprising the first pipe 40 and the second pipe 45, the connection strength between the first pipe 40 and the second pipe 45 via the erection piece 20 can be increased.

[0046] Structure 3 is a monopile structure, the first metal structural member is a first bent steel plate 41, and the second metal structural member is a second bent steel plate 42. This makes it possible to increase the connection strength between the first bent steel plate 41 and the second bent steel plate 42 via the erection piece 20 to the monopile structure which comprises the first bent steel plate 41 and the second bent steel plate 42 that constitute the first pipe 40. Furthermore, by inserting the lifting device 200 through the first insertion hole 23 of the erection piece 20, the first bent steel plate 41 can be easily lifted via the erection piece 20. This allows for a secure connection between the first bent steel plate 41 and the second bent steel plate 42.

[0047] The short-side direction Y of the erection piece 20 is approximately aligned with the normal direction W1 of the first bent steel plate 41 and the second bent steel plate 42, respectively. Therefore, the erection piece 20 can be reliably passed from the first bent steel plate 41 to the second bent steel plate 42. Furthermore, by fixing the position of the erection piece 20 relative to the first bent steel plate 41 and the second bent steel plate 42, displacement of the erection piece 20 relative to the first bent steel plate 41 and the second bent steel plate 42 during welding can be prevented.

[0048] The first pipe 40 may be integrally constructed from a steel pipe. The same applies to the second pipes 45, etc., as to the first pipe 40. The short-side direction Y of the erection piece 20 does not have to be aligned with the normal direction W1 of the first bent steel plate 41 and the second bent steel plate 42, respectively.

[0049] (Fourth Embodiment) Next, a fourth embodiment of this disclosure will be described with reference to Figure 8. The same reference numerals are used for parts identical to those in the previous embodiments, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 8, the structure 4 of this embodiment has a composite floor slab 4a. In Figure 8, the concrete 55, which will be described later, is shown by a dashed line.

[0050] The composite floor slab 4a comprises a first bottom steel plate (first metal structural member) 50A, a second bottom steel plate (second metal structural member) 50B, an erection piece 20, and concrete 55. The first bottom steel plate 50A and the second bottom steel plate 50B are formed in a flat plate shape from steel plates. The first bottom steel plate 50A and the second bottom steel plate 50B are butted together in the longitudinal direction Z. One side Z1 of the erection piece 20 is welded to the first bottom steel plate 50A. The other side Z2 of the erection piece 20 is welded to the second bottom steel plate 50B. In this example, the first insertion hole 23 is provided in the short direction Y on the side of the erection piece 20 opposite to the side of the first bottom steel plate 50A and the second bottom steel plate 50B (the side that is spaced apart from the first bottom steel plate 50A and the second bottom steel plate 50B).

[0051] The first bottom steel plate 50A and the second bottom steel plate 50B are connected to each other by a welded joint 51. The concrete 55 is positioned on the side of the erection piece 20 relative to the first bottom steel plate 50A and the second bottom steel plate 50B. The erection piece 20 is embedded in the concrete 55. The first bottom steel plate 50A, the second bottom steel plate 50B, the erection piece 20, and the concrete 55 constitute the composite floor slab 4a. Furthermore, the structure is not limited to composite floor slabs; it may also be a flat steel plate or the like.

[0052] As described above, in the structure 4 of this embodiment, the erection piece 20 is extended from the first bottom steel plate 50A to the second bottom steel plate 50B, and the erection piece 20 can also be used as a lifting device. The first metal structural member is the first bottom steel plate 50A, and the second metal structural member is the second bottom steel plate 50B. Therefore, the connection strength between the first bottom steel plate 50A and the second bottom steel plate 50B via the erection piece 20 can be increased for the structure 4 which comprises the first bottom steel plate 50A and the second bottom steel plate 50B that constitute the composite floor slab 4a. By inserting the lifting device 200 through the first insertion hole 23 of the erection piece 20, the first bottom steel plate 50A can be easily lifted via the erection piece 20. This allows the first bottom steel plate 50A to be securely connected to the second bottom steel plate 50B.

[0053] The first through-hole 23 is provided in the short-side direction Y on the side of the erection piece 20 opposite to the side of the first bottom steel plate 50A and the second bottom steel plate 50B. This makes it easy to lift the structure 4 by inserting the lifting device 200 of the crane 201 through the first through-hole 23, and to pull the structure 4 in the longitudinal direction Z and thickness direction X by inserting a wire or the like through the first through-hole 23. If the erection piece 20 has a second insertion hole in addition to the first insertion hole 23, the work can be done using the second insertion hole of the erection piece 20, eliminating the need to remove the lifting device 200 from the first insertion hole 23 of the erection piece 20.

[0054] Although the first to fourth embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications, combinations, deletions, etc., of the configurations are also included within the scope of the gist of this disclosure. Furthermore, it goes without saying that each of the configurations shown in each embodiment can be used in appropriate combinations. For example, in the first embodiment, the first structural steel 10A, the second structural steel 10B, and the erection piece 20 may be made of aluminum, an aluminum alloy, or stainless steel. The brace 30, leg 35, first base pipe 40 (first bent steel plate 41, second bent steel plate 42), second base pipe 45, first bottom steel plate 50A, and second bottom steel plate 50B in the second to fourth embodiments may also be made of aluminum, an aluminum alloy, or similar material.

[0055] (Note) (1) Embodiment 1 of the present disclosure is a structure comprising a first metal structural member, a second metal structural member, and an erection piece formed in the shape of a plate and having a first insertion hole through which a crane lifting device is inserted, and extending from the first metal structural member to the second metal structural member, wherein one side of the erection piece in the longitudinal direction is welded to the first metal structural member, and the other side of the erection piece is welded to the second metal structural member.

[0056] In this disclosure, the erection piece can be passed from a first metal structural member to a second metal structural member. By inserting a crane lifting device through the first insertion hole of the erection piece, the first metal structural member can be easily lifted via the erection piece, and the erection piece can also be used as another lifting device.

[0057] (2) Aspect 2 of the present disclosure may be the structure described in (1), wherein the structure is an offshore structure or a river structure. This disclosure describes a structure in which the connection strength between a first metal structural member and a second metal structural member via an erection piece is enhanced, and which can be used for marine or river applications.

[0058] (3) In aspect 3 of the present disclosure, the first through hole may be a structure as described in (1) or (2) provided on one side. In this disclosure, for example, when a lifting device is inserted through the first through-hole of the erection piece and the erection piece is lifted, the distance between the portion where the first metal structural member and the erection piece are welded and the first through-hole is shorter compared to the case where the first through-hole is located on the other side, thus reducing the stress acting on the welded portion.

[0059] (4) Embodiment 4 of the present disclosure may be the structure according to any one of (1) to (3), wherein the structure is a jacketed structure, the first metal structural member is a brace, and the second metal structural member is a leg. This disclosure describes how to increase the connection strength between a brace and a leg in a jacketed structure equipped with a brace and a leg, via an erection piece. By inserting a lifting device through the first insertion hole of the erection piece, the brace can be easily lifted via the erection piece, and then securely connected to the leg.

[0060] (5) Embodiment 5 of the present disclosure is the structure described in (4), wherein the width of the other side portion, along the shorter direction perpendicular to the thickness direction of the erection piece, is shorter than the width of the one side portion, along the shorter direction of the erection piece. In this disclosure, for example, even if the diameter of a portion of a leg, which is a second metal structural member welded to the other side of the erection piece, is larger than the diameter of a portion of a brace, which is a first metal structural member welded to the one side of the erection piece, portions of the leg and portions of the brace can be connected coaxially to each other.

[0061] (6) Embodiment 6 of the present disclosure is a structure according to any one of (1) to (5), wherein the structure is a monopile structure, the first metal structural member is a first pipe constituting the monopile structure, and the second metal structural member is a second pipe constituting the monopile structure. This disclosure describes how to increase the connection strength between the first and second pipes via an erection piece in a monopile structure comprising a first pipe and a second pipe.

[0062] (7) Embodiment 7 of the present disclosure is a structure according to any one of (1) to (5), wherein the structure is a monopile structure, the first metal structural member is a first bent steel plate constituting the base pipe of the monopile structure, and the second metal structural member is a second bent steel plate constituting the base pipe. This disclosure provides a monopile structure comprising a first bent steel plate and a second bent steel plate constituting a base pipe, which allows for increased connection strength between the first and second bent steel plates via an erection piece. Furthermore, by inserting a lifting device through the first insertion hole of the erection piece, the first bent steel plate can be easily lifted via the erection piece. This allows for secure connection of the first bent steel plate to the second bent steel plate.

[0063] (8) Aspect 8 of the present disclosure may be the structure described in (7), wherein the short direction perpendicular to the thickness direction of the erection piece is substantially along the normal direction of the first bent steel plate and the second bent steel plate, respectively. This disclosure enables the erection piece to be reliably transferred from the first bent steel sheet to the second bent steel sheet, and increases the bending strength of the erection piece around the axis along the thickness direction.

[0064] (9) Embodiment 9 of the present disclosure may be the structure according to any one of (1) to (8), wherein the other side portion is provided with a second through hole. In this disclosure, for example, when two erection pieces are welded to a structure after an erection piece has been welded to a second metal structural member, the structure can be suspended in a more stable state compared to when the structure is suspended by two lifting devices by inserting three lifting devices through three of the first and second through-holes provided in each of the two erection pieces.

[0065] (10) Embodiment 10 of the present disclosure is a structure according to any one of (1) to (9), wherein the first metal structural member is a first bottom steel plate constituting the composite floor slab of the structure, and the second metal structural member is a second bottom steel plate constituting the composite floor slab. This disclosure describes how to increase the connection strength between a first bottom steel plate and a second bottom steel plate via an erection piece in a structure comprising a first bottom steel plate and a second bottom steel plate constituting a composite floor slab. By inserting a lifting device through the first insertion hole of the erection piece, the first bottom steel plate can be easily lifted via the erection piece. This first bottom steel plate can then be reliably connected to the second bottom steel plate.

[0066] (11) Embodiment 11 of the present disclosure is a structure according to any one of (1) to (10), wherein the first through hole is provided on the side opposite to the side of the first bottom steel plate in the short direction perpendicular to the thickness direction of the erection piece. This disclosure makes it possible to easily perform rigging, in which a crane lifting device is inserted through the first insertion hole to lift a structure, and in this rigging, to easily pull the structure in the longitudinal and thickness directions by inserting a wire or the like through the first insertion hole.

[0067] (12) In aspect 12 of the present disclosure, the first metal structural member and the second metal structural member may be a structure according to any one of (1) to (11), including a shaped steel or a steel pipe. This disclosure shows that the first and second metal structural members can be constructed using commonly used materials such as shaped steel or steel pipes, while keeping manufacturing costs down.

[0068] (13) In aspect 13 of the present disclosure, the first through hole may be a structure according to any one of (2), (4) to (12) provided on the other side portion. This disclosure describes a method for lifting a structure by inserting a lifting device through a first insertion hole, which improves the maneuverability of the structure when pulling it in by inserting a wire or the like through the first insertion hole to move the structure. This method is particularly suitable when the structure is relatively light.

[0069] (14) Aspect 14 of the present disclosure may be the structure according to any one of (1) to (13), wherein the length of the longitudinal portion of the erection piece is longer than the length of the longitudinal portion of the other portion. In this disclosure, the length of one side of the erection piece that is welded to the first metal structural member is increased, so that one side of the erection piece can withstand greater stress.

[0070] (15) Aspect 15 of the present disclosure is a method for constructing a structure according to any one of (1) to (14), comprising: a first welding step of welding one side portion to the first metal structural member; a lifting step of lifting the erection piece with a crane using the first insertion hole; and a second welding step of welding the other side portion to the second metal structural member after the lifting step.

[0071] In this disclosure, in a first welding step, one side of the erection piece is welded to a first metal structural member, and in a lifting step, the erection piece is lifted by a crane using a first through hole. Then, in a second welding step, the other side of the erection piece is welded to a second metal structural member, thereby connecting the first and second metal structural members via the erection piece. [Explanation of symbols]

[0072] 1,2,3,4 structure 4a composite floor slab 10A First-grade steel (first metal structural member, shaped steel) 10B Second-type steel (Second-type metal structural member, shaped steel) 20 Erection Pieces 23 First insertion hole 24 Second insertion hole 30. Brace (First metal structural member, steel pipe) 35 Legs (Second metal structural member, steel pipe) 40. First pipe (first metal structural member, steel pipe, pipe) 41. First bent steel plate (first metal structural member) 42. Second bent steel plate (second metal structural member) 45. Second pipe (second metal structural member, steel pipe) 50A First bottom steel plate (first metal structural member) 50B Second bottom steel plate (second metal structural member) 200 Lifting equipment 201 Crane L1,L2 width S1 Construction Method (Method for constructing structures) S10 First welding step S11 Lifting Step S13 Second welding step X thickness direction Y-short direction Z-longitudinal direction Z1 One side Z2 The other side

Claims

1. First metal structural member, The second metal structural member, It is formed in a plate shape and has a first insertion hole through which a crane lifting device is inserted, and an erection piece extending from the first metal structural member to the second metal structural member, Equipped with, Of the erection piece, one portion in the longitudinal direction of the erection piece is welded to the first metal structural member. Of the erection piece, the other side of the erection piece is welded to the second metal structural member. A structure characterized by the following features.

2. The aforementioned structure is either an offshore structure or a river structure. The structure according to feature 1.

3. The first insertion hole is provided in the portion on one side, The structure according to feature 2.

4. The aforementioned structure is a jacket-type structure, The first metal structural member is a brace, The second metal structural member is a leg. The structure according to feature 3.

5. The width of the other side portion, along the shorter direction perpendicular to the thickness direction of the erection piece, is shorter than the width of the one side portion, along the shorter direction of the erection piece. The structure according to feature 4.

6. The aforementioned structure is a monopile structure, The first metal structural member is the first pipe constituting the monopile structure, The second metal structural member is a second pipe that constitutes the monopile structure. The structure according to feature 3.

7. The aforementioned structure is a monopile structure, The first metal structural member is a first bent steel plate that constitutes the base pipe of the monopile structure, The second metal structural member is the second bent steel plate that constitutes the base pipe. The structure according to feature 3.

8. The shorter direction perpendicular to the thickness direction of the erection piece substantially aligns with the normal direction of the first bent steel plate and the second bent steel plate, respectively. The structure according to feature 7.

9. A second insertion hole is provided in the other side portion. The structure according to feature 7.

10. The first metal structural member is a first bottom steel plate that constitutes the composite floor slab of the structure, The second metal structural member is the second bottom steel plate that constitutes the composite floor slab. The structure according to feature 3.

11. The first through hole is provided on the side opposite to the first bottom steel plate in the short direction perpendicular to the thickness direction of the erection piece. The structure according to feature 10.

12. The first metal structural member and the second metal structural member include shaped steel or steel pipes. A structure according to any one of claims 1 to 3.

13. The first insertion hole is provided in the other side portion, The structure according to feature 2.

14. The length of the longitudinal portion of the erection piece is longer than the length of the other portion of the longitudinal portion. A structure according to any one of claims 1 to 9.

15. A method for constructing a structure according to any one of claims 1 to 9, A first welding step involves welding the aforementioned portion on one side to the first metal structural member, A lifting step in which the erection piece is lifted by a crane using the first insertion hole, A second welding step is performed, in which the other side portion is welded to the second metal structural member, A method for constructing a structure, characterized by comprising the following:

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